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Патент USA US2025706

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Dec. 31, 1935.` -
Filed July 2a,` 1932
1.0 Sheets-Sheet 1
Dec. 31, 1935.
Filed July 28, 1932
lO'SheetS-Sheet 2 ’
Dec. 31, 1935;
2,025,706 ~
Filed July 28, 1932
1o sheets-snee?,` :s
’ Filed July 28, 1932
l0 Sheets-Sheet 4
Dec. 31, 1_935.
Filed July 28, 1932
1,0. Sheets-„Sheet 5
Dec. 31, 1935.
v 2,025,706
Filed July 28, 1952
10 Sheets-Sheet 6
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Dec. 31, 1935. -
Filed July> 28, 1932
` 10 sheets-sheet '7
Dec. 3l, 1935.
Filed July 28, 1952
10 Sheets-Sheet 8
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[email protected]
Dec. 31, 1935.
Filed'July 28, 1932
10 Sheets-Sheet 9
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Dec. 31, 1935.
Filed July 28, 1932
l0 Sheets-Sheet 10
[email protected]
Patented Dec. 31.21935 l
PTET gFritzlar.
Christian A. Birkebak, Detroit, Mich.. assignor to
EX-Cell-O Aircraft & Tool Corporation, Detroit,
L _
Mich., a corporation of Michigan
Application-July 28, 1932, Serial No. 625,293
17_ Claims.
mond boring machine embodying the features of
The invention relates to improvements in ma
chine tools and an important object of the inven
tion is to provide such a tool having a movable
tool orwork support and a work clamping 'iiX
Fig. 3 is a fragmental vertical sectional view 5
taken along the line 3--3 of Fig. 2 and showing
the work fixture in its closed relation with the
tuating means for the _movable support and the
clamping means of the fixtureoperable upon an
initial manual actuation of a control‘means to
work clamped therein.
clamp the work', actuate the movable support
Figm4 is a fragmental vertical sectional view
showing one of the work clamps in its released 10
10 through a work performing cycle and stop the
same upon completion of thecycle, and then _un
clamp the work.
in Fig. 1.
5 ture, together with automatically controlled ac
Fig. 2 is a plan View of the machine shown
Another object is to provide a machine tool
having a movable support> automatically actuated
15 through a working cycle and a work clamping
ñxture having a controlling action upon the
actuating means of the movable support.
taken substantially along the line 5_5 of Fig. 2
and showing the work fixture with its cover in
open position.
Fig. 6 is' a fragmental horizontal sectional view
taken substantially along the line 6_6 of Fig. 3 >
Another object is to provide a machine tool
with a movable support and a'new and improved
SD power operated work clamping device controlled .
and showing the work-locating ñngers in their
active positions.
Fig. 7 is a fragmental view similar to Fig. 6 20 _,
in its unclamping operation by the movement
and showing the locating fingers in their with
of the support.
drawn or inactive positions.
Fig. 5 is a fragmental vertical sectional view
Another object is to provide a machine tool
having a manually actuated member for starting
‘2.3 operation of the machine together with a latch
effective to prevent operation of the machine so
.. Fig. 8 is a fragmental perspective view of one
set of locating ñngers.
as_to requirethe operator to use both hands to
start the machine and thereby prevent injury to>
Fig. 9 is a fragmental Vertical sectional view >25I
taken substantially along the line 9--9 of Fig. 2.
Fig. 10 is a fragmental vertical sectional view
showing the details 0f the ejector pin trip mech
the operator.
anism,- the view’being taken substantially along
1 ' 30
Another object is tp provide a work ñxture the line lll-_l0 .of Fig. 2.
Fig._11 is a fragmental perspective view show- ~
embodying a clamping device and a work posi
tioning device operable to accurately locate a ing the cover of the work ñxture in a partially
work piece prior to the operation ofthe clamp ‘ open position and showing the ejectorpin trip
` ing device and to maintain the work piece in mechanism about to be released;
Fig. l2 is a’. fragmental vertical sectional viewl3.5_”
» this location until it has been clamped. '
Another object is to provide a work locating ' taken substantially along the line l2-I 2 of Fig. 5.
device operable to position a work piece, the - . Fig. 13- is a _horizontal sectional
device being arranged to engage a surface which view taken substantially along the line -I3--I3 of
'is to be operated upon‘by a tool, and adapted to Fig. 5 and showing the control` mechanism.
Fig. 14 is an enlarged vertical sectional viewy‘40'
45) be withdrawn from the work into a remote inop
erative position:
taken along the line I4-I4 ofFig. 13 and show
"' ' Another object is to provide a machine tool ing the cam `-for controlling the operation of the
embodying -a work ñxture with a guard extend
cover of the ñxture.
ing from the ñxture b'eyoiid'tiieftool and coop- '
Figs, 15 and 16 are sectional )views lsimilar to
Aerating with other _parts -oi' the machine frame
Fig. 14 which show the cams'for controlling the 45
to enclose the tool in all positions -ofV the mov- " operation of the locating iingers and the clamps.
able support,- the fixture being arranged to per
Fig. 1-'7 is asectional view taken along the line' '
mit insertion of the work laterally with respect ' |1--I1 of Fig. 13 and showing the switch operat
to'the path of 'movement ofthe support without
53 vexposing thetool or disturbing the guard.
' Other( objects and advantages will become ap
. connection with the'accompanying drawings, in
Figure 1 isa vfront elevational view of a dia
Fig. 18 is a diagrammatic view of the actuating 50
parent >from the followingI description _taken in
and control mechanism of the work ñxture.r `
Fig. 19 is a diagrammaticïview of the hydraulic
actuating and control circuits for the work table. `
While my invention is susceptible of embodi
ment in many different forms, I have' shown in 55
the drawings and will herein describe in detail
one such embodiment, with the understandingthat the present disclosure is to be considered as
March 17, 1932. Since the speed _change means
employed is not related to the present inven
tion, die disclosure herein has been simpliñed
an exempliñcation of the principles of the in- ` by eliminating the speed changing elements of
vention and is not intended to limit the inven
tion to the embodiment illustrated. Thef scope
of the invention will be pointed out in the ap
pended claims.
The machine in. general
'I‘he preferred form of the invention is herein
disclosed as embodied in a machine having an
' elongated bed >Ill with bridge-like tool supports
. II adjustably mounted at opposite ends thereon.
15 On the supports II, a plurality of tools I2 and
I 2a are respectively mounted so that work car
ried in a ñxture I3 on a longitudinally recipro
cable table I4 may be moved into operative re
lation with the tools on either yof the supports
20 II. The table I4 _is of elongated form supported
and guided on spaced longitudinally extending
. ways I5 (Fig. 5) on the bed I0, and in the form
shown the ends of the'table move beneath the
bridge-like tool supports II.
'I'he invention is illustrated in connection with
a diamond boring machine and the tools (Fig.
19) arev diamond iiy tools I2 and I2a carried by
rotatable spindles I 6 and I6a mounted on the
supports II, preferably with the spindles I6 and
IIìa in axial alinement so that the table I4 upon
movement in opposite directions may bring ‘the
workinto cooperative relation alternately wit
the tools I2 and I2ß.
A machine of this character is especially use
35 ful fin accurately boring the wrist pin holes of
engine pistons, the ends of connecting rods or
the hubs of gears. Accordingly, where rough
ing and iinishing operations are to be performed,
the tools I2 may be used as roughing tools and
~40 may be made of carboloy, while the tools I 2“
may constitute the finishing tools and are dia
and direction reversing elements thereof.
The hydraulic table-actuating motor may be of
any preferred type such as a cylinder rI9 (Figs.
3 and 5) ñxed to and extending longitudinally
beneath the table I4 and having therein a sta
tionary piston (not shown) supported on the
bed I0 by tubular piston rods 29 (Figs. 3 and 19)
extending’through the ends of the cylinder I9.
Opposite ends of the cylinder -I9 are connected,
through their piston rods 20, to two fluid con
duits 2I and 22 (Fig. 19) leading to a direction
valve 23.
The direction valve 23 (Fig. 19) may be of any
desired construction, and preferably comprises
an elongated cylindrical bore24 formed in a suit
able valve casing and having closed ends. A
valve piston 25 of the spool type is mounted for
reciprocation in the bore 24. Formed in the pe
ripheral wall of the valve bore 24 are two axially
spaced ports 26 and 21 (diagrammatically shown
in Fig. 19) connected respectively to the conduits
2I and 22. Two inlet ports 28 and 29, located
respectively beyond the ports 2B and 21, also y
communicate. with the valve bore 24 and are 30
constantly connected through a pressure iluid
supply conduit 30 to 'a suitable source of pres
sure ñuid such as a low pressure pump SI. In
termediate the ports 28 and 29, an exhaust port
32 is formed communicating with an -exhaust CJ Cal
conduit 33. The valve piston 25 is formed with
four longitudinally spaced peripheral collars or
heads 34, 35, 36 and 31 defining peripheral spaces
38, 39 and 40 through which communication be
tween various ports may be established.
It will be evident that‘upon movement of the
valve piston 25 to the left (Fig. 19) the space 40
In the present instance, three sets of axially will connect the ports 26 and> 29 to supply pres
alined spindles I6 and IIìa (Fig. 2) are provided sure ñuid to th'e conduit 2I leading to the left
mounted in separate tool supporting structures end _of the table cylinder, and the space 39 will 45
I1 secured on the supports II,- and work pieces connect the ports V21 and 32 and establish com
for one or more of the sets may be mounted in
munication, through conduit 22, between the
the fixture I3. In the present case, each set of right end of the table cylinder I9 and the ex
tools is adapted to operate on an engine piston haust conduit 33, thus instituting movement of
W (Figs. 4, 6 and 19) having two diametrically the_.table I4 to the left. -Reversal of the posi- 50'
alined wrist pin holes A to be bored, and the tion of the valve piston 25 similarly institutes
piston W is mounted in the fixture I3 inthe re
movement of the table to the right.
la tion shown diagrammaticaly in Fig. 19. Move
»An automatic reset pilot mechanism respon
munt of the table I4 to the left (Figs. 1 and 19)
sive to the movement of the table I4 is provided
cal'ses the tool I2 Vto take a roughing cut in both . for reversing' the direction valve 23. The p11ot55
holes A, and reverse movement of the table causes mechanism comprises two valves 4I and 42 for
the tool I2ß to take ai’inishing cut in both holes, effecting reversal of the table respectively to the
after which the work is returned to its centered left and right. The valves 4I and 42 respectively
position for removal from the ñxture I3.
comprise vertical valve bores 43 and 44 which
The spindle supporting structures I1 are all of may be formed in any suitable casings and which G0
similar construction and are adjustably secured in the present instance are- formed by valve plates
by means of transverse T-slots upon the top 45 ñx'ed on the front of the bed I0. Slidably dis
bridge-like supports II. Each structure I1 com
posed in the respective valve bores 43 and 44 lare
prises a housing which encloses a driving motor two valve plungers 46 and 41 of the spool-type
formed respectively with upper and lower periph- 65
and suitable spindle bearings (not shown). '
eral collars or heads 48 and 49, and 50 and 5I de
The tableactuating means f
fining annular spaces 49a and 5.011. The upper
Thetable I4 is preferably actuated and con
ends of the bores 43 and- 44 are constantly in
trolled by automatic means providing for speed communication with a branched conduit 52
changes, direction reversal, and stopping of the adapted to be connected through a stop valve 53
table. This means may be of any preferred type either to the source of pressure ñuid or the ex
and construction, but as herein shown, it is hy
draulic in character substantially similar to that
>The spaces 49a and 50a, regardless of the po
disclosed and claimed in a copending application -sitions of the plungers 46 and 41, are always in`
'by Carroll R. Alden, Serial No. 599,427 ñled communication vwith- the drain- through an ex-"75
mond ñy tools.
the table-actuating and control means andl con
?lning the description to the starting, stopping .
haust conduit 54 which is controlled by the valve
53. A cross conduit 55 opens at oneend to the
bottom of theßbore 43, and at the other end to
the side of the bore 44 adjacent the top for con
nection through movement- of the head 58 either
with the supply conduit 52 or the exhaust con
duit 54. Likewise, a cross conduit 56 opens atone end to the bottom of the bore 44 and at the
other end to the side of the bore 43 adjacent the
plunger 53 'are four longitudinally spaced periph-`
eral collars or heads 62, 63, 64 and 65 .which
deñne annular spaces 66, 61 and 68. The plunger
53 thus constitutes a- differential piston which
whensubjected at both ends to the same pressure
tends to assume its uppermost position.
The supply' conduit 38 is connected through
three parallel branch conduits 69, 18, and 1I to
the bore 68 respectvely at the upper and lower
top thereof for communicationv through move p ends and at an intermediate point. Interposed
ment of the head 48` either with the supply con
_in the lower branch conduit 10 isa restricted
duit 52 or the exhaust conduit 54. The cross con
oriiice 10a. The exhaust conduit 54 is connected
duits 55 and 56 also open respectively to the'left through twó' parallel branch> conduits 12 and 13
‘ and right hand ends of the direction valve bore to the bore 68 at spaced points intermediate the
conduits 69, 18 and 1I. A back pressure valve 14a
The bores 43 and 44 preferably open upwardly is interposed in the discharge end of the system
' through the plates 45 and are closed aty their ahead of the exhaust conduit 54 and back of the
lower ends, and the upper ends, of the plungers> direction valve 23. The pressure conduit 52 for
46 and 41 extend slidably from the upper .ends the pilot reset valves 4I and 42 is connected to
20 of the `valve bores. It will be evident that-*thel the bore 60 at a point such that ywhen the plunger 20y
lower ends of the plungers 46 and 41 _constitute 53 is in its uppermost position-'communication
differential pistons which will assume their up- '
permost positions when subjected to fluid pres
`sure at both ends. The exposed upper ends of
the plungers 46 and 41 are beveled to constitute
reversing abutments adapted for engagement by
suitable control Adogs 51> and 58 with inclined
faces mounted on the front of the work table I4.
The location andspacing of the‘dogs 51 and 58
30 on the table I4 is dependent upon the desired
extent and range of reciprocation.
Assuming that the stop valve 53 is adjusted to
connect the supply conduit 52 to the source of
-will be established therewith through the space
61 tothe main -supply conduit 38, and when the
plunger is partially depressed, such communica
tion will be'cut 01T. Obviously, fullyY lowering the 25
plunger 53 will connect the conduit- 52 through
th'e space 66 with the exhaust conduit 54, and will
therefore _cause the ends of the main valve 23
to be connected with the drain conduit 33.
Pressure responsive means is provided for au-l
tomatically centering lthe valve piston 25 when
the occasion arises.
This means comprises two
centering pins 'I4`and 15 slidably disposed respec
pressure fluidj'and that the right hand plunger tively in bores 16'and 11 alined with and atV op
`41 is in its uppermost position, pressure ñuid from ' poslte ends of the bore 44 and adapted to engage
theconduit 52Ywill be transmitted through the the ends of 'the direction valve piston 25 when
upper end of the valve bore 43 and the cross urged inwardly. The outer ends of the bores 16
conduit 56 to the lower end of thevalve bore 44 and 11v are-connected to a branched conduit 18
and also to the right hand end of the- direction which opens to the bore 68 above the conduit 13
40 valve bore 24; and the lower end of the valve
and atfsuch. a point that 'it will communicate
bore 43 and the left end of the direction valve through the space 68 with the exhaust conduit
bore 44 will be connected through the cross con
54 when the plunger 53 is elevated, and through
duit 55 and the space 4!)a to the exhaust conduit > the space 61 lwith the supply- conduit 30 when the
54 and thence to the drain 33. Hence, the plung
plunger 53 is depressed, Itwillbe evident that
er 46 will occupy its lowermost position, andthe -' when the stop valve plunger 53 is depressed to
-direction valve piston 25 will be moved'to the connect both ends- of the-main valve bore v24 to
left to cause the table I4 to travel to the left.
the exhaust conduit 54, and simultaneously to
As the table I4 reaches its extreme left position, connect the conduit'lß to the supply conduit. 38,
the dog 58 depresses the plunger 41, thereby the impressed pressure ñuid in'the bores16 and
breaking the exhaust connection from the lower 11 will force the centering pistons 14 and 15 into
-end of the valve bore 44 and establishing a con
_their innermost positions, thus causing self
nection therefrom to the ypressure conduit 52. centering of the main valve piston 25 to interrupt
Thereupon the plunger 46 is elevated into op
the conduit connections to the'table cylinder I9.
erative position, thereby breaking the pressure
Downward movement of> the stop plunger 53'
connection to the lower end of the bore 44 and may be effected-at will by' means of a manual
the right hand end of the direction valve bore 24, I control which in the present instance consists of
and establishing a connection therefrom to the a' valve 88 (Figs. v1, 3, 5 and 19) .K Preferably the
exhaust. As a result, the direction valve >piston valve 80 comprises a casing _8| fitted in a recess
25 is moved to the right to reverse the movement , in the front ofthe bed I8 and having an axial
ofthe table I4. Upon'movement of the table I4
to its extreme right position, the dog 51 depresses
the plunger 46, thereby reestablishing the initial
connections and resetting the plunger 41 in- its
uppermost position.
The stop valve 53 (Figs. 5 and 19)»isloperable
either automatically or manually to interrupt the
Ptranslation of the work table I4, and in. its pre
ferred form comprises a valve b_ore or chamber 68
vertically positioned and formed in a plate 6I
valve bore 82.> The bore 82 is connected atits 60
-inner- end te the pressure conduit 52, and is
formed >at »points spaced along its length withannular ports 83 and 84 connected -respectively
to the exhaust conduit 33 and a conduit 85 open-`
ing into the lower end of the-bore 69 beneath the 65
stop valve plunger 53. .-The valve‘88 is slidably
mounted in the bore 82 with its stem projecting
forwardly from the base. Within the bore 82, the
valve plunger 88 is formed with a peripheral space
which' may be fixed on the rearA side of the bed I8,
86B. adapted either to connect or disconnect the
the bore 60 being _closed at the bottom' and being ` conduits 85 and 33. 'Obviously upon actuating
I ’ open at 'its upper end to permit the upper end of , the valve 88 to connect the yconduits 85 and 33,
the valve plunger 53 to project therefrom. The
valve plunger 53 is of the spool-:typev and is re
"exhaust, and due to the orifice 10a, a substantial
` ciprocably disposed _in the bore 60. On the
pressure reduction will occur beneathI the stop
the lower end of the bore 68 will be opened to the
plunger 53, thereby causing the latter to descend
and guard the spindles and tools in all positions
to stop the work table I4. Upon actuating the
valve 80 in the opposite direction, the pressure
iiuid will again be admitted to the underside of
the stop valve plunger 53 thus causing the latter
to return upwardly to its operative position and
thereby .instituting movementl of the table as de
termined by the setting of the direction valve 23.
Where a roughing cut and a finishing cut are
to be taken upon movement of the work table
I4 in opposite directions, it is desirable to pro
vide meansV for automatically stopping the table
upon movement thereof after the finishing cut
`of the table. The guards 95 in the present case
extend over the tops of the spindle mounting
structures I1 vand are -of course optional.
The work fixture I3 comprises a hollow base 5
section 96 fixed on the table I4 and recessed
from the top to receive three work pieces such
as pistons W, one- between each of the three
alined pairs of tools I2 and |29“, and a movable
into a central or neutral position.
This means
(Figs. 5 and 19) comprises> a pivotal drop ’pawl
-or dog- 86 movable with the work table I4 and
adapted to engage the upper beveled end of the
stop plunger 53. 'I‘he dog 86 is pivotally mounted
. on the rear edge of the table I4 and a forwardly
projecting pin V81 carried on a mounting plate 88
is' adapted for engagement in a slot 89 formed
in one side of the dog 86 to limit pivotal move
ment of the dog in one direction.
In vmovement of the table I4 to the right,
(Fig. 19), the dog` 96 pivots away from the pin 81
upon contact with the plunger 53 so that the
plunger is not depressed by such engagement,
but upon movement of the table |4 to the' left
into the neutral or loading position, the dog will
30 pivot toward the pin 81 and will thus be effective
to depress the stop plunger. The’stop plunger
53 is not depressed into its lowermost position
or sufl'iciently to release the dog 86, although the
section or cover 91 on the base section 96 shift- 10
able about -a horizontal pivotal axis to close the
top of the recesses. While the cover 91 is in its
open position (Figs. 5 and 12), the pistons W are
inserted into sockets or seats provided by sleeves
98 and bottom plates 99 mounted within the base l5
96, and thebearings A of the pistons W are ap
proximately alined with the tools I2 and I2ß and
with openings |00 and |0| formed in the sides of
the hollow base 96 and in the sleeves 98.
' The cover 91 is then closed to bring pivoted 2O
clamping bars _ |02 carried thereby into contact
with the- uppermost edges of the skirts of the
pistons W. Two such clamping bars |02 are pro
vided for each of theypistons W (Figs. 5 and 9).
Each bar |02 is pivoted at |03» on a horizontal 25
_axis and is yieldingly pressed toward the work
pieces by springs |04, (Fig. 9). Thus, the pis
tons` W are clamped by a yielding pressure against
the bottom plate 99, the vertical position of the
pistons being accurately determined by upstand- 3()
ing pins 99a on the bottom plate and engaging
the closed ends of the pistons.
While thus clamped, the pistons W may be
slight pivotal movement permitted by the pin
rotated about a vertical axis to bring the bear
ings A into accurate alinement with the tools, 35
to be located to the right (Fig. 19) of the pivotal and such rotation of the pistons is accomplished
center of the dog. To again institute operation by shiftable locating fingers |05. Two such lo
of the table I4, as for a succeeding cycle, the cating fingers |05 are provided for each piston W,
control valve 80 is actuated, either manually. and they preferably are adapted to act upon the
35 81 causes the center of` gravity of the dog 86
40 or automatically, to connect the conduits 85 and
33, thereby causing the plunger 53 to drop to its
lowermost position. f The dog 86 is thereby re
leased and drops to the left (Fig. 19) so as to
clear the path for proper movement of the stop
plunger 53. The stop plunger 53 however re
mains in its lowermost or table-setting position
until the control valve 80 is again withdrawn
to its outermost position, whereupon the in
creased pressure in the lower end of the valve
bore 60 elevates the plunger 53 and permits the
feeding of the table I4 to the left as determined
by the position of the direction valve 23.
internal surfaces of the bearings A. In opera- 40
tion, the two locating ñngers |05 are moved
axially into the bearings A, and are then moved
transversely of the longitudinal axis of the bear
ings until both locating fingers- are in contact
with corresponding internal surfaces of the bear- 45
ings. _The operative contact surfaces or ends
|059L of the two locating fingers of each pair are
maintained at all times in a parallel relation to
the tools I2 and I2a so that such movement of
the fingers into contact with. the corresponding 50
internal surfaces of the bearings A serves to ro
tate the pistonW into the desired angular rela
To provide for convenient manual actuation ' tion to the tools.
of the control plunger 80, a horizontal rock shaft
' In the present case, the locating fingers |05 of
each pair bear a .scissors-like relation to each 55_
other to provide for movement of the ends |05’I
’thereof into the bearings A, and are carried on a
located pin thereon (not shown) engaging 'a slide block |06 (see Figs. 6 to. 8) mounted for hori
grooved head 93 on the valve plunger» 80. At zontal movement in the base 96 transversely of
the axis of the'tools. Intermediate their ends, C0
60 its ends, the rock shaft 90 carries hand levers 9
the locating fingers |05 are pivoted at I 01 on ver
for manually actuating the‘shaft. v
tical .aXes on the slide block |06. By movement
of the locating fingers about the pivots |01, the
The machine is preferably arranged so that ends |05a may be moved toward and away from
the work is inserted into the fixture I3 laterally each other so as to permit the fingers to be moved C5. ‘
with- respect to the path of movement of the into the bearings A of the pistons. Such pivotal
table I4, in the present instancejfrom the top of movement of the locating fingers |05 is obtained
automatically in the reciprocatory movement of
the fixture. With such an arrangement, the dis
tance between the tools I2 and IZB'may be but the slide block |06-by means‘of cam rollers |08
slightly greater than the width of >the work (Fig. mounted on the other ends of thelocating fingers 70
|05, and engaging cam grooves |09 formed in /
19) whereby to reduce the length of the stroke
required for the table I4. It also permits the blocks ||0 secured in the base 96 (Fig. 6). As will
mounting of guards 95 (Figs. 1, 2, 9 and 12) on ' be evident from a comparison of Figs. 6 and '1,
m-ovement of the slide block |08 from the position
the sides of the-fixture I3 so as to extend along
the tool spindles I6 and I6a to completely cover shown in Fig. 7 to 'the position shown in Fig. `6 75
90 is mounted. in brackets 9| on the forward side
of the bed I0 and a lever 92 fixed on the rock
shaft 90 intermediate its ends has an eccentrically
moves the rollers |08 through angular portions
any binding action between the pistons W and the
|098L of the camv grooves |09 so as to pivot the sleeves 98 is overcome so that the pistons may be
fingers |05 and shift the ends |05at thereof toward ' easily removed, and the pins |26- are retracted to
each other and into the bearings A. Continued permit insertion of new work pieces.
movement engages the ends |05a with the sides
The ratchet connection between the cover 91 5
of the bearingsA and accurately alines the same and the ejector pins |26 includes an arm |33
with the tools. In the withdrawing movement, (Figs. 1, 2, 3, 5, »9, 10, 11 and 18) formed with a hub
the locating fingers |05 are separated so-as to
|34 at one end, the hub being rotatably mounted
avoid shifting or displacement of the pistons W. on the`forward end of a rock shaft |35 journaled
Extending slidably through all three of the in the base section 96 and-upon which the cover 10
slide blocks |06 isa longitudinally shiftable hori 91 is fixed. A bolt |36, upon which the springzontal rod | || (Figs. 5 and 6 to 9) through which |3| is anchored, serves to hold the hub. |34 in
the three sets of locating lingers |05 are actuated place on the shaft |35. Pivoted intermediate its
. in unison.
Movement of the rod ||| tending to
ends at |31 in a lug |38 on the cover 91 is a lever "
15 shift the locating fingers |05 to their active posi
or pawl I 39 which extends lengthwise of the shaft 15
|35 so, that its forward end is positioned beside
the hub |34. A spring |40 actingbetween the
shaft |35 and the other end of the pawl |39
presses the forward end of the pawl against the
hub |36 so that it will engage a radially projecting 20
lug or tooth |4| formed on the hub. Thus, in ro
tions is transmitted yieldingly to the slide blocks
|06 by coil springs H2 surrounding the rod and
acting between the blocks |00 and collars | | 3
fixed on the rod. In the reverse movement of the
20 rod H |, the slide blocks |06 are shifted positively
by engagement with the collars | I3. _
While held in accurately determined positions
by the locating fingers |'0 5, the pistons W are se-‘
tation of the shaft |35 to> open the cover 91, the `
pawl |39 engages the tooth |4| >and rotates the
hub |34 and its associated arm |33, which
cured in place by clamps H5, which preferably
comprise clamping leversl I6 and H1 (Fig. 4) car
ried by the cover 91 and extending downwardly
»within the skirts >of the pistons W.` Each lever
through alink |42, connected to the arm |32, actu- 25
ates the ejector pins |26.
A guide member’ |43 ñxedto the shaft |35
H6 is pivoted at H8‘i intermediate its ends in a
slot H8 formed in the cover_91 so that one end
30 I | 6a projects downwardly into the skirt of the pis
ton W and constitutes the clamping end while
adjacent to the hub |34 has a radial slot |44
therein which embraces and guides the pawl |39
for movement radially out of engagement with 30
the tooth |4|. . Such disengagement of the pawl
the other end | I6b extends upwardly through the
cover and constitutes the actuating end. The
lever I |1 is also pivoted in the slot | I8 and extends
from the cover into the piston >W. Movement of
|39 is caused by a stationary cam plate |45.
(Figs. 10 and 11) fixed on the base section 96 and
loosely surrounding the shaft |35 just rearwardly
of the guide member |43. The cam plate- |45 pro- 35
vides a cam surface |46 with which the `‘forward
' the lever H1 is obtained by‘means of a yieldable
lost motion connection | I9 between the lever H1
and an arm |20 on the lever H6. '
portion of the pawl |39 engages‘in the opening
_ movement o_f the cover
The slope of the
Mounted on the outside of the cover- 91 in bear
cam- vsurface |46 is such 'that the pawl |39 is dis
40 ings |22 for longitudinal sliding movement from. "engaged from the tooth |4| just prior to the com- 40
front to rear of the fixture is a rod |2| (Figs. 2' pletion of- the cover-opening movement. The
and 3) for simultaneously actuating the three Aspring |3| then causes reverse rotation of the
clamps H5. The ends H6b of the clamp levers arms |32 and |33 so as to withdraw the ejector .
H6 are bifurcated so as to straddle therod |2| 'pins- |26 and return the arm |33 .to the position
between sets of two fixed collars |23 and |23“, J`shown in Fig. 1. In this position of thek arm 45The collars |23 engage the levers H6 and in the |33, the pawl |39 is positioned radially’outwardly
rearward movement of the rod |2| serve to effect of a surface |41 (Fig. 11) formed on the tooth
positive release of the clamps. In the opposite. | 4| concentric with the shaft |35 so that the pawl
or clamping movement of the rod, actuation of may bear against the surface |41- in- the returnA '
the clamps is yieldable in character by reason of or closing movement of the cover 91. Just before V5o
springs |25 coiled about the rod and actingbe
the closing movement of the- cover is completedtween ñxed collars |23a and the collars |24 which Vthe pawl |39 passes they end of >the surface |41
are slidable on the rod |2I. `
and is forced inwardly against the hub |34 in
After lthe work upon the pistons W has been position to engage the tooth |4| in the'subsequent f
55 completed, and the' clamps H5 released andthe
opening'of the cover.
cover 91 opened, the pistons are moved upwardly
in the sleeves 98 by work ejector -pins |26 (Fig. 9), f
two of which may be moved upwardly through
suitable openings in each of the bottom plates 99.
60 The work ejecting pins |26 of each pair are mount
ed on a block |21, and the blocks I 21 are actuated
in unison through pin and slot connections |30
by arms |28 ñxed on a rock shaft |29.
The ejec
tor pins |26 are normally withdrawn downwardly
65 '
into inoperative position by’a spring |3|acting
V between a stationary part of the,structure and an
arm |32 (Figs. 1 ande) ñxed on the forward end
of the shaft |29.
In the present embodiment, the ejector pins
The fixture actuating means
` The cover 91 with its associated clamp >bars-
|02 and the ejector pins |26. the locating fingers '
|05 and the clamps H5 are preferably actuated 60
in predetermined sequence by automatically
operating power means.
The actuating means
»~ maybe of any preferred construction but in the -
present case it is hydraulic in character and com
prises three double-acting piston> and cylinder 65
devices |50, |5| and |52 connected respectively
to thecover 91, the locating fingers |05 and the
The piston and-cylinder device |50 (Figs. -1, 2,
|26 are actuated as an incident to the opening 3, 5, 12 and 18) which operates the cover 91, the 70
movement of the cover 91, such actuation being -'clamping bars |02 carried by the cover and the` .
lobtained through a ratchet connection which re
ejector vpins |26, is mounted at the rear end of
leases the pins for retractive movement by the the base 96 of the fixture, and comprises a sta
spring |3| after the pistons W have been raised l tionary vertically positioned cylinder’ |50a having _
an appreciable distance in the sleeves 98. Thus a movable piston |50b therein with an associated 75
vertical piston rod >|53 _extending upwardly
through the top end wall of the cylinder |508.
On its projecting end, the piston rod |53 carries
a rack |54 mounted for sliding movement in a
guide |55 which holds the rack in engagement
with a pinion |56. The pinion |56 is keyed to the
horizontal rock shaft |35 upon which the cover
91 is ñxed. Thus rocking movement of the shaft
|35 through the medium of the piston and-cylin
10 der device |50 serves to open or close the cover
91, and, as an incident to'such movement to actu
ate the clamping bars |02 and the ejector pins
tion with the space |12 so that reversal of the
position of the valve member |66 reverses the
pressure and exhaust connections to the ports
|63a and |63".
As shown in Fig. 18, the port, |63a is connected
by a conduit |16 to the upper end of the cylinder
|562L while the port ~|63b is connected by a con
duit |11 to the lower end of the cylinder.' Simi
lar conduits |18 and |19 connect ports '|649 and
|64b respectively with the forward and rear ends
of the cylinder |5|-°~ which is employed to actuate
the locating fingers |05. Conduits |80 and |8|
communicating with ports |65a and |65b are _con
The piston and cylinder device |5| (Figs.’1, 3,
5, 6, 'l and 18) for actuating the locating ñngers
|05 is positioned at the forward end of the ñx
ture I3 and comprises a stationary cylinder |5|a
nected respectively tothe rear and front ends of
the cylinder |52,a which actuates the clamps ||5.
The valve members |66, |61 and |68 areac
fixed in a horizontal position on the base section
tuated in predetermined timed sequence by
means comprising a plurality of disk cams | 82,
96 in alinement with the actuating rod ||| of the
|83 and |84 ñxed on a rotatable control vor cam
20 locating fingers. Within the cylinder |5|a is a shaft |85 mounted in a horizontal position with 20
slidable piston |5|b with an associated piston rod in alhousing |86 which constitutes a continua-_
|51 connected at |58 to the rod ||| for recipro- ` tion of the valve casing |62. The valve members
|66, |61 and |68 have rollers |81 thereon adapted
' cating -the same.
The piston and cylinder device |52 (Figs. 1 to 4to engage the corresponding cam disks. The
25 5_and 18) for actuating the clamps | I5 is carried rollers are heldin engagement with the cam disks
by the cover 91 >and comprises a cylinder |526
ñxed on the forward end of the cover. Within
the cylinder |52a is a slidable piston |52b attached
to the rod |2|L Thus, the rod |2| may be recipro
80 cated by the piston and cylinder device |52 to
an electric motor |89 through a belt |90 and
pulleys |9| and |92 connected to an enclosed 30
speed reducing gear train |93 (Fig. 13), the ter
actuate the clamps ||5.
The interrelated automatic eontmz of the fatturev
>(md the table
by expansive springs |88 mounted in' the valve
casing |62 and acting against the valve members.
The control shaft |85 is preferably actuated by
minal gear |94 of which is fixed on the control
The cams |82; |83 and | 84 are so related and
i The various elements of `the Work fixture are proportioned that _in rotation of the control shaft 35
preferably operatedy in predetermined timed se . |85 through substantially 270° in a' counter- `
quence by suitable control means, and in they clockwise direction from the positions shown in
Figs. 14 to 16, the operative elements of the work .
present embodiment of the invention the opera
fixture are caused to move through a work clamp
- tion of the work fixture control means is interre
ing cycle, while rotation of the control shaft
40 means to provide for a fully automatic manually Ä through an additional 90° back to the position
of. Figs. 14 to 16 causes the unclamping operation
. initiated cycle of operation. Thus, an initial
. `
vmanual actuation of a control element after the of the elements of the fixture.
When the control shaft |85 is in the position of
work pieces W have been placed in the ñxture
causes an automatic operation of the machine,Y Figs. 14 to 17, the rollers |81 of the three valve 45
,in which operation the cover of -the fixture is members |66, |61 and |68 engage concentric>
closed, the work accurately located and clamped, dWe.l surfaces |95, |96 andO |91 formed respec
tively on the cams |82, |83 and |84, süch engage
the table moved through its automatic work per
forming cycle and the cover opened and the work ment being at points indicated by the letter B in
50 unclamped and ejected after the table movement
Figs. 14, 15 and 16. When in this relation to their «
has been automatically terminated.
cams, the valve members are moved by the
With this end in view, a control device |60 ' springs |88 tothe left as shown in Fig. 14, so as
(Figs. 2, 3, 5, 13 and 18) is mounted on the rear to connect the- spaces |12 with the pressure fluid
end óf the base 96 of the work fixture.' -The inlet ports |1'4"and the spaces |13 .with the ex
haust ports |15. The cover 91 is therefore in
55 4control device |60 comprises a six-Way valve |6|
(Figs. 2, 13 and 14) for controlling the passage its open position, the clamps ||5 in their un
- ofÍ pressure fluid to and from the three piston
and cylinder devices |50, |5| and |52. The valve
|6| comprises a casing |62 vwith three parallel
60 bores |63, |64 and |65 and valve members |66,
_.I 61 and |68 ofr the spool-type reciprocable therein.
Each of the three valve members> has three spaced
clamped relation, and the locating fingers |05 in
the withdrawn relation of Fig. 7.
Upon initiation of the clamping cycle of the'
control shaft |85, the rollers |81 of the valves
|61 and |68 continue to bear against the con
centric dwell surfaces |96 and |91 (Figs. 15 and
heads |69, |10 and |1| defining peripheral spaces
16) while a leading surface |98 on the cam |82
, -|12 and |13. In one position, the space |12 com
65 municates with a pressurel inlet port |14 formed
moves into contact with the associated roller |81
andshifts the valve |66 to the right as shown in
Fig. 14.v This reverses the position of the'valve
~in the casing |62, while thespace |13 communi
cateswith one of two ports |15i of a branched
exhaust passage |15ß. The pressure inlet port
|14 .may be supplied with _pressure fluid' from
l70 the supply pump 3| of the table actuating means.
Each of the valve bores |63, |64 and |65 has a ’ .
pair of longitudinally spaced ports similar to ports
is constantly incommunication` with the space |13
while the’port |63b isconstantly in communica
|66and hence reverses the pressure and exhaust
connections to the cover actuatingf piston and
cylinder device |50 so as to cause closing move
ment of the cover 91. l Ä
Whentherotative movement of the control
shaft |85 has engaged the various cams with
their rollers `at points C, the clamping- movement n
of the- cover 91 has been completed and the roller
|61 of the valve |66 is engaged with a concentric 75
dwell surface |99 which maintains the valve |66
in its reversed right hand position (Fig. 14) so
that the cover 91 is held in its closed position.
In continued rotative movement of 4the control
shaft |85 to bring the points D of the cams into
contact with the Various rollers I 81, the positions
of the valves |66 and |68 remain unchanged since
their rollers |81 bear against the concentric dwell
surfaces |99 and |91. The valve |61 however, is
10 reversed during such movement of the control
shaft by a leading surface 200 formed on the
cam |83 intermediate the points C and D. 'Hence
the locating fingers |05 are moved to their active
parallel circuits constitutes a'starting circuit for
the motor and includes conductors 2| 4, 2I5 and
2I6 with a normally open switch 2| 1 therein.
The switch 2I1 is of the push button type, and
is mounted on the forward face of the' right hand
~tool support II. The other' of the two parallel
circuits in the line 2|2 comprises the conductor
2I6, and conductors 2|8, 2I9 and 220, and con
stitutes a running circuit for the motor. In the
running circuit, is a switch 22| mounted in a suit
able box 222 on the control device |60 (Figs. 3,>
1'7 and 1S). The switch 22| is actuated by a ver
tically movable plunger 223 (Fig. 17) connected
positions of Fig. 6. At‘the point D (Fig. 15) the
to an actuating arm 224v of the switch.
leading surface 208 on the cam |83 merges with
a concentric dwe-il surface 20| which, during con
tinued rotation of the shaft |85, maintains the
valve I 61 in its right hand position so as to cause
225 surrounding the plunger tends to urgethe
switch 22| into its open position, and to >maintain
the positioning ñngers to remain in their active
trol shaft I85 is in the position shown in Figs.
relation to the work.
I4 to I8, the plunger 223 is positionedwithitsupper 20
A spring
the plunger in contact with a cam disk.226 op
erable by the control shaft |85.
When the con
While the dwell surfaces |99 and 20| maintain « end in a notch 221 in the cam 226 so that switchl `
22| is open. When the work clamping cycle. of '
' _ the valves |66 and |61 in their right hand po
sitions, continued rotation of the control shaft
I65-brings a leading surface 203 on the cam |84~
(Fig. 16) into contact With'the associated roller
|81 so as to reverse the position of the valve |68
and cause movement of the clamps II5 to their
active work-clamping positions. The roller |81
ofthe valve |68 then engages a dwell surface
the control shaft |85 is initiated by closing the
starting switch 2|1, the cam 226 is rotated and
a leading surface 228 vthereon engages the plunger 25
223 to compress the spring 225 and thereby close
the switch 22|. A concentric dwell surface 229
on the cam 226 is then moved into contact with
the end of the plunger 223 to maintain the switch
204 at the point E and maintains `the valve |68
in its reversed position.
in its closed position.
To break the running circuit of the motor and
As the control shaft E continues to rotate ay thereby stop rotation of .the control shaft |85
receding surfacev285, formed on the cam |83 upon completionof its clamping cycle, a second
(Fig. 15) between the points E and F and con
switch` 230 is provided between the conductors
necting the dwell surfaces |96 and 20|, permits 2|8 and 2I9. The switch 238 is automatically 35
the valve |61 to be returned to its left hand po-` controlled by movement of the table I4, a pivoted
sition by the associated spring |88 so as to-re
ldog 231 (Figs. 3, 5, 12, and 18) being mounted
store the original pressure and exhaust connec
on the rear edge of the table to engage a pivoted
tions ito the piston and cylinder device |5I and _ operating arm 232 of the switch 230. The arm
40 »thereby cause withdrawal of the locating fingers ' . 232 is located outside of a box 233 which encloses et()l
|05. During such withdrawal of the locating ` lthe switch 230 and is mounted on a fixed bracket
lingers the valves |66 and |68 are held in their 234 carried on the rear side of the bed I0 as shown
reversed positions by the dwell surfaces |99 and
in Figs.l 3 and 12.> The switch 230 Iis spring
204 so as to maintain the cover`91 in its closed
pressed in a conventional manner (not shown)
' position and the clamps I I5 in their active rela- >
toward a normal cpen‘ position-which tends to 45 l
«tion to the work. When the cams have' been
rotated by the controlshaft |85 so as to engage
the rollers |81 at the points G, the clamping cycle
of the fixture has been completed and the rota
tion of the control shaft is stopped.
' In the unclamping cycle of the control shaft
|85, the dwell surface |99 on the cam |82 holds
raise the end of the arm 232 into the path of the
dog 23|. When the `table I4 is in itsocentral or
loading position (Figs. 1 and 12) as determined
the -vaflve |66 in its reversed >or right hand posi-7
_tjonwhile a receding surface 201, formed on the
by the stop dog 86, the dog 23| engages' the switch
operating arm 232 and holds the switch 238 closed 50
'so that closure of the other switch 22| serves to
complete the running circuit to the motor |89.
Upon movement of the table I4 and the associ
ated dog 23|, the arm 232 is‘ released and the
cam |84 intermediate the points G and H and » . switch
_connecting the dwell surfaces |91 and 204, per
mits the valve v|68 to resume its original position
and thereby .cause releasing movement of the
clamps II5. A receding surface 208 formed on
60 the cam |82 between the points H and B then
p_ermits the valve |66 to move to the left andv
cause opening of the cover 91' and actuation of
the ejector pins |26,
-Rotation of the control shaft |85 is started~
and stopped by making, and breaking an electric
circuit to the motor |89, and over-_running of
the shaft |85 is prevented by a spring actuated
brake leverv 2|!) (Fig. 13) bearing against the
internal surface of a ñange 2|| formed on the
2,30 opens, thereby causing’the control 55
shaft |85 to stop. When the roughing operation
has been completed and the table. returns and »
passes its central position, the dog 23| engages
the lever 232 and is pivoted away from a~ stop pin
235 _so as to be‘ineffective as a switch closing 60
means. After the finishing operation has been
completed, the table returns to its centraljpo'si
tion from the opposite direction and the dog 23|
engages the switch operating arm ‘232 and is
moved into contact with the stop pin 235. The 65
dog 23| therefore serves to depress the lever arm
232 and closes the switch 230. The running cir
cuit` to the motor is thereby reestablished and the
control shaft moves through its unclamping cycle ,
`which is terminated by movement of the `switch 70
In the present embodiment, power' is supplied plunger 223 into the notch 221 in the cam. disk
pulley |92.
to the motor |89 from power lines 2|2 and.2|3. -
'I'he power line 2I3 is connected directly to the
In order that the switch 238 may be opened
` motor while theipower line 2|2 has two parallel and the clamping cycle terminated at the proper
control circuits interposed therein. One of these . point in the rotation of» the control shaft |85, the 7E -
initiation of the table movement preferably is
governed by the control shaft |85. This end is
arm 252 is connected by means of a link 253 to
attained by means acting on the manual table
ture base 96 adjacent to the cover actuating piston
and cylinder device |50. The other arm of the
bell crank 254 constitutes. a latch 255 adapted to
be pivoted into a position beneath a shoulder 258
formed by the'lower end of the rack |54 and a
control plunger 88 and including the piston and
Cil cylinder )device |5| which actuates the locating
ñngers |05.L Accordingly, a slide 236 is mount
ed ina guide 231 oirthe underside. of the pro
jccting forward end of the base 96 of the ñxture
for horizontal movement toward and away from
10 the forward face of the bed I0. The slide 236 is
Apositioned directly above the arm 92 which actu
ates the table control plunger 80. A pivoted latch
238 mounted on the slide has a downwardly fac
ing notch 239 adapted to engage atooth 245
fixed on the arm 92. Between the guide 231 and
an upwardly projecting arm 24| on the latch 238,
a spring 242 acts to pivot the latch 238 down
wardly into engagement with the tooth 240.
The slide 236 is reciprocated by a bell crank
device mounted in the base l91 `of the yfixture and
acting between the slide and the piston and cyl
inder'device |5I.- As shown in Fig. 18, the bell
one arm of a bell crank 254 mounted on the fix
spring 251 acting between the stationary guide
|55 andthe bell crank 254 urges the latch 255
toward its active position. `
In the use of the safety trip mechanism, the>
hand lever 258 must be actuated and the latch
255 held out of the path of the shoulder 256 until
the rack |54 has been moved a substantial dis
tance in a cover-closing direction.
At the start, the table |4 is in the central
position of Fig. 1, the cover 91 is in its open po
sition, the ejecting pins |26 are in their lower
most or inactive positions, and the locating fin
gers |85 are withdrawn to their inoperative po
sitions as shown in Fig. '7. The operator inserts
one piston W into each sleeve 98 with thev closed
crank device comprises a vertical shaft 243 ro
tatably mounted in the base section 95 at one
ends of the pistons facing downwardly in position 25
25 side of the slide 236 and having laterally pro
jecting arms 244 and 245 ñxed at its upper and to contact the locating pins 99a. In loading the
lower ends. The arms 244 and 245 have pin and s pistons W, the operator places the bearings A in
slot connections 248 and 241 respectively with the approximate alinement with the tools.
The operation »of the machine may then be
connector |58 and the slide 236.
When the piston and cylinder device |5| 'is instituted, and for this purpose the operator must 30
actuated rearwardly to movethe locating fingers withdraw both’hands from the fixture and simul
into their active positions, the latch 238 rides over taneously actuate the safety trip handle 250 and
the starting switch 2|1.
the top of the tooth 248 until the notch 236 en
The closure of the switch2|1 starts the motor
gages the tooth. Continued rearward movement
35 of the slide 236 causes the lever 92 to be rocked Y|89 which by rotation of the control shaft |85, 35
rearwardly. from the position of Fig. 5 tothat of causes the cam 225 to close the switch 22| to
Fig. 3 and the table control plunger 80 depressed. establish a running circuit for the motor. As the
This releases the dog 86 (Fig. l2), but the stop
plunger 53’remains in its depressed or table stop
-ping position due to the reduced pressure at its
lower end caused by the'connection of the ports
83 and 84. When the piston and cylinder device „
.|5| is reversed to Withdraw the locating fingers
|55) the control plunger 88 is also withdrawn from
control shaft |85 rotates, the cam |82 actuates
. the valve member |68 to close the cover 91. 4In
the closing movement of the cover 91 the clamps .;
| I5 are positioned within the skirts of the pistons
\W and the clamping bars |02 are yieldingly
pressed into engagement with the upper ends of
the pistons W so as to move the- same into contact
45 the position shown in Fig.v 3 to the position shown j with the locating pins 99a.
The cam |83 then 'shifts the valve member |61
in Fig. 5 so as to~»institute the automatic cycle
of table movement. Such movement of the table to cause movement of the locating fingers |05
|4 shifts the .dog 23| from its position .above'the ' rearwardly of the fixture` In the course of such
>switch arm 232 so that the `switch 230 opens and movement, the ends |05a enter the bearings A and
50 terminates the clamping cycle of the control shaft engage ~the sides thereof to aline same with the ,
|85. It Will be noted that the control plunger 80 tools.
»is maintained in its depressed >position by .the . -,While the bearings of the pistons W are held
latch 238 throughout substantially the Ventire
clamping cycle ofy the fixture and duringrsuch
>time it is impossible for the operator to institute
movement of the table.
yPreferably the latch288 is disengaged from the
in'alinement with the tools by locating fingers
|05, the cam |84 shifts the valve |68 -and thereby
causes Vthe piston and .cylinder device |52 .to op
erate the clamps | |5 and secure the pistons W in
The cam |83 then permits withdrawal .
arm 92 after the control plunger 80 has been Ä of the locating fingers |05 out of the path of the
withdrawn so as to permit use of the control tools. Rotaticnof the control shaft |84 is now
plunger'80 for manually,stopping the movement of stopped due to opening of the switch 230 in the
the table |4. This end is accomplished by an running circuit by movement of the Work table
|4 from its. central position.
adjustable screw 248 mounted in the guide 231
and providing an abutment lying in the path of'> ` The initiation or the automatic cycleof table
movement is controlled by the shaft |85 through
the arm 24| in its forward movement.
Injury to the operator is prevented by a safety
trip mechanism which requires actuation simul
the medium of the piston and'cylinder device |5| 05
which, during its actuation of the locating nn
taneously with the starting switchl 2 | 1 in order to gers |05 also- operates the manual table control
initiate operation of the machine,y thereby insur ,_ -plunger 80. In the rearward movement of the
ing withdrawal of both of the operator’s hands locating fingers |05,.the slide 236 and its-latch
`238 are actuated rearwardly so that the latch
The safety trip mechanism comprises a hand lever ` rocks the lever 92 and depresses the table controlv
258 fixed on the forward end of a horizontal rock _ plunger 80. The hydraulic connections between ,
70 from the fixture before the cover thereof is closed.
shaft 25| mounted in the base 96 of the fixture.A the plunger 80 and the table stop valve 53 cause , _
The rock shaft 25|» extends rearwardly and adja v the latter to-be depressed, thereby-'releasing the
cent the rear end thereof, an arm 252 is fixed. The dog 86, and the valve 53 is held in its depressedl 75
table-stopping position until the plunger 80 is
withdrawn by forward movement of the locat
ing fingers |65. The stop valve 53 is then re
leased for upward movement whereby it institutes
the table movement.
Due to the positioning of the direction valve
23, the table moves to the left (Fig. i9) and after
moving the pistons W through a roughing opera
tion with respect to the tools I2, the dog 59 en
10. gages the reversing valve plunger 41 which causes
reversal of the direction valve 23, resets the re
versing plunger 46 in its uppermost position, and
institutes movement of the table I4 to the right.
In such movement to the right, the dog 86 is inef
15 fective and the table moves to the right until the
finishing operation is performed by the tools |29,
after which the reversing valve plunger `46 is
ment of said element, means governed by said ele
ment and operable upon movement of said ele
ment from its idle position to interrupt said run
ning circuit and stop said power driven means
and operable upon return of said element to its IS>
idle position to reestablish said running circuit
to cause unclamping movement of said device, and
means to break said running circuit upon com
pletion of said unclamping movement.
2. A machine tool having relatively movable 10
tool and work supports, means operable to move
one of said supports automatically through a work
performing cycle and to stop said support upon
completion of said cycle, a work fixture on said
work support, a work-clamping device on said l5
ñxture, actuating means for said device operable
actuated and the table reversed so as to return
to move said device successively through a clamp
ing movement and an unclamping movement,
to the left to its central position.
means for manually initiating said clamping
As the table reaches its central position in its
movement to the left (Fig. 19) the stop dog 86
depresses the stop plunger 53 and stops the table.
Simultaneously, the dog 23| actuates the arm
232 (Fig. 12) and closes the switch 230, thus
25 closing the running circuit to the motor |89 and
instituting the unclamping cycle of the control
shaft |85. In the initial portion of this cycle
the cam |84 permits the valve |68 to return to
its initial position thereby causing the clamps
movement, means operable as an incident to the 20
clamping movement of said device to initiate the
working cycle of said movable support, and means
responsive to movement of said movable support
to interrupt the operation of said device and at
the end of said working cycle to initiate the un- 25
clamping movement of said device.
`3. A machine tool having an element movable
in a work performing operation, a work fixture
having a clamp, actuating means for said clamp,
| I5 to be released. The valve |66 is then permit- . a control device for said actuating means, a mo- 30
ted to reverse its position andthe cover is opened tor for driving said control device, a normally
by its actuating device |50, and at substantially open starting circuit for said motor adapted to
the same time the notch 221 in the cam 226 is be manually closed, a running circuit for said
moved into registry with the plunger 223 so that motor arranged to be opened after a predeter
35 the switch 22| is opened and the rotation of the
control shaft |85 stopped.
As the cover opens, the pawl |39 (Fig. 11) en
gages the tooth |4| on the rotatable arm |33, and
through the link |42, levers |4| and |2|, causes the
40 work ejecting pins |26 to be moved upwardly
against the retracting action of the spring |3|.
After the pistons W have been raised a sufficient
distance to overcome any wedging action between
the pistons and the sleeves 98, the pawl |39 en
gages the stationary cam surface |46 and is shift
A ed radially to release the tooth |4| so that the
ejector pins are withdrawn by the spring | 3|.
In the subsequent closing of the cover, the pawl
|39 is again engaged with the tooth |4| and con
ditioned for actuating the ejector pins.
The operator then removes and replaces the iin
ished work and institutes another cycle of opera
tion as above described.
It should be observed that in the forward move
ment of the slide 236, the latch 238 strikes the
abutment screw 248 and- is disengaged from the
plunger operating arm 92 so that the table may
be stopped at any time during the machine op
eration by shifting one of the manually operable
60 control levers 94.
I claim as my invention:
1. A machine tool having, in combination, an
element movable in a work performing cycle and
having an idle position, a work iixture, a work
clamping device on said fixture, power driven
means controlling the movements of said device,
a manually operable member for initiating opera
tion o_f said power driven means to cause clamping
movement of said device, means constituting arunning circuit for supplying power to said power
driven means to continue operation thereof after
actuation of said manually operable member, a
mined number of revolutions of said motor, a 35
switch in said‘running circuit controlled by said
element, and means adapted to be actuated by
said control device to initiate movement of said
4. A work fixture having a seat for the work, ¿o `
a clamp for securing the work against said seat,
an actuator for operating said clamp, a work
ejector normally urged toward an inactive posi
tion, a disengageable vlatch connection between
said actuator and said ejector forv moving said w
ejector to its active positionas'said actuator re
leases said clamp, and means operable to release
said latch connection during the terminal por
tion of the releasing movement of the clamp to
permit return of said ejector to its normal inac- 50
tive position.
5. A machine tool having a base, a movable
work table, automatically operable means for
moving said table through a work performing
cycle, said means including a manually shiftable 5s
control member on said base for starting and
stopping the movement of said table, a work
fixture mounted on and movable with said table,
means for clamping a work piece in position on
said fixture, and an element on said fixture posi- 50
tioned adjacent said control member when said
table is in its idle position and movable as an in
cident to the operation of said clamping means
to actuate said control member and institute said
6. In a machine tool having a movable ele-`
ment, automatically controlled means- for actuat- .
ing said element, said means including a con
trol member movable into one position to pre
pare said means for initiation of the working 70
movement of said element, and then into another
position to initiate said movement, a work-clamp
control member for said element operable by said
ing fixture, actuating means for clamping said
power driven means after completion of said
fixture, and means operable as an incident to the
clamping movement to initiate the cyclic move
clamping operation to move said control mem-.i5
‘ ber to said one position during said clamping
ing ends of said fingers laterally into opposite
operation and then to shift said member to said
other position, said last mentioned means being
arranged to release said member for manual actu
ation while in said other position.
mounted for movement transversely with respect
to the desired longitudinal direction of the bore,
7. In a machine tool having an element mov
able in a Work performing operation, automati
cally controlled means for driving said element
through a work performing cycle, said means in
cluding a control member operable iirst in one
position to prepare said means for initiation of
said cycle, and then in another position'to effect
initiation of said cycle, a work clamping ñxture,
actuating means for clamping said fixture, means
15 operable as an incident to said clamping opera
tion to move said control member to said one
position during said clamping operation and
then to said other position.
8. A machine tool comprising tool and work
20 supports mounted for relative movement along
a given path, a tool on Said tool support, a work
ñxture on said work support adapted to have a
work piece inserted thereinto laterally with re
y spect to said path to position the work piece in
said fixture for engagement with said tool, a
closure member to enclose the work piece Within
-the ñxture, and a guard on said fixture extending
longitudinally with respect to said path beyond
said tool to guard said tool in all positions of said
supports relative to each other.
9. In a boring machine having a bed, oppo
sitely positioned alined boring tools mounted sub
stantially horizontally at opposite ends of said
bed and projecting toward each other, a table
mounted on said _bed for reciprocation parallel
to said tools, a work fixture mounted on said
table between said tools, said iixture having a
hollow base section open at the top and having
„side walls projecting upwardly beyond said tools,
means providing a work receiving seat Within said
base section, shiftable closure means for the top
of said base section, said side walls having open
ings therein to permit engagement of said tools
with the work, and guards secured to said base
section and extending in opposite directions from
said iixture above and downwardly along the
sides of the tools._
10. A machine tool having a work-clamping de
vice, power means for actuating said device, man
50 ually operable control means for eiïecting clamp
ing operation of said device by said power means,
a latch normally preventing operation of said de
vice by said power means, and manually oper
able releasing means for said latch requiring
actuation by one hand of the operator while the
w operator’s
other hand is used to operate said con
trol means.
11. In a work iixture, the combination of a hol
low base, means providing a seat for receiving a
cylindrical work piece having a transverse bore,
a slide mounted for movement transversely of the
axes of the Work piece and the bore, a pair of
elongated locating fingers with their longitudinal
axes extending generally along the path of move
ment of said slide, and pivoted intermediate their
ends on said slide for scissors-like movement, the
corresponding ends of said iingers extending
toward each other for movement into the ends
of said bore, and cam means acting between said
70 base and the other ends of said fingers to pivot
the same toward and away-from each other in
the reciprocation of said slide.
12. A work-locating device comprising a pair
of ñngers, a reciprocable slide upon which said
75 iingers are pivoted for movement of correspond
ends of a bore in a work piece, said slide being
and cam means operable in the movement of said
slide toward the work to pivot said fingers into
the end of said bore and in retractive movement
of said slide to move said lingers outv of'the bore.
13. A work-locating device for a generally cy
lindrical Work piece with a bore at right angles
to its axis comprising a support, work-locating
elements mounted on -.aid support for movement
toward and away from each other to position the
same from the exterior> of the Work piece within
opposite ends of the bore, >said support being mov 15
able in a direction transverse to the direction of
said first mentioned movement to cause said ele
ments when in the bore to rotate the work until
both elements contact the side of the borev ~to
locate the axis of the bore,_and means for impart zo'
ing said movements respectively and in unison to
,said support and elements.
14. A machine tool comprising, in combination,
a pair of tools for operating in opposite ends of
a bore in a work piece, >means for moving said 25
tools from positions spaced from the work piece
into said bore, work-locating elements for posi
tioning said work piece to' aline said bore with
said tools, means for moving said elements trans
versely of said tools, and means for superimposing 30
upon said transverse movement a movement lon
gitudinally of said tools to position said elements
within said bore, the transverse' movement there
by rotating said work piece, said elements there
after being withdrawn to positions out of the wa. 35
of said tools.
15. A machine tool comprising relatively mov
able tool and work supports, means for moving
one of said supports through a work performing
cycle, work-clamping means on said work sup 40
port, mechanism for eiiecting the clamping and -
unclamping movements of said work-clamping
means, manually operable control means for said
mechanism to initiate clamping movement of said
work-clamping means, means for initiating move 45
ment of said support-moving means operable by
said work-clamping means, and control means in
parallel with said manually operable control
means operable by the movable support at the
start of said cycle to halt operation of said 50
mechanism at the completion of the clamping
movement and at the end of said cycle to renew
operation of said mechanism to effect unclamp
ing movement of said work-clamping means.
16. A machine tool having an element movable 55
in a work performing operation, means for mov
ing said element, a work ñxture having a clamp, i
an actuator for said clamp, a control device' for
said actuator, a motor for driving said control
device, a normally open starting circuit for said 60
motor adapted to be manually closed, a rmining
circuit for said motor, a switch in said running
circuit adapted to be held closed by said element
but adapted to be opened and closed by movement
of said element to hal*J and renew operation of 65
said device, and a second switch in said running
circuit adapted to be opened by said control de
vice to stop operation of said device.
17. A machine tool having an elementmov
able in a work performing operation, mechanism 70
for moving said element through a working cycle,
a work _fixture having clamping means, an actu
ator for eiïecting clamping and unclamping
movements of said clamping means, a. control
device for said actuator, a motor for driving said
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