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Патент USA US2008128

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July 16, 1935.
Filed Oct. 27, 1932
2 Sheets-Sheet 1
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Juiy 16, 1935.
R. s. CoNDoN El‘ A_L
Filed Oct. 27, 1932
2 Sheets-Sheet 2
.li'ober'i J C'QnCZOn and
Patented July 16, 1935
Robert“ S‘. Condon and Clarence
Rochester, N. Y., assignorswtoGtleason Works,
Rochester, Y., a; ‘corporation of New York
Applicationo‘ctob'er‘ 27, 1932,, Serial No. season‘
18 Claims‘. (oi. 125-11)
The present invention relates to dressing mech
anisms such‘ as employed in truing the operating‘
without interference with‘ the operation of ‘such
surfaces of grinding wheels and in particular it
Another object of the invention is to provide ‘a
relates to manually-controlled dressing mecha-‘ dressing mechanism which‘ an‘ operator may put‘
Few grinding machines are provided with auto
matic dressing mechanisms. The common prac
tice is for the operator to dress the grinding wheel
by handby manually reciprocating a truing» tool
into operationsimply by movement of an opera_t-. 5“
ing handle and‘ which will then complete the
dressing cycle without'further attention from. the
Still‘ another object of the: invention is to pro
across the surface to be dressed. Now, a recipe vide a ?uid-pressure‘ operated dressing mecha- 10“
rocating truing tool turns‘ a continuous
the surface of a grinding wheel and the
ness of the surface ground by the wheel
directly on how ?ne and how uniform is
helix on‘ nism'in-whic‘h a pair of dressers‘ can be so‘ coupled,
smooth together that al'singl‘e control‘ valve can be em?”
depends ployed to control theoperation of both.
the lead
A further objectof the invention is to provide
of this helix. In hand-operated dressing mecha-‘
nisms, as heretofore built, the‘human element has
always entered too much into the dressing opera
tion and it has been extremely di?icult to get
a dressing mechanism in which‘ the dressers for 15“
truing a side’ and’ the tip‘ surface of a grinding‘
wheel are carried on‘ the same part and operated
through a single-“mechanism- and by a single
satisfactory results especially where precision movement, thus eliminating one of the dressing
grinding was desired. At one time, an‘ operator
units heretofore‘re‘quired for dressing the‘sur‘faces 2‘0
would move the truing tool across the grinding‘ of a’ grindingwhe‘el and reducing the cost of a
wheel faster than at another time and no‘ oper‘a—' cbmpleteudres‘s‘ing unit and rendering the unit
tor’s- nerves Were ever so steady that he moved more‘ compact‘;
the truing tool across the whole face of the wheel
Thedres'sing' mechanism of the present inven-_
at an» absolutely uniform speed.
i ‘
Another objection to hand-dressing mecha
tion‘ differs from previous‘ dressing mechanisms 25'
in that, while manually controlled, it is actually
nisms of previous constructions has been‘ the loss operated‘ automatically. _ The movement of the,
of time of the operator in the dressing operation.
truing tool across‘ ‘the face of the wheel takes
The operator has had to manipulate the tool to place underhydraulicpower. The human ele
effect the vdressing operation‘ and, therefore, the ment is‘ entirely ‘eliminated and a smooth and‘ 30*“
time required for dressing has meant time. that uniform‘ movement of the truing tool across the‘
could not be devoted to other work.
grinding wheel is insured without the cost and’
The primary purpose of the present invention
’ is to
provide a manually-controlled dressing
mechanism in which the human element is‘ en
tirely eliminated as a factor in the dressing oper
complication‘ of‘?an automatic dressing mechjai
mm. A manually shiftable reversing valve con-‘
trols'the‘ reciprocation‘ of the truing tool or tools“ 35‘;
across the side or' sides‘ of the grinding wheel‘.
whilelthe'desiredjrate‘of travel of the'truing tool‘,
A further object of the invention is to providei. or ‘tools'acro‘ssjthe' wheel is‘c‘ontr‘olled by a‘man
a dressing mechanism in which the fineness“ of i
rate these’
of the truing'
‘ valve.
or tools
dressing can he predetermined and is not depend; ually
ent on the skill'of the operator.
grinding wheel‘ can'he predetermined exactly by
Another object of the invention is to provide a“ adjustment of‘ the throttle valve and is entirely
dressing mechanism which is fully protected from independent'ofthe skill of theoperator. ‘
Water and grit and‘whioh will, therefore, operate
The'reve‘rs‘in‘g‘v valve is a sliding valve and isv
- an extended period without attention;
In this?‘ shifted by movement of “an operating handle c1445”
connection, it is a‘further purpose of the inven knob secured‘thereto. Through an ingenious are
tion to ‘incorporate intov a dressing mechanism, rangement thethrottlej valve‘ can be adjusted‘by
means for sending a blast of air through the rela-' rotating this same knob‘or handle.
‘ '
tive‘ly movable parts, each time thed‘re's’sing‘ The‘ truing tool‘is's'ecuredto the head‘ of a pis
mechanism is operated; thereby blowing grit‘ and ton rod- that is ‘hydraulically reciprocated under 50‘ “
dirt out from between the parts.
‘ m control of the reverse and throttle‘ valves. gTo'ob-‘i
Another object of the invention is to provide a tain~ compactness together with strength and rig
dressing mechanism which‘will be extremely com-f gidityi the‘piston‘rod"isfmounted‘to "reciprocate in ,
, pact and which will occupy a minimum of space; aaeceemnqasm provided" in; a- relatively ‘?xed;
so "that it can-be ‘readily used? on'eii‘is'tiri‘gmachiries guarantees a support? an; the ailing» toolis 55"
guided in its reciprocation by a key, that engages and the dressing unit and further illustrating in
in a longitudinal slot cut into the guide member dotted lines how a second dressing unit might be
or support at its thickest part, that is, cut into the coupled into the system so that two" units for
periphery of the guide-member at the point most dressing opposite sides of a grinding wheel can
remote from the center of its bore. The key is be controlled simultaneously from a single revers
carried by a skirt or sleeve that is connected to ing valve;
Figure 2 is a View showing another‘ embodiment
the head of the piston rod and that surrounds the
of the present invention in which means are in
guide member.
Telescoping guards are provided to prevent en
corporated enabling the dressing‘ mechanism to
10 try of water or grit into the parts‘ as the truing - complete its cycle automatically once the revers
tool reciprocates back and forth. As a further, ingvalve is tripped. In this ?gure two dressing
means of protection, the device already referred units are shown coupled together and in position
to is provided for blowing out the guards auto for dressing'opposite sides of a grinding wheel,
matically each time the dressing mechanism is and one of the units includes both a side and
15 operated, There is a valveinounted in the rela
a tip truing tool. Further, this ?gure shows an
tively ?xed guide or support; Thisgv‘alve is so arrangement wherein the side truing tools move
constructed that when the truing tool moves out simultaneously in opposite directions;
wardly across the grinding wheel, air is drawn ‘ Figure 3 is a diagrammatic view on a reduced
in between the skirt of the piston rodheadand , scale showing how the reversing valve and dress—
the rod or support, and, when the truing tool
ing units maybe connected to have the two side
makes its return stroke, the valve is substantially truing tools moving simultaneously‘in the same
closed and this entrapped air is forced out be direction; _
tween the parts of the telescoping guards, blow
Figure 4 is a transverse sectional view through
one of the dressing units, taken at a point such
, In one embodiment of the invention, as men-V as indicated by the line Q—4 in Figure 1;
ing grit and water out.
tione'd above, the operator is‘ only required to
push the reverse valve in to start the truing op
eration and the rest of the operation will be com
pleted without his further attention. When the
30 reverse valve is pushed in, hydraulic pressure is
applied to one side of the piston to which the
truing tool is connected and the truing tool is
moved ‘across the face ‘of the grinding wheel.
The exhaust fluid from the other sideof the pis
35 ton operates a hydraulic load and ?re mechanism.
When the truing tool has traveled across the face
of the grinding wheel, this load and ?re mecha
nism is tripped and the reverse valveris reversed.
This causes the 'truing tool to be returned to orig
Figure 5 is a fragmentary sectional view on
the line 5—.5'of Figure 4;
, Figure 6 is an enlarged fragmentary View show
ing the breather valve which controls admission‘
of air between the reciprocating parts during op 30,
eration of a dresser unit;
Figure '7 is a fragmentary plan view, showing
the cylinder-end of one of the dresser units; and
Figure 8 is an end view of the trip-lever, which
operatively connects the load and ?re mechanism
with the reverse valve. ‘
In the drawings,‘I have shown several different
embodiments of my invention. The same dress
ing unit can be employed in all the various em
bodiments of my invention. If it is required to 40
dress two sides of a grinding wheel, the dressing
unit employed for dressing one side of the wheel
can be duplicated. This is true regardless of
inal position clear of thewheel and the truing
operation is thus completed. When this embodi
ment of the invention is used, it takes but a'sec
0nd for the operator to start the truing mecha
nism and he is left free to attend to the grinding whether the two dressing units be arranged to
move simultaneously in opposite directions or si
45 machine or to take care of other duties in connec
_ tion with his‘ work.
multaneously in the same direction.
By suitably pro-portioning the parts, it is pos
sible, through use of the load and ?re mechanism,
to secure a dwell at the end, of the stroke of the
50 member carrying the truing tool.’ The purpose of
providing this dwell is to allow a tip truing tool
tobe mounted on the same reciprocable part as
one of the side truing tools. Thus, the tip truing
tool is brought'into' engagement with the tip sur
face of the grinding wheel at the end of the for
ward stroke of the side truing tool and the dwell
' in the stroke of the reciprocable part allows'the
. '
Referring then to the drawings by numerals of
reference, It] indicates a support or guide con
stituting a relatively ?xed part of a dressing unit
constructed accordingto the present invention.
The support It] is formed to provide a cylinder i I
and a cylindrical extension or guide I 2.
The ex
tension or guide i2 is bored eccentrically of its pe
riphery, as'clearly shown in Figure 4.
A piston I4 is mounted to reciprocate in the
cylinder H’ and to the piston ill there is secured
by a nut IS a piston-rod l5. . The piston-rod pro
tip truing tool to remain in engagement with the jects forwardly through one end-wall of the cylin
grinding wheel long enough to true up-the tip der ‘I I into and through the eccentric bore of the
130 surface of the, grinding wheel. As against pre guide-extension (2. The piston-rod is of a diam~
vious constructions, this improvement eliminates eter to fit snugly the bore of the guide-extension so
one truing unit entirely,_ namely, the tip truing that the part. !2 serves as a bearing and support
unit, with the resultant important gainin com for the piston-rod in its movement.
'pactness. Space is always a vital factor within
The piston-rod I5 is formed with an enlarged
65 a grinding machine.
The principal features of the invention have
been referred to above. The invention includes,’
however, several further constructional improve
ments that will be apparent hereinafter from the
70 speci?cation and from the recital of the appended
In the drawings:
Figure 1 is a view illustrating somewhat dia
grammatically one embodiment of the present
invention and showing in section thereverse valve
head at its outer or forward end and to this head
there is secured a sleeve or skirt IS. The skirt is
held in position by a nut H which threads onto
a stud I9 that is integral with the piston-rod IS.
The sleeve or skirt I8 is tubular in shape and fits
over and telescopes on the guide~extension l2.
There is a peripheral groove 26 out longitudinal
ly in the guide-extension i2 at the thickest portion
of the same, as shown in Figure 4. There is a key
2| secured by screws 22 to the skirt I8. This key
engages in the groove 20. A longitudinally ta 75
200831-281 ‘
pering gib 23 is also mounted in the groove 20 and
The valve‘ stem 35 is also provided with a bore?
can be adjusted by the screw‘ 24 to take up wear. of 59 which is in alignment with the bore 55.. When
the groove and key.
the throttle valve 58 is open, fluid can‘ flow from
By providing the eccentric bore in the extension the duct 55 through the throttle valve opening
l2, the groove 20 can be made of the requisite’ into the bore'59 and‘ thence through radial ducts‘
depth without weakening the‘ extension and sothe 60 into theig'roove 42 in the valve stem.’
. .
dresser unit can be kept'quite compact. If the
The throttle valve 58 is integral with a rod 62'
extension were bored centrally for the piston that is threaded forv a’portion of its length to
rod l5, the extension would have‘ to be of con thread adjustably into the bore59. The rod 62
10' siderably larger diameter to permit cutting a'k‘e'y
carries a; pin 63' at its rear end that engages in a 107
way in‘it and thus the size of the wholciiuiit would longitudinal slot 54 formed in the valve-cap 65
be increased‘.
' ‘
to hold the rod‘, 62 against. rotation relative to
In Figure 1, 25‘ designates a diamond dressing the‘ valve-casing. 31. By rotating. the valve. stem
toolv such as is commonly used in dressing mech 35, then, the amount oil-opening of the throttle‘
anism. The tool is mounted‘ for rotatable adjuste valve 58 can be adjusted to control the rate of
ment in a lug 24 formed‘ integral‘ with a plate 26‘ movement of the dressing diamond or diamonds
and the plate 26 is fastened by screws 21 to the across the face of the grinding wheel, as will
head of the skirt [3. The diamond‘ 25 projects‘ hereinafter be further described. To insure ac-’
at one side from this plate 26 in position to dress curate adjustment of the throttle valve, a gradu
the side of a grinding wheel on reciprocation of ated‘ dial 65 is provided. This dial is secured to 201*
the piston I 4.
the valve stem 35 by a set-screw 66. The gradu
In Figure 2, one of the dressing units is shown ations of this dial read against a pointer 61 that
arranged to carry both a side dresser and a tip is secured in any suitable manner to the valve‘
dresser. The side dresser is again designated as casing 31.
25 25, while 28 denotes the tip dresser. The plate 29
The reverse valve is operated by pushing or
which carries the two dressers 25 and 28 is of pulling the knob 68 thatis secured in any suitable
a different shape from the plate 26 which is in mannerto the valve stem 35. The groove ‘64 is’
tended to carry the single dresser. The plate 29 long enough for the pin 63 to remain in engage
is provided with an arm 3!] that extends a con
ment with it throughout the whole of the‘ move
30 siderable distance forward from the plate. The ment of the valve stem in either direction.
Spring-pressed detents are provided to‘ hold the
side and tip dressers are bothmounted in this
arm. The side dresser 25 is rotatably mounted in valve stem at either limit of its reciprocating
the forward end of the arm in a manner similar movement. These may take the form of balls 10.
to its mounting upon the plate 26.
The valve stem is provided at its inner end with
The tip dresser 28 is here shown as having a an enlarged head ‘i I. This head is beveled off as
conical operating ‘surface and as being threaded‘ indicated at '12 and is provided with a V-shaped
into the arm 3E! for adjustment thereon axially groove as indicated at 13. The sleeve 35 is pro
of its conical operating surface. To permit pre vided at its inner end with an enlarged head 15
cise adjustment of this tip dresser 28, it may be that engages a shoulder formed interiorly of the
40 adjusted against a stop-screw 3| that is threaded valve casing 31 to hold the sleeve against axial 40%
into an arm 32 also formed integral with the movement in one direction in the casing. The‘
plate 29.
end of this head 15 is beveled oii as indicated at
The tip dresser 28 may be made of carboloy or a‘ 76; The balls 10 are mounted in holes drilled in
similar material embedded with small diamonds the valve-casing and are pressed interiorly of the
45 or it may be made of some hard material like casing by the coil springs 18 which are inter
carborundum. The operation of the tip dresser posed between the balls and the plugs 79- which
will be described more particularly hereinafter. thread into the casing. The spring- pressed balls
The dressing units are hydraulically operated. will ride on the sides of the groove 13 and the side
We shall ?rst describe the operation of the em. of the bevel ‘l2 and hold the valve stem resiliently
bodiment shown in Figure 1. Here the opera in either limit of its movement. ‘
tion of the dresser unit is controlled by a reverse
The valve casing 31 is connected with an oil
valve 35. This valve 35 is mounted to slide in a pump or other suitable sort of fluid‘ supply by
sleeve 36 that is secured in a valve-casing 31.
the‘ pipe 30; The pipe 8! is an exhaust line
The valve 35 is provided with spaced peripheral leading from the valve casing back to a sump.
55 grooves 38, 39, 49, 4| and 42. The'sleeve 36 is The valve casing is connected with the cylinder
likewise provided with spaced peripheral grooves H by ?exible'piping 82 and 83. Thepiping 83
44, 45, 46, 41 and 48. Each of the grooves 44, 45, threads at one end intoa cap plate 84 that closes
46, 41' and 48' is connected with the bore of the the outer end of the cylinder H and is secured
sleeve by a series of radial ducts that are drilled to'the support . Ill by screws 35. ‘At its‘ other
60: from the interior of the sleeve into the grooves. endtthe piping :82 threads into the valve cas-J
The ducts that connect the groove 44 with the ing 31 and communicates with the groove 4‘!
interior of the sleeve 36 are designated at 50, the of'the sleeve 38.‘ The piping 82 also threads at
corresponding ducts which cooperate with the
groove 45 are denoted at 5!, while 52., 53 and 54, one end into the cap-plate 84. It communicates
65 respectively, denote the ducts leading from the with a duct 85 (Figures 1 and 7) and also with
a; duct 81 that leads into a duct 88 that extends
grooves 45, 41 and 48, respectively.
The valve stem 35 is provided with a central parallel to the duct 85. A duct 98 leads from]
bore or duct 55. This cornmunicates'with the the duct 85 into the cylinder H at a point inter
groove 39 through radial ducts 56 and with the mediate the ends of the cylinder. A duct 9!
70 groove 4! through radial ducts 51. One end of \ leads from the duct 88 into the cylinder II at l
the bore 55 is formed with a tapered-seat for a the forward end‘ of the cylinder. The ducts 86‘,
tapered throttle valve 58‘and near its other end, 81, 88; Sill-and Blare drilled into the support 16.
the bore is formed ‘with a seat for a balls-relief‘ The "outer ends of the ducts’ 98 and 9| are closed’
valve Biwhich'is pressed‘to closed position'by the by plugs‘ 92- and 93, respectively. At its- other
1 end; theqpiping 82, threads intoeth'e" casing‘ .31’
‘spring BI’.
at av pointv to communicate with the groove 45 diamond
opposite directions is of no moment‘,
the. relief valve 6| can be omitted.
The ball-check valve 95 has no special func
"A ball-check'valve 95 is provided in the duct
86 to prevent flow of ?uid through said duct tion when a single dresser unit is employed and
in one direction. The ball-check valve is. DOT-r it is ordinarily preferred to omit it in a single
of the sleeve 36.
'In the position of the parts shown in Fig
ure 1, the motive fluid flows from the supply
10 line 80 through the groove 46 and ducts 52 in
the sleeve 36, the groove 40 in the valve stem 35,
the ducts 5i and the groove 45 of the sleeve‘36,
the piping 82, ducts ill, 88 and 9| into the for
ward'end of the cylinder H, forcing the piston
l4 rearwardly in the cylinder to traverse the‘
diamond 25 in one direction across the side
dressing mechanism when a pair of dressing un
its are combined together.
It is a difficult but a'very necessary task to 10
protect a dressing unit against grit and water,
for if grit or water get into the unit it will
quickly wear out or‘ rust...‘ Telescoping guards
are provided to protect the dressing unit of the‘
present invention,'but guards have been used
before and‘they are not always adequate pro
tection against keeping grit and water from get»
ting into the operating parts. Hence, we have
provided a very simple and inexpensive device
for the maintaining the parts'free of grit or 20'
surface of a grinding wheel. At this time, the
?uid exhausts from the rear‘ end of the piston
dresser unit. .Its purpose will appear-herein
‘after in the explanation of the operation of the
mally held in operative position by the coil
l4 through the piping 83, the groove Ill and
ducts 53 of the sleeve 35, the groove 4! and ducts
51 of the valve stem 35into the duct 55 of this water.
The telescoping guards are clearly shown in
stem, forcing the throttle valve 58 open to the
extent allowed by the adjustment of the rod Figure 1. There is a tubularguard Hill secured
62, and ?owing through the ports 59 of‘ the in any suitable manner to the sleeve or skirt l8
25 valve stem, the‘ groove £52 of the valve stem, the and there are two tubular guards Hit and IE2 25>
ducts 54 and groove 48 of the sleeve 36'into ‘the secured in any suitable manner to the support Hi;
line 8| whence the exhaust ?uid returns to the The guards HH and “32 are of such diameter and
When the knob 68 is pushed inwardly, the di
rection of travel of the diamond 25 is reversed.
' The motive ?uid will then flow from the supply
' so spaced from one another that the guard I69
will telescope between them and the guard llH~
is also of such diameter that it will surround the 30“
skirt l8. Felt rings led may be inserted in the
pipe 80 through the groove as, ducts 52, groove skirt is to further help seal and protect the
As a still further
40, ducts. 53, groove 4'! and piping 83 into the piston rod l5 andguide
rear end of the cylinder H, forcing the piston protection, a breather valve is mounted inthe
35 I 4 forward in the cylinder. At this time, the support Hi.- This valve comprises the sleeve H35
?uid exhausts from the cylinder it through the (Figures 1. and'G’), seat Hi5 and disc H31. The
ducts 90 and 9|, 86, 88 and 87,-the line 32, groove sleeve Hi5 threads into a hole in the support 80
45, ducts 5|, groove 39, ducts .556 into the duct and serves to hold the seatlilii against a shoulder
55.’ The pressureof the liquid will force the re
40 lief valve 6| open and the liquid will then flow
through the throttle valve 58, ducts to and 54
and groove ‘48 into the exhaust line 8|.
'As the knob 68 is pushed inwardly, as de-'
scribed, the balls 1&3 vroll up out of the groove 73
45 and drop behind the bevel l2, holding the valve
stem in its rearward position. With the con
struction shown in Figure l, to reverse the valve
again, it is necessary to pull the valve stem
on the support it.
The seat Hi3 has a recess
£58 in its bottom face and the disc Sill‘ fits into 740'
this recess.
The depth of the recess M38 is sufli
cient to permit the disc it? to move freely up
and down in the recess. '
The sleeve IE5 is hollow and communicates
with the outer air through ‘the opening £09. The
seat Hi6 has a'central opening HQ extending
therethrough and the disc H5‘! is also provided
with a central aperture‘ HI
of much smaller
outwardly by grasping the knob t8 and pulling’ diameter than'the opening 5 ill in the seat “It.
Two ducts I I2 and 1 l3 are formed in the cast
50. thereon. This will cause the balls "iii to ride up
the bevel l2 and drop back into engagement with ing !0 and lead from-the seat m5 at diametrically
opposed points. These ducts communicate with
the groove 13.
‘ '
a duct H4 that‘ extends ‘into the pocket formed
It will be noted from the preceding descrip
and in which
tion that the relief valve M operates in only one between the‘ guard iii! and guide
direction of movement of the piston Ill. The pur the skirt l8 moves.
The bore of the sleeve
is filled with steel
pose of providing this relief valve is‘to’make the
pressure on one side of the piston when it is‘ wool or any other suitable material for straining
dirt from the air which may be drawn in through
moving in one direction equal that on the op
posite side of the piston when it is. moving in the breather valve.
, When the piston l4 moves to. the right in the 60
60. the opposite direction so that the dressing dia
mond will move across the grinding wheel at cylinder l I, air is drawn from the outside ‘through
the same rate in either direction of its move the opening H19; the bore of the sleeve M5, the
ment. . The effective area of the piston is less
on its front side than on its rear side because
duct H0 in thevalve seat
and around the
disc I91 into the ducts H2 and H3 and'thence
into the pocket between
guard l8! and the (i5
the piston. The relief valve hi acts, however, cylindrical guide or support l2. When the valve
to resist forward movement of the piston. By stem 35 is reversed and the piston M moves to
using a spring 6|’ of the proper tension, enough the‘left, the disc Itll is forced against the seat
resistance can be built up against the forward Hi6 and the air, previously entrapped can only
movement of the piston so that’ despite the escape throughthe very small opening I l i in the
greaterfe?ective area of the rear'side of the disc lll'l. It is therefore forced forwardly be—
piston, the piston’wlll not move forward in the tween the guard 155 and the skirt l8 and thence
cylinder by pressure on its rear face faster than between the guard 553i and the guard H26 and
it will move rearwardly by pressure on its front thence between the guard Hi9 and the guard H32.
face. If a difference in rate of movement of the Air is thus blown through this circuitous passage
65 the piston rod I5 is secured to the ‘front side of
and any dirt or grit or water that might have.
thecylinder I Ion the opposite sides of thepiston
gotten between the guards as they extended is I4 are balternately'?lled with 'oil from the source
blown out as they telescope again.
of ?uid supply. . When two dresser units are used,
In most cases, it is desirable to leave a small however, and coupled together in the manner
opening Ill in the disc IO'I to prevent building shown‘ in'Figure‘ 1, .the front ends of thetwo
up of excessive pressure when the guards tele pistons I4 and, I4.’ are not connected directly to
scope together, but, if desired, the opening II=I the source of fluid supply} If no ball-check valves
might be omitted entirely.
95 and 95' were used, no pressure‘ ?uid would ever
Packing H5 is provided to preventleakage of get into the front ends'of the pistons Ill and III’,
10 oil from the cylinder H along the piston rod I5, save that which would leak by these pistons in 1.0
while packing I i5 is provided to prevent leakage their movements, and the two pistons in their
of oil along the rod 62. The nut In which forward movements would simply be compressing
threads into the head ‘II of the valve stem 35 what air was entrapped between the pistonsand
serves to hold this latter packing in position.
Oil leaking outwardly along the valve stem is re- ’
the forward end ‘walls of the cylinders II and
II’, respectively. The ,air entrapped in the for 1.5
turned to the sump» through the ducts 50, groove
44 and leak-return pipe H8.
Where it is desired to dress two sides of a grind~
ing wheel as required, for instance, in the case
ends of the two cylinders, would never operate
the two‘ dressing units with precision. The
20 of wheels for grinding gear teeth, two of, the
pistons probably would not move fully to the left
dresser units may be coupled together and con
trolled by a single reverse .valve anda single
throttle valve. One method of so coupling two
dressing units together is illustrated in Figure l,
on their return strokes and where it was possible
for varying amounts of fluid to leak past the
pistons, the strokes of the pistons would vary in
ward ends of. the two cylinders or the oil that
would leak past the two pistons into the forward
length depending upon the amountof leakage.
where I have shown a second dressing unit cou
To insure uniform’ and full strokes;v of ‘the two 25
pled in circuit with the unit already described pistons at all times, the ball check Valves and
in such manner that the two dresser diamonds ducts 86-90 and 86'_—9Il’ are provided. The ?rst
move simultaneously in opposite directions. The time the mechanism is operated, the air in the
second dresser unit is shown in dotted lines. front end of the cylinder. II ', may be compressed,
The two dresser units shown are absolutely iden'~ but the pressure fluid willforce the piston l4’
tical in construction, but for the purpose of more far enough forward in the cylinder II’ to clear
readily describing their operation, I have desig
nated parts of the second unit by primed refer
the duct 90’, ‘and thenthe pressure ?uid will
flow through the ducts 90’ and 86’, forcing the
ence numerals.
ball check valve 95’_ open and ?owing through
To operate the two dresser ‘units, the line 82 the line I20 and ducts 81,88 and 9! into the front 3.5
is extended, ‘as shown in dotted lines at 82’, into end of the cylinder I I.v Thus the piston III will
the rear of the cylinder I I’ instead of connecting be forced rearwardly in the cylinder II, not by
with the duct 86 drilled in the casing “1.. The air compresedinithe front end of the cylinder
two ducts 35 and 85' require also to be‘ con
I I’, but by pressure fluid delivered directly from
40 nected as by the dotted pipe line I20.
the pump through the ducts ‘90' and 86' and the
When the valve stem 35 is in the position shown ball check valve 95". .
in Figure l, the pressure ?uid, will flow from the
Similarly, when the valve stem 35 is reversed,
pipe line 82'-B2 into the cylinder II’ forcing the piston I4 will be forced forward in the cyl
the piston Ill’ forward and moving the diamond indeij II far enough to clear the duct 90 and the
25’ to the.‘ right. The ?uid exhausting from the pressure fluid- will then flow through that duct 45
front end of the piston I4’ ?ows through the and ‘the duct 86, opening the ball check valve 95
ducts 85' and 88' into the line I23 whence it and ?owing through the line I20 and ducts 88'
flows through the ducts 86, 88, 99 and SI into and 9|’ into the front end of the cylinder II’.
the front end of the cylinder I I, forcing the pis~
Thus, by use of the two ball check valves in
ton I4 rearwardly in this cylinder and moving conjunction with ducts 9B and 90', which enter 50
the diamond.
to the left. The exhaust ?uid the two cylinders at points intermediate to the
flowing from the rear end of the cylinder ~II ends of the two cylinders, assurance can be had
passes through the line 83 to the valve casing 31, that the motive ?uid will flow‘ to both sides of the
whence it returns to the sump. When the valve ' pistons I4 and I4’ ‘and that these pistons will be
35 is shifted, by pushing in the knob 68,-the presj operated uniformly. Of course, to insure this 55
sure fluid flows through the line 83 into the rear uniform operation, it is desirable to eliminate any‘
of the cylinder ‘I i, moving the piston I4 and air" entering the system. i This can be done by
dresser 255 to the right. This forces the ?uid simply opening the plugs 92 and 93, 92' and 93'
out of the front end of the cylinder II through slightlyand operating . the pistons a few times
the ducts 9i} and 9!, 85 and 88 into the line I20
whence it is carried through the ducts 88’ and
9!’ (the valve 95' being forced shut) into the
of the cylinder 5 1. Thus the piston I4’
is forced rearwardly in the cylinder II’ and the
diamond 25' is carried to the left.’ The ?uid in
the rear of. the piston it’ at this time exhausts
until the air‘ is forced out of the pistons and oil be 60
gins to seep out the plugs. Then'when the plugs
are. tightened, the system will be free of air.
With a reverse valve built and operated as
described withreference to Figure 1, the operator
of themachine must push the knob 68 in to move 65
thediamonds in one direction and pull the knob
through the line til-82'. Thus with the piping out again to move the diamonds in the opposite
arranged as described, the single reverse valve direction. I This is an improvement over manually
controls the two dresser units and the two operated dressers, as heretofore constructed, for
ressers move simultaneously in opposite direc previous dressers have required that the operator 70
When a single dresser unit is used, the motive
?uid will flow from the source of fluid supply
alternately to the front and rear ends of the
‘ piston I4. Thus the two chambers. formed in,
actually move the diamonds acrossthe grinding
Where the wheel can be dressed by a
single passage of the diamond across its face
and where the diamond can be moved far enough
in this passage to clear the wheel, the construction 75
of Figure 1 can be used advantageously, but'where,
valve 35. v The pressure fluid will flow through
the diamond. must be passed twice across the the ducts I50, I5I and I52 and the port I53
wheel-to complete the dressing. or must be re->' forcing the piston I35 to the left in the cylinder
turned to initial position to clear the wheeL-the
I32 as shown. Oil in the left end’ of the cylinder
I32 will be forced out of the cylinder through the:
for as efficiency is concerned, because the operator ~ line I55 into the cylinder II’, forcing the piston
is required to manipulate the reverse ‘valve twice I4’ forward in this latter cylinder and carrying
construction of Figure 1 has its limitations,‘ so
to‘complete the dressing cycle.’
' .
’ Where an operator is attending a number of
10 machines, a considerable gain can be achieved
if provision is made whereby, once the dresser is
put into operation, it will complete its cycle of
operation automatically. Such an imrovement
in construction constitutes one of the principal
15 features of the present invention and will now be
The reverse valve stem 35 shown in Figure 2
and the sleeve in which-it slides are of identical
_ construction with the valve stem and sleeve shown
in Figure 1, except that there are a pair of pins
the diamond 25’ across-the outer side surface I60‘
of the grinding wheel W; The movement of the‘
piston I4’ forward in the cylinder II’, will force.
the fluidin the cylinder 1 I’ in front of the piston
I4’ out through the ducts SI’ and 36’, 88' and
36' and the check valve 65’ into the line I56,
whence it passes through the ducts 83 and 9!
into the front end of the cylinder II. Hence
the piston I4 is moved rearwardly in the cylinder‘
I I and the dresser 25 is moved backwardly across
the inside‘ surface l6i of the grinding wheel W.
The movement of the piston I4 rearward in the
cylinder I I forces the fluid behind the piston out
I25 (Figures 2 and 8) mounted'in the head H of through ‘the line MB and duct I531 into the valve
the valve stem, one at either side of the rod 62. casing whence it returns through the throttle
The valve and sleeve are simply shown in eleva valve 56, as described with reference to ‘Figure l,
mtion in'Figure ,2, whereas they are shown in sec-'
tion in Figure 1. These two pins I25 pass through
and pipe I46'to the sump.
' '
When the operator pushes the knob 68 in» 253
openings in the head 65 and engage, respectively, wardly, the direction of application of iluidprew
the furcated ends of a lever I26 that is pivoted sure through the pistons I5 and I4’ will be re~
at I21 in a cap I28 that is'secured to the casing versed, as described with reference to Figurel.
in casing
which 136
the is
not is
receive the
Also when the valve‘ stem 35 is pushed inwardly,
the pins; 225 will rock'the” lever £26 about its 3.0)
but it is provided with aparallel', bore ‘pivot pin I21 against the resistance of the spring
forming a cylinder I32 and with’ a bore 133 that I40. The plunger I31 will, therefore, be pushed
communicates with the cylinder I32.
7 into the bore of the piston rod 133 and the
Thereis a piston I357mounted to reciprocate spring I 40 will hecompressed. The plunger I31
I in the cylinder I32; ' This piston is formed‘with will be resiliently held in this last, described po
an’ integral‘ rod or stem I36,‘ that'is hollow, and s'ition because when the valve stem 35 is pushed
is {adapted to extend into the bore I33. -‘ There’ inwardly, the deten‘ts 16 will ride up out. of the
' is a plunger I31 mounted to reciprocate in‘the
__$ bore I33; This plunger telescopes at one end into
groove '13 .anddrop behind the bevel 12 of the
head of the valve stem.
Having pushed the valve stem in, the operator 40.
other end the arm I39 of the lever I26’. A coiled can go away and leave the dressing mechanism
spring I40 that is mounted in the bore of ‘the and it will perform its cycle without his further
piston rod I36 serves to urge the plunger I31 in attention. When the valve stem is pushed in
the bore of the piston rod I36and engages at its
p a direction outward of the bore of this piston
rod. There is a disc I38 carried by this plunger,
the purpose of which will appear hereinafter. ,
wardly, as described, line I48 will be put on sup
. ply. ' The piston I4 will move forwardly in its
cylinder I I, moving the diamond 25 forwardly
One- end of the cylinder I32is closed by the across the inside surface I61 of the grinding
plate I42 which‘is secured’in any suitable mane wheel W. The ?uid in the forward side of the
ner to the casing I30. To'prevent leakage of piston I4 will be forced out of the cylinder II‘
' oil along the piston rod I36 through'the other through the ducts 63, 91, 86 and 88, into the
end of the cylinder, a packing I43 is provided.
line I56 and thence through the ducts 68' and
The pressure fluid ispumpe'd' to the casing BI’ into the front ends of the cylinder II’. This
through the pipe I45 which takes theplace of will move the piston I4’, rearwardly in its cylin
the‘pipe 80 of Figure 1 and isconnected ‘to the der drawing the diamond 25' rearwardly across
" casing >I30‘at a point corresponding to thatat the side face I63 of the grinding wheel. The .
, which the‘pipe 80 enters the casing 31 of Figure‘ fluid forced out of the rear end of the cylinder
l. The exhaustfluid flows from the casing I30 II' in this movement will ?ow through the pipe
through the pipe I46 which corresponds tofthe' I55 into the cylinde" I32. This will force the
. apipeiil of Figure 1 and isiconnected. to the casing piston I'35'to the right in this cylinder, further
610" I36 at a correspo‘nding‘position. 'The ducal!!!‘ compressing the spring I46 which, as already de 60
communicates with the sleeve 36 at the’ same’ scribed, is already compressed somewhat be
point that the pipe 83 communicates with? the cause at this time the plunger I31 is being held
sleeve 36 in Figure 1. This duct I41'is connected over to the left fr-omthe positionshown in Fig
with the piping I48. At a point corresponding to ure 2 by the lever I26.
the pipe 82 enters the casing 31 of Figure
As the piston I35 continues to move to the
65'3' where
1, there is a duct I50 in the casing I30 of'Figure 2. right, the spring I40 .will be compressed still fur
This duct communicates with the cylinder I32 ther until the right end of the. piston rod I36
through the ducts I5! and-I52 and the‘port‘ I53 strikes the disc I38 carried by the plunger I31.
drilled in the casing I30. There is a line: I55 Then the plunger I31 will be moved on to the
' leading from one of the dresser units to the other’ right with the piston I35. This will rock the le
end of this cylinder I32. The two " dresser units
are valsoconnected by a line I56.
When the parts'are in the position shown. in
ver I 26 about its pivot i21 back to the position‘
shown in Figure 2. The ball detents 15 will ride
up the bevel 12 and the reversing valve will be
returned to the position shown in Figure 2. As
_‘ Figure 2,,the duct I50 will be on supply from‘ the
‘- line I Its-because of the position of the reverse‘ soon as the ball detents have cleared the bevel
"I2 and are riding .on the ?at I62 ‘between the 0nd ball-check valve and overflow duct must be
bevel ‘I2 and the groove ‘I3, the spring I40 will incorporated in each truing unit.
come into action and push the reverse valve
For this purpose, the top-plates I65 and I65’
quickly on back to the leftward position shown of the two dressing units shown in Figure 2
in Figure 2.
should be drilled to provide ducts I66 and I66’,
The return of the reverse valve to the position respectively. The casings I6 and II!’ should also
shown in Figure 2 will put ‘the duct I56 again be drilled to provide ducts I 6? and I61’, respec
on supply and the line I48 again-on exhaust. tively, and ducts I68 and I68’, respectively, which
The pressure fluid entering the cylinder I32 communicate therewith and which lead into the
through the port lei; will force the piston I35 cylinders .II and .II', respectively, at points re 10
‘back to the left to the position shown in Figure moved from the rear .ends of said cylinders at
2. The ?uid forced out of the left end of the distances greater than the thickness of the pis
cylinder I32 by this leftward movement of the tons I4 and I4’. Ball check valves I69 and I69’
piston I35 will flow through the line I55 into the operate in the ducts I67 and l6l’, respectively,
1,5 cylinder ii’ and the diamond 25’ will be moved and are normally held closed by springs I16 and 15
forward across the grinding wheel to return to
‘the position shown in Figure 2 and moved ‘far
enough forward to clear the wheel. The ?uid
forced out of the front end of the cylinder II’
20 in this movement will flow through the 'line ‘I56
into the front end of the cylinder II. The dia
With this modi?ed construction, when the pis
ton I4’ has bottomed in the rear end of the cyl
inder II’, the pressure fluid ?owing into the
front .end of this cylinder will continue through 20
.the .duct I68’, ball-check valve I69’ and ducts
mond 25 will be drawn back across the grinding I61’ and I65’ into ‘the line 155, driving the piss
‘wheel and returned to the position shown in Fig ton I35 onto the limit of its movement to the
ure 2. The fluid forced out of the rear end of right in the cylinder I32.
the cylinder ii in this movement will pass
When the piston .i35 moves back to the left t
through the reverse valve and the throttle valve the position shown inv Figure 2, the ?uid in the
into the exhaust line I 46.
cylinder I32 .on the left-hand side of the piston
The dressing mechanism will now have com
I35 is‘forced out of the cylinder. Since the cylin
pleted its cycle. As indicated, all that it is nec der I32 has a greater capacity in volume than
essary for the operator to do is to push the re— the cylinders Ii and H’, the excess fluid must ‘be
verse valve inwardly and the two diamonds will taken care of. The valve vI69 in» the dresser unit
be passed back and forth across the two sides .Ill does this. The fluid that is ?owing out of the
of the grinding wheel and the parts returned to left end of the cylinder I32 passes through the
intial position without any further attention on line IE5, forcing the piston i6’ forward in the
his part. For ?ne work, the throttle valve‘58 cylinder H’. After the piston M’ has bottomed
will be adjusted to allow only a very slow exhaust in the cylinder I i’, the excess ?uid flows through
in order to obtain a very slow travel of the dia
the ducts 96’ and SI’ and connecting ducts into
monds across the face-of the grinding wheel. the line I56 and thence through the .duct 88
But the slowness of their movement does not and duct 96 into the cylinder II, forcing the
40 interfere with the work of the operator. ‘He can piston '14 rearwardly in‘this cylinder. After the
attend to other duties. Even if he has only ‘one piston I4 has bottomed in the rear end of the
machine to operate, the use of the dressing cylinder II, the excess ?uid will pass off through
mechanism disclosed in Figure 2 will ‘render him the duct I68, valve 169 and ducts 1.6,‘! and 166
more efficient for during the dressing interval, into the line I46, whence it will return through
he can remove a completed workpiece and chuck the reverse ‘and throttle valves to the sump.
a new blank in place on the grinding machine.
When the dressing mechanism is arranged .to
Where only the sides of a grinding wheel are provide a dwell at the end of the stroke .of the
to be dressed, the diamonds ,need only be moved side-trimming .diamond as described, the dia
across the grinding wheel in one direction far mond25 will be carried across the side .I6'I of the
enough to dress the side for the full length and wheel W and when the piston I4 has ‘bottomed
may then be returned to initial position. When in the forward end of the cylinder II, the tip
it is desired to dress the tip of the grinding wheel tnimming tool 28 will engage the tip surface 116
also and the tip dressing tool is mounted .on the of the wheel. The tipetrimming tool 28 will re
same support with one of the side truing tools, main in engagement with the wheel until the
as is the tool 28 of Figure 2, then a dwell must piston ‘I35_<has moved fully over to the right and
occur at the end of the forward stroke of the pis tripped the reverse valve. Thush depending upon
ton I4 and this dwell must be of suflicient dura the dimensions of the cylinder E32, the tip-trim
tion to permit the tip of the wheel to be dressed. ming tool .28 .can be caused to remain in engage
To secure this dwell, the cylinder I32 is made ment with :the tip of the grinding wheel for more
60 longer than the cylinders II or .I I’ if the three or less time, as may be required, to true the tip
cylinders are .of the same diameter. Thus, after surface of the wheel satisfactorily.
the pistons i6 and i4’ have bottomed in their
Preferably, the diamond 25 and truing tool 28
respective cylinders at the ends of their strokes,
the piston I35 will still have to travel some dis.
be spaced far enough apart to ‘allow the dia
mond 25 to clear the side I6! of the wheel before
tance before the piston rod I36 engages the disc the truing tool 28~actually engages the tip sur
I 38 and trips the reverse valve. The distance. of face ITIIl of the wheel;
this overtravel of the piston I35 determines the
The tip-truing tool 26 may be made ‘of any
length of the dwell of the tip-dresser 2.8 in one desired shape. If the tip surface I'éI of the wheel
gagement with the grinding wheel. .
Where the piston @353 ‘has this-overtravel, a
greater volume of ‘fluid is required to move the
piston to either end of the cylinder I32 than
can be contained in either‘the cylinder 14 or .II’.
To insure that the piston I35 .‘be moved in .‘both
directions to the full extent of the stroke, a sec
is ‘to ‘be inclined at other than a right angle to
the axis N2 of the grinding wheel, a conical .tru
ing tool such as shown as '26 is preferred. When
the tip surface of the wheel
perpendicular to
its axis,l,a cylindricalrtip truing gtool might be
substituted for the conical tool .28 and ,used di
rectly in place of the tool.28. As stated, how
, 8
ever, the shape of the tip truing tool may be that shown at 28. It will be obvious, also, that
chosen at will to serve the purpose for which it instead of using two dressing'units, one of which
carries both a side and a tip-trimming tool, that
is intended.
In Figures 1 and 2,, the dressers are shown three dressing units might’be coupled together,
coupled together to move simultaneously in op where it is desired to use a reciprocating trim
posite directions. Figure 3 shows diagrammati ming tool for the tip as well as the side surfaces
cally how they might be coupled together to of a wheel. The three ‘units could be operated
move simultaneously in the same direction. The from ' one reverse and one throttle valve and
same reference numerals heretofore used are
might be identical in construction.
employed in Figure 3 to designate like parts.
Certain features of the invention will have Wide
" When the pressure ?uid is ?owing through the applications and are not limited to use in dressing
line il'5, the piston I4’ is forced to the rear in mechanisms. In general it may be said that the
the cylinder H’ and the fluid in the rear end of present application is intended to cover any
this cylinder is forced out through the line I16 adaptations, uses, orembodiments of the inven
into the fcrward'end of the cylinder ll. This tion, following, in general, the principles of the
forces the piston M also rearwardly in its cylin invention and including such departures from the
der 5 l. The fluid forced out of the rear end of the present disclosure as ' come within known or
cylinder ii passes through the line H'i into the customary practice in the art to which the inven
rear end of the cylinder l 32, forcing the piston l35 tion pertains and'as may be applied to the essen
to the right to trip the reverse valve. As soon as tial features hereinbefore set forth and as fall
the reverse alvev is'shifted, the pressure fluid within the scope of the invention or the limits of
will flow through the line ill, forcing the piston the appended claims.
M forwardin the cylinder II and driving the, . Having thus described our invention, what we
fluid in the forward end of this cylinder through claim is:
‘ >
the line 5'55 into the rear end of the cylinder H’.
1. In ‘a dressing mechanism for a grinding
The fluid in the forward end of this cylinder is wheel, a reciprocable member, a dressing 'tool
then forced through the line H5, the reverse and mounted on said member for dressing a side sur
. throttle valves into the line leading’ back to the
face of the wheel, a dressing tool mounted on said
member for dressing the tip surface of said wheel,
The diamonds 25 and 25’ move forward to~
'gether and rearwardly together when the units
and the reverse valve are coupled as shown in
Figure 3. The only change required to achieve
this result is a change in the coupling of the con
necting pipe lines.
said dressing tools being spaced from one ‘an 30
other‘ to allow the side dresser to complete its
stroke before the tip dresser engages the wheel,
and means for actuating said reciprocable mem
ber to cause it to move alternately in opposite
directions with a dwell at the end of its stroke’ 35
in one direction when the tip dresser is in engage
'ZnjFigure ‘3, only one set of ball-check valves
has been shown for“ the sake of clearness, but meet with the wheel.
it will be understood that if it is desired to ob
tain a dwell of the trip-trimming tool 28' in
40 engagement with the grinding wheel, then a
second set of ball-check valves should be pro
vided to operate in exactly the same manner as
, the second set used in the mechanism of Figure 2.
When two dresser units are coupled together as
7 2., ‘In a dressing mechanism for grinding wheels,
a reciprocable member, a dressing tool mounted
on said'memberfor dressing a side surface of the ,40
wheel, a dressing tool mounted on said member
for dressing the tip surface of the wheel, said tip
dresser being spaced from said side dresser far
enough to allow the side dresser to complete its
suggested in‘Figure 1, the relief valve 6! in the stroke vbefore the tip dresser engages the wheel,
exhaust duct '55 of the valve~stem 35 is not re
means movable in opposite directions for moving
the reciprocable member correspondingly in 0p-'
and l 1i’ are connected together and the difference posite directions, said last named means being.
' quired.
The front ends of the two pistons M
in pressure on the front and rear faces of each
piston is the same whether the piston be moving
to the right or the left. Hence each diamond will
V be moved at the same rate in one direction as in
the other.
Where a pair of dresser units are
connected, however, with a thirdpiston, as the
piston E35 of Figure 2, which‘ itself has different
effective areas on its two faces, the relief valve
iii is required if the two diamonds are to move
at the same rates in'opposite directions.
dirference in area between the front and rear
60, faces of the piston I35 constitutes an unbalanced
'condition‘which must be offset by the action of
manually operable in one direction to bring the
two dressing tools successively into engagement
with the grinding wheel, and means for auto
matically moving said means in the opposite
direction after a dwell of the tip dressing tool
in engagement with the wheel.
3. In combination, a support having a longi~
tudinal bore formed eccentrically therein and
having a longitudinal groove formed in its periph
ery at the point most remote from the center of
said bore, a member shaped to fit said bore and
reciprocable therein, a projecting member secured
to said reciprocable member, and means carried
the relief. valve 6 I .
by said ‘projecting member adapted to engage in
No particular mounting for the truing units, the groove of said support to guide said recipro
and the reverse valve has been shown in any of cable member in its movements in the bore of said
the drawings, but it will be understood thatthey support.
may be mounted in any suitable way and at any
convenient location upon the grinding machine
with which the truing units are to be used. It
will be further understood that; while the
diamonds 25 and 25', have been referred to as'
4. In combination, a support of cylindrical
shape having a cylindrical bore formed eccentri
cally therein and having a longitudinal groove
formed in its periphery at the point most remote
from the center of said bore, a cylindrical mem- P
side-trimming tools, one or other of them might, ber reciprocable in' said bore and having a sleeve
if desired, be used to dress the tip of a grinding
wheel by a, reciprocating movement across the
tip surface of the rotating wheel, in case it was
75 not desired to use a tip-trimming tool similar to
secured thereto to surround said support, and a
tongue carried by said sleeve adapted to engage
in the peripheral groove of said support to guide
said reciprocable member‘ in' its, movements.
5. In combination, a support having a cylinder
formed therein and having a cylindrical guide
projecting from one end of said'cylinder, said
guide having a longitudinal cylindrical bore
formed therein eccentrically of the periphery of
said guide and having a longitudinal groove‘
formed in its periphery at the point most remote
from the center of said bore, a piston recipro
cable in said cylinder, a piston-rod secured to said
10 piston and. projecting from said cylinder through
pressure to said ‘piston, a second cylinder anda
second ‘piston reciprocable- therein, a plunger
mounted in alignment with the second piston and
spaced therefrom to be positively movable there
byafter a predetermined movement of the second
piston in one direction, a duct connecting one end
of the ?rst piston to the reverse valve, a second
duct connecting the» other end of the ?rst piston
toone end of the second piston to move said
second piston into engagement with the plunger 10
the bore of said guide, a sleeve secured to the on movement of ‘the ?rst piston in one direction
outer end or said piston-rod to surround said in its cylinder, a duct connecting the opposite side
guide, a tongue secured ‘to the interior of said of the second piston ‘with the reverse valve, said
sleeve adapted to engage in a groove of said guide, reverse valve in its movement connecting the ?rst
a dressing tool secured to said piston-rod, and and third ducts alternately with fluid pressure 15
means for admitting ?uid pressure alternately to supply and exhaust, means operatively connecting
opposite sides of said piston to reciprocate said the ‘reverse valve andplunger to move one on
dressing tool.
6. In combination, a pair of cylinders and a pis
20 ton reciprocable in each cylinder, a reverse valve
controlling the direction of application of ?uid
pressure to said pistons, a duct connecting the
movementiof the other, means for resiliently hold
ing the reverse valve, at either limit of its move
ment, said last named means being disengageable 20
in one direction on positive movement of the
plunger and a coil spring interposed between the
reverse valve with one end of one cylinder, a duct second piston and the plunger and adapted to be
connecting the other end of saidcylinder with one compressed on movement of the second piston
end of the other cylinder, means for moving the into engagement with’the plunger and operable to 25
reverse valve manually in one direction, means shift the reverse valv'e‘through movement of said
for moving the reverse valve in the opposite direc plunger after the resilient holding means has been
tion, and a duct connecting the second end of the disengaged.
second cylinder with the last named means to
and a piston
30 apply fluid pressure to the last named means to
reciprocable therein, a reciprocable valve for
operate the same on movement of the piston in ‘controlling the direction‘ of application of fluid
one direction in the second cylinder‘.
pressure to said piston, a second cylinder and
'1. In combination, a support, a tubular mem‘ a second piston reciprocable therein, a plunger
her having one end closed and adapted to slide mounted in alignment with the second piston
telescopically on said support, a guard secured and spaced therefrom to be positively movable 35
to said support and surrounding said tubular thereby after predetermined movement of the
member, a valve carried by said support connect second piston in one direction, a duct connect
ing with the outside air and adapted to be opened ing one end of ‘thei‘?rst piston to the reverse
when the tubular member is moved outwardly on valve, a second duct connecting the other end
said support to admit air between the relatively of the ?rst'piston to one end of the second pis
telescoping members and adapted to be closed on ton to move the second piston into engagement
reverse movement of said members, and means with the plunger on movement of the ?rst piston
for reciprocating the tubular member on said in-one direction in its cylinder, a duct connecting
the opposite'iside of the ‘secondpiston with the
8. In combination, a cylinder and a piston re
ciprocable therein, a reverse valve havingia lon
reverse‘valve, auxiliaryducts connecting each of 45
the ?rst ducts with the‘ ?rst ‘cylinder at points
gitudinal bore therein, supply and exhaust ducts intermediate the length of said cylinder, a check
leading to said valve, one of which connects with valve’ cooperating ‘ with each of the auxiliary
said bore, a throttle valve controlling the flow of ducts‘to close the same against flow of ?uid
fluid from said. here to the duct that connects therethrough into said cylinder but permitting
therewith, a stop member limiting the opening ?owof fluid ‘from said cylinder, a pivoted lever
of said throttle valve and having-a threaded con
operatively connected at one end to the reverse
nection with said reverse valve, means for hold
Valve'and on'its opposite end to said plunger, said
ing the last named member, against rotation, reverse valve in its movement connecting the
means connecting the reverse valve with opposite ?rst and thirdnamed ducts alternately with sup 55
ends of said cylinder, said reverse valve being ply‘and-exhaust lines, means'for resiliently hold
reciprocable to apply fluid pressure alternately to ing the reverse valve at either limit of its move
opposite ends of said piston, and said reverse ment, said means being disengageable in one di
valve being also rotatable to adjust said stop rection on positive movement of the lever by en
60 member.
gagement of said piston with said plunger, and 60
9. In combination, a cylinder and a piston re
a coiled spring interposed between the second
ciprocable therein, a reverse valve for controlling piston and plunger and adapted to be compressed
the direction of application of ?uid pressure to
said piston, a second cylinder and a second piston
reciprocable therein, means for moving the re
verse valve in one direction, means operable by
the second piston, after a predetermined move
ment in its cylinder, for moving the reverse valve
in the opposite direction, and means whereby
movement of the ?rst piston in one direction in
its cylinder operates to move the second piston in
the last described direction in its cylinder.
on movement of the second piston into engage
ment with the plunger to shift the reverse valve
after the resilient holding means has been dis 65
engaged by movement of said lever.
12. In combination, a cylinder and a piston
movable therein, a reverse valve controlling the
movement of said piston, a second cylinder and
a second piston movable therein, a single hy 70
draulic connection from one end of one cylinder
to one end of the other cylinder, hydraulic con
10. In combination, a cylinder and a piston re nections between said reverse valve and the other
ciprocable therein, a reciprocable reverse valve for ends of the two cylinders, the operation of said
controlling the direction of application of fluid valve causing supply and exhaust of the motive 75
?uid alternately through the two last named hy
draulic connections, means for moving said valve,
in one direction, and means whereby when the
second piston has moved a predetermineddis
tance in one direction in its cylinder, the reverse
.valve is reversed.
13. In combination, a cylinder, a piston recip
rocable therein and having a, piston rod project
ing' from one face thereof, a valve casing, a duct
10 connecting the described face of piston with said
casing, a second duct connecting the other face
of the piston'with said casing at a point spaced
from the point of connection of the ?rst duct
therewith, supply and exhaust lines connected
15 to said casing, a reverse valve reciprocable in the
casing to connect the supply and exhaust lines
alternately with said two ducts, and a spring
closed relief valve, and means whereby when the
second, duct is connected to supply, said relief
20 valve is interposed between the ?rst duct and the
operable means for moving said valve in one di
motion to admit the pressure ?uid to one end of
said cylinder to move the piston in one direction,
a second cylinder into which ?uid flows from the
opposite end of the ?rst named cylinder as the
piston moves therein in the described direction,
a piston reciprocable in the second cylinder, and
means operatively connecting the secondpiston
to said valve to reverse said valve after a prede
termined dwell of the ?rst piston at the end of 10
its movement in the described direction.
1'7. In combination, a cylinder, a piston re
ciprocable therein, a reciprocable valve for com
trolling‘ the application of fluid pressure alter
nately to opposite ends of the piston, manually 15
operable means for moving the valve in one di-.
rection to admit the pressure fluid to one end of
said cylinder to move the piston in one direc-'
tion, a second cylinder and a second piston re
ciprocable therein, means operatively connect
ing the second piston to said valve so that one
is against the resistance of the spring operating moves the other, said last named means operating
to move the second piston in one direction in the
said relief valve.
ill. In combination, a cylinder, a piston recip—' second cylinder on the above manual movement 7
rocable therein, a reciprocable valve for control of the valve, and means connecting the second 25
exhaust line so that exhaust from the ?rst duct
ling the application of ?uid-pressure alternately cylinder with the end of the ?rst cylinder which
to opposite ends of the piston, manually operable is on exhaust during movement of the ?rst piston
means for moving the valve in one direction to
admit the pressure ?uid to one'end of the cyl
30 inder to move the piston in one direction, and
means whereby the ?uid ?owing from the other
end of said cylinder during said movement causes
said valve to be reversed, after a predetermined
dwell of the piston at the end of its movement
35: in the ?rst-mentioned direction, to reverse the
movement of said piston.
15. In combination, a cylinder, apiston re
ciprocable therein, a reciprocable valve for con
trolling the application of fluid pressure alter
40 nately to opposite ends of the piston, a second
cylinder, a piston reciprocable in said second cyl
inder, manually operable means for moving the
valve in one direction, means connecting the sec
ond piston to said valve to move the valve in the
45 reverse direction on movement of the second
piston in one direction in its cylinder, and, means
connecting one end of the ?rst piston with one
end of the second piston to move the second pis
ton in the described direction at the end of the
50 movement of the ?rst piston in its cylinder in the
direction to which it is impelled on manual move
ment of the valve.
16. In combination, a cylinder, a piston re
ciprocable therein, a reciprocable valve for con
55 trolling the application of fluid pressure alter
nately to opposite ends of the piston, manually
in the described direction, whereby to move the
second piston in a direction to automatically re
verse said valve.
18. In combination, a cylinder, a piston ire
ciprocable therein, a reciprocable valve control
ling the application of ?uid pressure alternately
to opposite ends of the piston, manually operable
means for moving the valve in one direction to 35
admit the pressure ?uid to one end of said cylin~
der to move the piston in one direction, a second
cylinder and a second piston reciprocable therein,
means operatively connecting the second piston
to said valve so that one moves the other, said
last named means operating to move the second,
piston in one direction in its cylinder on the
above described manual movement of the valve,
the volumetric capacity of the second cylinder
being greater than that of the ?rst, means con
necting the second cylinder with the end of the
?rst cylinder which is on exhaust during move
ment of the ?rst piston in the described direction,
and means also connecting the pressure end of
the ?rst cylinder with the second cylinder after
the ?rst piston has bottomed in its cylinder on its
?rst described movement, whereby to supply to
the second cylinder the volume of the motive
?uid required to automatically reverse said valve.
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