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July 5, 1949.
2,475,401
v. .1. PRINCE
MACHINE FOR REGRINDING WORN CRANKSHAFTS
'7 Sheets-Sheet 1
Filed Dec. 16, 1946
E61.
Ju?y 5, 1949.,
2,475,401
v. J. PRINCE
MACHINE FOR REGRINDING WORN CRANKSHAFTS
Filed-Dec. 16, 1946
7 Sheets-Sheet 2
llYl/EJVTOE.
.)//c roe J. PE/IVC‘E:
July 5, 1949.
2,475,401
v. J. PRINCE
MACHINE FOR REGRINDING WORN CRANKSHAFTS
Filed Dec. 16, 1946
7 Sheets-Sheet 3
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July 5, 1949.
2 4, 7 5 4, 0 11
v. J. PRINCE
MACHINE FOR REGRINDING WORN CRANKSHAFTS
Filed Dec. 16, 1946
7 Sheets-Sheet‘ 4
JulyS, 1949.
2,475,401
V. J. PRINCE
MACHINE FOR REGRINDING WORN CRANKSHAFTS
Filed Dec. 16, 1946
7 SheetS-I-Sheet 5
July 5, 1949.
2,475,401
v. J. PRINCE
MACHINE FOR REGRINDING WORN CRANKSHAFTS
Filed Dec. 16, 1946
7 Sheets-Sheet 6
July 5, 1949.
v. J. PRINCE
2,475,401
MACHINE FOR REGRINDING WORN CRANKSHAFTS
Filed Dec. 16, 1946
7 Sheets-Sheet '7
17 6. 1
‘[NVENTOR
Vic for J Prince.
BY 5W4’.
‘ATTORNEY
2,475,401
Patented July 5, 1949
UNITED STATES FATENT OFFICE
2,475,401
MAQEHNE FOR REGRINDING ‘WORN
?RANKSHAFTS
Victor .lolm Prince, Kingston-on-Thames,
England
{application December 16, 1946, Serial .No. 716,484
In Great Britain April 22, .1943
Section 1, Public Law 690, August 8, 1946
Patent expires April 22, 1963
9 Claims. (C1. 51-42)
2
1
This invention relates to machines for regrind
ance with vthe invention, both machines being
ing worn crankshafts in which a grinding wheel
is rotated in contact with the periphery of a big
end journal or crankpin, or shaft ends or journals,
the work beingmoved whilst in contact with the
grinding wheel so that the Whole of the periphery
crankpins for one centering or mounting of the
crankshaft.
In the drawings:
Figure 1 is a sectional side elevation of one
capable of grinding :both .main journals and
form,
of the appropriate part of the work is negotiated.
In existing machines for regrinding crankshafts
the grinding wheel, which usually is considerably
Figure 2 is a front elevation,
Figure 3 is a view similar to Figure 1 of the
second
and preferred .form of the invention,
10
larger in diameter than the work, is mounted
Figure 4 is a front view of the upper part of the
to rotate upon a ?xed aXis so that it is necessary
machine illustrated in Figure 3,
to so set up the work that the actual part, for
Figure 5 is a sectional view of the telescopic
example crankpin being reground must be ro
coupling member used in the machine illustrated
tated on its own axis. Such a method of setting
up is not only tedious and di?icult but, particu 15 in Figures 3 and 4.
Figure 6 is asectional elevation of a preferred
larly when grinding a crankpin, the parts of the
form of tailstock ‘employed in the ‘machine illus~
shaft on its normal axis of rotation, for example,
trated in Figures '3 and 4.
shaft ends and ?anges, tend to bias the work,
Figure '7 is a section on the line -l--’l, Figure 6.
such bias being enhanced by centrifugal force.
Figure
8 is a side view of the grinding wheel
20
Also it is necessary to set up the crankshaft for
trueing attachment.
each set of coaxial crankpins and also it is not
Figure 9 is a section on the line 9-9, Figure 8,
possible to make a speedy change from one
and
crankpin to another.
Figure 10 is arear view of the attachment look
The main object of this invention is to provide
a machine wherein it is unnecessary to set up 25 ing in the direction of the arrow in Figure 8.
Figure 11 is a side view of the :feed screw for
the work for the grinding of each part.
the
grinding Wheel.
An important feature of the invention is that
Like reference numerals indicate like or equiv
instead of mounting the grinding Wheel axis is
?xed bearings, the bearings and consequently the
wheel are mounted so as to be capable of swing
ing movement towards or away from the work,
and means are provided for coupling the wheel
axle to the part being worked in such a manner
that the work itself in the case of a crankp-ln
30
alent parts in the two modi?cations.
Referring to the drawings, the machine frame
I is provided with a bench plate 2 similar to
that of a lathe with a headstock ,3 at one end
and a tailstock 4 at the other end with chuck
to and rolling centre ‘5 mounted relatively ad
will impart a swinging movement to the grind 35 J'ustably on a sliding carriage 6 adapted to be
traversed on a slide 1 of the ‘plate 2 by a rack
ing wheel which results in the periphery of said
3 and a pinion 9 driven by a‘handwheel l8. A
wheel always being maintained a ?xed distance
small horsepower, for example half horsepower
from the crankpin axis although the endless path
three phase electric motor ll, with a suitable
generated by the points of contact of the grind
ing wheel and work is not concentric with the 40 reduction gear, drives the chuck shaft via a four
speed belt and pulley or other suitable variable
axis of rotation of the work. This is preferably
speed transmission device [2.
achieved by coupling the wheel axis to the crank
The grinding wheel is indicated by the refer
pin by a link, which link has means such as a
ence numeral I3, and adistinctive feature of the
bifurcated yoke at its end to embrace the pin.
It is to be understood that suitable means 45 invention is that a crankshaft .can be set up
normally centred by the chuck 4a and rolling
for making necessary adjustments, for example,
centrei so that it can ‘be rotated about its nor
to close up accurately the grinding wheel periph~
mal axis for grinding both its .main journals
cry towards the work axis will be provided.
supported .truly coaxial with the axis .of rotation
The accompanying drawings illustrate two pre
ferred forms of machine constructed in accord- - of the shaft and its crankpins or journals oc
3
2,475,401
cupying their normal throw or radially spaced
positions relatively to the normal axis of the
shaft. For this purpose, instead of mounting the
grinding wheel shaft M in ?xed bearings, such
bearings are housed in the upper ends of two
parallel side arms l5 constituting the bifurcated
upper part of a substantially vertical beam l6
pivoted between its ends by a pivot pin or coaxial
lateral lugs l'l journalled in bearers l8 ?xed to the
toggle and at the other end to a handle or treadle,
conveniently accessible to the operator.
For grinding a big end journal or crankpin,
means is provided to maintain the work at a
correct relative distance from the axis of the
grinding wheel, the beam l6 being disconnected
from the nut 23 so that it is free to oscillate un
der the control of the work. Such means com
prises a pair of arms 33 radiating from and sup
bench plate 2.
ported loosely upon the grinding wheel shaft by
The lower end of this oscillatable beam is
cranked inverted L fashion as at l9 to accommo
date a motor, for example a three horsepower
bearings and cranked downwardly as at 36a to
wards the work substantially in continuity with
the periphery of the customary guard 31. The
three phase electric motor 20' secured to the
vertical limb of such cranked part of the beam
free ends of these cranked extensions 35a are
?tted with steel parallel guide bars 38 for a steel
by any suitable means such as, for example, a
sliding ?nger 39 which is adjustable translatively
selectively to said guide bars by a feed screw 40
operated by a hand wheel 4i supported by a
bracket 42 joining the free ends of the said
cranked extensions 36a of the arms 35. The arms
36 thus form a link connection between the work
and the axis of the grinding wheel so as to op
when the crank pins or journals of the crank
shaft are being ground.
pose any tendency of the work to vibrate or
When the main journals of the shaft are to be . bounce relatively to the wheel or vice versa.
ground the position of the grinding wheel axis 1" The size to which the crankpin 44 is to be ground
is regulated by the handwheel 4| which can be
is carefully selected by the operator, but when a
manipulated whilst the grinding is in progress
crankpin is being ground, the work itself im
as likewise can be the handwheel 26 for adjust~
parts such movement to the grinding wheel as
ing the grinding wheel relatively to the work.
will ensure the whole perimeter of the appro
Both of these handwheels can be graduated to af
priate crankpin being ground properly. although
ford a rough measurement of the adjustment,
the endless path generated by the points of con
the actual measurement of the work being by
tact of the grinding wheel and the work is not
means of a hand gauge.
concentric with the axis of rotation of the
The work, indicated in Figure 1 by broken
crankshaft.
'
lines 43 as a crankpin 44 is engaged between the
The means by which the operator controls and
guide bars 38 and the ?nger 39, the ?nger 39 hav
selects the position of the grinding wheel axis
ing an inclined work-engaging lower edge 39a
provides for quick and ?ne adjustments and com
which forms substantially a V with the lower
prises a feed screw 22 receiving a nut 23 adapted
parts
of the guide bars 38 (as shown in Figure
to be traversed along the feed screw 22 for quick
1) to engage wide angle spaced points, for ex
adjustments by the rotation of a small handwheel
ample 120° apart of the work, whilst the lower
24 and a sleeve 25 loose upon the unthreaded end
extremities of the said guide bars are bevelled
of the feed screw 22 and rotated by a large hand
steel band 2| tensioned about the motor hous
ing and anchored to such vertical limb. By this
means, the grinding wheel aXis can be traversed
substantially perpendicularly or radially rela
tively to the chuck axis, this condition occurring
wheel 26 to traverse such sleeve axially through
as at 38a so that they can almost contact with
the grinding wheel in close proximity to the ac
tual grinding zone. The inclination of the work
engaging edges of the guide bars is such as to
The sleeve 25 imparts translative movements to
form
an obtuse angle with the tangent common
the feed screw 22 through the medium of thrust
to the work and grinding wheel, and consequently
bearings 30.
it will be soon by reference to Figure 1 of the
The nut 23 on the feed screw 22 is formed with 60 drawings that the work is ?rmly engaged at
a depending lug 23a guided in a channel 3la of
three points. By such means the work is main
a ?xed inclined guide arm or ramp 3|, the lug 23a
tained in constant effective engagement with the
carrying a roller 23b running upon the base of
grinding wheel, and the grinding wheel axis oscil
the said channel.
lates in conformity with the endless path gen~
The beam I6 is readily detachably coupled to
erated by the point of contact between wheel
this nut 23, and such connection is effected by a
and work.
toggle or latch 32, pivoted at one end to the lower
A guard plate or deflector 45 is ?xed to the
end of the beam l6, its free end being formed
beam {6 just above the fulcrum of the beam to
with a depending lug 3211 which is urged by a
deflect metal particles on to the plate 2 which
torsion spring 33 into a recess 230 of the nut 23. 60 otherwise might fall down to the motor 20.
It will be appreciated that when the lug 32a is
Referring now to the form of machine illus
engaged in the nut 23, translative movement im
trated in Figures 3 and 4, the essential details fol—
parted to such nut will transmit angular adjust
low closely on those illustrated in Figures 1 and
ment to the beam to vary the pressure of the
2, the machine in Figures 3 and 4 having been
grinding wheel against the work, for example for
designed with a view to simpli?ed operation, ro
grinding a main journal of a crankshaft.
bust and rigid construction and the production
The grinding wheel shaft l4 and the shaft of
of work with a high degree of accuracy, without
the motor 20 are connected by belts 34 passed
employing a highly skilled operator. Like refer
over pulleys [4a and 20a respectively on such
ence numerals on the same or equivalent parts
shafts so that the grinding wheel is permanently 70 in the two forms of machine have been used.
coupled to the motor 20.
From Figures 3 and 4 it will be seen that a
The latch 01' toggle 32 is operated by any suit
rigid control post 46 is mounted on the frame and
able remote control device for disengaging its
that the grinding wheel assembly is coupled
lug 32a from the nut 23, for example by means of
thereto by means of a telescopic connector 41
a Bowden cable 35 connected at one end to the 75 later described in detail. This connector allows
a split nut 21 supported within a bracket 28
?xed to the front panel 29 of the machine frame.
2,475,401
d
ii
trigger 51 is a link 62, the other end of which
carries a wedge member 63, co-operating with an
inclined plane 64, the upper surface of the wedge
worl; on a crankpin. The head
houses feed
carrying the serrated faced block 65, which mates
screw, the movement of which is o‘otaned by the
two hand wheels 2d and 25, the feed screw receiv CA with the rack 5|. The upper end of the ?nger
51a, is notched so that when the trigger 51 and
ing a nut which carries a ball head 43 projecting
stock Bl are squeezed the said trigger fulcrums
from the head. The hand wheel as turns the
about the notch. This retracts the link allow
screw directly to cause rotation of the feed screw
ing the block 65 to drop so that the sleeve 53 can
resulting in fore and aft movement of the ball
now move axially with respect to the rod.
head it, which movement is transmitted to the
The above arrangement provides a very ready
grinding wheel assembly through the connecting
and rigid engage and release coupling between
member 47 enabling the operator to move the
the grinding wheel assembly and the control
wheel in relation to the work when grinding main
post. Moreover, it allows for rapid initial ad
bearings.
by which the
The operator
hollow head
controls
58 houses
and selects
the me the
justment of the grinding wheel. periphery with
respect to the work when grinding main bear
position of the grinding wheel axis when grind
ings.
ing main journals, and as shown in Figure 11,
Referring now to Figures 6 and 7, there is illus
said means comprise the feed screw 22, the move
trated in front and side section respectively a
ment of which is obtained by the two hand wheels
preferred and novel form of tailstoclz. The tail—
stock illustrated is controlled by a single lever
24
moving
which
and carries
25,
on the
a slide
feed
a depending
Riot,
screw
which
22 guide
-eceiving
guidemember
carries
a nut the
for the easy release of the grinding Wheel assem“
bly from the control post when it is desired to
which serves the dual purpose of clamping or
ball
headhead
fill. it
The
projecting
hand wheel
through
25 turns
a slot
thethrough
feed screw
22 directly to cause rotation of
said feed
resulting in fore and aft movement of
ball
head All, which movement is transmitted to the
grinding wheel assembly through the connectyo
the member
wheel in 4'!
relation
enabling
to the
the were
operator
whento grin-7b
l
ing main bearings. The wheel it is coupled ‘oy
means of a worm drive, the wheel 2i of which
releasing the tailstock on the bed, and of apply
ing load to the rolling centre when the work is
- . set up. The load is of importance when grind
ing crankshafts, and the actual load is deter~
mined by the design of the tailstock and is not
left to the skill of the operator.
The main casting or hollow housing 66 is shaped
30 to embrace at its bottom the slide 7. Pivoting
on the bar or lever 61 is the locking member 68,
which member has a nose part 69 beneath which
engages one end of the lever El rockable on the
is
around
seen ainfine
Figure
threaded
11, and
A artthreaded.
on the feed
sleeve"'"w
cross bar ‘H.
so that a ?ne adjustment
Tie
on a cross pin 73 and has a cam ‘it thereon which
actual quick and fine adjusting mechanism fol
lows conventional practice. The turning of the
and 15. The operating lever '12 extends through
obtained.
wheel 2% results in axial movement of the screw
22.
However, the hand v
e1 25 may move with
respect to a suitably calibrated sc°‘e on a fixed
part around its periph. . so that the operator
work to fine limits with the riinimun'l use oi
amicroineter. For instan - ,.' '
ter amicrometer
check it is necessary to remove .001. inch from
a main bearing, this can be do
by the use of
the fine adjustment scale, the l rometer being
used only for the ?nal check.
It will be seen that the motor Eli is carried by
the beam it below the swim
u
ii and serves
The operating lever 12 is pivoted
cam is formed to contact with both levers ii?
ajustable
slot inby
themeans
housing
of the
66. bolt
Theand
lever
socket
15 ispivot
arrangement 76, and the upper end of said lever
‘l5 engages within a slot ‘ii in the centre sleeve
18. This centre sleeve is urged forwardly
means of the spring ‘it.
In ‘using the tailstock, the operator raises the
hand lever '12 and this ?rstl Y pivots the lever “.15
so that the centre sleeve is moved axially against
the spring to release the work. Further upward
movement of the lever ‘52 releases the tailstocl'.
on its slide. Downward movement firstly locks
the
tailstock to the bed, and then releases the
50
spring which moves the centre sleeve forwe
to counterbalance the grinding wheel, whilst the
grinding wheel assembly is held rigidly on the
upper part of the control pest, resulting in an
.
Thus, by a simple operation, without the use of
moved
spanners
to position,
or other and
tools,
thethe
loadtailstocl;
on the work
can is
extremely rigid construction.
always constant as determined by the spring 79.
It will be appreciated that with either of the
Figure 5 is a sectional view of the telescopic
conning member. This ccmprims an inner rod
member Evil having a
o
part 55, the
face
modi?cations
to be trued
it up
is necesMry
accuro
for
andthe
forwheelplane
one end of the rod being cou ' d to a hollow mem~
her 52 in which the ball
til received. The
of
oi’ the
the grinding
surface to
wheel.
be dec ‘ parallel
h a wheel
with
trueing
the de
rod Ell telescopes in the sleeve 53 and is prevented 60
vice
is
indicated
generally
.Ll’l
Figure
3
by
the reffrom rotation by the screw
within the spline
erence numeral 10 and its essential constructional
55 in the rod
The sleeve
has a pair of
features are shown in Figures 8, 9 and 10. The
flanges one of which
shown in the draw~
device consists of a diamond dd mounted in a
ing, and between these ?anges two ?nger trig
carrier 8! which carrier can be moved axially
gers El, 5% are mounted, the lingers of which
by
the knurled nut
Turning with the nut is
(tie and 5% respectively) project into hous
a notched bush 83, and spring pressed plunger
84 contacts therewith. The arrangement is such.
urged
ings within
apart by
thethe
sleeve
coil spring
end. The
558. ?ngers
that for each movement of the plunger from one
notch to the next, the diamond is advanced or
retarded a ?xed part c.
0.001 part of an inch.
The assembly is shaped to be mounted in the
Secured to the grinding wheel guard is a pro~
jecting
sembly ball
is released
head '
and
1m the
the control
grinding
post
wheel
merely
by squeezing he ‘tr
and stock 65, thereby releasing the ball. ‘he other trigger 5'.’ allows
for a coarse adjustment of the position of the
grinding wheel on its
Pivoted to the said
dovetail slideway
and is coupled to
member at‘, which is threaded
CH
nut
the screw rod
E7, which rod is turned. by the hand wheel 35.
2,475,401..
7
When it is necessary to true up the grinding
wheel, the hand wheel 88 is rotated to bring the
diamond carrier and assembly to the limit in
one direction and the knurled nut moved so
that the diamond is advanced one step.
Then
with the grinding wheel rotating, the hand wheel
88 is turned so that the diamond slowly traverses
the grinding surface.
It will be understood that the initial setting
8
3. A machine for grinding and regrinding
crankshafts comprising a machine frame and
bed, means to support the work for rotation
about its normal axis of rotation, a grinding wheel
mounted on a beam above the machine bed, said
beam being mounted to swing towards or away
from the work, a rigid control post upstanding
from the machine bed and adjacent the grinding
wheel assembly, with means to couple the said
up of the wheel trueing device must be under 1O assembly to, or release same from, the post or
taken so that this traversing movement maintains
support, said coupling means comprising a tele~
the diamond dead parallel with the grinding
wheel axis. To achieve this, a wedge plate 89 is
mounted between the attachment and the grind
ing wheel cover, said plate having arcuate slots
99 therethrough, through which pass the bolts
95, which serve to secure the attachment to the
cover. It will be seen that by loosening off the
bolts 8! and rotating the plate 69 slightly, and
scoping member having means for quickly releas
ing its one end from either the post or the grind-
ing wheel assembly and manually controlled
means whereby the overall length of the said
member can be varied to provide a rapid means
for setting up initially the grinding wheel with
respect to the work surface when grinding main
and a manually controlled feed screw
then tightening the bolts, the linear path of 20 journals,
device associated with the post or support and
travel with respect to the axis of the grinding
connected to the coupling means, which feed
wheel can be altered. This adjustment is in
screw serves to effect the adjustment of the posi
tended for initial setting, as when the path has
tion of the grinding wheel axis.
been accurately adjusted, with normal use no
4. In a machine for grinding and regrinding
further setting will be necessary.
crankshafts, the combination comprising a frame,
Instead of using a variable speed transmission
means carried by said frame to support the work
device employing a belt and pulley arrangement
for rotation about its normal axis both for grind
as shown in Figure 2, a device of known form hav
ing main journals concentric with said axis and
ing a hand control lever l2a moving through an
for crank journals having their normal throw
arc as shown in Figure 4 may be used, the speed
whilst being ground, a grinding wheel, means for
being in?nitely variable between maximum and
mounting said wheel swingably carried by said
minimum speeds.
frame, means for driving said wheel and urging
I claim:
said wheel mounting means to vertical position,
1. A machine for grinding and regrinding
and means adjustable along a ?xed axis and con
crankshafts comprising a machine frame and
nectible to said wheel mounting means for hold
bed, means to support the work for rotation about
its normal axis of rotation, a grinding wheel
mounted on a beam above the machine bed, said
beam being mounted to swing towards or away
from the work, adjustable and detachable cou
pling means for connecting the beam to a ?xed
part of the machine, said coupling means con
necting the grinding wheel beam to a nut, a
manually controlled rotatable feed screw to trav
erse said nut, supporting means for said feed
screw to allow axial movement of said screw, and
a second feed screw device to move said nut
traversing feed screw axially and crankpin en
gaging means carried by the swinging beam,
which crankpin engaging means are adjustable
to different diameters and throws of crankpins
and serve to maintain the work pressed against
ing same in a predetermined position.
5. In a machine for grinding and regrinding
crankshafts, the combination comprising a frame,
means carried by said frame to support the work
for rotation about its normal axis both for grind~
ing main journals concentric with said axis and
for crank journals having their normal throw
whilst being ground, a grinding wheel, means
for mounting said wheel swingably carried by
said frame, means for driving said wheel and
urging said wheel mounting means to vertical
position, means mounted for limited rotation on
the shaft of said. wheel for holding a crank
journal adjacent said wheel, and adjustable
means connectible to said wheel mounting means
for holding same in a predetermined position.
6. In a machine for grinding and regrinding
crankshafts, the combination comprising a frame,
means carried by said frame to support the work
for rotation about its normal axis both for grind
crankshafts comprising a machine frame and
ing main journals concentric with said axis and
bed, means to support the work for rotation about
for crank journals having their normal throw
its normal axis of rotation, a grinding wheel
whilst being ground, a grinding wheel, means for
mounted on a beam above the machine bed, said
mounting said wheel swingably carried by said
beam being mounted to swing towards or away 60 frame, means for driving said wheel and urging
from the work, a rigid control post upstanding
said wheel mounting means to vertical position,
from the machine bed and adjacent the grinding
means mounted for limited rotation on the shaft
wheel assembly, with means to couple the said
of said wheel for holding crank journals of dif
assembly to, or release same from, the post or
ferent diameters adjacent said Wheel, and ad
support and a manually controlled feed screw 65 justable means connectible to said wheel mount
device associated with the post or support and
ing means for holding same in a predetermined
connected to the coupling means, which feed
position.
screw serves to effect the adjustment of the posi
7. In a machine for grinding and regrinding
tion of the grinding wheel axis and crankpin
crankshafts, the combination comprising a
engaging means carried by the swinging beam,
frame, means carried by said frame to support
which crankpin engaging means are adjustable to
the work for rotation about its normal axis both
different diameters and throws of crankpins and
for grinding main journals concentric with said
serve to maintain the work pressed against the
aixs and for crank journals having their normal
grinding wheel for complete rotation of the
throw whilst being ground, a grinding wheel,
crankshaft.
' means for mounting said wheel swingably carried
the grinding wheel for complete rotation of the
crankshaft.
2. A machine for grinding and regrinding
2,475,401
by said frame, means for driving said wheel and
urging said wheel mounting means to vertical
10
crankshafts, the combination comprising a frame,
means carried by said frame to support the work
for rotation about its normal axis both for grind
ing main journals concentric with said axis and
the shaft of said wheel for holding crank journals
for crank journals having their normal throw
of different diameters adjacent said wheel, said
whilst being ground, a grinding wheel, means for
crank journal holding means including guidingly
mounting said wheel swingably carried by said
related adjustable jaws engaging a crank journal,
frame, means for driving said wheel and urging
and adjustable means connectible to said wheel
said wheel mounting means to vertical position,
mounting means for holding same in a predeter
10 means adjustable along a ?xed axis and connecti
mined position.
ble to said wheel mounting means for holding
8. In a machine for grinding and regrinding
same in a predetermined position, and means for
crankshafts, the combination comprising a frame,
connecting said wheel mounting means to said
means carried by said frame to support the work
adjustable holding means.
for rotation about its normal axis both for grind
VICTOR JOHN PRINCE.
ing main journals concentric with said axis and
for crank journals having their normal throw
REFERENCES CITED
whilst being ground, a grinding wheel, means for
mounting said wheel swingably carried by said
The following referenlces are of record in the
frame, means for driving said wheel and urging
?le of this patent:
said wheel mounting means to vertical position, 10
UNITED STATES PATENTS
means mounted for limited rotation on the shaft
of said wheel for holding crank journals of dif
Number
Name
Date
ferent diameters and throws adjacent said wheel,
1,833,602
Batterman et a1. ____ Nov. 24, 1931
and adjustable means connectible to said wheel
1,871,504
Einstein et a1. ____ __ Aug. 16, 1932
position, means mounted for limited rotation on
mounting means for holding same in a predeter
mined position.
9. In a machine for grinding and regrinding
2,071,882
2,340,602
Kremer __________ __ Feb. 23, 1937
Leusch ___________ __ Feb. 1, 1944
2,349,108
Myers ___________ __ May 16, 1944
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