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Dec. 24, 1946.
R. s. PYNE
'Filed Feb. 14, 1945
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627%, »L7/M
Patented Dec. 24, 1946
Roger S. Pyne, Longmeadow, Mass, assignor to
Van Norman Company, Springfield; Mass., a
corporation of Massachusetts
Application February 14, 1945,- Serial No. 577,881
2 Claims.
This invention relates to an improved work
supporting spindle and chuck combination.
More particularly it relates to such combination
for supporting workpieces which are to be ground
or otherwise treated on their outer surfaces.
The principal object of the invention is to pro
vide a more secure gripping of the workpiece, and
in a manner to secure greater accuracy in the
grinding operation. More speciñc objective will
(Cl. 279-2)
A rod 35 extends through bore I'I of the spin
dle and through and‘beyond the fingers 25. Out
wardly of the end of fingers 25 the rod 35 is
formed with a flange 36, the side of the flange
adjacent the end of the fingers being recessed to
provide an annular beveled surface 3'I comple
mentary to the beveled surfaces 2l on the ends
of the iingers. The end of the rod 35 where it
passes through the plate 24 and fingers 26 is re
be made apparent after the disclosure of the in
vention in the following specification.
10 duced in diameter as shown at 38 to provide
In the accompanying drawing, which illustra
Outwardly of ñange 35 the rod is threaded to
proper space for the distortion of the iingers.
tively discloses the invention embodied in a chuck
for holding the inner race of a ball bearing dur
receive adjustable> lock nuts 9. When a work
piece, such as ball race W, is mounted in the
ing grinding;
15 chuck, as shownv in Fig. 1 a cup shaped mem
Fig. 1 is a plan view of the spindle and chuck
ber 8 is adapted to be inserted between the abut
with parts broken away into axial section;
ment formed by nuts 9 and the workpiece. Mem
Fig. 2 is a fragmentary plan view, on a larger
ber 8 is slotted at 'I to receive the rod 38 and this
scale, of the chuck, parts being shown in sec
slot. is widened at 6 to permit member 8 to pass
20 over flange 36.
Fig. 3 is an end view looking from the right of
The rear end of rod 35 extends outwardly be
Fig. 2;
Fig. 4 is an elevational view of the chuck oper
ating eccentric and its operating handle;
yond pulley I3 and through aligned openings 39
and 40 formed respectively in forked rocker arms
4I'and 4‘2. One end of arm 4I is pivoted at 43
to la bracket 44 secured to one side of housing
Fig. 5 is a similar view of the guiding mecha
nism for the connecting rod through which the
II, the other end being pivoted at 45 to the
eccentric operates;
inner end of a link 45 pivoted at 4l to a hub 48
Fig. 6 is a fragmentary elevational View of the
mounted on a rod 49 secured to the opposite side
outer rocker arm; and
of the housing». Hub 48 is held on the rod 49
Figs. 'l and 8 are respectively plan and eleva 30 by- a set screw 55 in a manner to permit a slight
tional views of the removable work engaging col
rocking of the hub on the rod. One end of arm
42 is pivoted at 5|v to the outer end'of link 45.
Referring to the drawing the work spindle is
The other end of arm 42 is pivoted at 52 to a con
shown at I0 rotatably mounted in a housing II
necting rod 53 which in turn is pivotally con
on ball bearings I2. The spindle is adapted to be i nected at 54 t'o a fork 55 adjustably threaded in
driven by a pulley I3 keyed at I4 to a reduced por
a- collar 56 surrounding an eccentric 5l pivoted
tion I5 of the spindle. A bushing or sleeve I6 is
at 58 to bracket 44. Eccentric 51 is provided
threaded into the bore I'I of the spindle and a
with an operating handle 53. A pin 6l! carried
lock collar I8 is threaded on sleevev IB and se
by the eccentric 5l is adapted to engage stops 6i
cured by machine screws I9 to pulley I3. A set 40 and 62 formed on collar 56'to limit the movement
screw 20 engaging in a recess 2| in the sleeve
of the eccentric within the collar. The con
locks the pulley to the spindle and sleeve.
necting rodV 5ï3‘is provided with a sliding sleeve 63
A circular plate 24 is secured to the end of the
slidably engaging, as best shown in Fig. 5, be
spindle by machine screws 25. Extending out
tween the forked-ends of rocker 4I to give labial
wardly from plate 24 and integral therewith are 45 support to the rod.
a plurality of radially spaced fingers 26. The
Sleeve I6 extends rearwardly through open
free ends of fingers 26 are beveled, on their outer
ing 3€)v in arm 4IY and is formed on its outer
surfaces, as shown at 27, and each is provided
end with a collar 65. A collar 66 is threaded on
adjacent its ends with a headed screw 28, upon
rod 35 and held in adjustable positionv by al set
which, as later described, the ball race to be 50i screw El. A spring 68 positioned between collars
ground is mounted. A plurality of radially posi
65 and 65 tends to retract rod 35. The outer
tioned work engagingmembers 30 are adjustably
side of collar 66 is provided with a thrust bear
mounted in studs 3 I, which extend through open
ing 69 engageable with bosses 18, formed at the
ings 32 in plate 24 and are tapped into the end
sides of opening 4I). Secured to the inner face
of spindle Il),
of collar 65 is one member ‘H of a friction brake,
by a. set screw 16.
stantial, or if desired the major, portion of the
force which resists turning of the race W in the
the opposing member 12 being mounted on pins
13 carried by arm 4|. Member 12 is engageable
by bosses 'i4 formed at the sides of opening 39.
Rearwardly of rocker arm 42, a collar 15 is
threaded on rod 35 and held in adjusted position
chuck during the grinding operation is applied
to the end faces of the race. By distributing the
clamping force between the end faces and the
inner face of the race, distortion of the latter
Collar 15 supports a thrust
by the clamping means during the grinding
operation is effectively eliminated, and a true
and precise shaping of the race-way is obtained.
bearing 11 engageable by rocker arm 42 when
the latter is swung rearwardly about its pivot.
The operation of the chuck is as follows. The
I claim:
work supporting screws 28 are set roughly and l0
1. A chuck comprising a plurality of stiiiiy :ñex
then collectively .ground to a collective diameter
ible fingers arranged in a circular series, means
which is slightly greater than the inside diam
eter of the ball race to be ground.
engaging the ends of said lingers to simultane
The mem
ously flex the fingers toward each other to permit
an annular workpiece to be telescoped thereover,
adjustable members engaging an end face of the
bers 30 are also set so that their 'ends approxi
mately define the desired axial position ofthe
ball race on the surface of the screws 2B and
annular workpiece and defining the position of
so that they will engage the adjacent end surface
the workpiece axially of the fingers, said fingers
of the ball race. The work engaging ends of
when released by said flexing means making a
members 30 are then ground with required accu
stressed engagement'with the inner annular face
racy to the common plane desired.
of the workpiece, a pressure member spring
With the parts positioned as shown in Fig. 2,
pressed' axially of the fingers toward said end
the handle 59 is moved from its normal position
members, and a collar insertable be
A toward position B in Fig. 4. The resulting
tween said pressure member and the opposite
movement of the eccentric pushes rod 53 rear
wardly swinging rocker arm 42 into engagement 25 face of the workpiece to exert an endwise grip
ping force on the workpiece.
with thrust bearing 11 on the end of rod 35. Con
2. A spindle and chuck combination compris
tinued movement of handle 59 to the position
ing a spindle housing, a spindle, having an axial
B defined by stop 6I draws rod 35 rearwardly and
bore therethrough, rotatably mounted in the
beveled surfaces 31 of flange 36 engaging the
a plurality of stiilly flexible fingers
complementary bevels 21 on the fingers 26 draw 30
mounted on the work supporting end of the
the latter toward each other so reducing the
spindle and arranged in a circular series con
collective diameter of the work engaging sur
centric with the bore of the spindle, the outer
faces of the screws 28 that the ball race W may
surface of the free ends of the fingers being
be telescoped over them and positioned firmly
against members 30. Upon return of handle 59 35 beveled toward their ends, a plurality of mem
bers mounted on the work supporting end of
to position A surfaces 31 of flange 36 free the
spindle and arranged in a circular series
ends of the diaphragm fingers 26 permitting the
radially outwardly of the lingers and in con
screw heads 28 to engage the inside of the ball
centric relation therewith, a rod slidably mounted
race under pressure from the stressed fingers.
Handle 59 is now moved in the direction of 40 in the bore of the spindle and extending be
yond'eaoh end thereof, a flange formed on said
position C causing rod 53 to be drawn forwardly
rod outwardly of the ends of the fingers, the face
swinging rocker arm 42 to bring bosses 10 into
of said flange adjacent the fingers being beveled
contact with thrust bearing 69. Following the
radially inward wedging engagement with the
initial contact of arm 42 with bearing 69, arm
42 acts as a lever with its fulcrum at the bosses 45 beveled ends of the fingers, an adjustable abut
ment secured on the rod outwardly of said flange,
10 causing the upper pivot 5| to move rearwardly
a rocker arm pivoted to the spindle housing rear
and by taking up the slight pivotal motion
wardly of the spindle and having an opening
allowed hub 48 on rod 49, as previously described,
through which said rod passes, thrust bearings
draws brake member 12 into contact with mem
ber 1I. Further movement of handle 59 to posi 50 secured to the rod on opposite sides of the rocker
arm, >operating means to swing the rocker arm
tion B moves rod 35 forwardly, against the action
rearwardly against the outer thrust bearing to
of spring 68, to the position shown in dotted lines
move the rod rearwardly and draw said beveled
at the right of Fig. 1 where ample space is
flange into wedging engagement with said fingers
afforded to insert cup member 8 between locked
nuts 9 and the outer end face of the ball race 55 and move the latter radially toward each other
to permit an annular workpiece to be telescoped
W. During the insertion of the cup member
thereover into engagement with said members,
the spindle is held against rotation by brake
said operating means being reversible to engage
the inner thrust bearing and move the rod for
Upon release of handle 59 spring 68 acts to
draw rod 35 rearwardly thus clamping the ball 60 wardly releasing the fingers into a stressed en
gagement with the inner annular face of the
race W between the members 39 and cup mem
workpiece, a .clamping member insertable be
ber 8. Release of handle >59 releases the pull on
tween said abutment and the adjacent end face
rocker arm 42 thus releasing brake 1l-12. After
of the workpiece, and a spring positioned be
completion of the grinding operation the finished
workpiece is released iby moving handle 59 to 65 tween said inner thrust bearing and the spindle
to move said clamping member into engagement
position C, removing cup member ß and then
with the adjacent end face of the workpiece and
moving the handle to position B to again con
exert an endwise gripping force on the work
tract fingers 26 to permit removal of the piece
piecewhen said operating means is released.
from screws 28.
By the arrangement above described a sub
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