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Jan- 7, 1947.
R. s. BEVERLIN
,
2,413,678
WORK-HOLDING MEANS FOR GRINDING MACHINES
Filed July 19, 1945
2 Sheets-Shed; 1
E 02171;’? 5. BEVERLIN
Jan. 7, 1947.
R. s. BE'VERLIN \
'
. 2,413,678 '
WORK-HOLDING MEANS FOR GRINDING MACHINES
Filed July 19, 1945
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HUBERT 5. BBYERLIN
W‘
2,413,678
Patented Jan. 7, 1947
UNITED STATES PATENT OFFICE
2,413,678
WORK-HOLDING MEANS FOR GRINDING
MACHINES
Ohio, assignor to
Robert S. Beverlin, Toledo,
Aerodynamic Research Corporation, Washing
ton, D. 0., a corporation of the District of
Columbia
Application July 19, 1945, Serial No. 605,993
2 Claims. (01. 51-—237)
This invention relates to work-holding means,
and is illustrated in connection with a grinding
machine to hold a Valve in position for grinding
the sleeve 20 and its separable nose piece are
releasably secured together by a spring clip 23
having outwardly projecting radial edge lips en
gaging in internal recesses in the sleeve sections.
or refacing.
An object of .the invention is the provision of a
The rear end of the sleeve 20 is longitudinally
forked as shown in Fig. 4, thus forming an an
nular series of alternate recesses 24 and ?ngers
work-holding ?uid operated means of simple and
ef?cient construction that is quickly operable to
engage or release a work-piece, such, for instance,
as the stem of a tappet Valve, and to ?rmly hold
the engaged work-piece in position to be acted on
whereby to enhance the practicability and oper
ating efficiency of the device.
Further objects and advantages of the inven
tion will be apparent from the following detailed
description, and from the accompanying draw
ings, in which
Fig. l is a perspective view of a valve refacing
machine embodying the invention; Fig. 2 is a
2
29 is moved forward. In the present instance,
25, the ?ngers terminating at their outer ends
in
stepped shoulders 26 for the purpose herein
10
after described.
Mounted in the rear end portion of the sleeve
29 and projecting rearwardly therefrom is a
sleeve 21 shown in detail in Fig. 3, which has an
15 annular ?ange 28 intermediate its ends with
lengthwise extending openings 29 in its base por
tion through which the sleeve ?ngers 25 project
for free longitudinal movements. The sleeve 21,
immediately forward of the ?ange 28, is provided
central vertical longitudinal section of the work
with segmental projections 39 extending through
holding and rotating means of the machine, with 20 the registering recesses 24 of the sleeve 20 and
the collet contracted and holding a work-piece;
Fig. 3 is an enlarged perspective detail of one of
the sleeve members of the work-holding means;
Fig. 4 is an enlarged perspective view of the
threading at their outer ends to the rear inner
end portion of the drive sleeve 12, as shown at 31
in Fig. 8. The two sleeves l2 and 21 are locked
together in threaded engagement by a set-screw
chuck sleeve; Fig. 5 is an enlarged perspective 25 ‘32 threaded into a radial socket 32' in the ?ange
view of the removable front end portion of such
28 and engaging an end notch in the sleeve I2.
sleeve; Fig. 6 is an enlarged perspective view of
For this purpose the base portion of the ?ange 28
the clip for securing the two chuck sleeve sections
is recessed as shown at 33 in Fig. 3, so that it
in assembled relation; Fig. '1 is a perspective view,
partially overhangs the sleeve end. It is thus
30
in expanded form, of a collet used in connection
apparent that the sleeves I2, 20 and 21 turn
with the device, and Fig. 8 is a fragmentary
together with the sleeves l2 and 21 locked against
section similar to Fig. 2, with the chuck sleeve
relative movements and with the sleeve 20
retracted and .the collet in expanded position.
adapted to have limited longitudinal movements
In the drawings, l9 designates a frame head
relative
thereto.
having, in the present instance, a horizontal bore 35
A
pulley
35 is ?xedly mounted on the rear
I l in which a sleeve I2 is rotatably mounted with
end of the sleeve 12 between the sleeve bearing
both ends projecting from the bore. This sleeve
part of the head l9 and the ?ange 28. In the
is prevented from endwise movements in the head
present instance, the pulley 35 has connection
in any suitable manner, which in the present in
stance includes a radial ?ange I3 thereon pro
jecting into an end recess M in the head bore‘
with and is driven by a motor 35 which also
serves to drive the grinding wheel 31 of the
and engaging the inner wall thereof. The outer
machine.
or free end of the sleeve receives a work-holding
an end ?ange 38, and connecting this and the
Threaded on the rear end of the sleeve 21 is
collet 11 for radial expanding and contracting
?ange 28 with its respective ends shouldered
movements therein and with its outer end bear 45 thereon for relative turning movements is a cylin
ing against a conically restricted end portion l8
der member 39 concentric to the axis of the sleeve
of the sleeve for collet centering and contracting
21 and forming the outer wall of a cylindrical
purposes, as understood in the art.
chamber 40 around said sleeve. This member is
In the rear end portion of the sleeve I2 is
secured against turning relative to the frame
50
mounted a longitudinally slidable chuck sleeve 20
head H) by a pin 4| projecting from an arm
having a separable nose portion 2| with the outer
42 on the member into a hole 43 in said head.
end of its bore provided with an internal conical
The chamber 40 is made ?uid-tight at its rear
or outer end by a ring 44 ?tted in the member
of the collet in opposition to the restriction 18
39 and ?xedly mounted on the sleeve 21 between
to e?ect contraction of the collet when the sleeve 55
taper 22 for coaction with the inner or rear end
3
2,413,678
4
a spring-looking ring 45 thereon and the end
?ange 38, with a gasket 46 between said ring
and ?ange. The inner end of the chamber is
upon the completion of such operation the con
trol 52 is actuated to shut off the ?uid pressure
supply to the chamber 40 and to permit venting
of the pressure therein to the atmosphere. The
spring 48 then acts to return the chuck sleeve
formed by a ring plunger 41 slidingly ?tting both
the inner surface of the member 39 and the outer
surface of the sleeve 21. This plunger has its
and plunger to normally retracted positions to
forward end thrust against the rear shouldered
ends of the ?ngers 25 on the chuck sleeve 28.
permit expansion of the collet to release the
work-piece.
The forward strokes of the sleeve 20 and plunger
I wish it understood that my invention is not
41 are resisted by a coiled expansion spring 48, H)
limited to any speci?c construction, arrangement
the rear end thrust of which is against said
or form of the parts, as it is capable of numerous
shoulders, while its forward end thrust is against
modi?cations and changes without departing
the ?ange 28 on the stationary sleeve 21. In the
from the spirit of the claims.
present instance, the forward end coil of the
Having thus described my invention, what I
spring 48 seats in an annular groove in the, rear
claim as new, and desire to secure ‘by United
face of said ?ange and this groove is of suffi
States Letters Patent, is:
cient depth to extend into the socket 32’, so that
‘1. In a device of the class described, a rotat
the end coil of the spring engages over the outer
ably mounted sleeve, a chuck sleeve mounted
end of the set-screw 32 to prevent an outward
in said ?rst sleeve to turn therewith and have
releasing movement thereof.
longitudinal movements relative thereto, said
A pipe ‘Ell is connected to the chamber iii‘!
sleeves having longitudinally spaced opposing
through an ori?ce 5| in the member 39 and has
collet
engaging portions, a normally expanded
communication through a suitable control 52
coilet interposed between said portions to be en
both with a compressed air supply source to admit
gaged thereby and caused to contract when the
operating air to such chamber and with the at~
chuck sleeve is moved in one direction, a third
sleeve ?tted into the rear end portion of said
chuck sleeve and ?xed to the ?rst sleeve to turn
mosphere to permit an exhaust of air from the
chamber as it may be desired to operate the
chuck sleeve 20 to e?ect contraction or permit
therewith, means cooperating with said third
expansion of the c-ollet H.
sleeve to form a cylinder, a plunger movable in
The collet l1 preferably employed is of the .
said cylinder lengthwise of said sleeves and hav
type shown in perspective in Fig. 7. The work
gripping jaw parts 54 of this collet are 01' seg
mental form and connected together at opposite
ends by spring wires 55 in a manner to retain
the di?erent parts together as a unit and to 35
normally effect relative radial expansion of the
segments to work-piece released position. The
collet is adapted to receive the stem 56 of, for
instance, a valve 5'! to be ground or refaced
and acts by relative contraction of the jaw parts
ing connection with said chuck sleeve to move it
forward under cylinder pressure to effect con
traction of the collet, ‘means acting/on said chuck
sleeve and plunger to normally return them to re
tracted positions, and means controlling the ad
mission of ?uid pressure to and its exhaust from
said cylinder.
'
2. In a device of the class described, a rotat
ably mounted sleeve, a chuck sleeve rotatable
with and mounted for longitudinal movements in
said ?rst sleeve, said sleeves having opposed re
in the art. The outer end surfaces of the jaw
stricted portions and the chuck sleeve having its
parts are tapered to be engaged by the respec
rear end portion provided with longitudinally ex
tive conical surfaces of the sleeves i 2 and 26
to effect contraction thereof, and these surfaces 45 tending slots, a normally expanded collet mounted
within the ?rst sleeve between said restricted por
are preferably provided with bosses or balls to
tions and operable to be contracted by said por
have combined contact with the sleeve surfaces
tions upon forward movements of the chuck
and thereby reduce friction. ‘Nothing ‘new is
sleeve from retracted position, means normally
claimed for this collet.
*
A gauge rod 58 projects centrally into the 50 holding the chuck sleeve in retracted position, a
third sleeve ?tted into the rear end portion of
sleeves 2i} and 21 for stop engagement at its
said chuck sleeve and having portions projected
forward end with the work-piece, and has its
through said chuck sleeve slots and ?xedly con
rear end adjustably held in a bushing 59 in the
nected to‘said ?rst sleeve, means cooperating with
?ange 38 by a set-screw threaded therethrough.
In the operation of the device, a work-piece 55 said third sleeve to form a cylinder into which
the rear end of the chuck sleeve projects, means
stem may be inserted into an expanded collet i‘!
Within the cylinder acting onthe chuck sleeve to
when the sleeve I2 is being driven, the air
normally retain it in rearwardly retracted posi
chamber Iii! at the time being free of air pres
tion, a plunger mounted in said cylinderand in
sure and the chuck sleeve 28, 2| and piston 41
being retracted by the action of the spring 48. 60 forward end thrust engagement with said chuck
sleeve, and means controlling the admission of
A work-piece having been positioned in the
fluid pressure to said cylinder to cause forward
collet, the control 52 is operated to admit ?uid
movement of said plungerand chuck sleeve to
pressure to the chamber lit which effects a quick
e?ect contraction of the collet and also operable
movement of the plunger 47 and chuck sleeve to
the right to cause work-gripping contractionof 65 to. shut. off the ?uid pressure supply to. said cyl
inder and open the cylinder forexhaust of its
the collet. This action is maintained during the
to grip and ?rmly hold the stem, as understood
grinding or refacing operation of the'work and
pressure.
ROBERT S..BEVERLIN..
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