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Feb. 1, 1949.
-
-
M. M. FULLER
I
INTERNAL COLLET
Filed July 20, 1946
2,460,414
‘2,460,414
Patented Feb. 1, 1949
UNITED STATES‘ PATENT oFFlcE Morell M. Fuller, San J acinto, Calif.
Application July 20, 1946, Serial No. 685,104
5 Claims.
(Cl. 279—-2)
.
2
1
This invention relates to an internal collet, or
work-holder, for use in connection with lathes,
milling machines, etc., and refers particularly to
a‘ device which is intended to grip a workpiece
from an interior bore thereon.
_
It is the general object of the present‘ inven
tion to provide an. improved form of internal col
7 let or work-holder.
More particularly, it is an object of the present
to form a nearly continuous cylindrical surface.
Between the sides 3 and 4 there is provided a
?ange 5 having a groove in which is positioned a
spring ring 6. The spring ring 8 serves only to
prevent the three di?erent jaw members from
becoming separated, when the} device is not in
use.
Interiorly of the jaw members, at about the
point of alignment with the ?ange 5, the jaw
invention to provide a work-holder for use on 1O members
lathes, etc., which work-holder is so constructed
and arranged that it is adapted to hold a work“
piecerfrom the inner bore thereof to permit fur
ther machine work‘ on the workpiece, which de
vice is characterized by the fact that it holds the
workpiece very accurately from its inner bore so
that ‘it is possible, if desired, to remove and re
chuck the workpiece.
'- ‘
» _
Another object of the present invention is to
provide an internal collet or work-holder which
is adapted to automatically adjust itself’ to grip
collectively provide a substantially
spherical socket in which is mounted a ball ‘I.
The ball 1' serves to act as a universal pivot or
fulcrum for the jaw members in the manner here
inafter described. At the operating side 1i the
members collectively provide an internal groove
in which is mounted a ring 8 of resilient mate
rial, such as rubber, of suf?cient size and resili
ency to cause the pivoting of the jaw members
around the ball ‘I so that they contact together
in the positions indicated in Figs. 2 and 3. The
operating side 4 of the jaw members provides a
somewhat smooth, substantially cylindrical, sur
face 9 for the purpose hereinafter described,
and there is preferably supplied a slightly en
Another object of the present invention is to
provide an internal collet which may be used "' larged end Hi.
the inside of’ a workpiece even when the inte
rior bore'of the workpiece is not entirely round.
In using the device of the present invention.
in production operations on a clutch chuck, which
the right-hand side, or side 3, is inserted into
internal collet isiadaptedifor operation with a
the bore of the workpiece which is to be held.
lathe running at full speed so that the work
The operating side 4,‘ or left-hand side, as seen
can 'be removed and replaced without interrupt
in
the drawing, is gripped by the holding ele
30
ing the operation of the lathe.
ment attached to the lathe or milling machine in
A furtherobject of the present invention is
which the device is to be used. As pressure is
to simplify and reduce the cost of constructing
applied to the side 4, squeezing it together against
an internal collet Without interfering with the
the resilient rubber ring 8 by the member which
e?iciency and accuracy of the device in use.
Various other objects and advantages of the 35 holds the collet to the lathe or milling machine,
then the side 3 of the device undergoes separa
collet of the present invention will be apparent
tion or expansion, applying pressure to the in
from the following description of a preferred
terior surfaces of the workpiece to be gripped
example of the invention. The description is
by the device. In fact, any desired means may
given in connection with the accompanying draw
40 be applied for holding the collet of the present
ings, in which
invention to the lathe or milling machine.
Figure 1 is a side view showing the device in
In Figs. 1 and 4, I have indicated the device
use in an ordinary chuck.
. positioned in an ordinary chuck, indicated at the
Figure 2 is an end view.
dotted lines H, in Fig. 1. For ?tting the device
Figure 3 is a section on the line 3-3 of Fig. 2,
45 into an ordinary chuck it may be desirable to
separated from the chuck and adapter.
use an adapter such as indicated at I2 in Fig. 4.
Figure 4 is a side view in vertical section of the
In Fig, 4 the adapter is a self-locking member
adapter.
having a ?ange l3 at its right end for limiting
Referring to the drawings, the device of the
the movement of the adapter into the bore of
present invention includes three complementary
jaw members 2 which may be assembled together 50 the chuck H, and reduced as indicated at M to
provide a shoulder i5. When the adapter is used
to form a substantially cylindrically shaped body,
with the collet of the present invention it will
the individual jaws making angles of 120° with
be seen that the shoulder it engages the shoul
each other. Each jaw member includes a work»
der of the enlargement [0. From the left end
supporting side 3 and an operating side 4. The
of the device are provided a plurality of slots
outer surfaces of the jaws on the side 3 unite
2,460,414
3
l6 and from the right end of the device are pro
vided a plurality of slots ll so that the device
is capable of contracting under pressure.
While the particular form of the collet herein
described is well adapted for carrying out the
objects of the present invention, it will be under~
4
bers cooperating to form an internal spherical
surface at its medial portion, and a ball engag
ing said surface for mounting the same as a
fulcrum to permit one side of the jaw members
stood that Various modi?cations and changes
may be made, and this invention is not limited
to expand while the other side contracts.
4. Aninternal collet for holding a. workpiece
by the internal bore thereof, which collet com
prises jaw members uniting to form a hollow cy
to the particular form shown, but includes all f
lindrical body, the body being divided longitudi
such modi?cations and changes as come Within 10 nally'to form three jaw members, the jaw mem
the scope of the appended claims.
'
bers cooperating to form an internal'spherical
I claim:
surface at its medial portion, a ball engaging the
1. An internal collet for removably sustaining
said surface for mounting the same as a fulcrum
a workpiece from the inner bore thereof, which
to permit one side of the jaw members to ex
collet comprises jaw members uniting to form a 15' pand While the other side contracts, and Ya resil
substantially cylindrical body separated longi
ient ring yieldingly urging one side of the jaw
tudinally into three separate jaw members, and
a spherical fulcrum member positioned interiorly
of the jaw members, the jaw members extending
members into expanded position.
side thereof they may expand andecontract with
in. the bore of the workpiece to be supported by
lindrical body, the body being divided longitudi
nally to form thre'ejaw members, the jaw mem
thecollet and at the other side of the fulcrum
they provide surfaces adapted to be contracted
by a device for mounting the collet, said jaw
members having segmental spherical surfaces en
gaging the fulcrum member.
2. An internal collet for removably sustaining
a workpiece from the inner bore thereof, which
collet comprises jaw members uniting to form a 30
bers cooperating to form a spherical outer sur
face ‘at’ each end, a ball engaging the jaw mem
bers for mounting the same on a fulcrum to per
mit one side of thejaw members to expand and
pands, the jaw members having segmental spheri
cal surfaces engaging said ballya resilientoring
yieldingly urging one side of the jaw members
tudinally into three separate jaw members, a
into expanded position, and a retaining means
for retaining the jaw members in assembled ,po
5. An‘ internal collet for holding a workpiece
to the internal bore thereof, which collet com
both sides of the fulcrum member so that at one 20 prises jaw members uniting to form a hollow cy
substantially cylindrical ‘body separated longi
spherical fulcrum member positioned interiorly
contract while the other side contracts and ex
sition.
_,
of the jaw mel ibers, the jaw members extending
toboth sides-of the fulcrum member so that at
one ,sidethereof they expand and contact the
bore of’ the workpiece to be supported by the
collet and at the other side of the fulcrum they
provide surfaces adapted to be contracted by a
device for mounting the collet,rsaid jaw mem
bers having segmental spherical surfaces engage
ing the fulcrum member, and a resilient ring
engaging the inner surface of the jaw members
,for yieldingly urging the jaw members into the
releasing position.
3. An internal collet for holding a workpiece
by the internal bore thereof, which collet com
prises jaw’ members uniting to form a hollow cy
,7
_
MORELL M. FULLER.
REFERENCES CITED
The following references are of record inthe
?le of this patent:
V
V
UNITED STATES PATENTS
Number
V
Name
Date
243,978
Rominger _'_'_ ______ __ July 5, 1881
604,250
‘ Jacelyn ____~____'____ May 17, 1898
1,164,704
. Courembis ____ _>____ Dec. 21', 1915
1,243,860
Olson et- a1. ___
2,416,220
Reynolds _____‘_'_;_-__ Feb. 18, 1947
lindrical body, the body being divided longitudi
Number
nally-to formrthree jaw members, the jaw mem 50
398,951
V____ Oct. 23,191’?
FOREIGN’ PATENTS
Country
Date
Germany ________ _'_ ______ __ 1924
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