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Патент USA US2129848

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Sepî. i3, X938.
K. A, KUHN v
29Í29ß48
INTERCHANGEABLE DIE COLLET
Filed July 25, 193'/
Z6'
`
INVENTOR
M'
ATTORNEYS
Patented Sept. 13, 1938
2,129,848 '
UNi'i‘ED STATES ' PATENT oFF-ics
2,129,848
INTERCHANGEABLE DIE COLLET
Karl A. Kuhn, Greenfield, Mass., assigner to
Greenfield Tap and Die Corporation, a corpo
ration of Massachusetts
Application July 23, 1937, Serial No. 155,162
5 Claims.
This invention relates to dies and is especially
in accurate alignment with each other and the
directed to a die collet adapted to hold in accu
axis of the work.
rately clamped position dies of various sizes.
Die jaws I6 lmay be made in various thick
nesses;y and an arrangement is provided whereby
The general purpose of the invention is to pro
5- vvide a collet adapted for the interchangeable
mounting of dies of the sectional type in a wide
range of sizes, and particularly to provide means
-for clamping in the collet dies varying in thick
ness.
Other objects and advantages will appear from
the following specification taken in connection
with the accompanying drawing, in which
Figure 1 is a top plan View of an assembled
collet;
15
(Cl. 10-116)
Figure 2 is a transverse section on line 2-2 of
Figure l;
Figure 3 is a transverse section on line 3--3 of
Figure l;
Figure 4 is a sectional View similar to Figure 3
20 illustrating another type of interchangeable
clamp-ing elements;
Figure 5 is an expanded view of the construc
tion shown in Figure 4.-;
Figure 6 is a section similar to Figure 3 of an
other arrangement to the interchangeable
clamping structure; and
Figure 7 is an expanded View of the clamping
members of Figure 6.
The collet is preferably of the cylindrical type
30 adapted to ñt into standard sockets in die stocks
and the like. The body II is provided with a
cylindrical concentric recess I2 forming a cylin
drical side wall I3 and a bottom I4 having a
central opening i5 of appropriate size and con
tour for the passage of the work and the dis
charge of chips.
The collet is particularly adapted to hold in
clamped position a die of the sectional type in
cluding opposed jaws symmetrically located with
"i0 respect to the die axis and capable of longitudi
nal adjustment. An appropriate embodiment is
illustrated, comprising two die jaws I6 having
beveled side faces I'l, adapted to rest on the bot
torn I4 and to be adjusted longitudinally as by
screws I8 in the body I I.
The die jaws I6 are clamped in body Il by
clamping segments I9 ñtting accurately against
wall i3 of the recess I2 at opposite sides and
provided with beveled inner faces 20 at the same
angle as the eiîective side faces Il of die section
i6. The segments I9 are held in clamping posi
tion by screws 2i extending through the bottom
oi the body Il. Segments I9 are accurately pro
55 portioned and shaped to clamp the die jaws I6
such jaws `may be interchangeably clamped in
the same body II. One construction for this
purpose is shown ‘in Figures 4 and 5, and com
prises an interchangeable bottom plate 22 fitting
accurately on the bottom I4 and provided with a
central recess 23 registering with recess I5. 10
Clamping segments 24 are similar in shape and
arrangement to segments I9 except for decreased
thickness corresponding to the reduced thickness
of die jaws 25 in comparison with jaws I6.
Clamping screws 26 extend through the bottom 15
of body II and bottom plate 23 into threaded
engagement with clamping segments 24, ar
ranged so that when the die jaws 25 are in posi
tion and screws 26 are tightened, said jaws will
be held ñrmly in accurately aligned position be 20
tween segments 24 and against the bottom plate
22.
With this construction it will be apparent that
for each thickness of die jaws 25 a corresponding
bottom plate 22 and segments 24 may be pro 25
vided, permitting the use of the body l I and the
standard die stocks or the like for a substantial
range of die thicknesses, while maintaining flush
surfaces at the top and bottom of the collet after
the die jaws and clamping structure have been 30
assembled therein.
Another arrangement for the same purpose is
illustrated in Figure 6. It is similar in construc
tion to the form shown in Figure 4, except that
one of the clamping segments 24 is fixed to the 35
bottom plate 22, and preferably is integral there
with, forming a composite clamping member 21
and reducing the number of parts.
'I'he parts are constructed and arranged to
facilitate great accuracy in construction and 40
alignment, and to provide ñrm positive clamping
of die jaws of various sizes. 'I'hey are'designed
for ready manufacture on standard machines.
The preferred embodiments illustrated herewith
have been shown to scale, though various modifi 45
cations are possible within the scope of the in
vention as set forth in the claims.
I claim:
1. A die collet comprising a body having a die
receiving recess and an interchangeable die-hold 50
ing unit in the recess, said unit comprising a re
movable die seat in the bottom of the recess, a
die clamp member on the seat at one side of
the recess, a separable cooperating die clamp
member above the seat at the opposite side of
2
2,129,848
the recess, and means for holding said members
and seat in die-holding position in the recess.
2. A die collet comprising a body having a die
receiving recess, and an interchangeable die
through said body from the lower surface there
of.
4. An interchangeable die-clamping unit com
prising a body of circular disk shape having a
holding unit in the recess, the unit comprising a
removable die seat on the bottom of the recess,
cylindrical side Wall or flange and a. die seat
a die clamp member on the seat at one side of
a die clamping member integral with the seat
Within said side wall and arranged at one side
the recess, having a beveled face positioned to en
gage one side of a die element, a separable co
10 operating die clamp member above the seat at
the opposite side of the recess and having aI
adapted to engage the bottom of a die element,
thereof in position to engage a side oi a die ele
ment, a separable die clamp member at the other 10
side of the die seat Within said side wall in posi
beveled face positioned to engage the other side » >tion to engage the other side of a die element,
of a die element, and means including an element and means for holding the separable member in
engaging the separable member for clamping said
15 unit in operative die-holding position.
y
3. An interchangeable die-clamping unit com
prising a body of circular disk shape having a
cylindrical side Wall or flange and a seat for the
bottom of a die element, a die clampingymem
20 ber mounted on one side of the seat within said
side Wall and arranged to engage one side of a
die element, a separable member at the other
side of the seat within said side wall arranged to
engage the opposite side of a die element, and
25 means for holding the separable member in die
clamping relation to the other member and seat
comprising retaining means extending upward
die-clamping relation to the other member and
seat comprising retaining means extending up 15
ward through said body from the lower surface
thereof.
5. A die collet comprising a body having a die
receiving recess, and an interchangeable die
holding unit mounted in the recess, said unit 20
comprising a seat in the bottom of the recess, a
die clamp member mounted on the seat at one
side, and a cooperating die clamp member re
movably mounted above the seat at the other side
by screw means engaging the body.
25
KARL A. KUHN.
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