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Патент USA US2403768

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July ‘9, 1946.
'
‘A. MpsTONExR
'
' 2,403,768’
DOUBLE 'Ac'rmev COLLET CHUCK‘
4 Filed Aug. 31, 1944
22
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$796.22‘, 64 733513” 6*‘ ‘
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INVEN TOR;
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14717051175)’
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July9, 1946-
‘
Y
A. MCSTONER
'
2,403,763 ‘
DOUBLE ACTING CQLLET CHUCK
Filed Aug. 31, 1944 -
.72
5 Sheets-Sheen 3
Patented July 9, 1946
* 2,403,768
" ' 'LDOUBLE-AC'TI‘NG coLLE'r crr'UoK
I ‘Arthur Merrickstoner, WestHartf'ord, Conn., as- '
‘
signor toThe Jacobs Manufacturing Company, '
\ v
: y-Hartfo'rilconnua corporation of Connecticut H ,
I’ vApplication August31, 1944,1‘Serial'vNoa 552,065
8 Claims. (crave-51)
1
tion showing ‘a transverse pin and bushing sepa
This invention relates to a. Double actingcollet ,
chuckjf Its object is toprovide a simple and in
expensive construction in which-a; collet having a
rated from each other.
‘tapered portion .is , engaged between‘ two.v parts
of a. chuck which are relatively movable longi
in sectional sideelevation in Fig, ;12.~
'with-a cone-shaped cam surface which engages
shown in Fig.
> r
12.
~
.
Y
>
"
~
.
Fig. 14 is'a sectional side elevation of a chuck
'the' tapered portioniof the collet and the other
of which has a transverse abutment surface which
eccentric transverse pin and a collar in threaded
~
Fig. 13 is. a sectional plan view of the ‘chuck
tudinally, one ‘of. which members is constructed
engages an end of the collet. It relates ‘more
particularly to that type of chuck which has, a
hollow body provided with means for attachment
to'a-machine tool with a longitudinally slidable
member or thrust :block within it actuated by an
This pin is~a ‘part of
the structures shown’ in the preceding ?gures. >
I Another-structural- modi?cation is illustrated
of still further modi?cation.
'
’
~
Fig. 15 is an elevation of the transverse pin used
170
as a part of the chucks shown‘in Figs. 12-14;‘; " '
.- Referring ?rst to Figs. 1, 2jand 3,20 designates
' the body of the chuck, This is-ahollow- cylin
drical 'V'member provided-with threads 2| ‘ate-its
v15
rear end bymeans of which it can be'attached to
a machine tool, and a -bore~22,;the forward part
engagement with the body whereby. the collar
'is ?rst rotated to move it towardthe block to
of 30
which
is a isthrust
internally
blockthreaded
slidablyrmounted
as at 23; in-the
_
compress the collet into‘ initial contact with an
bore 22., It has a transverse abutment surface
‘article within it, after which the block is moved
toward the collar to e?'ect'a‘ ?nal grip on the 20 3| at its forward end back of whichjis av trans
verse. slot 32 which has ?at parallel sides and
This application is a continuation in part of
is dsomewhat longer than the distance between its
article.
'
i
g‘
->
~
~
‘
application'Serial No. 527,384, filed by me March
5]
es;
.
-
.
.
‘
"Ml-{is a collar, externally threaded at‘ 4|,- to ?t
I have illustrated several constructions for ef- I so -a," the threads 23 on the forwardpart of the body.
21,
1944.
1
'
'
'
>
It has “an internalcone-shaped cam surface 42
. ~fecting the foregoing results which I will describe
and its‘cuter-end. 43 may be formed with ?attened
in the following speci?cation and will point .out
the novelfeatures of the invention in, the ap
pended claims.
a
.
~ Referring to the drawings:
a
sides to'facilitate its rotation.’
.
v
enlarged circular head 5| which is 'rotatively
seated in~a circular pocket 24 in one side of the
,which is made according to and embodies this
I
_
»
.body. The. opposite vendportion 52 of the pin is
V
of restricted diameter and ?ts a circular bushing
‘53, the outer diameter ‘of which is shown to be
Fig. 2 is a front view. of the chuck shown in
Fig.
1;
.
‘
~ .
the body Zlland'the block 30. This pin has an
30
Figure 1 is a sectional side elevation of a chuck
invention;
'
. . 50.15 a’ pinwhich'passes transversely through ‘
‘
,
Fig. 3 is a sectional side elevation of the chuck
the same as that of the head 5| and isarranged
shown in Fig. 1, the view being taken at right
tobe rotatively’seated in‘a circular pocket 25 in
, angles to that shown in the latter ?gure;
'
' Fig. 4 is a sectional side elevation on a larger
the other side of the body. ‘ ,The head 5l,»bushing
53 and the openings Hand 25 are all in axial
,
alinement. The intermediate part 54 of the pin
'-'scale of the collet shown in the preceding and
other ?gures; the section is taken on the line '4—4
betweenthe head 5! and the bushing- 53 is circu
of Fig. 2;
lar in cross sectionrwith its axis offsetffrom the
axis of. the head and the bushing. Its diameter
is less than that‘of the head and the-bushing
and greater than that of the reduced portion 52.
,
I
Fig. 5 is a sectional side elevation of a chuck
of modi?ed‘ construction which also embodies this
:invention;
.
‘
‘
V
This intermediate part 54 of the pin passes
through the slot 32 in the block, the sides of which
Fig. 6 is a similar sectionof a chuck similar
tothat shown in Fig. 5, butlof modi?ed formf
arespacedf apart a distance toprovide a sliding
Fig. 7, is va sectional side elevation showing an
, other structural modification;
-
.
"?t with this part‘ of the pin. A polygonally sided
‘
Fig. 8 vshows a further modi?cation;
'hole 55 is ,provided'incnezend of the'jpin for
60
the reception of a wrench by which the pin may
. ‘In Figs. 9 and 10, I have shown in‘ sectional
.sideelevation and sectional transverse elevation
respectively, another form of chuck which em
.bodies my invention; >
Fig. 11 is an elevation" of a detail ofconstruc
‘be rotated.
‘
.
' .
I
'
7
These parts are assembled-‘by passing the pin
55 I
32 in the. blockjand into the pocket 25in the-body.
through one side ‘of thellbordy, through the slot
2,403,768
3
4
The bushing 53 is then placed on the restricted
end 52 of the pin into its seat 25 in the body after
which the end of the restricted part 52 is riveted
over the adjacent part of the bushing.
A collet 60 is interposed between the block 30
and the collar“. This comprises a plurality of
wedge shapedgrippingumembers 6| of rigid ma
this case and in Fig. 14 the body 20A has a solid
threaded shank 21B projecting from its rear end.
A solid transverse pin 10 like that shown in Fig.
15 is used with these constructions. This form
has concentric circular heads ‘H, ‘H and an in
termediate eccentric portion 12. The latter is of
reduced diameter so that shoulders are formed
terial angularly and radially disposed about a
between‘it and the heads ‘Hf A transverse bore
common axis." These are interconnected ‘by 'a
body 62 of resilient material which may pass
through perforations in the gripping members, as
25 of a diameter corresponding‘ to‘ that of the
_ heads ‘H is made through the body 20A and the
at 63.
Such a collet is more particularly de
pin '10 is inserted therein. Then the thrust block
303 andthe cross-head 33A are inserted in the
body from its frontend before the collet 60 is
inserted‘and the collar =40 is applied. The width
issued April 18, 1944, and in a copending applica
tion for patent Serial No. 521,907, ?led by me 15, of the cross‘eheadfis' substantially the same as the
scribed in my Patents Nos. 2,346,706 and 2,346,707 , I
Feb. 4, 1944. Its gripping members form a trans
verse end 64 and their outer edges 65 are adapted
to be engaged by the cam surface 42 of the collar.
In Fig. 5 the transverse slot or pocket 32A in
the thrust block 30A is wider than that shown in 2O
the previously described ?gures and a cross-head
33 having a bore which ?ts the part 54 of the
transverse pin is slidably ?tted in the slot 32A.
In this ?gure the forward part of the body is
externally thread-ed and the collar 40A provided -
distance between the shoulders formed on the
pin. It ?ts'between'v the shoulders and restrains
the pin from longitudinal movement. If desired,
portions ‘of the body may be peened, as at 21, to
further restrain the pin.
The-modi?cation illustrated in Fig. 14 is similar
to that shown in Fig-s.v 12 and 13, but in this case
the cross-head 33D is thinner and ?ts slidingly
in'a transverse groove 32D formed in the thrust
block 30F.
"
--1
‘
'
In all of the structures shown, initial compres
sion of the collet is effected by screwing the nut
The collar ‘40A has an inwardly extending
or‘ collar into or onto'the body. This will‘ hold
‘?ange '44 with a ?at inner face which bears on a
an article within the collet in'desired centralized
shoulder formed on a pressure member 45 which
has an outer cylindrical surface ?tting the bore 30 position.~ Further and ?nal grip on the article is
obtained by rotating the transverse ‘pin to force
22 and an inner conical cam surface adapted to
engage the tapered edges 65 of the gripping mem
the thrust block and the collet toward the nut or
collar. In the constructions shown in Figs. l—3,
bers of the‘ collet. A description of a way' of in
5, 7-10 the thrust block is retracted by turning
terconnecting the collar and. the pressure member
the pin in the opposite direction. In the other
shown in Fig. 5 may be found in my copending :
forms the resilience of the material 62 will release
application for patent Serial No. 510,447, ?led
with internal threads to ?t it.
Nov. 16, 1943.
_
the gripping members when the longitudinal
-
Fig. 6 ‘is similar to Fig. 5, but in this case the
rear end of the thrust block 30D is open at as 34.
In Fig. 7 the pressure member 45'?ts a cylin
drical bore 35 formed in an extension of the
thrust block 396.
'
'
In Fig. 8 the cone-shaped cam surface 42A'is
pressure is removed from them.
'
' Various modi?cations vin construction, mode of
‘operation, method and‘ use of an invention may
and do occur to others, especially after bene?t
ting from knowledge of such a disclosure as that
herein presented of the principles involved, but
the invention itself is not con?ned to the present
and the ?at inner surface of the collar ?ange 45 showing.
I claim:
44A bears against the end 64 of the collet, the
’ 1. A chuck comprising a hollow body, means
position of which in this ?gure is the reverse of
for attaching the body to a machine tool, a thrust
that shown in the other ?gures.
V
block longitudinally slidable in the body having
I A modi?cation of the cross-head 33A is shown
in this ?gure in which it bears against one side 50 a transverse slot therein and a transverse abut
only of the transverse groove or pocketr32B. 7A
ment surface formed on its forward end, a collet
comprising a plurality of angularly spaced wedge
groove is formed across the other side of the
cross-head and the intermediate part 54 of the
,shaped gripping membersof rigid material with
transverse .pin ?ts between this groove and the
their wider ends in slidable engagement with said
opposite ?at side‘ of the groove 32B.
abutment surface and a body of resilient material
In Figs. 9 and 10 a longitudinal central bore 36
interconnecting said gripping members and hold
ing said members in substantially radial posi
passes through the block 30E. The transverse
tions, a member in adjustable threaded engage
slot 320 is cut across one side of the block. 33B
is a cross-head in the slot 32E in the block 30E
ment with the forward part of the body, a cone
?tting its sides and slidable radially therein. 60 shaped cam actuated by saidthreaded member
arranged to engage the outer edges of the grip
The cross-head is cut away as at 3'! (Fig. 10) to
clear the bore 36. It has a transverse bore in
ping members to move their inner ends across
which ?ts the intermediate part 54 of the trans
the abutment surface of the thrust block, and a
verse pin.
'
'
pin passing through the thrust block having an
enlarged end portion seated in a circular opening
In this construction the chuck is open from end
to end. The threads 2| A are shown on the out
in the body‘and rotatable therein, said end por
side of the rear end of the body 20 and the nut
tion of the pin being eccentric to the part thereof
40B has an outwardly extending ?ange MB.
which is in the thrust block.
‘ _
'
The pin 50 which has been described and which
2. A chuck comprising a hollow body, means
formed in an extension of the thrust block 30D
is illustrated in detail in Fig. 11 is used in all of "
the constructions which have been described.
In the construction shown in Figs. 12 and 13,
the thrust block 303 is like that shown in Fig.
6, open at its'rear end, as at 34, and the cross
' head 33A ‘is similar to that shown in Fig. 8.
In
for attaching the body to a machine tool, a thrust
block longitudinally slidable in the‘ body having
a transverse slot therein and a transverse abut
ment surface formed on its forward end, a collet
comprising a ‘plurality of angula-rly spaced wedge
‘shaped gripping members of rigidmaterial with
2,403,768
5
'
their wider ends in slidable engagement with said
abutment surface and'a body of resilient material
interconnecting said gripping members and hold- '
said threaded member having a cone-shaped cam
arranged to engage the outer edges of the grip
ping members, and a pin passing transversely
ing said'members in substantially radial posi
tions, a member in adjustable threaded engage
through the body and the cross-head, having
ment with the forward part of the body, a cone
shaped cam, in said threaded member arranged
to engage the outer edges of the gripping mem
bers to move their inner ends across the abutment
, enlarged circularheads seated in pockets in the
body and rotatable therein, ‘and an intermediate _
eccentric cylindrical portion of reduced diameter '
surface'of the thrust block, and a pin passing 10
through the body having enlarged end portions
seated in circular openings inv the body and ro
tatable therein, and an intermediate eccentric
portion passing through the slot in the thrust
block.
_
6
arranged to be engaged by said abutment surface,
in the bore through the cross-head.
6. A chuck comprising a hollow'body, means
for attaching the body to a machine tool, athrust
block longitudinally slidablein the body, said
block having a transverse slot havingp'arallel
?at sides and a transverse abutment surface
formed in its forward end, a cross-headrin said
slot, a threaded member in engagement with the
forward part of the body,‘ a collet interposed .be
‘tween the block and the threaded member, said
collet comprising a plurality of wedge-shaped
20 gripping members with their endsarranged to
_
3. A chuck comprising a, hollow body, means
for attaching the body to a machine tool, a thrust
block longitudinally slidable in the body, said
block having a transverse slot with parallel ?at
sides and'having a transverse abutment surface
formed on its forward end, a cross-head in said
' .be engaged by said abutment surface,
slot, a transverse borev through the cross—head,_
a member , in adjustable threaded engagement
said
threaded member having a cone-shaped cam
arranged to engage the outer edges of the grip
with the forward part of the body, said threaded
ping members, and a pin passing transversely
member having a cone-shaped cam, a collet inter 25 through the body backof the cross'-head,_having
posed between the block and the threaded mem
end portions seated in circular openings in the
ber, said collet comprising a plurality of wedg'ee , body and rotatable ‘therein, and an intermediate
shaped gripping’ members with their wider ends‘
eccentric cylindrical portionengaging the cross
seated on 'said abutment surfaces arranged to
head and one side'of the slot.
' ‘
"
engage the outer edges of the gripping members, 30 I 7.,A chuck comprising a hollow body, means ,
and a pin passing transversely through the body
for ‘attaching the body toa machine tool, a hol
and the block'having end portions seated in cir
low thrust block longitudinally slidable in the
cular openings in the body and rotatable therein
body, said block having transverse abutment sur
and an intermediate eccentric portion ?tting the
faces formed at‘ its ‘forward end, a cross-head
transverse bore therethrough.
V
engaging one of the abutment surfaces, a thread
4. A chuck comprising a hollow body, means
ed member in engagement with the forward part
for attaching the body to a machine tool, a thrust
of the body, a ‘collet interposed between the block
block longitudinally slidable in the body, said
and the threaded member, said collet compris
block having a longitudinal bore passing there
ing a plurality of wedge-shaped gripping mem
through, a transverse slot extending laterally 40 bers with their ends arranged to be engaged
from one side‘ of the bore with parallel ?at sides
normal, to the axis of the bore, and having a
transverse abutment surface formed on its for
’ by the other abutment surface, said threaded
member having a cone-shaped cam arranged to
engage the outer edges of the gripping members,
. Ward end, a cross-head in said slot, a transverse
and a pin passing transversely through the body
bore through the cross-head, a member in ad 45 back of the cross-head having enlarged circular
justable threaded engagement with the forward
part of the body, said threaded member having
heads‘sea‘ted in pockets in the body and rotat
, able therein, and anintermediate eccentric cy
a cone-shaped cam, a collet interposed between
'lindrical portion of reduced diameter engaging‘
the block and the threaded member, said collet" ' the cross-head, the headset‘ the transverse pin
comprising a plurality .of wedge~shaped gripping _,
overlapping the cross-head.
members with their wider ends seated on said
8. A chuck comprising a hollow body, means
abutment surface, arranged to engagev the outer
edges of the gripping members, and a pin passing ,
for attaching the body to a machine tool, a
hollow thrust block longitudinally slidable in the
transversely throughrthe body and the cross-head
body,
said block having transverse‘ abutment
55
o?’set from the axis of the body and the block to
clear the longitudinal bore in the block,'said pinv
having end portions seated in circular openings
in the body and rotatable therein, and an inter
mediate eccentric portion ?tting the transverse
bore through the cross-head.
'
5. A chuck comprising a hollow body, means
surfaces formed at its forward end, a cross-head
engaging one of the abutment surfaces, a trans
verse groove across the cross-head, a threaded
member in engagement with the forward part of
the body, a collet interposed between the block
60 and-the threaded member, said collet compris
ing a plurality of wedge-shaped gripping mem
for attaching the body to a machine tool, a thrust
bers and an interconnecting body of resilient ma
block longitudinally slidable in the body, said
terial with the ends of the gripping, members
block having a longitudinal bore passing there
arranged to be engaged by the other abutment
65,
through, a transverse slot extending ‘laterally
surface,,.said threaded member having a cone
from one side of the bore with parallel flat sides,
shaped cam arranged to engage the outer edges
normal to the axis of the bore,'and a transverse
of the gripping members, a transverse bore
abutment surface formed in its forward end, a
through the body back ‘of the cross-head, and
cross-head in said slot, a‘transverse bore through
a pin in said bore having enlarged circular heads
the cross-head, a threaded member in engage
rotatable therein, and an intermediate eccentric
ment with the forward part of the body, a collet
cylindrical portion of reduced diameter engag- '
interposed between the block and the threaded
ing the cross-head, the heads of the transverse
member, said collet comprising a plurality of
pin‘ overlapping the cross-head.
wedge-shaped gripping members with their ends
"
ARTHUR MERRICK STONER.
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