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Патент USA US2117746

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May 17, „'1938.
2,117,746
ROY M. SIEAWRIGHT (ROBERT MORTON FELIX SEAW RIGHT)
CHUCK
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£0
W,
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„HIm
INVENTQR
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E?? Mäeaww'y/ìl
HI 5 ATTORNEY.
2,117,746-1
Patented May 17, 1938
UNITED STATES PATENT OFFlCE
2,117,746
CHUCK '
Roy M. Seawright (Robert Morton Felix Sea
wright), Langlaagte, Johannesburg, South Af
rica, assignor to Ingersoll-Rand Company, J er
sey City, N. J., a corporation of New Jersey
Application June 25, 1936, Serial No. 87,157
6 Claims.
(Cl. 279-58)
This invention relates to gripping devices, and
more particularly to a chuck adapted to be at
tached to the body of a working implement, as
for instance a drill steel.
One object of the invention is to enable the
chuck to be readily attached to and detached
from the working implement, and another ob
ject is to assure a firm gripping action of the
chuck on the working implement.
Further objects will be in part obvious and in
part pointed out hereinafter.
In the drawing accompanying this specification
.and in which similar reference numerals refer
to similar parts,
Figure 1 is an elevation, in section, of a chuck
15
constructed in accordance with the practice of
the invention and showing it connected to a work
ing implement and an actuating device, the lat
ter being partly broken away,
Figure 2` is .a transverse view taken through
0 Figure 1 on the line 2--2,
Figure 3 is an elevation, in section, of the cas
ing of the chuck, and
Figures 4 and 5 are perspective views of de
tails.
25
Referring more particularly to the drawing, 20
designates, in general, a chuck constructed in ac
cordance with the practice of the invention and
2| a working implement to which the chuck 2|]
is .grippingly connected. 22 designates a driving
30 element for imparting a force through the chuck
26 to the working implement 2| for freeing the
latter from the material binding it in the drill
hole 23.
The driving element or motor 22 selected for
35 the purpose of illustration is of the type illus
trated in United States Patent No. 2,012,916,
granted to R. H. Pott, August 27, 1935, and to
which patent access may be had for a full under
standing of the nature of the driving elementl 22.
main momentarily stationary with respect to the
shoulders 26 while the torque of the driving motor
causes contraction of the flexible element and,
therefore, withdrawal of the shoulders 21 from
the shoulders 26. In this way> energy is stored 5
in the flexible element and expended as a tor
sional force against the shoulders 26. Thus, the
driving head 24 is subjected intermittentlyto
torque and to sharp impacts for releasing the
10
working implement 2 I.
The chuck 2U, in the form illustrated, com
prises a casing 29 which is split longitudinally to
divide it into a pair of half sections 3D of which
the confronting surfaces 3l are held in body con
tact with each other by a series of rings 32, 33
and 34 encircling the sections Sil .at rear, inter
mediate and front portions, respectively, to bind
the sections 3l) securely together.
i
The casing 30 is recessed interiorly to provide
a bore 35 which extends entirely through the cas“
ing. The forward portion of the bore 35 is in the
form of an enlarged portion 36 to receive gripping
26:
elements or jaws 31 adapted to grip the working
` implement 2l. The jaws 31 are disposed loosely
in the portion 36 of the bore so that they may N)
move freely longitudinally therein and have inter
nal recesses 38 conforming substantially to» the
contour of the working implement which they are
intended to grip. On the exteriors of the jaws
are coniform surfaces 39 which conform with and
are adapted to frictionally engage a coniform sur
face 4l) constituting the foremost portion of the
bore 35.
‘
The rearmost portion of the enlarged end 36 of
the bore is preferably of cylindrical shape to ac
commodate a plate 4| formed in half sections 42.
The sections 42 have lugs 43, at the points of junc
ture of the sections, which extend into recesses
44 in the surfaces 3| of the casing sections 36
to form an interlocking connection between the
40 It may, however, be explained in connection with
plate 4| and the casing 36 and thereby prevent
relative rotary movement between these elements.
and has shoulders 26 enageable by shoulders 21
The plate 4| seats against the rear or end wall
45 of the portion 36 of the bore and carries on its
front end curved or partly annular ribs 46 of
which the front surfaces are inclined to provide
cam surfaces 41 adapted to engage similar cam
surfaces 48 on the rear ends of arcuate ribs 49
this description that the driving element 22 em
bodies in its organization a driving head, desig
nated herein 24, which is rotatable in a casing 25
45 on a hammer element 28 rotated by a suitable
motor (not shown).
As explained in the patent, the driving connec
tion between the motor and the hammer 28 in
cludes a flexible element (not shown) which
transmits the rotative movement of the motorv to
the hammer 28 and tends constantly to maintain
the shoulders 21 in interlocking engagement with
the shoulders 26, but is capable of endwise con
traction so that, in the event of undue resistance
55 to rotative movement, the shoulders 21 will re
5
carried by the jaws 31.
The portion of the bore 35 lying rearwardly of
the portion 36 and designated 56 is preferably of
only slightly larger diameter than the maximum
cross sectional dimension of the working imple
ment, which extends into the portion 5|).Á Inter
mediate the ends of the portion 50 of the bore is
a stop member 5| which serves to limit the dis 55
2
2,117,746
tance which the working implement may extend
into the chuck. 'I'he portion of the bore 35 lying
rearwardly of the sto-p member and designated 52
is shaped to conform to a stem 53 carried by the
head 24. The stem 53 extends into the bore 52
and, in the present instance, is provided with de
pressions 54 for the accommodation of the ends
of set screws 55 threaded into the ring 32 and the
casing sections 3B to secure the chuck to the
10 stem 53.
'I'he operation of the device is as follows:
Whenever the working implement 2l becomes
rstuck in the drill hole 23, as when a collar of
detritus accumulates around its cutting bit and
bonds it to the wall of the drill hole, the rock
drill actuating the working implement is re
moved from the working implement and the
chuck 20, with the driving element connected
thereto, is placed on the end of the working im
20
plement.
When the driving element 22 is set in operation
its initial rotary movement imparts a similar
movement to the chuck and, since the jaws 3l
are interlockingly engaged with the working im
25 plement, the chuck casing will, therefore, also ro
tate relatively to the jaws. This movement of
the chuck casing causes the cam surfaces 4l to
slide over the cam surfaces d3, assuming, in the
structure illustrated, that the driving element
30 operates to rotate the head 2G in a_ clockwise di
rection as viewed from the operator’s position,
and actuate the jaw members 3l axially forward
toward the open end of the bore.
The thrust thus imparted to the jaws forces
35 vthem into tight gripping engagement with the
working implement. At the same time the coni
form surfaces 39 are pressed into ñrm frictional
engagement with the coniform surface âíi so
that the jaws and the casing will also be locked
40 together. Subsequent operation of the driving
f Adevice subjects the driving head 2li to torque and
impact, in the manner hereinbefore described,
and these forces will loosen the working imple
ment from the material binding it in the drill
45 hole.
Inasmuch as the driving element and the work
ing implement are connected firmly together a
constant pull may be applied to the driving ele
ment by the operator during the operation of
50 the driving element.
This force, together with
the forces delivered by the driving element, in
variably suñice to quicldy loosen the working im
plement. After the working implement has been
freed the chuck may be rotated in anti-clockwise
55 direction and the cam surfaces 4l thereby moved
out of engagement with the cam surfaces G8. In
this way the jaws 3'! will be released from the
working implement and the coniform surface 40
and the working implement may then be con
60 veniently removed from the chuck.
I claim:
1. A chuck, comprising a casing having a bore
to receive an instrument, gripping means freely
movable longitudinally in the bore, surfaces on
65 the gripping means and in the bore adapted to
-frictionally engage each other, and means on the
casing extending longitudinally into the bore sep
arate from the gripping means and the casing
acting to push and move the gripping means to
70 engage the instrument and said surfaces into
frictional engagement upon relative rotary move
ment between the casing and gripping means.
2. A chuck, comprising a casing having a bore,
an inclined surface in the end of the bore, a
gripping device in the bore and having an in
clined surface to engage the ñrst said surface,
and means on the casing extending longitudinally
into the bore separate from the gripping device
and the casing to push and impart gripping
movement to the gripping means and effect ñrm
frictional engagement between the inclined sur
faces upon relative rotary movement between the
chuck and gripping device.
3. A chuck, comprising a casing having a bore,
jaws in the bore, inclined surfaces on the ends 15
of the jaws and in the bore cooperating with each
other to effect gripping movement of the jaws
upon axial movement of the jaws within the
bore, and ribs on the inner ends of the jaws
and the adjacent portions of the casing having 20
inclined surfaces to cooperate with each other to
effect such movement of the jaws and to effect
ñrm frictional engagement between the first said
inclined surfaces upon relative rotary movement
between the jaws and the casing.
4. A chuck, comprising a casing having a bore,
a coniform surface in the bore, jaws in the bore
having coniform surfaces to frictionally engage
the coniform surface in the bore, cam surfaces
on the ends of the jaws, and plates in the end of
the bore interlocked with the casing and having
cam surfaces to engage the ñrst said cam surfaces
upon relative rotary movement between the jaws
and the said plates for pressing the jaws into
frictional engagement with the coniform surface
of the bore and to impart gripping movement to
the jaws.
5. A chuck, comprising a casing formed in a
plurality of sections and having a bore extending
therethrough, means to secure said sections to
gether, a coniform surface in the bore, jaws in
the bore having coniform surfaces to frictionally
engage the coniform surface in the bore, cam sur
faces on the jaws, cam members in the bore to
engage the cam surfaces for pressing the jaws
into frictional engagement with the coniform sur 45
face of the bore and to impart gripping move
ment to the jaws upon relative rotary movement
between the casing and the jaws, and means on
the cam members interlockingly engaging the
casing to preventV rotary movement of the cam
members with respect to the casing.
6. A chuck, comprising a casing formed in a
plurality of sections and having a bore extending
therethrough, rings encircling the sections for
binding said sections together, a coniform surface
in the bore, jaws in the bore having coniform sur
faces to frictionally engage the coniform surface
in the bore, cam surfaces on the innermost ends
of the jaws, plates in the bore having cam mem
bers to engage the cam surfaces upon relative
rotary movement between the casing and the jaws
for actuating the jaws axially of the bore and
thereby impart gripping movement to the jaws
and cause the coniform surfaces of the jaws and
the bore to frictionally engage the casing, and
means for securing the casing to a chuck driver.
ROY M. SEAWRIGHT.
'
(ROBERT MORTON FELIX SEAWRIGHT) .
70
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