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Патент USA US2109979

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Mwr'ch 1,, mm”
W. A. 8MKTH, SR
mmmg
ROTATION MECHANISM
Filed March 14, 1936
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H i 5 ATTORNEY.
Patented Mar. 1, 1938
2,109,979
STATES
‘ATENT ()FFI'QEv
2,109,979
ROTATION MECHANISM
William A. Smith, Sr., Athens, Pa., assignor to
Ingersoll-Rand Company, Jersey City, N. J.,
a corporation of New Jersey
Application March 14, 1936, Serial No. 68,830
5
15
2o
25
'7 Claims. (01. 121-7)
This invention relates to rock drills, and more ends, respectively, of the piston chamber. The
particularly to rotation mechanism for rock drills pressure ?uid employed for this purpose is con
of the reciprocatory hammer type.
veyed to the valve chamber 35 by a supply pas
One object of the invention is to impart a step
sage 39 leading from a reservoir 40‘ in the back
by-step rotary movement to the working imple
head to the valve chamber 35, and flows to the
ment in order to change its position prior to the supply reservoir by a passage 4| leading from a
delivery of each blow of the percussive element throttle valve 42 in the back head 22.
thereagainsh
The pressure ?uid used for actuating the pis
Another object is to assure prompt engage
ton 24 is exhausted from the piston chamber 23
ment and disengagement between the locking through an exhaust port 44 controlled by the
10
elements of the rotation mechanism at the most piston 20.
t
suitable period in the cycle of operations of the
The rotation mechanism 33 employed for im
hammer piston.
parting a step-by-step rotative movement of the
Other objects will be in part obvious and in hammer piston and constructed in accordance
part pointed out hereinafter. ‘
with the practice of the invention comprises a 15
In the drawing accompanying this speci?ca
ring 45 seated upon the valve mechanism 34 and
tion and in which similar reference numerals re
secured to the cylinder, as by a pin 46 embedded
fer to similar parts,
partly in the ring and partly in the cylinder.
Figure l is an elevation in section of a rock
Within the ring 45 is the head 4'! of a rifle bar
drill embodying rotation mechanism constructed 48 which extends through the valve mechanism 20
in accordance with the practice of the invention, and is slidably interlocked with the piston 24 in
and
a 'well known manner. The head 41 is of smaller
Figures 2 and 3 are transverse views taken diameter than the interior of’ the ring 45 to de
through Figure l on the line 2-2 showing the ?ne an annular chamber 49 therebetween for
rotation mechanism in the released and engag
the reception of friction or braking elements 50‘.
ing positions, respectively.
Referring more particularly to the drawing,
the invention is shown embodied in a rock drill
comprising as casing parts, a cylinder 20, a
30 front head 2! and a back head 22.
The cylinder 20 is bored to provide a piston
chamber 23 for the accommodation of a recip
rocatory hammer piston 24. The piston has a
stem 25 which extends through a closure 26 in
.35 the front end ofthe cylinder and into the front
head 2! to deliver blows against a working imple
ment 2? guided by and interlocked with a chuck
28 rotatable in the front head. The chuck 28
and the stem 25 are provided with ribs 29 and
40 3B which interlockingly engage each other to
prevent relative rotation between the piston and
the chuck.
In the rear end of the cylinder 2i] is an en
larged recess 3! which is sealed at its rearward
45 end by the back head 22 and serves as a re
ceptacle for valve mechanism 32 and rotation
mechanism 33.
The valve mechanism which is disposed adja
cent the rear end of the piston chamber 23, and
50 forms a closure therefor, comprises a valve chest
34 which is recessed to provide a valve chamber
35 containing an oscillatory plate type valve 35.
The valve 36 controls the admission of pressure
?uid into the inlet passages 31 and 38 leading
55 from the valve chamber 35 ‘to the rear and front
The friction elements are in the form of ring seg
ments which are preferably of slightly less thick
ness than the width of the chamber 49 so that
they will be capable of a slight degree of lateral
movement in the chamber;
30
The outer surfaces 5b of the segments 50 are
roughened, as by knurling, in order to break up
any oil ?lm which may exist on the inner sur
face of the ring, thereby assuring ?rm and
prompt engagement of the segments with the ‘
ring 45.
In the form of the invention illustrated only
two segments are shown and, in order to main
tain them in constant readiness for frictional
engagement with the ring 45; spring-pressed
plungers 52 are disposed radially in the head 4‘!
to exert slight pressure against the intermediate
portions of the segments 50 and thereby press
the surfaces 5| lightly against the ring 45.
The adjacent ends of the segments 50 are par
allel and spaced with respect to each other to
de?ne therebetween spaces 53 into which ex~
tend the outer ends of spreaders 54. The spread
ers are preferably in the form of rectangular
plates presenting opposed ?at surfaces 55 and
56 which seat against the ends of the segments‘
50. The opposite ends of the spreaders extend
loosely into notches 51 in the head 41.
The entrance and rear or inner ends of the
notches 51 are flared in opposite directions to 55
2
2,109,979
provide an intermediate narrow portion 58 in
each notch of approximately the width of the
spreaders to act as fulcrums therefor.
The ex
tremities of the spreaders are suitably curved to
enable the spreaders to oscillate freely Without
hindrance from the adjacent surfaces.
The operation of the device is as follows: Let
it be assumed that the piston 24 is in its fore
most limiting position and about to initiate its
10 rearward stroke. Being slidably interlocked with
the ri?e bar 138, the piston, at the instant of
starting, imparts a slight rotary movement to
the ri?e bar and causes the head 1i? to tilt the
spreaders
The outer ends of the spreaders
15 will then act against the ends of the segments
50 and force the knurled surfaces 5! into ?rm
frictional engagement with the ring Q5. In this
way the ri?e bar f8 will be locked against rota
tion and, during its rearward stroke, the piston
20 will describe a partial revolution and shift the
working implement to a new position preparatory
to the delivery of a blow of the piston there
against.
At the instant of reversal of the piston in. the
25 rear end of the piston chamber the ri?e bar is
rotated sufficiently in an oppostie direction to re
lieve the pressure of the Spreaders against the
ends of the segments 58, thereby breaking the
frictional engagement between the segments and
30 the ring 155.
The rifle bar may then rotate freely
as the piston proceeds on its working stroke and
will not, therefore, hinder the speed of the pis
ton, and during the reverse movement of the ri?e
bar the segments 50 will be rotated to a new
35 position with respect to the ring (i5
by the
spreaders 54.
In practice, the present invention has been
3. In a rock drill having a casing and a piston
therein, rotation mechanism for the piston com
prising a stationary member in the casing having
a bearing surface, a ri?e bar interlockingly en
gaging the piston and extending into the sta
tionary member, friction means interposed be
10
tween the ri?e bar and the stationary member,
and means tiltingly interlocked with the ri?e bar
and the friction means and being actuated by
the ri?e bar for moving the friction means along
the bearing surface upon movement of the piston 15
in one direction and for pressing the friction
means into frictional engagement with the bear
ing surface upon movement of the piston in the
opposite direction, thereby preventing rotation of
the ri?e bar and causing the piston to describe 20
a partial revolution.
4. In a rock drill having a casing and a piston
therein, rotation mechanism for the piston com
prising a stationary member in the casing having
a bore, a ri?e bar interlockingly engaging the
piston, a head on the ri?e bar lying in the bore
and cooperating with the stationary member to
de?ne an annular chamber therebetween, ring
segments in the annular chamber, and means
tiltable in the head acting against the ends of ad- :
jacent segments for moving the ring segments
along the surface of the bore during movement
of the piston in one direction and to force said
segments into frictional engagement with the
stationary member to prevent rotation of the ri?e
bar during movement of the piston in the oppo
site direction and thereby cause the piston to de
found to function in an exceedingly e?icient man
ner. The gripping element of the rotation mech
scribe a partial revolution.
anism is quickly responsive to changes in the
therein, rotation mechanism for the piston com 40
prising a. stationary member in the casing having
a bore, a ri?e bar interlockingly engaging the
piston, a head on the ri?e bar lying in the bore
and cooperating with the stationary member to
de?ne an annular chamber therebetween, ring 45
segments in the annular chamber, and means
seated tiltably in the head for moving the ring
segments along the surface of the bore upon rota
direction of travel of the piston which controls
the rotation mechanism. A wide area of fric
tional contact exists between the segments and
the ring member so that wear caused by long
service of these elements will be negligible.
I claim:
1. In a rock drill having a casing and a pis
ton therein, rotation mechanism for the piston
comprising a stationary ring, a ri?e bar inter
lockingly engaging the piston, a head on the ri?e
bar lying Within the ring, friction members ar
ranged loosely about the periphery of the head,
means tiltably interlocked with the head and
arctuated thereby to force the friction members
into frictional engagement with the stationary
ring for locking the ri?e bar thereto during one
stroke of the piston and to release the friction
members to relieve friction between said mem
bers and the ring for releasing the ri?e bar dur
60 ing the succeeding stroke of the piston, thereby
causing the piston to described intermittent par
tial revolutions, and fulcra in the head engaging
the said means to cause tilting movement of said
means.
65
describe a partial revolution, and means acting
against the intermediate portions of the friction
members for constantly pressing the friction
members against the stationary member.
2. In a rock drill having a casing and a pis
ton therein, rotation mechanism for the piston
comprising a stationary member in the casing
having a bearing surface, a ri?e bar interlock
ingly engaging the piston and extending into
70 the stationary member, friction members inter
posed between the ri?e bar and the stationary
5. In a rock drill having a casing and a piston
tion of the ri?e bar in one direction and ex
tending between the ends of adjacent segments 50
whereby upon slight rotational movement of the
ri?e bar in the opposite direction the segments
are forced into ?rm frictional engagement with
the stationary member to lock the ri?e bar to the
stationary member.
55
6. In a rock drill having a casing and a pis
ton therein, rotation mechanism for the piston
comprising a stationary member in the casing
having a bore, a rifle bar interlockingly engag<
ing the piston, a head on the ri?e bar lying with 60
in the bore, friction members disposed between
the head and the stationary member, means tilt
ingly interlocked with and actuated by the ri?e
bar to force the friction members into frictional
engagement with the stationary member to lock 65
the ri?e bar to the stationary member, and fulcra
in the head engaging the intermediate portions of
said means to cause tilting movement of said
means.
member, means carried by the rifle bar for forcing
the friction members into frictional engagement
7. In a rock drill having a casing and a piston 70
therein, rotation mechanism for the piston com
prising a stationary ring, a ri?e bar interlock
ingly engaging the piston, a head on the ri?e bar
with the bearing surface, thereby preventing rota
75 tion of the ri?e bar and causing the piston to
lying within the ring, ring segments between
the head and the stationary ring and having 75
2,109,979
knurled surfaces adapted to seat against the ring,
means tiltingly interlocked with the head and
the segments to actuate the segments for pressing
the knurled surfaces into frictional engagement
with the stationary ring, thereby preventing rota
tion of the ri?e bar and causing the piston to
3
describe a partial revolution, andi spring-pressed
plungers in the head constantly acting against
the intermediate portions of the ring segments
to press said ring segments against the stationary
ring.
WILLIAM A. SMITH, SR.
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