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Патент USA US2121563

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June 21, 1938.
Filed Aug. 14, 1936
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Patented June 21, 1938
George H. F‘uehrenvPhillipsburg, N. J., assignor
‘ to IngersolléRand Company, Jersey City, N. J.,
‘a corporation of New Jersey
' Application. August 14, 1936, Serial No. 95,961
3 Claims.
This invention relates to braking devices, and
more particularly to'a braking device ‘for. the
feeding mechanism of a rock drill.
One object of the invention is to prevent un
5 authorized movement of the rock drill withre
spect to the mountingwhereby it is supported.
Another object is to control the rate of move
ment of the rock drill with respect to its mount
Other objects will be in part obvious and in
part pointed out hereinafter.
In the drawing accompanying, this speci?ca
tion and in which similar reference numerals
refer to similar‘ parts,‘
Figure l is a longitudinal elevation of a por
tion of a rock drill, its mounting and the feed
ing mechanism controllingthe movement of the
rock drill with respect to its mounting,
20 Figure 1
Figure 2
2 is a
on the
3 is a
on the
transverse view taken through
line 2--2, and
transverse view taken through
line 3-3.
Referring more particularly to the drawing,
26 designates, in general, drilling mechanism
25 comprising a rock drill 2|, a mounting for the
rock drill in the form of a shell 22 and a feeding
mechanism 23 for controlling the movement of
the rock drill with respect to the shell 22.
The rock drill, of which only a portion is shown,
30 is of the hammer type in which a reciprocatory
piston 24 in a cylinder 25 actuates the working
implement (not shown). The rock drill may be
slidably interlocked with the shell 22, in a well
known manner, and carries a nut 26 which is in
35 threaded engagement with a feed screw 21 sup
ported by the shell. The nut 26 may be suitably
threaded for the accommodation ‘of a nut 33
whereby the ‘ratchet wheel is clamped to the
feed screw. .A suitable controlling member 34
is arranged in the casing to control the pawl
devices and thereby determine the directionin
which the feed screw may be. rotated by the jars
applied thereto by the rock drill.
Inaccordance with the practice of the inven- '
tion, the feed screw is provided with a braking
device to control the rate of feeding movement 10
of the feed screw. The braking mechanism com
prises a friction band 35 disposed, for example,
about a hub portion 36 of the ratchet wheel. The
friction band preferably consists of a single ?ex
ible member having a gap or space 31 between 15
its ends which lie beneathv the hub portion 36.
In the periphery of the band‘ and on opposite
sides of the space 31 are notches 38 of which one
forms a seat for an end of an adjusting screw 39
threaded into the casing 28 and having a lock
nut 48 thereon to lock the screw 39 securely in
On the side of the casing opposite to that con
taining the screw 39 is an enlargement 4| hav
ing a recess 42 of which the outer end is pro
vided with threads 43 for the accommodation of
a hollow plug 44. Arranged within the plug 44
is a rotary member 45 having an external ?ange
46 at its inner end, and between the ?ange 46 >
and a shoulder 41 of the plug 44 is a friction
member 48 against which the adjacent end of
the flange 46 bears. The rotary member 45 ex
tends exteriorly of the plug 44 and carries a
lever 49 whereby the rotary member may be
In the inner portion of the rotary member
affixed to the rock drill and the threads of the ‘ 45 is a threaded recess 58 to accommodate the
nut and the feed screw are of such inclination threaded end 5| of an actuator or transmission
that when a force is applied to the rock drill member 52 slidable in the casing and engaging,
40 tending to actuate it longitudinally of the shell
the feed screw 21 will be caused to rotate.
The feeding mechanism 23 is of substantially
the type illustrated in United States Patent No.
1,867,929 granted to W. A. Smith, Sr., July 19,
45 1932.
It comprises a casing 28 attached to the
rearward end of the shell 22.
The casing pro
with its opposite end, the notch 38 in the adja
cent portion of the friction band 35. On the pe
riphery of the actuator is a ?ange 53 carrying
lugs 54 which extend slidably into notches 55
in the recess and engage the surfaces de?ning
the notches 55 for preventing rotation of the
actuator 52 with respect to the casing. A spring
vides a bearing 29 for the feed screw 28 of which
56 seated upon the innermost wall of the recess
the rear end extends through the casing. The
casing 28 contains suitable pawl and ratchet de
50 vices of substantially the type described in de
tail in the aforesaid patent and of which the
42 and the ?ange 53 acts constantly to press
the ?ange 45 against the friction member 48.
In the operation of the device and with the
piston 24 of the rock drill-in action the jars re
sulting upon reversal of the piston in the ends
ratchet wheel 3| is mounted on the feed screw.
The feed screw has a tapered portion 30 ex ' of the cylinder are transmitted to the casing of
tending into a tapered bore 32 in the ‘ratchet the rock drill and tend to actuate the rock drill
55 wheel and the extremity of the feed screw is longitudinally of the feed screw 21. The direc 55
tion in which these forces may act for moving
the rock drill along the shell 22 may be readily
determined by means of the control member 34,
as may be ascertained by reference to the here
5 inbefore mentioned patent.
It may be stated herein, however, that when
the control member 34 occupies one controlling
position the shocks to which the rock drill is sub
jected by the piston 24 during its reversal in
one end of the cylinder will cause the feed screw
to rotate in one direction and a reverse move
ment of the feed screw may be obtained by shift
ing the control member to another limiting posi
tion, it being understood, of course, that the
15 threads of the feed screw and the nut are of
non-locking inclination.
If, during the operation of the drilling mecha
nism, a comparatively slow feeding movement
of the rock drill be required the rotary member
45 may be rotated to move the actuator 52 in the
direction of the screw 39 and thereby contract the
friction band 35 on the hub 36. The degree of
rotary movement of the rotary member depends,
of course, upon the braking force required, but
25 such movement of the rotary member 45 does not
alter its position with respect to the friction mem
ber 48 against which it is constantly pressed by
the spring 56. The rotary member will, there
fore, remain immovable in all positions unaf
30 fected by the vibrations incident to the operation
of the rock drill.
In operations requiring the arrangement of the
drilling apparatus in a vertical position, as when
drilling downholes, the braking device may serve
35 to hold the feed screw immovable.
In such case
the brake manipulating devices are adjusted to
lock the friction band 35 on the hub portion 36.
This is particularly desirable when changing
working vimplements as it de?nitely holds the
rock drill against unauthorized descending move
ment and obviates the chances of injury to the
I claim:
1. A braking device, comprising a casing, a
brake band therein, extensible means for impart
ing braking action to the brake comprising a
rotary member and a non-rotary member in en 10
gaging contact with the brake band and being in
slidable engagement with the casing, and means
for e?ecting movement of the non-rotary mem
ber’ longitudinally of the rotary member upon
rotation of‘ the rotary member.
2. A braking device, comprising a casing, a
brake therein, an actuator for the brake slidably
interlocked with the casing, a rotary member in
the casing in threaded engagement with the actu
ator for shifting the actuator, a friction member
in the casing, and a spring for pressing the rotary
member into frictional engagement with the fric
tion member to prevent unauthorized movement
of the rotary member.
3. A braking device, comprising a casing, a
braking band, an actuator for the braking band
slidable in the casing, interlocking means on the
actuator and the casing to prevent rotary move
ment of the actuator, a rotary member in the eas
ing in threaded engagement with the actuator 30
for shifting the actuator, a ?ange on the rotary
member, a friction member in the casing for the
?ange, and a spring acting against the casing and
the actuator to press the ?ange into frictional
engagement with the friction member.
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