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Патент USA US2108989

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ROTATION MECHANISM
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Fil’ed March 22, 19:57
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2,108,989
Patented Feb. 22, 1938
UNITED STATES FA'EENT DFFICE
2,108,989
ROTATION MECHANISM
Albert R. Mack, Easton, Pa., assigner to Inger
soll-Rand Company, `Iersey City, N. J., a cor
poration of New Jersey
Application March 22, 1937, Serial No. 132,911
9 Claims. (Cl. 121-!7)
This invention relates to a rotation mechanism
for rock drills of the type in which the working
implement and the piston actuating it are ca
pable of free reciprocatory movement with re
.
5 spect to each other.
More particularly, the invention relates to a
rotation mechanism adapted to effect a step-by
step rotary movement of the working implement
between blows cf the percussive element, and
10 an object of the invention is to assure a free ac
tion of the percussive element so that it will be
unhampered by the drag of the rotating parts of
the drilling mechanism.
Another object is to enable the percussíve pis
15 ton to at all times travel its nominal distance ir
respective of the degree of rotary movement of
the rotational parts.
Still another object is to equip the rock drill
with a powerful rotation mechanism which may
20 be of rugged construction and positive in action.
Other objects will be in part obvious and in
part pointed out hereinafter.
In the drawing accompanying this specifica
tion and in which similar reference numerals re
25 fer to similar parts, A
Figure 1 is a longitudinal elevation, partly in
section, of a rock drill equipped with rotation
mechanism constructed in accordance with the
practice of the invention,
Figure 2 is a transverse view taken through
30
Figure 1 on the line 2_2, and
Figure 3 is a perspective view of the rotation
mechanism.
Referring to the drawing, 20 designates a rock
35 drill comprising a cylinder 2l and front and back
heads 22 and 23, respectively. These parts con
stitute the casing of the rock -drill and may be
held together in any suitable manner, as by side
bolts (not shown) extending along diametrically
40 opposite sides of the rock drill.
The cylinder 2l is bored to provide a piston
chamber 24 having a free exhaust port 25 which
is controlled by a hammer piston 28 reciprocable
in the piston chamber. The hammer piston 26
45 is of the differential type and has a plain cylin
drical stem 2l on the forward end thereof to de
liver blows to a working implement 28 extending
into the front head 22.
The stem 2l extends slidably through a bush
ing 29 carried by a head 30 inserted in the front
end of the cylinder to form a closure for that end
of the piston chamber 24. On the periphery of
the head 30 is a iiange 3l which lies between the
cylinder 2! and the front head 22 and has a ho-l
low extension 32 extending into the rear end of
the front head 22 to centralize the front head
with respect to the cylinder.
In the cylinder 2l, rearwardly of the piston
chamber 24, is an enlarged recess 33 for the ac
commodation of a valve chest 34. The valve
chest forms a closure for the piston chamber and
has a chamber >35 containing a distributing valve
3G whereby the distribution of pressure fluid to
the piston chamber 24 is effected.
rl‘he valve 36 is illustrated as being like that
forming the subject matter of United States Pat
ent No. 2,048,957 granted to W. A. Smith, Sr.,
et al, and accordingly has a plurality of channels
3l in its wall through which pressure fluid flows
to inlet passages 38 in the valve chest and leading 15
to the rear end of the piston chamber 24.
The pressure fluid employed for driving the
piston rearwardly passes over the rear end of the
valve to an inlet passage 39 communicating with
the front end of the piston chamber through a
branch passage 40. On the periphery of the valve
35 is a flange 4l of which the opposed end sur
faces act as actuating surfaces for throwing the
valve. The pressure Huid acting against these
surfaces is conveyed thereto by cross-kicker pas
sages 42 and 43 leading from` the piston cham
ber 24, at points forwardly and rearwardly, re
spectively, of the exhaust port 25, to the cor
responding sides of the flange 4|.
The pressure fluid distributed b-y the valve is
conveyed the-reto by supply passages 44 in the
valve chest and opening into a supply reservoir
45 in the front end of the back head 23. In the
back head 23 is a throttle valve 4l, of the rotary
type, having a bore 48 which may be in constant
communication with a source of pressure fluid
supply, and in the wall of the throttle valve 48
is a port 49 to register with a passage 50 opening
into the supply reservoir 45.
In accordance with the practice of the inven
tion, t Ae chuck, designated in general by 5l and
serving to guide and maintain the working im
plement 23 in coaxial alignment with the ham
pfîst-on 2G,
journalled with its front end
in a bore
in the end wall of the front head
22, and a sleeve 53 press-fitted into the head 30
against the bushing 29 serves as a bearing for
the rear end of the chuck.
.
For illustrative purposes, the chuck is shown
chambered to accommodate a lugged working “
implement.
It comprises a lchuck jaw 54 which
extends into a chuck sleeve 55 and the rear end
of the latter is the portion of the chuck mech
anism that is journalled in the sleeve 53. With
in the chuck sleeve is a bushing 56 to guide the
2
2,108,989
shank end of the working implement 28 and tuating surface l2, moves the piston 62along the
which extends into a cavity 51 in the chuck sleeve splines 60 of the chuck sleeve to its rearmost lim
to receive the blows of the hammer piston 26. iting position.
In order that the chuck jaw 54 and the chuck
Shortly prior to the delivery of its blow against
Cn sleeve 55 may be held against rotary movement ' the working implement 28 the piston 26 uncovers
with respect to each other the chuck jaw is pro
the exhaust port 25 and the pressure ñuid em
vided on its peripheries with longitudinally ex
ployed for actuating both pistons, in the direc
tending ribs 58 to interlockingly engage intro
tions described, is then exhausted to the atmos
verted ribs 59 on- the chuck sleeve 55.
phere. Upon the subsequent admission of pres
On the peripheryV of the chuck sleeve 55 are
sure fluid to the front end of the piston cham 10
a plurality of spiral splines 6€! to interlockingly ber 2,4, for driving the piston 26 rearwardly to
engage similar splines El on the inner surface
of a sleeve or piston 62.
The piston B2 is ar
its initial position, pressure fluid also passes into
the rear end of the piston chamber 63 and acts
ranged within an annular piston chamber 63
against the actuating surface ’13.
for which the peripheries of the sleeve 53 and
the chuck sleeve 55 form the inner Wall and the
extension 32~ and the wall of the front head 22
constitute the outer bounding surface. The
is then driven forwardly.
15
During its forward movement the piston 62
is restrained against rotation by the pawls 69.
front and rear ends of the said piston chamber
are closed by the front head and the head 3l),
respectively.
In the arrangement shown, the inner surface
54 of the extension 32 serves as a guiding sur
face for the rearward portion of the periphery
of the piston 62, and the piston carries an in
troverted frange having a surface 65 which slides
on the periphery of the sleeve 53.
To the end that the piston 62 may be caused
to impart a step-by-step rotary movement to the
chuck mechanism and; therefore, to the work
ing implement 28, the piston 62 is further pro
vided on the forward portion of its periphery
with a series of longitudinally extending ribs 65
'I'he piston 62
which will then engage the teeth 10, and the
spiral splines 6l will cause the chuck mecha
nism to rotate in anti-clockwise direction, as 20
Figure l is viewed from the right hand side.
Thus, the working implement is shifted to a new
position during the rearward stroke of the ham
piston 26 and will Yoccupy a new position on
the working face for the subsequent Working 25
stroke oi the hammer piston.
When the hammer piston again uncovers the
exhaust port 25 the pressure fluid used for ac
tuating it together with that acting against the
actuated surface 'i3 of the piston 62 is exhausted 30
to the atmosphere thus completing the cycle of
operations.
In practice, the present invention has been
which are in slidable engagement with similar
ribs 6l' on the inner surface of a ratchet ring
found to be a highly desirable device for effecting
a step-by-step rotary movement of the working
58 encircling the piston 62. In the same trans
verse plane as rthe ratchet ring and journalled in
the adjacent portion of the front head 22 are
implement. It has the desirable advantages that
a powerful rotative vforce may be applied tol-the
working implement and that the piston 26 is at
all times entirely free tol complete its nominal
stroke, irrespective of the degree of rotative move
ment of the chuck. In other words, should the
rotation mechanism encounter undue resistance
pawls 69 to engage the teeth 'Hl on the periphery
of the ratchet ring. The pawls 69 are suitably
inclined to assure full areas of contact between
their ends and the sides of the teeth 'i6 and are
constantly urged toward engagingV position by
spring-pressed plungers 'Il in the front head 22.
The piston 62, like the piston 26, is actuated
by pressure fluid and the front and rear ends
of the piston 52 accordingly constitute actuating
surfaces 'l2 and T3, respectively, against which
pressure fluid acts for reciprocating the piston.
The pressure fluid employed for this purpose is
preferably supplied to the actuating surfaces si
multaneously with the admission of pressure fluid
to the ends of the piston chamber 24 so that the
movement of the two pistons may be controlled
by th-e same valve mechanism. In order to as
sure this result the inlet passage 3S is extended
to its movement so that the piston 62 will be
caused to short-stroke the piston 26 may con
tinue its normal action and thus, together with
the impulses alternately applied to the ends `of
the piston 52, assist in again freeing the working
implement from the binding material.
I claim:
1. Rotation mechanism, comprisingV a casing,
a rotatable chuck member, a reciprocatory mem
ber on the outside of the rotatable chuck mem
ber, means on the members slidably interlocked
with each other and being adapted to effect rela
tive rotary movement between the members upon, 55
reciprocation of the reciprocatory member, `and
beyond the passage »'¿59 and through the cylinder
means for preventing rotational movement of
and the head 3l) and opens into the rear end of
the
the piston chamber 63.
CO
The pressure iiuid supplied to therfront end
of the piston chamber 63 for driving the piston
A62 rearwardly is conveyed thereto by a passage
'i4 preferably leading from the rear end of the
piston chamber 63 through the cylinder 2B, the
flange 3! and the front head ‘22 to the front end
of the piston chamber 63.
The operation of the device is as follows: With
the valve 36 in the position illustrated pressure
fluid flows from the throttle valve through the
T l) passages 3l, thence through the ports 38 into the
rear end of the piston chamber 24 and drives
the piston 25 forwardly against the working im
plement 28. At the same time pressure fluid flows
through the passage ‘I4 into the front end of the
piston. chamber 53 and, acting against the ac
reciprocatory
member
during
alternate
strokes thereof and thereby cause said reciproca
tory member to impart rotary movement to the 60
rotatable chuck member.
2. Rotation mechanism, comprising a casing, a
rotatable chuck member, a reoiprocatory member
encircling the rotatable chuck member, means
on the members slidably interlocked with each'
other and being spiralled to effect relative rotary
movement between the members upon reciproca
tion of the reciprocatory member, and means
for preventing rotational movement of the recip
rocatory member during alternate strokes 70
thereof and thereby cause said reciprocatory
member to impart rotary movement to»` the ro
tatable chuck member.
3. Rotation mechanism, comprising a casing,
a _rotatable chuck member, reciprocatory means 75
2,108,989
rotatable in the casing encircling the rotatable
chuck member and being in splined engagement
therewith, means for vaiving pressure ñuid to the
ends of the reciprocatory means for actuating said
reciprocatory means, and means controlling ro
tational movementl of the reciprocatory means to
enable said reciprocatory means to impart rota
tional movement to the rotatable chuck member
during alternate strokes o-f the reciprocatoryf
10 means.
4. Rotation mechanism, comprising a casing,
a rotatable member, reciprocatory means rotat
able in the casing encircling the rotatable mem
ber and being in spirally-splined engagement
15 therewith, opposed actuating surfaces on the
reciprocatory means intermittently subjected to
pressure ñuid for actuating said means, and
means for preventing rotary movement of the
reciprocatory means during alternate strokes
thereof and thereby cause a rotary movement of
the rotatable member.
5. Rotation mechanism, comprising a casing, a
rotatable member, a reciprocatory means en
circling the rotatable member rotatable in the
25 casing and in spirally-splined engagement with
the rotatable member, opposed actuating surfaces
on the reciprocatory means intermittently sub
jected to pressure iiuid for actuating said means,
and ratchet and pawl devices for preventing ro
tary movement of the reciprocatory means during
alternate strokes thereof and thereby cause a ro
tary movement of the rotatable member.
6. In rotation mechanism for rock drills, the
combination of a casing and a hammar piston
therein, a chuck in the casing, an annular piston
rotatable in the casing encircling the chuck and
being in spirally-splined engagement therewith,
means for valving pressure ñuid to both pistons
for actuating said pistons, and means controlling
3
rotational movement of the annular piston to
impact rotational movement to the chuck during
one of the strokes of the annular piston.
7. In rotation mechanism for rock drills, the
combination o_f a casing and a hammer piston
therein, a chuck in the casing, an annular piston
rotatable in the casing encircling the chuck and
being in spirally-splined engagement therewith,
means for supplying pressure fluid to the pistons
to cause said pistons to move simultaneously in 10
opposite directions, and means controlling rota
tional movement oi the annular piston to impart
rotational movement to the chuck during one of
the strokes of the annular piston.
8. In rotation mechanism for rock drills, the 15
combination of a casing and a hammer piston
therein, a chuck, a second piston reciprocable and
rotatable in the casing and being in spirally
splined engagement with the chuck, means for
supplying pressure iluid to the pistons for actu
ating said pistons, and means for preventing ro
tational movement of the second mentioned pis
t0n during one of its strokes and thereby cause
said second mentioned piston to impart rotary
25
movement to the chuck.
9. In rotation mechanism for rock drills, the
combination of a casing and a hammer piston
therein, a chuck, an annular piston rotatable in
the casing encircling the chuck and being in
spirally-splined engagement with the chuck,
means for supplying pressure ñuid to the pistons
for actuating said pistons, a ratchet ring, means
on the ratchet ring and the chuck forming a
slidable interlocking connection therebetween,
and abutment means to hold the ratchet ring sta 35
tionary during one of the strokes of the annular
piston and thereby cause said annular piston to
impart rotary movement to the chuck.
ALBERT R. MACK.
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