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Патент USA US2124627

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July 26, 1938.‘ _
Filed July 30, 19:57
2 Sheets-Sheet l
1%. .“
' '_
July 26, 1938.
ROCKVDRILL mzvcxmusu
Filed July 50, 19:57
.6’ 36' 81
2 sheets-sheet 2
6’ .525),
Patented July 26, 1938
ROCK lmulr?onANlsmEaston, Pa, assignor to
William A. Morrison,
Ingersoll-Rand Company,
1 "
Jersey City, N. J., a
corporation of New Jersey >
Application July 30, 1937, Serial No. 156,436
6 Claims. (Cl. 121-5)
This invention relates to rock drilling mech
anisms, and more particularly to rock drilling
The chuck mechanism 33 may be of any well
known type adapted to interlockingly engage the
working implement so- that upon the imparta
tion of the, rotary movement to the chuck 33 the UK
working implement will also be rotated in order
mechanism embodying rotation mechanism for
rotating the working implement and feeding
5 mechanism for actuating the rock drill relatively to rotate its cutting end to new positions be
to its support.
tween blows. of the hammer piston 21. A well
One object is to assure the correct relation
vknown example of such‘ chuck mechanism is that
ship of the rock ‘drill and the hammer piston with generally known as the. ‘fLeyner” type in which
respect to the working implement‘ which the , the chuck interlocks with lugs on the working
' implement to cause the two to rotate in unison
hammer piston actuates.
Another object of the invention is to utilize
the force of the hammer piston of a rock drill for
actuating both the rotation mechanism and the
feeding mechanism.
Still another object is to use an element or ele
ments of the rotation mechanism for transmit
ting the force of the hammer piston to the feed
ing mechanism.
Further objects will be in part obvious and in
20 part pointed out hereinafter.
In the drawings accompanying this speci?ca
tion and in which similar reference numerals
refer to similar parts,
Figure 1 is a longitudinal view, partly in
section, of a rock drilling mechanism constructed
25 in accordance with the practice of the invention,
Figure 2 is a view similar to Figure 1 show
ing a detailed view of the elements employed
for transmitting power from the hammer piston
to the feeding mechanism,
Figures 3, 4, 5 and 6 are transverse views
taken through Figure 1 on the lines 3-—3, 4--4,
5-5 and 6-6, respectively, and
Figure ‘7 is a plan view, in section, taken
and the working implement is capable of a limited degree of reciprocatory movement relatively
to the chuck.
In the rearward end of the cylinder 25 is an '
enlarged recess 36 to accommodate valve mech
anism 31 of which only the chest is shown. The
valve mechanism may be of any well known type
and the rock drill may be provided with the
usual ports and passages (not shown) controlled
by the valve mechanism vto distribute pressure
fluid to the ends of the piston chamber foractu
ating the piston 21.
The valve mechanism is held against rotary
movement with respect to the cylinder 25 by a 25
key 38 engaging these elements and is held
against endwise movement by a plate 39 over
lying the rear end of the cylinder 25. The plate
39, vmoreover, serves as a seat for a back head
40 whichconstitut'es-the rearmost ‘casing part
of the rock drill and is securedtd the cylinder
by the usual side rods 4|‘ arranged on opposite
sides of the rock drill. >
The rock drill is provided with suitable means
for imparting rotary‘ movement to the piston ‘21 35,
and thus to the chuck mechanism interlocked
Referring more particularly to the drawings; therewith. That illustrated and designated 42
20 designates a rock drilling mechanism com-. is in the form of a bar extending through the
prising a rock drill 2| and a shell 22 to guide the plate 39 and the valve mechanism 31 into the
rock drill and accordingly having a pair of guide
piston 21, ‘and theyportion of the bar lying with
ways 23 to slidably receive ribs 24 carried by the in the piston is provided with spiral ribs 43 to
casing parts of the rock drill 2|.
interlockingly engage similar ribs (not shown)
The rock drill 2| comprises the usual cylinder in a nut 44 threaded into the piston 21.
25 having a piston chamber 26' to accommodate
On the rearward end of .the' bar is a head 45
a reciprocatory hammer piston 21 which con
‘which carries a series of pawls 46 of conventional 45
trols a free exhaust port 28. The hammer piston type having trunnions 41 seated in the head 45
through Figure 6 on the line 1-1.
has a reduced stem 29 to deliver blows against a
working implement, as for example a drill steel
(not shown), but the vend of which may extend
into the front casing part or front head 30 ar
to serve as pivots for the pawls. The wing por
tions 48 of the 'pawls lie in recesses 49 in the
periphery of the head 45 and are urged outwardly
by spring-pressed plungers 50 slidable in the head
ranged at the forward end of the cylinder 25.
The front head 30 and the cylinder 25 are
The head 45 is arranged in a recess 5| in the
separated by a front cylinder washer 3| having‘ back head 40 and‘is encircled by a. ratchet ring
bosses on its ends extending into the adjacent 52 which, in accordance with the practice of the
ends of the front head and'the cylinder and also invention, is rotatable within the recess and has 55
having a bore 32 to guide the stem 29. The ‘a smooth cylindrical bearing portion 53 that
front head 30 houses suitable chuck mechanism seats upon the wall of the recess 5|. The teeth
33 having ribs 34 which are slidably engaged by 54 of the ratchet ring, and which the pawls 40
ribs 35 extending longitudinally of the piston are intended to engage, are located on and ex
stem 29 to prevent relative rotary movement be
tend'along the entire inner surface of the ratchet 60
60 tween the piston 21 and the‘ chuck 33;.
.. ring. Their side surfaces, as/is customary, serve
as seats for the ends of the pawls 46 to prevent
relative rotary ‘movement in onedirection be
’ tween the bar 42 and the ratchetring’52. ' '
other of the feed nut to assure an ample area
of engagement between them and those of the
feed screw upon which the
feed nut 69 is thread
‘ed. Preferably plates '11 aredisposed at the ends
S'uitable means are provided to enable the di
of the feed nut 69 to protect the lugs H" and ’
rection of rota'tionof the’ ratchet ring 427 tobe ,
against the eifects of wear incident to the
‘selectively controlled?To this end a block '55~
‘movement of the ‘feed nut.
is disposed in
the ratchet ring, rearwardly' of the '
I 'The pressure fluid-employed for actuating the
head ‘45, to provide bearings forjtwo sets ‘of
spring-pressed pawlsrr56 >and‘j51' of whichr'the
piston may be conveyed to the rock drill through
, pawls designated 56 are‘ arranged to engageone
side ofv the ratchet‘teethJ54 and the pawl or
pawls 51 is positioned to act as abutments for
' the opposite sides of the teeth 54.
Preferably, a
a suitable conduit (not/shown) and its admis-' 10
‘sion into therock drill'is
controlled by a throt- '
tle valve 18 arranged in the back head 44. The
throttle valve is shown as being of the rotary
plate’ I5 is interposed between the head-‘l5 and‘ type having a central chamber 79 which may
be in constant communication with the source
the block 55 toretain the pawls intheir respec
of pressure ?uid supply,
and a‘ port 89inW-the
The block 55 maybe held flxedlyin position
in any suitable -manner,._as, ' for example,> by
'20 “seating
a‘stem IQ of theblock55 in iaybore l8
in the back head and ?rmly securing the stemv l9
to the Vbacknhead 40, with a‘rkey l7 ‘extending
'wall 'of the throttle valve affords ‘communica
tion between the chamberg‘lB and a supply'pasé
_ 1 sage .8! extending through the back; head 40and ~20 .
the'plate 39 and opening into a supplyreservoir
82' in the end of the platel39 adjacent the-valve
transverselyof the back headand bngaging-ja mechanism 31.
J, The rock drill is, moreover, provided withla"
notch 16 in ‘the periphery- ofrltheqsftemllih ‘~ 1
; Means are provided-for controlling engage»
,mentjof the pawls 56 and 5'! with the teeth 54.
' v To this end a plate 58;i§sjarranged'rotatably-jin
theback head rearwardly of
the, block .55.. ‘The
waterztubel8l3:which extends through the back ,, .
head and the percussive element to convey‘
cleansing water to they working implement ‘for '
flushing the hole being drilled. : The water tube
carries a pair of- Wings 59 which overlie. is heldv ?xedly in position by a plug B4‘threaded "
portionsof the pawls 56 and :51 extending rear
into the rear end of thesbacklhead and/seating '
' wardly of theblock 55. The wings 59 will; upon 7 against the adjacentend' of vthe water tube.‘ A
.manipulation'v of the plate 58-, engage'the free . passage 85 in the back head affords communica-V
tion between the watertube and a supplycon
nection 86' attached to the back head. ' »
The operation of the device'is as follows:
ends of the pawls? and rock‘ them outnof'the
path of movement of the teeth 54.
7 =
:30 V
' i
Any suitable meansmay be pro ided for‘ eifect
it be'assumed that the rock drill 20 is in; oper $35
ring rotary movement ofthe plate. That illus
vtrated comprises a shaft 60 arranged inthezback iation so that the hammer’ piston 21 isjrecipro
' head '401and having anVeccentric‘pin-BI ‘which ' eating within the cylinder to deliver blows to’ the
working implement, also that the'plate‘58 occu-'
' 'extendsinto'a' slot 62 in the‘rearmost'endof ‘the
pies a position inrwhich'a wing 59 holds'jthe ]' >
pawl '51 out'of the path’ of therratchet teeth 54 A0
plate 58, preferably near the periphery thereof.
The shaft 69 extends exteriorly of the back head
and that the pawls 56_'are free to engagethe?'i
' and carries a lever 63 whereby-it may be manipu
V V In’ order ‘that therplate 58 may be held?xedly
.injeither of its limitingposition's, that is; in the
positions 'in' which itholds the ipawls .56,’ or that
"designated~51,l inr'disengaging position,‘ the plate
: 58> is provided in its rearward end (with depres
ratchet teeth. Under'these conditions
ling the forward stroke ofthe hammer piston'the ' ;
unimpededto strike: against the working imple- I’
ment,;it being understood, of course; that ‘the
' ‘sions 64,>of;which'o_n1y ‘one'is shown; to receive 'bar 42 will then rotate freely with respe‘ctto. ‘
the end-of‘ a springepressed plunger 65 arranged
'7 ‘in.
~ As
back head
in 40.7
the recess
p 5|, the_ ratchet
_ } ' ring
the} ratchet ring and the’ pawls 46 will-Fmerely
pass over the crests of theteeth '54. l'I'he‘pawls
will, however, bexinvconstantreadinessL'for ~
engagement with the teeth 54,°as will alsorbe ‘
and thisv move‘;
ment of the .ratchetring is employed “in the the pawls .56.; Thus, when thepiston 21. reverses
'form of theinvention illustrated; for imparting in the front end of the piston chamber 25‘and
feedingm'ovement to the rock drill for ‘actuating by its act of 'reversalimparts a shock or jar to.
_ ‘it alongfthe shell22~ in orderto maintain the
percussive element of the‘ rock drill in ‘a :favor
:the rock drill the feed
able position with respect'to the working imple
ment. 1' The ratchet ring is accordingly provided’
ings, and thereby enable the rock drill to be
moved along the shell 22 towardithe workbyi the
an idler pinion 51-journalled in the‘vback'head I force of the hammerv piston; The ratchet ring,
with gear teeth 66 on its periphery to mesh with
44_and the'plate 39' and meshing with 1teethq68
‘ being connected to the feed nut'through the pin-I;
in the periphery of a feed-nut 69 rotatabler'in ion 61; will also rotate in'the same direction as
a bore 10 located, in the present instance,fin lugs the feed nut and its teeth 54 will merely de
press .the‘pawls 56 astheypass over the‘freea' 16,5
‘H and" on the back head and the plate 39'."
The lugs, "H and 12 extend into the>.-'shell“22 - endsof the'pawls.
Upon reversal of the piston the spiral engage
and the bore 191's coaxial with'a feed screw 13
extending longitudinally ofithe shell 22.‘ The ' ment between it and ‘the bar 42'c'auses the bar to
feed screw is supported at its ends'bysuitable
bearingsiof' which only one; designated 14, is
7 ‘shown at the rearward end of theshell to which
it may be suitably locked by a key 15;
V The ‘threads 16 of thefeed nut are of vnon
locking pitch and extend from~ one end "to; the
rotate in a direction“- to bring the ends ofsthe
pawls’ 46 into‘ abutting relationship ‘with the 7.0 1
teeth 54 and,in consequencea thrust is impart
'ed' to the ratchet ring 52 which willcause it to
rotate. This movement of the ratchet‘ring'is
transmitted through the pinion. 61 to the feed
nut 69 which will then berotated furtherv in a
tion of a rock drill and a guide therefor, a feed
clockwise direction to advance it and the rock
drill toward the work.
ing mechanism for moving the rock drill relative
ly to the guide and comprising a pair of members
The distance which the rock drill is initially * in threaded engagement with each other, a ham- ‘
moved forwardly along the shell by the force of
the hammer piston 21 at the beginning of its
rearward stroke depends, of course, upon the de
mer piston reciprocable in the rock drill apply
gree of penetration of the working implement
into the rock at each blow of the hammer piston
but, in any case, the rock drill is moved forward
10 ly, by the jar occasioned by the hammer piston
and by the subsequent thrust against the ratchet
ring, the distance required to bring the percus
ing jars thereto to move the rock drill along the
guide, and rotary means actuated by the ham
mer piston during alternate strokes thereof for
rotating one of the members to assist in moving
the rock drill in one direction.
2. In a rock drilling mechanism, the combina
sive element within the correct striking dis
tance of the working implement. In practice,
15 this ?nal forward movement of the rock drill has
been found to be fully accomplished immediately
after the beginning of the rearward stroke of the
hammer piston.
After the described movement of the feed nut
20 has been effected the rock drill will be de?nitely
tion of a rock drill and a guide therefor, a ham
mer piston in the rock drill, feeding mechanism
for moving the rock drill relatively to the guide,
restrained against further forward movement by
the abutting surfaces of the working implement
and the chuck mechanism. In consequence, the
feed nut 69 and the parts connected thereto are
25 incapable of further rotary movement. The
ratchet ring 52 will, therefore, remain station
and means actuated by the hammer piston and 15
operating to actuate the feeding mechanism to
move the rock drill counter to the direction of
movement of the hammer piston.
3. In a rock drilling mechanism; the combina
tion of a rock drill and a guide therefor, a feed
screw on the guide, a feed nut in the rock drill
in threaded engagement with the feed screw, a
hammer piston reciprocable in the rock drill
applying jars thereto to move the rock drill
along the guide, and means actuated by the ham 25
ary, as will also the bar 42. The piston 21 will
then rotate relatively to the bar 42 during the
remainder of its stroke and rotate the chuck
30 33 and the working implement to a new position.
When the piston reverses in the rear end of the
piston chamber a jar is, of course, also imparted
to the rock drill but this force will be ineffective
to shift the rock drill by reason of the engage
35 ment of the paw1s56 with the teeth 54. These
elements will then prevent reverse movement of
the ratchet ring 52 and thus the movement of the
feed nut 69 necessary to effect or permit retro- .
grade movement of the rock drill.
The described cycle of operations is repeated
mer piston during alternate strokes thereof for
rotating the feed nut to assist in moving the rock
drill relatively to the guide.
4. In a rock drilling mechanism, the combina
tion of a rock drill and a guide therefor, feed an
ing mechanism for the rock drill comprising
a stationary member and a rotary member in
threaded engagement with the stationary mem
ber, a ratchet ring rotatable in the rock drill, a
driving connection between the ratchet ring and
the rotary member, a hammer piston, and means
interlocked with the hammer piston to impart
rotary movement to the ratchet ring and thus to
the rotary member during a stroke of the ham- '
mer piston.
5. In a rock drilling mechanism, the combina
tion of a rock drill and a guide therefor, feeding
rock to the limit of its extent and to accomplish mechanism for the rock drill comprising a sta
which necessarily requires that the rock drill tionary member and a rotary member in thread
move to the forward extremity of the shell. In ed engagement with the rotary member, a ratchet 45
order, therefore, to return the rock drill to its
45 initial position the plate 58 is rotated, by means ring rotatable in the rock drill and being opera
tively connected with the rotary member to ro
of the lever 63, to a position in which the wings tate said rotary member, a hammer piston,
59 tilt the pawls 56 out of the path of the teeth means for selectively controlling the direction
54 and release the pawl 51 to enable the latter of rotation of the ratchet ring, and means inter 50
to move into position for engaging the ratchet locked with the hammer piston to impart rotary
movement to the ratchet ring during a portion
During the subsequent reciprocations of the of the rearward stroke of the hammer piston.
hammer piston 21 the jars applied to the rock
6. In a rock drilling mechanism, the combina
drill upon reversal of the piston at the end of tion of a rock drill and a guide therefor, feeding 55
its rearward stroke cause the feed nut 69 to- ro
mechanism for the rock drill comprising‘ a sta
tate freely on the feed screw 13 and the rock
drill will be moved rearwardly towards its initial tionary member and a rotary member in thread- '
ed. engagement with the stationary member, a
position and constitute the sole force for retract
piston reciprocable in the rock drill and 60
ing the rock drill. The ratchet ring 52 will then
also be free to rotate within the back head to impartingjars thereto tending to move the rock
60 permit of this movement of the feed nut but ' drill along the support, a ratchet ring rotatable
will be held against movement in the opposite in the rock drill and being operatively connected ‘
tothe rotary member to rotatesaid rotary mem
direction by the pawl 51 which will be in engage
ment with or in position to engage a tooth 54.
ber, means interlocked tosaid piston to cause 65
‘Thus, when the piston 21 reverses in the front said piston to move along a spiral path and to
65 end of the piston chamber 25 the jar applied to
impart rotary movement to the ratchet ring, and
the rock drill and tending to move it forwardly means selectively engageable with the ratchet
will be rendered ineffective by the pawl 51. Upon ring .to render the jars of the hammer piston’
40 until the working implement has penetrated the
continued operation of the hammer piston 21
the rock drill will be gradually moved rearwardly
to the starting position.
I claim:
1. In a rock drilling mechanism, the combina
non-effective to move the rock drill relatively
to the support.
2,124,627.—W'illiam A. Morrison, Easton, Pa. ROCK DRILL MECHANISM. Patent
dated July 26, 1938. Disclaimer ?led September 22, 1939, by the assignee,
IngersolZ-Rand Company.
Hereby enters this disclaimer to claim 2 in said speci?cation.
[O?icial Gazette October 10, 1939.]
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