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Патент USA US2057188

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Oct. 13, 1936.
2,057,188
' E. G. GARTIN
I ROCK DRILL
Filed Nov. 15, 1935
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Patented Oct. 13, 1936
2,057,188.
UNITED STATES PATENT OFFICE
2,057,188
ROCK DRILL
Elmer G. Gartin, Claremont, N. H., assignor to
Sullivan Machinery Company, a corporation of
Massachusetts
Application November 15, 1935, Serial No. 49,989
11 Claims. (Cl. 121-10)
This invention relates to rock drills, and more portion of the cylinder is formed with an en
particularly to improvements in a hole blowing larged bore 8 alined with the cylinder bore 2, and.
means for a hammer rock drill of the pressure
arranged in the bore 8 is a cylindrical rear head
?uid actuated type.
9 and a head member ill, the latter abutting the
5
An object of this invention is to provide an head 9 and cooperating therewith to form a
improved rock drill hole blowing means. Another valve chest. Also arranged in the bore 8 and
object is to provide in a rock drill of the pressure abutting the member I0 is a ratchet ring I I, and a
?uid actuated hammer piston type, improved hole rear plate l2. The parts 9, III, II and I2 are
blowing means associated with the ?uid dis
held in position within the bore 8 by a rear head
tributing valve mechanism and hammer piston. block [3 suitably attached to the rear end of the 10
Still another object is to provide an improved cylinder. The buffer ring ‘I is secured within the
hole blowing means for effecting a hole blowing forward end of the cylinder bore by a front chuck
function, embodying means for supplying pres~ housing I4 suitably attached to the front end of
the cylinder, and rotatably mounted in the chuck
housing is a chuck sleeve l5 [carrying a chuck 15
hammer piston for holding the distributing valve bushing I6 in which is mounted the shank i‘! of
stationary and to- balance the hammer piston a usual hollow rock drill steel. Arranged within
in substantially exhaust closing position within the ratchet ring H is a pawl carrier N3 of a con
sure fluid to a pressure area on the ?uid distribut
15 ing valve and the opposite pressure areas on the
its cylinder so that a hole blowing function is
20 effected in an improved manner. A still further
object is to provide an improved rock drill where
in a tappet or striking block is employed for trans
mitting the. impact blows of the hammer piston
to the drill steel, and having improved passage
‘,5 means in the tappet and steel chuck whereby the
flow of hole blowing pressure is conducted to the
drll steel bore in an improved manner.
Yet an
other object is to provide an improved rock drill
hole blowing means controlled by the throttle
3 O valve of .the drill hammer motor. These and
other objects will, however, hereinafter more fully
appear.
.
, In the accompanying drawing there is shown
for purposes of illustration one form which the
35 invention may assume in practice.
In this drawing,—
Fig. 1 is a view in longitudinal section through
a hammer rock drill in which the illustrative form
of the improved hole blowing means is embodied.
Fig. 2 is a fragmentary .sectional view taken
40
in the plane of Fig. 1, showingthe moving parts
in a different position.
.
3-3 of Fig. 1.
‘
Fig. 4 is a cross sectional view taken on line
4-4- of Fig. 1.
connected to spiral lugs of a usual ri?e nut se
cured within the rear end. of the hammer piston.
The piston striking bar 5 is formed with straight
longitudinal grooves 2| engageable with straight 25
lugs formed on a chuck nut 22 secured within the
rotatable chuck sleeve I5. As the hammer piston
3 reciprocates within the cylinder bore, it is ro
tated by the ri?e bar IQ of the ratchet and pawl
mechanism in a well known manner and the ro 30
tative movement of the hammer piston is trans
mitted through the straight grooves on the piston
striking bar and the chuck sleeve to the drill
steel. Guided for reciprocatory movement in the
chuck sleeve is a tappet or striking block- 23 hav
ing an enlarged head ?tting the chuck sleeve bore
24 and a reduced body portion ?tting the reduced
chuck sleeve bore 25. This tappet is adapted to
transmit the impact blows of the hammer piston
to the drill steel shank. The drill steel is formed 40
with a central longitudinal bore 26 extending
therethrough for conducting cleansing ?uid to
V
Fig. 3 is a cross sectional view taken online
45
ventional design, carrying pawls engaging the
teeth of the ratchet ring and having a forwardly
projecting ri?e bar l9 formed with spiral grooves
'
Fig. 5 is a side elevational view of the tappet.
In this illustrative construction there is shown
a hammer rock drill of the pressure ?uid actu
50 ated type comprising a cylinder I having a bore 2
containing a reciprocable hammer piston 3. The
hammer piston has a piston head ?tting the
cylinder bore and a forwardly projecting striking
bar 5 of reduced diameter guided in a bore 6
55 formed in a front buffer ring ‘I, The rearward
the cutting end of the drill steel to blow out
the cuttings from the drill hole. Secured within
the rear head block I3 is a gland plug 2'! through 45
which cleansing liquid is conducted to a tube 28
extending centrally through axial bores in the
ri?e bar, hammer piston and tappet within the
drill steel bore, the cleansing liquid ?owing
through the tube 28 into the drill steel bore. As
the hammer piston reciprocates, pressure ?uid is
conducted from the forward end of the cylinder
bore through the grooves in the piston striking
bar and improved passage means, to be later de
scribed, in the tappetand chuck sleeve to the 55
2
2,057,188
drill steel bore, the cleansing liquid mingling with
the pressure ?uid as it ?ows through the steel bore
to the bottom of the drill hole.
The ?uid distribution means for supplying
pressure ?uid to and exhausting ?uid from the
motor cylinder is of a conventional design and
comprises a valve chamber 32 formed in the head
member 9 and containing a reciprocable auto—
matic ?uid distributing valve 33 herein of the
cylinder, compressing the same to a relatively
high pressure, and this compression pressure
acts on the forward area of the valve to throw
the latter rearwardly from the position shown.
When the valve is in its rearward position, pres
sure ?uid may flow from the throttle valve
through port 45, passage 41, groove 42, passage
4|, groove 40 and through the axial bore 39 to
the rear end of the cylinder bore, the pressure
sleeve type guided for reciprocatory movement on
a cylindrical guide portion 34 formed integral
?uid acting on the rear pressure area of the pis
with the head member ID and projecting within
the valve chamber. The sleeve valve is formed
working stroke, 1. e. to deliver an impact blow
to the shank of the drill steel. Upon initiation
with an enlarged circular ?ange 35 ?tting the
15 bore 36 of the valve chamber and having a rear
of the forward piston movement the forward end
pressure area 31, and a sleeve-like body portion
38 adapted to ?t a bore 39 connecting the valve
chamber bore with the rear end of the motor cyl
inder bore. Formed in the wall of the valve
chamber is an annular ?uid supply groove 40 to
which pressure ?uid is supplied through a pas
sage, 4| communicating with an annular pres
sure chamber 42 formed in the rear head block.
Arranged in a bore 43 in the head block is a
ton to drive the latter forwardly to effect its
of the cylinder bore is connected to exhaust 15
through the exhaust passage 48 and the passage
52 communicating with the exhaust passage 59.
As the hammer piston moves forwardly, com
munication of the exhaust passage 48 with the
forward endof the cylinder bore is cut off by 20
the piston head, while the passage 49 is overrun
by the rear edge of the piston, thereby admitting
pressure ?uid from the rear end of the cylinder
bore through passage 49 to the rear end of the
25 throttle valve 44 having a port 45 for conducting
valve chamber to act on the rear pressure area 25
pressure ?uid from a central supply passage 46
in the valveto a passage 41 communicating with
the pressure chamber 42. This cylinder is pro
vided with a usual piston controlled central ex
30 haust passage 48, and a valve throwing passage
31 of the valve to throw the valve forwardly to
the position shown. Upon continued forward
movement of the piston, the rear edge of the
hammer piston overruns the exhaust passage 48
thereby to connect the rear end of the cylinder 30
bore to exhaust.
When it is desired to effect a hole blowing
operation, the throttle valve 44 is turned into the
position shown in Fig. 1 with the port 53 com
municating with the passage 41, and pressure
?uid may then ?ow through groove 54 and pas
sage 55 to the rear end of the valve chamber
49 communicates with the cylinder bore between
the rear end of the bore and the exhaust passage
48, and this passage is piston controlled and com
municates with the valve chamber at the rear,
35 side of the valve for supplying throwing pressure
to the rear pressure area 31 of the valve. An
exhaust passage 50 connects the rear end of the
valve chamber to exhaust. Formed in' the
valve chamber between the exhaust passage 50
and the supply groove 4|] is a groove 5| connected
by a passage 52 to the forward end of the cylinder
bore.
Now referring to the improved hole'blowing
, means associated with the ?uid distribution
means, it will be noted that formed in the throttle
valve 44 is a port 53 having a communicating cir
cumferential groove 54, and this groove is adapt
ed to supply pressure ?uid through a passage 55
to the valve chamber at the rear side of the valve
150 33. The improved passage means in the tappet
and chuck sleeve for conducting pressure ?uid
to act on the rear, pressure area 31 of the valve
to hold the valve in its forward position shown in
Fig. 1. Pressure ?uid at the same time ?ows due 40
to leakage, from the supply groove 40 through the
bore 39 past the valve to the rear end of the cyl
inder bore. Simultaneously,_pressure ?uid ?ows
from the supply groove 40 past the valve through
groove 5| and passage 52 to the forward end of 45
the cylinder bore, the pressure ?uid acting on the
forward pressure area of the piston to move the
piston rearwardly against the opposing pres
sure leaking past the distributing valve through
the bore 39, the hammer piston moving rear
wardly until the forward edge of the piston head
past the tappet to the drill steel bore comprises
passages 56 formed on the sides of the reduced
portion of the tappet and cooperating longitudi
sage 48, the pressure within the forward end of
the cylinder bore then being substantially re
55 nal passages 51 cut in the walls of the chuck sleeve
duced by the slight leakage through the exhaust
bore.
The operation of the rock drill motor will be
passage and the ?uid ?owing through the grooves
2| on the piston striking bar so that the piston
is held in a substantially balanced position sub
clearly apparent from the description given.
slightly overruns or “cracks” the exhaust pas
When the parts are in the position shown in
Fig. 1 and the valve, 4415 turned into a position
to bring the port 45 into communication with
stantially midway between the ends of the cyl
the passage 41, pressure ?uid may ?ow from
sure ?uid acting on the rear pressure area 31 in
the throttle valve through port 45, passage 41,
chamber 42, passage 4|, groove 40, through the
65 valve chamber past the valve, groove 5| and
passage 52 to the front end of the cylinder bore,
the pressure ?uid acting on the forward pressure
area of the hammer piston to drive the piston
rearwardly to effect its return stroke. Upon in
70 itiation of the rearward piston movement, the
rear end of the cylinder bore is connected to
exhaust through the exhaust passage 48, and as
the piston moves rearwardly, the piston head
overruns the exhaust passage 48, thereby trap
76 ping the pressure fluid within the rear end of the
inder. It will thus be seen that the ?uid dis
tributing valve 33 is at this time held by pres
its forward position as shown in Fig. 1 so that
pressure ?uid ?ows continuously to the forward
end of the cylinder bore and the hammer piston 65
is maintained in a balanced substantially ex
haust closing position within the cylinder bore,
the piston being held in such position by the
pressure acting on the opposed pressure areas of
the piston head, thereby maintaining the exhaust 70
passage substantially closed. Pressure ?uid at
this time continuously ?ows from the forward
end of the cylinder bore through the rotation
grooves 2|, past the tappet, through the pas 75
2,057,188
sages 55, 51 and through the chuck sleeve bore
to the bore 26 in the drill steel to blow out the
cuttings from the drill hole. During the hole
blowing operation, the drilling motor may be fed
or moved rearwardly to bring the tappet away
from the drill steel shank, as shown in Fig. 1, so
that the pressure ?uid may ?ow freely past the
forward face of the tappet to the drill steel bore.
When it is desired to shut down the motor, the
10 throttle valve 44 is turned into its neutral posi
tion with the passage 4‘! cut off by the wall of
the throttle valve. During normal running of
the drilling motor, the tappet assumes the posi
tion shown in Fig. 2 during the return'stroke
15 of the piston and at that time the passages 56
are cut off from the passages 51, and when the
piston striking bar imparts an impact blow to the
3
in ‘saidstationary position, to the hollow drill
steel.
2. In a rock drill, a cylinder, a hammer pis
ton reciprocable therein, a chuck for receiving
the shank of a hollow drill steel, a member rela
tive to which said piston is reciprocabe for trans
mitting the impact blows of the hammer piston
to the shank of a hollow drill steel, ?uid dis
tribution means for effecting reciprocation of said
piston having an automatic ?uid distributing
valve and a ?uid supply connection, and means
operative to effect hole blowing while ?uid supply
to said distributing valve takes place, and in
cluding at least a portion of said valve, for ef
fecting a supply of pressure ?uid from said sup 15
ply connection to opposed pressure areas on said
hammer piston, to maintain said piston‘ in a
tappet, it is driven forwardly to the position
relatively stationary position substantially mid
shown in Fig. l to bring the passages 56 into
way between the ends of said cylinder, and pas
20 communication with the passages 57 so that a
blast of pressure ?uid is conducted past the
tappet to the drill steel bore at that time .
As a result of this invention, it will be noted
that an improved hole blowing means is provided
for a rock drilling motor whereby the ?uid dis
tributing valve and hammer piston are main
tained in a hole blowing position in an improved
and simpli?ed manner. It will further be noted
that an improved hole blowing means is provided
wherein the hammer piston is maintained dur
ing the hole blowing operation in a substantially
balanced position midway between the ends of
the cylinder bore to cut off substantially com
munication of the central cylinder exhaust pas
35 sage with the forward end of the cylinder so that
a continuous ?ow of pressure ?uid is effected
from the forward end of the cylinder bore
through the bore in the drill steel to the bottom
of the drill hole to blow out the latter. It will
further be evident that by the provision of the
improved tappet and chuck structure, it is pos
sibe to obtain a free ?ow of cleansing ?uid past
the tappet to the drill steel. These and other
uses and advantages of the improved hole blow
45 ing means will be clearly apparent to those skille
in the art.
-
While I have in this application speci?cally
described one form which the invention may as
sume in practice, it will be understood that this
form of the same is shown for purposes of illus
tration and that the invention may be modified
and embodied in various other forms without de
parting from its spirit or the scope of the ap
sage means including passages on said blow 20
transmitting member and in said chuck for con
ducting pressure ?uid from the forward end of
the cylinder bore, when said hammer piston is in
said stationary position, to the hollow drill steel.
3. In a rock drill, in combination, a cylinder, a 25
piston reciprocable therein, a member relative to
which said piston is reciprocable for transmitting
the impact blows of the piston to the shank of a
hollow drill steel, ?uid distribution means for
eifecting reciprocation of said piston, and means
operative to effect hole blowing and including at
least a portion of said ?uid distribution means
for effecting a supply of pressure ?uid directly to
the opposite ends of said cylinder to act on 0p
posed pressure areas on said piston to maintain 35
the latter in a stationary hole blowing position
substantially midway between the ends of said
cylinder, and passage means including passages
on said blow transmitting member for conduct
ing ?uid from the forward end of the cylinder 40
bore, when said piston is in said stationary hole
blowing position, to the hollow drill steel.
, 4. In a rock drill, in combination, a cylinder,
a piston reciprocable therein, a member relative
to which said piston is reciprocable for transmit 45
ting the impact blows of the piston to the shank
of a hollow drill steel, ?uid distribution means
for effecting reciprocation of said piston includ
ing a free cylinder exhaust port controlled by said
piston, and means operative to effect hole blow
ing and including at least a portion of said ?uid
distribution means for effecting a supply of pres
sure ?uid directly to the opposite ends of said
pended claims.
cylinder to act on opposed pressure areas of said
What I claim as new and desire to secure by
Letters Patent is:
piston to maintain the latter in _a substantially 55
1. In a rock drill, a cylinder, a hammer piston
reciprocable therein, a member relative to which
said piston is reciprocable for transmitting the
60 impact blows of the hammer piston to the shank
of a hollow drill steel, ?uid distribution means
for effecting reciprocation of said piston having
an automatic ?uid distributing valveand a ?uid
supply connection, and means operative to e?’ect
65 hole blowing while ?uid supply to said distribut
ing valve takes place, and including at least a
portion of said valve, for effecting a supply of
pressure ?uid from said supply connection to op
posed pressure areas on said hammer piston, to
maintain said piston in a. relatively stationary
exhaust port closing position substantially mid
way between the ends of said cylinder, and pass—
age means including passages on said blow trans
mitting member for conducting pressure ?uid
from the forward end of said cylinder, when said 60
piston is‘ in said substantially midway position,
to the hollow drill steel.
5. In a rock drill, in combination, a cylinder, a
member relative to which said piston is recipro
cable for transmitting the impact blows of the 65
piston to the shank of a hollow drill steel, ?uid
distribution means for effecting reciprocation
of said piston including an automatic ?uid dis
tributing valve, and means operative to effect
hole blowing and including at least a portion of 70
position substantially midway between the ends
said ?uid distribution means for effecting a
of said cylinder, and passage means including
passages on said blow transmitting member for
conducting pressure ?uid from the forward end
supply of pressure ?uid to a pressure area on
75 of the cylinder bore, when said hammer piston is
said valve to hold the latter stationary in one
position and to effect supply of pressure ?uid to
opposed pressure areas on said piston to main 75
4
2,057,188
tain the latter in a stationary hole blowing posi-v
tion substantially midway between the ends of
tween the ends of said cylinder, and passage
said cylinder, and passage means including a
passage on said blow transmitting member for
ting member for conducting pressure ?uid from
the forward end of said cylinder, when said pis
ton is in said substantially midway position, to the
hollow drill steel.
conducting pressure ?uid from the forward end
of said cylinder, when said piston is in said sta
tionary position, to the hollow drill steel.
6. In a rock drill, in combination, a cylinder, a
piston reciprocable therein, a member relative to
10 which said piston is reciprocable for transmitting
the impact blows of said piston to the shank of a
hollow drill steel, ?uid distribution means for ef
fecting reciprocation of said piston including an
automatic ?uid distributing valve and a cylinder
15 exhaust port controlled by said piston, and means
operative to effect hole blowing and including at
least a portion of said ?uid distribution means
for effecting a supply of pressure ?uid to a pres
sure area on said distributing valve to hold the
latter stationary in one position and to effect
a supplying of pressure ?uid to opposed pressure
areas on said piston to maintain the latter in a
substantially exhaust port closing position sub
stantially midway between the ends of said cyl
25 inder, and passage means including a passage on
said blow transmitting member for conducting
pressure ?uid from the forward end of said cyl
inder, when said piston is in said substantially
midway position, to the hollow drill steel.
'7. In a rock drill, in combination, a cylinder, a
piston reciprocable therein, a member relative to
which said piston is reciprocable for transmitting
9. In a rock drill, in combination, a cylinder, a
piston reciprocable therein, a member relative to
which said piston is reciprocable for transmitting
the impact blows of said piston to the shank of a 1O
hollow drill steel, ?uid distribution means for
effecting reciprocation of said piston including an
automatic ?uid distributing valve, a cylinder ex
haust port controlled by said piston and passages
leading to the ends of the cylinder, and means 15
operative to e?ect hole blowing including a valve
and passage means controlled by said valve for
supplying pressure ?uid to a pressure area on
said distributing valve to hold the latter station
ary in one position and to e?ect a supplying of 20
pressure ?uid to opposed pressure areas on said
piston to maintain the latter in a substantially ex
haust port closing position substantially midway
between the ends of said cylinder, and passage
means including a passage on said blow trans
25
mitting member for conducting pressure ?uid
from the forward end of said cylinder, when said
piston is in said substantially midway position, to
the hollow drill steel, one of said ?uid distributing
means passages supplying pressure ?uid to one 30
pressure area on said piston, to hold the latter in
said substantially midway position and the ?uid
the impact blows of said piston to the shank of
?owing to the opposed pressure area on the piston
a hollow drill steel, ?uid distribution means for
to hold the same in said position, by leakage past
35
said valve.
10. In a rock drill, in combination, a cylinder,
a piston reciprocable therein, a chuck for receiv
ing the shank of a hollow drill steel and providing
a chamber, a tappet for transmitting the impact
blows of the piston to the shank of said hollow
drill steel, ?uid distribution means for effecting
reciprocation of said piston including means
for supplying pressure ?uid to the forward
35 e?ecting reciprocation of said piston including an
automatic ?uid distributing valve, and means op~
erative to effect hole blowing including a valve
and passage means controlled by said valve for
supplying pressure ?uid to a pressure area on
40 said distributing valve to hold the latter stationary
in one position and to effect a supplying of pres
sure ?uid to opposed pressure areas on said piston
to maintain the latter in a stationary position
substantially midway between the ends of said
45 cylinder, and passage means including a passage
on said blow transmitting member for conducting
pressure ?uid from the forward end of said cyl
inder, when said piston is in said stationary posi
tion, to the hollow drill steel.
50
means including a passage on said blow transmit
’
8. In a rock drill, in combination, a cylinder, a
piston reciprocable therein, a member relative to
which said piston is reciprocable for transmitting
the impact blows of said piston to the shank of a
hollow drill steel, ?uid distribution means for
55 effecting reciprocation of said piston including an
end of said cylinder, a passage on the piston for
intermittently supplying pressure ?uid to the
chamber within said chuck, and a passage on
the periphery of said tappet for conducting
pressure ?uid from the chuck chamber past the
tappet to the hollow drill steel.
11. In a rock drill, in combination, a cylinder,
apiston reciprocable therein, a chuck for receiv
ing the shank of a hollow drill steel and providing
a chamber, a tappet for transmitting the impact
blows of the piston to the shank of said hollow
drill steel, ?uid distribution means for effecting 55
automatic ?uid distributing valve, a cylinder ex
reciprocation of said piston including means for
haust port controlled by said piston, and means
operative to effect hole blowing including a valve
supplying pressure ?uid to the forward end of
said cylinder, a passage on the piston for inter
and passage means controlled by said Valve for
mittently supplying pressure ?uid to the chamber
60 supplying pressure ?uid to a pressure area on said
within said chuck, and a passage on said tappet
for conducting pressure ?uid from the chuck
distributing valve to hold the latter stationary in
one position and to effect a supplying of pressure
?uid to opposed pressure areas on said piston to
maintain the latter in a substantially exhaust
port closing position substantially midway be
chamber past the tappet to the hollow drill steel,
said tappet passage being automatically opened
and closed upon reciprocation of said tappet.
ELMER G. GAR'I‘IN.
65
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