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Патент USA US2114047

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April 12, 1938.- 9
‘
J. c. CURTIS
2,114,047 '
DRILL STEEL RETAINER
Filed March 15, 1956
2 Sheets-Sheet 1
JOHN c.~ 60277.5
INVENTOR
BY
'
ATTORNEY
April 12, 1938.
J, ¢_ CUR-n3
2,114,047
DRILL STEEL RETAINER
‘Filed March 13, ‘1936
I
2 SheetsmSheet 2
<<<</</</////;,
JOHN C. CURTIS
INVENTOR
BY
I
‘ATTORNEY
2,114,047
Patented Apr. 12, 1938
UNITEDY‘STATES PATENT OFFICE
DRILL STEEL RETAINER
‘John 0. Curtis, Gar?eld Heights, Ohio, assignor
to The Cleveland Rock Drill Company, Cleve
land, Ohio, a corporation of Ohio
Application March 13, 1936, Serial No. 68.744
11 Claims. (CI. 121-e2)
This invention relates broadly to ‘rock drills of
the percussive type,_ but moreparticularly to im
provements in drill steel retainer therefor. .
One object of this invention is to produce a
5 releasable drill steel retainer of simple construc
tion which is strong, durable and ef?cient.
Another object of this invention is to produce
a tool retainer with resilient means acting on
the retainer for looking it in operative or inoper
10 ative position, and simultaneously absorbing the
shocks or blows of the drill steel against the re
tainer.
Other objects of this invention will be apparent
from the following detailed description wherein
15 similar characters of reference designate corre
sponding parts and wherein: -
-
Fig. 1 is a side elevational View of the front
portion of a rock drill illustrating the improved
retainer in operative position.
20
Fig. 2 is a view similar to Fig. 1 illustrating the
end of the shaft or bolt 20 is formed with a head
2! shaped for interlocking engagement with » a
shoulder 22 provided on the adjacent arm of the
yoke, thus preventing the rotation of the bolt 20
relative to the yoke II. The otherend of the bolt
20 is formed with a reduced screw threaded por
tion adapted to receive a nut 23 engageable with
the adjacent arm I8 of the yoke II, which arm
may thereby be clamped between the nut 23 and
an annular shoulder 24 formed on the shaft 20 10
at the end of its reduced portion.
‘I
Interposed between the shaft 20 and the rubber
buffer I6, there is slidable in the‘ oblong ‘opening .
I5, but locked therein against rotation, a substan
tially rectangular member or block 25. This 15
block has its end portions protruding from the
side walls of the boss I4 to form movable lugs 26
having the upperwall 21 thereof machined per
fectly ?at, and forming at the inner end of each
lug a shoulder 28 engageable with the side arms
I8 to prevent the accidental removal in a length
Fig. 3 is a longitudinal sectional view'taken in wise direction of the block 25. from the aperture
I5. The under side of the block 25 is recessed to
a plane indicated by line 3—3 in Fig. l and look
ing in the direction of the arrows shown therein. form an arcuated seat 29 for the rubber buffer
I6, and two sidewallsor shoulders 34 engaging
Figs. 4 and 5 are views similar to Figs. 1 and 2
25
the end walls of the buffer I6 for preventing the
respectively, illustrating a modi?cation of the in
' lengthwise movement of the buffer.
vention.
The free end of the arms I8 are provided with
. Fig. 6 is a View similar to Fig. 3, but taken in a
two
diverging inclined surfaces 30 and ‘3| engage
‘plane indicated by line 6-—6 in Fig. 4.
>
Referring to the drawings, It! ‘represents the able with the upper wall 21 of the lugs 26, and
30
frontend housing of a rock drill having the shank causing thereby vthe compression of the rubber
II. of a drill steel I2 slidable therein. This drill buffer I6.
In the modi?cation shown in Figs. 4 to 6 inclu
steel has a collar I3 formed integral thereon, and
engageable with the front end of the housing ID sive, the shaft 26] has beenmade an integral part
32 of the arms I8. To permit the‘ assembly of this
35 to limit the penetration of the shank II within
the former. The front end of the housing II is modi?ed construction, the side wall of the front
housing boss “I has beencut open as at 33, thus
substantiaily cylindrical except for a boss or en
largement I4 formed on one, side thereof. This allowing the integral shaft portion 32 of the re‘
boss has an opening I5 of oblong shape formed tainer, to be introduced in the. oblong aperture I5,
after the‘ insertion of the rubber bu?er I6 and
therethrough and adapted to accommodate with
block 25.
'
‘
in the bottom part thereof a substantially cylin
After the device has been assembled, it will be
‘ drical rubber buffer I6, which iscentrally aper
noted that the‘ block 25 engaging the rubber
tured as at I6’ to permit its compression.
In order to prevent the accidental'removal of buffer I 6 will cause a relatively slight compression
45 the drill steel I2 from the fronthousing, there is of the latter due to the engagement of the inclined
a yoke Il partly encircling the drill steel ahead surfaces 30 or 3I with the upper wall 21 of the lugs
of its collar I3, and capable of engagement with 26. It will also be observed that when the retainer
the latter. This yoke has two parallel‘ arms I8 is ‘positioned as shown in Figs. 1 and 4, that is in
extending upwardly therefrom to the boss I4 of operative position, the blows transmitted by the
the housing I6. The free end of the arms I8 are collar II of the drill steel I2 to the yoke II, will be
absorbed or at least greatly cushioned by the
enlarged on one side as at I6, and transversally
rubber buffer I6.
apertured to receive a shaft or bolt 20 which ex
In addition to the cushioning action of the
tends through the apertured boss I4. The end
portions of this shaft engages the side arms of rubber buffer I 6, the latter causes the forcible
engagement of the upper wall 21 of the lugs 26
55 the yoke II to serve as a pivot for the latter. One
retainer in inoperative position.
25
35
50
65
2
2,114,047
with either diverging surfaces 30 and 3| of the
arms 18, thus maintaining the yoke IT in either
operative or inoperative position.
When it is desired to remove the drill steel
from the housing Ill, the yoke I‘! may be rocked
from the position shown in Fig. 1 to the position
from said yoke, an element extending through
shown in Fig. 2.
said aperture and engaging said side arms to
In this instance, the point of
convergence of the surfaces 30 and 3| passing
over the lugs 26, will cause a greater compres
sion of the rubber buffer I6. When ?nally the
surfaces 3| engage the lugs 26 as shown in Figs. 2
and 5, the retainer will again be locked against
accidental movement.
By means of this construction, the blows im
15 parted to the yoke I‘! by the collar of the drill.
steel [1, will tend to drive the retainer away from -
a boss on one side of said housing having an
aperture extending therethrough, a yoke for re
taining the drill steel in said housing movable
into operative or inoperative position relative to
said drill steel, side arms extending upwardly
serve as a pivot for said yoke, a member extend
ing through said aperture and engaging said side
arms to carry said yoke and lock the same in 10
position, and a rubber buffer in said aperture
acting on said member to cushion the yoke and
to press said member into interlocking engage
ment with said side arms.
5. A ‘retainer for a rock drill comprising in
combination with a housing and a drill steel, a
the housing I0, and thereby increasing the fric- _
boss on one side of said housing having an aper
tional engagement of the surfaces 30 with the
ture extending therethrough, a yoke for retain
ing the drill steel in said housing movable into
operative or inoperative position relative to said 20
drill steel, side arms extending upwardly from
said yoke, means within said aperture engaging
lugs 21 to positively prevent the rockingmove
ment of the retainer into inoperative position.
Although the foregoing description is neces
sarily of a detailed character, in order to com
pletely set forth the invention, it is to be under
stood that the speci?c terminology is not in
tended to be restrictive or con?ning and it is to
be further understood that various rearrange
ments of parts and modi?cation of structural
detail may be resorted to without departing from
the scope or spirit of the invention as herein
30 claimed.
I claim:
1. A retainer for a rock drill comprising in
said side arms to serve as a pivot for the yoke,
movable lugs carried by said housing engaging
said side arms for suspending said yoke thereon '
and for locking the same in position, and resilient
means within said aperture acting on said lugs
to cushion said yoke and press said lugs into
interlocking engagement with said side arms.
6. A retainer for a rock drill'comprising in 30
combination with a housing and a drill steel, an
combination with a housing and a drill steel, a
enlargement on one side of said housing having
an aperture extending therethrough, an element
boss-on one side of said housing having anaper
ture extending therethrough, a yoke for retaining
the drill steel in said housing movable into opera
tive or inoperative position relative to said drill
steel, side arms extending upwardly from said
yoke, an element extending through, said aperture
lugs formed thereon, a rubber buifer within ‘said 7"‘
aperture supporting‘ said element, a yoke for re—
taining the drill steel in said housing, side arms
carried by said side arms to serve as a pivot for
said yoke, and a resiliently supported member
within said aperture having end portions engag
ing said side arms to carry the yoke in operative
or inoperative position relative to the drill steel.
2. A retainer for a rock drill comprising in
combination with a housing and a drill steel, a
boss on one side of said housing having an aper
ture extending therethrough, a yoke for retaining
the drill steel in said housing movable into op
extending through said aperture and having
extending upwardly from said yoke and having
flat surfaces resting on the lugs of said element,
and means within said aperture engaging said
side arms above said element for preventing the
upward movement of said side arms and thereby
causing the forcible interlocking engagement of
the lugs of said element with the flat surfaces 'of
said side arms by compressing said rubber buffer.
'7. A retainer for a rock drill comp-rising in
combination with a housing and a drill steel, an
enlargement on one side of said housing having
an aperture extending therethrough, an element
50 erative or inoperative position relative to‘ said
extending through said aperture and having
drill steel, side arms extending upwardly from
said yoke, a shaft like element extending
through said aperture and engaging said side
lugs formed thereon, a rubber buffer within said
aperture supporting said element, a yoke for re
taining the drill steel in said housing, side arms
arms to serve as a pivot for said yoke, and re
extending upwardly from said yoke and having
siliently supported means within said aperture
having end portions protruding therefrom and
engaging said side arms for carrying the yoke
independently of said shaft like element.
?at surfaces resting on the lugs of said element,
3. A retainer for a rock drill comprising in
60 combination with a housing and a drill steel, a
boss on one side of said housing having an aper
ture extending therethrough, a yoke for retain
ing the drill steel in said housing movable into
operative or inoperative position relative to said
drill steel, side arms extending upwardly from
said yoke, an element through said aperture en
gaging said side arms to serve as a pivot for said
yoke, a member resiliently supported within said
aperture and having end portions protruding
therefrom in carrying engagement with said side
arms, and means on said end portions and side
arms capable of interengagement for locking said
yoke in operative position.
4. A retainer for a rock drill comprising in
combination with a housing and a drill steel,
and means carried by said side arms engaging
said housing above, said element to limit the up
ward movement of said side arms and to com
press said rubber buifer for e?ecting the forcible
interengagement of the ?at surfaces of said side 60
arms with the lugs of said element.
8. A retainer for a rock drill comprising in
combination with a housing and a drill steel, an
enlargement on one side of said housing having
an aperture extending therethrough, a yoke for
retaining the drill steel in said housing, side arms
extending upwardly from said yoke, a shaft like
element extending through said aperture and en
gaging said side arms to serve as a pivot for said
yoke, a substantially rectangular block extending
through said aperture having its ends protrud
ing therefrom, diverging ?at surfaces on said
side arms capable of interlocking engagement
with the protruding end of said block for holding
said yoke in position, and resilient means within 76
2,114,047
said aperture supporting said block and acting
‘ ‘thereon for forcibly effecting the interlocking en
gagement aforesaid.
9. A retainer for a rock drill comprising in
combination with a housing and a drill steel, an
enlargement on one side of said housing having
an aperture extending'therethrough, a substan
tially'rectangular block within said aperture hav
ing its ends protruding therefrom, a yoke for re
taining the drill steel in said housing, side arms
10 extending upwardly from said yoke, a pivotal
connection between said side arms and housing,
said side arms resting on the protruding ends of
said block for supporting said yoke, diverging ?at
surfaces on said arms capable of interlocking
engagement with the protruding .ends of said
block for holding said yoke in position, and a
rubber buffer within said aperture supporting said
block and acting thereon for forcibly effecting
the interlocking engagement aforesaid.
10. A retainer for a rock drill comprising in
‘ combination with a housing and a drill steel, a
boss on one side of said housing having an‘ aper
ture extending therethrough, a yoke for retain
ing the drill steel in said housing, side arms ex
25 tending upwardly from said yoke, a pivotal con
3
nection between said side arms and housing, a
rubber buffer within said aperture, an element
extending through said aperture supported by
said rubber buffer, said element having end por
tions in carrying engagement with the side arms
of said yoke, means for locking said element
against lengthwise movement, and means de
pending from the end portions of said element
engageable with the end walls of said rubber
buffer for preventing the lengthwise movement of 10
said buffer.
11. A retainer for a rock drill comprising in
combination with a housing and a drill steel, a.
transversally disposed aperture on one side of
said housing, a yoke for retaining the drill steel
in said housing, side arms extending upwardly
from said yoke, means carried by said housing
engaging said side arms to serve as a pivot for
said yoke, an element extending through said
aperture in carrying engagement with said side
arms, a resilient buffer within said aperture
supporting said element, and means on said ele
ment engaging said side arms and said buffer
for preventing the lengthwise movement of said
element and buffer relative to said housing.
JOHN C. CURTIS.
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