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Патент USA US2107238

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Feb. 1, 1938.
H_ |-|_ DES RocHEs
ROCK DRILL JOINT
Filed July 12, 1937
2,107,238
Patented Feb. 1, 1938
2,107,238
UNITED STATS ATENT ()FFECE
2,197,238
ROCK DRILL JQINT
Hilton H. Des Roches, Butte, Mont.
Application July 12, 1937, Serial No. 153,234
6 Claims.
U
This invention relates to rock drills and par
ticularly to a form of joint or connection for
detachably securing the ‘bit to the shank of the
drill. The object of the invention is to provide a
joint or connection by which the bit is ?rmly and
tightly secured to the shank, but which also per
mits ready detachment of the bit to allow re
placement or sharpening of the same. A further
object is to obviate the use of pins or springs
for holding the bit on the shank, as such ar
rangements are open to considerable objection.
The advantages of the invention will further ap
pear from the following speci?cation in connec
tion with the accompanying drawing, in which
(01. 255-63)
.
l v
shank l5 cannot be completely separated'by
movement in a direction parallel to the axis of
the shank. However, limited movement or sepa
ration of the bit and shank is permitted, as
shown in Figure 2, by the fact that the portion is
I‘! of the recess It in the shank is somewhat
larger than the head It on the tongue 52. When
the bit is thus partly separated from the shank,
it- can be moved laterally relative to the shank,
and the two parts may thus be separated from
each other.
'
bit and shank taken at right angles to Figure 1;
Figure 4 is an enlarged perspective view of the
end of the shank;
Figure 5 is an enlarged perspective view of the
The upper surfaces on the bit and the lower
col-operating surfaces on the shank are prefer
ably made so as to' prevent lateral movement be
tween the bit and shank when said surfaces are 71'5
in contact. To this end the shank is provided
with lower surfaces 20 on each side of the slot
l6. Each surface 20 inclines upwardly to- a slight
extent from the outer edge thereof toward said
slot. Also each surface inclines upwardly from 20
each end toward the center of the shank indi
catedat C. On each side of the slot IS a flat sur
face2| is also preferably formed.
The bit’ ill is provided with surfaces which are
end of the bit which engages the end of the
complementary to and which are adapted to, ?t
Figure l is a side view of a combined bit and
shank involving the invention with the parts in
operative position;
Figure 2 is a view similar to Figure 1 with the
bit slightly separated from the shank;
Figure 3 is also a side view of the combined
shank; and
Figure 6 is an enlarged cross-section showing
the relation of certain parts on the shank and
bit.
As shown in the drawing, the bit II] is prefer
ably made generally rectangular in cross-section,
and the working surface thereof is provided with
pyramidal projections‘ as in my prior Patent No.
1,561,975, although the present invention is not
3 limited to such features. The bit 10 is provided
on one end, conveniently referred to herein as
the upper end, with an upwardly projecting look
ing tongue l2 which extends the full width of
the bit as shown in the drawing. At its upper
end the tongue l2 isv provided with an enlarged
generally cylindrical portion or head l3, and the
tongue itself is made slightly Wedge-‘shaped, be
ing somewhat thicker at the point l4 adjacent
the body of the bit than it is adjacent the head
l3.
The shank I5 is provided at its end adjacent
the bit, conveniently referred to as the lower end,
with a slot or recess it which is adapted to re
ceive the tongue I2 of the bit. This recess com
50 prises an enlarged portion ll and a somewhat
narrow or constricted throat i8 which is adapted
to tightly ?t and receive the thicker portion is
of the wedge-shaped tongue l2 on the bit. The
enlarged head l3 on the tongue I2 is somewhat
Oi Oi larger than the throat 18 so that the‘ bit l0 and
against the above described surfaces on the
shank when the two, parts are assembled. Thus,
on each side of the tongue [2 the bit is formed
with inclined surfaces 22 and flat surfaces 23
which are complementary respectively to and ?t 30
against the surfaces 2!] and 2| on the shank.
The result is that when the bit If! is forced
tightly against the shank, the complementary
surfaces 20 and 22 closely engage each other and
prevent any lateral movement of the bit relative 35
to the shank in any direction.
In assembling the parts the bit is moved later
ally of the shank with the enlarged head l3 of
the tongue engaging the enlarged portion H of
the recess Hi.
When the surfaces 28 and 22 are
in alignment, the tongue 12 is then forced into
the recess it until the tongue wedges tightly in
the narrow throat ll! of the recess or slot, and at
the same time the cooperating surfaces 20, 22
on the shank and bit are brought into engage
ment and serve to accurately center the bit on
the shank and‘ prevent any lateral movement of
one part relative to the other.
In operation the small space‘ 24 in the slot l6
above the head I3 is soon ?lled and tightly
packed with chips or cuttings which further serve
to hold the bit in place on the shank. To dis
connect the parts, it is a simple matter to remove
any chips or dirt from the space 24, and then a .
slight blow on the bit loosens its wedged engage
2,107,238
2
ment with the shank, after which the bit can be
separated slightly from the shank and then
moved laterally to disengage the tongue thereof
from the slot in the shank.
Having thus described the invention, what is
claimed as new and desired to be secured by Let
ters Patent is:
'
V
V
1. In a rock drill, a shank having a slot extend
ing transversely across the end thereof, a bit hav
10 ing a tongue adapted to enter said slot by lateral
movement of the bit relative to the shank, means
to prevent separation of the bit from the shank
by movement of the bit axially of the shank, said
slot having a constricted throat and said tongue
15 having a wedge shaped portion adapted to tightly
wedge in said slot when the bit is forced axially
toward the shank, and cooperating means on the
shank and bit to prevent lateral movement of the
bit relative to the shank when said tongue is
20 forced into said throat.
2. In a rock drill, a shank having a slot‘ extend—'
ing transversely across the end thereof, a bit hav
ing a tongue adapted to enter said slot by lateral
movement of the bit relative to the shank, means
25 to prevent separation of the bit from the shank
by movement of the bit axially of the shank, said
slot having a constricted throat and said tongue
having a wedge shaped portion adapted to tightly
wedge in said slot when the bit is forced axially
30 toward the shank, said bit and shank having co
operating surfaces adapted to engage and prevent
lateral movement of the bit relative to the shank
‘when the bit is forced axially of the shank and
said tongue is wedged in said throat.
35
.
V
3. In a rock drill, means for detachably secur
ing a bit to a shank, comprising a slot in one of
said parts and a tongue on the other part adapted
to enter said slot when one part is moved laterally
relative to the other part, said slot having a con
40 stricted throat and said tongue having a wedge
shaped portion adapted to tightly engage in said
throat when the bit and shank are forced axially
toward each other, said bit and shank having co
operating parts arranged to engage and prevent
lateral movement of the bit relative. to the shank
When said tongue is forced into said throat.
‘i, In a rock drill, means for detachably secur
ing a bit to a shank, comprising a slot in one of
said parts and a tongue on the other part adapted
to enter said slot when one part is moved laterally
relative to the other part, said slot having a con
stricted throat and said tongue having a wedge C21
shaped portion adapted to tightly engage in said
throat when the bit and shank are forced axially
toward each other, said bit and shank having co
operating complementary surfaces thereon in
clined relative to the axis of the shank and ar 10
ranged to engage when said tongue is forced into
said throat, whereby lateral movement of the bit
relative to the shank is prevented.
5. In a rock drill, a shank having a slot extend
ing across the end thereof, said slot having a con
stricted throat and an enlarged portion back of
said throat, a bit having a tongue on one end
thereof, said tongue having an enlargement on
the outer part thereof, said tongue being con
structed to enter said slot by lateral movement
of the bit relative to the shank, said enlargement
on the tongue being of such size as to prevent
withdrawal of said tongue from said slot in a
direction axially of the shank, said tongue also
having a wedge-shaped portion thereon which is
adapted to tightly wedge in said throat when said
bit is forced axially toward said shank, said bit
and said shank having cooperating surfaces there
on arranged to engage and prevent lateral move
ment of the bit relative to the shank when said
tongue is forced into said throat.
30
6. In a rock drill, a bit and a shank, one of said
parts having a slot provided with a constricted
portion and the other having a tongue constructed
to wedge in said constricted portion of the slot . 35
by axial movement of the bit
shank, and cooperating surfaces
shank arranged to engage and
movement of the bit relative to
relative to the
on the bit and
prevent lateral
the shank ina
direction parallel to said tongue or slot when said
tongue is forced into the constricted portion of
said slot, said tongue having an enlargement
thereon to prevent withdrawal of the tongue from
the slot in a direction parallel to the axis of the
shank.
'
HILTON H. DES ROC‘HES.
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