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Патент USA US2137658

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Nov. 22, 1938.
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Filed Oct. 9, 1937‘
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Patented Nov. 22, 1938
2,137,658 r
Edward F. Terry, Phillipsburg, N. J., assignor to
Ingersoll-Band Company, Jersey ,City,IN. J., a
corporation of New Jersey
Application October 9, 1937, Serial No. 168,193
1 Claim’. (Cl. 255-64)
This invention relates to drilling tools, and
more particularly to drilling tools of which the
cutting bit is formed as a separate member and
stem 28 adjacent the juncture of the stem and
the shank 2!. The front end of the reduced por
attachable to the shank serving to transmit the
5 glows of the percussive element to the cutting
tion 33 serves a similar function for a pilot 35 on 5
the forward extremity of the stem 28, and inter
One object of the invention is to assure an
mediate the pilots 34 and.35 are threads 36 to
ample supply of cleansing ?uid directly to the
cooperate with threads 31 in the reduced portion
33 of the bore 21 for securing the drill bit to, the
source of cuttings.
Another object is to assure the utilization of
shank 2i.
the full force of pressure of ‘the cleansing ?uid for
dislodgingand removing cuttings from the bottom
of the hole being drilled.
jacent the stem 28 to provide a wide path through
which the force of the blows may travel to the 15
Other objects will be in part obvious and in_ skirt 22 and thus to the cutting wings 23.
part pointed out hereinafter.
In the drawing accompanying this speci?ca
Figure 1 is an end view of a ~cutting tool con
structed in accordance ‘with the practice of 'the
invention, and '
‘Figure 2 is an elevation,
partly in. section, of
the drilling tool.
Referring more particularly to the drawing, 20
designates a drill bit and 2| a shank through
which the blows of a percussive element, such as
a rock drill of the hammer type (not shown), are
As a preferred form of construction, the rear
ward end of the skirt 22 constitutes a seating
surface 38 for a shoulder 39 on the shank 2| ad
A furtheryobject is to simplify and cheapen'the
15 construction of devices‘ of this character.
portion 32 and a reduced portion 33 of which the
former serves as a bearing for a pilot 34 on the
transmitted to the cutting bit for actuating it.
In the,form of the invention illustrated the
cutting bit comprises a body portion or skirt 22
carrying ‘a plurality of cutting wings 23 at'its
front end. Any suitable number of cutting wings
23, may be provided, four being shown in the pres
35 ent instance and arranged in cruciform fashion.
Each cutting wing is provided with the usual
crushing surfaces 24 which converge tov de?ne
The shank 2| is hollow, having a passage 40
for conveying cleansing ?uid, as for example water
or compressed air, or both, to a hole being drilled.
The passage III also extends through the stem 28 '20
so that the cleansing ?uid is projected directly
against the point at ‘which the cuttings are
formed and without passing through channels
other than that defined by the shank.
, -
In practice the present invention has been
found to possess certain advantages that are
highly desirable in devices of this character.- By
extending the stem 28 entirely through the drill
bit, rather than form a water passage in the
drill bit, the same volume of cleansing ?uid and 30
under the same pressure may be supplied to the
work irrespective of whether a tight or loose
joint exists between the drill bit and the shank.
As a consequence an uninterrupted stream of
undiminished force may be constantly‘ directed 35
against the work, thus eliminating the chances
of the cuttings plugging up the outlet opening of
radial cutting edges 25. The cutting wings 23 ex-v the passage. Moreover, by utilizing the portions
tend beyond the periphery of the skirt 22, and the of the stem lying forwardly and rearwardly of
40 portions thus projecting are reenforced by'but
tresses 26 extending longitudinally of the skirt
In accordance with the practice of the inven
tion, the skirt 22 is provided with a bore 21 ex
45 tending from end to end of the skirt to accommo
date a stem 28 carried by the shank 2|. The stem
28 extends entirely through the bore 21 and its
front surface 29 is of convex shape and coin-~
cides with partly circular surfaces 30 on the skirt
22 and forming the bottoms of grooves 3| which
de?ne the side surfaces of the portions of the
cutting wings lying vin the plane of the skirt and
the threads as pilots the bit will be restrained 40
from tilting with respect to the stem in the event
that the bit becomes partly unthreaded and in‘
that way the threads will be protected against
damage due to friction between the bit and the
Preferably, the bore 21 consists ‘or an enlarged
A drilling tool, comprising a hollow body por
tion, cutting wings on the body portion, a shank .
extending through theibody portion, interlocking '
threads on ‘the shank and the body portion, pilot 50
portions on the shank forwardly and ‘rearwardly
of the threads to engage the body portion, convex
surfaces between the cutting wings, and a convex
serve as outlets for the cuttings and the cleansing
agent conveying the cuttings from'the bottom of — surface
the hole being drilled.
vI claim:
on the shank coinciding with the said
convex surfaces.
nnwsnn r. TERRY.
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