Single-Disk Drill Page: 3 of 5
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1,124,243
which the spindle 3 projects, said bushing
also having a cylindrical-shaped bearing
portion 6 'of' sihaller diameter. Thecutter
B is provided with an inner bore of two dif-
ferent diameters that conform'to the shape
and-diameter of the two .bearing portions 4.
and ,-on the bushing C, andit is also pro-.
vded. with. 'a -shoulder or thrust bearing.
that -bears against a' coperating shoul-
o .0 d or thrustbearing 8 on the-. bushing
0 .the inner en d of the cutter bearing.
against a flange. 4 on the .bushing.' C
that acts as a thrust bearing.- If desired,
a washer 9 can .be- arranged between the
i outer end of the cutter B and the enlarged
head 3 8onithe spindle that laps over the
cutter, said- washer being preferably set in a.
recess formed in the outer face of the cutter,'
as shown in Fig. 1. A dowel-pin or screw
20 10 in the head A thatprojects into an open-
ing formed in the inner end of the bushing
C holds the bushing stationary with respect
to the head and prevents it from rotating
with the cutter. The cutter Bis kept thor-
25 oughly.lubricated when the drill is in ser-
ice by means of lubricant supplied through
a duct 11 in the head that leads' t ducts 12
in the spindle that communicate with.open-.
ings 13 in the bushing C, asshown in Fig. 1
30 A pocket 14 is prefeably formed in one
side of the head for receivig'the cutter B
so as to' partially protect'the cutter and pre-
vent the sharp cutting edge 1 of sanme from'
catchirng on projections in the whole when
35 the drill is being withdrawn from the hole,
the top wall of said pocket proientjing lat-
erally oer the upper. edge of thecutter B,
as shown in .Fig. 1. The opposite side of:
the head is preferably inclined inwardly,
40 and the duct or opening 15 that is formed
in the head for the flushing water, prefer-
ably terminates in said inclined fae so that
the wash ..water or flushing water will' be
discharged from one side'of the head at a
45 point remote from 'the cutter, thereby pre-
venting the flow of the flushing water from
being impeded by the cutter.'
The cutter B is arranged at one side of
the vertical axis of the. head, a. shown in
50 Fig. 1, and, consequently, the cutting edge
and.the crushing surface 2 of the cutter B
do not act on the material at the center of
the bottom of the hole. In the drill herein
shown the material at the center of the bot-1
55 tom of the hole is disintegrated by a cutting:
surface 16 on the cutter B which lies inter-
mediate the sharp edge 1 ofsaid cutter' and.
the vertical center of the head "A of the
drill, said cutting sui-face 16 being formed,
60 on the outer cylindrical surface of a flange
17 at the inner end of the cutter B of less t
diameter than the diameter of the cutting
edge 1 of the cutter, as 'shown in Fig. 1.c
The specific design of the cutting surface 16
65 is immaterial1 so 'far as my invention is concerned, and while I have herein illustrated
said cutting. surface as consisting of a spiral
groove extending around the outer face of
the .reduced inner end portion 17 of the
cutter, I do not wish it to be understood 70
that my invention is limited to such a con-
struction for the portion '17. of the cutter.
could be provided' ,with any other suitable
type of.cutting surface; 'nor do. I wish it to
be understood that this feature of my in- 75
vention is limited to. use. on a cutter that
forms the entire cutting means of a rotary
drill for 'it could be embodied. in a cutter
that forms only one element or part ofthe
cutting' means of a rotary dril. 80
In operation;"the sharp edge 1 of the cut-
ter B shears off the material from the side.
of the hole and remains sharp by constantly
rubbing against the side of thehole,.and the
portion 2 of the cutter crushes and disinte- 85
grates the material :at the bottom of the hole;
The small core that remains at the center of
the bottom of the hole is crushed and ground
up progressively bythe cutting surface 16'of
the' cutter which, lies between the'sharp edge 9
l of the cutter and the vertical centiror axis
of.the drill head A. The shearing strains on
the spindle 3 are reduced :to a minimum,
owing to-the inclined position of the spindle
and to the-shape of the cutter which is-so 9M
formed that the weight imposed on the drill
head. tends to force the cutter inwardly
against the thrust bearing surfaces: 4a and 6
on the bushing, and there is very little tend-
ency for the cutter to wear away cjui.ddy or '100
become dull, owing to, the fact that it is
mounted on. the head in such.mtn'pner that
the .rear side portion of same does not drg
against the, side of the hole when the dill is
in operation. 105
In a -drill. of the construction above-de
scribed 'ample clearance is provided for the
disintegrated material that is' flushed out of
the hole bythe water introduced through the
hollow drill stem, owing to"the fact that the 110
drill comprises only a single cutter and .a
head which is so proportioned that it does
not'clog up 'the .hole. Consequently, there
is little tendency for the disintegrated ma-
terial to pack in the hole and thus interfere 115
with the operation of. the drill. . The drill
comprises only "a 'few rugged parts which
are strong enough to successfully withstand
the strains to which they are subjected when
the drill is. in service. And another desir- 120
able feature 'of such a. drill is the exception-
ally large bearing surface that is 'provided
for the cutter by means of the bushing C
which is also equipped with end, thrust bear-
ings' for the cutter. Theparticular way that 125
theflushing water is introduced into the hole,
namely, from one side of the head of..the
drill and- at. a poiit'rembte from the cutter,
is novel, and tends to eliminate' packing of
the disintegrated material, owing to the fact 130
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Hughes, Howard R. Single-Disk Drill, patent, January 5, 1915; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth858022/m1/3/: accessed June 28, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.