Rotary Boring Drill. Page: 3 of 5
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UNITED STATES ATENT OFFICE
HOWARD R. HUGHES, OF HOUSTON, TEXAS.
ROTARY BORING-DRILL.1,322,696,
Specification of Letters Patent.
Patented Nov. 25,1919.
Application filed October 29, 1918. Serial No. 260,087.
To all whom it may concern:
Be it known that I, HOWARD R. HUGHEs,
a citizen of the United States, residing at
Houston, Harris county, Texas, have invent-
5 ed a certain new and useful Improvement in
Rotary Boring-Drills, of which the follow-
ing is a full, clear, and exact description,
such as will enable others skilled in the art
to which it appertains to make and use the
10 same.
My invention relates to rotary boring
drills for .use in drilling wells or, mines
in earth or rock. It has particular applica-
tion to drilling in hard formations but will
15 also operate eficiently in soft material.
My device is of the type of rotary drills
usually included under the term roller bits,
wherein the disintegration of the mate-
rial is brought about by the rolling of
20 toothed cutters upon the.bottom of the hole,
thus serving to break up and pulverize the
material which is then washed away and
carried in suspension to the surface by
means of a current of flushing water. This
25 flushing water is pumped down to the bit
through a hollow drill stem and through
channels in the bit and finds an outlet up-
wardly around the sides of the bit and the
drill stem carrying with it all disinte-
3 grated material.
An object of my invention is to provide
a roller bit of the character described which
will operate in both hard and soft forma-
tions and which will be particularly effi-
35 cient in grinding up and disintegrating the
material in such manner that it may be
carried from the hole by a stream of flush-
ing water..
Another object is to construct a drill bit
40 which will cut rapidly and which will not
easily be "reduced in gage so as to cause
the head of the drill to lodge in the hole.
Other objects and advantages will be
pointed out with more particularity in the
45 specifications which follows and the points
of novelty will be set forth in greater de-
tail in the claims.
* Referring to the drawings forming a
part of this specification and wherein like,
50 numerals are applied to like parts.through-
out the several views: Figure 1 is a side
elevation of my invention, one of the. side
cutters being shown in section. Fig. 2 is an
elevation taken at right angles -to the posi-tion shown in Fig. 1, with one of the side 55
sections of the bit removed. Fig. 3 is a
bottom plan view of my invention.
Figs. 4 to 9 inclusive are diagrammati-
cal views illustrating several different for-
mations of cross cutters and also illustrat- 60
ing different ways of inclining the said cut-
ters from the central axis of the bit.
.The head of my improved bit is approxi-
mately cylindrical in outline and has a re-
duced upper threaded shank 2 for attach- 65
ment to the drill stem not shown. The
threaded shank 2 is further reduced in di-
ameter to form a threaded nipple 3 to which
a lubricator, not shown, may be attached.
The head of my bit is split longitudinally 70
along a central dividing line 7. The inner
faces of the longitudinal sections are re-
cessed for a distance approximately the
length of the lower half of the bit, to re-
ceive a central removable web 4. 75
The lower end of the bit is provided with
two sets of cutters; one set of cutters 8 are
mounted in an offset position between an
outer supporting lug 9 and a central sup-
port 10 in the central web 4. These cutters 80
are preferably frusto-conical in shape, as
shown particularly in Fig. 3 and provided
with longitudinal teeth for cutting- pur-
poses, the inner. ends being beveled at 30.
On each side of the two central cross cut- 85
ters 8, I have provided an inclined side cut-
ting disk 5. These cutters are mounted
upon pins integral with the side sections of
the head. Each of the' cutters 5 is frusto-
conical in shape and provided with teeth 6 90
on the outer cutting periphery thereof. The
pins 11 upon which said disks are, mounted
are threaded as shown at 12 to receive a
central bearing member 13, which is frusto-
conical in shape and threaded upon the shaft 95
11 with the'smaller end toward the bearing
face of the side sections. Between this bear-
ing member and the face of the head are
provided-the usual non-friction washers 14.
When these cutters are assembled upon the 100
side of the head the threading of the cen-
tral bearing member 13 upon the shaft 11
is accomplished by the use of a spanner
wrench which is adapted to rotate the bear-
ing member 13 by means of the countersunk 105
recesses 15 in the outer face of the said bear-
ings. Referring particularly to Figs. 1 and
2, it will be seen that the cross cutters 8 are
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Hughes, Howard R. Rotary Boring Drill., patent, November 25, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1258917/m1/3/?q=%22%22~1: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.