Rotary Cutter for Roller Drills Page: 2 of 3
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UNITED STATES PATENT OFFICE.
LOUIS A.. GODBOLD, OF HOUSTON, TEXAS.
ROTARY'CUTTER FOR BOLLER-DEILLS.Specification of Letters patent. Patented Dec. 16,1919.
Application filed June 16, 1919. Serial No. 304;507.To all whom it may concern:
Be it known-that I, Louis A. GODBOW, a
citizen of -the United States, residing at
Houston, Harris county, Texas, have invent-
5 ed a certain new and useful Improvement in
Rotary Cutters fort Roller-Drills, of which
the following is a full, clear, and exact de-
scription, such as will enable others skilled
in' the art to, which it appertains to make
10 and use the same. /2
My invention relates to an improvement
in locking means 'for securing a rotary cut-
ter upon its bushing. It has special refer-
ence to a means of locking the cutter of a
15 rotary drill bit upon the cutter shaft of the
drill. This invention is a modification of
my co-pending application filed jointly with
another of even date herewith Serial No.
304,508 on an improvement in drill cutters
20 for rotary boring drills. .
-The object of my invention is to provide
a means for locking the rotary cutter rota-
tably upon its bushing. In this form of ro-
tary drill the cutter is arranged to inclose the
25 end of the bushing and the cutter shaft upon
which it is mounted, and is retained on said
bushing by means of a locking ring. This
locking ring is ordinarily threaded onto the
cutter and thereby maintained securely in
30 contact therewith so as to retain the cutter
on the bushing. In my improvement I con-
template locking the cutter by means of a
ring which may be sprung into a tapered
seat in said cutter and thus retain the same
35 in position. -Said ring is itself retained in
expanded position on said cutter by virtue
of a threaded set screw or other similar de-
vice.
In the drawings forming a part of this.
40 specification I have shown my preferred em..
bodiment of this invention, it being under-
stood, however, that slight modifications and
changes may be made herein without depart-
ing from the spirit of the invention therein
45 disclosed. .
Figure 1 is a central longitudinal section
illustrating the application of my invention
to a frusto-conical shaped cutter. Fig. 2 is
a bottom plan view, partly diarammatic,
so further illustrating the same. Like numer-
als of reference are applied to like parts in
both the views.
The cutter disclosed in the drawing is
somewhat frusto-conical in shape, having a
5s tapered cutting surface 1, the forward end
of which is truncated to provide a flat for-ward face 2, also toothed to disintegrate the
material coming into contact therewith. The
inner end of the cutter is also tapered some-
what as shown at. 3 and toothed at 3' to dis- 60
integrate material at the side of the hole
a ainst which this-portion of the cutter is
a apted to contact. The bottom or-inner end
portion of the cutter is flattened as shown at
4 for contact with an anti-friction washer 5. 65
The cutter is provided with a tapered re-
cess on its inner face forming a smooth bear-
ing surface for rotation upon a tapered bush- -
ing 6, said bushing being flattened' on the
forward end -to correspond generally in 70
shape with the cutter. - This bushing is
threaded interiorly upon a shaft or pm 7,
which, in this embodiment, is integral with
the forward end of the head 8 of the bit,
not. shown. The bushing .6 is cut away 75
or recessed at 9--on its inner end to provide
a seat for a locking ring 10, the cooperat-
ing inner face of the cutter is also recessed
to bear against the outer face of the said
locking ring 10. This cut-away portion 11 80
is tapered slightly inwardly, as, shown in
Fig. 1, and the locking ring 10 is wider
on its upper end to fit, when expanded,
within said tapered recess 11 in- the cut-
ter. The ring10 is also split in one place, as 85
shown at 12, to provide a space for contract-
ing the ring'when the same is to be inserted
within its seat.in the cutter.
In order to lock the ring securely in posi-
tion within the tapered recess 11, a set screw 90
13 is used. Adjacent ends of the split ring
10 are recessed slightly to provide a tapered
seat for this said set screw. This screw is
tapered so as to have a wedge effect when
threaded within the recesses in the ends of 95
the split ring, thereby, forcing them apart
and holding the ring expanded firmly into
the.eeat 11, on the inner face of the cutter.-
It will thus be apparent that when properly
expanded the wider.inner'end of the ring 100
will render it impossible for the ring to be
forced from its- seat and thus allow the
cutter to be lost in/the well.
It is.contemplated that the 'ring can be
-fitted within its seat in the cutter, to hold 105
the cutter and bushing 6 in assembled posi-
tion, while the cutter is still in the shop.
When the cutter, thus locked in position'
upon the bushing, is shipped. to the field,
where it is to be used upon the bit, all that 110
will be necessary for the driller to do will
be to screw the assembled cutter and bushing1,325,086.
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Godbold, Louis A. Rotary Cutter for Roller Drills, patent, June 16, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257922/m1/2/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.