Rotary Cutter for Roller Drills Page: 3 of 3
[1], 2 p. : ill. ; 23 cm.View a full description of this patent.
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1,325,086
upon the threaded shaft 7 of the drill. In
order to hold the cutter and locking ring
non-rotatably upon the bushing, while, the
assembled cutter and bushing are being
5 threaded upon the shaft, I have shown a
tapered opening 14 in opposite sides of the
cutter near the base thereof. This opening
extends through the cutter,,the locking ring
and the bushing, so that a tapered pin or
10 wrench 15 may be inserted therein so as to
hold these elements, the cutter, the bushing,
and locking ring together while the bushing
is being threaded on the shaft. When the
cutter has been secured in position, the
15 wrench or pin 15 may be withdrawn and a
set screw shown at 16 may be threaded into
the alined openings in the locking ring and
the cutter, thereby filling up the opening so
as to prevent the entrance of water or grit
20 about the bearings and serving also to lock
the cutter and locking ring rotatably to-
gether, thus also further securing the lock-
ing ring within the recess 11 in the cutter.
, In assembling the locking ring within the
25 cutter the bushing. will be' first inserted in
position within the cutter and the locking
. ring 10 will be contracted by having its
ends forced tightly together, and in this con-
tracted position its outer diameter will be
30 small enough to pass within the outer diam-
eter of the tapered seat 11 in the face of the
cutter. It will then be released and resili-
ency of 'the ring will force it tightly into
its seat. It will then be-locked in expanded
35 position by means of said set screw 13 aspreviously described. The cutter and lock-
ing ring will then be rotatable upon the
bushing and the cutter will be held against
removal from the bushing by the ring.
Having thus described my invention, the 40
objects and advantages of which will be ap-
parent without further description, what I
claim as new and desire to protect by Let-
ters Patent is:
1. In a roller drill bit, a cutter shaft, a 45
bushing thereon, a cutter on said bushing,
registering annular recesses in the inner
faces of said bushing and said cutter, a split
resilient ring in said recesses, and an ex-
panding set screw adapted to retain said 50
ring in expanded position.
2. In a drill bit, a bushing, a cutter there-
on, enclosing the end of the same, said cutter
and bushing being recessed to provide a seat'
for a ring, a split ring in said-seat, said ring 55
being wider toward the bottom of said seat,
and means to prevent contraction of said
ring.
3. In a roller drill bit, a cutter shaft, a
bushing secured thereon, a cutter surround- 60
ing the end of said bushing, means to retain
said cutter on said bushing comprising an
annular groove on the upper adjacent faces
of said cutter and said bushing, an expand-
ing ring fitting in said groove and adapted 65
to lock therein and means to retain said
ring in expanded position.
In testimony whereof, I hereunto affix my
signature this the 6 day of June, 1919.
LOUIS A. GODBOLD.2
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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/m1/3/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.