Drill-Bit Page: 2 of 3
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UNITED STATES PATENT OFFICE.
JOHN G. KILGORE, OF DAYTON, TEXAS.
DRILL-BIT.Specification of Letters Patent.
Patented June 4, 1918.
Application filed March 26, 1918. Serial No. 224,813.
To all whom it may concern:
Be it known that I, JoHN G. KTLGORE, a
citizen of the United States, residing at Day-
ton, in the county of Liberty and State of
5 Texas, have invented certain new and useful
Improvements in Drill-Bits, of which the
following is a specification.
This invention relates to drill bits for oil
wells and has for its object the provision of
10 inexpensive and efficient means whereby the
bit will be lubricated in its passage through
the earth and the adhesion of gummy or
similar substances will thereby be avoided.
The invention is illustrated in the accom-
15 panying drawings and will be hereinafter
fully described, the novel features being
subsequently pointed out in the appended
claims.
In the drawing-
20 Figure 1 is an edge elevation, partly in
section, of a bit embodying my improve-
ments.
Fig. 2 is a side elevation of the same.
Fig. 3 is a horizontal section on the line
25 3-3 of Fig. 1.
Fig. 4 is a horizontal section on the line
4-1 of Fig. 1, looking in the direction of
the arrow.
Fig. 5 is an enlarged detail vertical sec-
30 tion.
The bit illustrated is of the fish tail type,
the point or penetrating wedge being in a
form closely resembling the tail of a fish
and being connected by a reduced neck 2
35 with a body 3, the said body being externally
threaded so as to be secured in the lower end
of the tubing. At the juncture of the neck
and the threaded portion of the body is an
annular enlargement 4 which provides a
40 stop to limit the entrance of the bit into the
tubing, and through the threaded body are
passages 5 having their lower ends opening
through the under surface of the enlarge-
ment 4 so' as to permit the oil to pass into
45 and rise through the tubing. In the under
side of the enlargement and the exterior of
the neck immediately adjacent the enlarge-
ment are grooves 6 into which the upper
edge of a covering 7 may be drawn. This
50 covering should be of some absorbent ma-
terial which will hold oil and may be easily
saturated therewith and I employ the pelt
of an animal with the flesh side disposed out-
wardly. The pelt is drawn closely around
55 the neck and the edges of the pelt are thenjoined by stitching, as indicated at 8,. and
the thread used for the stitching is passed
around the upper edge of the pelt exteriorly
thereof, as shown at 9, so that when the
thread is drawn taut the pelt will be held 60
firmly in the grooves 6 and will be stretched
smoothly over the neck of the bit. To fur-
ther aid in holding the pelt in place, trans-
verse openings are formed through the neck,
as indicated at 10, and the thread is passed 65
through the said openings, as shown clearly
in Fig. 3. At the lower end of the neck and
the upper end of the point 1, grooves 11
similar in all respects to the grooves 6 are
provided and the lower edge of the pelt is 70
drawn into the said grooves and secured
therein in the same manner as the upper
edge of the pelt is secured in the grooves 6.
The bit is operated in the same manner as
other bits now commonly employed for driv- 75
ing oil wells. Before starting operations,
however, the covering 7 is secured in place
and saturated with some oil and it will be
readily seen that an extensive lubricant-con-
taining surface is thereby provided. As the 80
bit is rotated to penetrate the earth the lu-
bricant-carrying pelt will be caused to wipe
against the adjacent portions of the earth
and the choking of the bit will be thereby
avoided and its downward progress facili- 85
tated. The adhesion of gummy substances
which may be contained in the ground will
be also obviated. Surplus oil which may be
in the pelt will collect into the lower grooves
11 and will overflow in a thin stream over 90
the point 1 and will, consequently, lubricate
the point so that it will perform its proper
functions readily and without a tendency to
choke. The construction is such that the
pelt or other absorbent vehicle will be held 95
closely and smoothly to the bit and may be
easily removed when worn out and a new
pelt substituted. The cost of the lubricating
carrier will be trifling and it may readily
be applied to any bits now in use. 100
Having thus described the invention, what
I claim as new is:
1. A drill bit having an absorbent lubri-
cant carrier secured thereabout.
2. A drill bit comprising a point, a body 105
and a reduced neck connecting the point and
the body, and an absorbent lubricant car-
rier secured around the said neck.
3. A drill bit comprising a point, a body
and a reduced neck connecting the body and 1101,268,474.
4
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Kilgore, John G. Drill-Bit, patent, June 4, 1918; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1256805/m1/2/?q=%22%22~1: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.