Drill-Collar. Page: 2 of 3
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UNITED STATESPATENT OFFICE.
GEORGE S. MYERS, OF ELECTRA, TEXAS.
DRILL-COLLAR.Specification of Letters Patent. Patented Mar.16, 1915.
Application filed April 8, 1914. Serial No. 830,474.To all whom it may concern:
Be it known that I, GEORGE S. MYERS, a
citizen of the United States, residing at
Electra, in the county of Wichita and State
5 of Texas, have invented new. and useful Im-
provements in. Drill-Collars, of which the
following is a specification.
This invention relates to drill collars and
in particular to collars used upon rotary
10 drills of the type which are water-flushed.
In drills of this type, it is the usual practice
to employ a collar which is threaded onto
the lower end of the operating drill pipe and
is adapted for threaded connection with the
15 bit. The threaded connection between the
bit and collar, though substantially water-
. tight, is objectionable for the reason that
the threads are apt to become worn and dis-
torted by the incessant shock incident with
20 the impact of the bit against the rock
through which it is cutting, whereby the bit
* is apt to become detached while operating in
the bore. A detached bit, as-should be read-
ily understood by persons familiar with the
25 art to- which this invention relates, is al-
. ways a source of great inconvenience, and,
when it can not be recovered, it necessitates
the abandonment .of .the bore, which means
that a new bore must be drilled, possibly
so after.days and weeks of fruitless effort ex-
pended upon the original bore. It is, there-
fore, my purpose to provide a. drill collar
having means embodied therein for seuring
the drill bit. positively thereto and in a
36 manner which precludes the possibility of
- accidental detachment while in use.
A 'further object of the invention is to
provide a collar of this character wherein
the-means for securing a drill bit thereto is
40 in the form of-a wedge-shaped key which
extends transversely through slots provided
in the same.
A still further object is to provide a se-
curing key of this construction which is ad-;
45 justable within the slots so as to permit ef-
fective binding 'of the bit in position, but
which is provided with means for prevent-
ing loss of the flushing liquid through the
collar slots, though the flow of the same onto
50 the bit is uninterrupted.
The invention consists in the features of
construction, combination, and arrangement
of parts, hereinafter fully 'described and
claimed, reference being had to the accom-'
55 panying drawings, in which:
Figure 1 is a side elevation of the collarmounting a bit upon a drill pipe, the latter
being broken away ; Fig. 2 is a longitudinal
sectional view on line 2-2 of Fig. 1; and,
Fig. 3 is a transverse sectional view on line 60
3r-3 of Fig. .
In -the drawing, the numeral 1 designates
a portion of the ordinary form of drill pipe,
whose lower end is externally screw-thread-
ed at 2 for engagement within the threaded 65
socket 3 provided in the upper end of my
improved collar 4. This collar is provided
in its lower end and in communication with
the socket 3 with a longitudinally tapered
socket 5, which.is substantially rectangular 70
in transverse section, for the snug reception
of the shank 6 of the drill bit 7. The bit
'socket 5 of the collar is provided in its op-
posite side walls with longitudinally ex-
tending grooves 8 which lead downwardly 75
from the socket 3 and form liquid ducts
which are adapted to register with the con-
ducting grooves 9 formed in the correspond-
ing sides of the bit. The collar is provided
further with a transverse key slot 10 in corn- 80
munication with the socket 5. This slot'is'
adapted to receive a' diametrically adjust-
able securing key 11, the lower' face 14 of
the latter being disposed at right angles to
the axis of- the drill collar: irrespective of .85
adjustment. This key is adapted to extend
through the slot 15 provided in the shank
6 of the drill bit with its inclined upper
face 12 in active engagement with the in-
clined upper wall 13 of the said slot. The 9o
small and large ends of the-key '11 are screw-
threaded as at 17 and 18 respectively. Ad-
justing nuts 19 and 20 are engaged with the.
said threaded ends 17 and 18 of the key and
are adapted to 'be countersunk within en- 95
larged recesses 21 and 22, which are pro- -
vided in the sides of the collar in communi-
cation with.the key slot. These recesses are
constructed larger in diameter than the key
slot so that the marginal edges of the ad- ioo
justing nits will extend past the edges of
the slot so as to seal the slot and thus pre-
vent leakage of the flushing liquid there
through.
'From the foregoing description, taken in 105
connection with the accompanying draw-
ings, it'should be apparent that the securing
key - -ill fasten the bit shank securely within
the collar socket, so as to obviate danger of
accidental detachment thereof, and that the-110
nuts tiy which the key is adjusted, either in
attaching or detaching the same, will serve1,132,375.
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Reference the current page of this Patent.
Myers, George S. Drill-Collar., patent, March 16, 1915; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth859726/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.