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Патент USA US2107495

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Feb.‘8, 1938.
Filed April 8, 1956
Patented Feb. 8, 1938
William Otto and Francis Elmer Scott, Kansas
City, Mo.
Application ‘April 8, 1936, Serial No. 73,222
3 Claims. (Cl. 255—39)
This invention relates to improvements in
drilling apparatus, more especially in core drills,
and its objects are as follow;
First, to provide a core drill to be used in drill
5 ing for oil, gas and water, and which is of such
a construction that it can be attended by one
Second, to provide a drill of the character de
scribed which when used for any of the fore
going purposes or for the drilling of test and
shot holes in mining and tunnel work, is adapted
to pumping out the core cuttings and removing
the same to the surface of the ground so that the
kind of earth formation through which the bit
' is passing can be inspected at any and all times
without ceasing drilling operations.
Third, to provide a drilling apparatus which is
made so light that it can be moved in a small
trailer by any ordinary kind of automobile.
Other objects and advantages will appear in
the following speci?cation, reference being had
to the accompanying drawing in which
Figure 1 is a central vertical section of the bit
carrying body which functions as a pump.
Figure 2 is a detail side elevation of the drill
If) Lu
bit which screws on to the bit body.
Figure 3 is an elevation of the framework of
the drill rig, showing the drill in position.
Attention is ?rst directed to Figure 1 which
illustrates the previously mentioned bit body
or so called pump. This body has chambers l,
2 and 3 through which core cuttings pass. A
transversely situated pin 4 limits the upward
movement of a ball valve 5.
This ball valve is
3 displaced to the dotted line position 5a from its
normally occupied seat 6 in order to allow core
cuttings to pass on their way to the surface.
Holes, such as ‘I, 8 and 9 (Fig. 1) and In (Fig.
3) are bored into the bit body so that they com
municate with the chamber 2. These holes are
situated on sharp angles. They are directed up
wardly toward the ball valve 5 and thus facili—
tate the passage of the cuttings toward and past
the ball valve.
The bit body, or pump as it has been called, is
now designated ll. At its upper end it has a
standard left-hand pipe thread l2. At its lower
end it has a heavy left-hand thread I3 to match
the correspondingly threaded socket in a known
type of drill bit M. This is known as an air
hammer bit. It has cutting edges IS. A hole [6
beginning at the internally threaded socket and
going through the bit admits core cuttings from
55 the bottom of the hole to the pump II to be
pumped out to the surface through the drill stem
as will be understood.
Reference is now made to Figure 3.
A rub
ber hose 25, of which only a small portion is
shown, disposes of the core cuttings. This hose 5
is attached by means of a swivel joint 26 to a
heavy 11A" drill stem 21. This drill stem is
made up of heavy pipe sections with screw joints
on the inside. This arrangement leaves the stem
smooth on the outside.
A support 28 carries a screw 29.
This screw is
in the form of a. sleeve through which the drill
stem 21 passes, the function of the screw sleeve
being to regulate the working of the bit H on the
bottom of the hole, this being accomplished by
turning the handle 293 as cutting proceeds.
A heavy steel spring 30 imparts a quick and
added force to the down stroke of the drill. This
insures fast cutting. A clamp 3| on the drill stem
21 provides a rest for the bottom of the spring
30, the other end of the spring abutting the screw
sleeve 29. A guide 32 of any appropriate type
guides the drill stem 21 in its reciprocation.
A lift is generally designated 33. The showing
is‘ to be considered as conventional. Actually the 25
lift can be made in a number of ways in order to
raise the drill stem 21 anywhere from 3 to 6"
as may be desired. This lift will be timed to
raise the drill stem about two hundred times per
minute. It will take hold of the drill stem when 30
the bit I4 is on the bottom of the hole, raising
the drill stem and releasing it when the lift is
completed. It is then that the spring 30 im
parts a powerful down thrust.
What we claim is:-—
1. A core drill comprising a hollow stem hav
ing a cutting bit attached to the lower end there
of, lift means applied to the stem medially of its
ends and so operable as to periodically lift the
stem, a rig which has means to guide the stem,
a spring carried by the stem, said stem having
an abutment with which one end of the spring is
in engagement to resist the lifting effort of said
lifting means, and a screw sleeve against which
the other end of the spring abuts, said sleeve slid 45
ably carrying the stem, said rig having a sup
port in which said sleeveis screwed for adjust
ment to vary the tension of the spring.
2. A core drill comprising a hollow drill stem,
composed of pipe sections having inside joints 50
which provide the stem with a smooth exterior,
a cutting bit and means connecting the cutting
bit to the lower end of the stem, a rig which has
guide means for the stem and which has a screw
support, a spring coiled around the stem and 55
-‘ 2
clamp on_the;stem, an externally threaded sleeve
prising a body‘ with openings to admit the cut
tings and a valve to control the passage of;said
screwed throigh said screw support, slidably' car
rying and guiding the stem in addition to said
only a. downward pressure so as togdrive the bit
having one of its ends in engagement with a
guideimeans, and being abutted at one’ of its ends
by the otheriiend of the spring, said stem being
adjustable in'the screw support to vary the ten
sion of the spring, and means to periodically lift
the stem against the tension oi the spring.
3. A core drill colnprising ' a. hollow stem, a
hose and means by which to connect said hose
to the uppepend of the stem to carry away cut
tings, a cutting bit and means connecting said
bit to the lower end of the stem, said means cem
cuttings into the stem, a spring which exercises
to its work, a rig on which the stem is guided,
a pair of abutment means respectively on the
stem and on the rig with which the opposite
ends of the spring; contact to force the cutting
bit down as stated, and lift means operating on
the stem {medially/of its ends to produce lifting
movements of the stem against the tension of
the7 spring.
F. ELMljR sco'r'r.
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