US1914042A - Double socket eccentric rock bit - Google Patents

Description

June 13, 1933.

` t, E'. L. Hai

sa? 1M IIIIIIIII julle E. L. RATH s EccENTRIc Rocx B Patented June 13, 1933 UNITED STATES .EDWIN L. RATH, F EDMONTON, ALBERTA, CANADA DOUBLE SOCKET ECCENTRIC ROCK BIT Application led March 24, 1932. Serial No. 600,989.

This invention relates to a bit that is especially designed for drilling in rock formations, and it principally aims to provide a double socket eccentrically operating bit adapted for use with either the drilling of deep oil Wells, for surface drilling, or otherwise, and which has a novel gyratory motlon, to insure engagement with and over the top of any obstacle in its path, to insure the drilling of a straight hole, and thereby effect a saving in the cost of casing, in the cost of operation, and also providing a construction which has few parts, may be inexpensively manufactured, is faster in operation and will secure the results generally, in a more speedy and less expensive manner.`

The more specific objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings Figure 1 is a view in central vertical section illustrating the improved bit,

Figure 2 is a cross sectional View taken on the line 2--2 of Figure 1,

Figure 3 is a cross sectional view taken on the line 3-3 of Figure 1,

Figure 4 is a vertical central sectional View 30 through the bit taken at a right angle to Figure 1,

Figure 5 is a top view of the disk plate,

Figure 6 is an inverted plan View of said disk plate, v

Figure 7 is a central vertical sectional view through an under reamer, and

Figure 8 is a bottom or inverted plan view of said under reamer.

Referring specifically to the drawings, the 4 bit is carried by a hollow metallic body, frame or casing generally designated 10, such body being adapted for connection to a drill string by means of a cap as suggested at 11, screw threaded at 12 into the body, such cap hav- 5 ing a bore 13 and screw threads 14 adjacent the same, facilitating attachment to the drill line.

At the lower end of the body 10 is a headl adapted to rock or move in engagement with a correspondingly shaped surface afforded -by a lining 17 of wear reducing material suitably secured to the body, the latter being thickened as at18 to afford a more extended 5i bearing surface. A shank extends from the hemispherical portion 16, being designated 19 and terminating in a ball 20.

In order to hold the head 15 in place, a tube or the like 21 is arranged diametrically of the body 10 and Welded or otherwise secured thereto. Such tube in its under surface has a slot of key hole shape at 22 through which the ball 2O and a portion of the shank 19 are adapted to extend, in order that the ball may 6 engage a bearing 23 rigidly secured Within the tube. Said ball is also engaged by a removable and adjustable bearing block 24, held against detachment from the tube 21 by a nut 25 screw threaded therein, and prefer- 7 ably provided with a socket 26 of a shape facilitating engagement with a wrench. A lock screw may be provided at 27 to prevent accidental movement of the nut 25. In order to elliciently lubricate the bearings 23 and 24 7* at the zone of contact with the ball 20, a grease cup or fitting is provided at 28, preferably being of the type through which grease is forced under pressure by means of a grease gun or equivalent. 8 A disk plate or cutting plate is adapted for connection to the head 15, the same being designated 30. Preferably the plate 30 has a stud 31 of conical form detachably screw threaded at 32 in an opening of the hemi- 8l spherical portion 16. The plate 30 has an annular ange at 33 and the plate is generally of conical form at its lower or working surface and over said surface and ange,

a plurality of cutting ribs or teeth 34, pref- 91 erably `V-shape in cross section, are formed.

In order that water or lluid may be supplied to the cutting teeth 34, and oil or fluid may be permitted to escape from the well, registering circulation ports or passages are provided at 34 and 35 in the hemispherical portion 16 and plate 30.. In addition, and for the same purpose, such portion 16 and plate 30 are spaced apart as at 36 and the space has passages 37 leading therefrom to the teeth. The space 36 is provided, by the engagement of spacing lugs 38, which may be provided on the plate 30, contacting wlth the hemispherical vportion 16. Obviously said spacing members 38 may be provided on the portion 16' in lieu of the plate 30, 1f desired.

In order to eliciently lubricate ,the zone of engagement of the hemispherical portion 16 and lining 17, a lubricant reservoir 1s provided within the body 10 as at 40. Lubricant from the reservoir 4:0 is adapted to flow through a tube 41, secured to the body 10 and in communication with a port or passageway 42 which leads directly through the lining 17 and to the said zone, the lubricant lowing from the tank 40 by gravity.

As a result of the construction described, the rotation of the bod 10 imparts a sort of wobbling motion to t e head 15 whereby the teeth 34 oneby one and successivel come in contact with the rock or soil being rilled. The surface of the cutter 30 engaging the rock or earth, is substantially parallel thereto, thus positively engaging all material in the path of cutting and avoiding any sliding motion of the teeth, especially insuring straight drilling in the case of encountering an anticline. This feature also tends to keep the teeth sharp and the eccentric mounting shown is a double swivel mounting to the' head and also provides longer teeth on the plate 30, within the confines of the imaginary cylinder extended from the body 10.

In lieu of the cutter plate 30, a cutter plate 50 may be substituted as when enlarging a hole or underreaming. The cutter 50 is detailed in Figures 7 and 8 and substantially corresponds to the construction of the cutter 30 aside from the fact that the under surface is spherically concaved as at 51 and has cutting teeth 52, triangular in cross section but radially conforming to such concave form. rIhe cutter 50 by means of a threaded stud 5,3, may be screwed into the opening or socket 32. Said cutter 50 also has passages or ports 54 therethrough adapted to function similarly to the ports or passages at 35 and 37 and f' in addition, such cutter 50 has spacing lugs, l preferably integral therewith, at 55, to function-similarl to those at 38.

Various c anges may be resorted to provided they fall within the spirit and scope ofv the invention.

I claim as my invention l. A rock bit comprising a carryin body, a tool rotatably mounted on the bo y, said tool consisting of a head, a cutter on the lower end of said head and having its longitudinal axis inclined with respect to the body axis, said head and cutter having fluid passages therethrough, a flange on the cutter surrounding the head and forming part of the cutting surface, and means spacing the cutter and head apart at portions thereof for remesa the passage of Huid therebetween.

2. A rock bit having a body, a rotatable head havin respect to t e body axis, said head having a hemispherical portion in bearing contact with the body, means disposed diametrically on the body providing a bearing, a shank extending from said portion having a ball removably connected to and journaled in the bearing, and cutting teeth on said portion.

3. A borin tool of the class described comprising a bo y, a tube secured in said body, a bearin carried by the tube and having a removab e part, said tube having a key hole slot, means to secure said movable bearing part in the tube, a rotatable shank having a ball located between said bearing members and applicable through said slot, a hemispherical portion carried by the shank and having bearing contact with the body, and cutting means carried by the said portion.

In testimony whereof I affix my signature.

i EDWIN L. BATH.

its axis of rotation inclined with

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