US 2526838 A
Description (OCR text may contain errors)
Oct. 24, 1950 s, AKEYSON 2,526,838
DISK TYPE OF ROTARY BIT Filed May 14, 1946 QAQQv a AU MW INVENTOR. Swan M. fikeysozz.
1 7 T TOR/V5)? Patented Oct. 24, 1950 UNITED STATES NT OFFICE 2 Claims.
This invention relates to a disc type rotary bit, and the prime object of my invention is to provide an efiective means whereby the circulation of fiuid can be directed to the bottom of the drilled hole.
Another object of my invention is to provide a novel rotary bit of the disc type in which the inner discs can be placed very close together and thus effectively breaking the center core and thereby cutting a clean hole for the entire diameter of the bit.
Still another object is to provide a novel disc type rotary bit in which the legs are welded to the tool joint, these legs being cut off of the tool joint when it is necessary to replace the discs.
A feature of my invention is to provide a rotary bit of the character stated, in which the inside cutters are welded to the pin, the pin in turn being journaled in the legs.
Another feature of my invention is to provide a rotary bit of the character stated, in which the fluid holes in the tool joint are elongated at the outer ends, thus permitting easy assembly of the bit legs, and also permitting shifting of these legs prior to welding, and when it is desired to correct or change the cutting diameter of the bit.
Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description, and the appended claims.
In the drawing- Figure 1 is a top plan view of my bit.
Figure 2 is a side elevation of the same.
Figure 3 is a top plan view of the tool joint prior to the installation of the legs.
Figure 4 is a longitudinal sectional view of my rotary bit.
Referring more particularly to the drawing, my rotary bit l includes a tool joint 2, which has a threaded pin 3 by means of which the bit is attached to the drill pipe, all of which is usual and well-known. A fluid bore 4 extends into the pin 3, and a central fluid passage 5 directs the fluid onto the inward cutters. A pair of fluid ducts 6 and I extend outwardly at an angle from the bore 4, and the outer ends of these ducts are elongated, as shown at B and 9 respectively. The purpose of the elongated openings 8 and 9 is to facilitate assembly of the legs of the bit and also to permit these legs to be shifted in order to vary the cuttin diameter of the bit. A pair of legs I 9, l l are welded to the tool joint 2, substantially as shown in Figures 2 and 4. The legs l and H are provided with fluid ports I2, 13 respectively, which direct circulating fluid to the bottom of the hole. The ports 12 and I3 extend angularly through the legs l0 and II so as to avoid the cutter pins l4 and I5. The pins l4 and I are journaled in the legs I0 and II respectively, and the manner in which the discs are mounted on each of these pins is identical. sembly will be described.
An outer disc is is welded or otherwise fixedly attached to the outer end of the pin. An inner disc I7 is welded to the inner end of the pin. The discs are assembled on the pin before the legs are welded to the tool joint. Due to this method of construction, it is possible to place the inner discs ll very close together, as shown in Figures 1 and 2. Consequently, these inner discs will effectively break up the core, which is characteristic of rotary bits. When it is necessary to replace the discs, the legs IG and H are cut off of the tool joint, and new legs, with new discs assembled thereon, are welded in position.
Having described my invention, I claim:
1. A rotary bit comprising a tool joint body, a pair of legs welded to the body, a pin journaled in each of the legs, a cutter disc fixedly mounted on each end of the pin, said body having fluid passages extending longitudinally thereof, said fluid passages each having an elongated opening at the lower end of the body said elon gation extending transversely of the body, each of said legs having a fluid conduit extending longitudinally thereof, said fluid conduits each communicating with one of the fluid passages in the body.
2. A rotary bit comprising a tool joint body, a pair of legs welded to the body, a pin journaled in each of the legs, a, cutter disc fixedly mounted on each end of the pin, said discs being welded onto the pin, and the inner discs being closely positioned relative to each other to break up the central core, the adjacent faces of the inner discs being flat, whereby said discs are closely positioned said body having fluid passages extending longitudinally thereof, said fluid passages each having an elongated opening at the lower end of the body said elongation extending transversely of the body, each of said legs having a fluid conduit extending longitudinally thereof, said fluid conduits each communicating with one of the fluid passages in the body.
SWAN M. AKEYSON.
Only one as- REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,238,407 Hughes Aug. 28, 1917 1,255,422 Hughes Feb. 5, 1918 1,749,344 Hild Mar. 4, 1930 1,867,545 Akeyson July 19, 1932 1,995,389 Howard at al Mar. 26, 1935 2,049,543 Kaminerer Aug. 4, 1936 2,151,348 Fischer Mar. 21, 1939 2,238,895 Gage Apr. 22, 1941