US2614810A - Rotary bit - Google Patents

Description

QcLZl, 1 952 c. c. GOOLSBEE ,6 ,8 ROTARY BIT Filed June 16, 1947 5 Sheets-Sheet 2 (IZARZH'C GOOLSBHE" INVENTOR B) y 5 g A TTORNEYIS Oct. 21, 1952 c. c. GOOLSBEE 5 3 ROTARY BIT Filed June 16, 1947 v a sneets-smaet :5

ATTORNEYS Oct. 21, 1952 c. c. GOOLSBEE v ROTARY BIT Filed June 16, 1947 5 Sheets-Sheet 4 i9; 4 ZIARLH a 600M559 DWFNTOR B if 6M ATTORNEYS' Oct. 21, 1952 c. c. GOOLSBEE 2,614,810

ROTARY BIT Filed June 16, 1947 5 Sheets-Sheet 5 (HARLEY (f GOOLJ'BEE INVFNT 012 AT T ORA UL Patented Oct. 21, 1952 ROTARY BIT Charles C. Goolsbee, Houston, Tex., assignor to Reed RollerBit Company, Houston, Tex a corporation of Texas Application June 16, 1947, Serial No. 754,922

7 Claims.

This invention relates to improvements in rotary bits and refers more particularly to a bit that may be economically fabricated, and the fabrication of which requires a minimum of machine work, the bit being made up of two pairs of segmental parts, one pair of which may be used either in drag-type bits or bits having in combination both drag and roller type cutters.

In the interest of economical fabrication of bits and parts thereof, it is desirable when possible to have a standardization of parts going into different types of bits. It is also desirable to use forgings or the like for the parts of the bits and to form the parts in such manner that on assembly into a bit a minimum of machine or other? tool work is required.

An object of this invention is to provide a rugged bit made up of segments individually formed and requiring a minimum of machine or other special tool work.

Another object is to provide a rugged bit made up of segments individually formed and requiring a minimum of machine or other special tool work which, when made up has flush passages for drilling fluid formed therein without the re-L'i. Q quirement of drilling or other special tool work.

A further object is to provide a bit segment having an integral drag blade, the segment being useable alternatively in making up drag bits or bits with combination drag and roller cutters.

Another object is to provide a bit segment having an integral drag blade, the segment being useable alternatively in making up either drag bits or bits with combination drag and roller cutters,

wherein on. assembly flush passages for directing? drilling fluid on the drag blades are formed without requirement of drilling or other special work.

Other and further objects of thisinvention will appear from the following description:

In the accompanying drawings which form aw in Fig. 1;

Fig. 3 is a side-elevational view of the bit segments of Fig. 2 shown in assembled relation;

Fig. 4 is a view taken along the line 4-4 in Fig. 3 in the direction of the arrows;

Fig. 5 is a bottom plan view of the assembly shown in Figs. 3 and 4; and

Fig. 6 is a side-elevational view of a bit. i l

Referring to the drawings, it is believed that the invention can be more readily understood by first having reference to the Figs. 2 to 5 inclusive, illustrating one pair of the segmental parts which go into the construction, and form component parts of the assembled bits illustrated in Figs. 1 and 6. It should be borne in mind that the assembled bits of both figures of the drawings'are made up of two pairs of bit segments, one pair of which may beused alternatively in making up either of the bitsinFigssI and fip Thispair of segments is shown in exploded position in Fig. 2

modified and illustrates the contour of both sides'of the segment.

The bit segment has a portion I0 which makes up a part of the pin l I of the assembled bit, and has another portion l2 which provides a dragtype cutter blade I3. The segment, of course, is one integral piece and preferably is a forging.

In order to provide a passage for directing drilling fluid over the blade cutters 13 in operation, each of the cutter segments are formed with a part which on assembly of the bit cooperates holes in either the segment or bit body. This step ter blades may be used in a bit of the typeihaving both drag blades and roller cutters, the segment is provided with a portion i ii which may be drilled to form a flow passage, as shown at IT. The passage at I! serves to direct drilling fluid upon the roller cutters of the assembled bit and are not drilled unless the segments are to be employed in a bit having roller cutters.

The pair of bit segments, which areeriiployed in conjunction with the pair of segments shown in Figs. 2 to 5, inclusiva on assembly of the bit provide the remainder of the pin, except for the welding material employed to join the bit segments together as is clearlyshown in Fig.1. In :this figure of the drawings, the part It constitutes one of the pair of segments and is welded to the segments of the other pair as shown at l9.

If a bit is to be made having roller cutters as well as blade cutters segments 20, as shown in Fig. 6, are employed in lieu of the segments l8. These segments have a portion forming a part of the bit pin. Another portion 2| integral therewith constitutes a roller cuttersupport adapted to receive a roller cutter 22. In this embodiment the roller cutter 22 is a side cutter.

I'o assemble the bits the two pairs of forgings.

are placed together in a jig in proper relationship and are secured in this position by welding at l9 and also at 23. The pin .portions 10 of the blade carrying segments are formed along their edges with grooves 10a and cut-a-way portions lllb to receive the welding material shown at 59, thus securing a bond between the segments it and I8 or 20 as the case may be. Once the segments have been secured together, suitable threads are: groundupon. the outer-periphery of the pin portions of the assembled bit and the bit isnthen readyrfonusein the conventional manner.

E'romiheforegoinggit will be seen that this invention is -one-well adapted to attain all of the ends andobjects hereinabove set forth, together with"other: advantages, which are obvious and which are inherent to'the structure.

ItLWill be understood that certain features and subcombinati'ons are'of utility and may be employed'rwithoutreferenceto other features and subcombinations; This-is contemplated by and is within the scope of the claims.

Havingdescribedjmy invention, I claim:

19A .rotary drill bit comprising: two pairs of segments joined together and providing a bit with lahollow pinportion' and cutters, the individu'a-l s'egments of :"each pair being: substantially identical' and"'being' arcuately shaped. with their longitudinaliedgesabutting to form a hollow pin, each ofthe segments of one pair. having -a portion making up a part of the pin of the bit and another portion-providing adrag-type bit blade providing acutter; one i of the segments of said pair-also including ax lateral extension having a enclosedpassage communicating with the inte-rior of the'hollowpin for directing drilling fiuid upon-the blade-of said. last segment, the individual segme'nts :of 'the-otherpair providing substantially the remainder'of'the pin.

2; A rotaryv drill. bitucom-prising two pairs of segments joined togethercand providing a-bit with a hollowrpinaportion and cutters, theindividual segments of each pair being substantially identical and:beingarcuatelyshaped with their longitudinalgedgesq abutting to form the hollow pin, each of the segments of one pair having a portion making; up a, part of the pin of the bit and another portion providing a drag-type bit blade providing a, cutter, one of the segments of said pain also including a substantially fiat lateral extensionhavinga concavity therein and an outer edge which, on assembly of the bit, overlies and cooperateswith asurface of the other segment of; saidapairwith said outer edge'abutting the blade? surface of-said other segment to define an enclosed passage communicating with the interior of the hollow pin for directingdrilling fluid tially the remainder of the pin, and having a portion providing a support for a roller cutter, the cutter blade segments having a drillable portion for providing a drilling fluid passage communicating with the interior of the pin.

3. As a subcombination, a bit segment adapted to be made up into and provide a component part of a drag-type bit and combination drag and roller cutter bit, comprising an upper portion arcuate in cross-section and adapted to constitute a part of a bit pin, a cutter blade element formed at the lower portion of the segment, a substantially flat extension on the exterior surfaceofthexsegment below the arcuate upper portion thereof, said extension having a concavity therein and an outer edge, whereby said extension is adapted to overlie and cooperate with the surface of another identical segment with said outer edge abutting the blade surface of said other segment, on assembly, into a bit, to provide anenclosed flush passage for directing drilling fiuiduponacutter blade of abit so formed, said cutter blade portion having an enlargement on and extending from the extension which has a flush passage therein for directing drilling fluid upon a roller cutter on assembly of the segment as a part or" a combination drag and side cutter bit.

l; A rotary drill bit comprising, a pair of segments of identical construction, each segment having its upper portion generally arcuate in transverse section and forminga part ofthe connecting pin of the completed bit and having its lower portion formed as adrag-type bit blade to provide a cutter, each segment also'having an inwardly extending lateral extension which is 1 disposed between the arcuateupper portion and to overlie the blade surface of the othensegment the drag-typeblade portion, with each of said lateral extensions having a concavity therein and an outer edge, each extension being adapted with theouter edge abutting said blade surface of the other-segment when the segments are fitted together whereby the concavity of each lateral extension and the-blade surface whichit overlies form a fluid, passage therebetween, a

pair of segmental sectionsarcuatein cross-section and adapted. to be positioned between the arcuate upper: portions of the segments andcoactingtherewith to complete the annular connecting pin of the bit, and means for connecting thesegments and segmental sections to each other.

5. A. rotary drill bit comprising, apair of segments of identical construction, each, segment having its upper portion generally arcuate in transverse section andforming a part of the connecting pinof the completed bit and having its lower portion formed as a drag-type bit blade to provide a cutter, each segment also having a lateral extension which, is directed inwardly along a plane which is parallel to a plane transversely of the bit and which is disposedbetween the arcuate upper portion and the drag-type blade portion, each lateral extension of one segment havinga groove which is adapted to overlie thelateral extension of the other segment and also being arranged to extend in overlapping relation to the surface of the blade portionof the other segment, the longitudinal edge portion of each extension engaging the surface of the blade portion which it overlies, whereby said lateral extensions provide a reinforcement of the segments and a fluid passage between" each lateral extension and the bladesurface of the other segment when said segments are fitted together, a pair of segmentalsections arcuate in cross-section and adapted to be positioned between the arcuate upper portions of the segments and co-acting therewith to complete the cylindrical connecting pin of the bit, and means for connecting the segments and segmental sections to each other.

6. A rotary drill bit as set forth in claim 4, together with a downwardly directed longitudinal extension of each of the segmental sections, and a roller cutter supported in said extension.

7. A rotary drill bit as set forth in claim 5,

together with an enlargement on the outer surface of each lateral extension having a fluid passage therein, a longitudinal extension on each REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,080,575 Myers Dec. 9, 1913 1,428,137 v Brookhout et a1. Sept. 5, 1922 1,514,415 Arnot Nov. 4, 1924 1,644,142 Metzger et a1 Oct. 4, 1927 1,845,168 McHaley Feb. 16, 1932 1,869,969 Kennedye Aug. 2,1932 1,874,066 Scott et a1. Aug. 30, 1932 1,932,487 Scott Oct. 31, 1933 2,198,849 Waxler Apr. 30, 1940 2,297,157 McClinton Sept. 2'9, 1942 2,321,484 Harrington et a1. June 8, 1943 2,380,112 Kinnear July 10, 1945 2,446,795 Trimble Aug. 10, 1948

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