US1547842A - Fishtail bit - Google Patents

Description

July 28,' 1925. 1542842 I W. F. STOODY ET AL FISHTAIL BIT Filed Aug. 31, 1923 Iuvnnrorgs Jelley 00 Ch r N18100:!" W AZ LL- 1' Patented July 1-28 1925.

. I sTATEs WINSTON I. STOODY, SHELLEY M. STOOD Y,

- CALIFORNIA.

AND cmnnns a mailman. BIT.

Application filed August 31, 1923. Serial No. 660,388.

To all whom it may concern:

Be it known that we, WINSTON F. STOODY, SHELLEY M. Scroonr, and .GHARLEs H. STOODY, citizens of the-United States, residing at Whittier, in the county of I os Angel'es and State of Califorma, have invented new and useful Improvements in Fishtail Bits, of which the-following is a specification. i

This invention relates to fishtail b1ts.

An object of the present invention is to provide a fishtail bit having the usual substantially flat body and being provided on the corners of its cutting end with forwardly projecting and longitudinally extending thickening ridges or wings which are formed on the forward side of the corners as to direction of rotation of the bit.

An important object is to provide a fishtail bit having the longitudinal edges of its cutting corners so thickened from front to back or built up, as it were, as to provide a very materially increased longitudinal edge which is ordinarily subjected to a reaming action and therefore causes the flat body to wear away to a heel-like or rounded corner. An advantage of thepresent invention is that by relatively thickening the longitudinal edges of the corners of the bit, the life of the corners is very greatly increased, and from actual practice and use of the invention in drilling deep wells it isfound that instead of the corners rounding OH or heeling, the lower ends of the bit out substantially on a straight, transverse line from the original end face back to the terminus of the built up or widened edges.

Other objects and advantages will be made manifest in the following specification of embodiments of the invention illustrated in the accompanying drawings, wherein:

Figure 1.is a side elevation of the improved bit.

Fig. 2 is an edge view of the bit. Fig. Bis a cross section on line 83 of Fi ure 1. j

ig. 4 is a side elevation of another form of the bit.

Fig, 5 is a cross section on line 55 of Fi re 4. g

ig. 6 is an edge view of a form of the ed e with the wing. V

ig. 7 shows diagrammatically the building up, by welding, of an edge Wing.

of the usual flat The bit of the resent invention consists ody 2 having a head 3 s'roomnor wn'rrmna;

with a threaded 'pin 4. The lower end of the blade2 may be continuous 'or somewhat bifurcated, as at 5, and the lower, transverse end of the blade is provided with inwardly convergent cutting edges 66. v An important feature of the present tool conslsts of forwardly projecting ridges 8 exedges of the wings, as in Figure 4.

. Most forms of fishtail bits have the lower corners bent or struck forwardly as indicated by the dotted line 12 in Figures 2 and 6,

and in Figure 2 the edge widening wing 8 is shown as projecting at 8 beyond the 11p or end edge 6 of the blade, while in Figure 6 the widening wing edge terminates at its lower end at the edge 6. Figures 2 and 6, therefore, show simply different forms of widenlng wmgs.

he direct advantage of the edge widening wings 8 is that the reaming edges 9 of the tool are very materially'widened and therefore have a greater length of life as well also asincreasing the reaming action of the longitudinal edges of the tool. It has been found from actual use of the win ed edged tool that the cutting edges 6 as tiey wear do not round off at the corners of the blade but'continuously wear back on a line tending along the longitudinal edges of the which is substantially perpendicular to the axis of the bit, and therefore the bit presents a straight, transverse,.cutting bottom edge back tothe. upper ends of the wings 8 and all heeling or rounding tendency of the corners is'wholly overcome.

By our methed, fishtail tools may be formed in the'origmal process of manufacture by forging the wings 8 integrally with the blade, or in other cases finished bits of ordinary type may be provided with built up wings 8, as in Figure 7, by fusing and welding onto the front of the corners of the blade 'a high-grade steel stock as from a pencil 13 of steel which becomes thoroughly bonded with the blade 2 and can be built up to any desired length and width and cross section, a referred forin of which is shown Y in Figure A welding torch T is indicated in Figure 7 as showin ma be fused and wel ed onto the blade he present, invention, therefore, consists broadly in forming on or building up upon the cutting corners or edges of blts cutting portions which may be built on worn bits or bits of standard construction by fusing or welding.

By providing the lower portions of the longitudinal edges of the fish tail bit with widened cutting win s, the wear thereon is minimized,- and the sh tail bit will retain the same width indefinitely, making it unnecessary to follow u the drilling operation with a reamer to en arge the hole drilled.

Such reaming operation is necessary with the use of the ordlnary in 1ts use becomes quickly worn and prehow the pencil stock fish tail bit, which sents a smaller width, making the use of the reamer necessary.

F urther embodiments, modifications and variations may be resorted to within the principle of the invention.

What is claimed is: a

A fish tail drill bit having a downwardly cutting ed e and longitudina edges aving the cutting corners of the lower portions "of said edges provided with forwardly widened cutting wings, the outer faces of said wings'mergin with the longitudinal edges of the bit and being concentric to the longitudinal axis of the bit.

In testimony whereof we have signed our names to this specification.

WINSTON F. STOODY. SHELLEY M. STOODY. CHARLES H. STOODY.v

provided with parallel

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