US1561580A - Drill bit - Google Patents

Description

Nov. 17, 1,561,580

G. R. WATSON DRILL B IT Filed June 19. 1924 V I 6 I I \V/ //I' r \1 w I I. I 5 l 'l' 1U 19 1 I I, I

Inventor.

Watson, 65/

A orne y.

Patented Nov. 17, 1925,

UNITED STATEd PATENT OFFICE.

GEORGE E. WATSON, 0F WATERLOO, IOVIA, ASSIGNOR TO ARMSTRONG MANUFACTUR- ING COMPANY, OF W'ATE RLOO, IOWA.

DRILL BIT.

Application filed June 19, 1924, Serial No. 720,975.

To all "whom it may concern.

Be it known that I, Gnonen R. Carson, a citizen of the United States of America, and a resident of lVaterloo, Black Hawk County, Iowa, have invented certain new and useful Improvements in Drill Bits, of which the following is a specification.

My invention relates to improvements in drill-bits, and the object of my improvement is to supply a bit for a drill such as is used in drilling wells through rock strata, which shall have such a cinnbination of crushing means and cutting means as will cooperate most el'liciently and rapidly in the work of drilling.

This object I have accomplished by the means which are hereinafter described and claimed, and which are illustrated in the ac companying drawings, in which Fig. i is in side elevation of a drill having my improved bit, with part of the drill body broken away, and Fig. 2 is an elevation of the same taken at an angle of ninety degrees to the elevation shown in said Fig. 1. Fig. 3 is a plan of the bit face.

The shank 1 of the drill has a coned and exteriorly threaded boss 2 for intermeshing with a threaded socket in a drill-stem. The body 3 of the drill is of octangular shape in c; section with two opposite faces provided with longitudinal grooves 4 starting from said said shank l and extending down wardly to open through the flat crushing end-face of the bit, the bit-end 5 being of larger diameter than the shank and body of the drill, with cylindrical outer wall having the opposite clefts 9 which are considerably narrower than the grooves a.

The lower en de of the grooves l terminate above the irushing face 5 and the cylindrical wall, thei above in a concave or arcuate anticlinal diametrical ridge TS, whereby the crushing face of the bit is divided into like somewhat crescental halves 5 in the same transverse plane with the middle interspa-ce wider than said side clefts or openings 9. Alined diametrically with the arcuate ridge T8 but below it at either side and extending across the crushing faces 5 are like straight anticlinal cutter ridges 10 having a rather wide angle, The inner ends of these ridges 0 m be n l e as a As the cutter ridges 10 project downwardly from the flat crushing faces they chop up the rock at the bottom of the drill-hole as the drill rises and is dropped and then the crushing faces 5 crush and reduce to powder the detached fragments of rock most ellicicntly as none can. escape in any way or direction, because the widened end of the bit nearly fits the bore of the drill-hole. As the part 5 has a cylindrical outer wall which interrupted on opposite sides only by the relativelynarrow clefts 9, the edges of the latter may ream out the hole cylindrically, the clefts not being wide enough to stall or shape flat places in the wall of the hole. The side grooves 4; are of ample size to hold and convey sufficient water to the bottom of the here about the bit, while the arcuate cutter 7-8 breaks up the rocky cone all the time forming in the bottom of the drill-hole.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is:

l. A drill-bit having a flat crushingface, and having side grooves terminating above said crushing-face in an arcuate anticlinal ridge, and said crushing-face having anticlinal ridges extending across it.

2. A drillbit having a flat crushing-face and a pair of ridges thereon in diametrical alinement with their inner ends spaced apart, the crushing-face having an opening extending diametrically across it and separating said ridges medially and transversely to provide thereloetween a concave anticlinal cutter.

3. A drill-loit whose body is terminally widened to provide a like pair of substantially crescental reamers with a fiat crushing face, whose interspace is bridged by a din" metrically positioned upwardly arcuate antiolinal ridge, said body having 011 opposite sides longitudinal grooves terminating below at said arcuate ridge, with the end interspaces of the crescental parts narrower than said grooves to prevent the drill from form ing flat spots in the wall of a dr1ll-hole.

Signed at "Waterloo, Iowa, this 15th day of May, 1924.

GEORGE E. WATSON,

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