US1491876A - Drill bit - Google Patents

Description

April 29 1924,

" G. w. NELY DRILL BIT Filed Aug. 9. 1925 Patented Apr. 29, 1924.

UNITED STATES iaititdiii GEORGE W. NEELY, 0F SANTA ANA, CALJIEORNIA.

DRILL BIT.

Application filed August 9, 1923.

To all Iwhom it may concern:

Be it known that I, GEORGE l/V. NnnLY, a citizen of 'the United States, residing at Santa Ana, in the county of Orange and State ot' California, have invented certain new and useful Improvements in Drill Bits, of which the following is a specification.

This invention relates to bits tor use in machinery for boring deep wells. vWith bits as heretofore constructed, loss ol? bits and great damage to the boring' apparatus has been frequently caused by the bit striking a crevice in the rock and becoming jammed in the crevice so that it is twisted or broken from the drill tube or other supporting and driving elements, and it has been necessary frequently to abandon wells after they have been driven to great depth by reason of the inability to recover the broken bit and thereby clear the well. Even Awhen the broken bit has been recovered, considerable expense has been occasioned and time has been lost in the operation of fishing for the broken bit to remove the same from the well. It is the object of my invention to provide a bit of such construction that, if a crevice in the rock should be encountered, the bit will not become jammed therein but will at once ride out ot the crevice so that the entire boring line will be raised and the operator at the mouth oi' the well will be notified ci' the con dition. The boring tool may then be simply withdrawn and the usual means resorted to for clearing away the obstructing portion of the rock so that the drilling1 may proceed. One embodiment of my invention is illustrated in the accompanying drawing, and the invention resides in certain novel features which will be particularly pointed out in the appended claims.

In the drawings:

Figure l is an elevation of a bit constructed in accordance with my invention and showingl the same as engaged in a crevice in the roc-k and also showingr by dotted lines the position of. the bit after it rides out of the crevice;

Fig. 2 is a front elevation of the bit;

Fig. 3 is a bottom plan view, and

Serial No. 656,572.

Fig. a is a detail section on the line 4 4.- oi Fig.

The bit comprises a shank l which may be of any preferred form whereby it may be engaged in the drilling tube or other driving member in the usual manner. it the lower end of the shank l is a head 2 having a sharpened lower cutting edge 3 and having the usual openings et formed therethrough for the flow of iushingi,l water. The ends oi' the head are disposed obliquely relative to the downwardly converging races of the head and at one end of each tace a guide lip 5 projects from the face in alinement with the end surface of the bit, as shown clearly in Fig. 3. The guide lips are disposed at opposite ends oi' the bit so that each lip will run in advance oi the tace from which it projects when the tool is rotated. The forward edge of each" lip is curved, as shown at 6, so that it presents a cam surface which, upon striking the edge of a crevice in the rock, as shown at 7, will cause the bit to ride upwardly out ci the crevice, and this upward movement oi the bit will be transmitted to and through the entire driving line.

By referring,- to Fig. l, it will be readily noted that the curved edge 6 of the bit constitutes a cam which tends at once to ride upon the wall of the crevice and divert and reverse the axial travel of the bit, whereas with the usual construction off bit, when a crevice is encountered, the cutting end of the bit will simply drop into the crevice and become wedged therein so that an attempt to continue the rotation of the bit will simply break the shank of the same and jam the operating* mechanism with resulting damage as hereinbefore mentioned.

My improved bit is exceedingly simpie in its construction and may be produced at a cost very little, if any, greater than the ordinary bits now generally employed. The saving of time and of machinery due to its use will more than oit-set any additional cost which may be involved in its manufacture. n

Y It is to be understood that my improvement may be applied to any form of bit employed in boring oil wells.

Having thus described the invention, what is claimed as new is:

1. A bit for deep wells comprising a cutting head provided at its opposite ends upon its opposite sides with forwardly projecting cam guide lips.

2. A rotary drill bit for deep wells comprising a Cutting head provided at its ends upon its opposite sides with forwardly projeoting guide lips having their vertical edges curvedto present cam faces.

In testimony whereof I afix my signature.

GEORGE w. NEELY. [a 8.]

Images