US1326507A - Combination drill-bit and drill-shank. - Google Patents

Description

G. A. HUMASON.

COMBINATION DRILL BIT AND DRILL SHANK.

APPLICATION FILED MAR 19. I918.

Patented Dec. 30, 1919.

UNITED STATES PATENT oEEIoE.

GRANVILLE A. HUMASON, OF SHREVEPORT, LOUISIANA, ASSIGNOR 0F ONE-THIRD TO EDWARD B. BIERCE AND ONE-THIRD T0 JOHN W. PARKER, BOTH OF HARRIS COUNTY,

TEXAS.

COMBINATION DRILL-BIT 1 AND DRILL-SHANK.

To all whom it may concern:

Be it known that I, GRANVILLE A. HUMA- SON, a citizen of the United States, residing at Shreveport, in the parish of Caddo and State of Louisiana, have invented certain new and useful Improvements in Combination Drill-Bits and Drill-Shanks, of which the following is a specification.

This invention relates to new and useful improvements in the combination drill bit and drill shank.

The object of the invention is to provide a drill bit in combination with a drill shank by means of which the bit may be securely attached to a drill stem, in such a manner as to prevent the detachment of the bit from the stem while down in the bore.

In drilling wells by the rotary process, a drill stem is employed which is rotated by the rotary and to the lower end of which a bit is attached through the medium of a drill shank. As now constructed, the lower end of the stem is threaded into the upper end of the drill shank and the shank of the bit is threaded into the lower end of the drill shank. In drilling through hard strata, the threads of the bit shank and the corresponding threads of the drill shank are subjected to great strain, and furthermore the bit must be often removed and sharpened and replaced, consequently said threads soon become battered and worn, so that the bit he comes loose in the drill shank and when the 'stem is rotated backwardly, or when it is being pulled from the bore, the bit often drops ofi and remains in the bottom of the bore, thus interfering with and sometimes entirely stopping the process of drilling.

It is the object of this invention to provide a drill shank and means for securing the bit thereto wherebysaid bit will be securely fastened to the stem, and there will be no liability of its becoming detached therefrom.

With the above and other objects in view, the invention has particular relation to cer tain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawin s, wherein Figure 1,- 1s a side elevation of a drill shown partially in section, taken on the line 1 -'1 of Fig. 3.

Specification of Letters Patent.

Patented Dec. 30, 1919.

Application filed March 19, 1918. Serial No. 223,318.

Fig. 2, is a fragmentary side elevation thereof,

Fig. 3, is a transverse sectional view taken on the line 3-3 of Fig. 2,

Fig. 4, is a side view of a detachable blade employed and Fig. 5 is a section on the line 5-5 of Fig. 1.

Referring now more particularly to the drawings wherein like numerals of reference designate similar parts in each of the figures, the numeral 1, refers to a drill stem, the lower end of which is threaded into the upper end of the drill shank 2. The lower end of this shank is enlarged forming the annular shoulder 3, and the enlarged head 4, said head being provided with a transverse tapering mortise 5. The numeral 6 refers to a sleeve which is fitted over the drill shank 2, the upper end of which is reduced,

forming an internal annular rim 7, which rests upon the shoulder 3. The numeral 8 refers to a drill bit having the externally threaded shank 9, which is screwed into the lower end of said sleeve. The sleeve proj ects a sufiicient distance below the head 4 to permit this. Integral with and upstanding from, the shank, is a wedge shaped tenon 10, which fits into the mortise 5 and locks the bit against rotation relative to the shank.

In assembling the bit and shank, the tenon 10 is inserted up into the mortise 5, and the sleeve 6, then fitted over said shank and screwed onto the shank 9 of the bit,

and the flange 7 seats on the shoulder 3.

The ordinary fish-tailed bit, usually has I only two blades, but additional blades may be provided when it is so desired. In the drawing, the detachable blades 11 are shown. These blades are fitted into the vertical'side slots 12, of the bit, and the-shank sections thereof, are provided with threads 13, to correspond with the threads of the shank 9. These blades 11 are provided with tenons 14 corresponding in shape to the tenon 10 of the bit, and which fit into the radiating mortises 15, of the head 1 and corresponding slots in the shank 9. When the detachable blades 11 are used, they are fitted into position before the sleeve 6 is screwed in place, and the said sleeve is then screwed over the u per ends thereof, and they are thereby loc ed securely in the grooves 12. In case of hard drilling, should the tenons 10 and 14 become broken ofi', the sleeve 6 will still secure the bit against detachment from the shank 2, so that there will be no liability of said bit becoming lost in the bore.

Water passageways 16, 16 are provided down through the shank 2, and through the tenon, fitted into said mortise, said bit eeaaov having opposing vertical grooves and said shank being provided with lateral mortises alined with said grooves, detachable blades 'fitted into said grooves and whose upper ends are formed into tenons which fit into said alined mortises, and a sleeve fitted over said shank and secured onto said bit, said sleeve locking said tenons in their. respective mortises.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GRANVILLE A. HUMASON; Witnesses:

E.V. HARDWAY, E. B. BIERCE.

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