US1734469A - Drill bit - Google Patents

Description

1929- w. o. JOURNEAY DRILL BI'I' Filed Sept. 16, 1925 2 Sheets-Sheet 2 Patented Nov. 5, 1929 WILLIAM O. JOURNEAY, OF HOUSTON, TEXAS; JAMES JOURNEAY ADMINISTRATOR OF SAID WILLIAM O. J'OURNEAY, DECEASED DRILL IBIT Application filed September 16, 1925. Serial No. 56,619.

This invention relates to new and useful improvements in drill bits, and more particularly to that class of drill bits adapted for use in deep well drilling.

One object of this invention is to provide a drill bit which will drill a straight hole and ream the sides of the hole as the drilling progresses.

Another object of the invention is to provide the head of the bit with' removable blades. 1

Another object of the invention is to provide means for cutting a Way backward in case a boulder should fall in on top of the bit, or in case of the wall caving in, or bridging.

lVith the above and other objects in view this invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is illustrated in the accompanying drawings and described and claimed in this specification, wherein z- Figure 1 shows a vertical sectional view of the bit, taken on the line 11 of Figure 3.

Figure 2 is a cross sectional view taken on the line 9-2 of Figure 1.

Figure 3 is a cross sectional view of the bit 7 taken on the line 3-3 of Figure 1.

Figure 4: shows a bottom end view of the bit. partly in section.

Figure 5 is a fragmentary longitudinal sectional view of the bit illustrating the method of holding the bit blades in the bit head.

Figure 6 is a view of the type of bolt used in holding the blades in the bit, while Figure 7 is an end view of the head of the bolt showing the recess in which a suitable wrench may be applied when screwing or unscrewing the bolt.

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 the bit head as a whole, which in general contour is cylindrical, having, however, the longitudinally extending grooves 2, and, also the longitudinal grooves 3 in which the elongated blades 4 are seated. These grooves are slightly tapered inwardly toward the axis of the head and the blades are held against removal by the bolts 5, all of which pass through the shoulders 6 and 7 which form the grooves 2, except the top some further than others so that the bottom of the hole will be cut out. The bottom edges of the blades taper slightly upwardly, thus causing the bit to center better than it these edges were straight across. The shoulders of the blades are seated in grooves in the bottom of the head and are thus braced against twisting oif.

Secured in the grooves in the top 9 of the head are the blades or cutters 10, substantially triangular in shape, the upper edges of which are forwardly inclined and sharpened so that if a boulder should fall on top of the bit in course of drilling, or it the hole should cave in above the drill the drill pipe may be raised, held under constant tension, and rotated and the boulder ground to pieces or-the caved in portion cut through in this manner. A suitable collar 11 is screwed down upon the bit head and is held by the lugs carried by the blades in rigid position on the head 1. The blades in turn are held rigid by the shoulders of the head and bolts 12.

The particular type of bolts used in bolding the blades in position are found to be of "alue since they may be removed easily by the use of a special wrench being inserted in the socket 13 in the head of said bolt and if desired a screwdriver may be used in the small securing said or advance end thereof to assist in removing the bolt should the same become too tight to be removed easily by the use of the wrench alone. Suitable water courses '14: have been provided for flushing the cuttings and washing the bit points.

The blades may be easily removed to be sharpened or for the purpose of inserting new oneswhere needed.

This type of bit is easily made and assembled or disassembled and is cheaply constructed.

What I claim is 1. A drill bit comprising a head having external grooves extending longitudinally thereof from end to end thereof and whose lower ends extend radially across the bottom of the head, cutting blades seated in said grooves and projecting beyond the lower end of said head and shoulders carriedby said blades which project under the head some further than others, said shoulders being seated in the radial end grooves, means for bracing said projecting portions of said blades and bolts spaced along said blades and blades in said grooves.

2. A drill bit comprisin a head having grooves extending longitudinally from end to end thereof in the outer side of said head, cuttin blades seated in said grooves and coextensive therewith and projecting beyond the lower end of said head and a shoulder carried by each blade which projects under the head, some of said shoulders projecting further than others, and which seat in said grooves, said shoulders projecting toward the center axis of the head and bolts securing sai blades in said grooves, other blades upon the upper end of said head seated in grooves in the head and having their upper edges sharpened.

3. A drill bit comprising a head having external grooves spaced apart therearound and extending from end to end thereof blades seated in said grooves and extending from the upper end of the head to the lower end thereof said blades extending beneath the lower end of the head, the upper and lower ends of the head having radial grooves aligned with said longitudinal grooves, said extensions extending inwardly and being seated in said lower end grooves, blades seated in said up per end grooves having upper cutting edges which diverge downwardly.

4. A drill bit comprising a hen naving external longitudinal grooves extending from end to end thereof, the upper and lower ends of the head having radial grooves aligned with the corresponding longitudinal grooves, blades seated in said longitudinal groowes which extend beneath the head, and are widened inwardly and seated in said radial grooves at the lower end of the head. blades seated in said radial grooves at the upper end of the head whose u pper edge are formed into sharp cutting edges, the upper end of the head being reduced to form an external annular shoulder said blades at the upper end of the head extending inwardly and a collar screwed onto the reduced portion of the head and clamping said inwardly extending portions of said blades between said collar and shoulder.

In testimony whereof I name. to this specification.

WILLIAM O. J OURNEAY.

have signed my

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