US1568372A - Hand tool for forming bit wings - Google Patents

Description

Jan. 5 1926. 1,568,372

M. T. FLANAGAN HAND TOOL FOR FORMING BIT WINGS Filed Dec; 5. 1924 2 I 2 INVENTOR BY gag/1% Anonfav Patented Jan. 5, 1926.

UNITED STATES PATENT OFFICE.

HAND TOOL FOR FORMING BIT WINGS.

Application filed December 3, 1924. Serial No. 753,686.

To all whom it may concern:

Be it known that I, MALCOLM T. FLANA- GAN,a citizen of the United States, residing at Spokane, in the county of Spokane and State of Washington, have invented new and useful Improvements in Hand Tools for Forming Bit Wings, of which the following is a specification.

This invention relates to a novel means of manually forming the bit wings on the swelled end of a drill steel.

For some time, large machines, of a very expensive type, have been in use for forming cruciform bits on drill steel but these machines are only available with relatively large operations. In small operations, butts are. formed by a blacksmith with what is called a hot cutter, which is a chisel-like implement, with which the stock of the swelled end is cut away to form the bit wings. In this old operation, it was necessary to form each face of each wing, separately, and if there were four wings, as in the usual cruciform bit, then eight forming steps were necessary. Further, it was very difficult to form or cut away uniformly between the wings, in forming the same, hence, the lower portions of some wings would be thicker and stronger than others, and the weaker ones would frequently be broke off in drilling the harder formations. A very frequent and troublesome defect encountered in the use of the hot cutter, consisted in nicking or otherwise accidently cutting a previously finished face of a wing when completing the next adjacent face thereto. This would leave a water check in the nicked wing, when the bit was immersed in water, thereby making such wing frail and easily broken in hard formation.

It is one of the primary objects of my invention to form two adjacent faces of two adjacent wings, in one step.

Heretofore, with the large bit forming machines, the metal was, and is, crushed at points between .the bit wings, to form the latter, and such metal is not cut away.

In accordance with my improved device, the metal of the swelled. end of the drill steel is actually cut-away to form the wings,

obtain wings of uniform thickness. This latter feature is also due to a novel arrange ment of the cutting portions of the tool.

My invention has many other features and objects which will be more fully described in connection with the accompanying draw-- ing and which will be more particularly pointed out in and by the appended claims.

In the drawing Fig. 1, is a view in side elevation of a drill steel of the usual hexagonal cross section.

Fig. 2, is a similar view after the end has been upset or swelled to provide stock enough in which to form the bit wings.

F ig. 3, is a view after the bit wings have been formed looking at one of the flat sides of the steel, or in other words, with a flat side nearest to the eye viewing the object.

Fig. 4, is a similar view with a corner of the steel nearest the person viewing the object.

Fig. 5, is a plan view of the finished bit.

Fig. 6, is a plan view of the improved tool employed for forming the bit wings.

Fig. 7 is a sectional view on line 7-7 of Fig. 6.

Fig. 8, is a bottom plan view of the tool.

Fig. 9, is a view of the drill steel showing a few of the different positions the tool would assume in cutting one groove to form the adjacent faces of two adjacent wings.

Fig. 10, is a sectional view on line l0-10 of Fig. 6.

Fig. 11, is a sectional view on line ll11 of Fig. 6.

Like characters of reference designate similar parts throughout the different figures of the drawing.

To facilitate a clear understanding of the purpose of the invention, I have illustrated the steps in forming a bit on a drill steel, and while I have shown hexagonal steel, it will be understood that my invention is adapted for steel of other polygonal cross section and also for cylindrical steel.

The steel 1, in Fig. 1. is shown before the end 2 has been swelled, and in Fig. 2, the end 2 has been swelled as indicated at 3,

This step provides suflicient stock in which to form the bit wmgs, as 15 well known. In Figs. 3 and l, I have shown the bit wings l,

fully formed, and it may be assumed that they have been sharpened by the usual dolly, although this i immaterial to an understanding of the invention. One important feature shown in these figures is that the grooves in Fig. 3, are shown started at 5, in the lateral centers of the flats 6, whereas, the groove shown in Fig. l, which is indicated at 7, is shown started in alineinent with a corner 8, of the steel. I employ polygonal portions of the steel, to indicate or aline the starting positions of the tool, so that the resulting wings will be in uniform and symmetrical spacedrelation. I have indicated the bore 9, of drill steel of this character, as it would usually appear.

Reference will next be made to my iinproved tool, as shown more particularly in Figs. 6 to 8.

As shown, 10 generally indicates my improved tool, and the same is provided with an anvil portion 11 of a relatively great cross section and weight. This anvil portion has a hammer face 12, against which the maul, in the hands of the assistant, is applied to cause the tool to cut the hot steel, as will later appear. Said anvil por tion is also provided with a handle opening 18, in which a handle 1%, is inserted, which is held by the blacksmith. Projecting from the anvil portion 11,is a bill 15, which, as seen in Fig. 7, is disposed almost wholly on one side of a line intersecting the longitudinal center of the anvil body portion 11. In thickness this bill 15, is of greatly reduced weight and cross section with respect to the anvil portion 11, and the billteiniinates in converging or V-shap'ed cutting ends 16. The V-sha ped cutting ends 16 slant upwardly from the beak-like apex 22, toward the anvil end 12. and obliquely to the plane of bottom 19. The'upper face of the bill is truly V-shaped at 17, toward its approach to the ends 16, and thereafter, said face merges into a substantially fiat face, as indicated at 18. The bottom face 19, of the bill, is substantially flat, fora portion of its length, as shown in Fig. 7, and is thereafter curved upwardly as sliown at 20. This curved shaping portion extends downwardly at 21 and merges into the rear portion of a beak-like apex-22, which is the point of convergence of the V shaped cut ting ends 16 and which lies below the plane of bottom 19. It will be noted that this apex 22, has a short linear V edge stool: so that as the ends-16 are successively sharpened, the beak-like protuberance will not be worn to a point.

The tool, near the cutting ends, has substantially seaplane sides 23, which merge into the bottom "and lateral sides of the bill as clearly shown in Figs. 7 and 8. The curved lines of juncture of this 'mergence are indicated at 2 l,'in Fig. 8.

I will next describe the operation of my invention.

With the steel properly held, the blacksmith will, in one instance, locate the apex 22 at the base 25, of the swell, and in alinement with corner 8, of the steel, as shown at A, in dotted lines in Fig. 9. The assistant will strike tle face 12, with a maul, not shown, and successively as the tool begins to cut, it will be shifted by the blacksmith to position B. The curved line 26, shows that the direction of cut will be from peripheral point 27, inwardly and longitudinally of the steel toward the axis at 28. Thus,the angle of disposition of the tool will at all times be more nearly longitudinally of the steel thanat right angles to the longitudinal axis thereof. it will now be clear, that when the tool has cut its way to point 28, it will, in one cutting step or phase of the process, have finished off two adjacent faces of two adjacent wings. The tool will next be applied to the center of a flat, as indicated at 5, and the same operation will again be carried out. The next cut will be at the corner diametrically opposite corner 8. The result will be four wings 4, in the cruci form contour shown in Fig. 5.

It will be understood that after the wings have been formed, by my improved device,

the subsequent gauging and also, the sharpening by the dolly, will be carried out as is now the practice, and that my invention has to do wholly with the formation of the bit wings in the heated swelled end 3.

I claim 1. A hand tool for forming bit wings on the swelled endof a hot drillsteel,comprising, a tool body having an elongated bill provided with V-shaped cuttingends having a downwardly extending beak-like apex, the upper face of said bill being V-shaped'rean wardly from saidcutting ends for a portion of the length of said bill, the lower face of said bill being substantially flat and convergin'gon curved lines from its-lateral sides toward and also curving downwardly and merging into said apex,tlie side portions'adjacent said V-shaped cuttingends being substantially flat and extending b'ackwardly from said cutting ends and merging into said sides andbottom of said bill.

2. A hand tool for forming bit wings on the heated swelled end of a drill steel comprisin a tool body h'avinga substantially flat bottom and provided with an elongated bill, said bill having V-shaped cutting ends converging into a'bealr-like apex, and said apex being disposed below the plane of said bottom.

3. A hand tool for forming bit wings on the heated swelled end of a drill steel'conr prising, tool body havinga substantially flat bottom and provided with a bill having converging cutting ends, said cutting ends slanting rearwardly and upwardly from their point of convergence toward said body and obliquely to the plane of said flat bottom.

4. A hand tool for forming bit wings on the heated swelled end of a drill Steel comprising, a tool body having a bottom and a projecting bill, said bill having V-shaped cutting ends converging to a beak-like apex disposed below said bottom and having a 10 rearwardly extending linear edge, the bottom of said bill having a curved shaping portion "extending downwardly below said body bottom and merging into said apex and linear edge.

In testimony that I claim the foregoing as my own, I hereby aifix my signature.

MALCOLM T. FLANAGAN.

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