US1523253A - Drill-bit construction - Google Patents

Description

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J. J. BROSSOIT DRILL BIT CONSTRUCTION Filed June 17, 1922 n mm m5 ..5 V WM m m 71MB m WITNESSES 5 fi/ 1w.

JAMES JOSEPH BROSSOIT, OF SALT LAKE CITY, UTAH.

DRILL-BIT CONSTRUCTION.

Application filed June 17, 1922. Serial No. 568,900.

To all whom "it may concern.

Be it known that I, JAMES J. Bnossorr, a citizen of the United States, and a resident of Salt Lake City, in the county of Salt Lake and State of Utah, have invented a new and Improved Drill-Bit Construction, of which the following is a full,. clear, and exact description.

This invention relates to a drill bit construction, and has for an object the provision of means whereby a drill bit can be very easily, quickly and firmly inserted in a suitable socket in a drill shank and is so constructed that it can be quickly and readily removed.

Another object resides in the provision of means whereby the shocks to which the bit is subjected are distributed over the surface of engagement of the bit with the shank, rather than concentrated at any one point.

A further object resides in the provision of a drill bit having a stem of irregular cross section so associated with a socket that it has no tendency to rotate during drilling.

A still further object resides in the particular construction and arrangement of parts which are hereinafter described and claimed and shown in the accompanying drawings.

The invention is illustrated in the drawin s, in whichigure 1 is a side elevation of the shank of the drill and the bit showing a portion of the shank in section.

. Fig. 2 is a side elevation of the same portion of the unit taken at right angles to the showing in Fig. 1. v

Fig. 3 is an inverted plan view.

Fig. 1 is a side'elevation of a modified form of the device.

-xFig. 5 is an inverted plan view of the modification shown in Fig. 4. i Fig. 6 is a plan view of a tool for removing the bit from the drill shank.

The forms of the invention shown in the drawings are preferred forms, although it is understood that modifications in the construction and arrangement of the parts and in the character of the materials used ma be adopted without departing from the spirit of the invention.

The preferred form of the invention comprises a drill 1 having a shank 2 in which is provided a socket 3. This socket inone plane, as viewed in Fig. 1, has tapered walls 4 and 5; but in a plane atright angles therea groove 9 which ma to, as shown in Fig. 2, the walls 6 and 7 are parallel. In this socket 3 the 5118111, 8 of a bit is adapted to be introduced. This stem, correspondingly, is tapered along two opposite walls, and the other two opposite walls are parallel so that the stem fits in the socket. The length of'the stem 8, however, is not as great as the depth of the socket, so that the bottom of the socket receives no shock from the blows transmitted through the bit. The entire force of contact, therefore, is taken up along the sides of the socket, whereby the force is more evenly distributed.

A groove 9 is formed in the side of the bit and extends from the top tothe bot-tom, whereby the circulatin water may flow from the circulating channel or passage 10 through to the surface of the bit. The lower end of the bit is enlarged, as at 11, and has a cut; ting. edge 12. The head portion 11 has curved tapered shoulders 13 and 14 connecting it with the stem 8, and these shoulders are spaced apart from the lower edges 15 and 16 of the drill shank. These shoulders are formed at opposite sides of the bit and the spaces between them and the shank are adapted to receive prongs 17 and 18 formed and spaced apart on the end of a tool 19. These prongs are tapered, and when they are gradually forced into the spaces between the shoulders 13 and 14 and the lower edges of the shank, will tend to force the wedge or drill bit out of the socket 3. The sides of the bit at right angles to the shoulders 13 and 14 are strengthened by abutting dependent shoulders 20 and 21 of the drill shank which extends below the edges 15 and 16.

In the modification shown in Figs. 4: and 5, the same ideas are involved with the exception that a four-point bit 12 is used instead of a two-point bit.

I have, therefore, provided a simple and eflicient drill and bit in which the bit can be very quickly and easily applied to and removed from the drill; in which the shock on the bit is absorbed uniformly throughout the surface of contact of the bit with the drill; and in which the construction insures a strong, compact device.

With reference to Figures 1 and 2 it will be seen that the stem or attaching portion 8 of the bit has one side wall formed with be economicall formed or rovided in t e stem and which forms an e cient means for conducting the water supplied by the passage 10. It will be-seen that the side of the stem having the longitudinal groove 9 bears flatly in contact with the adjacent wall of the socket and C011. sequently the stem and the wall of the socket cooperate to define a passage through which the liquid must pass. One of the most important features of the invention is the fact that one of the depending reinforcing members and more particularly the member 20 is flatly engaged with the head of the bit and extends over the forward portion of the groove so that the water-conveyed by ,,the groove is discharged at the working faces of the tool. By thus discharging the water at the working faces of the tool the efficient and expeditious operation of the device is provided for. As is well knowna groove may be formed in the stem much more eco nomically than an enclosed channel may be provided. I

What I claim is:

1. A drill comprising a body having a socket and a water passage opening into the socket, and a bit having a stcnrrec'cived in said socket and having one side wall flatly contacting with the adjacent wall of the socket and formed with a longitudinal water conveying groove, said h'ead having one side formed with a continuation of said groove,

the forward portion of said body being formed with depending reinforcing members flatly engaging opposite sides of said head, one of said depending reinforcing members being extended over the forward portion of said groove whereby the liquid is discharged out through the forward end of said 7 bers flatly engaging opposite sides of said head, one of said depending reinforcward portion of said groove whereby the liquid is discharged out through the forward end of said head at the working surfaces of the same, said socket and said shank being rovided with oppositely arranged paralle side walls and with opposite inclined walls JAMES JOSEPH BROSSOIT.

ing members being extended over the for- 5

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