US1493439A - Reversible spur for auger bits - Google Patents

Description

May 6, 1924. s. D. STEADMAN REVERSIBLE SPUR FOR AUGER BITS Filed Feb. 13. 1923 9S. 7 I Snow/misc Patented May 6, 1924.

UNITED STATES.

STEPHEN I). STEADMAN, OF SOUT HINGTON, CONNECTICUT.

REVERSIBLE SPUR FOR AUGER. BITS.

Application filed February 13, 1923. Serial No. 618,780.

To all whom it may concern: v

Be it known that I, STEPHEN D. STEAD- MAN, a citizen of the United States, residing at Southington, in the county of Hartford and State of Connecticut, have invented cer tain new and useful Improvements in Reversible Spurs for Auger Bits, of which the following is a specification.

The primary object of my invention resides in the provision of a reversible spur for auger bits and especially the single twist type of auger, wherein the said spur is provided with a pair of cutting edges, the same being well adapted for ready attachment to or detachment from the auger for permitting either of the cutting edges of the spur to be used.

WVith the above recited objects in view,

and others of a similar nature, the inven-l tion resides in the construction, combina tion and arrangement of parts set forth in and falling within the scope of the appended claim.

In the accompanying drawings:

Figure 1 is an elevational View of a single twist type of auger bit with which is associ ated my reversible spur.

Figure 2 is a bottom plan view of this bit, and

Figure 3 is an enlarged perspective of the bit per se.

Referring to the drawing in detail, the numeral 5 designates a single twist anger bit of conventional type, the same consisting of the usual shank 6 and twist 7.

In adapting this type of bit for the reception of my reversible spur, the said twist 7 is formed with a vertical dove-tailed groove or slot 8 directly opposite of the cutting end of the said twist 7. My reversible spur 9 consists of a block of high speed tool steel, the opposite ends thereof being formed with cutting edges 10. The inner face of the said spur 9 is dove-tailed as at 11 and is adapted groove 8 in the twist 7 of the auger bit. This spur 9 is formed with a center opening. 12 through which is adapted to pass a set screw 13 the screw threaded end of this screw befor insertion into the said dove-tailed slot or ing received within a screw threaded opening in the twist 7 in a mannermore shown in Figure 2.

In View of the above description, it will at once be apparent that should one cutting edge of my spur become fdull .or chipped the said spur may be removed from the auger and the opposite end be employed as the cutter.

I have entered into a detailed description of the construction embraced in the present and preferred embodiment of my invention with a view to imparting a full, clear and exact understanding of the said embodiment; I do not desire, however, to be understood as confining myself to the said specific construction and relative arrangement of parts, inasmuch as in the future practice of my invention such changes or modifications may be made as fairly fall within the scope of my invention as defined by my appended claim.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is The combination with an anger bit having a'shank and a twist extending therefrom formed with a recess inthe lower end (por tion having dove-tailed side walls, of a reversible. spur having cutting edges at each end and dove-tailed side walls, said s ur being formed with a central opening for the reception ofa screw adapted for threaded co-operation with an opening formed in the twist at the recessed portion thereof for removably securing'the spur within the re cessed portion, whereby one end will project below the lower end portion of the twist for cutting co-operation in connection with the bit, and the remainder of the spur will be completely housed within the recess in the twist, the outer surface of the spur conforming to the shape of the twist, and the upper end ofthe spur and the recess in the twist conforming with relation to each other for protecting the upper cutting end of the s 111'.

In testimony whereof I aflix my signature.

STEPHEN D. STEADMAN.

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