US762099A - Auger-bit. - Google Patents

Description

No. 762,099. PATENTED JUNE 7, 1904.

. N. SPBRRY.

AUGER BIT.

APPLICATION FILED MAR. 24. 1904.

N0 IODEL.

TM! NORRISPETZRSY cot. PHOTO-LITNO. WASHINGTON. n. c.

UNITED STATES Patented June '7, 1904.

PATENT OFFICE.

AUGER-BIT.

SPECIFICATION forming part of Letters Patent No. 762,099, dated June 7, 1904.

Application filed March 24:, 1904.

To all whom it may concern:

Be it known that I, NORMAN SPERRY, of Seymour, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Auger-Bits; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1, aside view of the end of an angerbit constructed in accordance with my invention; Fig. 2, a similar view turned half around; Fig. 3, an end or plan view.

This invention relates to an improvement in auger-bits, and particularly to that class which include a spiral head ,or body, two floor-lips, with a gimlet-point. In bits of this character it is desirable that a coarse thread should be employed on the point in The head or body A of the bit is of usual spiral form, terminating in floor-lips B C, and

Serial No. 199,673. (No model.)

while the inner edge of the lip B merges into,

a thread H, which extends around the point F midway between the threads G and dies out into the point about midway of its length. The thread G at the lower portion of the point forms a coarse thread and gives the required draw, while the thread H assists the thread G in giving sufficient out to the Wood and provides a cutting-thread for each floor-lip, thus giving all the practical advantages of a double-threaded point and the drawing qualities of a single thread. I

Having fully described my invention, What I claim as new, and desire to secure by Letters Patent, is

An auger-bit comprising a body, two floorlips and a point, a thread extending from one floor-lip to the outer end of the point, and a thread extending from the other floor-lip between the other threads and dying out above the outer end of the point, substantially as described.

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

NORMAN SPERRY. Witnesses:

FREDEEIc C. EARLE, CLARA L. WEED.

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