Metal tools and implements – making – Blank or process – Augers
Patent
1993-06-14
1994-03-08
Parker, Roscoe V.
Metal tools and implements, making
Blank or process
Augers
761081, B21K 502
Patent
active
052918068
ABSTRACT:
A spade-type drill bit is disclosed having a shank portion and a spade bit portion extending from the shank portion. The spade bit portion includes a spade portion with a planar region, and a center tip concentric with a longitudinal axis and extending from the spade portion. First and second radial cutting edges extend from the center tip toward first and second corner tips. First and second longitudinal cutting edges extend along longitudinal sides of the spade portion and terminate at the first and second corner tips. The first and second corner tips are located forward of the plane of the spade portion in the direction of rotation of the drill bit. The first and second radial cutting edges, and the first and second longitudinal cutting edges further include curved portions adjacent each of the first and second corner tips. Threads may also be provided on the center tip. A method of manufacturing is disclosed wherein each of the corner tips are formed by cutting from a smashed planar portion of a round rod an outline of the spade bit and further bending each of the corner tips in a direction of rotation of the spade bit.
REFERENCES:
patent: 1799318 (1931-04-01), Rehback
patent: 2627292 (1953-02-01), Kronwall
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patent: 3121351 (1964-02-01), Mount
patent: 3920350 (1975-11-01), Southall
patent: 3997279 (1976-12-01), Porter
patent: 4066379 (1978-01-01), Prohaska
patent: 4286904 (1981-09-01), Porter et al.
patent: 4527449 (1985-07-01), Sydlowski et al.
patent: 4682917 (1987-07-01), Williams III et al.
Photos of drill bit sample No. 1 (labelled Exhibit A).
Photos of drill bit sample No. 2 (labelled Exhibit B).
Photos of drill bit sample No. 3 (labelled Exhibit C).
Photos of drill bit sample No. 4 (labelled Exhibit D).
Photos of drill bit sample No. 5 (labelled Exhibit E).
Enderes Tool Company, Inc.
Parker Roscoe V.
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