Root-strength drill bit and method of making

Details Root-strength drill bit and method of making Root-strength drill bit and method of making

1990-11-05

1993-02-09

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

408230, 408704, B23B 5102

Patent

active

051849267

ABSTRACT:
An improved drill bit having a shank of larger diameter than the body of the drill has an intermediate section rearward of the point section of the drill of smaller diameter than the point, and a longitudinally elongated, enlarged diameter root section joining the rear end of the intermediate section to the shank. The reduced diameter of the intermediate section provides a clearance space, preventing rubbing of the wall of a hole drilled by the bit, while the enlarged diameter root section increases the resistance of the bit to breaking. An improved method of making the enlarged-root drill bit includes inclining a relieving wheel at a substantially smaller angle to the longitudinal axis of a blank than the angle at which the blank was fluted. In one embodiment having a front tapered tip made by the novel method, rearwardly directed teeth are formed at the rear plane of the drill point, by fluting and relieving steps alone, without requiring an additional machining step.

REFERENCES:
patent: 2775148 (1956-12-01), Campbell
patent: 2794470 (1957-06-01), Wright
patent: 2897695 (1959-08-01), Winslow
patent: 3564948 (1971-02-01), Pomernacki
patent: 4536108 (1985-08-01), Saxton et al.
patent: 4555204 (1985-11-01), Cassidenti
patent: 4580933 (1986-04-01), Wilkins
patent: 4962820 (1990-10-01), Fischer
patent: 5031709 (1991-07-01), Fischer

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