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

1992-12-22

1994-10-11

Kisliuk, Bruce M.

Abrading

Abrading process

Drill, thread, thread cutter, reamer, or rotary cutter abrading

451375, B24B 100

Patent

active

053535529

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: 2328549 (1943-09-01), Eich et al.
patent: 2889669 (1959-06-01), Babbitt
patent: 3037329 (1962-06-01), Ernst et al.
patent: 3067548 (1962-12-01), Winslow
patent: 3656264 (1972-04-01), Mackey, Jr. et al.
patent: 3916582 (1975-11-01), Costil
patent: 4826368 (1989-05-01), Tikal et al.
patent: 5179809 (1993-01-01), Schroeder

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