Tool bit and tool bit holder for hand held tools

Details Tool bit and tool bit holder for hand held tools Tool bit and tool bit holder for hand held tools

1992-02-20

1992-12-29

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool-support

With tool-retaining means

279 193, 279 195, 408226, B23B 3102

Patent

active

051746980

ABSTRACT:
In a combination tool bit and tool bit holder or chuck, rotary entrainment members (6, 7) extending over different circular arcs are formed in the tool bit holder for transmitting torque to the tool bit shank (8). Corresponding rotary entrainment grooves (9, 10), also extending over different circular arcs, are formed in the tool bit shank (8). Locking members (4) axially retain the tool bit in the holder. The locking members (4) can be displaced radially into or out of the recesses (11, 12) in the tool bit shank (8). The recesses (11, 12) are laterally closed. Due to the different configurations of the rotary entrainment members (6, 7) and the corresponding grooves (9, 10) it is possible to transmit higher torques while avoiding detrimental cross-sectional weakening of the tool bit shank (8).

REFERENCES:
patent: 4107949 (1978-08-01), Wanner et al.
patent: 4123074 (1978-10-01), Wanner
patent: 4131165 (1978-12-01), Wanner et al.
patent: 4502824 (1985-03-01), Dohse et al.
patent: 4691929 (1987-09-01), Neumaier et al.
patent: 4717292 (1988-01-01), Phillips
patent: 4840519 (1989-06-01), Kleine
patent: 4943192 (1990-07-01), Lafforgue et al.
patent: 5028057 (1991-07-01), Wanner
patent: 5076371 (1991-12-01), Obermeier et al.

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