Tools – Bit stock having manual drive means – Having u-shaped crank arm
Patent
1993-07-22
1994-09-27
Meislin, D. S.
Tools
Bit stock having manual drive means
Having u-shaped crank arm
81 73, 811771, 81436, B25G 302
Patent
active
053498860
ABSTRACT:
A hand screw driver preventing a user's wrist from being twisted during screw driving operation. The screw driver comprises an offset shank having a tip at its lower end and being bent twice such that it has a Z-shape, and a handle having a shank receiving hole for rotatably receiving an upper section of the offset shank. The offset shank is shifted between a fixed position wherein it is fixed to the handle and a rotatable position wherein it is relatively rotated with respect to the handle. A biasing member is provided in the shank receiving hole of the handle to bias the handle with respect to the shank to shift the shank between the fixed position and the rotatable position as required. In one embodiment, the offset shank is provided at its upper section with an annular groove for receiving an annular leaf spring, and the handle is cut in at least two parts and provided in the shank receiving hole with an annular groove for receiving the annular leaf spring to hinge the offset shank to the handle, thus holding the offset shank to prevent its relative rotation with respect to the handle when the handle is inclined.
REFERENCES:
patent: 470687 (1892-03-01), Koelzer
patent: 1713434 (1929-05-01), Herrold
patent: 2761341 (1956-09-01), Stahl
patent: 2775276 (1956-12-01), Rossner
patent: 2810455 (1957-10-01), Johnson
patent: 4974477 (1990-12-01), Anderson
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