Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1993-04-26
1994-03-01
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 34, B25B 1700
Patent
active
052897435
ABSTRACT:
A one-piece handle member provided with a bore and a tubular pinion gear fixed to and projecting from a forward end of the handle coaxially with the bore is rotatably mounted on the rearward portion of a single drive shaft against a driven gear fixed coaxially to an intermediate portion of the shaft. A lug member fixed to the intermediate portion of the shaft on the other side of the driven gear projects laterally therefrom and supports a pivot spaced parallel to the drive shaft. First and second transfer gears connected for rotation together are rotatably mounted on the pivot with the first transfer gear permanently meshed with the pinion gear and the second transfer gear permanently meshed with the driven gear. A planar lock member slidably mounted in a slot extending cross-sectionally through the handle has exposed ends used to position the lock member relative to a shaft segment passing through the lock member. In one position the lock member locks the handle to the shaft whereby the shaft turns with the same torque as the handle. In another position the lock member frees the handle for rotation relative to the shaft whereby the gears rotate the shaft a lesser number of degrees than the handle with correspondingly increased torque. A cylindrical retaining ring rotatably secures the shaft to the handle by jamming inside the bore of the handle. In one embodiment a forward portion of the shaft engages the screw; another utilizes detachable screwdriver bits.
REFERENCES:
patent: 919156 (1909-04-01), Gilmore
patent: 2721591 (1955-10-01), Criswell
patent: 2979089 (1961-04-01), Piesker
patent: 3580097 (1971-05-01), Van Dalen
patent: 3992964 (1976-11-01), Osmond
patent: 4048874 (1977-09-01), Riches
patent: 4448098 (1984-05-01), Totsu
patent: 4846027 (1989-07-01), Lu
patent: 5009132 (1991-04-01), Gilberto
patent: 5033336 (1991-07-01), Chia-Tsai
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