Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Patent
1989-05-15
1990-01-02
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
81443, B25B 2308
Patent
active
048905216
ABSTRACT:
A power driven screw driver self-gripping composite bit in the form of a pair of mirror image halved elements united at a common oblique interface providing a square end driver for reception in a screw head formed with a combined socket that accepts both a square end bit and a cross-point bit. Each halved element driver portion defines a trapezoidal cross section having major and minor parallel exterior side surfaces, a complete side surface extending at right angles to its major and minor surfaces, and a diagonal-like interface. The composite bit holder resiliently biases the halved elements interfaces into coextensive flush contact normally defining a square end driver. Upon threading torque being applied to the composite bit by a power screw driver the halved elements slip along their interfaces expanding the bit complete side surfaces in opposite directions so as to wedgingly engage their associated socket side faces into positive holding contact obviating slippage of the composite bit square end driver from the combined socket.
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Barthel Edward P.
Crysler Motors Corporation
Smith James G.
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