Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Patent
1989-11-22
1991-10-15
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Having work engaging and force exerting portion inserted...
81452, B25B 2308
Patent
active
050563866
ABSTRACT:
The improved screwdriver bit and finder system of the present invention substantially aligns the axis of a screwdriver bit with the axis of a slotted-head fastener and maintains the alignment while the fastener is being driven. The inside diameter of a cylindrical finder and the diameter of a cylindrical driver portion and blade formed on an end of the bit are substantially matched in four different systems, with four discrete ranges of fastener head diameters. These matched systems of the present invention minimize the problems generated by conventional "one size fits all" bit and finders, namely, bit "wobble" in the finder and misalignment of the bit axis with the fastener axis, resulting in damaged bits and fasteners. In contrast, the axial alignment produced by the bit and finder system of the present invention minimizes the amount of driving force required and saves bits and fasteners from damage. The blade may be defined by a rectangular solid, the parameters of which are also selected to substantially match the slot size of the four discrete sizes of fasteners. Assembly of one embodiment of the bit and finder system of the present invention is quick and inexpensive, including the steps of forming the bit as a unitary structure drawing the finder into a cup-shaped cylinder, slipping it over the bit, sliding a coil spring over the bit and against the finder, and trapping the spring against the finder to bias the finder in the direction of the bit driver portion.
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patent: 4221249 (1980-09-01), Mazzeo et al.
patent: 4285255 (1981-08-01), Winfrey
patent: 4287923 (1981-09-01), Hornung
Black & Decker Inc.
Cruz Lawrence
Dearing Dennis A.
Del Ponti John D.
Smith James G.
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