Tools – Wrench – screwdriver – or driver therefor – Rigid jaws
Patent
1992-05-19
1993-03-16
Swann, J. J.
Tools
Wrench, screwdriver, or driver therefor
Rigid jaws
81487, 811801, B25B 1306
Patent
active
051934183
ABSTRACT:
A drum key having an elongated drum key shaft. The drum key shaft has a non-circular bore at an open end. A longitudinal bore axis of the non-circular bore is preferably aligned with a centerline axis of the drum key shaft. A torquing wing is integrally formed with the drum key shaft. A pair of elongated arcuate prongs are integrally formed with and extend outward from a neck which extends from an upper wing surface of the torquing wing. Prong tips of the arcuate prongs are spaced apart from each other. The arcuate prongs have inner arcuate surfaces which face or oppose each other. To prevent fracture or failure when the arcuate prongs are spread apart, stops extend from the upper wing surface and are positioned at a fixed distance designed to limit deflection of the arcuate prongs.
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Belieres, Par La Societe Spindler FIGS. 4-9, 13, 14 77346 Jul. 29, 1867.
Sanderson's Specification, Jun. 25, 1762, No. 777.
Wood & Gemmel's, Mar. 27, 1888, No. 4666.
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