Tools – Wrench – screwdriver – or driver therefor – Plural pivoted jaws and handle-lever
Patent
1979-12-12
1981-06-02
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Plural pivoted jaws and handle-lever
81441, B25B 1302
Patent
active
042704189
ABSTRACT:
A tool for removing bungs and screws comprises a shank adapted for connection to a rotated drive and an enlarged head with transverse axial slots formed therethrough and an axial threaded bore defining a plurality of flutes. Each flute has a first flat axial side with a radial outer edge inclined outwardly toward the shank at an acute angle. The radial edge terminates in a flat relief surface extending at an increased acute angle toward the shank, and terminates in a flat clearance surface extending at a further increased angle. The relief surface terminates in a second flat axial side arranged at at least a 90 degree angle to the first flat side.
REFERENCES:
patent: 2445905 (1948-07-01), Busby
patent: 2619861 (1952-12-01), Wanamaker
Shephard Helen I.
Smith James G.
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