Ball head polygonal wrench

Details Ball head polygonal wrench Ball head polygonal wrench

1979-09-24

1981-01-27

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

B25B 1348

Patent

active

042468116

ABSTRACT:
A wrench with a polygonal cross section includes an integral drive shank portion, a neck portion, and a drive head portion in a coaxial relationship along a central axis. The head portion has curved sides corresponding to the same number of sides as the shank portion with the radius of curvature of the sides being displaced outwardly from the longitudinal axis of the wrench so that each side substantially conforms to a portion of an ellipse whose minor axis lies along the central axis. The surface of the neck portion substantially conforms to an inwardly curved surface of revolution whose axis of revolution lies along the central axis of the wrench.

REFERENCES:
patent: 3213719 (1965-10-01), Kloack
patent: 3940946 (1976-03-01), Andersen
patent: 4080079 (1978-03-01), Waara

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