Surface conforming, torque enhancing wrench with non-parallel wo

Details Surface conforming, torque enhancing wrench with non-parallel wo Surface conforming, torque enhancing wrench with non-parallel wo

1998-05-15

1999-09-21

Scherbel, David A.

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

811211, 811243, 811247, 81186, B25B 1302

Patent

active

059539682

ABSTRACT:
The present invention involves a wrench for tightening and loosening bolts, nuts and fasteners having n number of equal length outside working surfaces. The wrench has a handle and a working wrench head with an orifice which contains at least two pairs of flat inside working surfaces. The pairs of inside working surfaces are arranged about and equidistant from an imaginary central axis through the orifice, and the surfaces of each pair form a surface contact angle a with one another. Additionally, each pair of flat inside working surfaces having a first working surface with a predetermined angle C relative to the imaginary central axis and a second working surface with a predetermined angle D relative to the imaginary central axis, wherein the angle C and the angle D differ from one another, and whereby the first working surface of a given pair of inside working surfaces is non-parallel to the second working surface of an opposing pair of inside working surfaces.

REFERENCES:
patent: 3241409 (1966-03-01), Raptis
patent: 3242775 (1966-03-01), Hinkle
patent: 3695124 (1972-10-01), Myers
patent: 3881377 (1975-05-01), Evans et al.
patent: 4361412 (1982-11-01), Stolarczyk
patent: 4512220 (1985-04-01), Barnhill, III et al.
patent: 4598616 (1986-07-01), Colvin
patent: 4882957 (1989-11-01), Wright et al.
patent: 5131312 (1992-07-01), Macor

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