Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2005-09-06
2005-09-06
Thomas, David B. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S186000
Reexamination Certificate
active
06938519
ABSTRACT:
A die assembly adapted to be attached to one of a wrench first arm and a wrench second arm. The die assembly includes a die having a pipe facing front spaced apart from but parallel to the pipe longitudinal axis, a wrench facing rear, and two spaced apart opposed sides, each connected to the die front and die rear. The die is thick on one side and thin on the other side so that the die facing front has a face that recedes from the pipe from one edge to the other edge so that contact between the die facing front varies depending upon the diameter of the pipe. The die rear also has a convex curve so that the die has a thick mid section.
REFERENCES:
patent: 2517366 (1950-08-01), Wilson
patent: 2596880 (1952-05-01), Weiss
patent: 2609720 (1952-09-01), Barnard
patent: 2720128 (1955-10-01), Woolley
patent: 2962919 (1960-12-01), Grundmann et al.
patent: 3205736 (1965-09-01), Crickmer
patent: 3215010 (1965-11-01), Montgomery et al.
patent: 4128135 (1978-12-01), Mitchhart et al.
patent: 4648292 (1987-03-01), Haynes et al.
patent: 5542318 (1996-08-01), Wesch, Jr.
patent: 5653297 (1997-08-01), Whisenhunt
patent: 6070500 (2000-06-01), Dlask et al.
Boyd James W.
Nelson Jack W.
Earl Lowe, Jr. James
Harnischfeger Technologies Inc.
Thomas David B.
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