Wrench engagement technologies

Details Wrench engagement technologies Wrench engagement technologies

2007-12-25

2007-12-25

Shakeri, Hadi (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S124300

Reexamination Certificate

active

11504153

ABSTRACT:
A wrench tool is described which comprises an orifice configured to control the rotation of a hexagonal work piece. The orifice is substantially cylindrical and comprises an array of only eighteen principle longitudinal grooves positioned therein substantially forming a symmetrical pattern around an imaginary central axis. The eighteen grooves are formed and spaced apart so as to create an array of only eighteen principle longitudinal protuberances. The protuberances substantially form a symmetrical pattern around the imaginary central axis for engagement with the hexagonal work piece. Each protuberance is formed having at least two engaging surfaces positioned together in at least partial alignment with a predetermined engaging angle. The engaging surfaces may be flat, arcuate, or a combination thereof.

REFERENCES:
patent: 3354757 (1967-11-01), Grimm et al.
patent: 5388486 (1995-02-01), Ruzicka et al.
patent: D465707 (2002-11-01), Chen
patent: 2005/0034570 (2005-02-01), Hsien

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