Multi-size wrench

Details Multi-size wrench Multi-size wrench

2009-07-10

2011-11-15

Shakeri, Hadi (Department: 3727)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S186000, C081S125100, C081S124300

Reexamination Certificate

active

08056448

ABSTRACT:
A multi-size wrench is defined with an engaging hole in a head thereof, and an inner surface of the engaging hole of the head is formed by six arc-shaped engaging concaves and six arc-shaped connecting convexes which are alternatively connected to each other in such a manner that between each two neighboring engaging concaves is connected a connecting convexes. An angle between the connecting lines from two ends of the respective arc-shaped engaging concaves to the center of the engaging hole is 50 degrees, and an angle between the connecting lines from the center of the engaging hole to a middle connecting point of each arc-shaped connecting convexes and to a connecting end of the connecting convex is 5 degrees. By such arrangements, the multi-size wrench is applicable to a Metric hexagonal fastener, an English hexagonal fastener and a torx fastener which are correspondingly sized.

REFERENCES:
patent: 5012706 (1991-05-01), Wright et al.
patent: 5388486 (1995-02-01), Ruzicka et al.
patent: 7270032 (2007-09-01), Hsieh
patent: 2008/0105093 (2008-05-01), Hart

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