Fitting hole of a hand tool

Details Fitting hole of a hand tool Fitting hole of a hand tool

2007-09-18

2007-09-18

Meislin, D. S. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S186000

Reexamination Certificate

active

11378372

ABSTRACT:
A fitting hole of a hand tool such as a socket or a wrench for fitting on and wrenching a screwing member. The inner wall of the fitting hole is formed with twelve teeth at equal intervals. The teeth define therebetween twelve recesses at equal intervals. Each tooth has a tip formed with a plane. The plane of the tooth and a tangent of the tooth contain an angle of 15 degrees. A first end of the plane is closer to a center of the fitting hole. A second end of the plane of the tooth is farther from the center of the fitting hole. An arced tooth section is formed on one side of the tooth. The fitting hole can be fitted on various screwing members to wrench the same, and is applicable to both normal and worn screwing members.

REFERENCES:
patent: 3885480 (1975-05-01), Muenchinger
patent: 5832792 (1998-11-01), Hsieh
patent: 6079299 (2000-06-01), Sundstrom
patent: 6098501 (2000-08-01), Sundstrom
patent: 6904833 (2005-06-01), Wright
patent: 6962100 (2005-11-01), Hsien
patent: 7107879 (2006-09-01), Cheng
patent: 2002/0184976 (2002-12-01), Mizuno et al.
patent: 2004/0149088 (2004-08-01), Yamamoto
patent: 2004/0221688 (2004-11-01), Liao
patent: 2006/0117917 (2006-06-01), Lin
patent: 2006/0130618 (2006-06-01), Hsieh

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