Hand tool having a larger operation zone

Details Hand tool having a larger operation zone Hand tool having a larger operation zone

2007-02-23

2008-10-21

Meislin, D. S (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S124300

Reexamination Certificate

active

07437977

ABSTRACT:
A hand tool comprises a main body provided with a mounting portion including a plurality of arcuate protruding faces and a plurality of receiving recesses located between the protruding faces. Each of the receiving recesses of the mounting portion has an arc-shaped corner. A first distance is defined to be a distance between two walls of each recess.he two wall facing to each other. A second distance is defined to be a distance from a top to a bottom of each arcuate protruding face and a third distance D is defined to be a distance between two ends of a bottom side of the arcuate protruding face. A proportion of the first distance to the second distance is 1:1.6 and a proportion of the third distance to the second distance is 1:1.5.

REFERENCES:
patent: 3273430 (1966-09-01), Knudsen et al.
patent: 3354757 (1967-11-01), Grimm et al.
patent: 3763725 (1973-10-01), Reiland
patent: 4100824 (1978-07-01), Marschke
patent: 4930378 (1990-06-01), Colvin
patent: 5295422 (1994-03-01), Chow

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