Tools – Wrench – screwdriver – or driver therefor – Pivoted outer jaw
Patent
1998-06-10
2000-02-22
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Pivoted outer jaw
81109, 81412, B25B 1312
Patent
active
060267143
ABSTRACT:
An adjustable wrench is composed of a handle and a clamping member fastened pivotally with the handle and provided with two clamping surfaces forming therebetween an angle of 120 degrees. The clamping member is capable of turning on a pivoting point which is located at the center of the pivoting position of a clamped portion of the handle. The pivoting position has a horizontal width which is 3-3.5 times a distance between a longitudinal line of the pivoting point and a longitudinal line passing the curvature center of an arcuate lower clamping surface of the clamped portion of the handle. The arcuate lower clamping surface has a curvature radius which is 2.5-3.5 times a distance between the two longitudinal lines. The arcuate lower clamping surface has an arc line length corresponding in location to a circle center angle ranging between 70 and 90 degrees. When the handle is exerted on by an external force, the workpiece is held securely by a clamping force which is directly proportional in strength to the external force.
REFERENCES:
patent: 778814 (1904-12-01), Van Horn
patent: 788772 (1905-05-01), Johnson
patent: 1169379 (1916-01-01), Brown
patent: 1500314 (1924-07-01), Hacheney
patent: 1577789 (1926-03-01), Conway
patent: 1626309 (1927-04-01), Thurley
patent: 1900358 (1933-03-01), Mead
patent: 2645966 (1953-07-01), Mead
patent: 4893528 (1990-01-01), Chung-Hsing
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