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US Patent: 4,753,141
Adjustable Wrench
James N. Hamrick - Rutherfordton, NC
James N. Hamrick, Jr. - Rutherfordton, NC

USPTO Classifications:
81/166, 81/167, 81/186, 81/418

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches


Not known to have been produced

none listed

Patent Dates:
Applied: Jan. 09, 1987
Granted: Jun. 28, 1988

Patent Pictures:
USPTO pdf tiff
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An adjustable wrench having a fixed jaw and a spring biased movable jaw. A coil spring acts on an end of a worm gear opposite the fixed jaw, which, in turn, acts on a rack of teeth provided on a portion of the movable jaw to force the movable jaw towards the fixed jaw. The worm gear is rotated to advance the movable jaw against an object which is to be gripped. Upon contact of both the movable jaw and the fixed jaw with the object, the worm gear is rotated further to compress the coil spring. The force of the coil spring against the worm gear diminishes looseness between the worm gear and the movable jaw, and compression of the coil spring further diminishes any such looseness and enhances holding power of the wrench about the object.

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