Patent ID: 6679139
Filing Date: 2004-01-20
Classification: B25B

Abstract:
A wrench, comprising:a wrench head having a fixed jaw thereon, the wrench head defining a first aperture, a spindleway communicating with the first aperture, and a second aperture communicating with the spindleway; a movable unit disposed in the wrench head, comprising a rack partially extending into the first aperture and a jaw opposing the fixed jaw; a worm gear positioned within the first aperture and defining a central axis, comprising a rotatable portion engaging the rack and axially movable within the first aperture between a first position and a second position, and a spindle extending axially from the rotatable portion along the central axis and axially movable with the rotatable portion, the spindle having a distal end slideably disposed within the spindleway; and a locking mechanism disposed in the second aperture, the locking mechanism being movable between a locked position and an unlocked position, wherein in the locked position a portion of the locking mechanism is disposed at a first point between the distal end of the spindle and a second point on the wrench head on a side of the second aperture, said first and second points being substantially aligned with the distal end along said central axis to maintain the rotatable portion of the worm gear in the first position.