Patent ID: 8276485
Filing Date: 2012-10-02
Classification: B25B,B25G

Abstract:
1. A pivot head wrenching tool comprising: a handle including a receiving space, a bore, and a channel, with the receiving space disposed separately from the bore, with the channel interconnecting the receiving space and the bore; a switch rotatably engaged in the bore and including a first circumferential edge extending in a first plane and including first and second surfaces, with the switch operable in a first position including the first surface facing the channel and in a second position including the second surface facing the channel; a pawl disposed in the channel; a torsion spring engaged with the switch, with the torsion spring including a length encircling the switch, with the torsion spring including first and second ends restrained in the switch and the handle respectively, with the first and second ends of the torsion spring extending in two different directions, with the switch including a slot extended therein receiving the first end of the torsion spring, with the first end of the torsion spring extending upwardly along the switch, with the second end of the torsion spring extending horizontally and away from the switch and oppositely to the pawl, with the torsion spring tensioned upon rotating the switch in a first direction, with the torsion spring untensoined upon rotating the switch in a second direction reverse to the first direction; and a pivotal driving head pivotally movable at various pivotal positions with respect to and engaged with the handle, with the pivotal driving head including a connecting end and a driving end, with the connecting end and the handle including a pivot interconnecting therewith for connection between the pivotal driving head and the handle, with the connecting end received in the receiving space, with the driving end used for engaging with an object to be driven by the pivot head wrenching tool, with the pivotal driving head including the connecting end releasably engaged with the pawl; wherein the pivot head wrenching tool is operable in a lock mode in which the pivotal driving head is restrained from being pivoted and in an unlock mode in which the pivotal driving head is able to be pivoted, with the switch in the first position and including the first surface abutted against the pawl as well as the pawl engaged with the connecting end of the pivotal driving head when the pivot head wrenching tool is in the lock mode, with the switch in the second position and including the second surface gapped from the pawl as well as the pawl disengaged from the connecting end of the pivotal driving head when the pivot head wrenching tool is in the unlock mode, with the pawl moving towards the switch to disengage from the connecting end of the pivotal driving head upon pivoting the pivotal driving head, with the switch automatically moving from the second position to the first position under resilient force of the torsion spring.