Abstract: A fastening mechanism mounted in a pair of pliers comprises a pawl mechanism including an internal gear member and peripheral latched pieces, a peripheral ratchet inside a hole in one pliers with pawl mechanism disposed therein for catching and holding one of the latched pieces in a first position, a pivot joint having a circumferential gear member meshed with the gear member of pawl mechanism, an elastic member put on the joint, and a fastening member urged by the elastic member being secured to the joint. In gripping, the pawl mechanism is allowed to move in only one direction such that a release of the gripping on handles does not disengage a gripped object from the jaws in a second position. In releasing, press the fastening member to compress the elastic member for disengaging the pawl mechanism from the ratchet prior to returning to the first position once compression of the elastic member is released.

Abstract: A bar clamp comprises a triangular elastic positioning member sleeved on bar wherein bar is locked by positioning member in an unused position; an abutment plate sleeved on bar being slidable with respect to bar in unused position; a pivotal release lever obliquely extended down from abutment plate and having a pawl-like end; and a ratchet toothed section below the bar engaged with pawl-like end. In one of pressing operations, press the release lever for moving jaws toward each other by disengaging pawl-like end from ratchet toothed section temporarily. In a releasing operation, press the release lever to disengage pawl-like end from ratchet toothed section for unlocking bar prior to sliding the bar.