| 主权项 |
1. An open ended ratchet wrench comprising:
a wrench head comprising
a pair outer face plates spaced apart from, and facing toward, one another and defining opposing faces of said wrench head, the outer plates having respective voids overlying one another and extending into the outer plates from matching ends of the outer plates so that boundaries of the voids delimit sides of a jaw space that has an open end at said matching ends of the outer plates;a set of gripping pieces carried between the pair of outer face plates and comprising a pair of opposing gripping pieces that face toward one another from opposing sides of the jaw space, each gripping piece comprising a working side that faces into the jaw space and comprises two working faces that lie at an oblique angle to one another on opposite sides of an inner corner of the gripping piece for fitting of the inner corner of the gripping piece over a respective outer corner of a fastener so that the two working faces lie along respective peripheral faces of the fastener, and each gripping piece being movably carried between the pair of outer face plates for displacement relative to the plates between a release position and a working position in which the working side of the gripping piece is disposed further into the jaw space than in the release position;a force member slidably that is disposed between the outer face plates, is movable relative thereto between withdrawn and extended positions that are spaced apart in a longitudinal direction denoted by a longitudinal plane that bisects the jaw space through the open end thereof, and is arranged such that movement of the force member from the withdrawn position to the extended position forces the gripping pieces into the working positions from driving sides of the gripping pieces that lie opposite the working sides thereof in order to force the gripping pieces into frictional contact with the peripheral faces of the fastener, the force member having an open interior that opens toward the jaw space and features converging sides that are joined together by a closed end of the open interior and are positioned on opposing sides of the longitudinal plane at the opposing sides of the jaw space to respectively act against the pair of opposing gripping pieces at the driving sides thereof; and a handle pivotally coupled to the wrench head and having an elongated shape projecting from the wrench head, the handle being pivotal in a driving direction about a handle-pivot axis passing through the outer face plates of the wrench head to push the force member into the extended position, and also being pivotal about the handle-pivot axis in an opposing release direction to back the handle off from the force member. |
