| 摘要 |
A tension clamp includes, in combination, a main jaw co-extensive with an elongated adjusting arm, a movable jaw co-extensive with a hollow housing through which the adjusting arm is adapted to pass freely, a tension lever pivotally attached to and between two side cheeks of the housing, a secondary level pivotally fastened at one end thereof to the tension lever, the other end of the secondary lever being constrained with respect to the housing by means of a pin in sliding relationship with respect to a pair of registering travelling slots, each formed within a respective one of the side cheeks of the housing, the pin being adapted to engage selectively one of a number of semicircular notches formed within an edge of the adjusting arm remote from the main jaw, and the pair of travelling slots being adapted to guide sliding movement of the pin therealong from a first position wherein the pin is free of engagement with the notches to a second position wherein the pin engages one of the notches. Pivotal movement of the tension lever with respect to the housing initially causes the pin to slide along the pair of travelling slots from its first position to its second position whereby free sliding motion of the adjusting arm within the housing is prevented by the engagement of the pin in the one notch, and then causes the housing to lock securely with respect to the adjusting arm by an over-center action to grip firmly within the jaws any workpiece located therebetween.
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