| 摘要 |
device for locking workpieces comprises a body (12) to which a fluid operated actuator (14) including a slidable rod (20) is associated, as well as a pair of arms (26, 28) articulated about respective stationary pins of rotation (42, 44). The oscillation of the arms (26, 28) is controlled by a mechanism comprising a control member (56) that is axially movable together with the rod (20), which has two slots (58) inclined and symmetrical with respect to the axis of the rod (20). Each slot (58) is slidably engaged by a movable transverse pin (60) crossing also a through opening (68) of a respective arm (26, 28). The opposite ends of each movable transverse pin (60) are slidably engaged in shaped guide formations (64) of a pair of side members (34, 36) of the body (12).
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