| 摘要 |
<p>A hand screw clamp (10) includes first and second jaws (12,14) and a pair of threaded rods (30), each having a handle (32) for manual rotation. Two first couplers (44) are mounted to the first jaw (12) and coupled to the threaded rods (30), and two releasable couplers (50) are mounted to the second jaw (14) and coupled to the threaded rods (30). The releasable couplers (50) each include a threaded portion (52) engageable with the threaded rods (30) and a slidable portion (54) sized to accommodate sliding movement of the threaded rods (30). A push plate (60) is movably mounted to the second jaw (14) and engaged with both of the releasable couplers (50). This push plate (60) is movable between a first position, in which both of the threaded portions (52) are engaged with the rods (30) and manual rotation of the handles (32) moves the second jaw (14) along the threaded rods (30), and a second position, in which both of the threaded portions (52) are disengaged from the threaded rods (30) and the threaded rods (30) are free to slide past the slidable portions (54) without rotation of the threaded rods (30). <IMAGE></p> |
