| 摘要 |
<p>A releasable, reusable, slip-on she-bolt type gripper device designed for telescopic reception therein of one end of a cylindrical horizontally extending tie rod which is associated with a concrete wall form and serves to lateral displacement of the sides of the form when the latter is in use. The device is adapted to receive the reaction pull of the tie rod when the latter is under tension as a result of the pouring of wet concrete between the form sides. Longitudinally shiftable, chuck-forming jaw segments within the forward or inner frusto-conical end section of an elongated tubular shell are spring-biased so as frictionally to engage the adjacent end of the associated tie rod and are self-energized by the longitudinal pull of the latter. A pull rod is connected in common to all of the jaw segments, projects rearwardly through the rear or outer end of the shell and, when pulled rearwardly, releases the jaw segments from the tie rod. A flat spank near the rear end of the pull rod, when aligned with a retention slot in the outer end wall of the shell is capable of being pulled through such slot so that when the pull rod is rotated through an angle of 90 DEG and then released, the flat spank and slot cooperate to maintain the chuck jaw segments released from the tie rod until the pull rod is rotated to realign the spank and slot and then released.</p> |
