| 摘要 |
A stop member for limiting the range of adjustment provided by a positioning device. The positioning device is of the type wherein a piston is adjustable to various axial positions within a cylinder. The stop member has the form of a cup, coaxial with the cylinder and affixed to a portion of the piston rod which extends beyond the end of the cylinder, with the open end of the cup facing the cylinder. The diameter of the cup is sufficient to permit the end of the cylinder to advance into the cup as the piston is moved into the cylinder. The cylindrical wall of the cup is provided with axially-spaced slots. A stop element is inserted transversely to the axis through one of the slots and extends across the space within the cup to block the advancement of the cylinder into the cup, thereby limiting the relative movement of the cylinder with respect to the piston. In one embodiment, the stop element has a U-shape with its legs passing on opposite sides of the piston rod when the stop element is inserted. In another element, a collar around the cup retains two spaced bar-like stop elements which are urged into the slots in the cup.
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