| 摘要 |
A stationary tubular guide member has a upwardly directed open end and a vertically oriented longitudinal axis. A pivot pin has an upper portion projecting above the open end for engaging and supporting a swingable element, an intermediate portion between the upper portion and the open end, and a lower portion located within the guide member with limited freedom of axial displacement therein. A retaining pin prevents the pivot pin from turning with reference to the guide member. A downwardly open cap surrounds with its upper section the intermediate portion of the pin and with its lower section the guide member. Cooperating screw threads on the intermediate portion of the pin and on the upper section of the cap permit rotation of the latter with reference to the pin with a concomitant axial displacement of the latter relative to the guide member. |
