| 摘要 |
A hand tool, for example a garden pruner, has two pivotally interconnected members, each member comprising a blade (13,15) or other work-engaging portion and a handle (11,12) rigidly secured thereto, and a spring urging the members angularly apart. The pivot comprises a screw-threaded part (18) secured to member (15,16) and a complementary screw-threaded part (17) engaging screw-threaded part (18) and pressing against the other member (13,14) to press said members against one another, the member (15,16) having a worm screw (22) rotatably mounted thereon in meshing engagement with a gear (23) and secured to the screw-threaded part (17), the gear being fixed to the screw-threaded part (18) for rotation therewith and the arrangement being such that rotation of the worm screw causes relative rotation of the screw-threaded parts (17,18) thereby varying the pressure of one member against the other member. |
