Bevel gears 3 and 4 rotate about fixed axes A and B. Rotation of lever 1 is transmitted through shaft 2, and bevel gears 3 and 4 to screw 5 which has helical motion, being connected by a screw pair to the housing (base). Mounted in gear 4 is sliding key a. Screw 6 is connected by a screw pair to screw 5; it has thread of the opposite hand and is held against rotation by a link (not shown) attached to eye b. This link advances together with screw 6.
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