Lift′ing-jack.
A hoisting-implement operated by a lever, a screw and lever, or by hydraulic pressure. The figures show forms of the leverjack. For other varieties, see list under jack. Fig. 2936 has a rack — bar raised by a lever pivoted in a strap, and the rack is sustained by a sliding spring catch. In Fig. 2937, the upper ends of the legs are connected by a lever, by whose depression they are erected and the wagon-axle raised. In Fig. 2938, the fulcrum-pin of the lever rests in rounded notches in the standard, and is held down by an extension pawl which is pivoted to the stand- [1306] ard and engages a ratchet on the upper side of the lever. |
| Lifting-jack. |
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| Lever-jack. |
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| Weight lifting-apparatus. |
