| 摘要 |
The specification describes economical lifting devices. A consumer jack comprising a rectangular base; a pair of connecting arms that are pivotally attached to the front end of the base, and a pair of lift arms that are attached to the connecting arms and attached at the rearward ends thereof to a sliding block. A screw-threaded actuator shaft is engaged with the sliding block to raise and lower a lifting pad attached to the forward ends of the lift arms of the device. The components are stamped from steel sheet and plate, and folded into the desired configuration, and assembled without the need for machining or welding.An economical power unit, for use with an economical jack stand and also for use with a lift bridge, comprises an adaptation of the consumer jack. The power unit does not use the lifting pad, but rather utilizes a pair of separated leveling pads pivotally attached to the forward ends of the lift arm for engagement with a lift collar of the jack stand. The power unit further features a slide forward bridge for use (without the jack stand) directly as a lifting device.An economical jack stand for use with the power unit is similarly formed from steel sheet and plate comprising a base plate, tubular housing extending upward from the plate, and a telescopic U shaped ratchet shaft extendable from within the housing. A pair of pawls can be engaged to lock the ratchet shaft in position within the housing.
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