| 摘要 |
A service jack for use in jacking vehicles and the like and including a lift member supported by a frame for movement between a lower position and a raised load carrying position. A hydraulic lift cylinder is provided for causing selective movement of the lift member between the first position and load carrying position. A hydraulic pump is also provided for selectively forcing hydraulic fluid into the hydraulic lift cylinder to cause movement of the lift member from the first position to the second position. The hydraulic pump includes a pump cylinder, and a pump piston housed in the pump cylinder, a pinion about an axis, said pinion including gear teeth. A rack is fixed to the pump piston, the rack including gear teeth meshing with the gear teeth of a pinion supported by the frame for rotation, the pinion being rotably driven by pumping movement of the jack handle.
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