| 摘要 |
A hydraulic jack device has a pump, a handle, a hydraulic cylinder, a rocking arm, and a lifting seat. A hydraulic shaft is inserted through the hydraulic cylinder and connected to the rocking arm. The rocking arm is connected to the lifting seat. The pump has a main body connected to the hydraulic cylinder, a chamber formed in the main body, a piston cylinder, a piston, and a C-shaped ring. The driven rod has a round end and a hollow box end. The driven rod passes through the piston cylinder, a coiled spring, and the piston. The round end of the driven rod is inserted in the chamber. A first and a second oil channels are formed in the hydraulic cylinder.
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