| 摘要 |
A hydraulic lifting jack on wheels, comprising a pair of frame plates, an elevator pivotally mounted on the frame plates, a lifting saddle arranged in the free end of the elevator, and a hydraulic power unit for lifting the elevator, in which a safety device for the elevator is further provided and comprises a support block member pivotally mounted to the elevator, and step block members, each having stop steps in its front slope surface, secured to the frame plates. The support block member is pivoted by a lever into an engaging or disengaging position wherein the support block member engages or disengages with or from the step block members. When the support block member is positioned in the engaged position, the raised elevator is prevented from falling down by the support block member, the bottom of which is supported by the stop steps of the step block members.
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