Multi-stage hydraulic jack

Details Multi-stage hydraulic jack Multi-stage hydraulic jack

B - Operations, Transporting

66

F

B66F 3/42 (2006.01) B66F 3/25 (2006.01) B66F 3/26 (2006.01)

Patent

CA 2639246

A multi-stage jack apparatus, having a pump assembly including a pump block having a first cylinder and a second cylinder, and a piston assembly movable within the pump block having a first portion configured to sealably engage with the first cylinder and a second portion configured to sealably engage with the second cylinder; a reservoir for storing hydraulic fluid, and configured to supply fluid to the first cylinder and the second cylinder when the piston assembly is moving in a first direction; a lifting assembly having a ram chamber and a ram rod, the ram chamber configured to receive fluid from the first cylinder and the second cylinder when the piston assembly is moving in a second direction to raise the ram rod; a bypass check valve provided in the first cylinder configured so that when the piston assembly is moving in the second direction and the pressure in the first cylinder exceeds a predetermined value, fluid in the first cylinder bypasses the ram chamber assembly and returns to the reservoir.

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