| 摘要 |
An hydraulic load binder is disclosed for universal application, the piston rod assembly, the reservoir assembly and the pump assembly all being commonly housed. The channels to and from the pump and the piston rod chamber and the reservoir chamber are controlled by simple check valves. Two additional channels are provided for communicating the top of the piston rod chamber with the reservoir chamber. One of these additional channels includes a check valve which opens when the pressure in the piston rod chamber reaches a predetermined limit. The other additional channel is controlled by a needle valve, which is opened once a rotatable mechanical locking means is placed in locking position against the extended piston rod. Opening the needle valve depressurizes the piston rod chamber. The piston rod chamber is again pressurized to permit the mechanical lock to be released.
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