| 摘要 |
A hydraulically actuated ram mechanism for pushing loaded pallets from the forks of a pallet jack lifting vehicle is disclosed. A hydraulically actuated ram including a push plate and a pair of hydraulic actuators is connected to the vehicle proximal the rear end of the forks. The hydraulic actuators are tied into the vehicles existing hydraulic system by installing a T-fitting and an electrically operated, normally closed hydraulic valve. The hydraulic valve includes an output port in fluid communication with each of the hydraulic actuators. The pallet jack operator controls the hydraulic ram using a switch electrically connected to the hydraulic valve. Upon activation of the switch, the hydraulic valve is opened and high-pressure hydraulic fluid is fed to each of the hydraulic actuators thereby causing the actuators to force the pallet off the forks. The hydraulic actuators may be retracted either by spring force, or by hydraulic pressure. In an alternate embodiment, the hydraulic ram may include multiple stages to achieve sufficient push plate travel.
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