PRESSURE SWITCH TO DEFEAT PLATFORM FOLD OPERATION IN A HYDRAULIC LIFT

摘要

In a preferred embodiment, the present invention incorporates a fluid pressure sensing switch in fluid communication with a hydraulic fluid outlet of a hydraulic pump driving a platform lift. The pressure switch is calibrated to activate at a pump outlet pressure created when the pump attempts to lift (fold) the platform into the stow position when it carries a load. The switch is calibrated not to activate at a pump outlet pressure created when the pump attempts to lift (fold) the platform into the stow position when the platform is unloaded. Activation of the pressure switch disables the hydraulic pump, thereby preventing a loaded platform from being folded into the stow position.