PRESSURE SWITCH TO DEFEAT PLATFORM FOLD OPERATION IN A HYDRAULIC LIFT

摘要

The present invention incorporates a fluid pressure sensing switch (18) in fluid communication with a hydraulic fluid outlet (12) of a hydraulic pump (10) driving a platform lift (4). The pressure switch is calibrated to activate at a pump outlet pressure created when the pump attempts to fold th e 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 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 positio n.