Patent ID: 8403618

Claim:
A load handler mountable movably on a mast of an industrial lift truck, said load handler comprising: (a) at least a first hydraulic actuator capable of performing a first function in response to pressurized hydraulic fluid received from said lift truck, and a second hydraulic actuator capable of performing a second function in response to said pressurized hydraulic fluid, said first and second hydraulic actuators being movable independently of each other in response to said pressurized hydraulic fluid; (b). a solenoid-operated hydraulic selector valve assembly mounted on said load handler capable of moving between a first position, causing said pressurized hydraulic fluid to move said first hydraulic actuator, and a second position, causing said pressurized hydraulic fluid to move said second hydraulic actuator; (c). an electrical power source electrically independent of said lift truck mounted on said load handler and capable of supplying electrical power to said solenoid-operated hydraulic selector valve assembly effective to cause said pressurized hydraulic fluid to move said hydraulic actuators; (d). an electrical receiver mounted on said load handler capable of receiving first wireless signal transmissions and capable of selectively controlling said electrical power supplied from said power source to said solenoid-operated hydraulic selector valve assembly in response to said first wireless signal transmissions; and (e). an electrical transmitter mounted on said load handler powered by a battery of said electrical power source capable of generating second wireless signal transmissions adapted to identify a malfunction of said load handler and to control at least one of said hydraulic actuators in response to said malfunction.