HOIST REVERSE INTERLOCK DEVICE

PURPOSE:To prevent falling of vehicle itself into a valley and prevent any damage of building by a method wherein electrification of an automatic electro- shift controller is automatically shut off and a backward movement of the vehicle is made impossible under a condition where a vessel is raised up. CONSTITUTION:When a vehicle is moved backward and a vessel 14 is raised up, a dump buzzar switch 13 is turned on, a circuit of buzzer 29 is closed and the buzzer 29 produces an alarm sound. Upon turning-on of the dump buzzer switch 13, a coil 15 of the first relay switch 11 is electrified, a contact piece 16 is brought in contact with the fifth terminal 5 under excitation of the coil 15, and the electrification to the automatic electronic-shift controller (A.E.S. C.) is cut off. When the vehicle is moved forward and the vessel is raised up, a back lamp switch 27 is turned off and excitation of the coil 17 is released, the contact piece 18 is moved away from the fifth terminal 5' and the controller A.E.S.C. is electrified.