Abstract: Clutch controlling apparatus which may be utilized in industrial-type vehicles, such as for example, forklift trucks, for controlling the vehicle during inching operations includes a source of fluid pressure, a fluid pressure-type clutch fluidically connected to the pressure source, an inching valve disposed within the fluid circuit connecting the fluid pressure source and the clutch mechanism which controls the degree to which the clutch mechanism is actuated and which in turn is actuated to a degree which is dependent upon the depression of the vehicle brake pedal, and limiting means for selectively inactivating the inching valve such that the inching valve is inoperative independent of the brake pedal.In this manner, when the vehicle is being operated on level ground, the inching operation is performed by intermittently depressing the brake pedal which actuates the inching valve which in turn deactivates the clutch mechanism thereby terminating driving torque to the vehicle transmission.

Abstract: Pneumatically operated devices respond to movement of a shift lever by decoupling change speed gears from both the input and output of a transmission and then brake the gears to a stop, shift gear engagements as necessary, release the brakes and re-engage the input and output clutches to re-establish drive at a newly selected drive ratio. A self-cycling control circuit is connected between the shift lever and pneumatic devices to actuate and deactuate such devices as necessary to accomplish a selected shift. The circuit includes means which enables re-engagement of the input and output clutches only after critical gear couplings and decouplings are established together with means which cycles the gears to facilitate engagements and disengagements if these have not occurred in a predetermined time. Means are also provided for preconditioning the system to respond quickly to a subsequent shift lever movement.

Abstract: An operating device for a double drum winch that has a hydraulically operated clutch, a brake and a hydraulic pressure variable control valve, and a single control lever connected to the hydraulic pressure variable control vavle to enable the operation of a hook and boom by one control lever so as to simplify the function and uses of the winch.