Opto-sensor steering system for forklift truck

Details Opto-sensor steering system for forklift truck Opto-sensor steering system for forklift truck

1994-03-22

1996-08-06

Culbreth, Eric D.

Motor vehicles

Steering gear

With fluid power assist

60431, 91516, B62D 507

Patent

active

055424902

ABSTRACT:
An electric forklift truck having a single motor which drives a pump which provides, via a priority valve, hydraulic fluid for both the working hydraulics and a steer unit on the truck. The motor is driven continuously at an idle speed in order to generate in the steer unit a dynamic load sensing signal to control the position of the priority valve. An optical sensor is associated with the steering column in order to provide an electric control signal to the motor controller to step up the speed of the motor in response to a steering demand.

REFERENCES:
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patent: 3939938 (1976-02-01), Inoue
patent: 4184333 (1980-01-01), Blaha et al.
patent: 4512367 (1985-04-01), Abe et al.
patent: 4537029 (1985-07-01), Gunda et al.
patent: 4557343 (1985-10-01), Pickering
patent: 4573319 (1986-03-01), Chichester
patent: 4665695 (1987-05-01), Rav et al.
patent: 4759182 (1988-07-01), Haarstad
patent: 5201380 (1993-04-01), Callahan

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