US PATENT SUBCLASS 180 / 417
.~ With fluid power assist

Current as of: June, 1999
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180 /   HD   MOTOR VEHICLES

400  DF  STEERING GEAR {8}
417.~ With fluid power assist {16}
418  DF  .~.~> Between articulated wheeled vehicle sections {2}
421  DF  .~.~> With condition modulated steering {1}
424  DF  .~.~> With swinging axle
425  DF  .~.~> Including flexible power transmitting means
426  DF  .~.~> Steering column supported {1}
428  DF  .~.~> With rack and pinion gearing intermediate steering shaft and power assist
429  DF  .~.~> Having rotary working member
430  DF  .~.~> Having flexible working member
431  DF  .~.~> Steering linkage includes interengaging gear means
432  DF  .~.~> With plural working members {1}
434  DF  .~.~> Working member movement traverses vehicle path {3}
438  DF  .~.~> Movable working member engages wheel steering arm
439  DF  .~.~> Movable working member is a moving cylinder
440  DF  .~.~> With linkage intermediate working member and wheel steering arm
441  DF  .~.~> Device to control pressure (e.g., valve)
442  DF  .~.~> Hydraulic circuit

DEFINITION

Classification: 180/417

With fluid power assist:

(under subclass 400) Subject matter in which there is provided motive means movable by the application of a pressurized fluid thereto to provide substantially all of the force required for guiding the vehicle, the initiating and/or remaining force being provided by a vehicle operator in

guiding the vehicle.