US PATENT SUBCLASS 280 / 427
.~.~.~ Interrelated operation of coupling, landing gear, and brake

Current as of: June, 1999
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280 /   HD   LAND VEHICLES

29  DF  WHEELED {21}
400  DF  .~ Articulated vehicle {30}
423.1  DF  .~.~ Semitrailer {7}
427.~.~.~ Interrelated operation of coupling, landing gear, and brake {3}
428  DF  .~.~.~.~> Interrelated brake and coupling
429  DF  .~.~.~.~> Landing gear actuated by coupling action {1}
431  DF  .~.~.~.~> Landing gear and coupling interlock

DEFINITION

Classification: 280/427

(under subclass 423.1) Devices which are provided with two or more of the following: (1) retractable landing gear to support the trailer when in uncoupled condition, (2) brakes to retard or prevent movement of the trailer, and (3) coupling mechanisms to detachably connect the trailer and tractor, the operation of at least two of these mechanisms being interdependent; i.e., the operation of one of the mechanisms actuates the other mechanism(s), or operation of one of the mechanisms is a condition precedent to the operation of the other(s).