US PATENT SUBCLASS 280 / 509
.~.~.~.~ Biased open

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

29  DF  WHEELED {21}
400  DF  .~ Articulated vehicle {30}
504  DF  .~.~ Coupling {7}
508  DF  .~.~.~ Self-coupling {2}
509.~.~.~.~ Biased open

DEFINITION

Classification: 280/509

(under subclass 508) Devices in which one of the coupling members includes a movable element which is biased to an open position by a spring or gravity or the equivalent to receive a complementary coupling member and is moved to a closed or coupled position by the action of the complementary coupling member during the coupling operation.