US PATENT SUBCLASS 280 / 449
.~.~.~ Overload release

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

29  DF  WHEELED {21}
400  DF  .~ Articulated vehicle {30}
446.1  DF  .~.~ Condition responsive connections {4}
449.~.~.~ Overload release {3}
450  DF  .~.~.~.~> Notched bar and detent
451  DF  .~.~.~.~> Frangible member (e.g., shear pin)
452  DF  .~.~.~.~> Pivoted jaw or hook {3}

DEFINITION

Classification: 280/449

(under subclass 446.1) Devices in which the draft connection between the vehicles is automatically disconnected in response to a predetermined excessive stress therein.

(1) Note. The release of the connection between the vehicles upon overload may be only a partial release, allowing an increase in distance between the vehicles.

SEE OR SEARCH CLASS

172, Earth Working,

261+, for earth working apparatus with parts which shift upon the occurrence of an overload.

180, Motor Vehicles,

14.5, for motor vehicle trains with overload release means between the vehicles. 278, Land Vehicles: Animal Draft Appliances,

22, for automatic horse detachers.