(under subclass 504) Devices in which the opposing coupling members automatically assume a coupled or connected relationship as a result of relative movement toward one another in a horizontal plane and require no manual manipulation at the time of making the connection.
(1) Note. This subclass includes patents where a manual manipulation may be required to preset or condition one of the coupling parts for the connecting action prior to relative movement and actual connection of the parts.
SEE OR SEARCH THIS CLASS, SUBCLASS:
434+, for semitrailer self-coupling devices.
SEE OR SEARCH CLASS
172, Earth Working,
275, for earth working apparatus comprising a self-coupling connection between a motor vehicle and an implement.
