Mechanical coupling for overhead trolleys with cooperatively mating prizmatic projections

A coupling device for rigidly coupling together two spaced and elongated conveyor units that are aligned with each other and are adapted to be moved longitudinally in a direction of transport, said coupling device comprising two coupling members each being connected at one end to a conveyor unit, each of said coupling members having at least one prismatic projection that extends away from said one end of the member in the direction of transport of the units and at least one prismatic recess adapted to receive therein the prismatic projection of the other member, each prismatic projection having a first flat stop face that extends in a direction parallel to said direction of transport and that faces in a first direction perpendicular to said direction of transport and a coupling face that projects outwardly from said first flat stop face in a direction perpendicular to said direction of transport, the coupling face of at least one of said projections being movable relative to the coupling face of the other of said projections in a direction transverse to the direction of transport, and a second flat stop face on each of said coupling members that extends parallel to and is remote from said first stop face and that faces in a second direction opposite from said first direction, whereby when said coupling members are engaged and, said prismatic projections are received in said prismatic recesses, said first stop face of one projection abuts the first stop face of the other projection, the second stop face of one coupling member abuts the second stop face of the other coupling member and the coupling faces of each projection are engaged with each other to thereby couple the members together in the longitudinal direction of transport and prevent the coupling members from being offset with respect to each other in any direction transverse to said direction of transport.