COUPLING MECHANISMS FOR TRACTOR SEMI-TRAILER VEHICLE COMBINATIONS HAVING CONNECTING MEANS FOR THE ELECTRICAL, PNEUMATICAL HYDRAULICAL SERVICE LINES FROM THE TRACTORS TO THE SEMI-TRAILERS

摘要

A coupling mechanism for a tractor semi-trailer vehicle combination comprises a fifth wheel mechanism supported on the tractor and king pin means supported on the semi-trailer, and the fifth wheel mechanism comprises a locking bolt and the king pin means is arranged to be engaged by the locking bolt for securing the coupling therebetween in such a way that pneumatical and electrical connector members housed in the locking bolt and in the hollow king pin means after connection are held together without undue rotational movements between the parts.