The invention relates to an overhead conveyor of the type that comprises at least one drive carriage (13) which is drivably arranged in a girder system and from which load-holding means (18) are suspended, and where the girder system comprises an elongate straight box girder (9) having a first inner space with rails (12) for the drive carriage (13) and a second elongate inner space comprising a driven endless belt (5, 6) with means (23) to be drivingly connected to the drive carriage.(13).