Carriage for overhead load carrier has four wheels with one driven wheel which is spring mounted to control load distribution on wheels

摘要

The carriage (1) for an overhead load carrier has four wheels to engage a running rail (7). At least one of the wheels is driven and this wheel is spring mounted (3'). The spring (15) extends in the direction of the applied load and has a spring characteristic selected so that when a set load is applied to the carriage, a further wheel on the same side of the carriage as the driven wheel, receives no load. The carriage is connected to the axis of the driven wheel by a parallel linkage.