Delivery trolley has leading caster wheel on chassis frame and associated with walking element projecting forward beyond caster for easier movement up and down steps

摘要

The delivery trolley (1) has a chassis frame (4) supported through a leading caster wheel(2) and at least two rear rollers. Steering arms supported by upright beams are provided in the region of the rear rollers and a walking element (12) such as a travelling skid is associated with the at least one caster. In its rest or starting position the walking element projects forwards beyond the caster. It is swivel mounted on the chassis frame (4) through a rod linkage to swivel about an axis aligned across the travel direction and during straight movement parallel to the caster wheel axis. Drive motors and sensors can be used to move the trolley.