Patent ID: 8167095

Claim:
A trolley, comprising: an immobilizer having a deactivated state which permits the trolley to be used and an activated state which prevents the trolley from being used outside a permissible region, the immobilizer having a steering axis and having a transportation roller which is rotatable in both the activated and deactivated states of the immobilizer and touches a carriageway by way of a standing area, and the transportation roller has a caster angle in the deactivated state of the immobilizer, said caster angle being produced by a distance being present between a location at which the steering axis intersects the carriageway and the standing area of the transportation roller on the carriageway, when the immobilizer is activated, geometric relationships between the location at which the steering axis intersects the carriageway and the standing area are changed such that the location at which the steering axis intersects the carriageway runs substantially in the standing area of the transportation roller.