| 摘要 |
A trolley includes a front wheel assemblie ( 12 ) and a rear wheel assembly both assemblies mounted on a trolley frame. The front wheel assembly ( 12 ) includes a fixed wheel assembly ( 24 ) to aid control of the trolley. In one form the front wheel assembly ( 12 ) includes a pair of swivel castors ( 18 ) and a fixed wheel assembly ( 24 ) disposed between the castors ( 18 ). The front wheel assembly ( 12 ) is designed so that when the castors ( 18 ) swivel from their orientation for forward travel, the fixed wheel assembly ( 24 ) is caused to be lifted off the ground. The trolley also includes a camming device which is operative to lift the front wheel assembly ( 12 ) off the ground when the trolley is moved into a nested configuration with a like trolley.
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