| 摘要 |
<p>The invention provides a trolley system comprising trolleys (20) which run on rails (10). Each trolley (20) comprises rollers (54) for running on a top running surface (12) of the rail (10), and opposite the rollers (54) are guide wheels (34) which are spring (44) loaded towards the rollers (54). The wheels (34) are adapted to engage between the limbs (14,16) of an inverted U-section bar which forms the rail (10) in order to retain the trolley (20) on the rail (10), but can be retracted against spring (44) action to be moved clear of the limbs (14,16) of the rail (10) for removal of the trolley (20).</p> |
