| 摘要 |
A trolley 1 comprises a retractable wheel assembly 3 movable between stored and in-use positions. The wheel assembly 3 comprises an assembly support; at least one wheel arm 35 operably-connected to a wheel hub with a wheel 39; at least one control arm 36,37 operably-connected to the wheel hub 38, for affecting the orientation of the wheel hub with respect to the wheel arm as the retractable wheel assembly is moved between the stored position and the in-use position; and drive means connected to the assembly support and operably-connected to the at least one wheel arm and the at least one control arm, for providing rotation of the at least one wheel arm and at least one control arm about a common axis between the stored position and the in-use position. |
