In or relating to trolleys

A trolley comprising a retractable wheel assembly movable between stored and in-use positions, the wheel assembly comprising:

• an assembly support;
• at least one wheel arm operably-connected to a wheel hub, in use the wheel hub receiving a wheel;
• at least one control arm operably-connected to the wheel hub, 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 at least one control arm, for providing rotation of the at least one wheel arm and at least one control arm about a first axis between the stored position and the in-use position,
• wherein the at least one wheel arm is also pivotally-connected to the drive means about a second axis, such that both a rotational movement of the at least one wheel arm about the first axis and a pivotal movement of the at least one wheel arm about the second axis result in movement of the retractable wheel assembly between the stored position and the in-use position.

A trolley, comprising a retractable wheel assembly movable between stored and in-use positions, the wheel assembly comprising:

• an assembly support;
• at least one wheel arm operably-connected to a wheel hub, in use the wheel hub receiving a wheel;
• at least one control arm operably-connected to the wheel hub, 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;
• wherein the at least one wheel arm and the at least one control arm are connected to the wheel hub and drive means in a cross-wise, or ‘x’-shaped, manner, providing an intersect of the at least one wheel arm and at least one control arm at all states of operation of the wheel assembly;
• and
• wherein the intersect is caused to move in use along the lengths of the at least one wheel arm and at least one control arm, following rotation of those arms, to affect the orientation of the wheel hub.