Patent ID: 7303198
Filing Date: 2007-12-04
Classification: B60B,B62B

Abstract:
1. A trolley comprising: a trolley frame; front and rear wheel assemblies, one of the front and rear wheel assemblies including a pair of casters; each of the pair of casters having a first axis and a second axis transverse to the first axis and including a yoke mounted to the trolley frame in a manner that allows the caster to swivel about the first axis, and a caster wheel mounted to the yoke so as to be rotatable about the second axis, each of the pair of casters being operative to adopt a first orientation for forward travel of said trolley; and a fixed wheel assembly located between said pair of casters, said fixed wheel assembly including at least one wheel which has an axis of rotation which is orientated so that said fixed wheel assembly assists in maintaining directional control of said trolley in its forward travel, wherein the trolley frame is caused to lift on swiveling of the casters from their first orientation by having the centre of the caster wheels radially displaced from their first axes and having the first axes inclined to the vertical and extending rearwardly of the trolley and the at least one wheel of the fixed wheel assembly is positioned to engage the ground when the castors are in their first orientations and to be off the ground on swivelling of the casters about their first axes from their first orientations.