Patent ID: 8172248

Claim:
A trailer comprising a chassis connected with a draw bar assembly by a first linkage, an operating mechanism having opposing ends pivotally mounted to the draw bar assembly and the chassis whereby extension and retraction of the operating mechanism causes a respective lowering and raising of the chassis relative to the draw bar assembly, wheel-mount assemblies provided on either side of the chassis, a second linkage connecting each wheel-mount assembly with the draw bar assembly so that said lowering and raising the chassis provides a respective raising and lowering of the wheel-mount assemblies, the first linkage comprising a plurality of link arms forming a parallelogram linkage between the draw bar assembly and the chassis, the drawbar assembly and chassis forming substantially vertical links of the parallelogram linkage, whereby the draw bar assembly is permitted a substantially vertical arcuate range of motion relative to the chassis whilst remaining substantially parallel therewith to enable the chassis to be engaged with the ground.