Patent ID: 9593003
Date: 2017-03-14
CPC Classifications: B60B,B60G,B62B,B66F

Claim:
1. A wheel assembly for a material handling vehicle, comprising: a chassis; a first caster wheel mounted to the chassis; a second caster wheel mounted to the chassis; a torsion bar coupling the first caster wheel to the second caster wheel; a constant force mechanism coupled to at least one of the first caster wheel, the second caster wheel and the torsion bar; the first caster wheel and the second caster wheel being displaceable in at least one dimension; the constant force mechanism imparts a substantially constant force opposing a displacement of the first caster wheel and the second caster wheel in the at least one dimension; and wherein the constant force mechanism includes a first resistance member oriented to resist a displacement along a first axis, and a second resistance member oriented to resist a displacement along a second axis perpendicular to the first axis.