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Caster wheel with constant force mechanism

  • US 9,593,003 B2
  • Filed: 05/01/2014
  • Issued: 03/14/2017
  • Est. Priority Date: 04/01/2014
  • Status: Active Grant
First Claim
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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.

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