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Heavy lift chair

  • US 7,090,297 B2
  • Filed: 10/13/2004
  • Issued: 08/15/2006
  • Est. Priority Date: 10/13/2004
  • Status: Active Grant
First Claim
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1. A power-assisted heavy lift chair comprising:

  • a base assembly,a chair frame supported on the base assembly,a lift mechanism that includes a rotational shaft, the rotational shaft communicating with the base assembly and the chair frame, and being operable to raise and lower the chair frame between raised and lowered positions;

    a transformer that receives a first voltage from a power supply and is operable to output a second voltage at a constant value independently of the current;

    an electric motor that draws current from the transformer according to a load on the chair frame, receives the second voltage, and provides rotational power to the lift mechanism via the rotational shaft at a first rate according to the second voltage independently of the current;

    wherein the rotational shaft rotates at a rate dependently of the second voltage and independently of a load on the chair so that the lift chair raises and lowers at a constant rate.

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