US 2006/0076813 A1 · Heavy lift chair

Abstract

A power-assisted heavy lift chair comprises a base assembly. A chair frame is supported on the base assembly. A lift mechanism communicates with the base assembly and the chair frame, and is operable to actuate the chair frame between first and second positions. A transformer provides electrical power to an electric motor. The electric motor provides rotational power to the lift mechanism at a first rate to lift and/or lower the chair frame. The electric motor draws current from the transformer according to a load upon the chair frame. The rate that the electric motor lifts and/or lowers the chair frame depends upon the voltage provided by the transformer. The transformer is operable to provide a generally constant voltage regardless of the current draw of the electric motor. Therefore, the electric motor lifts and/or lowers the chair at a constant rate independent of the load on the chair.

Claims20

Dependent claims

A power-assisted heavy lift chair comprising:

a base assembly;
a chair frame supported on the base assembly;
a lift mechanism that communicates with the base assembly and the chair frame, and that is operable to actuate the chair frame between first and second positions;
a transformer that receives a first voltage from a power supply and is operable to output a second voltage;
and
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 at a first rate according to the second voltage,
wherein the motor operates at the first rate independently of the current and the transformer provides the second voltage at a constant value independently of the current.

4 more elements

Dependencies are inferred from the claim text.

Heavy lift chair

Life of this patent

Heavy lift chair

Life of this patent

Abstract

Claims20