Heavy lift chair
First Claim
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.
3 Assignments
0 Petitions
Accused Products
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.
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Citations
16 Claims
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1. A power-assisted heavy lift chair comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A power-assisted heavy lift chair comprising:
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a base assembly; a chair frame supported on the base assembly that is operable to support a load; 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 within a threshold of a first period independent of the load; an electric motor that communicates with the lift mechanism and provides rotational power to the lift mechanism; a transformer that receives an AC voltage from a power supply and is operable to output a constant DC voltage;
whereinthe electric motor receives the constant DC voltage and draws current from the transformer according to a load on the chair frame, wherein the electric motor provides the rotational power at a first rate according to the constant DC voltage.
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Specification