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 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.
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
20 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 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. - View Dependent Claims (2, 3, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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4. (canceled)
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5. (canceled)
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6. (canceled)
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19. 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 communicates with the base assembly and the chair frame, and that is operable to actuate the chair frame between first and second positions;
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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20. 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