# US 8,540,311 B1 · Magnetically suspended chair device

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- Number: US 8,540,311 B1
- Document ID: US8540311B1
- Status: Granted
- Kind: B1
- Application number: 13/412,852
- Filed: 2012-03-06
- Granted: 2013-09-24
- Earliest claimed: 2012-03-06
- Applicants: Paul Ablett
- Inventors: Paul Ablett
- Web page: https://patentgrep.com/patent/US8540311B1

## CPC

- A47C 3/20: Chairs or stools with vertically-adjustable seats
- A47C 31/003: {Magnets}
- A47C: CHAIRS; SOFAS; BEDS

## Abstract

The magnetically suspended chair device provides cushioned seat suspension above the base, as well as a unique aesthetic appeal. As proximity of the magnets increases repulsive forces, the second electromagnet of the seat bottom will not contact the first electromagnet of the seat base. Depending upon the seat bottom and seat back design, and the load imposed by a user thereon, the electromagnets are either centrally or off-center disposed. The arm assemblies guide the seat assembly in upward and downward movement away from and toward the base.

## Claims

### Claim 1

A magnetically suspended chair device comprising, in combination:
a base;
a first electromagnet centrally and upwardly disposed on the base, the first electromagnet having a core surrounded by a coil, the first electromagnet having a first pole spaced apart from a second pole;
a magnet case surrounding the first electromagnet;
a power supply connected to the first electromagnet;
a first arm assembly positioned upwardly on the base;
a second arm assembly spaced apart from the first arm assembly and positioned upwardly on the base;
a pad disposed atop each arm assembly;
controls disposed on at least one of the arm assemblies, the controls in communication with the first electromagnet;
a seat assembly the seat assembly having a seat bottom and a seat back;
an at least one guide disposed on each side of the seat assembly, each guide configured to slideably interact with each one of the arm assemblies, respectively;
a second electromagnet disposed downwardly on the seat bottom, the second electromagnet positioned by the guides to be directly above the first electromagnet, the second electromagnet having a core surrounded by a coil, the second electromagnet having a first pole spaced apart from a second pole, the second pole of the second electromagnet configured to face the second pole of the first electromagnet, the second electromagnet in communication with the power supply and the controls;
whereby the controls are configured to turn on a repulsive force of the electromagnets in positioning the seat assembly above the base.

### Claim 2 (depends on 1)

The device according to claim 1 wherein the controls are further configured to adjust the repulsive force of the electromagnets in adjustably positioning the seat assembly above the base.

### Claim 3 (depends on 1)

The device according to claim 1 wherein the arm assemblies are further parallel.

### Claim 4 (depends on 3)

The device according to claim 3 wherein the controls are further configured to adjust the repulsive force of the electromagnets in adjustably positioning the seat assembly above the base.

### Claim 5 (depends on 1)

The device according to claim 1 wherein the arm assemblies are further antiparallel;
the guides of the seat assembly in automatically adjusted contact with the arm assemblies.

### Claim 6 (depends on 5)

The device according to claim 5 wherein the controls are further configured to adjust the repulsive force of the electromagnets in adjustably positioning the seat assembly above the base.