US4245149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system for chairs
Assignee: Individual
•
Filing: 1979-04-10
•
Granted: 1981-01-13
•
Expires: 1999-04-10
Abstract
Abstract The invention relates to a heating element for a heated chair which can be used as a covering material for the heated chair or which can be laid under the covering material or which can be draped over an ordinary chair to convert it to a heated chair. In accordance with the invention, the heating element has a glass fibre fabric layer made of intermixed glass fibre strands. An electrical resistance wire which consists of a core of glass fibre strands with a resistive wire wound around it, forms an undulating pattern in the glass fibre fabric layer, and top and bottom layers of thermoplastic material are heat fused or adhesively laminated to the glass fibre fabric layer. A metallic foil layer is applied to the side of the bottom layer which is remote from the glass fibre fabric layer. The heating element also includes a control for controlling the power delivered to the resistance wire. The said control is a simple dual proportional control which regulates the energy usage of the heating element.
Inventors
- 👤 Ian F. Fairlie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:29
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0227; H05B1/0252; H05B1/0272; H05B3/00; H05B3/20; H05B3/34; H05B3/342; H05B3/347; H05B2203/00; H05B2203/014; H05B2203/015; H05B2203/017; H05B2203/029
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
244 words
A flexible heating element comprising: a fibre fabric layer made of intermixed glass fibre strands; electrical resistance heating wires in said fibre fabric layer and defining a regular pattern in said fibre fabric layer; a top layer of a thermoplastic material on one side of said fibre fabric layer; a bottom layer of a thermoplastic material on the other side of said fibre fabric layer; and a metallic foil layer applied to the bottom layer on the side remote from said fibre fabric layer; said bottom layer and said metallic layer being fused to said fibre fabric layer, and said top layer being fused with said bottom layer, whereby said top and bottom layers enclose said glass fibre fabric layer and said electrical resistance means to form an integral laminated sheet; and further comprising means for connecting said resistance heating wires to a source of electrical power; said means for connecting said resistance heating wires comprising terminals connected to said heating resistance wires and extending out of said laminated sheet; control means in said connecting means for controlling power delivered to said resistance wire, and wherein said control means comprises a first control for setting a power level; and a bimetallic switch; said bimetallic switch being controlled by said power level and ambient temperature of air surrounding said control means; whereby a comfort level is set by said first control and a duty ratio, sensitive to ambient temperature, is set by said bimetallic switch.
Claim 2
Dependent Claim
244 words
A flexible heating element comprising: a fibre fabric layer made of intermixed glass fibre strands; electrical resistance heating wires in said fibre fabric layer and defining a regular pattern in said fibre fabric layer; a top layer of a thermoplastic material on one side of said fibre fabric layer; a bottom layer of a thermoplastic material on the other side of said fibre fabric layer; and a metallic foil layer applied to the bottom layer on the side remote from said fibre fabric layer; said bottom layer and said metallic layer being fused to said fibre fabric layer, and said top layer being fused with said bottom layer, whereby said top and bottom layers enclose said glass fibre fabric layer and said electrical resistance means to form an integral laminated sheet; and further comprising means for connecting said resistance heating wires to a source of electrical power; said means for connecting said resistance heating wires comprising terminals connected to said heating resistance wires and extending out of said laminated sheet; control means in said connecting means for controlling power delivered to said resistance wire, and wherein said control means comprises a first control for setting a power level; and a bimetallic switch; said bimetallic switch being controlled by said power level and ambient temperature of air surrounding said control means; whereby a comfort level is set by said first control and a duty ratio, sensitive to ambient temperature, is set by said bimetallic switch.
Claim 3
Dependent Claim
32 words
A heating element as defined in claim 1 wherein said electrical resistance wires comprise an insulating core of glass fibre and a resistive wire wound around said core in a helical path.
Claim 4
Dependent Claim
39 words
A heating element as defined in claim 2 wherein said top and bottom layers are made of a material which is electrically insulating to 275 volts, and wherein the thickness of each said layer is 0.5 to 2.0 mm.
Claim 5
Dependent Claim
43 words
A heating element as defined in claim 3 wherein said glass fibre fabric layer is made of said glass fibre strands matted in a semi-regular pattern, and wherein said electrical resistance wire is intermatted in said glass fibre strands in an undulating pattern.
Claim 6
Dependent Claim
42 words
A heating element as defined in claim 3 wherein said glass fibre fabric is made of said glass fibre strands, woven in a regular pattern and wherein said electrical resistance wire is interwoven in said glass fibre strands in an undulating pattern.
Claim 7
Dependent Claim
43 words
A heating element as defined in any one of claims 4 or 5 and further comprising means for connecting said resistance wire to a source of electrical power; and control means in said connecting means for controlling power delivered to said resistance wire.
Claim 8
Dependent Claim
17 words
A heating element as defined in claim 1 and further comprising an ON/OFF switch comprising a microswitch.
References Cited (Backward Citations)
CA777289A
Cited
CA868615A
Cited
US2613306A
Cited
US2719907A
Cited
US2783358A
Cited
US2845519A
Cited
US2706768A
Cited
US2967415A
Cited
US2938992A
Cited
US3031739A
Cited
USRE26522E
Cited
US3153140A
Cited
US3422244A
Cited
US3417229A
Cited
US3564203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |