US3912903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating device for air duct
Assignee: ARCO COMFORT PRODUCTS 515 SOUTH FLOWER STREET LOS ANGELES CA A CORP OF
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Filing: 1973-04-16
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Granted: 1975-10-14
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Expires: 1993-04-16
Abstract
Abstract An electrical resistance heating device for use in an air duct connected with a blower for heating air forced across the device along the duct, comprising a mounting plate, a pair of spaced parallel support bar assemblies connected with the mounting plate the support bar assemblies each including a thin plate aligned parallel with the direction of air flow in the duct, an electrical resistance-type heating element formed of a single length of wire coiled about the support bar assemblies including staggered straight sections of substantial length extending in parallel relationship so that the major portion of the element is made up of parallel straight wire sections and semicircular connecting sections between the straight sections extending around and spaced from the outside faces of the thin plates for maximum air cooling, and insulated connectors through the mounting plate coupled with the heating element and adapted to be connected to an electrical circuit for supplying power to the device.
Inventors
- 👤 Jr Leonard L Northrup
- 👤 James L Northrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:18
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
277 words
An electrical resistance-type heating device comprising: a mounting plate; spaced support bar assemblies secured at opposite ends of said mounting plate, each of said support bar assemblies having a conductor bar formed of an electrical current conducting material and a substantially flat, thin heating element mounting plate formed of a heat-resistant dielectric material secured to said conducting bar for supporting a heating element, the planar surfaces of said dielectric mounting plate being aligned in a direction parallel with the line of air flow past said heating device for providing minimum air resistance to air flow along said dielectric plate; a heating element formed of a straight electrical resistance type conductor shaped in a modified helix pattern having a plurality of straight sections interconnected at opposite ends of said heating element by curved turn sections whereby said straight sections are aligned in two spaced parallel planes, said straight sections in one of said planes being misaligned from said straight sections in the other of said planes, said heating element being mounted on said dielectric plates of said mounting bAr assemblies, said straight sections of said heating element in one of said planes extending between corresponding edges of said dielectric plates while said straight sections in the other of said planes extending between the opposite corresponding edges of said dielectric mounting plates, said turn sections of said heating element encompassing the outside plane surfaces of said dielectric plates in spaced relation thereto whereby said mounting bar assemblies lie within said heating element at opposite ends thereof; and conductor means connected through said mounting plate to opposite ends of said heating element for supplying electric current to said heating element.
Claim 2
Dependent Claim
277 words
An electrical resistance-type heating device comprising: a mounting plate; spaced support bar assemblies secured at opposite ends of said mounting plate, each of said support bar assemblies having a conductor bar formed of an electrical current conducting material and a substantially flat, thin heating element mounting plate formed of a heat-resistant dielectric material secured to said conducting bar for supporting a heating element, the planar surfaces of said dielectric mounting plate being aligned in a direction parallel with the line of air flow past said heating device for providing minimum air resistance to air flow along said dielectric plate; a heating element formed of a straight electrical resistance type conductor shaped in a modified helix pattern having a plurality of straight sections interconnected at opposite ends of said heating element by curved turn sections whereby said straight sections are aligned in two spaced parallel planes, said straight sections in one of said planes being misaligned from said straight sections in the other of said planes, said heating element being mounted on said dielectric plates of said mounting bAr assemblies, said straight sections of said heating element in one of said planes extending between corresponding edges of said dielectric plates while said straight sections in the other of said planes extending between the opposite corresponding edges of said dielectric mounting plates, said turn sections of said heating element encompassing the outside plane surfaces of said dielectric plates in spaced relation thereto whereby said mounting bar assemblies lie within said heating element at opposite ends thereof; and conductor means connected through said mounting plate to opposite ends of said heating element for supplying electric current to said heating element.
Claim 3
Dependent Claim
24 words
A heating device in accordance with claim 1 wherein each of said mounting bar assemblies is supported on an insulator from said mounting plate.
Claim 4
Dependent Claim
45 words
A heating device in accordance with claim 2 wherein at least one of said conductor bars is electrically connected with one end of said heating element whereby said conductor bar comprises a part of the conductor means for supplying electric current to said heating element.
Claim 5
Dependent Claim
37 words
A heating device in accordance with claim 3 wherein the conductor means for supplying electric current to the other end of said heating element includes a fused lead assembly coupled by insulating means through said mounting plate.
Claim 6
Dependent Claim
173 words
An electrical resistance heating device for heating a column of air in a duct comprising: support means comprising spaced support bar assemblies including heat-resistant dielectric thin planar mounting panels aligned parallel to the direction of air flow past said device; and a heating element supported on said panels comprising a single strand of straight electrical resistance wire wound about said panels in a modified helix shape having straight sections arranged in two substantially parallel spaced planes extending between corresponding edges of said panels, said straight sections being parallel with each other and the straight sections in one plane being staggered relative to the straight sections of the other plane whereby a defined column of air passes across only one of said straight wire sections, and said single strand of wire includes semicircular sections connecting adjacent straight sections of said wire between opposite edges of each of said panels, said semicircular sections being disposed along outside faces of said panels and spaced outwardly from said panel faces for maximum air flow over said sections.
Claim 7
Dependent Claim
173 words
An electrical resistance heating device for heating a column of air in a duct comprising: support means comprising spaced support bar assemblies including heat-resistant dielectric thin planar mounting panels aligned parallel to the direction of air flow past said device; and a heating element supported on said panels comprising a single strand of straight electrical resistance wire wound about said panels in a modified helix shape having straight sections arranged in two substantially parallel spaced planes extending between corresponding edges of said panels, said straight sections being parallel with each other and the straight sections in one plane being staggered relative to the straight sections of the other plane whereby a defined column of air passes across only one of said straight wire sections, and said single strand of wire includes semicircular sections connecting adjacent straight sections of said wire between opposite edges of each of said panels, said semicircular sections being disposed along outside faces of said panels and spaced outwardly from said panel faces for maximum air flow over said sections.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |