US4250868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Draft inducer/damper systems
Assignee: Individual
•
Filing: 1978-08-04
•
Granted: 1981-02-17
•
Expires: 1998-08-04
Abstract
Abstract A control system adapted to be secured to a solid fuel burner, such as a fireplace or a stove, to create and regulate forced fluid heat exchange and forced draft in the burner. The system comprises an electrical draft inducer/damper mounted in the burner flue, a fluid heat exchanger mounted over the burner firebox, and a control apparatus capable of deactivating the draft inducer/damper and the heat exchanger, automatically damping the flue, when combustion in the burner subsides. The control system, including the draft inducer/damper and heat exchanger, may be incorporated with a solid fuel burner, thus comprising a heating system.
Inventors
- 👤 Filmore O. Frye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
F; F24; F24B; F24B5/00; F24B5/02; F24B1/00; F24B1/18; F24B1/185; F24B7/00; F24B7/02; F24B7/025; Y; Y10; Y10S; Y10S236/00; Y10S236/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
A residential heating system comprising: a fireplace, a flue having an inlet end connected to the fireplace to receive the products of combustion produced in said fireplace and an exhaust end remote from the inlet end for discharging the products of combustion, a hot air heat exchanger associated with, and heated by, the fireplace, a first electrically operated blower means located in the exhaust end of the flue to create and maintain a forced draft through said fireplace, a second electrically operated blower means for creating and maintaining forced air through said heat exchanger; and, an electrical control circuit, including (a) a manually actuated switch for activating said first blower means, (b) a temperature responsive switch electrically connected to a first temperature sensing device located in said heat exchanger for deactivating said first blower means when the temperature in the heat exchanger drops below a first pre-determined temperature; and, (c) a second temperature responsive switch electrically connected to a second temperature sensing device located in the heat exchanger for activating and deactivating said second blower means in accordance with pre-determined temperatures in the heat exchanger.
Claim 2
Dependent Claim
185 words
A residential heating system comprising: a fireplace, a flue having an inlet end connected to the fireplace to receive the products of combustion produced in said fireplace and an exhaust end remote from the inlet end for discharging the products of combustion, a hot air heat exchanger associated with, and heated by, the fireplace, a first electrically operated blower means located in the exhaust end of the flue to create and maintain a forced draft through said fireplace, a second electrically operated blower means for creating and maintaining forced air through said heat exchanger; and, an electrical control circuit, including (a) a manually actuated switch for activating said first blower means, (b) a temperature responsive switch electrically connected to a first temperature sensing device located in said heat exchanger for deactivating said first blower means when the temperature in the heat exchanger drops below a first pre-determined temperature; and, (c) a second temperature responsive switch electrically connected to a second temperature sensing device located in the heat exchanger for activating and deactivating said second blower means in accordance with pre-determined temperatures in the heat exchanger.
Claim 3
Dependent Claim
28 words
A heating system according to claim 1 wherein the hot air heat exchanger is located inside the fireplace to circulate air from inside the residence through the fireplace.
Claim 4
Dependent Claim
41 words
A heating system according to claim 1 or 2 wherein the first temperature sensitive switch is set to deactivate the forced draft blower at a temperature below the temperature at which the second temperature responsive means deactivates the heat exchanger blower.
References Cited (Backward Citations)
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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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |