US4584987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system using wood as the principal source of energy
Assignee: Individual
•
Filing: 1982-12-21
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Granted: 1986-04-29
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Expires: 2002-12-21
Abstract
Abstract A high efficiency fireplace with effective heat recovery capability for heating purposes and for heat storage. A fireplace boiler made of interconnected heat exchanger elements using sheet metal stamping technology, preferably corrugated metal stamped panels defining a plurality of water flow paths for circulating heat exchanging water. A wood burning domestic heating system using such an improved fireplace is also disclosed with suitable temperature control devices and thermal energy storage systems.
Inventors
- 👤 Remo Rotili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:50
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/183; F24B1/185; F24B1/187; F24D; F24D11/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
228 words
A fireplace hot water boiler comprising a plurality of heat exchange elements suitably coupled together for circulating a liquid such as water therethrough and juxtaposed to define a totally enclosing, free-standing structure defining a radiant section heat exchanger in which a fire is located, an outlet in a top of said radiant section heat exchanger through which all of the combustion gases pass, and a convection section heat exchanger connected to said outlet and through which the combustion gases pass, each heat exchanger element comprising an inner wall, a coextensive and generally parallel outer wall peripherally welded to said inner wall, and duct means for the water circulating thorugh the space defined between said inner and outer walls, the inner and outer walls of each heat exchanger element being made of gauge sheet metal of steel at least one of which being configured by embossing, stamping or otherwise with a pluraity of regularly and generally vertically distributed contact regions where said inner and outer walls contact one another and are welded together to provide generally vertical water flow paths between consecutive contact regions, each heat exchanger element being designed and constructed to withstand the working pressure of domestic pressurized hot water heating systems and the thermal stresses of wood burning, said fireplace hot water boiler further comprising pipe means for suitable connected with a hot water heat load.
Claim 2
Dependent Claim
228 words
A fireplace hot water boiler comprising a plurality of heat exchange elements suitably coupled together for circulating a liquid such as water therethrough and juxtaposed to define a totally enclosing, free-standing structure defining a radiant section heat exchanger in which a fire is located, an outlet in a top of said radiant section heat exchanger through which all of the combustion gases pass, and a convection section heat exchanger connected to said outlet and through which the combustion gases pass, each heat exchanger element comprising an inner wall, a coextensive and generally parallel outer wall peripherally welded to said inner wall, and duct means for the water circulating thorugh the space defined between said inner and outer walls, the inner and outer walls of each heat exchanger element being made of gauge sheet metal of steel at least one of which being configured by embossing, stamping or otherwise with a pluraity of regularly and generally vertically distributed contact regions where said inner and outer walls contact one another and are welded together to provide generally vertical water flow paths between consecutive contact regions, each heat exchanger element being designed and constructed to withstand the working pressure of domestic pressurized hot water heating systems and the thermal stresses of wood burning, said fireplace hot water boiler further comprising pipe means for suitable connected with a hot water heat load.
Claim 3
Dependent Claim
160 words
A fireplace hot water boiler as defined in claim 1 wherein said radiant section heat exchanger comprises a lower back panel and two lower lateral panels each of which being defined by a different one of said heat exchanger elements, wherein said convection section heat exchanger comprises an upper front panel, an upper back panel spaced from said upper front panel and two spaced apart sides cooperating with said upper front panel and with said upper back panel to define a smoke chamber, each of said upper front panel and of said upper back panel being defined by a different one of said heat exchanger elements and wherein said water flow paths define, in each heat exchanger element, a plurality of upright water flow paths interconnected at their opposite ends by a lower manifold flow path and by an upper manifold flow path, said fireplace hot water boiler also being a gas-tight structure between the fireplace opening and the chimney.
Claim 4
Dependent Claim
107 words
A fireplace hot water boiler as defined in claim 2 wherein said upper back panel is made of two contiguous heat exchanger elements serially connected together and disposed one above the other, the lower one extending upwardly and forwardly from the upper edge of said lower back panel, and the upper one of said last mentioned head exchanging elements extending upwardly and rearwardly generally parallel to said upper front panel, wherein the lower manifold flow paths of said radiant section heat exchanger are serially connected together, and wherein said radiant section heat exchanger comprises a rectangular frame of steel defining the fireplace opening of said fireplace boiler.
Claim 5
Dependent Claim
106 words
A fireplace hot water boiler as defined in claim 1 wherein said radiant section heat exchanger and said convection section heat exchanger are formed by a single heat exchanging assembly comprising four heat exchanger elements welded together, namely two side panels, an upper front panel inclined rearwardly, and a back panel cooperating with said side panels and said upper front panel to form a gas-tight smoke chamber leading from the radiant section heat exchanger to the chimney of said fireplace and wherein the water flow paths of each side panel extend upwardly and merge into one another in the upper, narrower region of said side panel.
Claim 6
Dependent Claim
83 words
A fireplace hot water boiler as defined in claim 4 wherein said back panel comprises a lower region which is essentially planar and vertical, an upper region which is essentially planar and rearwardly inclined in the upward direction and a curved intermediate region which extends essentially upwardly and forwardly between said lower and upper regions, wherein said upper front panel is planar and essentially parallel to the upper region of said back panel and wherein said front panel is trapezoid in plan view.
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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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |