US4201185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for heating by wood burning
Assignee: NORTHERN LEADER Inc A MN CORP
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Filing: 1978-08-21
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Granted: 1980-05-06
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Expires: 1998-08-21
Abstract
Abstract The wood burning heating means of the present invention utilizes a firebox having a grate adjacent the lower end and a flue opening adjacent the upper end thereof. A baffle is positioned immediately below the flue opening in such a manner as to deflect rising hot gases prior to their exit through the flue opening. A main draft opening provides communication of air below the grate to provide oxygen for the fire. A secondary draft opening is provided above the grate for introducing air in such a manner that oxygen will be provided immediately below the baffle to facilitate combustion of the gases which have accumulated adjacent the baffle.
Inventors
- 👤 Milton W. Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:27
CPC Classifications
F; F24; F24B; F24B7/00; F24B7/02; F24B7/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
301 words
A wood burning furnace comprising: a furnace housing having front and rear walls, opposite side walls, and top and bottom walls, a fire box within said furnace housing having a front wall joined to said front wall of said housing, the remainder of said firebox being spaced inwardly from at least some of said rear, side, top and bottom walls of said housing to define a circulation chamber therebetween whereby air may circulate in said circulation chamber around at least a portion of said firebox; said top wall of said housing having a hot air exhaust opening in communication with said circulation chamber; said housing being provided with an air intake opening adjacent the bottom thereof in communication with said circulation chamber; a flue extending through said housing and being in communication with the interior of said firebox through a flue opening in said firebox; a heat saving baffle positioned within said firebox below and in spaced relation to said flue opening so as to deflect rising hot air in said firebox and thereby delay said hot air temporarily prior to its exit through said flue opening; a main draft opening in said firebox adjacent the bottom thereof and providing communication of air from the exterior of said housing to the interior of said firebox; a secondary draft opening in said firebox above said main draft opening and providing communication of air from the exterior of said housing to the interior of said firebox, the vertical position of said secondary draft being such that fresh air is introduced to the firebox at a point spaced below said baffle sufficient distance to permit said fresh air to mix with and be heated by the hot gases rising within said firebox prior to the time said hot gases are deflected by said baffle.
Claim 2
Dependent Claim
301 words
A wood burning furnace comprising: a furnace housing having front and rear walls, opposite side walls, and top and bottom walls, a fire box within said furnace housing having a front wall joined to said front wall of said housing, the remainder of said firebox being spaced inwardly from at least some of said rear, side, top and bottom walls of said housing to define a circulation chamber therebetween whereby air may circulate in said circulation chamber around at least a portion of said firebox; said top wall of said housing having a hot air exhaust opening in communication with said circulation chamber; said housing being provided with an air intake opening adjacent the bottom thereof in communication with said circulation chamber; a flue extending through said housing and being in communication with the interior of said firebox through a flue opening in said firebox; a heat saving baffle positioned within said firebox below and in spaced relation to said flue opening so as to deflect rising hot air in said firebox and thereby delay said hot air temporarily prior to its exit through said flue opening; a main draft opening in said firebox adjacent the bottom thereof and providing communication of air from the exterior of said housing to the interior of said firebox; a secondary draft opening in said firebox above said main draft opening and providing communication of air from the exterior of said housing to the interior of said firebox, the vertical position of said secondary draft being such that fresh air is introduced to the firebox at a point spaced below said baffle sufficient distance to permit said fresh air to mix with and be heated by the hot gases rising within said firebox prior to the time said hot gases are deflected by said baffle.
Claim 3
Dependent Claim
43 words
A furnace according to claim 1 wherein said firebox is spaced inwardly from all of said top, bottom, rear, and side walls of said housing wherein said circulation chamber extends above, below, to the rear and to each opposite side of said firebox.
Claim 4
Dependent Claim
69 words
A furnace according to claim 1 wherein said front walls of said firebox and said housing are provided with a door opening providing communication from the exterior of said furnace to the interior of said firebox; a door being positioned in covering relation over said door openings; said main draft opening being below said door opening and secondary draft opening being adjacent the upper edge of said door opening.
Claim 5
Dependent Claim
66 words
A furnace according to claim 3 wherein a smoke damper is positioned between said secondary draft opening and the interior of said firebox to prevent smoke from exiting said secondary draft opening, said damper having a lower edge below said secondary draft opening whereby air passes from said secondary draft opening below said lower edge of said damper and thence into the interior of said firebox.
Claim 6
Dependent Claim
53 words
A furnace according to claim 4 wherein said door opening has an upper edge and said door has an upper edge, said secondary draft opening comprising at least one hole in said door adjacent said upper edge thereof, said damper having an upper edge connected adjacent said upper edge of said door opening.
Claim 7
Dependent Claim
42 words
A furnace according to claim 5 wherein said damper is hinged about a horizontal axis adjacent the upper edge thereof whereby said damper may be pivoted inwardly about said horizontal axis during insertion of wood into said firebox through said door opening.
Claim 8
Dependent Claim
56 words
A furnace according to claim 6 wherein a draft adjustment means is mounted over said hole in said door, said adjustment means comprising a plate mounted over said hole for sliding movement from a first position exposing said hole to the atmosphere to a second position covering said hole and preventing air from entering said hole.
Claim 9
Dependent Claim
64 words
A furnace according to claim 2 wherein a fan is connected to said air intake opening for circulating air through said circulation chamber and outwardly through said hot air exhaust opening, a thermostat positioned within said circulation chamber, and means connecting said thermostat to said fan for controlling the actuation and deactuation of said fan in response to temperature changes within said circulation chamber.
Claim 10
Dependent Claim
90 words
A furnace according to claim 8 wherein a draft control means is mounted on said housing and comprises a power means, a chain connected to said power means and a main draft door over said main draft opening, and temperature sensing means within said circulation chamber and responsive to temperature changes within said circulation chamber to actuate and deactuate said power means whereby actuation of said power means causes said chain to move said main draft door for controlling the amount of air permitted to enter said main draft opening.
Claim 11
Dependent Claim
216 words
A wood burning furnace comprising: a furnace housing having a firebox therein, said firebox having upper and lower ends, a flue opening in said firebox adjacent said upper end thereof; a flue extending through said housing and being in communication with the interior of said firebox through said flue opening; a grate within said firebox and spaced downwardly from said upper end of said firebox for supporting burning fuel whereby the heated gases from said burning fuel will rise and exit from said firebox through said flue opening; a main draft opening in said housing positioned to provide communication of air from the exterior of said housing to the interior of said firebox adjacent said grate; a heat saving baffle within said housing and positioned in spaced relation below said flue opening and spaced relation above said grate so as to deflect rising partially combusted gases and thereby delay their exit through said flue opening; a secondary draft opening within said housing positioned in spaced relation above said grate and spaced relation below said baffle whereby the venturi effect of said rising gases will draw fresh air into said firebox through said secondary draft opening and will mix with and preheat said fresh air prior to the time said rising gases are delayed by said baffle.
Claim 12
Dependent Claim
216 words
A wood burning furnace comprising: a furnace housing having a firebox therein, said firebox having upper and lower ends, a flue opening in said firebox adjacent said upper end thereof; a flue extending through said housing and being in communication with the interior of said firebox through said flue opening; a grate within said firebox and spaced downwardly from said upper end of said firebox for supporting burning fuel whereby the heated gases from said burning fuel will rise and exit from said firebox through said flue opening; a main draft opening in said housing positioned to provide communication of air from the exterior of said housing to the interior of said firebox adjacent said grate; a heat saving baffle within said housing and positioned in spaced relation below said flue opening and spaced relation above said grate so as to deflect rising partially combusted gases and thereby delay their exit through said flue opening; a secondary draft opening within said housing positioned in spaced relation above said grate and spaced relation below said baffle whereby the venturi effect of said rising gases will draw fresh air into said firebox through said secondary draft opening and will mix with and preheat said fresh air prior to the time said rising gases are delayed by said baffle.
Claim 13
Dependent Claim
66 words
A furnace according to claim 10 wherein a smoke damper is positioned between said secondary draft opening and the interior of said firebox to prevent smoke from exiting said secondary draft opening, said damper having a lower edge below said secondary draft opening whereby air passes from said secondary draft opening below said lower edge of said damper and thence into the interior of said firebox.
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |