US4461242A — Means for heating water by wood burning

Claim 1

Independent Claim 415 words

A wood burning furnace comprising: a furnace housing having front and rear walls, opposite side walls, and top and bottom walls, a firebox 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 boiler chamber therebetween, said top wall of said housing having an inlet opening in communication with said boiler chamber; said rear wall of said housing having an inlet opening in communication with said boiler chamber; a flue extending through said housing and said boiler chamber and extending approximately half way into said firebox and being in spaced relation below said top wall of said firebox; said front walls of said firebox and said housing being provided with a door opening having an upper edge and a lower edge and providing communication from the exterior of said firebox to the interior of said firebox; a door having upper and lower edges and being positioned in covering relation over said door opening; a main draft opening in said firebox adjacent the bottom thereof and below said door opening, said main draft opening 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, said secondary draft opening comprising at least one hole in said door adjacent said upper edge of said door; smoke damper means positioned between said secondary draft opening and the interior of said firebox to prevent smoke from exiting said secondary draft opening, said damper means having an upper edge and a lower edge, said upper edge of said damper means being hinged about a horizontal axis adjacent said upper edge of said door opening whereby said damper means may be pivoted inwardly about said horizontal axis during insertion of wood into said firebox through said door opening; said lower edge of said damper means being spaced downwardly from said flue and said secondary draft opening and upwardly above said main draft opening whereby fresh air will pass from said secondary draft opening downwardly below said lower edge of said damper means and will mix with and be heated by hot gases which are rising within said firebox before said hot gases reach said flue.

Claim 2

Dependent Claim 415 words

A wood burning furnace comprising: a furnace housing having front and rear walls, opposite side walls, and top and bottom walls, a firebox 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 boiler chamber therebetween, said top wall of said housing having an inlet opening in communication with said boiler chamber; said rear wall of said housing having an inlet opening in communication with said boiler chamber; a flue extending through said housing and said boiler chamber and extending approximately half way into said firebox and being in spaced relation below said top wall of said firebox; said front walls of said firebox and said housing being provided with a door opening having an upper edge and a lower edge and providing communication from the exterior of said firebox to the interior of said firebox; a door having upper and lower edges and being positioned in covering relation over said door opening; a main draft opening in said firebox adjacent the bottom thereof and below said door opening, said main draft opening 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, said secondary draft opening comprising at least one hole in said door adjacent said upper edge of said door; smoke damper means positioned between said secondary draft opening and the interior of said firebox to prevent smoke from exiting said secondary draft opening, said damper means having an upper edge and a lower edge, said upper edge of said damper means being hinged about a horizontal axis adjacent said upper edge of said door opening whereby said damper means may be pivoted inwardly about said horizontal axis during insertion of wood into said firebox through said door opening; said lower edge of said damper means being spaced downwardly from said flue and said secondary draft opening and upwardly above said main draft opening whereby fresh air will pass from said secondary draft opening downwardly below said lower edge of said damper means and will mix with and be heated by hot gases which are rising within said firebox before said hot gases reach said flue.

Claim 3

Dependent Claim 42 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 boiler chamber extends above, to the rear and to each opposite side of said firebox.

Claim 4

Dependent Claim 61 words

A furnace according to claim 2 wherein a pump is connected to said intake opening for circulating water through said boiler chamber and outwardly through said outlet opening an aquastat positioned within said boiler chamber, and means connecting said aquastat to said pump for controlling the actuation and deactuation of said pump in response to temperature changes within said boiler chamber.

Claim 5

Dependent Claim 89 words

A furnace according to claim 1 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, temperature sensing means within said boiler chamber, and responsive to temperature changes within said boiler chamber to acturate and deacturate 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 6

Dependent Claim 61 words

A furnace according to claim 1 wherein water is within said circulation chamber, a tap water heating device being mounted to one of said walls of said furnace housing, said tap water heating device including a coil tube extending within said circulation chamber and coupling means outside said furnace housing for connecting said coil tube to a tap water circulation system.

Claim 7

Dependent Claim 56 words

A furnace according to claim 1 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 8

Dependent Claim 282 words

A wood burning furnace comprising: a furnace housing having a firebox therein, said firebox having upper and lower ends, a flue extending through said housing and into said firebox and terminating in an inner end located approximately at the vertical centerline of said firebox; 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; 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; said flue being positioned in spaced relation below the top of said firebox and above said grate so as to deflect rising partially combusted gases and thereby delay their exit through said flue; a secondary draft opening within said housing positioned in spaced relation above said grate and spaced relation below said flue; a smoke damper positioned between said secondary draft opening and the interior of said firebox to prevent smoke from exiting said secondary draft opening, said smoke damper being hinged about a horizontal axis and having a lower edge below said secondary draft opening whereby fresh air passes from said secondary draft opening below said lower edge of said damper and will mix with and be heated by said rising gases prior to the time that said gases reach said flue; the relative positions of said secondary draft opening, said main draft opening, said smoke damper, and said flue causing said rising gases to create a hot spot adjacent said flue, said hot spot having a temperature of approximately 1100° F.

Claim 9

Dependent Claim 282 words

A wood burning furnace comprising: a furnace housing having a firebox therein, said firebox having upper and lower ends, a flue extending through said housing and into said firebox and terminating in an inner end located approximately at the vertical centerline of said firebox; 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; 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; said flue being positioned in spaced relation below the top of said firebox and above said grate so as to deflect rising partially combusted gases and thereby delay their exit through said flue; a secondary draft opening within said housing positioned in spaced relation above said grate and spaced relation below said flue; a smoke damper positioned between said secondary draft opening and the interior of said firebox to prevent smoke from exiting said secondary draft opening, said smoke damper being hinged about a horizontal axis and having a lower edge below said secondary draft opening whereby fresh air passes from said secondary draft opening below said lower edge of said damper and will mix with and be heated by said rising gases prior to the time that said gases reach said flue; the relative positions of said secondary draft opening, said main draft opening, said smoke damper, and said flue causing said rising gases to create a hot spot adjacent said flue, said hot spot having a temperature of approximately 1100° F.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-07-24	1988-01-23	1988-07-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-07-24	1992-01-23	1992-07-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-07-24	1996-01-23	1996-07-24	$7700.00	Window Closed / Lapsed

Means for heating water by wood burning

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