Patent US4787365A successfully refreshed from Google Patents.
US4787365A
Expired / Lapsed
US
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Double walled fireplace insert and method for loading from the outside
Assignee: Individual
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Filing: 1987-11-12
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Granted: 1988-11-29
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Expires: 2007-11-12
Abstract
Abstract A double walled fireplace insert is shown with an inner firebox and an outer shell to provide convection air channels between the parallel walls of the inner and outer units. A front panel is integral with the outer shell, and it covers the front of the insert. This front panel has room air intake vents that open into the said air channels, and warmed air outlet vents that open into the room to be heated by this fireplace. There is a circulating fan positioned within the convection air channels for governing the air movement through the said channels. Each of the rear walls of the insert has a pivoted heavy metal door to accommodate the rear loading of the interior firebox when there is a vertical masonry chimney built on the outside of the residence over the fireplace insert installed through the outer wall with a door opening in the lower portion thereof for gaining access to the two rear doors of the fireplace insert so that firewood may be loaded from the outside into the firebox through the open rear doors, and ashes and cinders may be collected and removed through these two rear door openings from the outside after the fire has subsided. A lock mechanism is provided for the outer rear door to prevent unauthorized entry by unknown persons.
Inventors
- 👤 Dwight E. Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:36
CPC Classifications
F; F24; F24B; F24B7/00; F24B7/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
237 words
A method of loading firewood into an interior firebox of a double walled fireplace insert comprising an inner firebox containing a rear wall, side walls, a top wall and a bottom wall and an outer shell containing a rear wall, side walls, a top wall, a bottom wall, and a front wall wherein the insert is provided with convection air channels between the adjacent walls of the inner firebox and the outer shell, wherein the rear wall of the inner firebox has a swinging rear door, and the rear wall of the outer shell has a hinged rear door to allow the inner rear door to swing open, and a vertical masonry chimney is built on the outside of a building in which the fireplace insert is installed, wherein the chimney has a door opening in its lower portion for allowing access to the two rear doors so they may swing open to load firewood into the firebox, as well as for cleaning out ashes and cinders that may be formed, wherein a lock mechanism is provided for the rear door of the outer shell to prevent unauthorized entry by unknown persons wherein the rear door of the outer shell is also provided with thermal insulation to reduce heat loss from the inner firebox and a thermal door gasket to prevent cool outside air from mixing with the convection air that flows around the convection air channels.
Claim 2
Independent Claim
237 words
A method of loading firewood into an interior firebox of a double walled fireplace insert comprising an inner firebox containing a rear wall, side walls, a top wall and a bottom wall and an outer shell containing a rear wall, side walls, a top wall, a bottom wall, and a front wall wherein the insert is provided with convection air channels between the adjacent walls of the inner firebox and the outer shell, wherein the rear wall of the inner firebox has a swinging rear door, and the rear wall of the outer shell has a hinged rear door to allow the inner rear door to swing open, and a vertical masonry chimney is built on the outside of a building in which the fireplace insert is installed, wherein the chimney has a door opening in its lower portion for allowing access to the two rear doors so they may swing open to load firewood into the firebox, as well as for cleaning out ashes and cinders that may be formed, wherein a lock mechanism is provided for the rear door of the outer shell to prevent unauthorized entry by unknown persons wherein the rear door of the outer shell is also provided with thermal insulation to reduce heat loss from the inner firebox and a thermal door gasket to prevent cool outside air from mixing with the convection air that flows around the convection air channels.
Claim 3
Dependent Claim
190 words
A double walled fireplace insert comprising an inner firebox containing a rear wall, side walls, a top wall and a bottom wall and an outer shell containing a rear wall, side walls, a top wall, a bottom wall, and a front wall wherein the insert is provided with convection air channels between the adjacent walls of the inner firebox and outer shell, a front panel integral with the front wall of the outer shell for covering the front of said insert, said panel having room air intake vents that open into said air channels, warm air outlet vents, and a circulating fan positioned within the convection air channels for governing the air movement through said channels, each of the adjacent rear walls having a pivoted heavy metal door to accommodate the rear loading of the inner firebox of the insert from the outside of the building, wherein the insert is located within a vertical outside chimney, wherein firewood may be loaded from the outside into the firebox through the open rear doors, and ashes and cinders may be collected and removed through these two rear door openings from the outside.
Claim 4
Dependent Claim
190 words
A double walled fireplace insert comprising an inner firebox containing a rear wall, side walls, a top wall and a bottom wall and an outer shell containing a rear wall, side walls, a top wall, a bottom wall, and a front wall wherein the insert is provided with convection air channels between the adjacent walls of the inner firebox and outer shell, a front panel integral with the front wall of the outer shell for covering the front of said insert, said panel having room air intake vents that open into said air channels, warm air outlet vents, and a circulating fan positioned within the convection air channels for governing the air movement through said channels, each of the adjacent rear walls having a pivoted heavy metal door to accommodate the rear loading of the inner firebox of the insert from the outside of the building, wherein the insert is located within a vertical outside chimney, wherein firewood may be loaded from the outside into the firebox through the open rear doors, and ashes and cinders may be collected and removed through these two rear door openings from the outside.
Claim 5
Dependent Claim
38 words
The double walled fireplace insert as recited in claim 2 wherein the heavy metal door of the rear wall of the outer shell is provided with thermal insulation to reduce heat loss through and around the rear door.
Claim 6
Dependent Claim
61 words
The double walled fireplace insert as recited in claim2 wherein the heavy metal door of the rear wall of the outer shell has a hinge means for opening the heavy metal door arranged along its bottom edge, while the heavy metal door of the rear wall of the inner firebox also has a hinge means arranged along one side edge thereof.
Claim 7
Dependent Claim
83 words
The double walled fireplace insert as recited in claims 1 or 2 wherein the top wall of the outer shell and the top wall of the inner firebox are provided with a vertical flue duct directed into said chimney, a movable damper associated with said flue duct, a manual control means connected to said damper and an electrical switching means attached to the front wall of the outer shell for controlling said circulating fan within the convection air channels of said fireplace insert.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |