Patent US2497561A successfully refreshed from Google Patents.
Patent US3896785A successfully refreshed from Google Patents.
US3896785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireplace heating channel
Assignee: Individual
•
Filing: 1974-01-21
•
Granted: 1975-07-29
•
Expires: 1994-01-21
Abstract
Abstract This invention is designed to increase the heating efficiency of an existing conventional fireplace. The device consists of a hollow metal air conveying channel which is designed to fit closely against the multiple inside walls of an existing fireplace in combination with a hollow metal flame guide vane that connects the upper inside portions of the side arms of the air channel. The vane is triangular in cross section and is positioned so as to form a hot gas passageway between the rear surface of the vane and the upper portion of the center panel of the air channel. The channel and vane are heated by the fire and room air is forced to make multiple horizontal passes through the fireplace heating channel, at option through the vane, by a blower. The heated room air being vented back into the room. The device is readily insertible in an existing fireplace and does not require modification to the fireplace structure and does not interfere with its normal functioning. Because of this feature the device is compatible with a broad range of existing fireplace sizes and types.
Inventors
- 👤 Clifford H Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:40
CPC Classifications
F; F24; F24B; F24B1/00; F24B1/18; F24B1/185; F24B1/188; F24B1/1885; F24B1/1886
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
320 words
A free standing fireplace heating channel comprising a hollow metaL air conveying channel in combination with a flame guide vane, insertible into an existing conventional fireplace without requiring modification to the fireplace structure, said channel having a center panel and at least one forward facing channel arm adapted to fit against multiple inside walls of a fireplace, said air channel having adjoining walls exposed to the heat from the fire with corresponding rear walls spaced therefrom and connected by spacer means so as to form a suitable air channel for conveying room air to be heated by the fire, means for forcing room air into a lower portion of said forward facing channel arm by a single blower, and baffle means to direct the forced circulating room air to make multiple horizontal passes through said channel prior to exiting back into a room from an upper portion of a forward facing channel arm as useful heating air, said guide vane being attached to an upper inside portion of said forward facing arm of said air channel and extending horizontally to a symmetrical position on an opposite side, said hollow metal guide vane having a triangular cross section with the base horizontal and the apex pointing downward toward the fire and positioned forward of the center panel of the air channel so as to form an upward converging passageway for the hot fire gases, said passageway being formed by the upper portion of a near vertical surface of the center panel and the opposing rearward slanting surface of the guide vane wherein the width of the horizontal base of the guide vane is constructed wide enough to almost block the remainder of the fireplace throat leaving only a small gap between the forward facing edge of the vane and the inside front surface of the fireplace throat, and insulation means for reducing heat losses from the horizontal base of said vane.
Claim 2
Dependent Claim
320 words
A free standing fireplace heating channel comprising a hollow metaL air conveying channel in combination with a flame guide vane, insertible into an existing conventional fireplace without requiring modification to the fireplace structure, said channel having a center panel and at least one forward facing channel arm adapted to fit against multiple inside walls of a fireplace, said air channel having adjoining walls exposed to the heat from the fire with corresponding rear walls spaced therefrom and connected by spacer means so as to form a suitable air channel for conveying room air to be heated by the fire, means for forcing room air into a lower portion of said forward facing channel arm by a single blower, and baffle means to direct the forced circulating room air to make multiple horizontal passes through said channel prior to exiting back into a room from an upper portion of a forward facing channel arm as useful heating air, said guide vane being attached to an upper inside portion of said forward facing arm of said air channel and extending horizontally to a symmetrical position on an opposite side, said hollow metal guide vane having a triangular cross section with the base horizontal and the apex pointing downward toward the fire and positioned forward of the center panel of the air channel so as to form an upward converging passageway for the hot fire gases, said passageway being formed by the upper portion of a near vertical surface of the center panel and the opposing rearward slanting surface of the guide vane wherein the width of the horizontal base of the guide vane is constructed wide enough to almost block the remainder of the fireplace throat leaving only a small gap between the forward facing edge of the vane and the inside front surface of the fireplace throat, and insulation means for reducing heat losses from the horizontal base of said vane.
Claim 3
Dependent Claim
32 words
A fireplace heating channel as in claim 1, wherein the air channel equipped with a flame guide vane has three sides adapted to fit against the three inside walls of the fireplace.
Claim 4
Dependent Claim
196 words
A fireplace heating channel equipped with a flame guide vane as in claim 1, wherein a three sided air channel having first and second forward facing channel arms is adapted to fit against the three inside walls of an existing fireplace, wherein the three sided air channel has one horizontal baffle means that divides the first forward facing channel arm into an upper and lower air passageway and said baffle means is extended to also divide the rear or center panel of said channel into corresponding passages, such that room air enters the bottom portion of the first forward facing channel arm and then flows through the lower passageway of said center panel and turns upward and reverses flow in the second channel arm and subsequently returns to a room via the upper passageway so formed by the baffle means, further, said guide vane being fastened symmetrically to the inside walls of upper portions of the first and second forward facing channel arms, said vane having a hollow interior vented into the hollow interior of said channel arms at the point of attachment whereby said vane becomes an additional conveying channel for heating circulating room air.
Claim 5
Dependent Claim
35 words
A fireplace heating channel as in claim 1, wherein the air channel equipped with a flame guide vane, has two adjoining sides adapted to fit against two of the three inside walls of a fireplace.
Claim 6
Dependent Claim
33 words
A fireplace heating channel equipped with a flame guide vane as in claim 1, wherein a two sided air channel has one baffle means to obtain two horizontal passages for heating room air.
Claim 7
Dependent Claim
152 words
A fireplace heating channel equipped with a flame guide vane as in claim 1, wherein a three sided air channel having first and second forward facing channel arms is adapted to fit against the three inside walls of an existing fireplace, wherein said three sided air channel has two horizontal baffle means to obtain three horizontal passageways for heating room air in said channel and providing therewith for venting of heated room air from the upper forward portion oF an opposite channel arm from that in which a lower air inlet is placed, said guide vane being fastened symmetrically to the inside walls of upper portions of the said first and second forward facing arms of said air channel, said vane having a hollow interior vented into the hollow interior of said channel arms at the point of attachment whereby said vane becomes an additional conveying channel for heating circulating room air.
Claim 8
Dependent Claim
180 words
A fireplace heating channel equipped with a flame guide vane as in claim 1, wherein a three sided air channel having first and second forward facing channel arms is adapted to fit against the three inside walls of an existing fireplace wherein the three sided air channel has one horizontal baffle means that divides the first channel arm into an upper and lower air passageway and said baffle means is extended to also divide the rear or center panel of said channel into corresponding passages, such that room air enters the bottom portion of the first forward facing channel arm and then flows through the lower passageway of said center panel and turns upward and reverses flow in the second channel arm and subsequently returns to a room from the upper portion of the first channel arm via the upper passageway so formed by the baffle means, further, said guide vane being fastened symmetrically to inside upper portions of said first and second forward facing channel arms and having no fluid communication with the interior of said air channel arms.
References Cited (Backward Citations)
US32283A
Cited
US1377108A
Cited
US1488195A
Cited
US2052643A
Cited
US2362526A
Cited
US2359197A
Cited
US3190282A
Cited
US3762391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |