US3684859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant heater
Assignee: Watlow Electric Manufacturing Co
•
Filing: 1971-02-04
•
Granted: 1972-08-15
•
Expires: 1991-02-04
Abstract
Abstract A radiant heater is described which includes channel-shaped radiating elements mounted side-by-side in a housing. The channel-shaped elements are metal and give high strength with light weight. The channel-shaped elements have a high emittance surface backed by an air space for uniform distribution across the surface through convection and radiation and are also backed by insulation to reduce back side losses. In construction, each channel-shaped element is formed from nested U-shaped members having a resistance heater positioned therebetween and electrically insulated from the U-shaped members by layers of dielectric material. Electrical connections to the resistance extend from the ends of the elements and may be connected across a suitable source of electrical energy for operation.
Inventors
- 👤 George B Desloge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:23
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/04; F24C7/043
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
255 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar being generally channelshaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, a heat insulating material positioned in the housing between the radiating bars and the base wall, an air space between the inner side of the radiating bars and the insulating material, and cross members between the sidewalls of the housing supporting the radiating bars, one of the cross members being positioned near the center of the housing and having an outwardly bowed portion extending across the housing transverse to the bars, the outwardly bowed portion having slots into which inturned flanges on the radiating bars fit, the flanges being apertured behind the outwardly bowed portion; and includinG a restraining pin extending behind the outwardly bowed portion and through the apertures in the bar flange whereby the bars cannot be withdrawn from the housing when the restraining pin is in place, and the ends of the bars are free to expand.
Claim 2
Dependent Claim
255 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar being generally channelshaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, a heat insulating material positioned in the housing between the radiating bars and the base wall, an air space between the inner side of the radiating bars and the insulating material, and cross members between the sidewalls of the housing supporting the radiating bars, one of the cross members being positioned near the center of the housing and having an outwardly bowed portion extending across the housing transverse to the bars, the outwardly bowed portion having slots into which inturned flanges on the radiating bars fit, the flanges being apertured behind the outwardly bowed portion; and includinG a restraining pin extending behind the outwardly bowed portion and through the apertures in the bar flange whereby the bars cannot be withdrawn from the housing when the restraining pin is in place, and the ends of the bars are free to expand.
Claim 3
Dependent Claim
184 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar being generally channel-shaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, the sidewalls of the housing and the flanges on the channel-shaped radiating bars being provided with aligned apertures near the centers thereof, a removable pin means positioned through the apertures to restrain the bars in the housing, a heat insulating material positioned in the housing between the radiating bars and the base wall, and an air space between the inner side of the radiating bars and the insulating material.
Claim 4
Dependent Claim
184 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar being generally channel-shaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, the sidewalls of the housing and the flanges on the channel-shaped radiating bars being provided with aligned apertures near the centers thereof, a removable pin means positioned through the apertures to restrain the bars in the housing, a heat insulating material positioned in the housing between the radiating bars and the base wall, and an air space between the inner side of the radiating bars and the insulating material.
Claim 5
Dependent Claim
216 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar being generally channel-shaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, cross members between the sidewalls of the housing supporting the radiating bars, a heat insulating material positioned in the housing between the radiating bars and the base wall, an air space between the inner side of the radiating bars and the insulating material, the housing having end caps at the ends of the base and sidewalls, said end caps extending over the ends of the radiating bars to cover the terminals and retain the bars in the housing, said end caps being movable away from the ends of the bars so that the bars can be withdrawn from the containing member.
Claim 6
Dependent Claim
216 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar being generally channel-shaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, cross members between the sidewalls of the housing supporting the radiating bars, a heat insulating material positioned in the housing between the radiating bars and the base wall, an air space between the inner side of the radiating bars and the insulating material, the housing having end caps at the ends of the base and sidewalls, said end caps extending over the ends of the radiating bars to cover the terminals and retain the bars in the housing, said end caps being movable away from the ends of the bars so that the bars can be withdrawn from the containing member.
Claim 7
Dependent Claim
224 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar generally channel-shaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, a cross member between the sidewalls of the housing supporting the radiating bars, a heat insulating material positioned in the housing between the radiating bars and the base wall, an air space between the inner side of the radiating bars and the insulating material, housing end caps at the ends of the base and sidewalls of the housing, said end caps extending over the ends of the radiating bars to cover the terminals and retain the bars in the housing, each end cap comprising side flanges which extend along the sidewalls, and means for detachably securing the side flanges of the end cap to the sidewalls of the containing member.
Claim 8
Dependent Claim
224 words
A radiant heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a plurality of radiating bars mounted side-by-side in the housing between the sidewalls and exposed outwardly through the open side thereof, each bar generally channel-shaped and having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surfaces of the bars being exposed outwardly from the open side of the housing, a cross member between the sidewalls of the housing supporting the radiating bars, a heat insulating material positioned in the housing between the radiating bars and the base wall, an air space between the inner side of the radiating bars and the insulating material, housing end caps at the ends of the base and sidewalls of the housing, said end caps extending over the ends of the radiating bars to cover the terminals and retain the bars in the housing, each end cap comprising side flanges which extend along the sidewalls, and means for detachably securing the side flanges of the end cap to the sidewalls of the containing member.
Claim 9
Dependent Claim
184 words
A radiaNt heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a radiating bar mounted lengthwise in the housing between the sidewalls and exposed outwardly through the open side thereof, the bar having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surface of the bar being exposed outwardly from the open side of the housing, means for retaining the bar in the housing, a heat insulating material positioned in the housing between the radiating bar and the base wall, a movable end cap at one end of the housing, said end cap extending over the end of the radiating bar and being movable away from the end of the bar so that the bar can be withdrawn from the housing, and means for locking the end cap to the housing.
Claim 10
Dependent Claim
184 words
A radiaNt heater comprising a housing having an open side, sidewalls, and a base wall connected to and extending between the sidewalls, the open side of the housing being located opposite to the base wall; a radiating bar mounted lengthwise in the housing between the sidewalls and exposed outwardly through the open side thereof, the bar having a high emittance outer surface portion and a resistance-type heating element extending along the inner side of the high emittance portion, and electrical insulation means between the element and the inner side of the bar, the high emittance surface of the bar being exposed outwardly from the open side of the housing, means for retaining the bar in the housing, a heat insulating material positioned in the housing between the radiating bar and the base wall, a movable end cap at one end of the housing, said end cap extending over the end of the radiating bar and being movable away from the end of the bar so that the bar can be withdrawn from the housing, and means for locking the end cap to the housing.
Claim 11
Dependent Claim
25 words
A radiant heater according to claim 5 wherein an air space is provided between the inner side of the radiating bars and the insulating material.
Claim 12
Dependent Claim
21 words
A radiant heater according to claim 5 wherein legs extend beyond the base wall of the housing for mounting the heater.
Claim 13
Dependent Claim
17 words
A radiant heater according to claim 3 wherein the end cap is hinged to the base wall.
Claim 14
Dependent Claim
33 words
A radiant heater according to claim 3 wherein the end cap has projections beyond the base wall of the containing member to form mounting legs for mounting the heater on a supporting structure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |