Claims
- 1. A heating assembly comprising:
- (a) at least one tungsten halogen lamp emissive of infra-red radiation, operative at a temperature within a range from 1800 to 3000.degree. K.,
- (b) a layer of glass ceramic material covering said at least one lamp and permitting infra-red radiation emitted by said at least one lamp to emerge from the assembly through said layer, and having a predetermined maximum operating temperature,
- (c) a member comprising non-metallic thermally insulative material disposed beneath said at least one lamp and said layer, said at least one lamp being located between the member and the layer,
- (d) reflective means associated with said member to reflect towards said layer infra-red radiation initially emitted from said at least one lamp in a direction away from said layer,
- (e) switching means for selectively energizing and de-energizing said at least one lamp,
- (f) a rod member made of a thermally expansive material, said rod member being arranged, when said glass ceramic material reaches said maximum operating temperature, to activate said switching means, causing said switching means to de-energize said at least one lamp, and
- (g) means for shielding said rod member from incident infra-red radiation generated by said at least one lamp to enable said rod member to respond primarily to an operating temperature of said layer of glass ceramic material, whereby the rod member monitors the operating temperature of the layer of glass ceramic material and controls, by way of said switching means, energizing of said at least one lamp to prevent the operating temperature of said layer of glass ceramic material from exceeding said predetermined maximum temperature.
- 2. A heating assembly comprising:
- (a) at least one tungsten halogen lamp emissive of infra-red radiation, operative at a temperature within a range from 1800 to 3000.degree. K.,
- (b) a layer of glass ceramic material covering said at least one lamp and permitting infra-red radiation emitted by said at least one lamp to emerge from the assembly through said layer, and having a predetermined maximum operating temperature,
- (c) a member comprising non-metallic thermally-insulative material disposed beneath said at least one lamp and said layer, said at least one lamp being located between the member and the layer,
- (d) reflective means associated with said member to reflect back towards said layer infra-red radiation initially emitted from said at least one lamp in a direction away from said layer,
- (e) switching means for relatively energizing and de-energizing said at least one lamp,
- (f) a rod member made of a thermally expansive material, said rod member being arranged, when the glass ceramic material reaches said maximum operating temperature, to activate said switching means, causing said switching means to de-energize said at least one lamp, and
- (g) means consisting of an infra-red reflective coating for shielding said rod member from incident infra-red radiation generated by said at least one lamp to enable said rod member to respond primarily to an operating temperature of said layer of glass ceramic material, whereby the rod member monitors the operating temperature of the layer of glass ceramic material and controls, by way of said switching means, energization of said at least one lamp to prevent the operative temperature of said layer of glass ceramic material from exceeding said predetermined maximum temperature.
- 3. A heating assembly as claimed in claim 2 wherein said coating consists of a metallic oxide material.
Priority Claims (3)
Number |
Date |
Country |
Kind |
8236797 |
Dec 1982 |
GBX |
|
8308105 |
Mar 1983 |
GBX |
|
8320717 |
Aug 1983 |
GBX |
|
Parent Case Info
This is a division of application Ser. No. 049,049, filed May 11, 1987, which is a continuation-in-part of U.S. Ser. No. 563,930, filed Dec. 21, 1983, now abandoned.
US Referenced Citations (38)
Foreign Referenced Citations (23)
Number |
Date |
Country |
2164162 |
Dec 1971 |
DEX |
2500586 |
Jul 1976 |
DEX |
2719706 |
Nov 1978 |
DEX |
2809131 |
Sep 1979 |
DEX |
3004187 |
Aug 1980 |
DEX |
1315694 |
Dec 1962 |
FRX |
263254 |
Dec 1926 |
GBX |
241554 |
Jan 1927 |
GBX |
398093 |
Sep 1933 |
GBX |
443494 |
Feb 1936 |
GBX |
735000 |
Aug 1955 |
GBX |
908793 |
Oct 1962 |
GBX |
1002598 |
Jun 1966 |
GBX |
1132367 |
Oct 1968 |
GBX |
1133468 |
Nov 1968 |
GBX |
1273023 |
May 1972 |
GBX |
1282656 |
Jul 1972 |
GBX |
1289016 |
Sep 1972 |
GBX |
2005824 |
Apr 1979 |
GBX |
2061679 |
May 1981 |
GBX |
2069300 |
Aug 1981 |
GBX |
2071969 |
Sep 1981 |
GBX |
1599452 |
Oct 1981 |
GBX |
Non-Patent Literature Citations (4)
Entry |
Extract from advertising literature for Microtherm. |
Extract from advertising literature by Corning, 77210 Fontainebleau, Avon, France. |
"Drying Products Made Easy", Nalco, Oct. 1943. |
"Facts About Modern Infrared and its Advantages to Food Processors", Fostoria, Apr. 1961. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
49049 |
May 1987 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
563930 |
Dec 1983 |
|