EP0174774A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Heating apparatus
Assignee: QED Intellectual Property Ltd
•
Filing: 1985-08-29
•
Granted: —
•
Expires: 2005-08-29
Abstract
Abstract 57 A heating unit includes two tubular tungsten-halogen lamps (1, 2), each having a tungsten filament (3, 4). The lamps (1, 2) are supported within a ring (7) of ceramic fibre material and the unit is preferably mounted beneath an infra-red-transmissive cooktopto define a hotplate area (8) of a cooking hob. A control circuit provides a range of discrete power outputs of the lamps (1, 2), each power output corresponding to a power control setting set by a user of the cooking hob. The circuit includes a phase control circuit (19) for switching power to the lamps (1, 2) at a predetermined phase angle to achieve one or more of the lower power outputs.
Inventors
- 👤 Peter William Crossley
- 👤 Bernard Frederick Fellerman
- 👤 Stephen John Newton
- 👤 David Wellcome
- 👤 Graham Howlett Goodchild
- 👤 Rashiklal Patel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:53
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/68; H05B3/74; H05B3/744
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
Heating apparatus including a number of sources (1, 2) of infra-red radiation and a control circuit for providing a number of discrete power outputs of said sources (1, 2), and characterised in that said control circuit includes means (19) for switching power to said sources (1, 2) at a predetermined phase angle to achieve one or more of said power outputs.
Claim 2
Dependent Claim
61 words
Heating apparatus including a number of sources (1, 2) of infra-red radiation and a control circuit for providing a number of discrete power outputs of said sources (1, 2), and characterised in that said control circuit includes means (19) for switching power to said sources (1, 2) at a predetermined phase angle to achieve one or more of said power outputs.
Claim 3
Dependent Claim
32 words
Heating apparatus as claimed in Claim 1 wherein said sources (1, 2) of infra-red radiation each comprises an infra-red lamp (1) having a tungsten filament (3) supported within a quartz envelope (5).
Claim 4
Dependent Claim
29 words
Heating apparatus as claimed in Claim 2 wherein said control circuit is arranged to switch the lamp filaments (1) into series and/or parallel configurations to generate said power outputs.
Claim 5
Dependent Claim
48 words
Heating apparatus as claimed in Claim 3 wherein said control circuit is arranged to connect said means (19) for switching power to said sources (1, 2) at a predetermined phase angle into one or more of said configurations to achieve said one or more of said power outputs.
Claim 6
Dependent Claim
54 words
Heating apparatus as claimed in Claim 2, 3 and 4 wherein said control circuit comprises a dual control arrangement for energising one or more lamps (31, 32) located in an inner region (36) of said apparatus independently of one or more lamps (33, 34) located in a region peripheral of said inner region (36).
Claim 7
Dependent Claim
63 words
Heating apparatus as claimed in any one of claims 2 to 5 wherein said apparatus is arranged to be mounted beneath an infra-red-transmissive cooktop of a cooking hob so that said lamps (66) provide a hotplate area (8) of said cooktop, said lamps (66) being shaped into a curved configuration to provide efficient illumination over substantially the whole of said hotplate area (8).
Claim 8
Dependent Claim
28 words
Heating apparatus as claimed in Claim 6 wherein said lamps (66) are inclined, at least at their point of closest approach to each other, away from said cooktop.
Claim 9
Dependent Claim
40 words
Heating apparatus as claimed in Claim 6 or 7 wherein a coating (72), partially reflective of infra-red radiation generated by said lamps (66), is applied to a region of the envelopes of said lamps facing the underside of said cooktop.
Claim 10
Dependent Claim
39 words
Heating apparatus as claimed in Claim 6, 7 or 8 wherein an infra-red-reflective coating (73) is applied to a region of the envelopes of said lamps (66) on the opposing side to that facing the underside of said cooktop.
References Cited (Backward Citations)
US3355574A
Cited
GB2132060A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.