US4751624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety ceiling fixture with heat sensor
Assignee: Genlyte Thomas Group LLC
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Filing: 1987-12-14
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Granted: 1988-06-14
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Expires: 2007-12-14
Abstract
Abstract A recessed incandescent ceiling light fixture is provided with a heat sensing device for interrupting current flow to an incandescent bulb mounted in the fixture. The top wall of the fixture is encompassed within a cover member which is spaced from the top wall, the cover member including a depending skirt which outwardly laps the sidewalls of the fixture and defines a circumferential slot between the fixture walls and cover member. A heat sensor is mounted on the surface of the cover member in the area between the top wall of the housing and cover member. The cover member is mounted to the housing at spaced points whereby heat transfer from the housing to the cover member is minimized.
Inventors
- 👤 Neil Russo
- 👤 Kingsley Chan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:05
CPC Classifications
F; F21; F21V; F21V25/00; F21V25/10; Y; Y10; Y10S; Y10S362/00; Y10S362/802
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
A recessed incandescent ceiling light fixture having heat sensing means comprising a housing having side walls and a generally planar top wall, a reflector assembly mounted in said housing, socket means in said housing for the reception of an incandescent bulb, said housing having a junction box mounted on an external surface thereof, a metallic cover member disposed in parallel spaced relation to said top wall portion, said cover member including a depending skirt portion overlapping and spaced from said side walls, said skirt portion and side wall defining there between a downwardly directed circumferential slot, attchement means spanning said slot and connecting said cover member and housing at a plurality of spaced positions, and a heat sensor member fixed to said cover member and disposed in the space between said cover member and top wall, said sensor member and cover member being in heat conductive relation whereby said sensor is maintained substantially at the temperature of said cover member.
Claim 2
Dependent Claim
160 words
A recessed incandescent ceiling light fixture having heat sensing means comprising a housing having side walls and a generally planar top wall, a reflector assembly mounted in said housing, socket means in said housing for the reception of an incandescent bulb, said housing having a junction box mounted on an external surface thereof, a metallic cover member disposed in parallel spaced relation to said top wall portion, said cover member including a depending skirt portion overlapping and spaced from said side walls, said skirt portion and side wall defining there between a downwardly directed circumferential slot, attchement means spanning said slot and connecting said cover member and housing at a plurality of spaced positions, and a heat sensor member fixed to said cover member and disposed in the space between said cover member and top wall, said sensor member and cover member being in heat conductive relation whereby said sensor is maintained substantially at the temperature of said cover member.
Claim 3
Dependent Claim
49 words
A light fixture in accordance with claim 1 wherein said sensor member includes a metallic body portion, said sensor member having said body portion in heat conductive relation to said cover member, said sensor being spaced above and clear of contact with said top wall portion of said housing.
Claim 4
Dependent Claim
28 words
An apparatus in accordance with claim 2 wherein said attachment means provides minimal metal to metal contact between said side walls of said hosing and said skirt portion.
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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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |