US4186432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp for use in subterranean applications
Assignee: Individual
•
Filing: 1977-11-21
•
Granted: 1980-01-29
•
Expires: 1997-11-21
Abstract
Abstract A lamp for use in subterranean galleries such as mines in which the cold-cathode discharge tube is received in a housing which, in turn, is removably mounted in a receptacle and is held in place by a ring clamping a flange of the housing against a flange of the receptacle. The housing may be provided with a translucent cover so that the housing can be removed and replaced as a unit. A reed switch on the receptacle cooperates with a magnet on the housing to deenergize the terminals of the housing upon its removal. The terminals of the discharge tube are embedded in an insulating potting mass within the housing.
Inventors
- 👤 Martin Hamacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:23
CPC Classifications
F; F21; F21V; F21V31/00; F21V19/00; F21V19/04; F21V23/00; F21V23/04; F21V25/00; F21V25/02; F21V25/04; F21V25/12; F21Y; F21Y2103/00; F21Y2103/30; F21Y2103/37
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A cold-cathode lamp assembly comprising: a receptacle open at one side; a lamp unit removably receivable in said receptacle and electrically connected therewith, said unit including: a housing open at one side, a cold-cathode discharge tube replaceably received in said housing, a cover for closing said side of said housing, and means for sealing said cover to said housing to render said unit dust-free; means for securing said unit in said receptacle; a pair of terminals on said receptacle connectable with said unit; and contactless switch means for de-energizing said terminals upon removal of said unit from said receptacle, said unit having an actuator for open-circuiting said contactless switch means without contact therewith upon displacement of said unit away from said contactless switch means.
Claim 2
Dependent Claim
124 words
A cold-cathode lamp assembly comprising: a receptacle open at one side; a lamp unit removably receivable in said receptacle and electrically connected therewith, said unit including: a housing open at one side, a cold-cathode discharge tube replaceably received in said housing, a cover for closing said side of said housing, and means for sealing said cover to said housing to render said unit dust-free; means for securing said unit in said receptacle; a pair of terminals on said receptacle connectable with said unit; and contactless switch means for de-energizing said terminals upon removal of said unit from said receptacle, said unit having an actuator for open-circuiting said contactless switch means without contact therewith upon displacement of said unit away from said contactless switch means.
Claim 3
Dependent Claim
59 words
The assembly defined in claim 1 wherein said receptacle is formed with a peripheral flange and said unit has an outwardly extending flange resting upon said flange of said receptacle, said means for securing said unit in said receptacle including a frame extending around said cover and clamping said flange of said unit against said flange of said receptacle.
Claim 4
Dependent Claim
34 words
The assembly defined in claim 2 wherein said unit is provided at the side of said housing opposite the open side thereof with a cast base at least partially surrounding ends of said tube.
Claim 5
Dependent Claim
29 words
The assembly defined in claim 3 wherein said cover is affixed to said housing by a U-section profile member engaging outwardly extending flanges on said cover and said housing.
Claim 6
Dependent Claim
31 words
The assembly defined in claim 1 wherein said switch means includes a reed switch in said receptacle and said actuator is a magnet on said unit cooperating with said reed switch.
Claim 7
Dependent Claim
71 words
The assembly defined in claim 5 wherein said receptacle has an outwardly extending peripheral flange and said cover and said housing are each provided with outwardly extending peripheral flanges connected together by a U-profile member resting upon said flange of said receptacle, said cover having a dome surrounded by a frame connected to said flange of said receptacle and clamping said member and said cover against said flange of said receptacle.
Claim 8
Dependent Claim
84 words
A cold-cathode lamp assembly comprising: a receptacle open at one side and provided opposite said side with a pair of terminals; a unit comprising a dust-free housing and a cold-cathode tube enclosed in said housing, said unit being receivable in said receptacle and connectable to said terminals; and switch means operable upon removal of said unit to de-energize said terminal, said switch means including a reed switch received in said receptacle and said unit being provided with a permanent magnet operating said reed switch.
Claim 9
Dependent Claim
84 words
A cold-cathode lamp assembly comprising: a receptacle open at one side and provided opposite said side with a pair of terminals; a unit comprising a dust-free housing and a cold-cathode tube enclosed in said housing, said unit being receivable in said receptacle and connectable to said terminals; and switch means operable upon removal of said unit to de-energize said terminal, said switch means including a reed switch received in said receptacle and said unit being provided with a permanent magnet operating said reed switch.
Claim 10
Dependent Claim
17 words
The assembly defined in claim 7, further comprising a transformer in said receptacle connected to said terminals.
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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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |