US3838269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Globe and globe guard for a lighting fixture
Assignee: Cooper Industries LLC
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Filing: 1974-02-05
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Granted: 1974-09-24
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Expires: 1994-02-05
Abstract
Abstract A retaining structure for a grid-type globe guard for a lighting fixture, consisting of a internally threaded mounting ring and an externally threaded split guard surrounding a frangible globe, the globe having a beveled flange and the split guard having a chamfered surface which coacts with the bevel to expand the threads into a seizing engagement with the threaded mounting ring as the guard is screwed into place to affix the globe.
Inventors
- 👤 A Bogdanovs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:30
CPC Classifications
F; F21; F21V; F21V15/00; F21V15/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
169 words
A self-locking globe and globe guard assembly for a lighting fixture comprising: a. an internally threaded cuplike structure integral with the fixture, b. an open-ended globe having a generally cylindrical shape and having an external circumferential beveled surface adjacent its open end with the bevel extending outwardly toward the open end of the globe, and c. a cagelike globe guard having ribs joining a split ring structure in a unitary assembly, the said ring having external threads complementary to the internal threads on said cup, the said ring having an internal beveled surface complementary to the beveled surface on said globe when said guard is assembled over said globe, d. whereby when said guard is assembled around said globe and threaded into said cup the coacting beveled surfaces on the globe and the guard coact to cam said split ring radially outward to produce a tight coaction of the mating threads to provide a tight friction lock between the threads to prevent rotation of the guard in the cup.
Claim 2
Dependent Claim
169 words
A self-locking globe and globe guard assembly for a lighting fixture comprising: a. an internally threaded cuplike structure integral with the fixture, b. an open-ended globe having a generally cylindrical shape and having an external circumferential beveled surface adjacent its open end with the bevel extending outwardly toward the open end of the globe, and c. a cagelike globe guard having ribs joining a split ring structure in a unitary assembly, the said ring having external threads complementary to the internal threads on said cup, the said ring having an internal beveled surface complementary to the beveled surface on said globe when said guard is assembled over said globe, d. whereby when said guard is assembled around said globe and threaded into said cup the coacting beveled surfaces on the globe and the guard coact to cam said split ring radially outward to produce a tight coaction of the mating threads to provide a tight friction lock between the threads to prevent rotation of the guard in the cup.
Claim 3
Dependent Claim
24 words
The assembly of claim 1 wherein the guard and the cup are provided with cast threads to increase the friction between the mating threads.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |