US4356537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting fixture retainer hook
Assignee: Thomas Industries Inc
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Filing: 1980-08-15
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Granted: 1982-10-26
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Expires: 2000-08-15
Abstract
Abstract In a recessed lighting fixture intended to be laid onto horizontal flanges of inverted T-shaped rails of a grid-type ceiling, the rails having a stem with a bulb defining shoulders below the upper edge of the stem, the fixture having a housing with metal end plates, a hook is formed integrally with one of the end plates. The hook extends across and embraces the bulb. The hook is either formed with a nose projecting in a direction toward the end plate and beneath a shoulder defined by the bulb, or a tab, integral with the end plate, is provided that has a free upper edge projecting from the end plate toward and beneath a shoulder facing the end plate.
Inventors
- 👤 Leo G. Stahlhut
- 👤 Willard R. Garnett
- 👤 Lewis W. Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:28
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/006; F; F21; F21V; F21V21/00; F21V21/02; F21V21/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
In a recessed lighting fixture adapted to be laid onto horizontal flanges of inverted T-shaped rails of a grid-type ceiling, said rails having a stem with a bulb defining shoulders below the upper edge of said stem, said fixture having a housing with metal end plates, the improvement comprising a hook formed integrally with and intermediate the span of a planar section of one of said end plates and adapted to project at substantially right angles to the said planar section and to extend across and embrace said bulb, and means integral with said end plate for projecting beneath one of said shoulders wholly on one side of said stem.
Claim 2
Dependent Claim
110 words
In a recessed lighting fixture adapted to be laid onto horizontal flanges of inverted T-shaped rails of a grid-type ceiling, said rails having a stem with a bulb defining shoulders below the upper edge of said stem, said fixture having a housing with metal end plates, the improvement comprising a hook formed integrally with and intermediate the span of a planar section of one of said end plates and adapted to project at substantially right angles to the said planar section and to extend across and embrace said bulb, and means integral with said end plate for projecting beneath one of said shoulders wholly on one side of said stem.
Claim 3
Dependent Claim
36 words
The improvement of claim 1 wherein the means for projecting beneath one of said shoulders is a nose integral with said hook and projecting, when said hook is in bulb embracing position, toward said end plate.
Claim 4
Dependent Claim
61 words
The improvement of claim 1 wherein the means for projecting beneath one of said shoulders is a tab formed in said end plate and integral with said plate along a lower edge of said tab and adapted to be bent out along said lower edge from said end plate with its upper edge projecting beneath a shoulder facing said end plate.
Claim 5
Dependent Claim
19 words
The improvement of claim 3 wherein said tab is positioned between and laterally spaced from two of said hooks.
Claim 6
Dependent Claim
45 words
The improvement of claim 3 wherein the tab is provided with a screwdriver blade-receiving slot whereby the tab can be bent from the end plate to its position to project beneath said shoulder and bent back from beneath the shoulder for release of said fixture.
References Cited (Backward Citations)
US4086480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |