Patent US3965397A successfully refreshed from Google Patents.
US3965397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for preventing an electrical shock hazard
Assignee: AT&T Inc
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Filing: 1975-05-01
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Granted: 1976-06-22
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Expires: 1995-05-01
Abstract
Abstract An interlocking safety arrangement for electrically powered apparatus utilizes a conventional disengagable electrical connector and a standard fuse holder which are physically arranged so that the connector must be disengaged from its receptacle to gain access to the fuse holder. Since the electrical connector supplies power to the apparatus, disengagement disconnects the power and prevents the possibility of an electrical shock hazard from the terminals associated with the fuse.
Inventors
- 👤 George David Pearsall, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:29
CPC Classifications
H; H02; H02B; H02B1/00; H02B1/18; Y; Y10; Y10S; Y10S439/00; Y10S439/911; Y10S439/954
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A safety arrangement for electrically powered apparatus, said apparatus having at least two surfaces having regions that are substantially planar, each region having an orientation corresponding to one of two planes that intersect forming a dihedral angle, the arrangement comprising disengagable electrical connecting means mounted to one of said regions for powering said apparatus, fusing means mounted to the other of said regions and being in circuit with said connecting means, and said connecting means and said fusing means being mounted in close proximity to each other and the dihedral angle having a predetermined value such that said connecting means directly blocks withdrawl of said fusing means, to said fusing means is obstructed by said connecting means making disengagement of said electrical connecting means necessary to gain access to said fusing means, thereby insuring that said apparatus is disconnected from a powering potential before said fusing means is contacted.
Claim 2
Dependent Claim
149 words
A safety arrangement for electrically powered apparatus, said apparatus having at least two surfaces having regions that are substantially planar, each region having an orientation corresponding to one of two planes that intersect forming a dihedral angle, the arrangement comprising disengagable electrical connecting means mounted to one of said regions for powering said apparatus, fusing means mounted to the other of said regions and being in circuit with said connecting means, and said connecting means and said fusing means being mounted in close proximity to each other and the dihedral angle having a predetermined value such that said connecting means directly blocks withdrawl of said fusing means, to said fusing means is obstructed by said connecting means making disengagement of said electrical connecting means necessary to gain access to said fusing means, thereby insuring that said apparatus is disconnected from a powering potential before said fusing means is contacted.
Claim 3
Dependent Claim
45 words
A safety arrangement in accordance with claim 1 wherein said two surfaces are walls of a cavity formed in the rear of said apparatus, and said cavity is of sufficient size to prevent protrusion of said electrical connecting means from the rear of said apparatus.
Claim 4
Dependent Claim
24 words
A safety arrangement in accordance with claim 2 wherein said fusing means comprises at least one panel mounted fuse holder containing an appropriate fuse.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |