Patent US727793A successfully refreshed from Google Patents.
Patent US3838385A successfully refreshed from Google Patents.
US3838385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety plug
Assignee: Individual
•
Filing: 1972-11-24
•
Granted: 1974-09-24
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Expires: 1992-11-24
Abstract
Abstract An electrical safety plug with rotatable male blades. When inserted in a female socket, the blades are biased for rotation about their longitudinal axis so that when the plug is withdrawn the blades rotate and then lock in a position making it impossible to reinsert the plug in the socket.
Inventors
- 👤 J Bloomingdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:58
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A safety electrical plug comprising an insulating body, a pair of spaced elongate flat contact blades rotationally mounted in the body and extending therefrom for engagement with a socket type electrical outlet, contact means for connecting the blades to the conductors of a line cord, and drive means for rotating the blades about their longitudinal axes between a spaced parallel position for engagement with the socket outlet and a coplanar safety position, said drive means including biasing means urging the blades toward the safety position.
Claim 2
Dependent Claim
85 words
A safety electrical plug comprising an insulating body, a pair of spaced elongate flat contact blades rotationally mounted in the body and extending therefrom for engagement with a socket type electrical outlet, contact means for connecting the blades to the conductors of a line cord, and drive means for rotating the blades about their longitudinal axes between a spaced parallel position for engagement with the socket outlet and a coplanar safety position, said drive means including biasing means urging the blades toward the safety position.
Claim 3
Dependent Claim
19 words
A safety electrical plug as in claim 1 including lock means for securing the blades in the safety position.
Claim 4
Dependent Claim
57 words
A safety electrical plug as in claim 1 wherein said drive means includes a slide on the body having a push button extending outwardly of the body, a rotational drive connection between said slide and one of said blades, and a rotational drive connection between said one blade and the other blade whereby the blades rotate together.
Claim 5
Dependent Claim
24 words
A safety electrical plug as in claim 3 including a lock member, engageable with said slide to lock the same in a given position.
Claim 6
Dependent Claim
118 words
A safety electrical plug including an insulating housing; a pair of blade assemblies in said housing; each assembly including a portion rotatably mounted in the body, a flat contact blade extending outwardly of the body, means for forming an electrical connection with a conductor, and a gear meshed with the gear of the other assembly; a slide on the body having a push button on one end thereof extending outwardly of the body; a rotational drive connection between said slide and one assembly; and a spring biasing said slide to extend the push button from the body whereby depression of the push button rotates said blades in one direction and the spring rotates the blades in another direction.
Claim 7
Dependent Claim
118 words
A safety electrical plug including an insulating housing; a pair of blade assemblies in said housing; each assembly including a portion rotatably mounted in the body, a flat contact blade extending outwardly of the body, means for forming an electrical connection with a conductor, and a gear meshed with the gear of the other assembly; a slide on the body having a push button on one end thereof extending outwardly of the body; a rotational drive connection between said slide and one assembly; and a spring biasing said slide to extend the push button from the body whereby depression of the push button rotates said blades in one direction and the spring rotates the blades in another direction.
Claim 8
Dependent Claim
17 words
A safety electrical plug as in claim 5 including lock means for limiting movement of the slide.
Claim 9
Dependent Claim
94 words
A safety electrical plug including an insulating housing; a pair of elongate flat blades extending from the housing; rotatable mounting means in the housing for one of said blades whereby the blade may be rotated relative to the housing; means for forming an electrical connection between the blades and the conductors of a line cord; drive means for rotating said one blade about its longitudinal axis between two positions, said drive means including biasing means urging such blade towaRd one of such positions; and lock means for holding such blade in such one position.
Claim 10
Dependent Claim
94 words
A safety electrical plug including an insulating housing; a pair of elongate flat blades extending from the housing; rotatable mounting means in the housing for one of said blades whereby the blade may be rotated relative to the housing; means for forming an electrical connection between the blades and the conductors of a line cord; drive means for rotating said one blade about its longitudinal axis between two positions, said drive means including biasing means urging such blade towaRd one of such positions; and lock means for holding such blade in such one position.
References Cited (Backward Citations)
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Cited
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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) | 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 |