US5102345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for electrical cord sockets
Assignee: University of Manitoba
•
Filing: 1991-06-10
•
Granted: 1992-04-07
•
Expires: 2011-06-10
Abstract
Abstract The present invention describes a safety device for a socket portion of an electrical cord. The safety feature involves the positioning of a conducting ring around the positive slot on the receiving socket. The conducting ring is grounded, and when used in conjunction with a ground fault interrupter, prevents the completion of an electrical circuit through the child's saliva from the positive contact in the socket and the flesh of the child's mouth.
Inventors
- 👤 Richard S. Stanwick
- 👤 Trevor Maguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:06
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/66; H01R13/70; H01R13/713; H01R13/7135; H01R13/44; Y; Y10; Y10S; Y10S439/00; Y10S439/911
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
An electrical extension cord comprising an electrical cable having a first conductor for connecting to a live electrical supply, second conductor for connection to a neutral return and a third conductor for connection to ground, a socket portion connected to said electrical cable and having a receiving surface defining three openings therein and means to receive the conventional pins of a household electrical plug, each of said openings having a contact terminal therein for engaging a respective one of the pins of the plug and arranged for connection to a respective one of the conductors, a conductive member mounted on the surface so as to substantially surround that one of the openings which has the contact terminal thereof arranged for connection to said live electrical supply with the conductive member exposed at the surface for electrical connection to any saliva running across the surface towards said one of the openings, the conductive member closely surrounding said one of the openings and so as to surround only said one of the openings, and means connecting the conductive member to said third conductor for connection to ground.
Claim 2
Dependent Claim
185 words
An electrical extension cord comprising an electrical cable having a first conductor for connecting to a live electrical supply, second conductor for connection to a neutral return and a third conductor for connection to ground, a socket portion connected to said electrical cable and having a receiving surface defining three openings therein and means to receive the conventional pins of a household electrical plug, each of said openings having a contact terminal therein for engaging a respective one of the pins of the plug and arranged for connection to a respective one of the conductors, a conductive member mounted on the surface so as to substantially surround that one of the openings which has the contact terminal thereof arranged for connection to said live electrical supply with the conductive member exposed at the surface for electrical connection to any saliva running across the surface towards said one of the openings, the conductive member closely surrounding said one of the openings and so as to surround only said one of the openings, and means connecting the conductive member to said third conductor for connection to ground.
Claim 3
Dependent Claim
21 words
The extension cord according to claim 1 wherein the conductive member has a surface thereof substantially flush with the receiving surface.
Claim 4
Dependent Claim
18 words
The extension cord according to claim 1 wherein the conductive member fully surrounds said one of the openings.
Claim 5
Dependent Claim
53 words
The extension cord according to claim 1 wherein the conductive member is spaced from said contact terminal of said one of the openings by insulating material forming a part of the socket portion and is spaced from the other of the openings by the insulating material forming a part of said socket portion.
Claim 6
Dependent Claim
46 words
The extension cord according to claim 1 wherein said one of the openings comprises a mouth of a channel extending into the socket portion, the conductive member being spaced outwardly from the opening such that the mouth of the channel is spaced from the conductive member.
Claim 7
Dependent Claim
54 words
The extension cord according to claim 1 wherein the electrical cable is connected to an electrical supply outlet including a live electrical supply connector, a neutral return connector and a ground connector and including a ground fault interrupter circuit responsive to flow of current through said ground connector to disconnect said live electrical supply.
References Cited (Backward Citations)
US3686534A
Cited
US3728581A
Cited
US4568133A
Cited
US4751603A
Cited
US4688135A
Cited
US5013891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |