US4340267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety electrical plug
Assignee: Individual
•
Filing: 1980-06-13
•
Granted: 1982-07-20
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Expires: 2000-06-13
Abstract
Abstract A safety electrical plug comprising a casing formed by a pair of identical portions provided with cooperating cord insertion opening forming means, ribs and rib-support means, a spring-loaded blade covering member, a pair of plug blades supported by said rib-support means and extending through the covering member and a spring housing having a spring received therein to normally bias the blade covering member to its extended position.
Inventors
- 👤 Tokuji Nukaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:29
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/44; H01R13/447; H01R13/453; H01R13/4538
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
224 words
In a safety electrical plug comprising a casing formed by a pair of identical casing portions, each casing portion including cord insertion opening means at one end, a rib, rib-blade support means and second opening means at the other end, a pair of parallel and spaced plug blades supported on said rib-blade support means and extending out of said second opening means, a blade covering member slidably received in said second opening means and receiving said blades, said blade covering member having a pair of vertically elongated openings through which said blades extend, and a spring is interposed between said rib-blade support means and blade covering member to normally bias said blade covering member to the extended position; characterized in that a cylindrical spring housing receives the casing end of said spring and is open at one end to allow said spring to extend into said blade covering member, and has a pair of oppositely extending projections at said open end; and said blade covering member further has a circular opening between said vertically elongated openings for receiving said open end of the spring housing, a pair of horizontal grooves in communication with said circular opening for receiving said projections of the spring housing and a circular projection extending in the axial direction of the covering member to receive said spring on the projection.
Claim 2
Dependent Claim
224 words
In a safety electrical plug comprising a casing formed by a pair of identical casing portions, each casing portion including cord insertion opening means at one end, a rib, rib-blade support means and second opening means at the other end, a pair of parallel and spaced plug blades supported on said rib-blade support means and extending out of said second opening means, a blade covering member slidably received in said second opening means and receiving said blades, said blade covering member having a pair of vertically elongated openings through which said blades extend, and a spring is interposed between said rib-blade support means and blade covering member to normally bias said blade covering member to the extended position; characterized in that a cylindrical spring housing receives the casing end of said spring and is open at one end to allow said spring to extend into said blade covering member, and has a pair of oppositely extending projections at said open end; and said blade covering member further has a circular opening between said vertically elongated openings for receiving said open end of the spring housing, a pair of horizontal grooves in communication with said circular opening for receiving said projections of the spring housing and a circular projection extending in the axial direction of the covering member to receive said spring on the projection.
Claim 3
Dependent Claim
75 words
The safety electrical plug as set forth in claim 1, in which said rib-blade support means comprises a first rib-blade support extending across said casing portion and having a pair of spaced notches for receiving one end of said blades and a second rib-blade support extending across said casing portion inwardly spaced from said first rib-blade support and having a pair of notches in alignment with said pair of notches in the first rib-blade support.
Claim 4
Dependent Claim
45 words
The safety electrical plug as set forth in claim 1, in which each of said blades has a pair of oppositely directing notches each to be received in one of said pair of notches in the second rib-blade support of each of said casing portions.
Claim 5
Dependent Claim
20 words
The safety electrical plug as set forth in claim 1, wherein said cylindrical spring housing is of electrically insulating material.
Claim 6
Dependent Claim
24 words
The safety electrical plug as set forth in claim 1, wherein said pair of horizontal grooves is in communication with said vertically elongated openings.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |