Patent US3729603A successfully refreshed from Google Patents.
US3729603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hinge plate switch structure
Assignee: LAWRENCE BROTHERS INC US
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Filing: 1971-08-26
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Granted: 1973-04-24
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Expires: 1991-08-26
Abstract
Abstract The present invention relates generally to improvements in door hinge structures and more particularly to improvements in door hinges adapted to control electrical circuits. The hinge disclosed herein includes a pair of hingedly connected hinge plates or leaves having in association therewith contact means for opening and closing an electrical circuit, one hinge leaf being mountable upon the vertical edge of the door and the other mountable upon a door frame.
Inventors
- 👤 R Foltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:00
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/02; H01H3/16; H01H3/161; H01H3/162
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
An electrical circuit control hinge device including first and second pivotally connected hinge plates, the first of said plates being apertured to accommodate fastener elements such as screw members for attachment to the vertical edge of a swingable door member and the second being apertured to accommodate fastener elements such as screw members for attachment in a fixed position upon a vertical door frame, electrical circuit control means mounted on said second hinge plate including an electrically nonconductive control member projectable from the exposed surface of said second hinge plate and shiftable transversely of said second hinge plate as an incident to the approach thereto of said first hinge plate, means for connecting said control means with an electrical conductor, and means for biasing said control member toward the projecting position thereof.
Claim 2
Dependent Claim
132 words
An electrical circuit control hinge device including first and second pivotally connected hinge plates, the first of said plates being apertured to accommodate fastener elements such as screw members for attachment to the vertical edge of a swingable door member and the second being apertured to accommodate fastener elements such as screw members for attachment in a fixed position upon a vertical door frame, electrical circuit control means mounted on said second hinge plate including an electrically nonconductive control member projectable from the exposed surface of said second hinge plate and shiftable transversely of said second hinge plate as an incident to the approach thereto of said first hinge plate, means for connecting said control means with an electrical conductor, and means for biasing said control member toward the projecting position thereof.
Claim 3
Dependent Claim
32 words
An electrical circuit control hinge device as set forth in claim 1, electrical circuit control means includes switch means operable as an incident to the movement of said electrically nonconductive shiftable member.
Claim 4
Dependent Claim
34 words
An electrical circuit control hinge device as set forth in claim 1, wherein said electrical circuit control means includes a switch spring adapted to be engaged and moved by said electrically nonconductive shiftable member.
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |