US4057873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door hinge coupling device
Assignee: Individual
•
Filing: 1976-03-25
•
Granted: 1977-11-15
•
Expires: 1996-03-25
Abstract
Abstract Projections in door hinge plates penetrate and bear against cooperating slots in opposite plates of door hinges to prevent a locked door from being removed from a doorjamb by removing the hinge pintles.
Inventors
- 👤 Rudolph Bursani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
E; E05; E05D; E05D11/00; E05D11/0018; E05D11/0027; E05D2011/0045; E05D5/00; E05D5/02; E05D5/04; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
In a hinge of the type having two hinge plates pivotally connected about a pintle axis to each other by a pin, the improvement which comprises, an elongated slot of uniform width having opposite ends with a longitudinal axis formed in one of said hinge plates, said axis being perpendicular to said pintle axis, and a projection bent outwardly from said other hinge plate along a line perpendicular to said pintle axis to extend normally therefrom penetrating said slot to bear firmly against both ends of said slot whenever said hinge is closed, whereby said projection has two oppositely disposed contacting surfaces, one contacting surface being no greater than a right angle and the angle of the second contacting surface being an acute angle relative to said other hinge plate, both said contacting surfaces bearing against opposite ends of said slot when said hinge is closed.
Claim 2
Dependent Claim
146 words
In a hinge of the type having two hinge plates pivotally connected about a pintle axis to each other by a pin, the improvement which comprises, an elongated slot of uniform width having opposite ends with a longitudinal axis formed in one of said hinge plates, said axis being perpendicular to said pintle axis, and a projection bent outwardly from said other hinge plate along a line perpendicular to said pintle axis to extend normally therefrom penetrating said slot to bear firmly against both ends of said slot whenever said hinge is closed, whereby said projection has two oppositely disposed contacting surfaces, one contacting surface being no greater than a right angle and the angle of the second contacting surface being an acute angle relative to said other hinge plate, both said contacting surfaces bearing against opposite ends of said slot when said hinge is closed.
Claim 3
Dependent Claim
20 words
A hinge as specified in claim 1, wherein said projection extends substantially beyond said slot when said hinge is closed.
References Cited (Backward Citations)
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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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |