Patent US3918121A successfully refreshed from Google Patents.
US3918121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door lock
Assignee: Individual
•
Filing: 1973-08-20
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Granted: 1975-11-11
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Expires: 1993-08-20
Abstract
Abstract A door lock adapted to fit over the door hinge and clamp the hinge plates to prevent pivotal movement of the plates about the hinge pin to prevent opening of the door.
Inventors
- 👤 John R Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:22
CPC Classifications
E; E05; E05D; E05D11/00; E05D11/10; E05D11/1007; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
A door lock adapted to slide onto and cooperate with a door hinge having hinge plates which are fastened one to a door and one to a door frame, coMprising at least one tubular section having a longitudinal slot with opposed spaced edges, the spacing between said edges being substantially equal to the combined thickness of the hinge plates, whereby when the door is closed the tubular section can be slid onto the hinge with the edges of the slot impinging upon the outer surface of the hinge plates to clamp the plates and prevent pivotal movement of the hinge plates about the hinge pin, whereby force applied to open the door will tend to pull the hinge plates from the door and frame thereby moving the outer edge of the door against the opposite side of the door frame for providing further locking action to prevent opening of the door, said opposed spaced edges being bent endwardly at one end of said tubular section for limiting the longitudinal movement of said section on said hinge and at least on rib extending around the periphery of said tubular section to provide rigidity therefore.
Claim 2
Dependent Claim
193 words
A door lock adapted to slide onto and cooperate with a door hinge having hinge plates which are fastened one to a door and one to a door frame, coMprising at least one tubular section having a longitudinal slot with opposed spaced edges, the spacing between said edges being substantially equal to the combined thickness of the hinge plates, whereby when the door is closed the tubular section can be slid onto the hinge with the edges of the slot impinging upon the outer surface of the hinge plates to clamp the plates and prevent pivotal movement of the hinge plates about the hinge pin, whereby force applied to open the door will tend to pull the hinge plates from the door and frame thereby moving the outer edge of the door against the opposite side of the door frame for providing further locking action to prevent opening of the door, said opposed spaced edges being bent endwardly at one end of said tubular section for limiting the longitudinal movement of said section on said hinge and at least on rib extending around the periphery of said tubular section to provide rigidity therefore.
Claim 3
Dependent Claim
179 words
A door lock adapted to slide onto and cooperate with a door hinge having hinge plates to prevent opening of a door which is hinge supported in a doorway, comprising a pair of tubular sections each having a longitudinal slot with opposed spaced edges, the spacing between said edges being substantially equal to the combined thickness of the hinge plates, whereby when the door is closed the tubular section can be slid onto the hinge with the edges of the slot impinging upon the outer surface of the hinge plates to clamp the plates and prevent pivotal movement of the hinge plates about the hinge pin, whereby force applied to open the door tends to separate the hinge from the door and doorway thereby moving the outer edge of the door against the opposite side of the doorway for further locking action, means at one end of each of said tubular sections for limiting the longitudinal movement of said section on said hinge, and means cooperating with said tubular sections for holding the two sections together on the hinge.
Claim 4
Dependent Claim
179 words
A door lock adapted to slide onto and cooperate with a door hinge having hinge plates to prevent opening of a door which is hinge supported in a doorway, comprising a pair of tubular sections each having a longitudinal slot with opposed spaced edges, the spacing between said edges being substantially equal to the combined thickness of the hinge plates, whereby when the door is closed the tubular section can be slid onto the hinge with the edges of the slot impinging upon the outer surface of the hinge plates to clamp the plates and prevent pivotal movement of the hinge plates about the hinge pin, whereby force applied to open the door tends to separate the hinge from the door and doorway thereby moving the outer edge of the door against the opposite side of the doorway for further locking action, means at one end of each of said tubular sections for limiting the longitudinal movement of said section on said hinge, and means cooperating with said tubular sections for holding the two sections together on the hinge.
Claim 5
Dependent Claim
14 words
A door lock as in claim 2 wherein said holding means comprises spring means.
Claim 6
Dependent Claim
37 words
A door lock as in claim 2 wherein the slot in each tubular section extends to one end of the tubular section and to a point spaced from the other end to leave a solid tubular section.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |