US3971582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door latch
Assignee: Individual
•
Filing: 1974-11-13
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Granted: 1976-07-27
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Expires: 1994-11-13
Abstract
Abstract A safety latch for holding a door in its locked position or in a partially open position to enhance security. A bar for holding the door in either position is provided together with keepers cooperating with the bar to perform the holding functions. The said bar may be mounted to take the place of one hinge pin.
Inventors
- 👤 Brooks Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:54
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/003; E05C17/00; E05C17/02; E05C17/04; E05C17/12; E05C17/16; E05C17/166; Y; Y10; Y10T; Y10T292/00; Y10T292/23; Y10T292/28; Y10T292/289
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
In a door structure that includes a frame, and a door having a hinge edge and an opposite latch edge, a safety latch for holding said door against opening, comprising: a bar swingably supported at one of its ends on said door structure, a keeper mounted on said frame adjacent said latch edge of the door, said keeper being formed with a horizontally outwardly opening slot for receiving the opposite end of said bar therealong, said slot having a vertically offset portion for receiving said opposite end therein to prevent opening of the door, a second keeper swingably connected to said first mentioned keeper, said second keeper being formed with an elongated slot having an open end adjacent said first mentioned keeper and in alignment with the slot in said first mentioned keeper when said keepers are in substantially coplanar relation, whereby said opposite end of said bar may be moved along said elongated slot to the inner end thereof to permit said door to be partially opened to a position against said bar.
Claim 2
Dependent Claim
174 words
In a door structure that includes a frame, and a door having a hinge edge and an opposite latch edge, a safety latch for holding said door against opening, comprising: a bar swingably supported at one of its ends on said door structure, a keeper mounted on said frame adjacent said latch edge of the door, said keeper being formed with a horizontally outwardly opening slot for receiving the opposite end of said bar therealong, said slot having a vertically offset portion for receiving said opposite end therein to prevent opening of the door, a second keeper swingably connected to said first mentioned keeper, said second keeper being formed with an elongated slot having an open end adjacent said first mentioned keeper and in alignment with the slot in said first mentioned keeper when said keepers are in substantially coplanar relation, whereby said opposite end of said bar may be moved along said elongated slot to the inner end thereof to permit said door to be partially opened to a position against said bar.
Claim 3
Dependent Claim
33 words
A latch according to claim 1 wherein said second keeper is provided with a stop adapted to engage said bar for holding the latter in said offset position when said door is closed.
Claim 4
Dependent Claim
31 words
A latch according to claim 1 wherein said second keeper is adapted to be swung to a position against said frame to permit removal of bar from said first mentioned slot.
Claim 5
Dependent Claim
112 words
A latch according to claim 1 wherein said rod is provided with an enlargement at said opposite end, said first and second keepers providing an opening when the second keeper is folded back toward said frame and approximately at right angle to said first keeper to allow the head end of said bar to pass into the slot in said first keeper, said head on said rod being substantially larger than the slot in said first and second keepers to keep said second keeper from being forced away from the end of said rod to disengage said rod from said second keeper when said door is in the secured partially open position.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |