Patent US3924884A successfully refreshed from Google Patents.
US3924884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latches
Assignee: WILFRID OVERTON Ltd
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Filing: 1974-04-08
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Granted: 1975-12-09
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Expires: 1994-04-08
Abstract
Abstract In a door latch with a pivoted latch member controlled by a toggle linkage which is urged into the over-center condition in the open and closed positions of the door, a projection on one of the links of the toggle linkage is placed to engage the striker as the door is closed, thereby urging the toggle linkage through center and allowing the latch member to be retracted by the striker, so that the latch can be slammed.
Inventors
- 👤 John James Watson Christie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:23
CPC Classifications
E; E05; E05C; E05C3/00; E05C3/12; E05C3/16; E05C3/124; Y; Y10; Y10S; Y10S292/00; Y10S292/49; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1075; Y10T292/1076; Y10T292/1078
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
A slam latch for connecting a door member to a door frame member, said latch comprising a latching member pivoted about an axis and designed to be mounted on the one member (e.g. a door) and to engage a striker on the other member (e.g. a door frame), said latching member being controlled by a toggle linkage comprising first and second links pivoted together, said second link being pivoted to a point fixed in relation to said axis and said first link being pivoted to said laTching member, said toggle linkage being designed to pass to an over-center position in the latched condition of the latch, and said first link including an extension beyond its pivotal connection with said latching member, said extension being placed in the path of the striker relative to said latching member whereby when the door member is slammed, said extension is engaged by the striker and displaces said toggle linkage out of its over-center condition.
Claim 2
Dependent Claim
160 words
A slam latch for connecting a door member to a door frame member, said latch comprising a latching member pivoted about an axis and designed to be mounted on the one member (e.g. a door) and to engage a striker on the other member (e.g. a door frame), said latching member being controlled by a toggle linkage comprising first and second links pivoted together, said second link being pivoted to a point fixed in relation to said axis and said first link being pivoted to said laTching member, said toggle linkage being designed to pass to an over-center position in the latched condition of the latch, and said first link including an extension beyond its pivotal connection with said latching member, said extension being placed in the path of the striker relative to said latching member whereby when the door member is slammed, said extension is engaged by the striker and displaces said toggle linkage out of its over-center condition.
Claim 3
Dependent Claim
27 words
The latch set forth in claim 1 wherein said latching member has an arcuate surface that engages said striker and said surface in concentric with said axis.
Claim 4
Dependent Claim
29 words
The latch set forth in claim 1 wherein said latching member has an arcuate surface that engages said striker and said surface is eccentric with respect to said axis.
References Cited (Backward Citations)
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US2865313A
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |