Patent US4228873A successfully refreshed from Google Patents.
US4228873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator door safety mechanism
Assignee: Tri County Elevator Co Inc
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Filing: 1978-11-02
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Granted: 1980-10-21
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Expires: 1998-11-02
Abstract
Abstract An elevator shaft door safety mechanism which permits the shaft door to be opened by authorized persons when the elevator is not in place. The mechanism is particularly suitable for use with doors of the hingedly mounted type. The mechanism is lock controlled and permits manual operation of the latching mechanism with the use of a special tool.
Inventors
- 👤 George L. Nyborg, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:06
CPC Classifications
B; B66; B66B; B66B13/00; B66B13/02; B66B13/14; B66B13/16; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5204; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7661; Y10T70/7915; Y10T70/7955; Y10T70/7977; Y10T70/7983; Y10T70/80; Y10T70/8946
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
186 words
A safety mechanism for an elevator shaft door which is hingedly mounted to a door frame, comprising in combination: latching means to latch said door to said door frame, said latching means including bolt means, keeper means mounted on said door for engagement with said bolt means of said latching means, said latching means including first and second latch releasing means to free said keeper means from said engagement to said bolt means to permit said door to open, said first latch releasing means being operated by the presence of an elevator proximate to said door, said second latch releasing means including a rod mounted therein, said rod being in engagement with said bolt means, said rod being manually operable to release said engagement of said keeper means by said bolt means, an aperture in at least one of said door and said door frame to permit access to said second latch releasing means; and lock means releaseably engageable with said aperture to seal said aperture when said lock means are in place and to permit access to said aperture when said lock means are removed.
Claim 2
Dependent Claim
186 words
A safety mechanism for an elevator shaft door which is hingedly mounted to a door frame, comprising in combination: latching means to latch said door to said door frame, said latching means including bolt means, keeper means mounted on said door for engagement with said bolt means of said latching means, said latching means including first and second latch releasing means to free said keeper means from said engagement to said bolt means to permit said door to open, said first latch releasing means being operated by the presence of an elevator proximate to said door, said second latch releasing means including a rod mounted therein, said rod being in engagement with said bolt means, said rod being manually operable to release said engagement of said keeper means by said bolt means, an aperture in at least one of said door and said door frame to permit access to said second latch releasing means; and lock means releaseably engageable with said aperture to seal said aperture when said lock means are in place and to permit access to said aperture when said lock means are removed.
Claim 3
Dependent Claim
19 words
The mechanism as claimed in claim 1, wherein said aperture and said lock means are disposed on said door.
Claim 4
Dependent Claim
19 words
The mechanism as claimed in claim 1, wherein said aperture and lock means are disposed on said door frame.
Claim 5
Dependent Claim
39 words
The mechanism as claimed in claim 1, wherein said lock means include a plug receiver, a removeable plug releaseably engageable with said plug receiver and key means insertable into said plug to release said plug from said plug receiver.
Claim 6
Dependent Claim
39 words
The mechanism as claimed in claim 4, wherein said plug includes at least one lock bolt, said lock bolt extending laterally from said plug to engage said plug receiver when said key means are not inserted in said plug.
Claim 7
Dependent Claim
56 words
The mechanism as claimed in claim 4, wherein at least one of said plug and said plug receiver includes a tab, and the other of said plug and said plug receiver includes a groove, said tab being insertable within said groove to prevent said plug and said plug receiver from rotating with respect to each other.
Claim 8
Dependent Claim
34 words
The mechanism as claimed in claim 1, wherein said first latch releasing means comprise means for engagement with the door of an elevator car, when said car is in proximity to said shaft door.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |