Patent JPS63118162A successfully refreshed from Google Patents.
US3563586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floor bar lock: fail safe
Assignee: Individual
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Filing: 1969-07-28
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Granted: 1971-02-16
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Expires: 1989-07-28
Abstract
Abstract A vertical member is disposed in a floor mounted vertical hollow cylinder adjacent a door. Means are provided to move the member upwardly from the cylinder to block movement of the door or to move the member downwardly into the cylinder whereby the top of the member and the top of the cylinder are flush with the floor and the door can be opened and closed freely.
Inventors
- 👤 John M Creamer
- 👤 Jane Catherine Creamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:15
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/02; E05B47/026; E05B47/0001; E05B47/0002; E05C; E05C17/00; E05C17/02; E05C17/46; E05C17/48; E05B47/0003; E05B47/0004; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/096; Y10T292/1006; Y10T292/1007; Y10T292/1014; Y10T292/1021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
180 words
In combination with a door having a floor underneath, said floor having an opening adjacent the door: a hollow cylinder disposed vertically within the floor, said cylinder having one end with an opening aligned with the floor opening and also having a chamber; a member having a vertical shaft aligned with said aligned openings and being magnetically responsive, said member being disposed in said chamber, said member having a withdrawn position in the absence of a magnetic field at which said shaft does not extend out of the floor and the door can be opened or closed freely, said member having an extended position in the presence of a magnetic field at which said shaft extends out of the floor and prevents the door from being opened more than a few inches; first means in said chamber for producing a magnetic field when electrically energized; and second means having a first position at which the first means is energized and said member is extended and a second position at which the first means is deenergized and the member is withdrawn.
Claim 2
Dependent Claim
180 words
In combination with a door having a floor underneath, said floor having an opening adjacent the door: a hollow cylinder disposed vertically within the floor, said cylinder having one end with an opening aligned with the floor opening and also having a chamber; a member having a vertical shaft aligned with said aligned openings and being magnetically responsive, said member being disposed in said chamber, said member having a withdrawn position in the absence of a magnetic field at which said shaft does not extend out of the floor and the door can be opened or closed freely, said member having an extended position in the presence of a magnetic field at which said shaft extends out of the floor and prevents the door from being opened more than a few inches; first means in said chamber for producing a magnetic field when electrically energized; and second means having a first position at which the first means is energized and said member is extended and a second position at which the first means is deenergized and the member is withdrawn.
Claim 3
Dependent Claim
33 words
The combination as set forth in claim 1 wherein said member has a magnetic horizontal circular flat disc of diameter slightly smaller than that of the chamber at the bottom of the shaft.
Claim 4
Dependent Claim
60 words
The combination as set forth in claim 2 wherein said first means is an electromagnet in the shape of a toroid. 4. The combination as set forth in claim 3 wherein said toroid is disposed in the upper end of the chamber with its central bore aligned with both openings and of like diameter, said shaft extending through the bore.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |