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US4194549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Upwardly openable door
Assignee: Alfred Lovgren Byggnads AB
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Filing: 1978-05-01
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Granted: 1980-03-25
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Expires: 1998-05-01
Abstract
Abstract A collapsible door apparatus for industrial buildings and other installations where a high degree of utilization of the space inside of the door and large door openings are required, for example, for chamber driers. The door is characterized by a door member suspended at a section which is adapted to be attached to the upper limit surface of the door opening and comprises means for raising and lowering the door member by means of at least one wire rope attached to the lower part of the door member. The door member comprises at least one sheet of flexible material and a plurality of stiff cross-members spaced relative to each other and connected with the sheet of flexible material. The cross-members extend transversely of the door member and are guided at their ends in vertical guide bars attached to the vertical limit surfaces of the door openings. The wire rope extends through the cross-members and to the lowermost cross-member where it is attached thereto.
Inventors
- 👤 Anders Lovgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:52
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/262; E06B3/00; E06B3/01; E06B9/02; E06B9/08; E06B9/11; E06B9/13; E06B2009/135; E06B2009/2423; E06B2009/2447; E06B2009/2458; E06B2009/2627
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
180 words
A collapsible door apparatus comprising: a door member having a plurality of generally horizontal rigid spaced members, and at least one sheet of flexible material fastened to said spaced members; a door frame including vertically disposed channel means for guiding the ends of said spaced members; said channel means comprising first and second parallel spaced members arranged parallel to the plane of the door and a third member which is perpendicular to said first and second members; first and second roller means at each end of said rigid members, one of said rollers being located between said first and second members and the other coacting with said third member; and door operating means for selectively moving upwardly the bottom-most of said spaced members to thereby in turn move all said spaced members as said bottom-most member upon being raised abuts the next said member and so on until all said members have been raised to open the door; said flexible material between each successive pair of said spaced members forming a loop of said material as the door is raised.
Claim 2
Dependent Claim
180 words
A collapsible door apparatus comprising: a door member having a plurality of generally horizontal rigid spaced members, and at least one sheet of flexible material fastened to said spaced members; a door frame including vertically disposed channel means for guiding the ends of said spaced members; said channel means comprising first and second parallel spaced members arranged parallel to the plane of the door and a third member which is perpendicular to said first and second members; first and second roller means at each end of said rigid members, one of said rollers being located between said first and second members and the other coacting with said third member; and door operating means for selectively moving upwardly the bottom-most of said spaced members to thereby in turn move all said spaced members as said bottom-most member upon being raised abuts the next said member and so on until all said members have been raised to open the door; said flexible material between each successive pair of said spaced members forming a loop of said material as the door is raised.
Claim 3
Dependent Claim
30 words
A door as defined in claim 1, characterized in that each channel means comprises two angle irons, of which one is movable in relation to its distance from the other.
Claim 4
Dependent Claim
48 words
A door as defined in claim 1, characterized in that for sealing between the door member and the door frame sealing strips are provided at the door frame at least one the inside of the door which strips extend inwardly over the door member along its entire height.
Claim 5
Dependent Claim
29 words
A door as defined in claim 1, characterized in that said at least one sheet of flexible material is secured on the cross-members by means of strips connected therewith.
References Cited (Backward Citations)
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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) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |