US4247274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holding device for surface sheets or plates in a press
Assignee: Individual
•
Filing: 1979-01-30
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Granted: 1981-01-27
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Expires: 1999-01-30
Abstract
Abstract A holding device for surface sheets or surface plates in a press intended, for example for pressing wood fiber products, include a press plate, a vacuum source for supplying vacuum to the side of a surface sheet or surface plate which faces toward the press plate, a vacuum distributing body placed between the press plate and the surface sheet, and a seal which is arranged to provide sealing between the present plate and the surface sheet. A substantially air-impervious sheet is disposed between the press plate and the surface sheet to form two essentially closed spaces coupled in air communication with the vacuum. This arrangement permits independent removal of the surface sheets from the press plates.
Inventors
- 👤 Gunnar A. Gustafson
- 👤 Ture R. L. Holmqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:52
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B30; B30B; B30B15/00; B30B15/02; B30B15/026; B30B7/00; B30B7/02; Y; Y10; Y10S; Y10S425/00; Y10S425/06; Y10S425/119
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
226 words
Holding device for surface sheets or surface plates in a press, comprising: a press plate (13); a surface sheet or plate (25) mounted to said press plate (13) with a surface facing toward said press plate (13); means (28, 28a) for supplying vacuum to said surface of said surface sheet or plate (25) which faces towards said press plate (13); an air-pervious vacuum-distributing body (27) mounted between said press plate (13) and said surface sheet or plate (25) and in air communication with said vacuum supplying means (28); a seal (26) for providing air-tight sealing between said press plate (13) and said surface of said surface sheet or plate (25) which faces toward said press plate (13); and a substantially air-impervious sheet (29) disposed between said press plate (13) and said surface sheet or plate (25) and in air sealing communication with said seal (26) to form two essentially closed spaces coupled in air communication with said vacuum supplying means (28, 28a) to either (i) hold both said surface sheet or plate (25) and said seal (26) and said substantially air-impervious sheet (29) and thus said vacuum distributing body (27) in position in relation to said press plate (13), or (ii) hold only said substantially air-impervious sheet (29) and said seal (26) and thus said vacuum distributing body (27) in relation to said press plate (13).
Claim 2
Dependent Claim
226 words
Holding device for surface sheets or surface plates in a press, comprising: a press plate (13); a surface sheet or plate (25) mounted to said press plate (13) with a surface facing toward said press plate (13); means (28, 28a) for supplying vacuum to said surface of said surface sheet or plate (25) which faces towards said press plate (13); an air-pervious vacuum-distributing body (27) mounted between said press plate (13) and said surface sheet or plate (25) and in air communication with said vacuum supplying means (28); a seal (26) for providing air-tight sealing between said press plate (13) and said surface of said surface sheet or plate (25) which faces toward said press plate (13); and a substantially air-impervious sheet (29) disposed between said press plate (13) and said surface sheet or plate (25) and in air sealing communication with said seal (26) to form two essentially closed spaces coupled in air communication with said vacuum supplying means (28, 28a) to either (i) hold both said surface sheet or plate (25) and said seal (26) and said substantially air-impervious sheet (29) and thus said vacuum distributing body (27) in position in relation to said press plate (13), or (ii) hold only said substantially air-impervious sheet (29) and said seal (26) and thus said vacuum distributing body (27) in relation to said press plate (13).
Claim 3
Dependent Claim
40 words
The holding device of claim 1, wherein said seal comprises a first slotted portion for sealingly receiving said substantially air-impervious sheet (29), and seal portions which respectively seal against said surface sheet or plate (25) and said press plate (13).
Claim 4
Dependent Claim
15 words
The holding device of claim 1, wherein said substantially air-impervious sheet (29) comprises a plate.
Claim 5
Dependent Claim
46 words
The holding device of either of claims 1 or 3, wherein said air-impervious sheet (29) is provided with a number of valves (30) therein, said valves (30) being openable by said surface sheet or plate (25) to provide air communication between said two essentially closed spaces.
Claim 6
Dependent Claim
25 words
The holding device of claim 4, wherein said valves (30) include means for contacting said surface sheet or plate (29) to open said valves (30).
Claim 7
Dependent Claim
37 words
The holding device of claim 4, wherein said vacuum supplying means comprises a first vacuum line (28) running through said press plate (13) for supplying vacuum to at least one side of said substantially air-impervious sheet (29).
Claim 8
Dependent Claim
36 words
The holding device of claim 4, wherein said vacuum supplying means further comprises a second line (28a) for supplying vacuum to the side of said air-impervious sheet (29) which faces said surface sheet or plate (25).
Claim 9
Dependent Claim
31 words
The holding device of claim 7, wherein said second line (28a) runs in said surface sheet or plate (25) and opens on the surface thereof facing said substantially air-impervious sheet (29).
Claim 10
Dependent Claim
64 words
The holding device of any one of claim 1 or 3 wherein said substantially air-impervious sheet (29) includes means for applying a sufficiently large vacuum to said surface sheet or plate (25) to hold same in position by said vacuum applied thereto, and means for interrupting said last-mentioned vacuum application when said surface sheet or plate (25) is removed from said press plate (13).
Claim 11
Dependent Claim
78 words
The holding device of any one of claims 1 or 3 wherein said substantially air-impervious sheet (29) comprises a plurality of relatively small openings therein for transferring vacuum to the space between said substantially air-impervious sheet (29) and said surface sheet or plate (25), said holes being sufficiently small, and said supplied vacuum being sufficiently large, that said vacuum retains said substantially air-impervious sheet (29) and said seal (26) in position despite the leakage through said small openings.
Claim 12
Dependent Claim
14 words
The holding device of claim 1, wherein said seal comprises a lipped seal (26).
Claim 13
Dependent Claim
41 words
The holding device of claim 11, wherein said seal comprises a lip (26a) which seals against said surface sheet or plate (25) and a further sealing portion which seals against said substantially air-impervious sheet (29) and against said press plate (13).
Claim 14
Dependent Claim
37 words
The holding device of claim 1, wherein said vacuum supplying means comprises a first vacuum line (28) running through said press plate (13) for supplying vacuum to at least one side of said substantially air-impervious sheet (29).
Claim 15
Dependent Claim
36 words
The holding device of claim 13, wherein said vacuum supplying means further comprises a second line (28a) for supplying vacuum to the side of said air-impervious sheet (29) which faces said surface sheet or plate (25).
Claim 16
Dependent Claim
31 words
The holding device of claim 14, wherein said second line (28a) runs in said surface sheet or plate (25) and opens on the surface thereof facing said substantially air-impervious sheet (29).
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |