Patent US4555988A successfully refreshed from Google Patents.
US4555988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for applying surface pressure to advancing workpieces
Assignee: Theodor Hymmen KG
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Filing: 1984-03-23
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Granted: 1985-12-03
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Expires: 2004-03-23
Abstract
Abstract In a device for applying surface pressure to advancing workpieces like boards of wooden material etc. with at least one continuous compression belt against the inside of which a compression plate acts, several pressure chambers are distributed along the width and/or the length of the effective pressure surface of the belt. Each pressure chamber consists on the one hand of a sealing strip and on the other hand of the facing surfaces of the compression plate and of the compression belt. The sealing strips are resiliently secured against and can be released from the compression plate by a strip-like diaphragm that demarcates a pressure space.
Inventors
- 👤 Werner Pankoke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:51
CPC Classifications
B; B30; B30B; B30B5/00; B30B5/04; B30B5/06; B30B5/062; Y; Y10; Y10S; Y10S277/00; Y10S277/906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
207 words
In a device for applying surface pressure to workpieces advancing on at least one movable compression belt having means for forcing the belt against the workpiece including means forming a first pressure chamber adjacent to the belt and receptive of a pressure medium including a compression plate and a continuous sealing strip between the compression plate and belt for sealing off the first pressure chamber, the improvement comprising means mounting the sealing strip to the compression plate comprising an elongated diaphragm disposed around the edge of the first pressure chamber, means attaching the sealing strip to a surface of the diaphragm facing the belt, means forming a second pressure chamber between the compression plate and the diaphragm and receptive of a pressure medium and including means connecting the edges of the diaphragm to the compression plate for sealing off the second pressure chamber from the first pressure chamber to form an additional elastic seal, with the surface of the diaphragm facing away from the sealing strip being subjected to the pressure medium, whereby the compression force between the sealing strip and the belt can be increased by the pressure medium in the second pressure chamber to prevent the escape of pressure medium from the first pressure chamber.
Claim 2
Dependent Claim
207 words
In a device for applying surface pressure to workpieces advancing on at least one movable compression belt having means for forcing the belt against the workpiece including means forming a first pressure chamber adjacent to the belt and receptive of a pressure medium including a compression plate and a continuous sealing strip between the compression plate and belt for sealing off the first pressure chamber, the improvement comprising means mounting the sealing strip to the compression plate comprising an elongated diaphragm disposed around the edge of the first pressure chamber, means attaching the sealing strip to a surface of the diaphragm facing the belt, means forming a second pressure chamber between the compression plate and the diaphragm and receptive of a pressure medium and including means connecting the edges of the diaphragm to the compression plate for sealing off the second pressure chamber from the first pressure chamber to form an additional elastic seal, with the surface of the diaphragm facing away from the sealing strip being subjected to the pressure medium, whereby the compression force between the sealing strip and the belt can be increased by the pressure medium in the second pressure chamber to prevent the escape of pressure medium from the first pressure chamber.
Claim 3
Dependent Claim
56 words
The device as in claim 1, further comprising a surrounding groove positioned in the vicinity of the edge of the compression plate and means tensioning the edges of the diaphragm against the walls of the groove whereby pressure medium can be introduced into the space demarcated by the surfaces of the groove and by the diaphragm.
Claim 4
Dependent Claim
32 words
The device as in claim 1, further comprising a hose connected to the side of the elastic diaphragm that faces away from the sealing strip and which is fillable with pressure medium.
Claim 5
Dependent Claim
24 words
The device as in claim 3, further comprising a compressed-air line in the compression plate which communicates with the space inside the pressure-medium hose.
Claim 6
Dependent Claim
27 words
The device as in claim 3, further comprising a holder pointing toward the compression belt and fastened to the pressure-medium hose with the diaphragm in between them.
Claim 7
Dependent Claim
23 words
The device as in claim 1, wherein the means attaching the diaphragm to the compression plate comprises lateral retaining strips penetrated by screws.
Claim 8
Dependent Claim
21 words
The device as in claim 5, wherein the pressure-medium hose comprises a rigid strip that is releasably attachable to the holder.
Claim 9
Dependent Claim
24 words
The device as in claim 1, wherein said sealing strip is directly attached to the side of the diaphragm that faces the compression belt.
Claim 10
Dependent Claim
18 words
The device as in claim 8, wherein the diaphragm has a groove that partly accommodates the sealing strip.
Claim 11
Dependent Claim
37 words
The device as in claim 1, wherein the means mounting the sealing strip comprises a frame attached to side of the diaphragm that faces away from the compression belt and wherein the sealing strip penetrates the diaphragm.
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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |