Patent US3839147A successfully refreshed from Google Patents.
US3839147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous web press nip structure including nonporous belts backed by fluid pressure chambers having flexible sills
Assignee: Beloit Corp
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Filing: 1973-03-22
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Granted: 1974-10-01
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Expires: 1993-03-22
Abstract
Abstract An improved extended nip press for dewatering a traveling fibrous paper web with opposed looped belts defining a press nip therebetween and shoes within each of the belts providing a backing for a pressure chamber exposed to the belts opposite the nip. Sills made of a flexible material are connected to the shoes to form the pressure chambers and have surfaces for sliding engagement with the moving belts. Tipping of the sills is prevented by use of reinforcing ribs and/or by use of a perforated diaphragm attached to all four sides of the sills which apply a lateral inwardly directed force relative to the belt surfaces. The sills may be provided with conical recesses from the inside the outside surfaces to enhance their flexibility and the sills may contain passages for high pressure fluid to pass therethrough to the sill surfaces.
Inventors
- 👤 R Daane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:37
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/0209; D21F3/0218; D21F3/0227
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
156 words
An extended press for pressing moisture from a fIbrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween, at least one of said surfaces including; a looped flexible traveling belt; a shoe within said belt; a sill on the shoe, said shoe and sill defining a fluid pressure chamber facing the belt opposite the nip exposed to the inner surface of the belt with the sill at the edges of the chamber between the shoe and belt for preventing the free escape of fluid from the chamber with the sill having a surface being in surface sliding engagement with the belt; said sill constructed of a flexible material; means for pressurizing said chamber with fluid; and means for applying a force directed laterally inwardly relative to the belt surface against said sill substantially at the sill surface preventing the sill from being forced outwardly by the fluid pressure in said chamber.
Claim 2
Dependent Claim
156 words
An extended press for pressing moisture from a fIbrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween, at least one of said surfaces including; a looped flexible traveling belt; a shoe within said belt; a sill on the shoe, said shoe and sill defining a fluid pressure chamber facing the belt opposite the nip exposed to the inner surface of the belt with the sill at the edges of the chamber between the shoe and belt for preventing the free escape of fluid from the chamber with the sill having a surface being in surface sliding engagement with the belt; said sill constructed of a flexible material; means for pressurizing said chamber with fluid; and means for applying a force directed laterally inwardly relative to the belt surface against said sill substantially at the sill surface preventing the sill from being forced outwardly by the fluid pressure in said chamber.
Claim 3
Dependent Claim
47 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 1: wherein said force applying means consists of an attachment means extending from the sill at one side of the chamber to the sill at the other side of the chamber.
Claim 4
Dependent Claim
38 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 2: wherein said attachment means is in diaphragm form having a continuous attachment to the sills at the sides of the chamber.
Claim 5
Dependent Claim
42 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 3: including means defining openings through the diaphragm for the free passage of fluid from the chamber to the space between the sheet and the belt.
Claim 6
Dependent Claim
39 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 3: wherein said diaphragm is formed of a yieldable flexible material and includes strengthening ribs extending therethrough having a relatively high tensile strength.
Claim 7
Dependent Claim
43 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 3: wherein said sill is continuous and encircles the chamber extending over four sides thereof to provide a leading and trailing sill portion and side sill portions.
Claim 8
Dependent Claim
94 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 3: including a second looped traveling belt at the other side of the nip; and a shoe within said second belt opposite the nip; sills, said shoe and sills forming a second fluid pressure chamber exposed to the inner surface of the belt; and a diaphragm joining the sills of the second chamber; each of said sills being continuous and extending completely around the sides of the chambers providing leading and trailing sill portions and side sill portions.
Claim 9
Dependent Claim
112 words
An extended press for pressing moisture from a fibrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including: a looped flexible traveling belt; a shoe positioned within the belt opposite the nip; a sill, said shoe and sill forming a fluid pressure chamber with the chamber exposed to the inner surface of the belt; said sill having a sill surface slidably engaging the belt and preventing the free escape of fluid from the chamber with said sill constructed of a flexible material; and means defining recesses into the sill extending in a lateral direction relative to the belt surface.
Claim 10
Dependent Claim
112 words
An extended press for pressing moisture from a fibrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including: a looped flexible traveling belt; a shoe positioned within the belt opposite the nip; a sill, said shoe and sill forming a fluid pressure chamber with the chamber exposed to the inner surface of the belt; said sill having a sill surface slidably engaging the belt and preventing the free escape of fluid from the chamber with said sill constructed of a flexible material; and means defining recesses into the sill extending in a lateral direction relative to the belt surface.
Claim 11
Dependent Claim
42 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 8: wherein said recesses extend from the inner edge of said sill in an outward direction therefore admitting fluid from within the chamber being pressurized thereby.
Claim 12
Dependent Claim
41 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 8: wherein lateral recesses extend inwardly from the outside of said sill and from the inside of said sill staggered with respect to each other.
Claim 13
Dependent Claim
46 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 10: wherein said recesses are conically shaped and are of a length so that the deepest portion of the inner recesses extend beyond the deepest portion of the outer recesses.
Claim 14
Dependent Claim
105 words
An extended press for pressing moisture from a fibrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including; a looped flexible traveling belt; a shoe positioned within the belt; flexible sill walls attached to the shoe and defining a fluid pressure chamber within the belt opposite the nip exposed to the inner surface of the belt; said walls having sills with sill surfaces in sliding engagement with the belt; and means applying a lateral force to the sills substantially at said sill surfaces preventing them from moving outwardly away from the chamber.
Claim 15
Dependent Claim
105 words
An extended press for pressing moisture from a fibrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including; a looped flexible traveling belt; a shoe positioned within the belt; flexible sill walls attached to the shoe and defining a fluid pressure chamber within the belt opposite the nip exposed to the inner surface of the belt; said walls having sills with sill surfaces in sliding engagement with the belt; and means applying a lateral force to the sills substantially at said sill surfaces preventing them from moving outwardly away from the chamber.
Claim 16
Dependent Claim
29 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 12: wherein said sill surfaces have substantially greater lateral dimensions than the walls.
Claim 17
Dependent Claim
41 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 13: including reinforcing means embedded in said sills preventing them from being outwardly away from the chamber in a direction parallel to the belt surface.
Claim 18
Dependent Claim
110 words
An extended press for pressing moisture from a fibrous web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including: a looped flexible traveling belt; a shoe within the belt; sills at the edges of the chamber having sill surfaces in sliding engagement with the belt; said shoe and sills form a liquid pressure chamber with the chamber exposed to the inner surface of the belt opposite the nip; and fluid passages opening through said sill surfaces intermediate the eges of the surfaces for directing fluid under pressure through the openings with said fluid flowing against the traveling belt surface.
Claim 19
Dependent Claim
110 words
An extended press for pressing moisture from a fibrous web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including: a looped flexible traveling belt; a shoe within the belt; sills at the edges of the chamber having sill surfaces in sliding engagement with the belt; said shoe and sills form a liquid pressure chamber with the chamber exposed to the inner surface of the belt opposite the nip; and fluid passages opening through said sill surfaces intermediate the eges of the surfaces for directing fluid under pressure through the openings with said fluid flowing against the traveling belt surface.
Claim 20
Dependent Claim
36 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 15: including means for directing fluid through said sill openings at a pressure higher than the pressure in said chamber.
Claim 21
Dependent Claim
53 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 16: wherein the size of said passages is such that the fluid pressure drop therethrough results in a pressure at the sill openings substantially equal to the normal pressure in the sealing gap at normal gap width.
Claim 22
Dependent Claim
33 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 15: including a high pressure conduit within said chamber connected to the fluid passages through said sill.
Claim 23
Dependent Claim
116 words
An extended press for pressing moisture from a fibrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including: a looped flexible traveling belt; a shoe within the belt opposite the nip; a sill at the sides of the chamber having a sill surface in sliding engagement with the belt and being formed of a flexible yieldable material; said shoe and sill forming a fluid pressure chamber exposed to the inner surface of the belt; and lateral stiffening means embedded in said sills for said sills preventing the sills from being forced outwardly on the edge of the belt from pressure within the chamber.
Claim 24
Dependent Claim
116 words
An extended press for pressing moisture from a fibrous paper web comprising in combination: opposed traveling surfaces defining an extended press nip therebetween with at least one of said surfaces including: a looped flexible traveling belt; a shoe within the belt opposite the nip; a sill at the sides of the chamber having a sill surface in sliding engagement with the belt and being formed of a flexible yieldable material; said shoe and sill forming a fluid pressure chamber exposed to the inner surface of the belt; and lateral stiffening means embedded in said sills for said sills preventing the sills from being forced outwardly on the edge of the belt from pressure within the chamber.
Claim 25
Dependent Claim
45 words
An extended press for pressing moisture from a fibrous paper web constructed in accordance with claim 19: wherein said lateral stiffening means includes ribs embedded in the sills having a strength greater than the material of the sills and extending laterally outwArdly of the chamber.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |