US4254561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying cylinder for a paper-making machine
Assignee: JM Voith GmbH
•
Filing: 1979-11-29
•
Granted: 1981-03-10
•
Expires: 1999-11-29
Abstract
Abstract A drying cylinder for a paper-making machine comprises a cylinder barrel with end covers mounted on a hollow shaft. Steam for heating the cylinder can be introduced through an inlet at an end of the shaft. The steam passes through openings along the hollow shaft to heat the barrel. In order to reduce the risk of pollutants or condensate entering the annular space between the cylinder barrel and the hollow shaft, the openings in the hollow shaft are provided with tubular components which project into the interior of the hollow shaft. Either the tubular components themselves are shaped or a baffle plate is provided for blocking entrance of pollutants into the tubular components. A suction device removes condensate from the inside of the inner shaft.
Inventors
- 👤 Christian Schiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:31
CPC Classifications
D; D21; D21F; D21F5/00; D21F5/02; D21F5/022; D21F5/028; D21F5/021; F; F28; F28D; F28D11/00; F28D11/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A drying cylinder for use in a paper-making machine, comprising a cylinder barrel which is mounted on and which surrounds a hollow shaft; said cylinder barrel having an inner wall; said shaft having an inlet for steam; said shaft having outlet openings for passage of steam toward said inner wall of said cylinder barrel; said openings in said hollow shaft being provided with and defined by tubular components each of which has a free end projecting into the interior of said hollow shaft.
Claim 2
Dependent Claim
83 words
A drying cylinder for use in a paper-making machine, comprising a cylinder barrel which is mounted on and which surrounds a hollow shaft; said cylinder barrel having an inner wall; said shaft having an inlet for steam; said shaft having outlet openings for passage of steam toward said inner wall of said cylinder barrel; said openings in said hollow shaft being provided with and defined by tubular components each of which has a free end projecting into the interior of said hollow shaft.
Claim 3
Dependent Claim
29 words
A drying cylinder according to claim 1, further comprising two end covers over the ends of said cylinder barrel, and said end covers being mounted on said hollow shaft.
Claim 4
Dependent Claim
47 words
A drying cylinder according to claim 1, wherein said hollow shaft has an inner surface; and further comprising at least one suction device, which terminates close to said inner surface of said hollow shaft, for drawing off materials collecting on said inner surface of said hollow shaft.
Claim 5
Dependent Claim
30 words
A drying cylinder according to claim 3, in which said inner surface of said hollow shaft is provided with a respective trough-like depression into which each said suction device projects.
Claim 6
Dependent Claim
48 words
A drying cylinder according to either of claims 3 or 4, in which said hollow shaft has an axially central section of larger inner diameter which tapers conically to a smaller diameter at each end of said hollow shaft; said suction devices being disposed in said central section.
Claim 7
Dependent Claim
25 words
A drying cylinder according to either of claims 1 or 3, further comprising means for removing condensate from said inner wall of said cylinder barrel.
Claim 8
Dependent Claim
38 words
A drying cylinder according to claim 3, further comprising means for removing condensate from said inner wall of said cylinder barrel and further comprising a common condensate discharge line for said suction device and said condensate removing means.
Claim 9
Dependent Claim
30 words
A drying cylinder according to claim 7, in which said inner surface of said hollow shaft is provided with a respective trough-like depression into which each said suction device projects.
Claim 10
Dependent Claim
19 words
A drying cylinder according to claim 1, wherein said inlet for steam is at one end of said shaft.
Claim 11
Dependent Claim
43 words
A drying cylinder according to claim 9, in which each said free end terminates obliquely, and each said tubular component being oriented so that the longer part of the oblique free end of each said tubular component faces towards said steam inlet side.
Claim 12
Dependent Claim
27 words
A drying cylinder according to claim 9, further comprising a baffle plate arranged between said steam inlet and the first said tubular component nearest said steam inlet.
Claim 13
Dependent Claim
24 words
A drying cylinder according to claim 9, further comprising means for blocking pollutants that enter through said steam inlet from entering said tubular components.
References Cited (Backward Citations)
US2563692A
Cited
US3177932A
Cited
US3299531A
Cited
US3363328A
Cited
US3633662A
Cited
US3967386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |