US3913240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sieve roll for use in paper drying apparatus or the like
Assignee: JM Voith GmbH
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Filing: 1974-11-22
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Granted: 1975-10-21
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Expires: 1994-11-22
Abstract
Abstract A sieve roll for use in paper drying apparatus wherein the tube of a shaft assembly carries two reinforced end walls whose innermost portions are welded to the tube and whose outermost portions are welded to the respective ends of elongated strips. The strips are disposed in planes which include the axis of the shaft assembly and they form a cylindrical sidewall spacedly surrounding the shaft assembly between the end walls. The space between the end walls receives rings which surround the shaft assembly, and have peripheral recesses for the strips. Each second ring is welded to the shaft assembly and to the strips, and the remaining rings are welded only to the strips. The cross section of each end wall is a right-angled triangle.
Inventors
- 👤 Hans Flamig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:41
CPC Classifications
D; D21; D21F; D21F5/00; D21F5/14; D21F5/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
A rotary sieve roll, particularly for use in apparatus for drying paper webs, comprising a shaft assembly; a pair of axially spaced end walls coaxial and rigid with said shaft assembly; a plurality spaced rings surrounding said shaft assembly intermediate said end walls, said rings having outer edge portions; and a hollow cylindrical side wall including a plurality of circumferentially spaced elongated strips having end portions rigid with said end walls and extending in parallelism with the axis of said shaft assembly and intermediate portions connected with said outer edge portions of said rings, said strips defining openings with said rings and each strip being located in a plane including the axis of said shaft assembly, each of said end walls having a substantially triangular crosssectional outline as considered in a plane including the axis of said shaft assembly, each of said outlines having an outer corner portion adjacent to the respective end portions of said strips and two additional corner portions adjacent to said shaft assembly.
Claim 2
Dependent Claim
167 words
A rotary sieve roll, particularly for use in apparatus for drying paper webs, comprising a shaft assembly; a pair of axially spaced end walls coaxial and rigid with said shaft assembly; a plurality spaced rings surrounding said shaft assembly intermediate said end walls, said rings having outer edge portions; and a hollow cylindrical side wall including a plurality of circumferentially spaced elongated strips having end portions rigid with said end walls and extending in parallelism with the axis of said shaft assembly and intermediate portions connected with said outer edge portions of said rings, said strips defining openings with said rings and each strip being located in a plane including the axis of said shaft assembly, each of said end walls having a substantially triangular crosssectional outline as considered in a plane including the axis of said shaft assembly, each of said outlines having an outer corner portion adjacent to the respective end portions of said strips and two additional corner portions adjacent to said shaft assembly.
Claim 3
Dependent Claim
21 words
A sieve roll as defined in claim 1, wherein at least some of said rings are rigid with said shaft assembly.
Claim 4
Dependent Claim
20 words
A sieve roll as defined in claim 1, wherein said outer edge portions are provided with recesses for said strips.
Claim 5
Dependent Claim
22 words
A sieve roll as defined in claim 1, wherein said end walls comprise stiffening elements extending substantially radially of said shaft assembly.
Claim 6
Dependent Claim
58 words
A sieve roll as defined in claim 1, wherein said shaft assembly comprises a tubular member which is coaxial with and is spacedly surrounded by said sidewall and a second member including trunnions coaxial with, received in and having portions extending beyond the ends of said tubular member, said end walls being rigid with one of said members.
Claim 7
Dependent Claim
49 words
A sieve roll as defined in claim 1, wherein said rings include a first group of rings which are rigid with said strips and with said shaft assembly and a second group of rings which are rigid with said strips and alternate with the rings of said first group.
Claim 8
Dependent Claim
30 words
A sieve roll as defined in claim 1, wherein said shaft assembly, said strips, said end walls and said rings consist at least in part of a corrosion-resistant metallic material.
Claim 9
Dependent Claim
27 words
A sieve roll as defined in claim 1, wherein said strips are welded to said end walls and said end walls are welded to said shaft assembly.
Claim 10
Dependent Claim
23 words
A sieve roll as defined in claim 1, wherein each of said end walls was a cross-sectional outline which is a right-angled triangle.
Claim 11
Dependent Claim
26 words
A sieve roll as defined in claim 1, wherein the diameter of said shaft assembly is a small fraction of the outer diameter of said sidewall.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |