US4055879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller
Assignee: Agfa Gevaert AG
•
Filing: 1976-05-25
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Granted: 1977-11-01
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Expires: 1996-05-25
Abstract
Abstract A roller to be used in apparatus for wet treatment of photographic material comprises a hollow metallic core and two inserts with coupling shafts provided therein. A coat of chemically resistant thermoplastic material is applied around and sealingly surrounds the core to protect it from the corrosive action of media used in the wet treatment process. The outer surface of the thus coated roller is thereupon machined to a high-quality finish.
Inventors
- 👤 Siegfried Schneider
- 👤 Kurt Thate
- 👤 Erwin Geyken
- 👤 Horst Kempe
- 👤 Stephan Macher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:55
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0032; B29D99/0035; F; F16; F16C; F16C13/00; G; G03; G03D; G03D3/00; G03D3/08; G03D3/13; B29L; B29L2031/00; B29L2031/32; B29L2031/324
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A roller, particularly for use in apparatus for wet treatment of strip or sheet material with aggressive fluids, comprising an elongated metallic core having two spaced end portions and an outer surface; a cylindrical coat of chemically resistant thermoplastic material immediately adjacent to said outer surface and having end openings adjacent said end portions of said core; and two side elements of synthetic plastic material fully overlapping said end openings of said coat and having portions received in said end portions of said core, said side elements having coupling means coaxial with said core and being sealingly bonded with said coat so that said side elements and said coat together form a closed fluid tight and corrosion-resistant envelope of synthetic plastic material around said metallic core to protect the same from attack by said aggressive fluids.
Claim 2
Dependent Claim
136 words
A roller, particularly for use in apparatus for wet treatment of strip or sheet material with aggressive fluids, comprising an elongated metallic core having two spaced end portions and an outer surface; a cylindrical coat of chemically resistant thermoplastic material immediately adjacent to said outer surface and having end openings adjacent said end portions of said core; and two side elements of synthetic plastic material fully overlapping said end openings of said coat and having portions received in said end portions of said core, said side elements having coupling means coaxial with said core and being sealingly bonded with said coat so that said side elements and said coat together form a closed fluid tight and corrosion-resistant envelope of synthetic plastic material around said metallic core to protect the same from attack by said aggressive fluids.
Claim 3
Dependent Claim
33 words
A roller as defined in claim 1, wherein each of said synthetic plastic side elements has a transversely complete cross-section at least equal to the respective inner dimension of the respective end opening.
Claim 4
Dependent Claim
58 words
A roller as defined in claim 1, particularly for use in apparatus for multistage wet treatment using a plurality of different aggressive fluids, wherein said cylindrical coat is of a material selected from the group consisting of hard polyvinyl chloride, crystalline polyamide, polypropelene, polyethelene and their combinations so as to be resistant against said plurality of said fluids.
Claim 5
Dependent Claim
68 words
A roller as defined in claim 1, wherein said coat has open ends adjacent said end portions of said core and forming respective edge portions, and said side elements have flanges adjacent said end portions of said core and extending axially outwardly of said core in a direction substantially transverse to the latter, said edge portions of said coat being bonded with said flanges of said side elements.
Claim 6
Dependent Claim
50 words
A roller as defined in claim 1, wherein said side elements are provided with axial bores; and said coupling means are shafts having portions thereof provided with radially extending projections, said portions of said shafts being received in said bores of said side elements and fixedly connected to the latter.
Claim 7
Dependent Claim
35 words
A roller as defined in claim 1, wherein each of said coupling means is a shaft; and each of said side elements is provided with radially extending ribs, said shaft being inserted between said ribs.
Claim 8
Dependent Claim
20 words
A roller as defined in claim 6, wherein said ribs form voids therebetween, said voids being filled with thermoplastic material.
Claim 9
Dependent Claim
29 words
A roller as defined in claim 1, wherein said end portions of said core are provided with counterbores, said portions of said side elements being received in said counterbores.
References Cited (Backward Citations)
GB323089A
Cited
GB364865A
Cited
GB468482A
Cited
GB540535A
Cited
US2356007A
Cited
FR1280873A
Cited
US3139826A
Cited
US3611028A
Cited
US3971115A
Cited
US3912901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |