US4088531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewatering device for the wire section of a paper or board machine
Assignee: Tampella Oy AB
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Filing: 1977-02-14
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Granted: 1978-05-09
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Expires: 1997-02-14
Abstract
Abstract A dewatering device for the wire section of a paper or board machine, comprising a dewatering blade and a supporting rail, the blade extending transversely under said wire in striking contact therewith. The support rail is provided with a guide way forming combined T- and fishtail grooves for supporting in firm engagement selectively a blade provided with a T-guide way or a blade provided with a fishtail guide way.
Inventors
- 👤 Veikko Lamminen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:46
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/48; D21F1/483
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
115 words
A dewatering device for the wire section of a paper or board machine, said device comprising a dewatering blade located below said wire and transversely of the direction of movement thereof and a rail supporting the blade, said blade and rail being slidably connected to each other by a joint incorporating two guide ways formed respectively in said blade and said rail and extending transversely of the wire, the guide way of the blade comprising two projections and the guide way of the rail comprising two grooves, at least one of said grooves being a combined T-and fishtail groove having a T-groove surface and a fishtail groove surface, said surfaces forming an obtuse included angle.
Claim 2
Dependent Claim
115 words
A dewatering device for the wire section of a paper or board machine, said device comprising a dewatering blade located below said wire and transversely of the direction of movement thereof and a rail supporting the blade, said blade and rail being slidably connected to each other by a joint incorporating two guide ways formed respectively in said blade and said rail and extending transversely of the wire, the guide way of the blade comprising two projections and the guide way of the rail comprising two grooves, at least one of said grooves being a combined T-and fishtail groove having a T-groove surface and a fishtail groove surface, said surfaces forming an obtuse included angle.
Claim 3
Dependent Claim
19 words
A dewatering device according to claim 1, wherein both grooves of the supporting rail are combined T-and fishtail grooves.
Claim 4
Dependent Claim
56 words
A dewatering device according to claim 1, wherein one of said grooves is formed as a combined T-and fishtail groove and the other of said grooves is defined by a separate guide member attachable to the body of the rail, said guide member together with the body of the rail forming a combined T-and fishtail groove.
Claim 5
Dependent Claim
65 words
A dewatering device according to claim 1, wherein one of said grooves if formed as a combined T-and fishtail groove and the other of said grooves is defined by alternative guide members attachable to the body of the rail, a first of said guide members being shaped to form a T-groove and the other of said guide members being shaped to form a fishtail groove.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |