US3861230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tensioning apparatus for blanket and wires in paper machines
Assignee: Thune Eureka AS
•
Filing: 1973-08-31
•
Granted: 1975-01-21
•
Expires: 1993-08-31
Abstract
Abstract A tension roll bearing at each end of the tension roll, in a tensioning apparatus for blanket and wires, is pivotally mounted on a carriage by an arm, so that the tension roll can be pivoted for tensioning or slacking of the blanket/wire. A bellows is connected between the bearing/arm of the tension roll and the carriage, the bellows being maintained at below a determined air pressure. On the arm/bearing, and on the carriage, cooperating switch members are arranged for starting and stopping a screw spindle motor in accordance with the pivotal movement of the tension roll bearing to return the bearing of the arm/tension roll to normal position, whereby the adjusted tension in the blanket/wire is regained.
Inventors
- 👤 Oskar Brovoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:44
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/36; D21F1/365
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
205 words
A web tensioning device comprising guide means, carriage means mounted for movement on said guide means, a tensioning roll for a said web, arms carrying said tensioning roll, means mounting said arms on the carriage means for pivotal movement about an axis parallel to the axis of the tensioning roll, fluid pressure means acting between said arms and said carriage means to swing sAid arms in a direction to tension the web, switch means having cooperating switch members on a said arms and on the carriage means for actuation upon predetermined pivotal movement of said arms, and means responsive to actuation of said switch means to move said carriage means on said guide means in a direction to restore said arms to a predetermined position relative to said carriage means, said arms having an operating nose thereon, said switch means comprising three end switches mounted on said carriage means for contact with said nose upon pivoting of said arms, a central one of said three switches deactuating said carriage moving means when said predetermined position of said arms relative to said carriage means is reached, and the other two switches actuating said carriage moving means for movement in respectively opposite directions on said guide means.
Claim 2
Dependent Claim
205 words
A web tensioning device comprising guide means, carriage means mounted for movement on said guide means, a tensioning roll for a said web, arms carrying said tensioning roll, means mounting said arms on the carriage means for pivotal movement about an axis parallel to the axis of the tensioning roll, fluid pressure means acting between said arms and said carriage means to swing sAid arms in a direction to tension the web, switch means having cooperating switch members on a said arms and on the carriage means for actuation upon predetermined pivotal movement of said arms, and means responsive to actuation of said switch means to move said carriage means on said guide means in a direction to restore said arms to a predetermined position relative to said carriage means, said arms having an operating nose thereon, said switch means comprising three end switches mounted on said carriage means for contact with said nose upon pivoting of said arms, a central one of said three switches deactuating said carriage moving means when said predetermined position of said arms relative to said carriage means is reached, and the other two switches actuating said carriage moving means for movement in respectively opposite directions on said guide means.
Claim 3
Dependent Claim
14 words
A device as claimed in claim 1, said fluid pressure means comprising a bellows.
Claim 4
Dependent Claim
64 words
A device as claimed in claim 1, said guide means comprising two guide members parallel to each other, said carriage means comprising two interconnected carriages one on each said guide member, there being a said arm on each said carriage and a said pressure fluid means individual to each said arm, and a common source of fluid pressure for the two fluid pressure means.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |