US3874998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agitator blade for use below forming wire of paper making machine
Assignee: Jwi Ltd
•
Filing: 1973-07-23
•
Granted: 1975-04-01
•
Expires: 1993-07-23
Abstract
Abstract An agitating blade located beneath the forming wire of a paper making machine comprises an elongated bar having a top face provided with coplanar upstream and downstream support surfaces for the forming wire intervened by a surface which forms a depression or an agitating channel, and a bottom face provided with T-shaped slot means for slidable attachment to a support member on the paper machine. The surface forming the depression may be curved or may have flat upstream and downstream walls which may be intervened by a bottom wall. The surface of the depression diverges downstream from the upstream support surface at an angle from about 1* to about 8*. The blade width in the machine direction may range from about 1 1/2 inches to about 15 inches. Wear-resistant inserts may be employed in the upstream and downstream support surfaces for the forming wire, and more than one agitating channel may be employed within one elongated bar.
Inventors
- 👤 Dale Bernard Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:50
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/18; D21F1/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
155 words
An attachable-detachable agitating device for placing in supporting relationship to the forming wire of a paper making machine and extending thereacross transversely of the direction of wire travel, comprising, a blade having a relatively narrow elongated thin body provided with a top face, a bottom, and free upstream and free downstream faces, the body being provided with a keying slot entering at the bottom and extending the length of the body for sildably receiving a complementary shaped key support member of the paper machine, the top face being provided with an upstream support surface terminating in an upstream edge where the wire first encounters the blade, a downstream support surface terminating in a downstream edge where the wire leaves the blade and an intermediate surface extending downwardly from the upstream support surface and upwardly to the downstream support surface to provide an agitating channel for drawing water from and forcibly returning it to the stock.
Claim 2
Dependent Claim
155 words
An attachable-detachable agitating device for placing in supporting relationship to the forming wire of a paper making machine and extending thereacross transversely of the direction of wire travel, comprising, a blade having a relatively narrow elongated thin body provided with a top face, a bottom, and free upstream and free downstream faces, the body being provided with a keying slot entering at the bottom and extending the length of the body for sildably receiving a complementary shaped key support member of the paper machine, the top face being provided with an upstream support surface terminating in an upstream edge where the wire first encounters the blade, a downstream support surface terminating in a downstream edge where the wire leaves the blade and an intermediate surface extending downwardly from the upstream support surface and upwardly to the downstream support surface to provide an agitating channel for drawing water from and forcibly returning it to the stock.
Claim 3
Dependent Claim
19 words
A device, as defined in claim 1, in which the surface of the said intermediate surface is curved throughout.
Claim 4
Dependent Claim
25 words
A device, as defined in claim 1, in which the said intermediate surface has a flat upstream wall at an angle to the support surfaces.
Claim 5
Dependent Claim
31 words
A device, as defined in claim 1, in which the said intermediate surface has a flat upstream wall and a flat downstream wall each at an angle to the support surfaces.
Claim 6
Dependent Claim
20 words
A device, as defined in claim 1, in which the upstream and downstream walls are intervened by a bottom wall.
Claim 7
Dependent Claim
33 words
A device, as defined in any of claim 1, in which the surface of said intermediate surface diverges downstream from the upstream support surface at an angle from about 1* to about 8*.
Claim 8
Dependent Claim
24 words
A device, as defined in claim 1, in which the width in the machine direction is between about 1 1/2 and about 15 inches.
Claim 9
Dependent Claim
27 words
A device, as defined in claim 1, in which tHe means for attachment to the paper machine is a T-shaped slot entering the bottom of the blade.
Claim 10
Dependent Claim
23 words
A device, as defined in claim 1, which is provided with a wear-resistant insert at the downstream end of the upstream support surface.
Claim 11
Dependent Claim
23 words
A device, as defined in claim 1, which is provided with a wear-resistant insert at the upstream end of the downstream support surface.
Claim 12
Dependent Claim
33 words
A device, as defined in claim 1, which is provided with respective wear-resistant inserts at the downstream end of the upstream support surface and at the upstream end of the downstream support surface.
Claim 13
Dependent Claim
19 words
A device, as defined in claim 1, which is provided with a spaced-apart means forming multiple parallel agitating channels.
Claim 14
Dependent Claim
165 words
A paper machine, comprising, a frame, upstream and downstream means on said frame carrying and endless forming wire for a run therebetween, through an initial dewatering section of an upper run, a plurality of separate thin elongated blades with means for removably mounting on the frame and extending from one side to the other of the forming wire and having supporting surfaces contacting the undersurface of the upper run of the wire, at least one of the blades in said dewatering section being an agitating blade having upstream and downstream wire supporting surface intervened by means sloping downwardly and then upwardly, and forming therebetween an agitating channel for agitating the fibers by drawing water from the web and passing it back again through the forming wire, a next adjacent downstream blade being spaced from said agitating blade to provide between it and the agitating blade a free space across which the wire runs open to the atmosphere to permit subsidence of turbulence in the web.
Claim 15
Dependent Claim
165 words
A paper machine, comprising, a frame, upstream and downstream means on said frame carrying and endless forming wire for a run therebetween, through an initial dewatering section of an upper run, a plurality of separate thin elongated blades with means for removably mounting on the frame and extending from one side to the other of the forming wire and having supporting surfaces contacting the undersurface of the upper run of the wire, at least one of the blades in said dewatering section being an agitating blade having upstream and downstream wire supporting surface intervened by means sloping downwardly and then upwardly, and forming therebetween an agitating channel for agitating the fibers by drawing water from the web and passing it back again through the forming wire, a next adjacent downstream blade being spaced from said agitating blade to provide between it and the agitating blade a free space across which the wire runs open to the atmosphere to permit subsidence of turbulence in the web.
Claim 16
Dependent Claim
21 words
A paper machine, as defined in claim 13, in which there are a plurality of said agitating blades mounted in series.
Claim 17
Dependent Claim
24 words
A paper machine, as defined in claim 13, in which there is at least one foil blade mounted in series with the agitating blade.
Claim 18
Dependent Claim
17 words
A paper machine, as defined in claim 13, in which foil blades and agitating blades are interspersed.
References Cited (Backward Citations)
US3337394A
Cited
US3446702A
Cited
US3489644A
Cited
US3463700A
Cited
US3573159A
Cited
US3778342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |