US3856619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermaking machine headbox with slice chamber containing flexible trailing elements having extended edges
Assignee: Beloit Corp
•
Filing: 1973-03-07
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Granted: 1974-12-24
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Expires: 1993-03-07
Abstract
Abstract A headbox structure for feeding a slurry of stock onto a traveling forming surface for a paper making machine including a tapering slice chamber with a slice opening and trailing elements positioned in the slice chamber extending in a downstream direction with the elements being unattached at their downstream edges and being self-positionable responsive to pressures of stock flowing past the element with the edges of the elements adjacent the pond sides being extended for obtaining a more uniform stock delivery and basis weight of paper web.
Inventors
- 👤 G Davidson
- 👤 D Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:06
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/026; D21F1/028
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising: a trailing element means positioned in the slice chamber extending in a downstream direction; means supporting the upstream end of said trailing element means; said element means being unattached at its downstream edge and being self-positionable responsive to pressures of stock flowing past the element means toward the slice opening, said element means extending in a direction transversely of the slice chamber and substantially to the pond side of the slice chamber, said element means having a downstream edge and having a longer portion extending further toward the slice opening at the pond side than the portion inwardly therefrom.
Claim 2
Dependent Claim
122 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement comprising: a trailing element means positioned in the slice chamber extending in a downstream direction; means supporting the upstream end of said trailing element means; said element means being unattached at its downstream edge and being self-positionable responsive to pressures of stock flowing past the element means toward the slice opening, said element means extending in a direction transversely of the slice chamber and substantially to the pond side of the slice chamber, said element means having a downstream edge and having a longer portion extending further toward the slice opening at the pond side than the portion inwardly therefrom.
Claim 3
Dependent Claim
33 words
In a headbox for delivering stock to a forming surface, the headbox having slice chamber and a slice opening, the improvement construCted in accordance with claim 1: wherein said element means is flexible.
Claim 4
Dependent Claim
34 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement constructed in accordance with claim 1: wherein said element means is rigid.
Claim 5
Dependent Claim
35 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement constructed in accordance with claim 1: wherein said element means includes multiple strands.
Claim 6
Dependent Claim
52 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement constructed in accordance with claim 1: wherein said element means extends transversely across the headbox continuous for the full width of the slice chamber substantially to both the pond sides.
Claim 7
Dependent Claim
53 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement constructed in accordance with claim 1: wherein said element means includes a plurality of separate elements spaced apart in a direction vertically relative to the horizontal extent of the slice chamber.
Claim 8
Dependent Claim
42 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement constructed in accordance with claim 1: wherein the ends of the element means adjacent the pond sides are triangular shaped.
Claim 9
Dependent Claim
38 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement constructed in accordance with claim 1: wherein the elements adjacent the pond sides are curved shaped.
Claim 10
Dependent Claim
62 words
In a headbox for delivering stock to a forming surface, the headbox having a slice chamber and a slice opening, the improvement constructed in accordance with claim 1: wherein the element means adjacent the downstream edge portion adjacent the pond sides extends parallel to the slice opening for a short distance and then angles in a direction away from the slice opening.
References Cited (Backward Citations)
US3607625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |