US3607625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headbox
Assignee: Beloit Corp
•
Filing: 1968-01-17
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Granted: 1971-09-21
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Expires: 1988-01-17
Abstract
Abstract A headbox construction for a papermaking machine which comprises a slice chamber connected to a preslice flow chamber by means of a perforate member. The slice chamber contains a plurality of plates and/or filaments attached to said perforate member and extend in the direction of stock flow through said slice chamber and define therein a multiplicity of relatively narrow channels of decreasing cross-sectional area in the direction of flow.
Inventors
- 👤 Lester M Hill
- 👤 Joseph D Parker
- 👤 Richard E Hergert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:24
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/028
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
20 words
The structure of claim 1 wherein the transverse cross-sectional area of said elements decreases in the direction of stock flow.
Claim 2
Dependent Claim
21 words
The structure of claim 2 wherein the transverse cross-sectional area of said slice chamber decreases in the direction of stock flow.
Claim 3
Dependent Claim
102 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 plurality of rigid plates positioned in the slice chamber, each of said plates extending transversely of said headbox and projecting downstream generally in the direction of stock flow, and trailing elements attached to the downstream ends of said plates, said elements being attached to said plates only at their upstream ends with their downstream portions unaTtached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing towards the slice.
Claim 4
Dependent Claim
19 words
The structure of claim 4 wherein said elements are in the form of sheets extending transversely of said headbox.
Claim 5
Dependent Claim
15 words
The structure of claim 4 wherein said elements are in the form of flexible rods.
Claim 6
Dependent Claim
15 words
The structure of claim 7 wherein the transverse cross-sectional area of said rods is triangular.
Claim 7
Dependent Claim
19 words
The structure of claim 6 wherein the transverse cross-sectional area of said rods decreases in the direction of flow.
Claim 8
Dependent Claim
19 words
The structure of claim 4 wherein the transverse cross-sectional area of said elements decreases in the direction of flow.
Claim 9
Dependent Claim
115 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 plurality of rigid members positioned in the slice chamber, each of said members projecting downstream generally in the direction of stock flow, means supporting said members only at their upstream ends at locations spaced generally perpendicular to the stock flow stream, and trailing elements attached to the downstream ends of said members, said elements being attached to said members only at their upstream ends with their downstream portions unattached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing towards the slice.
Claim 10
Dependent Claim
10 words
The structure of claim 10 wherein said means comprise tubes.
Claim 11
Dependent Claim
74 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 positioned in the slice chamber, said element extending transversely of said headbox, means anchoring said element only at its upstream end with its downstream portion unattached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing towards the slice.
Claim 12
Dependent Claim
99 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 rigid plate positioned in the slice chamber, said plate extending transversely of said headbox and projecting downstream generally in the direction of stock flow, and a trailing element attached to the downstream end of said plate, said element being attached to said plate only at its upstream end with its downstream portion unattached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing towards the slice.
Claim 13
Dependent Claim
101 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 rigid member positioned in the slice chamber, said member projecting downstream generally in the direction of stock flow, means supporting said member only at its upstream end and trailing elements attached to the downstream end of said member, said elements being attached to said member only at their upstream ends with their downstream portions unattached and constructed to be self-positionable so as to be solely responsive to forces exerted thereon by the stock flowing towards the slice.
References Cited (Backward Citations)
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Cited
US2394509A
Cited
US2832268A
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US3135650A
Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |