US3637460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewatering apparatus
Assignee: Huyck Corp
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Filing: 1967-08-15
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Granted: 1972-01-25
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Expires: 1987-08-15
Abstract
Abstract This invention relates to dewatering devices for use in the forming section of papermaking machines. A preferred embodiment comprises an enclosure, the top of which is open to the underside of the forming medium with which it is associated, at least one of the sidewalls of which has a concave lower portion extending into an upturned lip, thereby forming a pocket in which effluent drawn through the forming medium will collect and a second member coextensive with, and having a portion spaced from and within, said concave portion to form a channel that will provide a means for discharging excess effluent from the pocket while keeping the pocket at least partially filled with effluent so as to maintain a seal between the inside of the enclosure and the surrounding air.
Inventors
- 👤 Peter James Newsom
- 👤 William G Smith
- 👤 Robert Anthony Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:50
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/48; D21F1/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
In a dewatering unit for use in the forming section of a papermaking machine, said unit being disposed below the forming medium, said unit having oppositely disposed sidewalls extending transverse to the direction of travel of the forming medium and end walls connecting said sidewalls, at least one of said sidewalls having a concave lower portion extending to an upturned lip forming a pocket in which effluent drawn through the forming medium is collected, a member coextensive with one of said sidewalls and having a portion spaced from said upturned lip and disposed within said concave portion to form a channel therebetween, said channel providing means for discharging excess effluent from said pocket, said channel, when said unit is in use, being at least partially filled with effluent so as to maintain a seal between the inside of said unit and the surrounding air.
Claim 2
Dependent Claim
144 words
In a dewatering unit for use in the forming section of a papermaking machine, said unit being disposed below the forming medium, said unit having oppositely disposed sidewalls extending transverse to the direction of travel of the forming medium and end walls connecting said sidewalls, at least one of said sidewalls having a concave lower portion extending to an upturned lip forming a pocket in which effluent drawn through the forming medium is collected, a member coextensive with one of said sidewalls and having a portion spaced from said upturned lip and disposed within said concave portion to form a channel therebetween, said channel providing means for discharging excess effluent from said pocket, said channel, when said unit is in use, being at least partially filled with effluent so as to maintain a seal between the inside of said unit and the surrounding air.
Claim 3
Dependent Claim
24 words
A dewatering unit as described in claim 1 wherein said coextensive member comprises an extension of the other one of said oppositely disposed sidewalls.
Claim 4
Dependent Claim
162 words
A dewatering unit for use in the forming section of a papermaking machine, said unit being disposed below the forming medium and having an upper surface in contact with the undersurface thereof, said unit having oppositely disposed sidewalls extending transverse to the direction of travel of the forming medium and end walls connecting said sidewalls, one of said sidewalls extending in a generally downward direction and having a generally concave lower portion extending into an upturned lip portion, said concave portion providing a pocket for collecting effluent drawn through the forming medium, the other of said sidewalls extending in a generally downward direction, the lower portion of said other sidewall being overlapped with a portion with said upturned lip and spaced therefrom so as to form a channel therebetween, said channel providing means for discharging excess effluent and said channel, when in use, beinG partially filled with effluent so as to provide a seal and prevent atmospheric pressure from entering said unit.
Claim 5
Dependent Claim
162 words
A dewatering unit for use in the forming section of a papermaking machine, said unit being disposed below the forming medium and having an upper surface in contact with the undersurface thereof, said unit having oppositely disposed sidewalls extending transverse to the direction of travel of the forming medium and end walls connecting said sidewalls, one of said sidewalls extending in a generally downward direction and having a generally concave lower portion extending into an upturned lip portion, said concave portion providing a pocket for collecting effluent drawn through the forming medium, the other of said sidewalls extending in a generally downward direction, the lower portion of said other sidewall being overlapped with a portion with said upturned lip and spaced therefrom so as to form a channel therebetween, said channel providing means for discharging excess effluent and said channel, when in use, beinG partially filled with effluent so as to provide a seal and prevent atmospheric pressure from entering said unit.
Claim 6
Dependent Claim
23 words
A dewatering unit as described in claim 3 wherein the surface in engagement with the forming medium includes at least one hydrofoil blade.
Claim 7
Dependent Claim
42 words
A dewatering unit as described in claim 3 wherein said unit is a suction box, said surface in engagement with the forming medium comprising a surface having more than a single opening through which a vacuum is applied to the forming medium.
Claim 8
Dependent Claim
177 words
A dewatering unit for use in the forming section of a papermaking machine, said unit being disposed below a forming medium and having an upper surface in contact therewith, said unit having oppositely disposed sidewalls extending transverse to the path of travel of the forming medium and end walls for connecting said sidewalls, each of said sidewalls having a concave lower portion providing a pocket in which effluent drawn through the forming medium is collected, each of said concave portions extending into an upturned lip, said unit further including a transverse member extending between said end walls and disposed between said sidewalls, said transverse member having downwardly directed lateral edges which extend into the concave lower portions of said sidewalls, said lateral edges being overlapped with and spaced from said upturned lips so as to form a channel between each, said channels providing means for discharging excess effluent from said unit, said channels also, when in use, being at least partially filled with effluent so as to provide a seal between said sidewalls and said transverse member.
Claim 9
Dependent Claim
177 words
A dewatering unit for use in the forming section of a papermaking machine, said unit being disposed below a forming medium and having an upper surface in contact therewith, said unit having oppositely disposed sidewalls extending transverse to the path of travel of the forming medium and end walls for connecting said sidewalls, each of said sidewalls having a concave lower portion providing a pocket in which effluent drawn through the forming medium is collected, each of said concave portions extending into an upturned lip, said unit further including a transverse member extending between said end walls and disposed between said sidewalls, said transverse member having downwardly directed lateral edges which extend into the concave lower portions of said sidewalls, said lateral edges being overlapped with and spaced from said upturned lips so as to form a channel between each, said channels providing means for discharging excess effluent from said unit, said channels also, when in use, being at least partially filled with effluent so as to provide a seal between said sidewalls and said transverse member.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |