US4166028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for screening paper fiber stock
Assignee: Black Clawson Co
•
Filing: 1976-05-20
•
Granted: 1979-08-28
•
Expires: 1996-05-20
Abstract
Abstract In screening apparatus for paper fiber stock of the type wherein a cylindrical perforate screen member defines screening and accepts chamber on the inner and outer sides thereof in a closed housing, the inlet chamber for stock to be screened is located below the screening chamber, and the reject chamber for accumulating reject material is located above the screening chamber. Provision is made for retaining high specific gravity materials within the inlet chamber and for trapping and removing them therefrom without ever reaching the screen chamber. In addition, provision is made for developing centrifugal force effective to concentrate low specific gravity materials, such as bits of plastic foam, in the central part of the reject chamber, and a discharge outlet from the reject chamber located generally centrally of its top wall assures elimination of such light reject materials.
Inventors
- 👤 Arnulf E. M. Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:25
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/023; D21D5/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
227 words
Screening apparatus for paper fiber stock comprising: (a) a generally cylindrical vertical housing, (b) means defining an inlet chamber in the lower end of said housing and including a tangentially arranged stock inlet port to said chamber, (c) screen means including a cylindrical perforate screen member supported in an intermediate portion of said housing above said inlet chamber and separating said portion into a screening chamber and an annular accepts chamber on the inner and outer sides of said screen member respectively, (d) means cooperating with said inlet chamber to receive and retain high specific gravity materials entering through said stock inlet, (e) reject outlet means for discharging such retained high specific gravity materials from said inlet chamber, (f) means defining a reject chamber above said screening chamber for receiving reject materials therefrom, (g) rotor means mounted for rotation in said screening chamber and including a hub having vane means mounted thereon in angularly spaced relation, (h) means for driving said rotor means to accentuate circulatory movement of the stock in said screening and reject chambers and concentration of materials of lower specific gravity than paper fibers in the central portion of said reject chamber, (i) top wall means for said reject chamber, and (j) means defining an outlet port located generally centrally of said top wall means for discharge of reject materials from said reject chamber.
Claim 2
Dependent Claim
227 words
Screening apparatus for paper fiber stock comprising: (a) a generally cylindrical vertical housing, (b) means defining an inlet chamber in the lower end of said housing and including a tangentially arranged stock inlet port to said chamber, (c) screen means including a cylindrical perforate screen member supported in an intermediate portion of said housing above said inlet chamber and separating said portion into a screening chamber and an annular accepts chamber on the inner and outer sides of said screen member respectively, (d) means cooperating with said inlet chamber to receive and retain high specific gravity materials entering through said stock inlet, (e) reject outlet means for discharging such retained high specific gravity materials from said inlet chamber, (f) means defining a reject chamber above said screening chamber for receiving reject materials therefrom, (g) rotor means mounted for rotation in said screening chamber and including a hub having vane means mounted thereon in angularly spaced relation, (h) means for driving said rotor means to accentuate circulatory movement of the stock in said screening and reject chambers and concentration of materials of lower specific gravity than paper fibers in the central portion of said reject chamber, (i) top wall means for said reject chamber, and (j) means defining an outlet port located generally centrally of said top wall means for discharge of reject materials from said reject chamber.
Claim 3
Dependent Claim
71 words
Screening apparatus as defined in claim 1 wherein said means (d) comprise means defining an inlet flow passage to said screening chamber from said inlet chamber which is of smaller inner diameter than said inlet chamber to provide an annular space around the periphery of said inlet chamber wherein high specific gravity materials entering through said stock inlet port are concentrated by the centrifugal force developed in the tangentially entering stock.
Claim 4
Dependent Claim
34 words
Screening apparatus as defined in claim 2 wherein said reject outlet means includes a port tangentially arranged in the opposite orientation from said inlet port to remove and trap such high specific gravity materials.
Claim 5
Dependent Claim
33 words
Screening apparatus as defined in claim 1 wherein said rotor means includes vane means arranged to impart upward movement to said reject chamber of particles too large for passage through said screen member.
Claim 6
Dependent Claim
66 words
Screening apparatus as defined in claim 1 wherein said rotor means includes a hub, a plurality of vanes located in closely inwardly spaced relation with the inner surface of said screen member, and an essentially imperforate arm supporting each said vane on said hub member, each said arm presenting a leading surface functioning as a blade causing continuous circulatory movement of stock in said screening chamber.
Claim 7
Dependent Claim
64 words
Screening apparatus as defined in claim 5 wherein said arms and said vanes are inclined with respect to the axis of said rotor means to introduce an axial component into the circulatory movement of the stock in said screening chamber to promote movement to said reject chamber of low specific gravity materials and other reject materials too large for passage through said screen member.
Claim 8
Dependent Claim
41 words
Screening apparatus as defined in claim 1 further comprising means defining an inlet port to said reject chamber for admission of liquid to dilute reject material accumulating in said reject chamber and thereby to facilitate discharge thereof through said outlet port.
Claim 9
Dependent Claim
30 words
Screening apparatus as defined in claim 1 wherein said top wall means comprises a dome-shaped top wall for funneling the contents of said reject chamber to said reject outlet port.
References Cited (Backward Citations)
US2849117A
Cited
US2347716A
Cited
US3159572A
Cited
US3145165A
Cited
US3255883A
Cited
US3363759A
Cited
US3400820A
Cited
US3458038A
Cited
US3680696A
Cited
US3970548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-27 | 1983-02-26 | 1983-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-27 | 1987-02-26 | 1987-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-27 | 1991-02-26 | 1991-08-28 | $7700.00 | Window Closed / Lapsed |