US3677402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal classifier
Assignee: Finckh Hermann Metalltuch und Maschinenfabrik
•
Filing: 1970-09-17
•
Granted: 1972-07-18
•
Expires: 1990-09-17
Abstract
Abstract A centrifugal classifier for sorting suspensions of fibrous materials has a housing with an intake defined in the upper region thereof. A stationary sieve basket is arranged with its axis vertically oriented in the housing and defines a plurality of perforations of a predetermined size. A rotatable sieve basket is mounted adjacent and coaxial with respect to the stationary basket and extends beyond the upper edge of the stationary basket to the vicinity of the intake. A plurality of perforations are also defined in the rotatable basket, the perforations in the lower region being of a predetermined size larger than the perforations in the stationary basket and the perforations in the upper end being of a predetermined size larger than the perforations in the lower region of the rotatable basket. The suspension flows from the largest to the smallest perforations.
Inventors
- 👤 Emil Holz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:34
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/02; D21D5/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
190 words
Centrifugal classifier for sorting suspensions of fibrous materials, comprising, in combination: a. a housing having an upper region with a periphery; b. an intake in the periphery of the upper region of said housing; c. a stationary sieve basket arranged in said housing to have a vertically oriented axis and defining an upper edge and a plurality of perforations of a predetermined size; d. a rotatable sieve basket mounted adjacent, inside and coaxially with respect to said stationary basket and having an upper region with an extended portion extending beyond the upper edge of said stationary basket to the vicinity of said intake and a lower region, said rotatable sieve basket defining a plurality of perforations, the perforatIons in the lower region of said rotatable basket being of a predetermined size and larger than the perforations in said stationary basket and the perforations in the upper region of said rotatable basket being of a predetermined size and larger than the perforations in the lower region of said rotatable basket so that a suspension may flow from the largest perforations to the smallest perforations, and material outlet means in said housing.
Claim 2
Dependent Claim
190 words
Centrifugal classifier for sorting suspensions of fibrous materials, comprising, in combination: a. a housing having an upper region with a periphery; b. an intake in the periphery of the upper region of said housing; c. a stationary sieve basket arranged in said housing to have a vertically oriented axis and defining an upper edge and a plurality of perforations of a predetermined size; d. a rotatable sieve basket mounted adjacent, inside and coaxially with respect to said stationary basket and having an upper region with an extended portion extending beyond the upper edge of said stationary basket to the vicinity of said intake and a lower region, said rotatable sieve basket defining a plurality of perforations, the perforatIons in the lower region of said rotatable basket being of a predetermined size and larger than the perforations in said stationary basket and the perforations in the upper region of said rotatable basket being of a predetermined size and larger than the perforations in the lower region of said rotatable basket so that a suspension may flow from the largest perforations to the smallest perforations, and material outlet means in said housing.
Claim 3
Dependent Claim
49 words
The centrifugal classifier defined in claim 1, further including a coarse material trough and an associated discharge pipe arranged outside of said sieve basket and below the extended portion of said rotating sieve basket to receive coarse material to large to pass through the perforations in said extended portion.
Claim 4
Dependent Claim
73 words
The centrifugal classifier defined in claim 2, further including an annular baffle member arranged in said housing between said intake and said extended portion, said baffle member having an upper portion defining an upper edge which cooperates with a portion of said housing to define a passage between said intake and said extended portion, and further having a lower portion defining a lower edge and arranged to extend into said coarse material trough.
Claim 5
Dependent Claim
22 words
The centrifugal classifier defined in claim 3, wherein said annular baffle member has a cylindrical lower portion and a conical upper portion.
Claim 6
Dependent Claim
51 words
The centrifugal classifier defined in claim 4, further including a slop material trough and an associated discharge pipe arranged below said rotatable sieve basket for receiving material too large to pass through the perforations in the lower region of said rotatable sieve basket and the perforations in said stationary sieve basket.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |