US3779381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sizing screens
Assignee: Coal Industry Patents Ltd
•
Filing: 1971-07-27
•
Granted: 1973-12-18
•
Expires: 1991-07-27
Abstract
Abstract A sizing screen for particulate material of different sizes has a series of generally horizontal circular screen surfaces which are rotated about a vertical axis so that undersize material passes through the surface and is collected in a central chute and oversize material is ejected from the periphery of the surface and collected in a peripheral chute. With the various embodiments described it is possible to retreat both the undersize and the oversize material, or solely the undersize material, or solely the oversize material.
Inventors
- 👤 M Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:03
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
A sizing screen comprising a hub assembly, a screen surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, means for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating the surface.
Claim 2
Dependent Claim
87 words
A sizing screen comprising a hub assembly, a screen surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, means for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating the surface.
Claim 3
Dependent Claim
21 words
A sizing screen as claimed in claim 1, in which the elongated members are in the form of spring steel rods.
Claim 4
Dependent Claim
31 words
A sizing screen as claimed in claim 2, in which said hub assembly comprises a plurality of radial bores, said one end of said rods being located in said radial bores.
Claim 5
Dependent Claim
27 words
A sizing screen as claimed in claim 2, in which the rods are pivotally connected with respect to the hub assembly for movement about a horizontal axis.
Claim 6
Dependent Claim
111 words
A sizing screen comprising a hub assembly, a plurality of coaxially arranged and spaced apart circular screen surfaces, each said surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, means for feeding material onto the uppermost screen surface, first collection means positioned adjacent to the outer periphery of the screen surfaces for collecting oversize material from at least the lowermost screen surface, second collection means positioned below the lowermost screen surface for collecting undersize material, and drive means for rotating the screen surfaces.
Claim 7
Dependent Claim
111 words
A sizing screen comprising a hub assembly, a plurality of coaxially arranged and spaced apart circular screen surfaces, each said surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, means for feeding material onto the uppermost screen surface, first collection means positioned adjacent to the outer periphery of the screen surfaces for collecting oversize material from at least the lowermost screen surface, second collection means positioned below the lowermost screen surface for collecting undersize material, and drive means for rotating the screen surfaces.
Claim 8
Dependent Claim
23 words
A sizing screen as claimed in claim 5, in which the screen surfaces have the same outer diameter with respect to each other.
Claim 9
Dependent Claim
22 words
A sizing screen as claimed in claim 5, in which the screen surfaces have different outer diameters with respect to each other.
Claim 10
Dependent Claim
98 words
A sizing screen comprising a hub assembly, a circular screen surface consisting solely of a plurality of eLongated members projecting at one end from the hub assembly, said elongated members being unsupported and unobstructed at the other end, said screen surface being mounted for rotation about a generally vertical axis and being arranged to vibrate, means for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating and vibrating said surface.
Claim 11
Dependent Claim
98 words
A sizing screen comprising a hub assembly, a circular screen surface consisting solely of a plurality of eLongated members projecting at one end from the hub assembly, said elongated members being unsupported and unobstructed at the other end, said screen surface being mounted for rotation about a generally vertical axis and being arranged to vibrate, means for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating and vibrating said surface.
Claim 12
Dependent Claim
97 words
A sizing screen comprising a hub assembly, a circular screen surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, said surface being inclined to the axis of rotation, means for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating said surface.
Claim 13
Dependent Claim
97 words
A sizing screen comprising a hub assembly, a circular screen surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, said surface being inclined to the axis of rotation, means for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating said surface.
Claim 14
Dependent Claim
92 words
A sizing screen comprising a hub assembly, a circular screen surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, means including material mixing apparatus for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating said surface.
Claim 15
Dependent Claim
92 words
A sizing screen comprising a hub assembly, a circular screen surface consisting solely of a plurality of elongated members projecting at one end from the hub assembly and mounted for rotation about a generally vertical axis, said elongated members being unsupported and unobstructed at the other end, means including material mixing apparatus for feeding material onto the surface, first collection means positioned adjacent to the outer periphery of the surface for collecting oversize material, second collection means positioned below the surface for collecting undersize material, and drive means for rotating said surface.
References Cited (Backward Citations)
US91549A
Cited
US753440A
Cited
US838441A
Cited
US1075942A
Cited
DE361035C
Cited
US1872301A
Cited
US3047147A
Cited
US3100746A
Cited
US3061095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |