Patent EP0113859A1 successfully refreshed from Google Patents.
US3754715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for size reduction and collection of solid materials
Assignee: Individual
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Filing: 1971-08-16
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Granted: 1973-08-28
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Expires: 1991-08-16
Abstract
Abstract A combined size reduction mill and collector for forming powdered samples having an enclosed cylindrical chamber including an upright wall provided with an abrasive surface throughout a greater portion of its circumferential extent and a perforate surface throughout its remaining extent, an inlet at the top of the chamber for gravitational feed of commodities to its interior, baffle means disposed in the chamber between a zone of material deposit and the perforate surface, a rotary impeller in horizontal alignment with the abrasive surface and inwardly thereof, a discharge outlet from the chamber exteriorly of the perforate surface, a conduit connecting said outlet with the feed intake of a cyclone collector, and means for imparting a centrifugal flow to matter entering the cyclone collector so as to pass substantially the entire product to a lower discharge outlet and holding receptacle. The combined size reduction mill and collector also includes a helical path formed adjacent the inlet of the cyclone collector and facing toward said collector''s underflow outlet, the distance separating the impeller blades from the abrasive and perforate surfaces is equal to approximately the diameter of the material to be fed into the grinding chamber, and the material traveling within said grinding chamber undegoes an abrupt change in direction of flow upon traveling to the inlet to the cyclone collector.
Inventors
- 👤 D Udy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:30
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/04; G01N1/28; G01N1/286; G01N2001/2866
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
339 words
In a size reduction mill and collector apparatus for forming powdered samples; a housing, means defining a grinding chamber in said housing having a vertically extending cylindrical side wall terminating at upper and lower end walls, abrasive means on said side wall extending around a major portion of the circumferential extent of said side wall, impeller means mounted in said chamber for rotation coaxially of said side wall, said impeller means having a plurality of blades extending radially from its rotative axis and terminating at outer ends spaced radially inwardly from said side wall, the distance separating said outer ends of said blades and inner surface of said side wall being equal to approximately the diameter of the material to be fed into the grinding chamber whereby a substantial portion of the material to be ground within said grinding chamber will pass between the outer ends of said blades and said inner surface without causing substantial wear of the outer ends of said blades, drive means for driving said impeller in rotary movement, inlet means on said housing having an inlet opening through said upper wall into said chamber in coaxial alignment with said impeller, outlet means for said grinding chamber, said perforate screen means being disposed intermediate said grinding chamber and said outlet means, the longitudinal axis of said outlet means forming an acute angle with a line disposed tangent to said perforate screen means, said outlet means extending away from said grinding chamber in a direction generally opposite to the direction of rotation of the outer ends of said blades adjacent said perforate screen means whereby the material being ground within said grinding chamber must undergo a change in direction of flow upon leaving said chamber and entering said outlet means, and baffle means projecting downwardly from said upper wall into said chamber and extending around the portion of said inlet opening aligned radially of said axis with said perforate screen means to block direct radial movement of material from said inlet opening to said screen means.
Claim 2
Dependent Claim
339 words
In a size reduction mill and collector apparatus for forming powdered samples; a housing, means defining a grinding chamber in said housing having a vertically extending cylindrical side wall terminating at upper and lower end walls, abrasive means on said side wall extending around a major portion of the circumferential extent of said side wall, impeller means mounted in said chamber for rotation coaxially of said side wall, said impeller means having a plurality of blades extending radially from its rotative axis and terminating at outer ends spaced radially inwardly from said side wall, the distance separating said outer ends of said blades and inner surface of said side wall being equal to approximately the diameter of the material to be fed into the grinding chamber whereby a substantial portion of the material to be ground within said grinding chamber will pass between the outer ends of said blades and said inner surface without causing substantial wear of the outer ends of said blades, drive means for driving said impeller in rotary movement, inlet means on said housing having an inlet opening through said upper wall into said chamber in coaxial alignment with said impeller, outlet means for said grinding chamber, said perforate screen means being disposed intermediate said grinding chamber and said outlet means, the longitudinal axis of said outlet means forming an acute angle with a line disposed tangent to said perforate screen means, said outlet means extending away from said grinding chamber in a direction generally opposite to the direction of rotation of the outer ends of said blades adjacent said perforate screen means whereby the material being ground within said grinding chamber must undergo a change in direction of flow upon leaving said chamber and entering said outlet means, and baffle means projecting downwardly from said upper wall into said chamber and extending around the portion of said inlet opening aligned radially of said axis with said perforate screen means to block direct radial movement of material from said inlet opening to said screen means.
Claim 3
Dependent Claim
95 words
In a size reduction mill and collector apparatus as described in claim 1 in which the acute angle formed between the longitudinal axis of the outlet means and the line disposed tangent to the surface of the perforate screen means is equal to approximately 60* or less whereby the material ground in said grinding chamber must undergo a change of direction of at least approximately 120*, taken with respect to the direction of the flow of said material within said grinding chamber relative to the direction of flow of the material in said outlet means.
Claim 4
Dependent Claim
69 words
In a size reduction mill and collector apparatus as described in claim 1 including means for controlling the maximum diameter of approximately 90 percent of the material exiting from said grinding chamber, said means including said perforate screen means having a plurality of openings formed therethrough, the diameter of said openings being approximately three times the maximum diameter of 90 percent of the material exiting from the grinding chamber.
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |