Patent US3722805A successfully refreshed from Google Patents.
US3722805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grate for reduction mill
Assignee: American Pulverizer Co
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Filing: 1971-08-06
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Granted: 1973-03-27
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Expires: 1991-08-06
Abstract
Abstract The grate of a reduction mill comprises a housing, a rotor, and a plurality of individual grate bar panels positioned side-byside and arranged in an arc below the rotor in the housing. Each grate bar has two parallel ribs which extend axially through the housing and interconnecting the ribs are axially spaced connectors which in combination with the ribs form openings contained wholly within the individual grate bar panels. Spacers project outwardly and circumferentially from the ribs, and the spacers are axially offset from the connectors. The spacers of adjacent grate bar panels abut and create more openings in the grate. These other openings are axially offset from the openings contained wholly within the individual grate bar panels. Since the spacers and the connectors, and likewise the two types of openings, are staggered, the grate wears evenly and does not tend to wear a groove-like indentation, as do conventional grates.
Inventors
- 👤 S Strom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:24
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/282; B02C13/284; B02C13/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
In a reduction mill having a housing in which a rotor provided with impact elements revolves, an improved grate mounted in the housing outwardly from the circle described by the impact elements, said grate comprising a plurality of individual grate bar panels, each comprising axially extending parallel ribs, means connecting the ribs and forming a plurality of first apertures between them, and axially spaced spacers projecting outwardly and circumferentially from the ribs, the spacers of adjacent grate bar panels abutting to form a plurality of second apertures along the juxtaposed sides of adjacent grate bar panels, the second apertures being axially offset from the first apertures, whereby the grate will wear evenly.
Claim 2
Dependent Claim
112 words
In a reduction mill having a housing in which a rotor provided with impact elements revolves, an improved grate mounted in the housing outwardly from the circle described by the impact elements, said grate comprising a plurality of individual grate bar panels, each comprising axially extending parallel ribs, means connecting the ribs and forming a plurality of first apertures between them, and axially spaced spacers projecting outwardly and circumferentially from the ribs, the spacers of adjacent grate bar panels abutting to form a plurality of second apertures along the juxtaposed sides of adjacent grate bar panels, the second apertures being axially offset from the first apertures, whereby the grate will wear evenly.
Claim 3
Dependent Claim
38 words
The structure according to claim 1 wherein the means connecting the ribs comprise circumferentially extending connectors extending between the ribs and forming the sides of the first openings; and wherein the connectors are axially offset from the spacers.
Claim 4
Dependent Claim
20 words
The structure according to claim 2 wherein the first openings and second openings are substantially the same size and shape.
Claim 5
Dependent Claim
34 words
The structure according to claim 2 wherein the ribs, spacers, and connectors of each rate bar panel are cast integral with one another, and have the surfaces which are presented toward the rOtor flush.
Claim 6
Dependent Claim
43 words
The structure according to claim 2 wherein each grate bar panel further comprises an arcuate mounting portion at the ends of the ribs, and wherein the mounting portions fit into arcuate channels in the housing, whereby the channels confine the grate bar panels.
Claim 7
Dependent Claim
51 words
The structure according to claim 4 wherein flush surfaces of the ribs, spacers, and connectors form the arcuate upper surface of the grate bar panel; and wherein the radius of curvature for the arcuate upper surface is slightly greater than the radius of the circle described by the revolving impact elements.
Claim 8
Dependent Claim
46 words
The structure according to claim 6 wherein the spacers of each grate bar panel terminate at planar abutment surfaces which are perpendicular to the arcuate upper surface of the grate bar panel; and wherein the planar abutment surfaces on adjacent spacers within the grate facewise abut.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |