Patent US3987971A successfully refreshed from Google Patents.
US3987971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock crusher
Assignee: Individual
•
Filing: 1975-04-07
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Granted: 1976-10-26
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Expires: 1995-04-07
Abstract
Abstract An impact type rock crusher having a rotor comprised of a plurality of stirrup type hammers adapted to swing through arcs of approximately 180° between bumper blocks about pivot axes as well as rotating about the main shaft of the rotor. The grate positioned beneath the rotor through which the crushed material exits may be moved uniformly radially with regard to the rotor to an alternate grate position to vary the clearance between the hammers and the top surface of the grate. The overall design of the system reduces the height of the apparatus, and the apparatus may be made portable for movement from one location to another.
Inventors
- 👤 Orlie Bob McClure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:18
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/282; B02C13/02; B02C13/04; B02C13/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
A rock crusher comprising a housing forming a crushing chamber, means to feed rocks into said chamber, and a rotor having a main shaft extending longitudinally within said chamber, said rotor having at least two sets of hammers disposed thereon, pivot means to pivotally mount said hammers about pivot axes spaced from said main shaft and parallel thereto, each of said hammers comprising an outer working surface portion and a pair of inwardly extending arms supported at said pivot means, bumper means to limit the pivotal movement of said hammers, a first set of discs mounted on and rotatable with said main shaft, each disc having a first opposed pair of projections extending between the arms of a respective hammer and being connected thereto by said pivot means, each disc having a second pair of opposed projections, and means connecting said bumper means to said second pairs of projections.
Claim 2
Dependent Claim
149 words
A rock crusher comprising a housing forming a crushing chamber, means to feed rocks into said chamber, and a rotor having a main shaft extending longitudinally within said chamber, said rotor having at least two sets of hammers disposed thereon, pivot means to pivotally mount said hammers about pivot axes spaced from said main shaft and parallel thereto, each of said hammers comprising an outer working surface portion and a pair of inwardly extending arms supported at said pivot means, bumper means to limit the pivotal movement of said hammers, a first set of discs mounted on and rotatable with said main shaft, each disc having a first opposed pair of projections extending between the arms of a respective hammer and being connected thereto by said pivot means, each disc having a second pair of opposed projections, and means connecting said bumper means to said second pairs of projections.
Claim 3
Dependent Claim
37 words
A rock crusher according to claim 1, wherein said connecting means for said bumper means comprise shafts extending parallel to said main shaft through openings provided in said bumper means and in said second pairs of projections.
Claim 4
Dependent Claim
70 words
A rock crusher according to claim 1, further comprising a plurality of spacer discs mounted on said main shaft between the discs of said first set of discs and extending outwardly between adjacent hammers short of the normal position of the working surfaces of said hammers during normal operation, said hammers being pivotal to positions in which said hammers are located primarily inwardly of the outer surface of said discs.
Claim 5
Dependent Claim
29 words
A rock crusher according to claim 3, wherein said spacer discs are substantially circular, said discs being provided with apertures through which said pivot means for said hammers extend.
Claim 6
Dependent Claim
51 words
A rock crusher according to claim 1 wherein the housing has a generally horizontally extending upper inlet section, a crushing chamber feed section, a discharge chamber receiving crushed material passing through a grate, and means including chute means to receive fine materials and to convey said material to said discharge chamber.
Claim 7
Dependent Claim
56 words
A rock crusher according to claim 5, further comprising a chassis supporting said housing, said discharge chamber being within a pair of inwardly sloping walls, the upper ends of said walls extending above at least a substantial portion of said grate, and said walls having lower ends extending downwardly beneath the top surface of said chassis.
Claim 8
Dependent Claim
20 words
A rock crusher according to claim 6, further comprising wheel means connected to said chassis to make said housing portable.
Claim 9
Dependent Claim
37 words
Apparatus according to claim 5, further comprising grate adjustment means to uniformly adjust a gap provided between outer surfaces of said rotor and the adjacent surface of said grate over substantially the entire area of said grate.
References Cited (Backward Citations)
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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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |