US3874735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining machine
Assignee: Lee Norse Co
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Filing: 1973-10-04
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Granted: 1975-04-01
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Expires: 1993-10-04
Abstract
Abstract A continuous mining machine particularly adapted for low overhead coal seams having a relatively small diameter cutterhead of the non-oscillating or fixed head type driven by chains that also cut coal and convey it rearwardly to a gathering head mounted on the front of the machine. The gathering head carries a pair of counter-rotating discs having vanes cooperating with conveyor fences for sweeping and discharging coal to a conventional conveyor mounted on the machine chassis.
Inventors
- 👤 Jr Frank A Delli-Gatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:37
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/12; E21D9/126; E21D9/128; B; B65; B65G; B65G65/00; E21C; E21C27/00; E21C27/20; E21C27/24; B65G2814/00; B65G2814/03; B65G2814/0301; B65G2814/0326; B65G2814/0328; B65G2814/0331; B65G2814/0334
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
260 words
A mining machine comprising a chassis, a boom mounted on said chassis for vertical movement thereto and projecting forwardly of said chassis, rotary cutter head means including shaft means and drum means mounted on said shaft means for rotation therewith, said drum means comprising a central drum and outer drums adjacent opposite ends of said central drum, supporting arm means including a supporting arm projecting between said central drum and each of said outer drums rotatably supporting said shaft means on said boom to mount said cutter head means to said boom, gathering means below said boom for gathering material mined by said cutter head means, said cutter head means including first sprocket means associated with said central drum adjacent each of its ends and second sprocket means associated with said outer drums at their ends adjacent to said central drum, driving chain means generally centrally of said cutter head means for rotatably driving said cutter head means, said driving chain means including a driving chain drivingly connected to each of said first sprocket means and the thereadjacent said second sprocket means, cutter means carried by said driving chains for mining material during the driven movement of said driving chains, said driving chains including upper and lower runs, and driving means connected to said driving chains for longitudinally driving said driving chains, and the driven movement of said driving chains by their said driving means causing said driving chains to be driven in a direction wherein said lower runs of said driving chains rearwardly convey material towards said gathering means.
Claim 2
Dependent Claim
260 words
A mining machine comprising a chassis, a boom mounted on said chassis for vertical movement thereto and projecting forwardly of said chassis, rotary cutter head means including shaft means and drum means mounted on said shaft means for rotation therewith, said drum means comprising a central drum and outer drums adjacent opposite ends of said central drum, supporting arm means including a supporting arm projecting between said central drum and each of said outer drums rotatably supporting said shaft means on said boom to mount said cutter head means to said boom, gathering means below said boom for gathering material mined by said cutter head means, said cutter head means including first sprocket means associated with said central drum adjacent each of its ends and second sprocket means associated with said outer drums at their ends adjacent to said central drum, driving chain means generally centrally of said cutter head means for rotatably driving said cutter head means, said driving chain means including a driving chain drivingly connected to each of said first sprocket means and the thereadjacent said second sprocket means, cutter means carried by said driving chains for mining material during the driven movement of said driving chains, said driving chains including upper and lower runs, and driving means connected to said driving chains for longitudinally driving said driving chains, and the driven movement of said driving chains by their said driving means causing said driving chains to be driven in a direction wherein said lower runs of said driving chains rearwardly convey material towards said gathering means.
Claim 3
Dependent Claim
54 words
A mining machine according to claim 1 wherein said cutter head means further comprises extensible end portions in telescoping relationship with said outer drums, said extensible end portions being movable relative to said outer drums for extending and retracting said cutter head means, and means for causing said movement of said extensible end portions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |