US4278293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for advancing a low-height drift through a subterranean structure
Assignee: PAURAT A LIMITED-LIABILITY Co OF FED REP OF GERMANY GmbH
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Filing: 1979-11-02
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Granted: 1981-07-14
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Expires: 1999-11-02
Abstract
Abstract An apparatus for cutting a flat elongated channel, chamber or passage in subterranean strata, e.g. a crosscut between two mine galleries or shafts, which comprises upper and lower shoes or shields which can be spread apart by a fluid-cylinder system and to which a frame is connected by further fluid cylinders, this frame carrying an excavating worm whose flights are formed with picks for removing the face of the channel to be advanced. A conveyor extends past the frame or through the latter to carry rearwardly the detritus excavated by the worm.
Inventors
- 👤 Friedrich-Wilhelm Paurat
- 👤 Roland Paurat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:00
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/10; E21D9/1093
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
243 words
An apparatus for advancing a cross-cut having a roof and a floor in a subterranean structure and for excavating material from said structure with the advance of the cross-cut, said apparatus comprising: bracing means including a plurality of bracing units spaced apart transversely of the direction in which the cross-cut is to be advanced, each of said bracing units comprising a floor-engaging shield, a roof-engaging shield and fluid pressure means for bracing said shields against said floor and said roof, respectively; cutter means adapted to be shifted in a direction of advance relative to said bracing means and including: an elongated support frame parallel to said shields and connected to each of said bracing units by a respective fluid-pressure cylinder arrangement, said frame being inclined to said direction of advance, at least one cutter worm journaled on said support frame and inclined to said direction of advance, said cutter worm being formed with a generally helical formation provided with picks engaging said structure for removing said material therefrom, means for rotating said worm about a generally horizontal worm axis and inclined to said direction of advance, and a plurality of arms swingable on said support frame about horizontal axes parallel to said worm axis and rotatably carrying said worm; and a material-removal conveyor extending into said cut past said bracing means to the region of said cutter conveyor for leading material away from said cutter conveyor, said material-removal conveyor resting upon said floor.
Claim 2
Independent Claim
243 words
An apparatus for advancing a cross-cut having a roof and a floor in a subterranean structure and for excavating material from said structure with the advance of the cross-cut, said apparatus comprising: bracing means including a plurality of bracing units spaced apart transversely of the direction in which the cross-cut is to be advanced, each of said bracing units comprising a floor-engaging shield, a roof-engaging shield and fluid pressure means for bracing said shields against said floor and said roof, respectively; cutter means adapted to be shifted in a direction of advance relative to said bracing means and including: an elongated support frame parallel to said shields and connected to each of said bracing units by a respective fluid-pressure cylinder arrangement, said frame being inclined to said direction of advance, at least one cutter worm journaled on said support frame and inclined to said direction of advance, said cutter worm being formed with a generally helical formation provided with picks engaging said structure for removing said material therefrom, means for rotating said worm about a generally horizontal worm axis and inclined to said direction of advance, and a plurality of arms swingable on said support frame about horizontal axes parallel to said worm axis and rotatably carrying said worm; and a material-removal conveyor extending into said cut past said bracing means to the region of said cutter conveyor for leading material away from said cutter conveyor, said material-removal conveyor resting upon said floor.
Claim 3
Dependent Claim
27 words
The apparatus defined in claim 1 wherein said rotating means includes a motor and a transmission mounted on said support frame and operatively connected to said worm.
Claim 4
Dependent Claim
31 words
The apparatus defined in claim 2 wherein said worm is inclined to the direction of advance thereof and said motor and transmission lie in the shadow of advance of the worm.
Claim 5
Dependent Claim
20 words
The apparatus defined in claim 1 or claim 4 wherein said support frame is a platform riding on said floor.
Claim 6
Dependent Claim
23 words
The apparatus defined in claim 1 wherein said worm comprises a plurality of worm sections inclined to one another and forming a V.
Claim 7
Dependent Claim
16 words
The apparatus defined in claim 5 wherein the V opens in the direction of said advance.
Claim 8
Dependent Claim
21 words
The apparatus defined in claim 1 wherein said worm is provided with pockets for transferring said material to said material-removal conveyor.
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) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |