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| Number | Title | Issue Date |
| 7665930 | Hydraulically powered door and systems for operating same in low-temperature environments A hydraulic system has a hydraulic actuator for moving a door leaf of a door installation between open and closed positions thereof. A reservoir has a volume for containing a hydraulic fluid. A fluid circuit provides fluid communication between the hydraulic actuato... | 02/23/2010 |
| 6955594 | Mine door system including an air pressure relief door A mine door of the present invention is adapted for installation in a mine passageway and includes a leaf adapted for swinging between a closed position and an open position. The leaf may be mounted in a frame, and a stopping wall may surround the frame. When closed... | 10/18/2005 |
| 6425820 | Mine door power drive system A mine door system including at least two doors positioned in a mine passageway in spaced relation forming an airlock. The doors include at least one leaf movable between open and closed positions to allow passage into and out of the airlock. A control sy... | 07/30/2002 |
| 6334653 | Conveyor device and method of removing material using the conveyor device To move debris (6), the porosity of which presents certain properties, from a space subjected to the pressure of a compressible substance, such as air, where the pressure is high (pressure chamber, (1)) to a space (3) where the pressure is lower, the inve... | 01/01/2002 |
| 6089791 | Tunnel construction method To construct a tunnel in a formation (11, 15) with zones of high hydraulic pressure (15), a gallery (13) is driven from the stable formation (11) toward the problem formation zone (15). At least one lock zone (19) with pressure-tight gates (23, 23') is co... | 07/18/2000 |
| 5538362 | Shield excavator A shield excavator for constructing a tunnel, a hole, a groove and the like having a polygonal, preferably, square section. The excavator (10) comprises: a cylindrical shield body (12) having a polygonal sectional shape; a cutter assembly (18) disposed at... | 07/23/1996 |
| 5203614 | Tunneling machine having liquid balance low flow slurry system A tunneling machine convertible between a "closed mode" and an "open mode" of operation, having a rotatable cutterhead with muck openings communicating with a pressurizable cutterhead chamber and a pressure maintenance system to stabilize the tunnel workf... | 04/20/1993 |
| 5180252 | Earth pressure system shield process The invention relates to an earth pressure system shield process. First of all, an excavation additive consisting of the mixture of an agent for improving fluidity and viscosity of an excavated soil and a mud improving main agent is added (Ic, P2 | 01/19/1993 |
| 5167474 | Form for making a permanent concrete mine stopping A form for making a permanent mine stopping of pourable and hardenable material such as concrete. The form comprises two sets of elongate extension panels, each set including a plurality of panels which may be erected to extend vertically in side-by-side ... | 12/01/1992 |
| 5106163 | Method and apparatus for inspecting a forward end portion in a tunneling machine A system for inspecting a forward end portion in a tunneling machine including cutter bits and a chamber such as a tunnel boring machine or a shield tunneling machine. The system includes an apparatus for inspecting a forward end portion comprising at lea... | 04/21/1992 |
| 4848963 | Earth pressure shield The earth pressure shield for a tunnel and/or gallery excavator has a front working compartment formed by a separating wall having a digging tool and an annular reinforcing space substantially triangular in cross section positioned directly in front of th... | 07/18/1989 |
| 4846606 | Excavated earth and sand transporting apparatus for use in a shield machine An excavated earth and sand transporting apparatus for use in a shield machine for carrying the earth and sand excavated by a cutter head mounted on the most front part of a shield proper through a screw conveyor followed by a transporting pipe to rearwar... | 07/11/1989 |
| 4844656 | Earth pressure shield The earth pressure shield contains a front working compartment having a digging tool and formed by a separating wall. An annular space is formed in the front working compartment with a top region connected with a regulated pressurized air feed and with a ... | 07/04/1989 |
| 4732427 | Head intake for tunnelling machine Apparatus for tunnelling through soil, in which a cutting head is rotatably mounted on a housing and atmospherically sealed from the housing. A muck ring is located in the housing to collect loose soil through an opening into the chamber of the muck ring ... | 03/22/1988 |
| 4729693 | Tunnel excavator The digging tool of the tunnel excavator is mounted on a shield support and operates in a forward digging chamber. The digging chamber is sealed from a tunnel formed by the excavator by a separating wall of the excavator across a transverse cross section ... | 03/08/1988 |
| 4624605 | Shield tunneling apparatus Method for thrusting a shield for use in tunneling includes the steps of causing a rotary head, provided at the front portion of a shield body, an eccentric motion so that earth, soil or sand covering the front of the shield is pressed away radially of th... | 11/25/1986 |
| 4478535 | Mine stopping with man door and door frame assembly A mine stopping having a man door and door frame assembly in which the mine stopping comprises a plurality of elongate extensible and contractible panels extending vertically in side-by-side relation from the floor to the roof of a passageway in a mine. E... | 10/23/1984 |
| 4456304 | Shield tunneling machine and earth removing apparatus therefor An earth removing apparatus for a shield tunneling machine comprising a tubular casing having an excavated earth inlet at one end and a closable outlet for excavated earth at the other end, and a double-shaft screw conveyor rotatably supported by the casi... | 06/26/1984 |
| 4406498 | Shield tunneling method and machine therefor A method for excavating a tunnel wherein the muck from the tunnel face is admitted into the shield; the muck is pressed by a pressure of a predetermined level higher than an active earth pressure in the face and lower than a passive earth pressure as the ... | 09/27/1983 |
| 4370003 | Temporary gas seal for gas level drift of an in situ oil shale retort A temporary gas seal is provided in a gas level drift of an in situ oil shale retort system which includes a production region having a panel of retorts producing gaseous and liquid products and an adjacent retort preparation region where a panel of in si... | 01/25/1983 |
| 4368924 | Driving shield A driving shield having a shield shell and a transverse wall for defining a work chamber, and a removal arm pivotally journalled on the transverse wall. The removal arm has a removal tool for mining or removing a face wall which also delimits the work cha... | 01/18/1983 |
| 4332508 | Shield for tunneling and mining A shield arrangement used for tunneling and mining in which a work chamber has an open front side located at the work face from which material is to be removed in tunneling and mining operations. Pressure is admitted into the work chamber for supporting t... | 06/01/1982 |
| 4311344 | Shield-type tunneling machine with toggle controlled bit plates in cutter disc In a shield-type tunneling machine, a pair of comb-type bit-plates are pivotally supported on a peripheral wall of each cutter slit provided in a cutter disc. In order to adjust a degree of opening of each slit as well as a cutting angle of the bits with ... | 01/19/1982 |
| 4254994 | Method of an apparatus for gaining access to an underground chamber Method and apparatus for gaining access to an underground chamber is disclosed to utilize a pressurized pipe casing which defines a conduit for introducing compressed air to a drill, which drill is utilized to bore a rescue hole to an area of entrapped mi... | 03/10/1981 |
| 4203626 | Articulated boom-dipper-bucket assembly for a tunnel boring machine The articulated boom-dipper-bucket assembly is utilized in a tunnel boring machine of the type which includes a hollow cylindrical body with a front circular cutting edge and a central axis on which an excavator including the assembly is positioned. The a... | 05/20/1980 |
| 4068486 | Automatic tunnel face hydraulic pressure controlling apparatus in shield type hydraulic tunnel boring system An apparatus for automatically controlling tunnel face hydraulic pressure in a hydraulic chamber defined by a rotary cutter head and bulkhead in a shield type excavator used in hydraulic tunnel boring system including a pipe for feeding a hydraulic materi... | 01/17/1978 |
| 4068484 | Automatic tunnel face hydraulic pressure controlling apparatus in shield type hydraulic tunnel boring system An apparatus for automatically controlling tunnel face hydraulic pressure in a hydraulic chamber defined by a rotary cutter head and bulkhead in a shield type excavator used in hydraulic tunnel boring system including a pipe for feeding a hydraulic materi... | 01/17/1978 |
| 4052859 | Method and apparatus of completing slurry shield tunneling at vertical shaft A method of completing a tunnel excavation with a slurry shield type tunneling machine through a soft ground having a high water content or much gushing water, advancing the machine from the ground into a vertical shaft at, for example, a tunnel terminati... | 10/11/1977 |
| 4037526 | Train tunnel ventilation method and apparatus A train tunnel is ventilated by closing an exit end of the tunnel as a train approaches the entrance end, so that during passage through the tunnel the train acts as a loose piston moving through a long closed cylinder, to cause a rapid airflow rearwardly... | 07/26/1977 |
| 4036024 | Device for closing off a mine gallery especially for use to prevent spreading of underground explosions A device for closing off a mine gallery, especially for use to prevent spreading of underground explosions, in which a bag of flexible substantially airtight material is first inflated with a gas under pressure, for instance air, until the inflated bag en... | 07/19/1977 |
| 4023372 | Means to seal-off portions of underground mines and the like An apparatus for sealably closing off or separating portions of a mine for safety or other reasons including an inflatable member having a size and shape which corresponds substantially to the cross-sectional size and shape of a mine passage, tunnel or th... | 05/17/1977 |
| 3970224 | Spoil removal devices for tunnelling machines For use with a tunnelling shield in which an excavating tool operates within a substantially sealed-off and pressurized region, a spoil-removal device for extracting spoil from the pressurized region comprises a cylindrical chamber which has an inlet port... | 07/20/1976 |
| 3955373 | Tunnelling shields The invention provides a tunnelling shield including a plurality of axially extending rams fixed therein for thrusting against a tunnel lining erected behind or within the rear portion of the shield, a fluid pump, a motor for driving the pump and a fluid ... | 05/11/1976 |
