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| Number | Title | Issue Date |
| 7883298 | Supporting device for an advance working or mining machine In a supporting device (2) for an advance working or mining machine (1), including support props (3) and at least one roof bar (4), the roof bar(s) (4), on their sides facing away from the support props (3), include(s) a plu... | 02/08/2011 |
| 7177709 | Controller for underground mining A controller is disclosed for control operations in underground mining, especially for controllers to control support shields. The controller utilizes a central unit with a microprocessor and assigned, programmable memory devices for the storage and processing of so... | 02/13/2007 |
| 6945738 | Method and apparatus for safety protection of temporary roof support Embodiments of the present invention are directed to a method and apparatus for safety protection control of temporary roof support. In one embodiment, a temporary roof support has a load sensing member. In another embodiment, a beam structure of temporary roof supp... | 09/20/2005 |
| 6612782 | Telescoping tube and method for supporting surrounding walls of a shaft A telescoping tube for supporting surrounding walls of a shaft during the rescue of a victim trapped at the bottom of the shaft. The tube has nesting interlocking successive sections, each successive section having a diameter smaller than the preceding se... | 09/02/2003 |
| 6056481 | Method and device for monitoring the load on hydraulic powered shield supports for underground mining According to the invention, monitoring the load on hydraulic powered shield supports in underground use is performed by using the controller (13) serving for extraction control, which is equipped with microelectronics for load monitoring and load control,... | 05/02/2000 |
| 5626441 | Sliding stabilizer A sliding stabilizer is a machine for supporting the roof in the working zone of a mine. A sliding stabilizer operates in tandem with a mining roof support machine. A sliding stabilizer is capable of supporting the mine roof independently of the roof supp... | 05/06/1997 |
| 5000622 | Shaking control unit for a hydraulic cylinder A shaking control unit for a hydraulic cylinder, wherein a first predetermined pressure is admitted to the piston space of the cylinder through a first hydraulic line. A three/two-way valve connects in its zero position a second hydraulic line to a return... | 03/19/1991 |
| 4900091 | Electrohydraulic coal-mining system A mining system comprises a laterally deflectable segmented conveyor extending longitudinally along a longitudinal face from which material is to be cut, a mining machine displaceable longitudinally along the conveyor and engageable with the face to cut m... | 02/13/1990 |
| 4798417 | Method of separating the upper coal in seams A method in underground coal mining for separating the upper coal of the seam from the roof during the advancement of the upper sliding cap of a support frame, wherein the front edge of the cap is forced in a plane of the cap between the upper coal to be ... | 01/17/1989 |
| 4755084 | Multi-part roof-contacting structures of mine roof supports A mine roof support has a slidable extension at the front end of an auxiliary roof cap pivoted for swinging up and down on a main cap. To prevent the extension from being extended when the angle of inclination of the auxiliary cap is too high an insulativ... | 07/05/1988 |
| 4718793 | Generator for dynamic loading of a mine lining A generator for dynamic loading of a mine lining simulates an unstable ground structure, such as a "bump" of the formation roof by an explosion of an explosive. The generator /3/ comprises a cylinder /6/ with a piston /7/, the said piston functioning as a... | 01/12/1988 |
| 4693640 | Method of controlling hydraulically actuatable arrangement in underground mining A method of controlling a plurality of hydraulically-actuated arrangements in underground excavations, comprises the steps of providing an electrical power supply, connecting a plurality of control devices with said power supply and interconnecting the co... | 09/15/1987 |
| 4657443 | Arrangement for supervising synchronous displacement of the pistons of two cylinder-and-piston units An arrangement for supervising and controlling synchronous displacement of respective pistons of two cylinder-and-piston units, especially of an advancement and a roof cap displacement unit of a roof support assembly for use in underground mining, compris... | 04/14/1987 |
| 4548527 | Roof support suitable for use in mines A roof support suitable for use in mines comprises a main roof-supporting structure, a cantilever carried by the structure, an actuator and a link member through the intermediary of which the actuator is connected to one end portion of the cantilever for ... | 10/22/1985 |
| 4534681 | Mine roof supports A mine roof support has a main roof-engaging structure 2 carried by hydraulic props 6 in known manner and an auxiliary roof-engaging structure at the front end of the main roof engaging structure. The auxiliary roof-engaging structure can be swung up and ... | 08/13/1985 |
| 4492495 | Roof support for use in mines A mine roof support includes a roof-engageable beam which comprises a main portion and a further portion which forms an extension of the main portion. The further portion is hinged to the main portion by a pin-less knuckle joint. The further portion inclu... | 01/08/1985 |
| 4491441 | Self-advancing support and control means therefor A self-advancing support, suitable for use in mines, includes a cantilever which is extendible and retractable with respect to a main portion of the support, and a sprag which is so mounted on said cantilever as to be extendible and retractable with respe... | 01/01/1985 |
| 4427321 | Mineral mining installation A longwall mineral mining installation has a conveyor and a plurality of roof support units positioned side-by-side on the goaf side of the conveyor. Each roof support unit has a roof shield having an advanceable shield extension. Each unit has a first hy... | 01/24/1984 |
| 4411558 | Roof support suitable for use in mines A roof support including a roof-engageable member and a cantilever member, one having parallel elongate compartments with a cover member which has a roof-engageable surface and which overlies the compartments, and the other having parallel and rigid elong... | 10/25/1983 |
| 4310268 | Mining equipment This invention relates to a face sprag for mining equipment, to a mine roof beam incorporating such a sprag and to a mine roof support provided with such a beam. The face sprag comprises a sprag plate, a piston and cylinder unit pivotally attached at one ... | 01/12/1982 |
| 4309131 | Mine roof support A mine roof support has a base, a supporting prop extending upwardly from the base, an elongated roof-supporting element having one portion supported by the supporting prop and another portion telescopable relative to the one portion toward a mine face an... | 01/05/1982 |
| 4309130 | Mine roof support A mine roof support has two sole-sliding elements, a bridge element connecting the sole-sliding elements with one another at the mine face ends of the latter, a roof supporting element supported on the sole-sliding elements, props supporting the roof supp... | 01/05/1982 |
| 4307981 | Mineral mining installation A longwall mineral mining installation has a conveyor and a plurality of roof support units positioned side-by-side on the goaf side of the conveyor. Each roof support unit has a roof shield having an advanceable shield extension. Each unit has a first hy... | 12/29/1981 |
| 4306822 | Hydraulic control means Hydraulic control means are provided for controlling an auxiliary shield positioned at one side of the roof shield of a mine roof support unit. The auxiliary shield is moved laterally of its roof shield by means of three hydraulic rams and the roof shield... | 12/22/1981 |
| 4269546 | Mine working apparatus The invention relates to mine working apparatus including a sprag plate 21. The sprag plate 21 is included in a sprag unit 20 that can be reciprocated in the fore-and-aft direction of the canopy and the sprag unit 20 includes a sprag slide 22 and a link s... | 05/26/1981 |
| 4122682 | Methods of and apparatus for applying roof mats to mine workings A method of applying a protective wire mesh mat to the undersurface of the roof of an underground mine working and apparatus for applying such mat wherein a coil of the mat is carried on a supporting spindle and is paid out against the undersurface of the... | 10/31/1978 |
| 4119346 | Longwall mining system This mining system utilizes a row of roof support units in conjunction with a row of conveyor sections and a continuous mining machine which rides on the conveyor sections. Each roof support includes a primary support shield supported on a base by means o... | 10/10/1978 |
| 3964265 | Method and apparatus for mining and supporting the mine roof A portable temporary roof support is arranged to be on a mining machine to a location beneath an unsupported portion of a mine roof. The portable temporary roof support has a plurality of piston cylinder devices that are connected by conduits to a source ... | 06/22/1976 |
