| Patents for E21D 23 - Mine roof supports for step-by-step movement, e.g. in combination with provisions for shifting of conveyers, mining machines, or guides therefor (3,544) |
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| 11/08/1995 | CN2212078Y Lowing device for hydraulic rack |
| 10/11/1995 | CN2209721Y Jointing apparatus for hydraulic step-by-step mine roof support |
| 10/03/1995 | US5454669 Yield valve |
| 09/13/1995 | EP0519041B1 Apparatus and method for continuous mining |
| 08/31/1995 | DE4406166A1 Temporary, advancing gallery support frame for mine gallery stair |
| 08/31/1995 | DE4406092A1 Rotary valve |
| 08/30/1995 | CN2206352Y Hydraulic chock with reversal upright column |
| 08/09/1995 | CN2204856Y Pulling and supporting pillars of U-shape support and backtimber |
| 08/02/1995 | CN1106104A Hydraulic support with reversed upright post |
| 07/26/1995 | CN1105734A Necessary support frame before heading face |
| 07/20/1995 | DE4401240A1 Floor skid lifter for hydraulic shield support frame |
| 07/12/1995 | CN1029330C Apparatus and method for continuous mining |
| 06/21/1995 | CN1103926A Apparatus for underground extraction |
| 06/14/1995 | CN2200695Y No empty top side-by-side slip top beam hydraulic support |
| 06/13/1995 | US5423638 Mine roof supports |
| 05/24/1995 | EP0441918B1 Pressure limiting valve with teflon seal |
| 05/24/1995 | DE4339346A1 Vicinity control for underground prop structure |
| 05/11/1995 | CA2135354A1 Device for lifting and alignment of nets in rock reinforcement |
| 04/27/1995 | DE4430337C1 Device for pivoting to the floor skid of a powered support |
| 04/05/1995 | CN2193923Y Prop non-skid device for large slope angle recovery working surface |
| 03/30/1995 | DE4330086C1 Hydraulic shield-type powered support assembly for a hydraulic stowing face |
| 03/28/1995 | US5401123 Control device for mine-roof support |
| 03/09/1995 | DE4329549A1 Machine system for winning minerals deposited as a stratum, especially coal |
| 03/02/1995 | DE4328863A1 Mining apparatus for underground mining |
| 02/15/1995 | CN2189645Y Special hydraulic supporting rack for temporary supporting of digging head |
| 02/09/1995 | DE4326536A1 Hydraulic equipment for face support in mining |
| 02/01/1995 | CN2188654Y Combined alternating bracing hydraulic support |
| 01/19/1995 | DE4323378A1 Control block with pressure-compensated pressure-relief valve and protected return line |
| 12/22/1994 | DE4320207A1 Arrangement for the adjacent control of powered support assemblies in self-advancing support underground |
| 12/22/1994 | DE4320010A1 Arrangement for the adjacent control of powered support assemblies in self-advancing support underground |
| 11/30/1994 | EP0626501A1 An improved equipment useful for winning of ores particularly coal in longwall mining |
| 11/29/1994 | US5368369 Equipment useful for winning ores particularly coal in longwall mining |
| 11/15/1994 | US5364171 Apparatus and method for continuous mining |
| 11/02/1994 | CN2181568Y Mining hydraulic roof supporting and replacing machine for step-by-step movement |
| 09/28/1994 | CN2178279Y Hydraulic support |
| 09/21/1994 | CN2177806Y Device for shifting hydraulic support with pressure |
| 09/21/1994 | CN2177805Y Mating support for use front drifting working face |
| 09/07/1994 | CN1091808A Apparatus for controlling movable hydraulic roof supports |
| 08/24/1994 | CN2175305Y Combination type mine roof support for step-by-step movement |
| 08/17/1994 | CN2174565Y Anti-falling device for support |
| 07/21/1994 | DE4300883A1 Working equipment for coal seams |
| 07/20/1994 | CN2172345Y Coal roof face end support and motion apparatus |
| 07/14/1994 | DE4311887C1 Main controller for hydraulic walking walling frame |
| 07/06/1994 | CN2171006Y Light-duty protective support and its moving device |
| 06/29/1994 | CN2170374Y Hydraulic support for blasting down roof of coal mine |
| 05/25/1994 | CN2166231Y Hydraulic step-by-step type temporary mine roof support |
| 05/11/1994 | CN2164462Y Valve group with pressure moving frame |
| 04/27/1994 | CN2163232Y High steady low position hydraulic prop |
| 03/30/1994 | CN1084610A Hydraulic prop for sliding mine caps |
| 03/02/1994 | CN2157985Y Mine roof supporter |
| 02/17/1994 | DE4243289C1 Control unit for hydraulic walking walling frame - has multiple hoses connected to block containing pilot-controlled selector valves and direct connections between hoses and consumer units |
| 02/02/1994 | CN2154912Y Sectional mobile prop |
| 02/02/1994 | CN2154911Y Hinge 4-rod suspension walking prop |
| 01/26/1994 | CN2154350Y Anti-fall callipers for frame stretch-forward beam |
| 01/12/1994 | CN1080688A Moveable hollow hydraulic lifting frame |
| 01/04/1994 | US5275469 Method of working coal seams to a defined preset depth of cutting during ploughing with a cutter |
| 12/29/1993 | CN2151254Y Dual liquid feeding flexible self moving roof support |
| 12/23/1993 | DE4220333A1 Measuring piston displacement in hydraulic working cylinder - determining flow of hydraulic medium through cylinder from pressure difference measurement across choke |
| 12/07/1993 | US5268683 Method of transmitting data from a drillhead |
| 12/01/1993 | CN2148179Y Tunnel support anticollapsing device |
| 12/01/1993 | CN1022943C Hydraulic end supporting rack |
| 11/17/1993 | CN2146572Y Push-moving front cantilever |
| 11/17/1993 | CN2146568Y Simple hydraulic prop |
| 11/16/1993 | US5261729 Apparatus for continuous mining |
| 11/04/1993 | DE4214690A1 Slot cover for shield support - comprises angled side metal plates for cap and break shield held in place by several spring loaded guide bolts |
| 10/28/1993 | DE4207471C1 Hydraulic step extension frame - has return cylinder arranged in guide frame with two horizontal runners connected by transversal yoke |
| 10/27/1993 | CN1022583C Full section hydraulic support with internal and external beam lift strut |
| 10/21/1993 | DE4219736C1 Mine-gallery cutter with walling and conveyor - has beams at skid sides coupled at face end to cowl by drive generating relative movement |
| 10/14/1993 | DE4211771A1 Valve for supply and return pipes of walking cylinder - comprises casing in which piston operates in cylinder against seating and forced in opposite direction by hydraulic pressure |
| 10/13/1993 | CN1077243A Half-discharge step-by-step hydraulic prop |
| 10/12/1993 | US5252006 Mine roof support |
| 10/11/1993 | CA2070567A1 Yieldable roof support system |
| 09/22/1993 | CN1022196C Method of conveying data in whole mine |
| 09/16/1993 | DE4206424A1 Plant for introducing reinforcing layer under waste deposits - forms grid of drainage channels in floor of excavated layer and has movable support frame operated in area to be filled. |
| 09/01/1993 | CN2141467Y Pacing type ceiling support |
| 08/24/1993 | US5238330 Displaceable mine roof support assemblies |
| 08/12/1993 | DE4209515C1 Walking walling-frame for mine gallery - has walking frame mounting with bridge over piston rod supporting lifting ram for floor skids |
| 08/10/1993 | US5234256 Cutting apparatus for mining operations with automatic control |
| 07/22/1993 | DE4201323A1 Facia framework with pole plate - incorporates adjustable support caps pressed against roof by hydraulic rams with fault shield hinged to rear end of facia |
| 07/21/1993 | CN2138697Y Multiple hole multiple section shield drilling system |
| 07/07/1993 | CN1021517C Electric hydraulic controlling method in stope |
| 07/06/1993 | CA1319954C2 Long range multiple point wireless control and monitoring system |
| 05/19/1993 | CN2133673Y Horsehead |
| 05/12/1993 | CN2132833Y Advancing special tunnel support for stope face |
| 05/12/1993 | CN1071993A Combined end hydraulic support |
| 04/14/1993 | CN1070981A Simple integrative mining hydraulic support |
| 04/08/1993 | DE4142165A1 Alignment control for coal face cutter with servo advancement - has displacement monitors on advancing rams and processor control to correct for non linearity after set number of cuts |
| 04/07/1993 | CN2129344Y Self-advancing circular top structure |
| 03/25/1993 | DE4131299A1 Pivoted joints of shield supporting mine gallery roof - are fitted in multipart bushes with corrosion-resistant coating |
| 03/24/1993 | CN1070246A Shield type driving system for various tunnel shapes and sections |
| 03/18/1993 | DE4130825A1 Advancing mine roof support - has hinge connected roof and floor members with hydraulic cylinders, followed by working face protection unit |
| 03/09/1993 | US5192116 Gantry-type mobile mining machine |
| 03/02/1993 | US5190414 Walking prop for mine tunnels |
| 02/24/1993 | CN1069315A Method of mining coal layer in certain plaoughing and paring depth |
| 01/26/1993 | US5181934 Method for automatically adjusting the cutting drum position of a resource cutting machine |
| 01/26/1993 | US5181451 Control system for longwall face support frames |
| 01/20/1993 | CN1068168A Hydraulic prop of mechanically laying and connecting network |
| 01/12/1993 | US5178494 Roof support for underground excavations such as coal mines |
| 12/30/1992 | CN1067479A Hydraulic props with moving roof beam |
| 12/30/1992 | CN1067478A Shielded hydraulic props for step-by-step movement |