| 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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| 01/10/2001 | CN1279340A Shield supports for having influence on edge of roof caving |
| 12/14/2000 | DE19925738A1 Steuergerät für elektrohydraulische Ausbausteuerungen Controller for electro-hydraulic system controllers |
| 12/14/2000 | DE19925732A1 Fastening structure for holding a control device for electrohydraulic walling control has a supporting part as a fastening element protruding from a control device with guide slots and gliding pegs edging the guide slots. |
| 12/14/2000 | DE19925721A1 Verfahren und Einrichtung zur ferngesteuerten Betätigung eines Steuergeräts Method and apparatus for remote actuation of a control device |
| 12/13/2000 | CN1276465A Control apparatus for controlling electrohydraulic mining machine |
| 12/13/2000 | CN1276464A Method and device for remote-controlled operation of control apparatus |
| 11/22/2000 | CN1274042A Program control system for quickly and hydraulically moving roof supporter |
| 10/19/2000 | DE10018597A1 Control of coal face supports such as hydraulic props uses a hand-held radio controller linked to control elements on the face supports so that their functioning and condition can be interrogated and they can be lowered remotely |
| 09/27/2000 | CN1056908C Method for mining coal bed in certain ploughing depth |
| 08/31/2000 | DE19907344A1 Arrangement for ensuring recovery-optimized position of mining coal face conveyor uses sensors fixing movements of selected charges, sending impulses to data converting control apparatus |
| 06/28/2000 | CN2385085Y Double adjustable formwork construction lining trolley |
| 06/22/2000 | WO2000025003A3 Extraction controller for mining - extraction machines |
| 06/21/2000 | DE19857890A1 A method for controlling the hydraulic operation of mining machines in the event of a pressure supply reduction failure has a separate constant hydraulic pressure source. |
| 06/07/2000 | CN2381782Y Gangue conveyor |
| 06/07/2000 | CN1053256C Appts. for underground extraction |
| 05/18/2000 | DE19851349A1 Displacement measuring sensor for e.g. cylinder stroke for mining plant such as dredger, uses measuring chains employing Reed contacts and resistances and cooperating ring magnets |
| 05/17/2000 | CN1052526C Light low-level hydraulic prop for caving coal mining method |
| 05/04/2000 | WO2000025003A2 Extraction controller for mining - extraction machines |
| 05/02/2000 | US6056481 Method and device for monitoring the load on hydraulic powered shield supports for underground mining |
| 04/27/2000 | WO2000023690A1 Control system for longwall face alignment |
| 04/05/2000 | CN2372450Y Multifunctional lining form trolley |
| 02/08/2000 | CA2075619C Apparatus and method for continuous mining |
| 01/12/2000 | CN1240875A Hydraulic drivage support with front cantilever |
| 12/15/1999 | CN2353892Y Steel-bead linkage type case automaic mud fill-up apparatus |
| 11/18/1999 | DE19847901C1 Underground mining data transmission system for communication between machines |
| 11/17/1999 | CN2349350Y Working face end moving roof hydraulic support |
| 11/17/1999 | CN2349349Y Connection mechanism for parallel arranged moving roof hydraulic support |
| 10/07/1999 | DE19814246A1 Coal face shield structure with a take-off opening |
| 10/05/1999 | US5961254 Hydraulic advancing support frame |
| 09/14/1999 | US5950673 Valves |
| 09/01/1999 | CN1227306A Combined hydraulic support |
| 06/09/1999 | CN1043584C Hydraulic support with reversed upright post |
| 05/20/1999 | DE19751010A1 Fixing system for control unit for electro-hydraulic extension controls fixable at unit carrier |
| 05/20/1999 | DE19751007A1 Control unit for electro-hydraulic long-wall face support equipment e.g. for mining machine |
| 05/19/1999 | CN2319570Y Insertion hydraulic prop controlling valve |
| 05/12/1999 | CN2318400Y Hydraulic support telescopic side protection plate |
| 05/06/1999 | WO1999022278A1 Data transmission device for controlling or adjusting an operational process |
| 05/06/1999 | CA2276215A1 Data transmission device for controlling or adjusting an operational process |
| 04/20/1999 | US5895097 Continuously operating mining machine for simultaneous excavation and conveying of coal |
| 04/14/1999 | CN2314097Y Multifunctional portal trolley for tunnel construction |
| 03/04/1999 | DE19737936A1 Underground-mining machine |
| 02/25/1999 | DE19736663A1 Mine shaft wall retaining shield erection apparatus |
| 02/25/1999 | DE19736662A1 Coal face cutter |
| 01/21/1999 | DE19747054C1 Communication system for configuring control of an extracting process in underground mining |
| 01/20/1999 | CN2304752Y Multifunctional performing machine for tunnel |
| 01/14/1999 | DE19824054A1 Walking lining mechanism for junction between mine face and tunnel |
| 01/14/1999 | DE19729727A1 Automatic walking tunnelling wall shield |
| 12/24/1998 | DE19749052C1 Indexing method for mining conveyor |
| 11/04/1998 | CN1197882A 转向式液压支架 Hydraulic steering bracket |
| 10/01/1998 | DE19731195C1 Link connection for hydraulic shield mine working frame |
| 10/01/1998 | DE19712310A1 Lemniscate thick-seam shield of skid and roofbar |
| 09/30/1998 | CN1194329A Shield support for thick coal layer |
| 09/16/1998 | CN1193070A Lift-moving type hydraulic support and moving manner for same |
| 09/10/1998 | DE19708741A1 Pressure controlled three-two valve |
| 06/23/1998 | US5769504 Equipment for shortwall mining useful for extraction of pillars in underground coal mines |
| 06/10/1998 | DE19717995C1 Hydraulic advance support frame for longwall with prop-free face |
| 06/10/1998 | DE19717994C1 Hydraulic advance support frame for longwall with prop-free face |
| 06/03/1998 | CN1038608C Apparatus for controlling movable hydraulic supports |
| 04/28/1998 | US5743679 Hydraulic shield support frame |
| 04/22/1998 | CN1179811A Method of winning coal, particularly from thick coal-seams |
| 03/04/1998 | CN1174926A Hydraulic walking type support |
| 02/26/1998 | DE19712413C1 Hydraulic consolidation frame for coal face work |
| 02/26/1998 | DE19704906C1 Hydraulic advance consolidation frame used in mining |
| 11/11/1997 | US5685669 Mining roof support |
| 11/06/1997 | DE19616931A1 Continuous working extraction machine |
| 09/17/1997 | EP0795680A1 Shortwall mining equipment for extraction of pillars in underground coal mines |
| 08/21/1997 | DE19621441C1 Locking-device for screwed ring of ram in mine-walling mechanism |
| 08/20/1997 | CN1157367A Light low-level hydraulic prop for caving coal-mining method |
| 07/24/1997 | DE19633847C1 Hydraulically-operated walking walling-frame |
| 05/28/1997 | CN1035025C Necessary support frame before heading face |
| 05/15/1997 | DE19541707A1 Method to breakdown coal seam by milling extracted means of defined coal plane |
| 05/14/1997 | CN1149664A Hydraulic shield support |
| 05/06/1997 | US5626441 Sliding stabilizer |
| 04/09/1997 | CN2251620Y Push-and-pull device for support with inflatable device |
| 12/17/1996 | US5584611 Movable load support |
| 11/28/1996 | DE19528378C1 Hydraulic shield extension frame for long-fronted coal face structure |
| 11/13/1996 | CN1135566A Top-support for underground digging |
| 10/23/1996 | CN2238317Y Double conveyer comprehensive production mine roof coal working surface end support |
| 10/22/1996 | US5567018 Continuous mining linear advance system |
| 08/14/1996 | CN1128836A Continuous conveyor system |
| 08/08/1996 | DE19546427A1 Extraction control for mining machine |
| 08/08/1996 | DE19503701A1 Device for operating hydraulic cylinders of shield structure used in mining |
| 08/07/1996 | CN2232485Y Mechanical load anchor rod driller of development machine |
| 07/10/1996 | CN1032268C Simple integrative mining hydraulic support |
| 05/23/1996 | DE19513998C1 Walking walling mechanism supporting mine=gallery roof |
| 05/15/1996 | DE19537448A1 Water nozzle supply installation for mine walling machines |
| 05/08/1996 | CN2226642Y Net type hydraulic step-by-step support |
| 03/28/1996 | WO1996009462A2 Mechanized prop |
| 03/05/1996 | CA2040408C Pressure limiting valve with teflon seal |
| 02/28/1996 | CN2221102Y Synthetic mining prop pressure measuring device |
| 02/22/1996 | WO1996005411A1 Neighbouring control device for underground powered walking support |
| 02/15/1996 | DE4428469A1 Vorrichtung zur Nachbarschaftssteuerung im Schreitausbau unter Tage Device for controlling the neighborhood roof supports underground |
| 01/03/1996 | CN2216591Y Fibre reinforced cement supporting & shielding product for underground engineering |
| 12/21/1995 | DE4430145C1 Coalface powered support ram control system |
| 12/12/1995 | US5474365 Apparatus for mining a seam, in particular of coal |
| 11/29/1995 | CN2213848Y Low-position caving hydraulic support for coal mine |
| 11/16/1995 | DE4416643A1 Coal-extracting machinery control system |
| 11/16/1995 | DE19515124A1 Hydraulic control unit for face support with series of main valves |
| 11/09/1995 | DE4416005A1 Step frame machine for mining seam of coal |
| 11/08/1995 | CN2212079Y Tail beam of hydranlic advancing rack |