| 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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| 07/05/1990 | DE3923376C1 Self propelling machine for mining coal - comprises platform supported by vertical hydraulic jacks and raking jacks |
| 07/04/1990 | EP0376925A2 Rock anchor element |
| 06/28/1990 | DE3843964A1 Shield-type support assembly |
| 06/27/1990 | CN1043365A Combined oil cylinder for support apparatus in coal mine |
| 06/20/1990 | EP0374130A2 Rock anchoring |
| 06/19/1990 | US4934758 Appartaus for mounting ancillary equipment |
| 06/06/1990 | CN1008288B Removing apparatus of guiding with protective hydraulic props |
| 05/30/1990 | CN1008195B Supports for slope supporting in tunnel |
| 05/23/1990 | DE3838457A1 Electrohydraulic control device with protective keyboard sheet |
| 05/16/1990 | CN1042214A Long range multiple point wireless control and monitoring system |
| 05/10/1990 | DE3935246A1 Valve layout schematic control panel - has hand-held control device selectively coupled to controls for each successive panel section |
| 05/10/1990 | DE3837600A1 Device for securing a link pin in hydraulic support units with link mechanisms, in particular in lemniscate shields |
| 04/26/1990 | DE3835769A1 Roof-bar arrangement for hydraulic support units, in particular for shield-type powered support assemblies, with a slide bar and allocated slide-bar cylinder |
| 04/26/1990 | DE3835757A1 Elektrohydraulisches steuergeraet Electro-hydraulic Control unit |
| 04/26/1990 | DE3835525A1 Powered support assembly, in particular shield-type powered support assembly, with floor-bar lifting device |
| 04/05/1990 | DE3841542A1 Reversing valve which can be used as a resetting valve |
| 04/03/1990 | US4913499 Equipment and method for measuring convergence |
| 03/29/1990 | DE3930331A1 Coal cutting machine control processor - has two programmed stores and cutting program assembled from part functions |
| 03/29/1990 | DE3843801C1 Advancing device for a powered support assembly |
| 03/29/1990 | DE3831320A1 Roof-bar unit for the support of underground spaces |
| 03/14/1990 | CN1040414A Electric-hydraulic controlling method in stope |
| 03/13/1990 | US4907918 Shaking control unit for a hydraulic cylinder |
| 03/06/1990 | US4906143 for a mineral mining installation |
| 03/06/1990 | US4906133 Mining apparatus for utilization in recovering coal |
| 02/15/1990 | DE3826961A1 Roadway conveyor with spill plates, guide rails and shifting device |
| 02/14/1990 | CN1039638A Hydraulic prop for moving suspended top beam |
| 02/13/1990 | US4900091 Electrohydraulic coal-mining system |
| 02/06/1990 | US4899332 Data transmission/reception systems for electro-hydraulic control systems |
| 02/01/1990 | DE3923593A1 Control system for electrohydraulic units - uses valves and sensors in sub-units grouped into control groups each with processor control |
| 02/01/1990 | DE3923592A1 De-centralised control system for modular mining plant - has selective sequential separation of individual control devices from main bus |
| 01/24/1990 | CN1039083A Gallery station for longwall conveyor drive |
| 01/09/1990 | US4892446 Group control means for hydraulic mine-roof supports |
| 12/28/1989 | DE3827403C1 Apparatus for placing temporary support in the rise heading for longwall faces in collieries |
| 12/21/1989 | DE3820529A1 Control unit for adjacent control in hydraulic support control systems |
| 12/21/1989 | DE3819780A1 Walking-mechanism arrangement for a self-advancing support, in particular a chock-type or shield-type support |
| 12/20/1989 | CN1006165B Hydraulic controller in underground |
| 12/19/1989 | US4887935 Method of controlling the movement of a longwall excavation front, especially the face or breast of a coal seam |
| 12/14/1989 | DE3818725A1 Support chock, in particular for use in pneumatic stowing operations |
| 11/29/1989 | CN2048513U Link single pole steel beam moving device |
| 11/29/1989 | CN2048512U Portable tester for machines |
| 11/23/1989 | DE3815495A1 Electronic control for underground shield-type support |
| 11/21/1989 | US4882501 Power supply arrangement for electro-hydraulic control systems in mining and civil engineering |
| 11/09/1989 | DE3914158A1 Roadway station for a conveyor drive |
| 11/09/1989 | DE3814393A1 Chain scraper conveyor having lateral discharge, in particular for use as a conveyor for stowage material in mining operations |
| 11/09/1989 | DE3814197A1 Winning apparatus for underground mining, in particular for potash extraction |
| 11/02/1989 | DE3813195A1 Plough system for underground winning operations |
| 09/14/1989 | DE3806882A1 Directional control valve, in particular for water hydraulics |
| 09/13/1989 | CN1035542A Lining of gallery area at crossing with longwall heading |
| 09/07/1989 | DE3800193A1 Reversing valve which can be used as a resetting valve |
| 08/31/1989 | DE3833842C1 Powered support assembly |
| 08/24/1989 | DE3904012A1 Grubenausbau zur gewaehrleistung der bergsicherheit in grubenraeumen Mine roof to ensure the safety mountain in grubenraeumen |
| 08/24/1989 | DE3833843C1 Support assembly, in particular a powered support assembly |
| 08/24/1989 | DE3803989A1 Circuit arrangement for the hydraulic corner cylinder of a shield-type support assembly |
| 08/24/1989 | DE3801008C1 Hydraulic support assembly for the face seam in collieries |
| 08/15/1989 | US4856940 Lemniscate mining supports |
| 08/03/1989 | DE3900640A1 Support of a roadway area at the intersection with the working space |
| 07/27/1989 | DE3803941C1 Bar shield for the face support in collieries |
| 07/27/1989 | DE3801617A1 Emergency control device for electrohydraulic upgrade controllers |
| 07/27/1989 | DE3801604A1 Swing-in and mobile face-margin supporting unit |
| 07/19/1989 | CN1034037A Powered support unit |
| 07/19/1989 | CN1034036A Powered support unit |
| 06/27/1989 | US4842063 Anchoring method and capsule therefor |
| 06/22/1989 | DE3841407A1 Mechanised support section |
| 06/22/1989 | DE3841061A1 Mechanised support section |
| 06/22/1989 | DE3742184A1 Control system for mining equipment |
| 06/06/1989 | US4836612 Stress control mining method and apparatus |
| 06/01/1989 | DE3816433C1 Resetting control for hydraulic self-advancing support |
| 05/09/1989 | US4828433 Roof supports |
| 03/30/1989 | DE3730512A1 Support chock, in particular for pneumatic stowing operations |
| 03/28/1989 | US4815898 Roof supports |
| 03/16/1989 | DE3729609A1 Powered face support |
| 03/14/1989 | US4812081 Movable consolidating trestle for securing the excavating edge |
| 03/09/1989 | WO1989002026A1 Stress control mining method and apparatus |
| 03/02/1989 | DE3727650A1 Powered support assembly with a device for removing the material to be exploited which crumbles away from the top layer |
| 02/23/1989 | DE3726746A1 Support system for face winning in inclined stratification, in particular with over-tipped working face |
| 01/24/1989 | US4799510 Valve for use in controlling the functions of mine roof supports |
| 01/18/1989 | CN2031036U Half-load step-following type portable hydraulic support frame |
| 01/17/1989 | US4798417 Method of separating the upper coal in seams |
| 01/12/1989 | DE3822618A1 Abstuetzeinrichtung fuer das hangende eines strebes Support means for the overhanging a longwall |
| 01/11/1989 | CN2030654U Hydraulic trestle with sliding mine cap |
| 01/10/1989 | US4797023 Mine roof supports |
| 01/05/1989 | DE3721135A1 Face support for faces with pneumatic stowing |
| 12/20/1988 | US4792261 Mine roof supports |
| 12/07/1988 | EP0293686A1 Method for backfilling underground excavations and device for carrying out such a method |
| 12/01/1988 | DE3716993A1 Multiple-member support for underground operation, in particular a support shield |
| 11/30/1988 | CN88205833U Combination oil cylinder |
| 11/24/1988 | DE3715782A1 Bracing apparatus |
| 11/24/1988 | DE3715781A1 Bracing apparatus |
| 11/24/1988 | DE3715716A1 Mobile support assembly with crawler unit, in particular for breaking edge support |
| 11/15/1988 | US4784532 Mine roof supports |
| 11/09/1988 | CN88201675U Flexible back plate of splice roof beam for coal face |
| 11/08/1988 | US4782736 Pressure-control valve |
| 11/03/1988 | DE3712961A1 Device for dismantling or assembling telescopic power pistons |
| 11/03/1988 | DE3712694A1 Adjacent control for hydraulically operated support assemblies |
| 11/03/1988 | DE3709437A1 Stope support for pneumatic stowing |
| 10/27/1988 | DE3713008A1 Dismantling aid |
| 10/13/1988 | DE3448126C2 Shield-type support assembly for underground mining |
| 10/05/1988 | CN88102149A Lemniscate mining supports |
| 09/27/1988 | US4773795 Roof cap assembly with supporting cylinders for roof support mechanism |
| 09/07/1988 | CN87206969U Soft-jointed collapse-proof and slide-proof device for tangential roof supporters |