| 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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| 08/25/1988 | DE3804472A1 Strebausbaugestell Mine roof support |
| 08/17/1988 | EP0278172A1 Anchoring |
| 08/10/1988 | CN87107135A Coal mining method with hanging mesh and side pressure supporting frame |
| 08/03/1988 | CN87201589U Portable hydraulic network connector |
| 07/27/1988 | CN88100427A Guarantee valve for pressurized support movement |
| 07/21/1988 | DE3700692A1 Shield-type powered support assembly, in particular for the electrohydraulically controlled face support |
| 07/19/1988 | US4757835 Change-over valve for hydraulic walking mine-roof supports |
| 07/07/1988 | DE3703175A1 Shield-type support |
| 07/05/1988 | US4755084 Multi-part roof-contacting structures of mine roof supports |
| 07/05/1988 | US4755083 For a mine support frame |
| 06/30/1988 | DE3643671A1 Resetting valve |
| 06/09/1988 | DE3641245A1 Cylinder bearing arrangement for the setting cylinder of a cantilever bar |
| 06/07/1988 | US4749311 Foot element and cooperable strut element for use in a roof support mechanism |
| 06/01/1988 | DE3739395A1 Grubendachstuetzen Grubendachstuetzen |
| 06/01/1988 | DE3739221A1 Strebausbau Longwall |
| 05/31/1988 | US4747730 Trestle being displaceable on caterpillar |
| 05/31/1988 | US4747729 For supporting the roof in underground cavities |
| 05/26/1988 | DE3640008A1 Articulated connection between canopy and hydraulic prop of a powered support assembly, in particular a shield-type powered support assembly |
| 05/26/1988 | DE3640006A1 Control unit for hydraulic support-control systems |
| 05/26/1988 | DE3639996A1 Device for the auxiliary ventilation of underground winning operations, in particular of shortwall faces with only one gate road |
| 05/26/1988 | DE3638997A1 Valve for controlling a hydraulic cylinder, in particular in shield-type support in mining |
| 05/19/1988 | DE3734642A1 Grubendachabstuetzungen Grubendachabstuetzungen |
| 05/19/1988 | DE3638695A1 Mobile powered support assembly |
| 05/18/1988 | CN87204554U Hydraulic support with retractable top beam |
| 05/11/1988 | DE3637349A1 Hydraulic control unit, in particular for adjacent control in self-advancing support underground |
| 05/04/1988 | CN87106278A Removing apparatus of guiding with protective hydraulic props |
| 05/04/1988 | CN87106195A Protective structure for setting adjusting jacks of roof-supporting beams |
| 04/28/1988 | DE3606094A1 Powered support assembly with setting/sliding bar |
| 04/14/1988 | DE3732066A1 Self-advancing support arrangement with light-alloy props for supporting various mine spaces |
| 04/12/1988 | US4737052 Distributor |
| 04/12/1988 | US4737051 Mobile mine-roof support |
| 04/07/1988 | DE3627205C1 Hydraulic self-advancing support assembly in combination with a winning apparatus circulating at the roof and floor |
| 03/24/1988 | DE3631266A1 Winning apparatus guided on hydraulic self-advancing support assemblies |
| 03/22/1988 | US4732511 Mine roof supports |
| 03/17/1988 | DE3709786C1 Hydraulic shield support assembly for pneumatic stowing operations |
| 03/10/1988 | DE3630449A1 Connection unit which can be connected to the pans of a scraper chain conveyor and has a walking-mechanism and control-cylinder connection |
| 03/10/1988 | DE3629321A1 Monitoring and maintenance apparatus for equipment used in an underground face cavity |
| 03/03/1988 | DE3641544C1 Method and apparatus for withdrawing the shields from a face in coal mines |
| 03/02/1988 | EP0257652A1 Method of and device for driving a coal winning gallery partly in the footwall of a seam |
| 03/02/1988 | CN87208239U Blanketing and coupling lozenge metal gauze device in slicing comprehensive mining machinery |
| 02/24/1988 | CN86205744U Frame-moving machine |
| 02/11/1988 | DE3626947A1 Hydraulic supply arrangement for underground winning operations |
| 02/09/1988 | CA1232464A1 Mine roof support unit |
| 02/04/1988 | DE3624731A1 Travelling headway-support structure |
| 02/02/1988 | US4722574 Personnel detection and protection systems for use in underground mines |
| 01/20/1988 | CN86105017B Mine support with conveyer |
| 01/12/1988 | US4718793 Generator for dynamic loading of a mine lining |
| 01/07/1988 | EP0250606A1 Method and apparatus for the posterior mounting of construction elements on an extended floor in the soil at drift mining operations |
| 01/07/1988 | DE3629934C1 Gap seal for a shield support assembly |
| 01/06/1988 | CN87206850U Spring propping board |
| 12/30/1987 | CN87206913U Sliding hydraulic chock for cap of coal mine |
| 12/30/1987 | CN87104493A Supports for slope supporting in tunnel |
| 12/23/1987 | EP0250286A1 Underground mining process using downwardly directed stoping and caving, and installation for carrying this out |
| 12/17/1987 | DE3620242A1 Pilot valve, in particular 3/2 way valve |
| 12/16/1987 | CN86105017A Mechanical move type linkage support |
| 12/03/1987 | DE3618440A1 Excavation frame for use in inclined and semi-inclined stratification |
| 12/03/1987 | DE3618438A1 Extraction system for underground winning operations in inclined stratification |
| 12/03/1987 | DE3618437A1 Extraction frame for use in inclined stratification |
| 12/03/1987 | DE3617956A1 Verfahren und vorrichtung zum nachtraeglichen einbringen einer fluessigkeitsundurchlaessigen schicht in ausgedehnte deponien und kontaminierte standorte zum schutze des grundwassers Method and device for subsequent introduce a liquid-impermeable layer in extensive landfills and contaminated sites to the lee of groundwater |
| 12/01/1987 | US4710064 Movable roof support and bolter system |
| 11/24/1987 | US4708531 Pivot connections for use with mine roof supports |
| 11/11/1987 | CN86205217U Ear wedged connect piece suitable for u-shaped steel support used in mine |
| 11/05/1987 | DE3626950C1 Face support |
| 10/29/1987 | DE3614300A1 Displacement transducer |
| 10/27/1987 | US4702148 Control of the actuation of hydraulic consumers |
| 10/20/1987 | US4701079 Pivot connections for use with mine roof supports |
| 10/14/1987 | CN87103428A Method of backfilling longwall workings and dam for backfilling longwall workings |
| 10/08/1987 | DE3710839A1 Versetzverfahren der strebraeume sowie damm zur versetzung von strebraeumen Versetzverfahren the strebraeume and embankment for dislocation of strebraeumen |
| 09/30/1987 | CN86205745U Mechanically driven linkage support frame |
| 09/22/1987 | US4694730 Prop control valve |
| 09/17/1987 | DE3603216A1 Anti-twist locking means for rotary piston drives in working cylinders |
| 09/16/1987 | CN86204209U Side connecting structure for rhombus metal net |
| 09/15/1987 | US4693640 Method of controlling hydraulically actuatable arrangement in underground mining |
| 09/08/1987 | US4692067 Control systems |
| 09/03/1987 | DE3635665C1 Displacement mechanism for mine roof support air pipes - has housing of displacement ram firmly coupled to hoist ram housing, with both rams guided by cams in support head duct |
| 09/02/1987 | CN87100376A Control apparatus of supports at bottom of wall |
| 08/25/1987 | US4688968 Chock block skidding device designed for the powered supports used in the mines |
| 08/25/1987 | CA1225837A1 Walking street for mine shaft |
| 08/20/1987 | DE3604940A1 Method and apparatus for placing an impervious layer under a landfill site |
| 08/06/1987 | DE3620844C1 Method for automatically moving a support frame |
| 07/22/1987 | CN86200754U Pushing-and-pulling stand sustained alternatively by beam and pole |
| 07/14/1987 | US4679856 Mine self-advancing roof support and method of relocating a mine winning face equipped with self-advancing roof support |
| 06/30/1987 | US4676698 Hydraulic valve control apparatus |
| 06/30/1987 | US4676697 Movable roof support and bolter system |
| 06/19/1987 | DE3544349A1 Hydraulic directional support for self-advancing support assemblies |
| 06/10/1987 | EP0224524A1 Method and device for post-setting a liquid impervious layer in extended dumping grounds and contaminated areas in order to protect ground waters |
| 06/04/1987 | DE3620880C1 Hydraulic self-advancing support frame |
| 06/04/1987 | DE3602423C1 Face support chock |
| 06/03/1987 | EP0224242A1 Hydraulic valve for the mining industry |
| 05/27/1987 | DE3627228C1 Ripping device on the roof bar of a face support assembly |
| 05/27/1987 | DE3613765C1 Setting device for hydraulic self-advancing support |
| 05/21/1987 | DE3528999A1 Device for measuring an advancing unit of the hydraulic support system in underground working |
| 05/14/1987 | DE3539801A1 Powered support assembly, in particular shield-type powered support assembly, with walking mechanism |
| 05/13/1987 | CN85108109A Method and apparatus of netting and net-linking of artificial false roof for mining thick coal seam layer by layer |
| 05/05/1987 | US4662796 Supporting pillar for mines |
| 04/16/1987 | DE3534306A1 Method and arrangement for the strip winning of coal |
| 04/14/1987 | US4657443 Arrangement for supervising synchronous displacement of the pistons of two cylinder-and-piston units |
| 04/09/1987 | DE3603412C1 Hydraulic self-advancing support |
| 04/09/1987 | DE3535009A1 Multiple telescopic prop |
| 03/26/1987 | DE3625826A1 Support unit for an underground face, for mechanised arrangement of the support |