| 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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| 12/24/1992 | DE4142632C1 Walking support for mine tunnel roof - has jacks to support roof cam and breaker shield |
| 12/23/1992 | CN2125705U U shaped back plate |
| 12/10/1992 | WO1992021855A1 Gantry-type mobile mining machine |
| 12/08/1992 | US5168895 Pressure-relief valve with teflon seal |
| 12/03/1992 | DE4117731A1 Method of mining seams to defined preset depth of cutting |
| 12/01/1992 | CA2069843A1 Method of working coal seams to a defined preset depth of cutting during ploughing with a cutter |
| 11/25/1992 | CN2122936U Two-way movable feeding leg |
| 11/17/1992 | US5163738 Apparatus for mining a seam, in particular of coal |
| 10/29/1992 | DE4113875A1 Walking support frame - is used for longwall face working in coal mine, and has roof cap linked to ground skid by system of articulated arms running transversely |
| 10/29/1992 | DE4009884C1 Switching control for shield support frame - has switching value for each corner ram, whose switching piston is engaged by spring |
| 10/28/1992 | CN2120181U Semi-unloading step-by-step hydraulic support |
| 10/01/1992 | WO1992010643A3 Apparatus and method for continuous mining |
| 09/16/1992 | CN2116090U F11-automatic step-by-step bydraulic support |
| 09/10/1992 | DE4204792A1 Hydraulic conveyor anchor mechanism - has anchor cylinder positioned parallel to conveyor |
| 09/10/1992 | DE4106885A1 Mining skid with overhead casing and shield - has steering guide mechanism to adjust location |
| 09/08/1992 | US5145235 Measurement of the alignment of an articulated mine conveyor |
| 08/19/1992 | CN2113345U Step by step shifting supportor |
| 08/11/1992 | US5137336 Process for the automated winning of mineral, such as coal, in a longwall working |
| 08/06/1992 | DE4202246A1 Coal-face slitting machine - provides directional signal sequence from switched electromagnets for equipment before and behind machine to be removed from intended path |
| 07/29/1992 | CN1063140A Apparatus and method for continuous mining |
| 07/28/1992 | US5133626 Mobile stope support apparatus |
| 07/22/1992 | CN2110712U Cap sliding enclosing rock supporting frame |
| 07/07/1992 | CA1304785C Long range multiple point wireless control and monitoring system |
| 06/25/1992 | DE4100795C1 Roof bar assembly with main and set bars - has roof-side joint with joint cut on main bar and cup retainer on set bar |
| 06/16/1992 | US5121971 Method of measuring uncut coal rib thickness in a mine |
| 06/11/1992 | WO1992010643A2 Apparatus and method for continuous mining |
| 06/10/1992 | CN1061829A Full section hydraulic support with internal and external beam lift strut |
| 05/13/1992 | CN1061070A Method of composity coal mining |
| 05/05/1992 | US5110187 Apparatus for the mining of mineral matter, especially coal |
| 05/05/1992 | CA1299882C Lemniscate mining supports |
| 04/14/1992 | US5104267 Roof supports for a mining installation |
| 04/09/1992 | DE4100828C1 Double-acting advancing ram mechanism - is for powered supports in deep mining and includes shear bolt safety device |
| 04/09/1992 | DE4040345C1 Support frame for mining - has cooler with air blower in support frame and canopy with chamber for cooler |
| 03/31/1992 | US5100263 Mine roof support assembly |
| 03/11/1992 | CN1059390A Walking-type hydraulic supporting frame |
| 02/27/1992 | DE4029735C1 Monitoring electrohydraulic mining machine operation - measuring time-related voltage drop across resistor in magnetic coil circuit of solenoid valve |
| 02/26/1992 | CN2097278U Cap moving device with adjustable double arms |
| 02/19/1992 | CN2096644U Moving structure of hydraulic support |
| 02/19/1992 | CN2096643U Side-by-side moving back timber hydraulic support |
| 02/11/1992 | US5087099 Long range multiple point wireless control and monitoring system |
| 01/22/1992 | CN1015318B Powered support unit |
| 01/16/1992 | DE4021398A1 Extractor for underground mine - has rams in groups thrusting against face and reducing coupling free movement |
| 01/09/1992 | DE4021269A1 Automatic monitor for coalface conveyor-belt position - uses metallic-banded optical cable along conveyor to reveal bend positions and angles |
| 01/08/1992 | CN2092601U Hydraulic props with the feature of step-take sustaining and shielding |
| 01/01/1992 | CN1057503A Mobile stope support apparatus |
| 12/17/1991 | US5073067 Mine roof support |
| 12/05/1991 | DE4017259A1 Structure for underground chamber - is used in transition area between gallery and coal face, floor beam, and gallery frame beam |
| 11/13/1991 | CN2088596U Suspended moving roof beam hydraulic support |
| 10/29/1991 | US5062033 Electro-hydraulic control system for a mineral mining installation |
| 10/29/1991 | US5060556 Arrangement for emergency operation of hydraulic appliance in an electro-hydraulically controlled mineral mining installation |
| 09/26/1991 | DE4016929C1 Roof support for mine - has canopy with bar hinged to floor skids by extendable props |
| 08/21/1991 | EP0441918A1 Pressure limiting valve with teflon seal. |
| 08/13/1991 | US5039257 Mine roof supports |
| 07/23/1991 | US5033913 Mine roof support |
| 07/09/1991 | US5029943 Apparatus for transmitting data |
| 07/09/1991 | CA1285850C Control of the actuation of hydraulic consumers |
| 07/03/1991 | CN2080102U Double t-steel beam supporter |
| 06/13/1991 | DE3940980A1 Permanent lining multiple jack system - has coupled roof bars with associated hydraulically operated mechanism to walk forward alternately |
| 06/13/1991 | DE3940249A1 Making safe conveyor and cutting areas in mine - involves box-like staging which can be moved in phase with driving shield |
| 06/05/1991 | CN2078373U Telescopic type coal pit prop with relaxing and proping-up sliding top-beam |
| 06/04/1991 | US5020860 Methods and apparatus for maintaining longwall face alignment |
| 05/21/1991 | US5017051 Electrohydraulic control means for hydraulic self-advancing support units |
| 05/16/1991 | DE4035252A1 Support equipment for mining roadway - has rise and fall floor member and roof cap with associated jacks |
| 05/08/1991 | DE3936939A1 Magnetic valve switching control for electrohydraulic mining plant - uses electronic evaluation of electrical characteristics upon switching in of valves |
| 04/25/1991 | DE3935035A1 Cylinder activating sliding roof bar in mine - is positioned under roof bar and supported by lugs and element at its foot |
| 04/03/1991 | CN2074362U Mine sliding hydraulic prop |
| 03/27/1991 | CN1012192B Protective structure for setting adjusting jacks of roof-supporting beams |
| 03/19/1991 | US5000622 Shaking control unit for a hydraulic cylinder |
| 03/02/1991 | WO1991003621A1 Pressure limiting valve with teflon seal |
| 02/26/1991 | CA1280614C Underground mining and quarrying operation through descending stripping and undercaving, and related installation |
| 02/20/1991 | CN2071706U Monobloc combination type self-moving end support |
| 02/14/1991 | DE3926620A1 Tunnel shield support frame - has box-framed sole unit and walking mechanism with hydraulic ram |
| 02/13/1991 | CN1011605B Hydraulic prop for moving suspended top beam |
| 01/23/1991 | CN1048740A Movable supporting device |
| 01/02/1991 | CN2068584U Whole frame pushing movable chock |
| 01/02/1991 | CN1011056B Guarantee valve for pressurized support movement |
| 12/26/1990 | CN2068150U Body lap jointed type metal backing deals |
| 12/26/1990 | CN2068148U Single-body combined self-moving support |
| 12/25/1990 | US4979780 Mining or underground quarrying method and installation for implementing same |
| 12/19/1990 | CN1010868B Control apparatus of supports at bottom of well |
| 12/18/1990 | US4978248 Advanceable mine roof supports |
| 12/13/1990 | DE3919013A1 Fastening for link pin for hydraulic steering gear - incorporates disc screwed to link pin end with spacer sleeve |
| 12/06/1990 | DE3917528A1 Electrical control of solenoid-actuated hydraulic valves - has stacked construction with control unit located on top of unit |
| 12/06/1990 | DE3917527A1 Control unit for electrohydraulic unit - has sealed connector at rear that provides latched coupling for cables |
| 12/05/1990 | CN2066892U Integral beam step-by-step movement mine roof support |
| 11/14/1990 | EP0397526A2 Mobile stope support apparatus |
| 11/11/1990 | CA2016594A1 Mobile stope support apparatus |
| 11/06/1990 | US4968978 Long range multiple point wireless control and monitoring system |
| 10/23/1990 | US4964675 Method of electro-hydraulic control of longwall mine units |
| 10/04/1990 | DE3931626C1 Striding mine roof support - incorporates multiple control valve and double-sided cylinder and jack |
| 10/03/1990 | CN2063169U Telescopic flexible metal supporter |
| 09/18/1990 | US4957327 Methods of translating a face support |
| 09/13/1990 | DE3907943A1 Shield-type support assembly |
| 09/12/1990 | CN2061975U Hanging beam type metal roof for support |
| 08/22/1990 | EP0383362A2 Method for backfilling underground excavations, in particular in coal mines |
| 08/15/1990 | CN1009215B Lemniscate mining supports |
| 08/09/1990 | DE3931625C1 Underground mine roof support - maintains constant residual pressure during advance |
| 08/07/1990 | US4946316 Method and device for moving a shield-type support trestle |
| 07/26/1990 | DE3902134A1 Synchronous control for advancing and slide-bar cylinders in self-advancing support units |
| 07/10/1990 | US4940363 Mine roof support assembly |