| Patents for E21D 15 - Props; Chocks (3,432) |
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| 01/28/2009 | CN201187307Y Pull drive ring frame guard supporting type combined scissors fork telescopic top pushing mechanism |
| 01/28/2009 | CN201187306Y Ring frame guard supporting type combined scissors fork telescopic top pushing mechanism |
| 01/28/2009 | CN201187305Y Upright post supporting device |
| 01/22/2009 | WO2009010863A2 Mine support grout bags and packs |
| 01/22/2009 | CA2688228A1 Underground mine ventilation curtain or barrier |
| 01/22/2009 | CA2687873A1 Mine support grout bags and packs |
| 01/21/2009 | CN201184207Y Main control valve of hydraulic support electrohydraulic control system |
| 01/21/2009 | CN201184206Y Complete valve barrel splash-proof three-purpose valve |
| 01/21/2009 | CN201184205Y Cross jointed shaft for coal mine fully-mechanized mining hydraulic support |
| 01/21/2009 | CN201184204Y Integrative placing support with fire-proof holes |
| 01/21/2009 | CN201184203Y U type mine path support frame |
| 01/21/2009 | CN101349159A Method of single channel railless plastic core-rubber-tire vehicle back withdrawing fully-mechanized mining working face |
| 01/14/2009 | CN201180549Y Upright post protecting equipment for mining hydraulic support |
| 01/14/2009 | CN201180548Y Fast-elevation suspending type single-body hydraulic support |
| 01/14/2009 | CN201180547Y Anti-impact cog timbering |
| 01/14/2009 | CN201180546Y Flange beam stand safety clip |
| 01/14/2009 | CN101344007A Hydraulic system for supplying work medium with different filter fineness to different elements of hydraulic support |
| 01/07/2009 | CN201176878Y Walking type micro-terminal support rack for fully-mechanized mining |
| 12/31/2008 | CN201173127Y Large flow safety valve for hydraulic support hydraulic-oil cylinder |
| 12/31/2008 | CN201173126Y Side road booster valve for hydraulic support telescoping column |
| 12/31/2008 | CN201173125Y Linked bidirectional lock for cover type hydraulic support first and second level protecting boards |
| 12/31/2008 | CN201173124Y Balancing bidirectional lock possessing pressure compensate function for balancing hoisting jack |
| 12/31/2008 | CN201173123Y Light monoblock hydraulic prop |
| 12/31/2008 | CN101333927A High pressure setting system without high-pressure pump and its method for controlling high pressure setting |
| 12/24/2008 | CN201170103Y Internal circulation single hydraulic prop |
| 12/24/2008 | CN201170102Y Inclined-false telescopic support type flexible shield support of high-dipping coal bed |
| 12/24/2008 | CN201168497Y Back washing type high pressure filter station |
| 12/10/2008 | CN100441831C Ladder type mining method using united pillars to support roof and partition stope |
| 12/03/2008 | CN100439653C Piston rod sealing handle |
| 12/03/2008 | CN100439652C Fully-mechanized mining working face smooth trough advancing reinforcement support process and hydraulic support therefor |
| 11/26/2008 | CN201155330Y Monoblock hydraulic prop handgrip |
| 11/26/2008 | CN201155329Y Novel suspending strut rod |
| 11/12/2008 | CN201148875Y Piston postposition sealed type single hydraulic prop |
| 11/12/2008 | CN101302935A Crabbing type end head hydraulic support |
| 11/06/2008 | DE202007015351U1 Schildausbaugestell mit Stempel und Eckzylinder Shield support frame with stamp and Eckzylinder |
| 11/05/2008 | CN201144708Y Base of single hydraulic Prop |
| 11/05/2008 | CN201144707Y Double telescopic suspension type hydraulic prop |
| 11/04/2008 | US7445408 Yieldable prop having a restraint arrangement |
| 10/29/2008 | CN201141306Y Anti-flying cap of monoblock hydraulic prop valve core |
| 10/29/2008 | CN201141305Y 1200 liter flat type, long service life, anti-pollution coal mine hydraulic support safety valve |
| 10/23/2008 | WO2008125082A2 Hydraulic ram comprising thin-walled exterior and interior pipes |
| 10/23/2008 | WO2008124880A1 Method of display of longwall roof support pressure data |
| 10/23/2008 | WO2008087537A3 A support net for underground mine supports |
| 10/23/2008 | DE102007018021A1 Hydraulikstempel mit dünnwandigen Außen- und Innenrohren Hydraulic ram with thin-walled outer and inner tubes |
| 10/22/2008 | CN101289939A Integrated suspension device for retaining a lane for next sublevel |
| 10/21/2008 | US7438506 Jack for carrying and installing mine panels |
| 10/15/2008 | CN201133255Y Hydraulic support upright post cylinder terminal port sealing structure |
| 10/15/2008 | CN201133254Y Single-body hydraulic prop three-purpose valve |
| 10/15/2008 | CN101285391A Vertical column and its inner pressurization hydraulic support setting load hoisting system |
| 10/15/2008 | CN101285390A Suspended type combined hydraulic automatic top beam device |
| 10/08/2008 | CN201129329Y Static pressure balance type electromagnetic direction changing valve |
| 10/08/2008 | CN201129328Y Static pressure balance type change valve |
| 10/08/2008 | CN201129182Y Reinforcement oil cylinder type single hydraulic prop for mining without welding column cap |
| 10/08/2008 | CN201129181Y Suspending type single hydraulic prop |
| 10/08/2008 | CN201129180Y Reinforcement movable column type single hydraulic prop for mining without welding column cap |
| 10/08/2008 | CN101280685A Mine support having a linearly moveable and/or pivoting end plate |
| 10/08/2008 | CN101280391A High-strength tough hydraulic prop seamless steel pipe |
| 10/02/2008 | US20080240868 Mine support having a linearly moveable and/or pivoting end plate |
| 10/01/2008 | CN201125739Y Hydraulic safety valve |
| 10/01/2008 | CN201125738Y Straight-line type hydraulic support for fully-mechanized mining working face quick moving |
| 10/01/2008 | CN201125737Y Suspension moving hydraulic support with front cantilever |
| 10/01/2008 | CN201125736Y Suspension moving hydraulic support with front and rear pull girder |
| 10/01/2008 | CN201125735Y Suspension moving hydraulic support with overturn girder |
| 10/01/2008 | CN201125734Y Anti-rolling apparatus of mine down-hole large inclination angle working face |
| 10/01/2008 | CN101275467A High pressure rising pole control valve and high pressure original supporting system with high-pressure pump |
| 09/24/2008 | CN101270668A Bracket especially for retracement of fully-mechanized mining surface |
| 09/17/2008 | CN201116474Y Stope pedestrian inner well supporting device |
| 09/17/2008 | CN101265807A Hydraulic support for special-shaped laneway support |
| 09/17/2008 | CN101265806A Large obliquity thick coal seam small coal pillar goaf-along lane driving side support device |
| 09/12/2008 | WO2008087538A3 A versatile grout bag type of underground support |
| 09/10/2008 | CN101260805A Fully-mechanized mining method for safely passing bottom board laneway rock pillar |
| 09/03/2008 | CN201110181Y Protective cover for hydraulic support upright post |
| 09/03/2008 | CN201110180Y Universal placing bracket with bottom beam |
| 08/27/2008 | CN201106453Y Monocase prop shoe for mining |
| 08/27/2008 | CN201106452Y Assembled stand |
| 08/20/2008 | CN201103580Y Hydraulic operated reversal valve |
| 08/20/2008 | CN101245708A Magnetic rheologic pilot-operated reversing valve for hydraulic support |
| 08/20/2008 | CN101245707A Yieldable rigidity commutation U shaped steel bracket overlap joint segment connecting method |
| 08/13/2008 | CN101240708A Hydraulic support electrohydraulic control system main control valve |
| 08/06/2008 | CN201095986Y Blasting face suspended and folding type spillplate |
| 08/06/2008 | CN101235833A Pilot-actuated valve and main control valve |
| 07/30/2008 | CN201092862Y Single-body hydraulic supporter exhaust valve |
| 07/24/2008 | WO2008087538A2 A versatile grout bag type of underground support |
| 07/24/2008 | WO2008087537A2 A support net for underground mine supports |
| 07/24/2008 | WO2008087536A1 A grout bag type of underground support |
| 07/24/2008 | CA2675684A1 A versatile grout bag type of underground support |
| 07/24/2008 | CA2675299A1 A grout bag type of underground support |
| 07/23/2008 | CN201090556Y Large flow safety valve |
| 07/23/2008 | CN201090225Y Plunger suspending type single-body hydraulic prop air bleeder |
| 07/23/2008 | CN201090224Y Modified type U-shaped steel collapsible tunnel supporting card cable |
| 07/23/2008 | CN201090223Y U-shaped steel collapsible tunnel supporting groove strip steel card cable |
| 07/23/2008 | CN201090222Y Grooved strip steel for U-shaped steel collapsible tunnel supporting card cable |
| 07/23/2008 | CN201090221Y Mine tunnel monomer supporting-post fixing equipment |
| 07/23/2008 | CN201090220Y Twin-jar bi-expansion monoblock hydraulic prop |
| 07/23/2008 | CN201090219Y I-shaped concrete support component for mining |
| 07/16/2008 | CN101220748A Apparatus for positioning mine prop by increasing pressure |
| 07/16/2008 | CN101220747A Rim supporting type combined scissor telescopic pulling mechanism |
| 07/09/2008 | CN101215971A Draft driving ring frame support type combined scissor type stretching and jacking device |
| 07/02/2008 | CN201080828Y Large flow liquid-control one-way valve |
| 06/25/2008 | CN201078237Y Single expansion suspending type hydraulic pressure upright post |