| Patents for E21D 15 - Props; Chocks (3,432) |
|---|
| 08/30/1994 | US5342150 Collapsible crib mining support column |
| 08/17/1994 | CN2174565Y Anti-falling device for support |
| 08/10/1994 | CN1090622A Movable prop used in mine and gallery |
| 07/07/1994 | WO1994015071A1 Active shoring for mine support in longwall and section |
| 06/29/1994 | CN2170373Y Swinging tail beam type hydraulic support for blasting down roof of coal mine |
| 06/23/1994 | CA2111996A1 Mine support system |
| 06/22/1994 | CN1088290A Control curcuit of plug-in valve for hydraulic props |
| 06/09/1994 | WO1994012423A1 Pressure pad, in particular for filling mining cavities |
| 06/09/1994 | CA2149908A1 Pressure pad |
| 06/08/1994 | CN2168072Y Telescopic prop for increasing support scope |
| 06/07/1994 | US5318388 Improvement in or relating to a shoring leg: a shoring leg with a latch |
| 06/07/1994 | US5318387 Yieldable load support |
| 05/26/1994 | WO1994011612A1 Piston-cylinder unit and process for making it |
| 05/26/1994 | DE4339211A1 Pressurised cushion forming temporary mining support - contains multiple chambers supplied with medium under pressure |
| 05/25/1994 | CN2166229Y Saparating light winch for withdrawing props |
| 05/25/1994 | CN2166228Y Boost pressure detecting instrument for props |
| 05/25/1994 | CN2166227Y Connector for props |
| 05/25/1994 | CN2166226Y Flexible compromise joint for props |
| 05/24/1994 | US5314161 Mine prop |
| 05/04/1994 | CN2163873Y Gas and liquid exhauxsting liquid filler with pressure display |
| 05/04/1994 | CN2163872Y Steel-wood joined prop for ultra-unstable coal beds |
| 05/04/1994 | CN1086287A Supporting, Protecting and Connecting assembly for multi-section shed |
| 05/03/1994 | US5308196 Yieldable confined core mine roof support |
| 04/21/1994 | DE4316390C1 Consolidation support for mine or tunnel - has hollow upper and lower support parts, upper part being pushable into lower part, and floor of upper part being formed as plate |
| 04/20/1994 | CN2162529Y Tool for taking break emulsion mouth special for hydraulic support |
| 04/13/1994 | CN2161728Y Booster-type liquid filling gun |
| 04/13/1994 | CN2161727Y 轻型单体液压支柱 Lightweight hydraulic prop |
| 04/13/1994 | CN2161726Y Hydraulic prop |
| 04/13/1994 | CN1085289A Frame for supporting hydraulic tube |
| 03/30/1994 | CN2160018Y Portable injection gun |
| 03/30/1994 | CN2160017Y Coal mine prop base |
| 03/30/1994 | CN2160016Y Mine life saving portable prop |
| 03/29/1994 | US5297901 Individual hydraulic prop with filling/drawing valve and pressure fluid return |
| 03/16/1994 | CN2158919Y Spring cleaning machine |
| 03/16/1994 | CN2158918Y Spring cleaning machine |
| 03/16/1994 | CN2158917Y Pressure-detecting instrument for positive pressure prop |
| 03/16/1994 | CN1083905A High pressure hydraulic valve |
| 03/09/1994 | CN2158447Y Automatic device for increasing pressure |
| 03/02/1994 | CN2157983Y Simplex hydraulic prop cylinder shrinking apparatus |
| 02/22/1994 | US5288178 Preload headboard for an elongate prop |
| 02/16/1994 | CN2156287Y Single body hydraulic support lifting device |
| 02/03/1994 | WO1994002709A1 Tubular hydraulic prop |
| 02/03/1994 | DE4224852A1 Wasserhydraulische Rohrstütze Water Hydraulic pipe support |
| 02/02/1994 | CN2154909Y Single hydraulic prop piston structure |
| 02/02/1994 | CN2154908Y Plastic bamboo h-beam for tunnel support |
| 01/26/1994 | CN2154349Y High-pressure liquid filling gun for single hydraulic strut |
| 01/19/1994 | CN2153636Y Resistance increasing type wedge for tunnel metal chock |
| 01/12/1994 | CN2152905Y Single-hydraulic prop piston head |
| 01/12/1994 | CN2152904Y I-steel chock fall preventing device for drift mine |
| 01/05/1994 | EP0482141B1 Hydraulic steel pit prop |
| 01/05/1994 | DE4221941A1 Hydraulic pit prop assembly - has outer prop tube with attached prop foot and inner prop tube inside outer longitudinally movable against spring force |
| 01/05/1994 | CN2152076Y Spring pressure display |
| 12/29/1993 | CN2151252Y Automatic pressuring liquid filling gun |
| 12/28/1993 | US5273378 Support column |
| 12/24/1993 | CA2098975A1 Grout composition |
| 12/22/1993 | CN2150334Y Direct-reading type pressure-measuring device |
| 12/01/1993 | CN2148178Y Suction type adjustable automatic emulsion proportioning device |
| 12/01/1993 | CN1079022A Safety prop system |
| 11/24/1993 | CN2147382Y Liquid in and out integral valve plate |
| 11/24/1993 | CN2147349Y Column end connection device |
| 11/24/1993 | CN2147348Y Column end connection device |
| 11/17/1993 | CN2146571Y Moving prop lengthening device of single-body hydraulic prop |
| 11/17/1993 | CN2146570Y Single-body hydraulic prop |
| 11/17/1993 | CN2146569Y Double-connecting-rod type hydraulic prop |
| 11/17/1993 | CN2146568Y Simple hydraulic prop |
| 11/17/1993 | CN2146567Y Ladder-shaped telescopic prop |
| 11/10/1993 | CN2145867Y Leader type 2-way insertion safety valve for hydraulic prop |
| 11/03/1993 | CN2145262Y Pressurize, load-indicating topping-up gun |
| 10/27/1993 | CN2144711Y Dust-proof three-purpose valve |
| 10/27/1993 | CN1022583C Full section hydraulic support with internal and external beam lift strut |
| 10/11/1993 | CA2070567A1 Yieldable roof support system |
| 09/15/1993 | CN2142142Y Multi-function safety apparatus for driving frame |
| 09/15/1993 | CN1076247A Method for enhancing stability of metallic supports in galleries |
| 09/08/1993 | CN2141840Y Semi-unloading single swing stem hydraulic chock |
| 09/08/1993 | CN2141839Y Large nylon base for prop clump |
| 09/01/1993 | CN2141465Y Width supporting type flexible shield support adjustable |
| 08/31/1993 | US5240354 Support element for use in underground mining and tunnel construction |
| 08/25/1993 | EP0472545B1 Flexible telescopic prop for building materials |
| 08/11/1993 | CN2139993Y Anti-falling safety device of single body hydraulic support |
| 08/11/1993 | CN2139992Y Single body hydraulic support |
| 07/21/1993 | CN2138696Y Single prop foot in mine |
| 07/20/1993 | US5228810 Mine support post |
| 07/15/1993 | DE4200682A1 Disposable pit-prop for filling with hardening material - has gear-driven screwed bar thrusting inner and outer tubes apart and actuated from outside |
| 07/14/1993 | CN1074270A Light one-colume hydraulic prop |
| 07/07/1993 | CN2137715Y Net-laying device for hydraulic support |
| 06/30/1993 | CN2137288Y Trapezoid two-way flexible prop |
| 06/30/1993 | CN1073743A Adjustable hydraulic supporting frame |
| 06/23/1993 | CN2136876Y Self-cleaning filter unit |
| 06/23/1993 | CN2136875Y Multi-function pressure indicator |
| 06/23/1993 | CN1021354C Hydraulic steel props for mine |
| 06/16/1993 | CN2136328Y Single four inclined prop pithead frame with quadrature arrangement lifts |
| 06/09/1993 | EP0545023A1 Hydraulic prop with fill/release valve and recirculation of pressure liquid |
| 06/09/1993 | CN2135649Y Manual multi-purpose pressure increaser |
| 06/09/1993 | CN1072991A Bamboo prop for mine |
| 06/01/1993 | US5215411 Yieldable mine post system |
| 05/26/1993 | CN2134487Y Three-purpose valve with inner-insurance, large-flow and long service life |
| 05/26/1993 | CN2134486Y Double t-steel wing clip for mine |
| 05/19/1993 | CN2133671Y Portable hydraulic prop winch |
| 05/19/1993 | CN2133670Y Folding iron shoe |
| 05/19/1993 | CN2133669Y External injection single-valve rising type single hydraulic strut |