Patents
Patents for E21C 25 - Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (2,629)
06/1992
06/09/1992US5120112 Vane type conveyor for a mining machine drum
05/1992
05/19/1992US5114213 High pressure water assisted mining and tunnelling machine
05/13/1992CN1061070A Method of composity coal mining
05/12/1992US5111801 Apparatus for forming slit in rock and concrete surface
04/1992
04/29/1992EP0482019A1 Method and apparatus for cutting erosive materials using high pressure water means.
04/14/1992US5104260 Method and apparatus for tunnelling
04/14/1992US5103705 Eccentrically arranged radial boring tool apparatus
01/1992
01/22/1992CN1015317B Mining machine
12/1991
12/18/1991CN1015121B Mining machine
12/12/1991CA2024263A1 Wear resistant offset sidebar chain
11/1991
11/14/1991DE4014751A1 Cutter drum for coal cutting machine - has main drum body mounted on rotary arbor with roller bearings
10/1991
10/08/1991US5054858 Selectively phased water supply of a cutter head
07/1991
07/16/1991US5031964 Cutting chain for mining machines
05/1991
05/23/1991DE3938435A1 Drilling appts. for roadway cutting or support in mine - consists of two or more drills ganged together and secured by yoke
05/07/1991US5013091 Method of indirect measurement of cowl position on a longwall shearer
04/1991
04/24/1991EP0321492B1 Chain saw
03/1991
03/20/1991CN1012093B Walking hydraulic impulsive coal cutter
03/06/1991EP0362292B1 Device to cut, drill or similarly machine rock, ore, concrete or similar
02/1991
02/05/1991CA1279865C Percussive tool with high pressure fluid jet
01/1991
01/30/1991CN1048908A Longwall arm combine
01/23/1991CN2069923U Pick for tunnelling machine and coal cutter
01/22/1991WO1991001432A1 Method and apparatus for cutting erosive materials using high pressure water means
01/01/1991US4981129 Chain saw
12/1990
12/19/1990CN1010866B Two-spout hydraulic pulsating giant
12/11/1990CA1277587C High pressure fluid jet apparatus for cutting and removing pavement
11/1990
11/28/1990CN1010601B Hydraulic pulse generator
11/28/1990CN1010600B Double-barrel pulse-generating hydraulic monitor
11/22/1990EP0397858A1 Apparatus for forming slit in base rock and concrete surface
10/1990
10/31/1990EP0394806A1 Method and apparatus for tunnelling
10/24/1990CN2064412U Coal-winning machine with short body and single rotary drum
10/02/1990US4960176 Device for cutting, drilling or similar working of rock, ore, concrete or the like
08/1990
08/21/1990US4950034 Shaft excavation method
08/15/1990CN1009214B Hydraulic pulse generator
07/1990
07/11/1990CN2059182U Accordion type spray nozzle for high pressure efflux
06/1990
06/20/1990CN2058424U Auto-control hydraulic broken cutting tool
06/06/1990CN1008288B Removing apparatus of guiding with protective hydraulic props
05/1990
05/23/1990EP0369606A1 Shaft excavation system
05/23/1990EP0368887A1 Selectively phased water supply of a cutter head.
05/23/1990DE3838862A1 Walzenlader Shearer
05/01/1990US4921309 Mining machine adapted for attachment of continuous miner cutter boom assembly
04/1990
04/11/1990EP0362292A1 Device to cut, drill or similarly machine rock, ore, concrete or similar
03/1990
03/27/1990CA1267178A1 Manipulative device
03/14/1990EP0358112A1 Cutter jib for cutting machines for cutting rock, concrete, etc.
03/07/1990CN2054074U Slitting machine for coal mine
03/06/1990US4906048 Method of downhole hydraulicking of mineral resources
02/1990
02/08/1990DE3826625A1 Shearer drum
12/1989
12/20/1989CN1006162B Hydraulic impulse generator
11/1989
11/28/1989US4883322 Mining and conveying apparatus
11/15/1989CN2047717U High-pressure efflux rockdrill
11/07/1989US4878712 Hydraulic method of mining coal
11/02/1989DE3905737A1 Method of boring galleries, tunnels, caverns and the like - among other things arch profiles - with preferably activated undercutting tools which excavate in a stepped, splitting manner and are fastened to an arm arranged in an articulated and movable manner at the centre point in all directions
10/1989
10/24/1989US4875738 Arm-supported cutting roll with effective length pivotally adjustable along mining face
09/1989
09/07/1989DE3806335A1 Cutter head for winning and advance-working machines, in particular selective-cut heading machines with cross-cutting head
08/1989
08/30/1989EP0329915A1 Shaft for drilling tools, eccentrically arranged and rotatably mounted
08/15/1989US4856719 Cutting arm
07/1989
07/27/1989WO1989006741A1 Apparatus for forming slit in base rock and concrete surface
07/20/1989DE3800426A1 Cutter head for rock or coal extraction
07/13/1989DE3844148A1 Apparatus and method for the preliminary cutting of a heading
07/12/1989CN1033860A Mining machine
07/12/1989CN1033859A Walking hydraulic impulsive coal cutter
07/11/1989US4846631 Gearbox for a rotary, mineral cutting head
06/1989
06/28/1989EP0321492A1 Chain saw.
06/14/1989CN2039349U Rolling and shearing cutter head of coal-minning machine for thin coal bed
06/13/1989US4838615 Apparatus for excavating a recess
06/13/1989US4838614 Method of excavation and apparatus therefor
06/06/1989US4836613 Cutterhead for water jet assisted cutting
05/1989
05/31/1989EP0318285A1 Mining machine
05/03/1989EP0314263A1 Mining method and apparatus
05/02/1989US4826087 Manipulative device
03/1989
03/16/1989DE3731234C1 Hochdruckwasserstrahlgeraet mit pulsierendem Wasserstrahl Hochdruckwasserstrahlgeraet with pulsating water jet
03/16/1989DE3730977C1 Shearer drum for a winning machine in mining and method of manufacturing a shearer drum
03/16/1989DE3724864C1 Hochdruckwasserstrahlgeraet mit pulsierendem Wasserstrahl Hochdruckwasserstrahlgeraet with pulsating water jet
03/15/1989CN1031743A Apparatus for cutting, drilling or similar machining stone. ores or similars
03/09/1989WO1989001837A1 Rotating, radially impacting rollers, balls or similar for excavating/milling of rocks or other materials
03/08/1989EP0306112A1 Process for laying a line in the ground
02/1989
02/23/1989WO1989001396A1 Device to cut, drill or similarly machine rock, ore, concrete or similar
02/15/1989EP0303313A1 Device for the cutting, drilling or similar working of stone, concrete or the like
02/08/1989CN1030960A 采掘机 Mining machine
01/1989
01/12/1989WO1989000236A1 Selectively phased water supply of a cutter head
12/1988
12/22/1988DE3718478A1 Coal-winning unit for a steep dip
11/1988
11/24/1988DE3716272A1 Cutting drum for shearer loaders used in underground mining
10/1988
10/11/1988US4776769 System for removing material with a high velocity jet of working fluid
09/1988
09/28/1988EP0284593A1 Cutting jib
09/08/1988DE3705254A1 Additional roller for a roller loader
08/1988
08/24/1988CN87100827A Two-spout hydraulic pulsating giant
08/24/1988CN87100648A Hydraulic pulse generator
08/16/1988US4763955 Pitch seam mining
08/16/1988CA1240496A1 Mounting system for digger tooth sectors on a trenching wheel or a tunneling drum
08/02/1988US4761039 Cutting head for removing material with a high velocity jet of working liquid
07/1988
07/27/1988CN87100252A Double-barrel pulse-generating hydraulic monitor
07/06/1988CN86108271A Hydraulic pulse generator
07/05/1988US4755004 Rotary rocksaw device
06/1988
06/30/1988DE3643234A1 Cutting head for winning and advance working machines, in particular for selective cut heading machines with cross-cutting head
06/22/1988CN87108318A Mining apparatus
06/01/1988EP0269172A2 Rotary rock and trench-cutting saw
05/1988
05/25/1988EP0268334A2 Rotary rock and trench-cutting saw
05/04/1988CN87106278A Removing apparatus of guiding with protective hydraulic props
05/03/1988CA1236128A1 Hydraulic mining method
04/1988
04/21/1988DE3634290A1 Cutting drum equipped with a rotary transmission leadthrough, in particular for machines in underground mining
04/20/1988CN86106787A Hydraulic impulse generator
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