Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 6 - Drives for drilling with combined rotary and percussive action
Patents for E21B 6 - Drives for drilling with combined rotary and percussive action (930)
09/1990
09/12/1990EP0387218A1 Device in impact machines
09/12/1990EP0387217A1 Device in impact machines
09/05/1990EP0385959A2 Percussion drill
09/02/1990CA2011265A1 Percussion drill
08/1990
08/29/1990EP0384888A1 Drilling device
08/22/1990EP0382852A1 Device for determining the index of productivity and food ration of animals
08/16/1990EP0381921A2 Control valve for a counter-blow tapping-hole drill
07/1990
07/18/1990EP0378045A1 Hydraulic drill hammer
06/1990
06/19/1990US4934465 Arrangement for the axial bearing of a drilling machine
06/13/1990EP0372089A1 Method and device for determining the quantity of milk extracted from one cow
05/1990
05/30/1990CN1008194B Arrangement for supporting of shank of drilling machine
04/1990
04/25/1990CN1007746B Body construction for drilling machine
04/25/1990CN1007745B Arrangement for mounting of rotation element in drilling machine
03/1990
03/21/1990EP0358786A1 Superimposing drilling device
02/1990
02/08/1990WO1990001102A1 Drilling device and method for the study and exploitation of the underground
01/1990
01/31/1990EP0353168A1 Method and drilling machine for examination and exploitation of the subsoil
01/03/1990CN1006318B Arrangement for supporting of axial bearing of drilling machine
11/1989
11/16/1989WO1989011022A1 Hydraulic drilling machine
11/16/1989WO1989010688A1 Method and device for determining the quantity of milk extracted from one cow
11/16/1989WO1989010687A1 Device for determining the index of productivity and food ration of animals
11/02/1989WO1989010465A1 Hydraulic drilling machine
09/1989
09/19/1989US4867250 Pneumatic impact imparting tool
08/1989
08/08/1989US4854394 Arrangement for supporting of a shank of a drilling machine
07/1989
07/11/1989US4846289 Arrangement for supporting of an axial bearing of a drilling machine
07/11/1989US4846288 Hydraulically powered rotary percussive machines
07/05/1989CN2040529U Hydraulic jet impulse rotary driller
06/1989
06/27/1989US4842080 Arrangement for mounting of a rotation element in a drilling machine
06/27/1989US4842079 Body construction for a drilling machine
06/20/1989US4840238 Superposed drilling device
05/1989
05/24/1989EP0174972B1 Hammer for use in a bore hole and apparatus for use therewith
04/1989
04/04/1989US4817736 Pheumatic impact imparting tool
01/1989
01/25/1989EP0300080A1 Device for drilling through cappings
09/1988
09/15/1988DE3728269C1 Overburden drilling device
08/1988
08/09/1988CA1240310A1 Apparatus and method for driving casing and conductor pipe
06/1988
06/14/1988CA1238035A1 Hammer for use in a bore hole and apparatus for use therewith
04/1988
04/12/1988US4736806 Continuously revolving percussion drilling machine
01/1988
01/07/1988DE3621182A1 Powered hand tool, in particular hammer and/or percussion drill
12/1987
12/16/1987CN87104315A Arrangement for supporting of shank of drilling machine
11/1987
11/25/1987CN87103381A Arrangement for mounting of rotation element in drilling machine
11/25/1987CN87103380A Body construction for drilling machine
11/25/1987CN87103327A Arrangement for supporting of axial bearing of drilling machine
11/10/1987US4705118 Hammer for use in a bore hole and apparatus for use therewith
10/1987
10/28/1987EP0243194A2 Hydraulically powered rotary percussive machines
10/27/1987US4702325 Apparatus and method for driving casing or conductor pipe
10/13/1987US4699223 Method and device for percussion earth drilling
10/03/1987CN86203558U Collision-proof device for the crown block of a compound drill rig
09/1987
09/22/1987CA1227093A1 Continuously revolving percussion drilling machine
08/1987
08/05/1987EP0230417A1 A rock drill
07/1987
07/21/1987US4681170 Rock drills for drilling continuously arrayed bores
06/1987
06/09/1987US4671367 Pole hole digger with percussive core drilling
03/1987
03/10/1987US4648467 Pressure fluid operated percussion drilling machine provided with a rotation mechanism
08/1986
08/13/1986EP0190669A2 Drilling apparatus
08/06/1986EP0189764A2 Apparatus for percussion drilling long holes
06/1986
06/10/1986US4593768 Hydraulically operated impact device
05/1986
05/21/1986EP0181326A1 Improvement to hole bottom hammers for ground drilling
05/10/1986CN85108013A Apparatus and method for driving casing or conductor pipe
05/09/1986WO1986002694A1 A rock drill
05/06/1986CA1204004A1 Tool, particularly a boring tool
04/1986
04/15/1986US4582145 Pressure-medium driven percussion device
03/1986
03/26/1986EP0174972A1 Hammer for use in a bore hole and apparatus for use therewith.
03/18/1986US4576240 Hydraulic impact device
01/1986
01/15/1986EP0168382A1 Device for percussive and/or rotary drilling
12/1985
12/10/1985US4557338 Tool, particularly a boring tool
12/10/1985CA1197836A1 Pressure-medium driven percussion device
11/1985
11/21/1985WO1985005145A1 Improvement to hole bottom hammers for ground drilling
11/05/1985US4550785 Hydraulic drive for actuating a tool
10/1985
10/02/1985EP0156609A1 Hammer for use in a bore hole and apparatus for use therewith
09/1985
09/26/1985WO1985004212A1 Hammer for use in a bore hole and apparatus for use therewith
05/1985
05/14/1985US4516467 Method and apparatus for controlling a rotary percussive hydraulic drill
01/1985
01/22/1985US4494614 Hydraulically operated impact device
11/1984
11/27/1984CA1178513A1 Hydraulically operated impact device
05/1984
05/15/1984CA1167332A1 Pneumatic motor for rock drills and the like
02/1984
02/14/1984US4430926 Hydraulic rotary-percussive machines
02/07/1984US4429752 Pneumatic motor for rock drills and the like
10/1983
10/25/1983CA1155832A1 Reversing mechanism for the direction of rotation in a drilling apparatus
08/1983
08/23/1983US4399876 Reversing mechanism for the direction of rotation in a drilling apparatus
01/1983
01/25/1983US4369848 Control system for a rock drill
01/04/1983US4366869 Hammer drill
11/1982
11/16/1982US4359109 Impactor drill tool
10/1982
10/26/1982US4355691 Hydraulic drilling apparatus
08/1982
08/25/1982EP0058650A1 An hydraulically operated impact device
08/24/1982CA1130171A1 Hydraulic drilling apparatus
07/1982
07/27/1982US4341271 Rock drilling method
07/20/1982US4340121 Pneumatic rock drills
07/20/1982US4340120 Annular casing hammer
03/1982
03/24/1982EP0047944A1 Percussion tool
03/16/1982US4319646 Rotary tool drive system for a jack hammer
11/1981
11/03/1981CA1111738A1 Control system for a rock drill
10/1981
10/27/1981US4296821 Drilling rig and conversion apparatus
10/06/1981CA1110225A1 Rotating drill tool with impact device
09/1981
09/29/1981US4291771 Rotary percussion hydraulic drilling machine
09/22/1981CA1109363A1 Hydraulic powered rock drill
09/15/1981US4289209 Impact device with fluid tool rotation motor
08/1981
08/11/1981US4282937 Hammer
06/1981
06/30/1981US4275794 Tool equipped with a percussive device
04/1981
04/21/1981CA1099613A1 Drilling machine, especially a rock drill
03/1981
03/10/1981CA1097331A1 Percussive drilling tool
03/10/1981CA1097330A1 Method and apparatus for driving pipe
11/1980
11/11/1980US4232752 Method and apparatus for driving pipe
11/11/1980US4232749 Convertible rotary/percussion drill
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