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Class Information
Number: 405/302
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > Control system
Description: Method or apparatus for supply of motive energy to the prop via a regulating circuit to actuate the prop.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
4722574 Personnel detection and protection systems for use in underground mines Feb. 2, 1988
4708394 Methods of controlling the operation of mineral mining installations Nov. 24, 1987
4693640 Method of controlling hydraulically actuatable arrangement in underground mining Sep. 15, 1987
4692067 Control systems Sep. 8, 1987
4679856 Mine self-advancing roof support and method of relocating a mine winning face equipped with self-advancing roof support Jul. 14, 1987
4676698 Hydraulic valve control apparatus Jun. 30, 1987
4657443 Arrangement for supervising synchronous displacement of the pistons of two cylinder-and-piston units Apr. 14, 1987
4643392 Valves Feb. 17, 1987
4622998 Hydraulic control device Nov. 18, 1986
4613256 Supporting frame Sep. 23, 1986
4613257 Hydraulic control arrangement Sep. 23, 1986
4586424 Hydraulic control arrangement May. 6, 1986
4586851 Levelling ram for roof-shield mine support systems May. 6, 1986
4580594 Valve devices Apr. 8, 1986
4572709 Control apparatus Feb. 25, 1986
4564047 Control valve Jan. 14, 1986
4552488 Mine roof support system Nov. 12, 1985
4534681 Mine roof supports Aug. 13, 1985
4518285 Control system for longwall mining roof supports May. 21, 1985
4474510 Hydraulic mine-roof support Oct. 2, 1984
4473324 Mine roof supports Sep. 25, 1984
4465408 Mine-roof support control mechanism Aug. 14, 1984
4453846 Mine equipment Jun. 12, 1984
4451181 Control systems for mineral mining installations May. 29, 1984
4443135 Control apparatus Apr. 17, 1984
4440522 Hydraulic control arrangement for a roof support unit of a mineral mining installation Apr. 3, 1984
4433945 Method and apparatus for controlling a mine roof support Feb. 28, 1984
4432673 Mine roof support Feb. 21, 1984
4428422 Device provided with retractable arms for the anchoring of an instrument in a cavity Jan. 31, 1984
4427321 Mineral mining installation Jan. 24, 1984
4422808 Hydraulically-operated devices Dec. 27, 1983
4422807 Mine roof supports Dec. 27, 1983
4398851 Arrangement for controlling advancing timbering in underground mining Aug. 16, 1983
4379662 Control device for an advancing support in underground mining Apr. 12, 1983
4378027 Control unit for an electro-hydraulic roof support control arrangement Mar. 29, 1983
4330154 Mining apparatus May. 18, 1982
4327628 Hydraulic roof support control system May. 4, 1982
4325659 Mineral mining installation Apr. 20, 1982
4264237 Method for controlling a hydraulically operated mine roof support and an arrangement for carrying out the method Apr. 28, 1981
4247226 Hydraulic conduit systems for mine installations Jan. 27, 1981
4226558 Control system Oct. 7, 1980
4225271 Hydraulically operated mine roof support and a control arrangement thereof Sep. 30, 1980
4220424 Valve arrangement for a walking mine roof support Sep. 2, 1980
4191498 Hydraulic roof support control system Mar. 4, 1980
4182585 Double-plate control device Jan. 8, 1980
4159671 Self-advancing mine roof supports Jul. 3, 1979
4158326 Control device Jun. 19, 1979
4146271 Control of self-advancing mine roof supports Mar. 27, 1979
4134270 Mine roof support control Jan. 16, 1979
4132079 Apparatus for remotely operating self-advancing supports or the like Jan. 2, 1979

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