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Class Information
Number: 405/294
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > With canopy extension > Telescoping
Description: Method or apparatus wherein the extension is projected outwardly in a plane parallel to the roof contacting surface of the section.










Patents under this class:

Patent Number Title Of Patent Date Issued
8430604 Shield support assembly for underground mining and supporting surface element therefor Apr. 30, 2013
8371658 Apparatus and method for supporting a mine rib Feb. 12, 2013
8297888 Hydraulic prop comprising thin-walled exterior and interior pipes Oct. 30, 2012
8052352 Mine support having a linearly moveable and/or pivoting end plate Nov. 8, 2011
7883298 Supporting device for an advance working or mining machine Feb. 8, 2011
7717649 Suspending hydraulic pillar May. 18, 2010
6612782 Telescoping tube and method for supporting surrounding walls of a shaft Sep. 2, 2003
6056481 Method and device for monitoring the load on hydraulic powered shield supports for underground mining May. 2, 2000
5626441 Sliding stabilizer May. 6, 1997
5000622 Shaking control unit for a hydraulic cylinder Mar. 19, 1991
4900091 Electrohydraulic coal-mining system Feb. 13, 1990
4798417 Method of separating the upper coal in seams Jan. 17, 1989
4755084 Multi-part roof-contacting structures of mine roof supports Jul. 5, 1988
4718793 Generator for dynamic loading of a mine lining Jan. 12, 1988
4693640 Method of controlling hydraulically actuatable arrangement in underground mining Sep. 15, 1987
4657443 Arrangement for supervising synchronous displacement of the pistons of two cylinder-and-piston units Apr. 14, 1987
4548527 Roof support suitable for use in mines Oct. 22, 1985
4534681 Mine roof supports Aug. 13, 1985
4492495 Roof support for use in mines Jan. 8, 1985
4491441 Self-advancing support and control means therefor Jan. 1, 1985
4427321 Mineral mining installation Jan. 24, 1984
4411558 Roof support suitable for use in mines Oct. 25, 1983
4310268 Mining equipment Jan. 12, 1982
4309131 Mine roof support Jan. 5, 1982
4309130 Mine roof support Jan. 5, 1982
4307981 Mineral mining installation Dec. 29, 1981
4306822 Hydraulic control means Dec. 22, 1981
4269546 Mine working apparatus May. 26, 1981
4122682 Methods of and apparatus for applying roof mats to mine workings Oct. 31, 1978
4119346 Longwall mining system Oct. 10, 1978
3964265 Method and apparatus for mining and supporting the mine roof Jun. 22, 1976











 
 
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