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Class Information
Number: 405/296
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > With rubble shield
Description: Method or apparatus wherein means secured to the prop provide protection from falling debris.










Patents under this class:
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Patent Number Title Of Patent Date Issued
7775748 Shield support Aug. 17, 2010
7476058 Mining roof support frame with base skids lifting device Jan. 13, 2009
7331735 Apparatus, system, and method for supporting a gate entry for underground full extraction mining Feb. 19, 2008
7201541 Prop head bearing Apr. 10, 2007
6523491 Lift boat Feb. 25, 2003
6481933 Powered support frame for large seam thicknesses with controlled gap sealing plates Nov. 19, 2002
5769504 Equipment for shortwall mining useful for extraction of pillars in underground coal mines Jun. 23, 1998
5743679 Hydraulic shield support frame Apr. 28, 1998
5401123 Control device for mine-roof support Mar. 28, 1995
5238330 Displaceable mine roof support assemblies Aug. 24, 1993
5199825 Grid composite for longwall shield recovery in underground coal and trona mines Apr. 6, 1993
5190414 Walking prop for mine tunnels Mar. 2, 1993
5133626 Mobile stope support apparatus Jul. 28, 1992
5104267 Roof supports for a mining installation Apr. 14, 1992
5033913 Mine roof support Jul. 23, 1991
4940363 Mine roof support assembly Jul. 10, 1990
4856940 Lemniscate mining supports Aug. 15, 1989
4828433 Roof supports May. 9, 1989
4815898 Roof supports Mar. 28, 1989
4812081 Movable consolidating trestle for securing the excavating edge Mar. 14, 1989
4797023 Mine roof supports Jan. 10, 1989
4792261 Mine roof supports Dec. 20, 1988
4784532 Mine roof supports Nov. 15, 1988
4747729 Movable trestle May. 31, 1988
4732511 Mine roof supports Mar. 22, 1988
4708531 Pivot connections for use with mine roof supports Nov. 24, 1987
4701079 Pivot connections for use with mine roof supports Oct. 20, 1987
4688968 Chock block skidding device designed for the powered supports used in the mines Aug. 25, 1987
4662796 Supporting pillar for mines May. 5, 1987
4629368 Shield supports suitable for use in mines Dec. 16, 1986
4607986 Shield supports suitable for use in mines Aug. 26, 1986
4557635 Shield-type support frame Dec. 10, 1985
4552487 Mine roof support unit having dust suppression means Nov. 12, 1985
4547098 Mining equipment, mainly for extraction of heavy beds Oct. 15, 1985
4525104 Roof support for tunnel excavator Jun. 25, 1985
4518284 Mine roof supports May. 21, 1985
4511290 Support frame for underground mining operations Apr. 16, 1985
4474510 Hydraulic mine-roof support Oct. 2, 1984
4465406 Mine roof support unit Aug. 14, 1984
4433945 Method and apparatus for controlling a mine roof support Feb. 28, 1984
4422807 Mine roof supports Dec. 27, 1983
4415295 Mineral mining installations Nov. 15, 1983
4406565 Slidable filling dam Sep. 27, 1983
4386878 Mining equipment, mainly for extraction of heavy beds Jun. 7, 1983
4358159 Apparatus for supporting the roof of an underground mine working Nov. 9, 1982
4352602 Roof support for a mine gallery which extends at a relatively large angle inclined to the horizontal Oct. 5, 1982
4313698 Hydraulic shield-type support Feb. 2, 1982
4310268 Mining equipment Jan. 12, 1982
4299517 Mine roof supporting structure Nov. 10, 1981
4293247 Seals for mine roof supports Oct. 6, 1981

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