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Class Information
Number: 405/293
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > With canopy extension
Description: Method or apparatus wherein the roof supporting section of the prop includes means associated therewith which can be projected outwardly from an edge of the section into a roof supporting orientation.










Sub-classes under this class:

Class Number Class Name Patents
405/294 Telescoping 31


Patents under this class:

Patent Number Title Of Patent Date Issued
7883298 Supporting device for an advance working or mining machine Feb. 8, 2011
5743679 Hydraulic shield support frame Apr. 28, 1998
5626441 Sliding stabilizer May. 6, 1997
5284404 Moving steel form system Feb. 8, 1994
5133626 Mobile stope support apparatus Jul. 28, 1992
4792261 Mine roof supports Dec. 20, 1988
4773795 Roof cap assembly with supporting cylinders for roof support mechanism Sep. 27, 1988
4755084 Multi-part roof-contacting structures of mine roof supports Jul. 5, 1988
4755083 Adjustable cap unit Jul. 5, 1988
4613257 Hydraulic control arrangement Sep. 23, 1986
4609308 Roof support suitable for use in mines Sep. 2, 1986
4573828 Roof support suitable for use in mines Mar. 4, 1986
4548527 Roof support suitable for use in mines Oct. 22, 1985
4512686 Roof support suitable for use in mines Apr. 23, 1985
4492495 Roof support for use in mines Jan. 8, 1985
4491441 Self-advancing support and control means therefor Jan. 1, 1985
4480946 Gob canopy for a mine roof support Nov. 6, 1984
4465408 Mine-roof support control mechanism Aug. 14, 1984
4449860 Mine roof supports May. 22, 1984
4447174 Cap positioning mechanism May. 8, 1984
4440522 Hydraulic control arrangement for a roof support unit of a mineral mining installation Apr. 3, 1984
4347021 Mine roof supports Aug. 31, 1982
4272129 Mineral mining installation Jun. 9, 1981
4266891 Support assemblies for mine workings May. 12, 1981
4266892 Hydraulic roof-support frame May. 12, 1981
4217067 Mine roof support assembly Aug. 12, 1980
4155675 Hydraulic walking roof-support frame May. 22, 1979
4155676 Hydraulic walking roof-support frame May. 22, 1979
4124984 Mine roof supports Nov. 14, 1978
4114387 Mine roof support Sep. 19, 1978
4102140 Self-advancing mine roof supports Jul. 25, 1978
4065929 Mine roof support and method in longwall mining of thick mineral seams Jan. 3, 1978
4050259 Safety shield and temporary roof support Sep. 27, 1977
4041714 Mine roof supports Aug. 16, 1977
4037419 Mine roof support Jul. 26, 1977
4022026 Safety shield attachment May. 10, 1977
4002036 Mine roof supports Jan. 11, 1977
3932998 Mine roof support Jan. 20, 1976











 
 
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