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Class Information
Number: 405/295
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > Cantilevered
Description: Method or apparatus wherein a connecting member is pivotally attached at one end to a roof supporting section of the prop and at the other end to the base of the prop and a force is applied to the connecting member to move the roof supporting section to its operative position.










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
5685669 Mining roof support Nov. 11, 1997
5454669 Yield valve Oct. 3, 1995
5238330 Displaceable mine roof support assemblies Aug. 24, 1993
5073067 Mine roof support Dec. 17, 1991
5039257 Mine roof supports Aug. 13, 1991
5033913 Mine roof support Jul. 23, 1991
4828433 Roof supports May. 9, 1989
4815898 Roof supports Mar. 28, 1989
4792261 Mine roof supports Dec. 20, 1988
4773795 Roof cap assembly with supporting cylinders for roof support mechanism Sep. 27, 1988
4749311 Foot element and cooperable strut element for use in a roof support mechanism Jun. 7, 1988
4701079 Pivot connections for use with mine roof supports Oct. 20, 1987
4607986 Shield supports suitable for use in mines Aug. 26, 1986
4586851 Levelling ram for roof-shield mine support systems May. 6, 1986
4563111 Mine roof supports Jan. 7, 1986
4560306 Coal face support Dec. 24, 1985
4552487 Mine roof support unit having dust suppression means Nov. 12, 1985
4480946 Gob canopy for a mine roof support Nov. 6, 1984
4462637 Control apparatus for inclination of longwall guide Jul. 31, 1984
4390308 Advance mechanism for a mine roof support assembly Jun. 28, 1983
4382722 Nine lining structure May. 10, 1983
4352602 Roof support for a mine gallery which extends at a relatively large angle inclined to the horizontal Oct. 5, 1982
4315386 Portal building structures Feb. 16, 1982
4293247 Seals for mine roof supports Oct. 6, 1981
4252477 Mine roof support Feb. 24, 1981
4236850 Shield timbering frame for timbering mines Dec. 2, 1980
4231684 Shield type support for use in underground mining with lemniscate guide rods Nov. 4, 1980
4222686 Mine roof support Sep. 16, 1980
4183701 Coupling gear for lemniscate shield timbering frame Jan. 15, 1980
4136999 Canopy and shield structure for a supporting shield in a seam-like mine deposit Jan. 30, 1979
4085592 Shield tubbing for longwalls Apr. 25, 1978
4077223 Roof support shield structure for use in an excavation Mar. 7, 1978
4048804 Support assemblies for use in mine workings Sep. 20, 1977
4020640 Shield structure May. 3, 1977
3932998 Mine roof support Jan. 20, 1976











 
 
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