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Class Information
Number: 405/300
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > Self-advanceable > Paired
Description: Method or apparatus wherein two props are laterally connected so that when one prop is in the roof supporting orientation it serves as an anchor for advancing the other prop.

Sub-classes under this class:

Class Number Class Name Patents
405/301 Nested 4

Patents under this class:

Patent Number Title Of Patent Date Issued
5608998 Panel for lining manholes and the like Mar. 11, 1997
4957327 Methods of translating a face support Sep. 18, 1990
4411559 Mining system Oct. 25, 1983
RE31346 Advance mechanism for a mine roof support assembly Aug. 16, 1983
4360102 Conveying apparatus for use in mineral mining Nov. 23, 1982
4293248 Walking roof support Oct. 6, 1981
4242014 Pivot joint for underground mining installations Dec. 30, 1980
4195953 Advance mechanism for a mine roof support assembly Apr. 1, 1980
4077223 Roof support shield structure for use in an excavation Mar. 7, 1978
4073150 Suspended valve control device Feb. 14, 1978
4008578 Pit prop assembly Feb. 22, 1977
3995907 Underground excavating machine having independently movable half-frames Dec. 7, 1976

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