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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:
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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