Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7177709 | Controller for underground mining A controller is disclosed for control operations in underground mining, especially for controllers to control support shields. The controller utilizes a central unit with a microprocessor and assigned, programmable memory devices for the storage and processing of so... | 02/13/2007 |
| 6945738 | Method and apparatus for safety protection of temporary roof support Embodiments of the present invention are directed to a method and apparatus for safety protection control of temporary roof support. In one embodiment, a temporary roof support has a load sensing member. In another embodiment, a beam structure of temporary roof supp... | 09/20/2005 |
| 6910834 | Mine prop A mine prop is comprised of an elongate tube having a slenderness ratio that would generally allow buckling or kneeling of the elongate tube when exposed to a sufficient axial force. A plurality of elongate support members having a length less than the elongate tube... | 06/28/2005 |
| 6416258 | Ground advance shoring system This invention is related to a ground advance shoring system and the construction method using such a system. The system of this invention comprises a railway assembly for being set up on a ground; at least one movable device disposed on the railway assem... | 07/09/2002 |
| 5833399 | Apparatus for use in forming piles An apparatus for forming a pile in the ground has an elongate member (12, 112), at least one helical thread flight (16, 116) on the elongate member (12, 112), and a torque transmission device (24, 124) to transmit torque from a drive structure to the elon... | 11/10/1998 |
| 5423638 | Mine roof supports A mine roof support having means for monitoring the angles made by the canopy 11 and the base 10 with respect to a datum. The angular information may be gathered in a number of different ways and the information used to control subsequent movements of the... | 06/13/1995 |
| 4978248 | Advanceable mine roof supports A roof support has a pair of floor sills carrying hydraulic props supporting a roof-engaging structure. The floor sills have guide rails on their adjacent sides which mate with a slidable guide block which connects to a shifting ram and thrust mechanism b... | 12/18/1990 |
| 4511290 | Support frame for underground mining operations The invention relates to a structural frame for mining operations wherein at least one stabilization element is provided and coupled between the roof of the seam cap and the floor of the seam support base which is pivotable around a pivot axis extending i... | 04/16/1985 |
| 4474510 | Hydraulic mine-roof support The support assembly is made up of a floor-standing runner member 1, a hydraulically vertically-adjustable prop 2 mounted on the same, a roof canopy 3 supported by the same and a rockfall shield 4 hinged to the same on the backfill side which is guided to... | 10/02/1984 |
| 4324510 | Apparatus for supporting a mine roof support assembly Apparatus is disclosed for supporting the lowermost roof support unit of a series of roof support units positioned side-by-side in an inclined longwall working. The support apparatus comprises a beam mounted for pivotal movement in a plane parallel to the... | 04/13/1982 |
| 4268193 | Mine roof supports A mine roof support comprises a plurality of hydraulically extensible chock legs 5,6, articulated at upper ends thereof to one or more roof beams 3 and at lower ends thereof to one or more base members 1, a shield 9 pivotally connected to a rearward part ... | 05/19/1981 |
| 4139326 | Mine roof supports A mine roof support comprises a plurality of hydraulically extensible chock legs articulated at upper ends thereof to one or more roof beams and at lower ends thereof to one or more base members, a shield pivotally connected to a rearward part of the base... | 02/13/1979 |
| 4117687 | Mine roof supports A mine roof support comprises at least one hydraulically extensible chock leg connected at its upper end in articulated manner to a roof beam of the support, and connected at its lower end in articulated manner to a base member of the support, a pair of l... | 10/03/1978 |
| 3996753 | Mine roof support The invention is concerned with a mine roof support, for use at a mineral face, comprising a base member, extensible props means mounted on said base member, a roof-engaging structure mounted on said prop means for application thereby to a roof to be supp... | 12/14/1976 |
