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| Number | Title | Issue Date |
| 7237983 | Hydraulic shield support A hydraulic shield support is disclosed with at least two adjustable-length hydraulic props supporting a dedicated shield, which are connected through a control bank to a hydraulic fluid supply and borne on base shoes, and to which a pressure in excess of the pressu... | 07/03/2007 |
| 6957166 | Method and apparatus for load rate monitoring A system for real-time monitoring of the dynamic loading rate on support systems used in underground mines and other situations is provided. The load rate monitoring apparatus uses a programmable microcontroller to monitor and calculate the loading rates on the supp... | 10/18/2005 |
| 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 |
| 5685669 | Mining roof support A roof support having a stabilizing-guiding system for two spaced articulated quadrilateral linkages joined by a spacer element. The stabilizing-guiding system includes two coordinating links respectively, pivotably connected at one of the ends thereof to... | 11/11/1997 |
| 5454669 | Yield valve A yield valve comprises a valve body, a first inlet port, an outlet port, a valve seat, and a valve member movable between a first position in which it cooperates with the valve seat to prevent fluid communication between the inlet port and the outlet por... | 10/03/1995 |
| 5238330 | Displaceable mine roof support assemblies A mine roof support frame has a pair of spaced-apart floor skids on which hydraulic props support a roof engaging structure. A shifting mechanism with a ram in a trough-like housing and a guide beam is positioned between the skids and serves to displace t... | 08/24/1993 |
| 5073067 | Mine roof support A mine roof support comprises a canopy, a base section, hydraulic props for raising and lowering the canopy relative to the base section, a hydraulic valve for supplying hydraulic fluid under pressure to the props via a check valve, and a yield valve conn... | 12/17/1991 |
| 5039257 | Mine roof supports Mine roof support comprising a base including a pair of skids, a roof engaging canopy, jacks acting between the base and the canopy, an auxiliary jack connected to the base for lifting or lowering at least part of the base when the support advances and a ... | 08/13/1991 |
| 5033913 | Mine roof support A mine roof support comprises a ground engageable base section, a canopy, a shield section pivotally connected at one end to one end of the canopy and at the other end to one or more members connected to the base section, and hydraulic props for raising a... | 07/23/1991 |
| 4828433 | Roof supports A roof support employs an hydraulic piston and cylinder unit as an adjustment device between the goaf shield and the roof-engaging structure. The cylinder unit is mounted to the shield with the aid of a bearing body defining a cup receiving a spherical en... | 05/09/1989 |
| 4815898 | Roof supports To increase the height of operation of a shield type roof support an attachment is fitted to the floor sill or to each of a pair of spaced-apart floor skids. The attachment has side walls with bores for receiving pivot pins used to link the attachment to ... | 03/28/1989 |
| 4792261 | Mine roof supports A self-advancing mine roof support comprising a floor engaging base 11, a roof engaging canopy 12, hydraulic jacks 19a, 19b to urge the base and canopy apart, and a linkage system located towards the rear of the support. The linkage system comprises an in... | 12/20/1988 |
| 4773795 | Roof cap assembly with supporting cylinders for roof support mechanism A roof cap assembly of a roof support mechanism includes a main cap having extension bearing portions at its front end, a forward cap which is pivotally attached at its rear end to the extension bearing portions of the main cap, and two supporting cylinde... | 09/27/1988 |
| 4749311 | Foot element and cooperable strut element for use in a roof support mechanism A foot element of an adjustable roof support mechanism includes side walls that have aligned guide grooves in their facing surfaces and a spherical bearing surface in a floor portion therebetween. The guide grooves include inclined entry portions and enla... | 06/07/1988 |
| 4701079 | Pivot connections for use with mine roof supports A mine roof support has gap seals in the form of L-shaped plates on its roof cap and goaf shield. The side walls of the plates overlap at the junctures between the roof cap and goaf shield and are connected with pivot connections each of which is composed... | 10/20/1987 |
| 4607986 | Shield supports suitable for use in mines A shield support, suitable for use in mines, comprising a floor-engaging structure which includes two sledge or like elements disposed side-by-side and spaced apart one from the other, a roof-engageable canopy, a shield mounted for pivotal movement with r... | 08/26/1986 |
| 4586851 | Levelling ram for roof-shield mine support systems In a roof-shield support system employed in mines, at least two levelling rams each acting between a shield frame unit and an associated gap-seal plate, the latter being arranged so as to be slidable relative to the associated shield frame unit. Each leve... | 05/06/1986 |
| 4563111 | Mine roof supports A mine roof support has a roof engaging structure 13 and a floor engaging base 14, spaced apart by extensible hydraulic jack means 15 and 16. The roof engaging structure and the base are interconnected by a pivotal linkage device 23, 24 arranged so that, ... | 01/07/1986 |
| 4560306 | Coal face support A mine roof support comprises a base formed of two base members, a beam disposed therebetween, jacks for lifting the base members or the beam one relative to the other and a jack for advancing the base member or the beam one relative to the other. A roofi... | 12/24/1985 |
| 4552487 | Mine roof support unit having dust suppression means A mine roof support unit has a roof shield for supporting the roof of a mine working, and a goaf shield for screening off the goaf space of the working. The mine roof support unit is provided with dust suppression means constituted by a flat-section spray... | 11/12/1985 |
| 4480946 | Gob canopy for a mine roof support A support for the roof in longwall mining operations includes a gob canopy at the rear of a roof canopy. The gob canopy can move about a vertical pivot and a horizontal pivot by operation of a hydraulic actuator. To stabilize the support, the gob canopy m... | 11/06/1984 |
| 4462637 | Control apparatus for inclination of longwall guide Apparatus for controlling the cutting horizon of a mineral winning plough comprises means for pivoting the guide along which the plough moves. The guide is fixed to the face side of the conveyor, and said means acts on the goaf side of the conveyor. Said ... | 07/31/1984 |
| 4390308 | Advance mechanism for a mine roof support assembly A roof support assembly is constituted by a plurality of roof support units and a plurality of advance mechanisms. The units are positioned side-by-side along a longwall face of a mineral mining working. Each advance mechanism comprises a pair of generall... | 06/28/1983 |
| 4382722 | Nine lining structure The roof support according to the invention is between the roof-bar (2) and the sill piece (1) with at least one system of levers (3,4) connected by articulation with each other and connected by articulation with the roof-bar (2) and the sill piece (1) so... | 05/10/1983 |
| 4352602 | Roof support for a mine gallery which extends at a relatively large angle inclined to the horizontal A roof support for a mine gallery which extends at a relatively large angle to the horizontal comprises an upper, a middle and a lower roof support unit arranged adjacent each other and having each a pair of elongated transversely spaced skids rigidly con... | 10/05/1982 |
| 4315386 | Portal building structures A portal building frame formed of asymmetrical metal sections comprises a roof frame member supported on columns by means of knee connectors which telescopically engage with the roof frame member at each end thereof and with the columns. The connectors ar... | 02/16/1982 |
| 4293247 | Seals for mine roof supports A mine roof support has a roof-engaging frame structure supported by hydraulic props on a floor frame and pivotably linked to a goaf shield. The roof frame and goaf shield have L-shaped seal plates at their sides. The seal plates are subjected to a latera... | 10/06/1981 |
| 4252477 | Mine roof support A mine roof support has a base and a roof shield pivoted to the base and carrying at its upper end a pivoted cap which is urged upwardly against the mine roof by a hydraulic pit prop reacting between the cap and the base. The lower end of the roof shield ... | 02/24/1981 |
| 4236850 | Shield timbering frame for timbering mines A shield timbering frame for timbering mines adjacent a mining face, comprises a horizontal floor-engaging skid and a breaking shield extending obliquely over the skid which is connected to the skid by a pair of longitudinally spaced, lemniscate guide rod... | 12/02/1980 |
| 4231684 | Shield type support for use in underground mining with lemniscate guide rods A shield type support for use in underground mining comprises a floor construction with one or more pressure operated extensible and retractable rams mounted on the floor and connected at their upper end to a roof-member. The roof-member is articulated at... | 11/04/1980 |
| 4222686 | Mine roof support In a mine roof support in which a roof shield, pressed by hydraulically operated, collapsable and extensible props, arranged between the roof shield and a sole plate, against the roof of a mine gallery, is connected at its rear end to a rear shield, which... | 09/16/1980 |
| 4183701 | Coupling gear for lemniscate shield timbering frame A coupling gear for connecting two side-by-side, longitudinally extending shiftable skids of a divided footwall skid of a lemniscate shield timbering frame for actuation by a fluid pressure operated piston and cylinder combination which is adapted to be c... | 01/15/1980 |
| 4136999 | Canopy and shield structure for a supporting shield in a seam-like mine deposit A canopy and shield structure for supporting a shield adjacent a working face in a seam-like mine deposit, comprises a floor skid which is connected through an extensible and contractable prop at the working face end to the working face end of a canopy ad... | 01/30/1979 |
| 4085592 | Shield tubbing for longwalls A shield tubbing for longwalls comprises a support tub and a break shield is pivotally mounted on said support tub. A double arm balance beam is pivotally supported on said tub and it includes a first arm portion which is connected at one end to a hydraul... | 04/25/1978 |
| 4077223 | Roof support shield structure for use in an excavation A roof-support shield structure for use in an excavation to support and shield a roof above a floor of an excavation, such as a coal mine, comprises a sill beam adapted to be supported on the floor, and an inclined shield having one end pivoted to the sil... | 03/07/1978 |
| 4048804 | Support assemblies for use in mine workings A mine support assembly is composed of separate floor-engaging sills each supporting one or more telescopic props and a goaf shield pivotably connected to a roof cap. The props can be extended or retracted to raise or lower the roof cap. The shield is div... | 09/20/1977 |
| 4020640 | Shield structure The invention relates to a shield structure particularly adapted for longwall mining providing a protected area that effectively insures operator safety even if total collapse of the mine roof should occur. The prop supporting the load-bearing cap of the ... | 05/03/1977 |
| 3932998 | Mine roof support A mine roof support for use at a mineral face comprises at least one prop, a canopy or roof-engaging structure adapted to lie against the roof of a mine working, a base member adapted to lie on a floor of said mine working, and a shield flexibly connectin... | 01/20/1976 |
