Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1993-02-09
1993-10-12
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405299, E21D 2304
Patent
active
052520064
ABSTRACT:
A mine roof support employs a pair of floor skids carrying hydraulic props on which a roof-engaging structure is mounted. A goaf-shield is pivotably mounted to the roof-engaging structure and is connected with a lever system to the floor skids. A shifting and guide mechanism is disposed between the floor skids and takes the form of an hydraulic ram connected at the rear to a floor rail disposed beneath the ram. The ram is supported at the front end by a bridge member connecting the front ends of the skids together. An hydraulic lifting unit is mounted on the bridge member and when extended the unit bears on the floor rail to partially lift the skids as the shifting ram is operated. The lifting unit can be mounted to the bridge member in one of several alternative height positions. To ensure the lifting unit is always maintained above the lower surface of the bridge member when the lifting unit is retracted a stop piece is mounted beneath the bridge member to effectively provide an extension of the lower surface of the bridge member.
REFERENCES:
patent: 3811288 (1974-05-01), Wehner
patent: 4311417 (1982-01-01), Bower et al.
patent: 4600340 (1986-07-01), Rosenberg
patent: 5039257 (1991-08-01), Bithell
patent: 5100263 (1992-03-01), Woodford et al.
Corbin David H.
Westfalia Becorit Industrietechnik GmbH
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