Roof supports
AssigneeGewerkschaft Eisenhutte Westfalia
InventorsEgon Wojaczek, Klaus Seeberger, Harry Rosenberg, Wolfgang Stradtmann
Life of this patent
Estimating the term…
Abstract
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 the floor sill or skid and to guide levers connected to the goaf shield. A transverse body extends between the side walls and defines a socket for forming part of a ball-and-socket joint connecting the attachment to a hydraulic prop. The side walls of the attachment have under surfaces which rest on a support surface of the skid or sill near the working face.
Claims12
In a roof support for use in mineral mining comprising a floor-engaging structure, a roof-engaging structure, at least one hydraulic prop, means for flexibly connecting the prop to the roof and floor-engaging structures, a goaf shield, means pivotably connecting the goaf shield to the roof-engaging structure and guide levers pivotably interconnecting the goaf shield to the floor-engaging structure;
- the improvement comprising releasable means attachable to the floor-engaging structure to provide an alternative linkage between the guide levers and the floor-engaging structure and an alternative connection between the prop and the floor-engaging structure to increase the effective height of operation of the support, pivot pin connections for connecting the attachment means to the floor-engaging structure with differental clearance relative to their positions and inter-engaging slidable complementary surfaces of the attachment means and the floor-engaging structure over a zone spaced from the pivot pin connections.
In a roof support for use in mineral mining comprising a floor-engaging structure, a roof-engaging structure, at least one hydraulic prop, means for flexibly connecting the prop to roof and floor-engaging structures, a goaf shield, means pivotably connecting the goaf shield to the roof-engaging structure and guide levers pivotably interconnecting the goaf shield to the floor-engaging structure;
- the improvement comprising auxiliary structure releasably attachable to the floor-engaging structure to provide an alternative linkage between the guide levers and the floor-engaging structure and an alternative connection between the prop and the floor-engaging structure to increase the effective height of operation of the support, pivot pin connections for connecting the attachment means to the floor-engaging structure and inter-engaging slidable complementary surfaces of the attachment means and the floor-engaging structure over a zone spaced from the pivot pin connections.
Dependencies are inferred from the claim text.