Abstract: This invention relates to a mine roof support comprising a floor engaging member, a roof engaging member, hydraulic or other variable length struts supporting the roof engaging member, a shield pivotally connected at its upper end to the roof engaging member and a pair of links secured between a pair of pivotal connections on the lower portion of the shield and a pair of pivotal connections on the floor engaging member, so arranged as to ensure that the upper end of the shield will move in a substantially straight path perpendicular to the length of the floor engaging member. The invention provides that both shield and the top link are made of substantial width to guard against entry of debris from the goaf behind the support into the working space formed between the floor engaging member and the roof engaging member.

Abstract: A mine roof support comprising a roof engaging canopy, a floor-engaging means, a pair of shields pivotally secured to the canopy and extending downwardly and rearwardly in side-by-side relation over the floor-engaging means, a quadrilateral linkage securing each shield to the floor-engaging means and extensible strut means for adjusting the height of the canopy so arranged that the canopy may tilt about a transverse horizontal axis and a fore and aft axis to engage the roof, the shields being capable of providing differing height settings to accommodate canopy tilt about the fore and aft axis.

Abstract: A mine roof support arranged for propulsion over a mine floor by means of an advancing jack wherein the advancing jack is arranged to exert an inclined force on the support of which one component is parallel to the floor for propelling the support along the floor and the other component lifts or tends to lift the support from the floor thereby reducing frictional engagement with the floor.