Mine stopping

A mine stopping comprising a plurality of elongate extensible panels extending vertically from the floor to the roof of a passageway in a mine, each panel comprising upper and lower panel members each of channel shape in cross section having a web and flanges at opposite sides of the web, one of the members having a sliding fit in the other with the flanges extending toward one face of the stopping, said panels impeding flow of air through the passageway except for a space at a side of the passageway because of irregularity of the side of the passageway, and means for impeding flow of air through said space comprising at least one side extension for the stopping, said side extension comprising a bar and a relatively long and narrow plate secured to the bar with a portion of the bar projecting from one end of the plate constituting its inner end;

• said extension being mounted on said one face of the stopping extending generally horizontally with said plate in a generally vertical plane and extending into said space for blocking said space;
• said projecting portion of the bar lying against flanges of certain of said members and means for securing said projecting portion of the bar to said flanges.