ROOFING OF POWERED SUPPORT UNIT Russian patent published in 1996 - IPC

FIELD: mining; extraction of coal seams with unstable roof by powered mining complexes and units. SUBSTANCE: roofing of powered support unit includes rigid body with through channels along longitudinal axis. The channels are formed by side walls and longitudinal partition between the lower and upper plates. endless bands, antifriction coating of upper plate, and aprons. Upper plate is made by two sheets separated by means of spacers installed with their long side across the roofing at some intervals. Located in the gap between plates symmetrical to roofing axis are apron plates with cutouts in edges in form of guide projections which are located in interval between partitions. Mounted on roofing ends between partitions and side walls are fairings with shanks secured in the gap between sheets of the upper plate and to lower sheet from below, and with recesses on external surface. Installed in the recesses are inserts of antifriction material. In this case, side walls and partitions at caved end projecting to the surface of fairing, for instance, through triple thickness of bands. EFFECT: higher efficiency. 3 dwg