POWERED PNEUMATIC SUPPORT Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: powered pneumatic support has caving and face beams which are connected with their upper ends to holding device through supporting rollers, and closed flexible members with upper and lower guide rollers. Lower branches of flexible member are passed under beams. Beam lower ends are connected with tensioning devices. Tensioning device is made in form of axle with lower guide roller movably installed in longitudinal recess on beam lower end by means of cover strip and movable bolt. Holding device has additional beam with supporting rollers and supporting pneumatic balloon on caving end, and supporting beam for installation on working floor square to additional beam. Face end of additional beam rests on supporting beam. EFFECT: higher efficiency. 4 dwg