MINE HYDRAULIC PROP Russian patent published in 2003 - IPC

FIELD: mining; applicable in mines hazardous for rock burst. SUBSTANCE: mine hydraulic prop has body in form of cylinder accommodating hollow rod with hole for communication of rod cavity with atmosphere, piston separating the cylinder for head end and rod end, corrugated flexible member with plug, installed in rod end corrugated flexible member with plug, installed in rod end corrugated flexible member with plug, installed in rod end along the line of load acting, whose one end fixed to rod and the other installed for axial motion independent of rod. Fixed end of corrugated flexible member is secured to rod internal end serving as plug. The other end of corrugated flexible member installed for separate axial motion independent of rod is secured to piston separated from rod. EFFECT: reduced value of dynamic load pulse in displacement of enclosing rocks. 1 dwg