HYDRAULIC INDIVIDUAL PROP Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: hydraulic individual prop ensures kinematic connection of external surface of individual body of safety valve with plunger of manual pump and provides for inversion of suction-pressure function to use it as relief device. Ensured are hydraulic communication of plunger force chamber with suction and pressure valves, safety valve with working space of prop by means of through channel made in shank of individual body, and interaction of plunger with check-valve through pusher. Plunger is made in piston and has through longitudinal channel for communication of internal space of rod with cylinder working space. EFFECT: higher efficiency. 2 dwg