DEVICE FOR CONSTRUCTING HORIZONTAL WORKINGS IN ROCK SALT Russian patent published in 1994 - IPC

FIELD: rock salt production. SUBSTANCE: device comprises auxiliary hole equipped with a pillar having packings on its lower outer surface. Telescopic shaft is hinged to pillar between packings. Nozzle head of shaft is capable of self-extending and has central and counter-opposed profiled holes. Lower part of central pillar is connected with extensible telescopic pipe having piston in upper part, and a spring on said piston. Holes are provided above the plugged end of pipe. Upper packing on additional pillar is installed above nozzle head of telescopic shaft while lower packing, under revolving joint. Packings and nozzle head of telescopic shaft are arranged on a common vertical axis. EFFECT: improved design. 3 cl, 1 dwg