DEVICE FOR BOREHOLE PUNCHING IN GROUND Russian patent published in 2006 - IPC E02F5/18 E21B7/04 

FIELD: building equipment, particularly to form boreholes in ground for trenchless service line laying.

SUBSTANCE: device comprises vibratory-percussion mechanism, transition member with rest and deflecting wedge connected one to another by deflection limiter. The deflection limiter is spring-loaded and has thrust bush and rod pivotally secured to deflecting wedge. Heat-pressure members formed of shape-memory monocrystals are installed in conical depressions of deflecting wedge and transition member. The heat-pressure members have heating means, which provide enlargement thereof so that the members may form curvilinear part of borehole trajectory.

EFFECT: increased reliability, accuracy and rate of bore drilling along predetermined trajectory and increased range of borehole deviation regulation.

2 cl, 3 dwg