GROUND HOLE REAMER Russian patent published in 1996 - IPC

FIELD: construction and mining industries. SUBSTANCE: ground hole reamer includes pneumatic punch with resting collar put on pneumatic punch and manufactured in the form of longitudinal sections interconnected and coupled to pneumatic punch with the aid of flexible couplings which interact with resting collar if displaced axially, reamer proper and member for radial fixing of sections. For increase of operational reliability of hole reamer outer side surface of sections has two diameters different by value and member for radial fixing of sections is fabricated in the form of ring located on side surface of sections of smaller diameter. Ring can be installed in tail part of reamer. It can also be connected with flexible coupling to pneumatic punch and to one section. EFFECT: expanded application field for drilling holes of various purpose. 3 cl, 4 dwg