DEVICE FOR FORMATION OF HOLES IN GROUND Russian patent published in 1997 - IPC

FIELD: construction engineering. SUBSTANCE: device can be used for making holes in ground without excavation of ground. It has geared motor, working member in the form of rolls successively installed on driven shaft. Axes of symmetry of rolls are displaced at angle to axis of working member. Adapter rigidly connects geared motor output shaft with shaft of working member. Also provided is housing in the form of hollow cylinder with internal circular protrusion and flange fastened to geared motor casing. Eccentric bush of last roll has hollow cylindrical tail without eccentricity which together with flange of working member shaft enters into housing space. Circular protrusion of housing is seated in groove created between end faces of cylindrical tail of bush, adapter flange and cylindrical surface of working member shaft flange. Working member shaft and adapter are hollow. EFFECT: high efficiency. 1 cl, 3 dwg