IMPACT ACTION DEVICE Russian patent published in 2008 - IPC E21C37/00 

FIELD: mining.

SUBSTANCE: impact action device includes housing provided with an inner bore that receives and allows axial displacement of an impact piston and working tool (spear) arranged coaxially towards said piston. On the top portion of a tool shank there is an annular groove. The lateral surface of said groove mates a limitedly axially displaceable split ring receiving the working tool and at the same time mating the housing surface. Besides, the thickness of said ring is less than the thickness of said groove and its bottom end surface permanently contacts the top end of a rubber-metal shock absorber receiving the working tool. The bottom end of the shock absorber permanently contacts an annular boss formed on the inner side of the housing.

EFFECT: enhancement of reliability, design simplicity and economic feasibility of the device.

2 cl, 5 dwg