DEVICE FOR GROUND WELLING Russian patent published in 2011 - IPC E21F5/18 

FIELD: mining.

SUBSTANCE: device includes the housing containing hammer with through longitudinal channel the bore of which forms together with air distributor an internal chamber. Air distributor is made in the form of two tubes installed coaxially with possibility of axial displacement relative to each other and sleeve arranged with possibility of axial displacement along the above internal tube. Sleeve consists of two parts connected by means of elastic element. Supply line of compressed air is provided. Air distributor has increased friction element installed on inner surface of sleeve and contacting with internal tube.

EFFECT: improving operating reliability, reducing compressed air losses, easy switch-over of the device to reverse mode without cutting-off the compressed air owing to installing on air distributors of increased friction element and mating conical surfaces on internal and external tubes.

2 cl, 1 dwg