Device for charging drillholes

Claim 1

Device for the introduction of explosive in the desired place in a drillhole, characterized by a climber, which climbs on the walls of the drillhole and is equipped with locomotion means powered from a fluid pressure source and designed to propel the climber in the desired direction in the drillhole, said locomotion means including fluid pressure actuated expansion means associated with the climber and designed to press against the walls of the hole as to stabilize the climber in the hole and prevent it from falling downwards therein, a main valve arrangement positioned rearwardly of the climber relative to its direction of travel as the climber enters the drillhole to introduce an explosive thereinto, and operative to control the supply of fluid under pressure to said locomotion means, and means for providing an explosive charge in the drillhole forwardly of said climber, said valve arrangement including means for selectively moving said climber forwardly and backwardly, respectively, in the drillhole, said climber comprises two parts capable of motion relative to each other, enabling the climber to alternately extend and contract in the direction of the drillhole while said expansion means press against the walls of the hole, and further characterized in that said two parts are diposed to be positioned one forwardly of the other in the drillhole with the front part of said two parts of the climber engaging said explosive charge, and wherein said front part has thereon means detachable from the other of said two parts of said climber, whereby said other part can be withdrawn from the drillhole and reused.