DRILLING DEVICE FOR DRILLING AND REAMING OF A HOLE

摘要

Drilling device for drilling into ground, rock or for reaming a predrilled hole which drilling device comprises, if needed, a bit (2) which drills the central part of the hole and a hammer (1) for it, or the mentioned bit (2) is at least partly replaced with an endpiece which takes control of the predrilled hole whereupon in both cases the drilling device additionally comprises several hammering bits (4) placed in a circular shape and equipped with their own hammers (3) whereupon they together drill a hole which has a larger diameter and the drilling device comprises a casing tube (6) which can be pulled out of the hole/pushed into the hole which is created during drilling and belongs to the drilling device and also essentially in the middle of the drilling device residing tubular, rotatable drill rod tube (16). The hammers (3) located in a circular shape are each attached to the outer surface of the drill rod tube (16) with the help of joint/hinge attachments (17, 19) essentially in the drilling direction and rotation of the drill rod tube (16) in the first direction turns the drilling devices (3) from the drill rod tube towards it side in the mentioned joint/hinge attachment of the hammers and rotation in another direction turns the hammers (3) with their bits (4) towards the drill rod tube (16) so that they can be pulled away with the drill rod tube (16) from inside the casing tube (6).