Drilling device for drilling and reaming of a hole

Details Drilling device for drilling and reaming of a hole Drilling device for drilling and reaming of a hole

2007-08-23

2011-12-27

Thompson, Kenneth L (Department: 3676)

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by cam or gear axially rotatable...

C175S019000, C175S096000, C175S279000, C175S293000, C175S415000

Reexamination Certificate

active

08083010

ABSTRACT:
A drilling device used for drilling into ground, rock or for reaming a predrilled hole includes several hammering bits in a circular shape and equipped with hammers, whereupon they together drill a hole which has a larger diameter. A casing tube can be pulled out of the hole/pushed into the drilled hole. A tubular, rotatable drill rod tube resides in the casing tube. The hammers are located in a circular shape and are each attached to the outer surface of the drill rod tube by joint/hinge attachments lying essentially in the drilling direction. Rotation of the drill rod tube in a first direction turns the hammers and associated bits outwardly from the drill rod tube, and rotation in another direction turns the hammers with their bits inwardly towards the drill rod tube so that they can be pulled away with the drill rod tube from inside the casing tube.

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patent: WO 9201856 (1992-02-01), None

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