公开(公告)号：US3702162A

公开(公告)日：1972-11-07

申请号：US3702162D

申请日：1970-12-15

Applicant: TAMPELLA OY AB

Inventor： GRONFORS TEUVO

IPC: E21B7/02 ,  E21B15/00 ,  E21B15/04 ,  E21B19/08 ,  E21C41/00 ,  E21C41/16 ,  E21D9/00 ,  E21C11/02

CPC classification number: E21D9/006 ,  E21B7/025

Abstract: THE PRESENT INVENTION CONCERNS A RING DRILLING DEVICE ADAPTED FOR OPERATING IN A TUNNEL AND COMPRISING A BOOM ROTATING ABOUT ITS LONGITUDINAL AXIS AND TO WHICH IS ATTACHED A CRADLE TRANSVERSE THERETO FOR THE FEEDING DEVICE FOR THE ROCK DRILL. ON THE ROTATABLE BOOM, THERE IS MOUNTED A BOOM HEAD TURNABLE ABOUT AN AXIS PERPENDICULAR TO SAID BOOM, THE CRADLE BEING MOUNTED ON THIS TURNABLE BOOM HEAD TO BE ROTATABLE ABOUT IS LONGITUDINAL AXIS.