Unit for drilling bore hole in ground has driven tube with drill head - and liq. supply, and coaxial larger-dia. extendable return line to liq. reservoir raisable to vary liq. pressure in bore hole

Abstract

Abstract The mechanism for drilling a bore hole in the ground comprises a tube with larger-dia. drilling head at its lower end provided with an opening to pass liq., a drive for the tube, and a pump to supply liq. to the tube interior. - A return for the liq. surrounds the tube and its lower end sealingly surrounds the bore hole at ground level whilst its upper end extends to a predetermined level above the ground, means being provided to adjust the height of the liq. column in the line above the liq. in the bore hole.

Inventors

No inventors recorded.

Bibliographic Details