Abstract: Core barrel head for connection to a core barrel for collecting core samples, and for connection to a latch assembly, to mount a drill assembly in a bore hole, with a sleeve for carrying the inner tube. A controllable locking device is arranged inside the core barrel head for locking the sleeve in a fixed rotational position relatively to the attached latch assembly, to allow measurement of the inclination and the orientation of the core. The invention also includes a survey instrument assembly provided with a connection link for connection to a spearhead, drill pipe, latch assembly, core barrel head or other drilling or geotechnical equipment.

Abstract: Grip and guiding device for directional drilling, in order to drill straight or curved holes with a predetermined path. The device includes a drill string (11-21) comprising parts which rotate during drilling, including a drill bit (11) or a water hammer on its front end and a non-rotating packer unit (14) with a packer tubing (28) comprising one or several projecting pressure pads (25,31-32) arranged behind the drill bit (11) or the water hammer. The pressure pad or pads are arranged to be pressed out towards the drill hole wall by means of the pressure from a drill fluid when this exceeds a certain level. The pressure pad (25) or the pressure pads (25A-25C) may be arranged asymmetrically and/or affects the packer tubing (28) asymmetrically, e.g. by having different heights. The pressure pad(s) force guiding ribs on the opposite side into the hole wall in order to prevent rotation of the packer unit (14). The pressure pad or pressure pads can on deactivation be withdrawn for performing linear drilling.