Abstract: The invention relates to an arrangement for drilling in soil and rock while simultaneously lining the drill hole with a lining tube. The arrangement includes an asymetric guide which is non-rotatably connected to a drill stem or like element, and an eccentric drill bit or crown which is journalled for limited rotation in the guide. The guide is arranged to lie solely against a part of one side of the inner surface of the lining tube during a drilling operation. Advantageously, the guide is supplemented with a guiding portion on the shank part of the drill bit located opposite the first guide. The drill arrangement enables wide adjustments to be made to the eccentric setting of the drill bit, and makes possible an advantageous forming of the cutting geometry of the drill bit.

Abstract: The invention relates to a coupling between a drill bit (7) and a drill shaft (6), which at least in an end position in one rotation direction gives an interlocking free from play between the elements, whereby simultaneously the drill bit (7) can be freely rotated in relation to the drill shaft (6) in opposite rotation direction. The drill bit (7) is at the inside provided with a helical spline (11) in which a parallel helical spline (10) arranged on the drill shaft (6) is engaged. The axial motion of the drill bit (7) is delimited by aid of a joint consisting of a peripheric notch (9) cut into the drill shaft (6) and a pin (8) firmly connected to the drill bit (7). The splines (10, 11) have the same pitch s, which is greater than the sum of the spline widths b'+b", and this brings about that the drill bit (7) can be freely rotated on the drill shaft (6) between two end positions.

Abstract: An arrangement for the handling of drill string elements, such as tubes or rods, in drill rigs, comprising means for transferring the drill string elements between a magazine and the drill string axis, a drill string centralizer at the front end of an elongated support for guiding the drill string, a spinning device on said transferring means for gripping and rotating a drill string element, said means being adapted to axially displace the drill string element during rotation thereof, and a sleeve brake mounted on the drilling machine for nonrotatably holding a coupling sleeve when the adapter of the drilling machine is disconnected from the drill string.