a and an inner rear stationary pipe section 30 b the two sections are joined with the help of a free joint such as a slew ring 50 only shown schematic on fig3 and 4 the free joint 50 ensures that the outer pipe 30 a can be rotated while the inner pipe is not rotated this ensures that the pipes wheels can move independently of each other as will be explained more in detail in the following the free joint slew ring does not touch the piston cylinder unit 34 36 which is positioned inside the pipe sections 30 a 30 b each pipe section 30 a and 30 b respectively is fitted with its own pair of wheels 52 54 and 56 58 respectively both at its shorter distance from the slew ring 50 each wheel in the pair stands diametrically on opposite sides of the respective pipe sections as shown in the cross section in fig5 the wheel diameter d corresponds approximately to the height h of the extended square box formed housing 40 i e the wheels fill the height with a sufficient clearance so that the wheels can roll inside the box there can be a bigger clearance sideways to make it possible for one of the wheel pairs to roll around the longitudinal axis of the pipe when the pipes are made to be pushed outwards to launch the rescue basket or stretcher the housing 40 comprises appliances which force the outer pipe 30 a to be rotated in about the axial direction so that the basket 20 tilts downwards while the inner pipe 30 b.