Pipeline pig for lining pipe lines

In a pipeline pig for lining a pipe line with an internal coating of a solidifying plastic composition with which the pipe line is spread by means of the pig which is adapted during operative movement of the pig to be drawn in the pipe line in only one direction of movement of the pig with respect to the pig, the pipeline pig having at least one spreader body and at least one forward and one rear guide body, the improvement wherein

• each said guide body comprises means for exact central and coaxial guiding of the spreader body in the pipe line comprising,
• at least three narrow, resiliently elastic guide pieces bent into U-form, each of said guide pieces comprising a middle part with forward and rear U-legs at ends thereof and rounded transitions from the middle part to the U-legs,
• said middle parts extending in an axial direction of the pipeline pig for the exact central and coaxial guidance of the pipeline pig in the pipe line by abutment on an inner wall of the pipe line and being offset in relation to one another in a circumferential direction,
• means for securing said forward U-legs non-displaceably in the axial direction in the pig,
• a common bearing means for displaceably mounting said rear U-legs in the axial direction in the pig, said rear U-legs of said guide pieces being secured to said common bearing, said forward U-legs being located forwardly with respect to said only one direction of movement of the pig and said rear U-legs being located rearwardly, opposite with respect to said only one direction of movement of the pig.