ROLE FOR THE EXTENSION OF CASES IN A CASES EXTENSION PLANT AND CASES EXTENSION PLANT COMPARDING THIS ROLLER

摘要

Roller unit for laying cables (11, 12, 13) that comprises a frame (23, 23') where at least one pair of sliders (25, 25') are positioned aligned parallel to a laying direction (S1, S2) of the cables (11, 12, 13) and each provided with at least one pair of wheels (28, 28a, 28b) to support a cable (11, 12, 13) to be laid; the sliders (25, 25') are hinged to the frame (23, 25') and rotatable around respective axes of rotation (A, A') in order to vary the inclination thereof with respect to the frame (23, 23') and therefore to vary the radius of curvature (R, R1, R2, R3) of the supported cable (11, 12, 13); at least one of the sliders (25, 25') comprises an oscillation limiting tooth (30, 30') provided in at least one portion (32, 32') of the slider (25, 25') protruding from the frame (23, 23 ') and configured to abut against a lateral wall (31, 31) of the frame (23, 23 ') when the slider (25, 25'), rotating around the respective axis of rotation (A, A'), exceeds a certain inclination, so as to prevent an excessive reduction of the radius of curvature (R, Rl, R2, R3) of the cable (11, 12, 13) supported by the slider (25, 25').