Tensioning device with telescopic safety block for tension of a catenary

摘要

Tensioning device (4) with telescopic safety block (5) for the tension of a catenary, in particular, for electric cables (8) of railway lines, undergrounds and trolleybuses comprising at least one crosspiece (12) extending along a main direction (X-X), at least one fixed pulley (20) being joined to the crosspiece (12), at least one mobile pulley (24). said mobile pulley (24) being joined to a mobile carriage (28) parallel to the main direction (X-X), the mobile carriage (28) being mechanically connected to an anchorage (32) for the electric cable (8) of a railway line to be kept taut, at least one wire (40) connected to the mobile carriage (28) and a counter weight (52) to ensure the tension of the electric cable (8) of the railway line, the wire (40) being at least partially wound around said fixed pulley (20) and said mobile pulley (24). Advantageously, the device (4) comprises at least one longitudinal member (56) mechanically attached to said crosspiece (12), wherein the mobile carriage (28) is mechanically connected to at least one support stem (60), and the longitudinal member (56) is hollow so as to telescopically house and guide the support stem (60) parallel to said main direction (X-X).