Cone belt tightening device

A tightening device for cone belts and the like for use in cone belt transmissions, including at least one preferably driven cone belt pulley (5) which is axially or substantially axially displaceable relative to at least one other, preferably driving cone belt pulley (4) mounted on a shaft, and a cone belt (7) interconnecting said cone belt pulleys, said tightening device engaging one run of the cone belt by means of a rotary member, wherein the tightening means includes a preferably spring-loaded support lever (8) arranged adjacent one (4) of the cone belt pulleys and adapted to pivot about a first axis (Y) situated substantially parallel with the cone belt pulley shaft and also about a second axis (X), said second axis being located between said pulleys (4, 5) and being generally perpendicular to said first axis (Y), and a tightening pulley (10) preferably provided with a cone belt groove is fitted at a free end of said support lever (8) in order to maintain the engagement of the tightening pulley (10) independently of any displacement of the cone belt runs (7', 7") caused by the relative displacement of the cone belt pulleys (4, 5).