Clamping pulley

A clamping pulley comprising:

• a securing head,
• a first flange fixed to the securing head,
• a first rotation shaft extending from the first flange,
• a first sheave mounted rotatable around the first rotation shaft, the first sheave being mounted rotatable in one direction of rotation only, and
• a locking cam mounted movable with respect to the first sheave so as to move away from or towards the first sheave, the locking cam being mounted movable between a first position and a second position,
• wherein:
• the first rotation shaft is mounted fixed with respect to the first flange and to the securing head,
• the locking cam is mounted movable with respect to the first flange and to the securing head,
• a spring is fitted to exert a force on the locking cam moving the locking cam towards the first sheave, and
• a handle is mounted on the first flange or on the securing head, the handle being functionally connected to the locking cam to move the locking cam between the first position and the second position, the handle being functionally connected to the locking cam by means of a set of cogs,
• wherein the handle comprises a pin collaborating with a stop, the pin being designed to come into contact with the stop to form a mechanical connection between the handle and the locking cam and rotation of the handle generates a rotation of the stop and rotation of the locking cam and wherein the locking cam is associated with a first cog-wheel collaborating with a second cog-wheel forming the stop.