Waterproofing device for an actuator

A device for sealing an actuator comprising:

• an elongated body;
• a drive shaft in which the drive shaft and elongated body move relative to each other, along longitudinal axes thereof;
• and
• a sleeve which covers at least partially both the elongated body and the drive shaft, said sleeve having a first portion shaped as a bellows portion and a second portion having a shape like the elongated body so that the second portion is adapted to be fitted on the elongated body and blocked at one end thereat, the bellows portion being positioned in correspondence of the drive shaft and locked on the drive shaft at an opposite end of the sleeve so that the sleeve is integral with the shaft itself,
• wherein during movement of the actuator, the bellows is compressed or extended, and when the bellows is in an extended position, which corresponds to the actuator in an open position, the second portion of the sleeve substantially adheres to the elongated body and all air within the sleeve remains entirely inside the bellows portion, and when the shaft is retracted inside the cylinder, air thrust by closing of coils of the bellows portion moves into a rear part of the sleeve, resulting in an increase in diameter of the second portion, which detaches itself from the elongated body.