Device for lifting an air suspended axle

A spacing arm for a lift of a rolling axle of industrial vehicles, trailers and semi-trailers, intended for being incorporated in lifting devices of the type consisting of side parts (4) coupled in a transverse bolt (2) linking in an articulated manner a support (1) of the pneumatic suspension and a leaf spring arm (3) of a certain axle to be lifted, constituted of a spacing arm (11) divided by a bending line in a U-shaped transverse section (14) which is fixed to a bellows (6) and supports the leaf spring arm (3), and a longitudinal section in which a bar (16) is fixed which houses a spacer (7), internally fixed to the side parts (4) with regard to which the spacing arm (11) rotates, actuated by the bellows.