Device for demounting the second bead of a tire from a rim and respective demounting method

摘要

The present invention relates to a demounting device that can be applied to a tire demounting machine (11) for demounting the second bead (T2) of a tire (T) from a rim (W) rotatably mounted on the tire mounting-demounting machine (11) around a rotation axis (x-x), after the first bead (T1) of said tire has already been demounted from the first edge (W1) of the rim (W), the device comprising an abutment element (4) having a substantially flat work surface (4a) and being designed to externally abut at the work surface (4a) against the second bead (T2) and to move it via drive means (2a) close to a first edge (W1) of the rim (W), a hook-like extraction member (5) being suitable for being moved in a substantially transverse direction with respect to the rotation axis (x-x) of the rim (W) very close to the work surface (4a) between a withdrawn rest position inside the bulk of the abutment element (4) and an extended work position in order to be inserted between the abutment element (4) and the second bead (T2).