Device for disassembling a tire from a wheel rim and a method of disassembling a tired wheel

A method of disassembling a tire bead from its respective wheel rim edge, comprising the following steps in sequence:

• arranging a disassembling bill tool in an insertion position in which a work end thereof is abutting against said tire bead of a tired wheel to be disassembled,
• causing a relative movement between said disassembling tool and said wheel rim in a direction parallel to the axis of rotation of said tired wheel or of said wheel rim, thereby forcing the work end of said tool to enter between the tire and the wheel rim and to go beyond the tire bead,
• causing a relative movement along an orthogonal direction to said axis of rotation between wheel rim and tool, thereby causing an angular movement of said tool between said first insertion position and a second extraction position, where said work end is facing in the direction moving away from the axis of rotation and is forced grasping with said tire bead that is thus radially widened, thereby energizing an interception element to lock said tool in said second extraction position, and thereby preventing any backwards angular movement of said tool,
• moving backwards said disassembling tool and/or said wheel rim parallel to said axis of rotation, and
• causing said wheel or said tool to rotate, thereby bringing the whole tire bead beyond the edge of the wheel rim.

A device for dismounting a tired wheel having a wheel rim and a tire mounted on the wheel rim, comprising:

• a support member,
• a bill or lever-shaped disassembling tool having one end thereof articulated to said support member, and the other work end thereof substantially hook-shaped, whereby said dismounting tool can be angularly displaced between a first insertion position between the tire bead of the tire and edge of the wheel rim and a second engagement and extraction position of the tire bead,
• comprising an interception element for holding said tool in an engagement and extraction position wherein the interception element is carried either by said support member or by said disassembling tool and arranged to intercept said tool or said support member, respectively, when said disassembling tool reaches said engagement and extraction position, said interception element comprising an elastically loaded pin,
• comprising returning means or articulation or pivoting means between said articulation end and said support member, designed to allow angular displacements of said disassembling tool with respect to said support member between said insertion position and said engagement and extraction position due to the reaction force of a wheel rim and/or the tire onto the work end,
• wherein said returning means comprises an elastically loading component designed to cause the disassembling tool to return to its insertion position, and
• comprising a bush element connected to the proximal end of said tool and delimiting an axial light alignable with respective holes formed in said support member, and in which an articulation pin can be inserted and locked.