Device for demounting a tired wheel as well as a machine including such device

A method for demounting a first bead of a tire from a wheel rim of a tired wheel, comprising the following steps:

• arranging a device for demounting a tired wheel comprising:
• at least one base structure,
• at least one support arm connected to said at least one base structure so as to be angularly displaceable with respect thereto,
• actuation means for actuating said at least one support arm and configured to angularly displace said at least one support arm with respect to said at least one base structure,
• a demounting tool connected to said at least one support arm so as to be angularly displaceable with respect thereto, so that by actuating said actuation means said at least one support arm is angularly displaced, thereby causing the insertion or removal of said demounting tool between said tire and said wheel rim of said tired wheel and thus the angular displacement of said demounting tool with respect to said at least one support arm by the force of reaction imparted thereto by said wheel rim and/or by said tire,
• locking in position said tired wheel to be demounted on support means,
• locating said demounting tool at an outer circumferential area of said tired wheel at which area the tire and the wheel rim are in contact with one another,
• controlling said actuation means so as to angularly displace said at least one support arm from a first operating position to a second operating position, thereby introducing said demounting tool between the tire and the wheel rim, thus determining an angular displacement of said demounting tool with respect to said at least one support arm by the force of reaction imparted thereto by said wheel rim and/or by said tire, until said demounting tool grasps a portion of the first bead of the tire through a free end thereof;
• backwardly controlling said actuation means, so as to bring said at least one support arm in said first operating position back and said demounting tool with the grasped portion of said first bead beyond a first edge of the wheel rim or outside an area between the first edge and a second edge of the wheel rim;
• and
• rotating said tired wheel or said demounting tool, so as to complete the demounting of the first bead of said tire.