Abstract: A machine frame includes a pair of upstanding frame members interconnected by a pair of telescopic members which include a power cylinder for moving the upstanding members towards and away from each other. A bead breaker arm includes a pair of hooks on one end, the bottom of which pivotally engages a pin on one of the upstanding members while the other hook movably engages another pin spaced above the first pin to allow the arm to move vertically within limits defined by the hook and the opposite end of a curved surface along which the second pin engages as the arm is raised and lowered. The outer free end of the arm includes a pivotal wedge member having an upwardly curved tapered end for engaging the rim and moving between the tire bead and the rim. The other upstanding frame member includes a rim holder for limiting the rim against vertical movement.

Abstract: A T-shaped frame including a cross member and a telescopic standard is provided with a tire-supporting cradle on one of the standard portions adjacent an upstanding tire-engaging post. A hydraulic cylinder with a bead-engaging tool on its outer free end is pivotally connected to the other telescopic frame member. Adjustment means is provided for angularly positioning the cylinder relative to the horizontal for the tool to engage the bead of a tire. Casters are provided at the corners of the T-shape frame.