Tire building apparatus
First Claim
1. A tyre building apparatus comprising an expandable former embodying axially movable former expanding and contracting means to dispose the former in positions defining firm supporting surfaces of different radii, said expanding and contracting means ensuring symmetrical expansion and contraction of the former with respect to a transverse plane of the former, tyre bead core locating and supporting means disposed on opposite sides of said transverse plane and axially movable independently of the axial movements of said former expanding and contracting means, further means ensuring that axial movements of the two bead core locating and supporting means occur symmetrically at all times with respect to said transverse plane, axially movable, first fluid pressure-actuated means for effecting adjustment of the axial position of said tyre bead locating and supporting means independently of the degree of expansion of the former, whereby a desired tensioning of the components of a tyre mounted on the former can be achieved whilst maintaining said components symmetrically disposed on the former with respect to said transverse plane, second fluid pressure actuated means axially movable with respect to said first fluid pressure actuated means for effecting radial movement of the tyre bead core locating and supporting means from an inner position to a radially outer position which remains constant independent of the degree of expansion of the former, and adjustable stop means comprising manually adjustable, interengaged first and second screw-threaded means carried by at least one of said fluid-pressure actuated means for the purpose of providing a positive limit to the relative axial movement between said first and second fluid-pressure actuated means, whereby said radially outer position of the tyre bead core locating and supporting means may be accurately determined.
0 Assignments
0 Petitions
Accused Products
Abstract
A tire building apparatus comprising an expandible former embodying axially movable former expanding and contracting means to dispose the former in positions defining firm supporting surfaces of different radii, said expanding and contracting means ensuring symmetrical expansion and contraction of the former with respect to a transverse plane of the former. Axially-movable tire bead core locating and supporting means are disposed on opposite sides of said transverse plane. Further means, for example at least one rack and pinion mechanism connecting the two bead core locating and supporting means, is provided to ensure that axial movements of the two bead core locating and supporting means occur symmetrically with respect to said transverse plane. Fluid pressure-actuated means are provided for effecting adjustment of the axial position of said tire bead locating and supporting means independently of the degree of expansion of the former, whereby a desired tensioning of the components of a tire mounted on the former can be achieved while maintaining said components symmetrically disposed on the former with respect to said transverse plane. Means may be provided for varying the pressure of the fluid supplied to said fluid pressure-actuated means so that the tension applied to the tire components can be controlled as desired during shaping of the tire components.
16 Citations
8 Claims
- 1. A tyre building apparatus comprising an expandable former embodying axially movable former expanding and contracting means to dispose the former in positions defining firm supporting surfaces of different radii, said expanding and contracting means ensuring symmetrical expansion and contraction of the former with respect to a transverse plane of the former, tyre bead core locating and supporting means disposed on opposite sides of said transverse plane and axially movable independently of the axial movements of said former expanding and contracting means, further means ensuring that axial movements of the two bead core locating and supporting means occur symmetrically at all times with respect to said transverse plane, axially movable, first fluid pressure-actuated means for effecting adjustment of the axial position of said tyre bead locating and supporting means independently of the degree of expansion of the former, whereby a desired tensioning of the components of a tyre mounted on the former can be achieved whilst maintaining said components symmetrically disposed on the former with respect to said transverse plane, second fluid pressure actuated means axially movable with respect to said first fluid pressure actuated means for effecting radial movement of the tyre bead core locating and supporting means from an inner position to a radially outer position which remains constant independent of the degree of expansion of the former, and adjustable stop means comprising manually adjustable, interengaged first and second screw-threaded means carried by at least one of said fluid-pressure actuated means for the purpose of providing a positive limit to the relative axial movement between said first and second fluid-pressure actuated means, whereby said radially outer position of the tyre bead core locating and supporting means may be accurately determined.
- 6. A tyre building apparatus comprising an expandable former embodying axially movable former expanding and contracting means to dispose the former in positions defining firm supporting surfaces of different radii, said expanding and contracting means ensuring symmetrical expansion and contraction of the former with respect to a transverse plane of the former, tyre bead core locating and supporting means disposed on opposite sides of said transverse plane and axially movable independently of the axial movements of said former expanding and contracting means at least one rack and pinion mechanism connecting the two bead core locating and supporting means to ensure that axial movements of the two bead core locating and supporting means occurs symmetrically at all times with respect to said transverse plane, axially movable, first fluid pressure-actuated means for effecting adjustment of the axial position of said tyre bead locating and supporting means independently of the degree of expansion of the former, whereby a desired tensioning of the components of a tyre mounted on the former can be achieved whilst maintaining said components symmetrically disposed on the former with respect to said transverse plane, means for varying the pressure of the fluid supplied to said first fluid pressure-actuated means so that the tension applied to the tyre components can be controlled as desired during shaping of the tyre components, second fluid pressure-actuated means axially movable with respect to said first fluid pressure actuated means for effecting radial movement of the tyre bead core locating and supporting means from an inner position to a radially outer position, which remains constant independent of the degree of expansion of the former, and adjustable stop means comprising manually adjustable, interengaged first and second screw-threaded means carried by at least one of said fluid pressure-actuated means for the purpose of providing a positive limit to the relative axial movement between said first and second fluid pressure actuated means, whereby said radially outer position of the tyre bead core locating and supporting means may be accurately determined. tyre
Specification