Method of building a pneumatic tire and a tire building...

Details Method of building a pneumatic tire and a tire building... Method of building a pneumatic tire and a tire building...

B - Operations, Transporting

29

D

154/19

B29D 30/08 (2006.01) B29D 30/36 (2006.01)

Patent

CA 1247509

ABSTRACT An improved method and apparatus for building radial tyres which lends itself to automatic production of tyres is disclosed herein. The method of building a pneumatic tyre comprises separately building an unexpanded carcass assembly and an annular tread assembly comprising tread rubber, breaker reinforcement and sidewall rubbers, positioning the tread assembly and the carcass assembly in coaxial relationship with the unexpanded carcass disposed centrally within the tread assembly, expanding the carcass into engagement with the tread assembly and consolidating the two assemblies together. The apparatus is in the form of a building former for a tread assembly comprising an expansible central portion and a pair of expansible side portions, the central portion being arranged to expand to a greater diameter than the side portions so as to hold said side portions in a frusto- conical shape.

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