Method of making a tire by first molding a tread and then molding separate sidewalls onto the tread
AssigneeDunlop Limited
InventorAnthony Gerald Goodfellow
Life of this patent
Estimating the term…
Abstract
A pneumatic tire is moulded using a mould core of cured rubber the radial sectional shape of which is the same as the internal radial sectional configuration of the finished tire. The opposite sides of the core are supported by fitting plates while a tread portion of tire is moulded onto the exposed outer periphery of the core. Thereafter the side plates are removed in turn and replaced by sidewall mould halves enabling sidewalls to be moulded against the core in contact with the tread portion.
Claims7
A method for the manufacture of a pneumatic tire comprising initially moulding the tread portion of the tire from uncured rubber in an annular mould cavity the radially inner surface of the cavity being a surface of a solid mould core of cured rubber and the radially outer surface of the cavity being a surface of a tread ring mould, the mould core having substantially the shape of the interior of the tire to be moulded, and being supported during moulding of the tread portion by rigid side plates which engage sidewall moulding surfaces of the core, removing said side plates after moulding said tread portion, leaving said tread portion in place between said core and said tread ring mould, replacing said side plates by mould halves defining sidewall moulding cavities against the sidewall moulding surfaces of the core, forcing uncured rubber into the sidewall moulding cavities to mould said sidewalls onto the tread portion, and curing said rubber of said tread portion and said sidewalls.
A method of manufacturing a pneumatic tire comprising:
- initially molding a tread portion of the tire from uncured rubber in an annular mold cavity, the radially outer surface of which is defined by a surface of a tread ring mold and the radially inner surface of which is defined by a surface of a solid mold core, having substantially the shape of the interior of the tire to be molded, of cured rubber which is radially inwardly compressed during molding of the tread portion,
- supporting the mold core during molding of the tread portion with rigid side plates which engage sidewall molding surfaces of the core,
- removing said side plates after molding said tread portion,
- leaving said tread portion in place between said core and said tread ring mold,
- thereafter inserting mold halves defining sidewall molding cavities with the sidewall molding surfaces of the core,
- thereafter forcing uncured rubber into the sidewall molding cavities to mold sidewalls onto the tread portion, and
- curing said rubber of said tread portion and said sidewalls.
Dependencies are inferred from the claim text.