초록 ▼

A preform injection mould includes an elongate mould core cooperating with a female mould and a neck ring in a manner to define a mould cavity therebetween. An injection nozzle in the female mould allows molten plastic to be injected into the mould cavity so that a preform moulded article may be for

A preform injection mould includes an elongate mould core cooperating with a female mould and a neck ring in a manner to define a mould cavity therebetween. An injection nozzle in the female mould allows molten plastic to be injected into the mould cavity so that a preform moulded article may be formed. The neck ring is constituted by a pair of mating halves which can be separated laterally with respect to the longitudinal axis of the mould core. A taper sleeve surrounds the mould core beneath the neck ring. The neck ring halves are secured to diametrically opposed slides to facilitate lateral separation of the neck ring. A pair of slide taper locks contact a respective one of the slides to inhibit lateral movement of the slides and to back up the neck ring when injection mould is in a mould closed position. An annular formation is formed on the upper surface of the neck ring and is accommodated by a complementary recess formed in the bottom of the female mould. The mating inclined surfaces of the female mould and the annular formation constitute an upper taper lock which is backed up by a cavity plate. An annular formation is provided on the upper surface of the taper sleeve and is accommodated by a complimentary recess formed in the bottom of the neck ring. The mating inclined surfaces of the taper sleeve and neck ring constitute a lower taper lock. Since a portion of the neck ring constitutes the female taper of the lower taper lock, the lower taper lock is backed up by the slide taper locks through the slides allowing the cross-sectional area of the neck ring to be reduced.

대표청구항 ▼

[ We claim:] [1.] A preform injection mould for forming a preform moulded article comprising:a mould core assembly;a female mould moveable axially relative to said mould core assembly;a neck ring constituted by separable neck ring parts moveable radially relative to said mould core assembly and posi

[ We claim:] [1.] A preform injection mould for forming a preform moulded article comprising:a mould core assembly;a female mould moveable axially relative to said mould core assembly;a neck ring constituted by separable neck ring parts moveable radially relative to said mould core assembly and positioned between said female mould and said mould core assembly, said female mould and neck ring surrounding a portion of said mould core assembly when said injection mould is in a mould closed condition in a manner to define a mould cavity therebetween into which molten plastic is injected to form said preform moulded article, said female mould being axially spaced from both said mould core assembly and said neck ring and said neck ring parts being separated and radially spaced from said mould core assembly when said injection mould is in a mould open condition;a first taper lock constituted by mating portions of said neck ring and said female mould when said injection mould is in said mould closed condition;a second taper lock constituted by said mating portions of said neck ring and said mould core assembly when said injection mould is in said mould closed condition, said second taper lock including a female taper defined by a portion of said neck ring and a complimentary male taper defined by said mould core assembly;slides secured to said neck ring parts and being moveable to move said neck ring parts radially;slide locks to abut said slides when said injection mould is in said mould closed condition to inhibit radial movement of said slides and to back up said second taper lock; anda drive to move said female mould axially relative to said mould core assembly and to move said slides to move radially said neck ring parts to actuate said injection mould between said mould closed and mould open conditions.