Bottles and jars – Closures – Receptacle interior communicable with exterior with closure...
Patent
1987-01-12
1988-04-19
Norton, Donald F.
Bottles and jars
Closures
Receptacle interior communicable with exterior with closure...
B65D 5116
Patent
active
047383704
ABSTRACT:
A male core designed to be mateable with a female mold for forming vent slots in a thermoplastic closure. The male core comprises a cylindrical member having an end surface which forms an underside top surface and an inside surface of a downwardly depending skirt on the closure. A helical groove is formed about the periphery of the cylindrical member which forms a thread on the inside surface of the skirt. At least one integral rib is formed in the cylindrical member which is arranged parallel to the longitudinal axis of the closure. The rib forms a vent slot in the closure which traverses the thread. Convoluted surfaces are formed on the cylindrical member which extend from each side surface of the rib to the bottom of adjacent helical grooves. The convoluted surfaces provide smooth radii on the ends of the threads adjacent to the vent slot which facilitate axial stripping of the closure from the male core without deforming the threads into the vent slot. This enhances the passage of pressurized gas through the vent slot to the atmosphere as the closure is removed from a container.
REFERENCES:
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patent: 4369889 (1983-01-01), Ostrowsky
patent: 4392055 (1983-07-01), Whitney
patent: 4427126 (1984-01-01), Ostrowsky
Pohlenz Elmer E.
Urmston Hugh C.
Connelly Thomas J.
Norton Donald F.
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