Screw cap with inner and outer covers

Details Screw cap with inner and outer covers Screw cap with inner and outer covers

1982-11-18

1984-09-25

Norton, Donald F.

Bottles and jars

Closures

Frangible member or portion

215276, 215277, 215350, B65D 4104

Patent

active

044731639

ABSTRACT:
The screwcap comprises an inner cap and an outer cap. The outer cap is threaded on a container neck. The screwing action presses the inner cap and its sealing layer in an axial direction against the opening edge. An outer edge portion of the inner cap projects radially over the neck and is at a first distance over a projection on the inside of the outer cap collar. The projection only contacts the outer edge portion of the inner cap when the outer cap is unthreaded. Continued unthreading movement initially only raises the inner cap from the opening edge at a locally defined peripheral point through engagement of the projection on the lower edge of the inner cap outer edge portion, prior to complete raising of the inner cap, to eliminate a vacuum in the container. This reduces the force necessary for opening the screwcap.

REFERENCES:
patent: 3006493 (1961-10-01), Acton
patent: 3445023 (1969-05-01), Giessler et al.
patent: 4093094 (1978-06-01), Smalley et al.
patent: 4109815 (1978-08-01), Collins

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