Bottles and jars – Closures – Including visual indicia
Patent
1987-05-08
1988-05-31
Norton, Donald F.
Bottles and jars
Closures
Including visual indicia
215271, B65D 4104
Patent
active
047474971
ABSTRACT:
A tamper detector cap which is characterized by an internally-threaded inner cap adapted to thread on the neck of a bottle, jar or other container and provided with a flexible diaphragm and spaced wall grooves located in the outer circumference thereof. An outer cap fitted with a transport window and internal, spaced retainer thread segments for threadibly engaging the wall grooves in the inner cap, is also provided. When the inner cap is threadibly attached to the neck of the container and a vacuum is created in the container, the diaphragm is depressed inwardly and the outer cap is threadibly secured to the inner cap by means of the retainer thread segments and cooperating wall grooves, such that the outer cap is sealed on the inner cap. Application of a counterclockwise torque to the outer cap first loosens the outer cap on the inner cap and then loosens the inner cap and breaks the seal between the inner cap and the threaded neck of the container, causing the diaphragm to assume a neutral position. Alternatively, a positive external pressure can be applied to the container, either before or after the inner cap is threadibly attached to the container neck, in order to deflect the diaphragm inwardly and the outer cap is sealed on the inner cap by operation of the retainer thread segments and wall grooves. When the outer cap is loosened with respect to the inner cap, the seal between the top of the outer cap and the diaphragm is broken and the diaphragm assumes a neutral position adjacent the top of the inner cap, to indicate tampering.
REFERENCES:
patent: 2040798 (1936-05-01), Schoonmaker
patent: 3189210 (1965-06-01), Heisler
patent: 4616761 (1986-10-01), Nolan
patent: 4673096 (1987-06-01), Town et al.
Harrison John M.
Norton Donald F.
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