Pilfer-proof plastic closure for containers
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United States of America Patent
Stats
-
Jun 4, 1985
Grant Date -
N/A
app pub date -
Feb 21, 1984
filing date -
Jan 18, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pilfer-proof plastic closure comprising a top panel wall and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall. The skirt wall has formed therein a circumferentially extending breakable line dividing the skirt wall into a main portion above the breakable line and a pilfer-proof bottom portion below it. The main portion has formed on its inner surface an internal thread and the pilfer-proof bottom portion has formed on its inner surface a plurality of radially inwardly projecting engaging flaps at circumferentially spaced positions. Each of said engaging flaps has a first portion extending from the inner surface of the pilfer-proof bottom portion tiltedly in a direction opposite to the direction of rotation of the closure at the time of mounting it on the mouth-neck portion of a container and a second portion bent with respect to the first portion and further extending from the end of the first portion. The first portion forms an angle .alpha. smaller than 90 degrees and the second portion forms an angle .beta. larger than the angle .alpha., both with respect to the tangent of the inner surface of the pilfer-proof bottom portion at the base edge of the engaging flap.
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Cited Art Landscape
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