Ratchets for bottle necks

Details Ratchets for bottle necks Ratchets for bottle necks

1998-06-03

2000-04-04

Shoap, Allan N.

Bottles and jars

Neck

Structure to receive a particular closure

215252, B65D 728

Patent

active

060449926

ABSTRACT:
Bottle necks for screw-off caps are provided with external threads to mesh with internal cap threads and external ratchet teeth to engage internal cap ratchet teeth. When the neck is formed of a rigid material (e.g., PET), the sharp corners of the intersecting flanks of the teeth are hazardous. To reduce the chance of injury, in accordance with this invention the corners are rounded off in a radius having its center offset from the intersection of the working flank of the tooth and the minor ratchet diameter without detrimentally reducing the length of the working flanks. Ratchet teeth are usually located in one of two diametrically disposed quadrants. The first or transition tooth of each quadrant has a greater radius than that of subsequent teeth and its center is inset toward the neck axis. In advance of the first or transition tooth is a protective "tooth" which is rounded and has no working flank, which tends to deflect the fingers of the user away from the subsequent teeth, for reducing the chance of injury.

REFERENCES:
patent: 4830207 (1989-05-01), Battegazzore
patent: 5115932 (1992-05-01), Schneider

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