초록 ▼

A tamper-evident, snap-on, screw-off closure is used with a specially shaped container neck. The neck has at least one first helical thread on an upper neck stretch portion, and at least one external ratchet tooth on a locking wall portion below the upper neck stretch portion. The closure has an upp

A tamper-evident, snap-on, screw-off closure is used with a specially shaped container neck. The neck has at least one first helical thread on an upper neck stretch portion, and at least one external ratchet tooth on a locking wall portion below the upper neck stretch portion. The closure has an upper skirt having at least one second helical thread mating with the first helical thread of the neck. A downward extending lower skirt portion includes an outer skirt portion and a shoulder extending inwardly from said outer skirt portion. A frangible section interconnects the shoulder and the upper skirt portion. At least one substantially vertical fin is formed upstanding from the shoulder, preventing upward deformation of the lower skirt portion without breaking the frangible section. The lower skirt portion has at least one internal ratchet tooth, and is formed with a line of weakness extending through the outer skirt portion and the shoulder. The lower skirt has a tear tab which, when pulled, fractures the lower skirt on a vertical line. Continued pulling on the tab sequentially fractures the frangible section.

대표청구항 ▼

In combination, a container neck and a container closure, said neck having an upper opening, a downward extending upper neck stretch portion below said opening, said upper neck stretch portion having an exterior, at least one first helical engagement means around said exterior of said upper neck str

In combination, a container neck and a container closure, said neck having an upper opening, a downward extending upper neck stretch portion below said opening, said upper neck stretch portion having an exterior, at least one first helical engagement means around said exterior of said upper neck stretch portion, a locking wall portion below said upper neck stretch portion, said locking wall portion comprising a lower neck stretch portion offset outwardly relative to said upper neck stretch portion and a first shoulder interconnecting said upper neck stretch portion and said lower neck stretch portion, at least one external tooth on said locking wall portion, said closure having a top, a downward extending upper skirt portion depending from said top, said upper skirt portion having an interior, at least one second helical engagement means around said interior of said upper skirt portion shaped to mate with said at least one first helical engagement means, a lower skirt portion below said upper skirt portion, frangible means interconnecting said upper skirt portion and said lower skirt portion, a line of weakness extending through said lower skirt portion, at least one internal tooth on said lower skirt portion shaped to engage said at least one external tooth to prevent unscrewing of said closure relative to said neck without breaking said frangible means, said at least one first and second helical engagement means being shaped such that when said closure is moved directly axially downward on said neck without rotation of said closure relative to said neck said at least one first and second helical engagement means slip past each other and then interengage.