Tamper resistant container lid

Abstract

A tamper resistant container lid that provides a tear away strip that cannot be easily removed without evidence of tampering. The tear away strip is comprised of a plurality of tabs joined by integral thin film links that are heat contractible. With the lid mounted on a container and the tear strip folded or pressed down beneath the rim of the container heat applied to the strip will contract or collapse the thin film links securing the lid on the container. The thin film .links are a secure method of providing evidence of tampering because the tear strip is nearly impossible to remove without rupturing one or more of these links. A second embodiment of the invention includes a latching mechanism to hold the tear strip in a closed or folded down position beneath the rim of a container while the thin film links are heated to secure the tear strip around the container. A molding apparatus and method is also described for manufacturing parts that require mold undercuts such as the latter tamper resistant lid. A spring biased stripper ring first pivots the portion of a part having indentations requiring undercuts away from the mold to release the undercut portion before ejecting the part from the mold.

Dependencies are inferred from the claim text.