Patent ID: 11897665
Assignee: WEENER PLASTICS GROUP B.V.
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A closure to be fixed to an upper rim of a container, the closure comprising:
an annular base comprising a peripheral skirt which has an integral non-removable end portion adapted to be arranged over an upper rim of a container, and furthermore comprising a peripheral locking rim integrally formed on said end portion of the peripheral skirt, said peripheral locking rim having a proximal end and a distal end,
said proximal end of the peripheral locking rim being hingedly connected to the peripheral skirt, allowing the peripheral locking rim to be moved to a folded state, in which the peripheral locking rim is folded inwardly towards an inner surface of the end portion of the peripheral skirt,
wherein the end portion of the skirt has on the inner surface an engagement surface portion with an inner diameter and a widening surface portion having a gradually increasing inner diameter from the engagement surface portion towards an end of the peripheral skirt; and
a lid moveable relative to the annular base between a closed position, in which the lid covers an access opening, and an open position, in which the access opening is unblocked by the lid,
wherein the inner diameter of the widening surface portion increases gradually according to a curved function, and
wherein the widening surface portion adjoins the engagement surface portion in a flush manner.