초록 ▼

A container neck and child-resistant closure for the neck are disclosed. The closure includes an inner part and an outer part, and castellations on the parts which mate when the outer part is displaced axially, to lock the parts together for rotation. A ratchet mechanism including ratchet ramps and

A container neck and child-resistant closure for the neck are disclosed. The closure includes an inner part and an outer part, and castellations on the parts which mate when the outer part is displaced axially, to lock the parts together for rotation. A ratchet mechanism including ratchet ramps and cantilever leaf springs biases the inner and outer parts axially and rotationally apart, and allows relative rotation of the parts in one direction of rotation, when the castellations are not engaged. The angle through which outer part has to be turned to enable the castellations to be engaged may be less than 45°and preferably less than 25°. The closure may be moved between fully opened and closed positions by rotation through less than 360°and preferably about 90°. A tamper-evident ring, and a retaining means for retaining the closure in the closed position, may also be provided.

대표청구항 ▼

A child resistant container closure assembly comprising: a container neck and a container closure; said container neck carrying a first screw thread and said container neck further carrying a first locking element; said container closure comprising: an inner part and an outer part; said inner part c

A child resistant container closure assembly comprising: a container neck and a container closure; said container neck carrying a first screw thread and said container neck further carrying a first locking element; said container closure comprising: an inner part and an outer part; said inner part carrying a second screw thread for screw threaded engagement with said first screw thread of said container neck; co-operating retaining projections on the inner and outer parts for retaining the inner part within the outer part, and for permitting limited axial movement of the inner part within the outer part; a first set of castellations on the inner part; a second set of castellations on the outer part arranged to inter-engage the first set of castellations on the inner part when the outer part is moved axially towards the inner part to permit full torque to be applied to the inner part; a set of resilient blades extending from a first of the inner and outer parts, said resilient blades bearing against said second of said inner and outer parts to urge said outer part axially in a direction away from said inner part such that said first and second sets of castellations are normally held out of inter-engagement; each of said resilient blades having a remote end and comprising an abutment surface at said remote end; said second of said inner and outer parts comprising a set of adjacent ratchet projections, each of said ratchet projections comprising a stop surface and a ramp surface, said stop surface being substantially radial and being constructed and arranged to engage the abutment surface of one of said resilient blades when the outer part is rotated in a first direction to apply the closure to said neck, thereby to permit full torque to be applied to said inner part in said first direction of rotation; each said ramp surface being constructed and arranged to cam one of the resilient blades over said ratchet projections when the outer closure part is rotated in a second direction opposite to said first direction so that said blades can slip relative to the ratchet projections if said outer part is rotated in said second direction without the first and second sets of castellations being in inter-engagement, said resilient blades transmitting only a limited torque to said ratchet projections owing to frictional engagement of said resilient blades slipping over said ramp surfaces of said ratchet projections; further comprising a second locking element on said inner part for engaging said first locking element of said container neck when said container closure is screwed into a closed position on said neck to hold said container closure in said closed position; said first and second locking elements are disengaged from one another at said closed position by (1) moving said outer part axially towards the inner part so that said first and second sets of castellations inter-engage one another and (2) then screwing said closure in said second direction, wherein said first and second locking elements are constructed and arranged to resist loosening of said container closure from the closed position until a predetermined release torque is applied to said inner part in said second direction, which predetermined release torque is greater than said limited frictional torque of said resilient blades and said ratchet projections when said outer part is rotated in said second direction without said first and second sets of castellations being inter-engaged.