Patent ID: 7497346

Claim:
A closure assembly for a container, the assembly comprising: a neck part extending along an axis and defining an axially outwardly open outlet mouth; a cap part fittable in a closed position with the neck part to block the outlet mouth; interengaging means on the parts for retaining the cap part in the closed position and actuatable for axial outward movement of the cap part relative to the neck part into an open position unblocking the outlet mouth; an annular collar formation formed on one of the parts, flared axially inward, and having an outer edge of a predetermined large diameter; and an annular formation on the other of the parts having a flared surface flared axially inward and having an inner edge of a predetermined small diameter smaller than the large outer-edge diameter, the inner edge being axially outward of the collar outer edge in the closed position, at least one of the formations being elastically radially deformable on outward movement of the cap part from the closed position to the open position with the outer edge passing the inner edge, the formations engaging axially and preventing the cap part from moving from the open position to the closed position.