Screw-top closure with a tamper-evident strip

Details Screw-top closure with a tamper-evident strip Screw-top closure with a tamper-evident strip

B - Operations, Transporting

65

D

B65D 41/34 (2006.01) B29C 45/44 (2006.01)

Patent

CA 2151923

A closure device for a container (19) with a flange (22), including a threaded cap (2) with a tamper-proof ring (3) extending from the lower portion thereof and joined thereto via a frangible portion (4, 5), said ring (3)having a deformable ring-shaped connecting strip (18) defined at its lower portion by an inner ring-shaped projection (13) with an upper surface (13a) perpendicular or substantially perpendicular to the device axis (1a), and at its upper portion by an outer ring-shaped projection (7) intermediate said inner projection (13) and said frangible portion (4, 5), said outer ring-shaped projection (7) having an upper surface (8) proximate to the cap at an acute angle (.alpha.) to the device axis (1a). Within the tamper-proof ring (3), the lower surface (13b) of the inner projection (13) that is spaced from the cap (2) is at an acute angle (.gamma.) to the device axis and, as it extends towards the free lower edge of the ring, connects with an inclined centering plane (15) at an acute angle .delta. to the device axis, said angle (.delta.) being different from that of said lower surface (13b) of the projection (13) so that when the cap is placed on the container, the ring (3) is pushed back by the flange (22) by a controlled deformation of the ring-shaped connecting strip (18), whereby the lower portion of the ring (3) is rotatably hinged.

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