Push-in closures

Abstract

A push-in easy opening closure for a can end (1) or similar container member formed with a resealable pressure releasing tab (4) closing an opening (5) in the can end (1) and integrally connected to the can end (1) at integral connection (6). The tab (4) is adapted to be bent about the integral connection (6) during the opening operation, and to avoid sheet metal fracture at the integral connection (6), the radius about which the tab (4) will bend in the region of the connection (6) is artificially increased by some convenient means. In a first embodiment (FIGS. 1 to 3), a raised dimple (7) is formed centrally of the integral connection (6). In another embodiment (FIG. 4), an elongate raised bead (8) is formed longitudinally of the anticipated line of bending of the connection (6). In a still further embodiment (FIGS. 5 to 7), an elongate raised bead (9) extends transversely of the anticipated line of bending of the connection (6) and to either side of said line. In a still further embodiment (FIG. 9), an abutment (11) is secured or formed on the inner face of the can end (1) adjacent to the anticipated line of bending about the connection (6). In each of the embodiments, the bending radius of the tab (4) about the connection (6) is substantially increased to effectively prevent fracture of the tab (4) occurring.