Closures for containers

A container closure molded from plastics material and comprising a top, an annular skirt depending from the top and formed with a screw-thread on its internal surface, a tamper-evident ring, a circumferential line of weakening between the ring and the skirt and connecting the ring to the end of the skirt remote from the top, and a series of radially inwardly projection protrusions on the radially inner surface of the ring each having an end surface generally facing the top but inclined radially inwardly, the ring extending continuously between each adjoining pair of protrusions, so that outward deflection of the protrusions reduces a hoop stress in the ring, and the ring having an annular groove formed in one of its radially facing surfaces at a location axially between the protrusions and the bridges.

A container closure molded from plastics material and comprising a top, an annular skirt depending from the top and formed with a screw-thread on its internal surface, a tamper-evident ring, extending continuously both axially and circumferentially from the point of connection of the bridges thereto to the free edge of the ring remote from the top, a series of frangible bridges extending across an axial gap between the ring and the skirt and connecting the ring to the end of the skirt remote from the top, and a series of radially inwardly projecting protrusions on the radially inner surface of the ring each having an end surface generally facing the top but inclined radially inwardly, and the ring having an annular groove formed in one of its radially facing surfaces at a location axially between the protrusions and the bridges and spaced axially away from the bridges.

A container closure molded from plastics material and comprising a top, an annular skirt depending from the top and formed with a screw-thread on its internal surface, a tamper-evident ring extending continuously both axially and circumferentially from the point of connection of the bridges thereto to the free edge of the ring remote from the top, a circumferential line of weakening between the ring and the skirt and connecting the ring to the end of the skirt remote from the top, and a series of radially inwardly projecting protrusions on the radially inner surface of the ring each having an end surface generally facing the top but inclined radially inwardly, and the ring having an annular groove formed in one of its radially facing surfaces at a location axially between the protrusions and the bridges and spaced axially away from the bridges.

A container closure molded from plastics material and comprising a top, an annular skirt depending from the top and formed with a screw-thread on its internal surface, a tamper-evident ring extending continuously both axially and circumferentially from the point of connection of the bridges thereto to the free edge of the ring remote from the top, a series of frangible bridges extending across an axial gap between the ring and the skirt and connecting the ring to the end of the skirt remote from the top, and a series of radially inwardly projecting protrusions on the radially inner surface of the ring each having an end surface generally facing the top but inclined radially inwardly, outward deflection of the protrusions being resisted by the parts of the ring between the protrusions and adjoining said free edge, and the ring having an annular groove formed in one of its radially facing surfaces at a location axially between the protrusions and the bridges and spaced axially away from the bridges.

A container closure molded from plastics material and comprising a top, an annular skirt depending from the top and formed with a screw-thread on its internal surface, a tamper-evident ring extending continuously both axially and circumferentially from the point of connection of the bridges thereto to the free edge of the ring remote from the top, a circumferential line of weakening between the ring and the skirt and connecting the ring to the end of the skirt remote from the top, and a series of radially inwardly projection protrusions on the radially inner surface of the ring each having an end surface generally facing the top but inclined radially inwardly, outward deflection of the protrusions being resisted by the parts of the ring between the protrusions and adjoining said free edge, and the ring having an annular groove formed in one of its radially facing surfaces at a location axially between the protrusions and the bridges and spaced axially away from the bridges.