Closure for water bottle

Claim 2

A cap for a container of the kind having a hollow neck, an annular finish at the end of the neck, an upper external first bead on the neck, a lower external second bead on the neck and a reduced diameter portion between the beads, said cap comprising, a generally flat circular top and a generally cylindrical skirt connected to and extending downwardly from the top, both the top and the skirt being formed from a plastic material as a unitary imperforate cap having sufficient flexibility to be pressed over the beads to a fluid sealing position, and wherein the skirt includes tension ring means for engaging an area of the skirt with an annular part of the lower surface of the first bead under a high unit pressure to provide a fluid seal and to retain the cap on the container neck and wherein the tension ring means include a substantially increased wall thickness in a ring extending circumferentially in the skirt and including a downwardly curved transition area between the top and the skirt and wherein said transition area is a reduced wall thickness section which elongates in length and effects an additional seal on the curved finish at the end of the neck and beginning of the first bead when the cap is pressed into sealing position on the container neck and wherein the top has a central disc shaped diaphragm for closing the hollow interior of the bottle neck and including expansion ring means between the diaphragm and the transition area for proviDing a hinge between the diaphragm and the transition area and skirt and for permitting the expansion required during said elongation of the curved transition area.

Claim 3

The invention defined in claim 1 wherein the expansion ring means include a downwardly curved annular section having a lower convexly curved surface which projects below the lower surface of the diaphragm and the immediately adjacent lower surface of the transition area for engaging the annular finish at the end of the neck in tangential sealing contact.

Claim 4

The invention defined in claim 1 wherein the disc shaped diaphragm has substantially greater thickness than the adjacent expansion ring and transition area.

Claim 5

The invention defined in claim 1 wherein the lower edge portion of the skirt has a diameter related to the diameter of the second bead which causes the lower edge portion of the skirt to expand and to engage the second bead in sealing contact when the cap is installed.

Claim 6

A cap for a container of the kind having a hollow neck, an annular finish at the end of the neck, an upper external first bead on the neck, a lower external second bead on the neck and a reduced diameter portion between the beads, said cap comprising, a generally flat circular top and a generally cylindrical skirt connected to and extending downwardly from the top, both the top and the skirt being formed from a plastic material as a unitary imperforate cap having sufficient flexibility to be pressed over the beads to a fluid sealing position, and wherein the skirt includes tension ring means for engaging an area of the skirt with an annular part of the lower surface of the first bead under a high unit pressure to provide a fluid seal and to retain the cap on the container neck, and wherein the lower edge portion of the skirt has a diameter related to the diameter of the second bead which causes the lower edge portion of the skirt to expand and to engage the second bead in sealing contact when the cap is installed, and including a plurality of vertically extending and circumferentially spaced ribs on the outside of the skirt and connecting the lower edge portion of the skirt with the tension ring means to couple the expansion of the lower edge portion of the skirt to the tension ring means and to effectively transmit the expansion forces through the vertical wall of the cap with an overall thin wall skirt.

Claim 7

A cap for a container of the kind having a hollow neck, an annular finish at the end of the neck, an upper external first bead on the neck, a lower external second bead on the neck and a reduced diameter portion between the beads, said cap comprising, a generally flat circular top and a generally cylindrical skirt connected to and extending downwardly from the top, both the top and the skirt being formed from a plastic material as a unitary imperforate cap having sufficient flexibility to be pressed over the beads to a fluid sealing position, and wherein the skirt includes tension ring means for engaging an area of the skirt with an annular part of the lower surface of the first bead under a high unit pressure to provide a fluid seal and to retain the cap on the container neck, and wherein the lower edge portion of the skirt has a diameter related to the diameter of the second bead which causes the lower edge portion of the skirt to expand and to engage the second bead in sealing contact when the cap is installed, and including a plurality of vertically extending and circumferentially spaced ribs on the outside of the skirt and connecting the lower edge portion of the skirt with the tension ring means to couple the expansion of the lower edge portion of the skirt to the tension ring means and to effectively transmit the expansion forces through the vertical wall of the cap with an overall thin wall skirt.

Claim 8

A cap for a container of the kind having a hollow neck, an annular finish at the end of the neck, an upper external first bead on the neck, a lower external second bead on the neck and a reduced diameter portion between the beads, said cap comprising, a generally flat circular top and a generally cylindrical skirt connected to and extending downwardly from the top, both the top and the skirt being formed from a plastic material as a unitary imperforate cap having sufficient flexibility to be pressed over the beads to a fluid sealing position, and wherein the skirt includes tension ring means for engaging an area of the skirt with an annular part of the lower surface of the first bead under a high unit pressure to provide a fluid seal and to retain the cap on the container neck, and wherein the lower edge portion of the skirt has a diameter related to the diameter of the second bead which causes the lower edge portion of the skirt to expand and to engage the second bead in sealing contact when the cap is installed, and including a plurality of vertically extending and circumferentially spaced ribs on the outside of the skirt and connecting the lower edge portion of the skirt with the tension ring means to couple the expansion of the lower edge portion of the skirt to the tension ring means and to effectively transmit the expansion forces through the vertical wall of the cap with an overall thin wall skirt, and including a tab extending downwardly from between two adjacent ribs and including reduced thickness wall sections immediately adjacent said two ribs to facilitate tearing of the skirt vertically alongside saiD two ribs when the tab is pulled straight up.

Claim 9

A cap for a container of the kind having a hollow neck, an annular finish at the end of the neck, an upper external first bead on the neck, a lower external second bead on the neck and a reduced diameter portion between the beads, said cap comprising, a generally flat circular top and a generally cylindrical skirt connected to and extending downwardly from the top, both the top and the skirt being formed from a plastic material as a unitary imperforate cap having sufficient flexibility to be pressed over the beads to a fluid sealing position, and wherein the skirt includes tension ring means for engaging an area of the skirt with an annular part of the lower surface of the first bead under a high unit pressure to provide a fluid seal and to retain the cap on the container neck, and wherein the lower edge portion of the skirt has a diameter related to the diameter of the second bead which causes the lower edge portion of the skirt to expand and to engage the second bead in sealing contact when the cap is installed, and including a plurality of vertically extending and circumferentially spaced ribs on the outside of the skirt and connecting the lower edge portion of the skirt with the tension ring means to couple the expansion of the lower edge portion of the skirt to the tension ring means and to effectively transmit the expansion forces through the vertical wall of the cap with an overall thin wall skirt, and including a tab extending downwardly from between two adjacent ribs and including reduced thickness wall sections immediately adjacent said two ribs to facilitate tearing of the skirt vertically alongside saiD two ribs when the tab is pulled straight up.

Claim 10

The invention defined in claim 6 wherein the reduced wall thickness areas are formed by depressions on the outer surface of the skirt and are located just to the outside of the ribs.

Claim 11

The invention defined in claim 7 wherein the tab includes an increased thickness section which extends the full vertical distance between the lower edge of the skirt and the tension ring.

Claim 12

A cap for a container of the kind having a hollow neck, an annular finish at the end of the neck, an upper external first bead on the neck, a lower external second bead on the neck and a reduced diameter portion between the beads, said cap comprising, a generally flat circular top and a generally cylindrical skirt connected to and extending downwardly from the top, both the top and skirt being formed from a plastic material as a unitary perforate cap, a downwardly curved transition area between the top and the skirt having a reduced wall thickness section which elongates in length and effects an additional seal on the curved finish at the end of the neck and beginning of the first bead when the cap is pressed into sealing position on the container neck, and including expansion ring means between the top and the transition area for providing a hinge between the top and the and transition area and for permitting the elongation in the transition area immediately adjacent the expansion ring which is required to press the skirt over the beads to a fluid sealing position on the container neck.

Claim 13

A cap for a container of the kind having a hollow neck, an annular finish at the end of the neck, an upper external first bead on the neck, a lower external second bead on the neck and a reduced diameter portion between the beads, said cap comprising, a generally flat circular top and a generally cylindrical skirt connected to and extending downwardly from the top, both the top and skirt being formed from a plastic material as a unitary perforate cap, a downwardly curved transition area between the top and the skirt having a reduced wall thickness section which elongates in length and effects an additional seal on the curved finish at the end of the neck and beginning of the first bead when the cap is pressed into sealing position on the container neck, and including expansion ring means between the top and the transition area for providing a hinge between the top and the and transition area and for permitting the elongation in the transition area immediately adjacent the expansion ring which is required to press the skirt over the beads to a fluid sealing position on the container neck.