초록 ▼

A linerless closure of one-piece integrally molded plastic construction includes a base wall and a cylindrical skirt for attaching the closure to a container neck finish. First and second circumferentially continuous annular walls extend from the base wall at positions radially inward from the skirt

A linerless closure of one-piece integrally molded plastic construction includes a base wall and a cylindrical skirt for attaching the closure to a container neck finish. First and second circumferentially continuous annular walls extend from the base wall at positions radially inward from the skirt. The first and second annular walls are spaced from each other to receive an end portion of the container neck finish when the closure is applied to the neck finish. At least one of the annular walls has a circumferentially continuous annular projection extending toward the opposing annular wall. The annular projection is axially flexible for bending and folding toward the base wall and toward the at least one annular wall in sealing engagement with the end portion of the container neck finish when such end portion is received between the annular walls.

대표청구항 ▼

The invention claimed is: 1. A linerless closure of one-piece integrally molded plastic construction, which includes: a base wall and a cylindrical skirt for attaching the closure to a container neck finish, said base wall having a central portion with a first thickness, a first peripheral portion

The invention claimed is: 1. A linerless closure of one-piece integrally molded plastic construction, which includes: a base wall and a cylindrical skirt for attaching the closure to a container neck finish, said base wall having a central portion with a first thickness, a first peripheral portion contiguous with said central portion and having a second thickness greater than said first thickness, and a second peripheral portion connecting said first peripheral portion and said skirt and having a third thickness greater than said second thickness, a first circumferentially continuous annular wall extending away from said base wall at a juncture of said central and first peripheral portions of said base wall, a second circumferentially continuous annular wall extending away from said base wall at a juncture of said first and second peripheral portions of said base wall, said first and second annular walls being spaced from each other to receive therebetween an end portion of the container neck finish when the closure is attached to the container neck finish, at least one of said annular walls having a circumferentially continuous annular projection extending toward the opposing annular wall, said annular projection being axially flexible with respect to said at least one annular wall for bending and folding toward said base wall and toward said at least one annular wall upon engagement with the container neck finish end portion, said at least one annular projection including an undersurface facing away from said base wall to contribute to the flexibility of said at least one annular projection to ensure that said at least one annular projection will fold into sealing engagement with an outside cylindrical surface of the container neck finish, wherein said first peripheral portion of said closure base wall has an undersurface between said first and second annular walls, and wherein said closure is sealingly engageable with the container neck finish by engagement of said closure base wall undersurface with an end surface of the container neck finish and by engagement of said at least one annular projection undersurface with an outside cylindrical surface of the container neck finish. 2. The closure set forth in claim 1 wherein both of said annular walls have circumferentially continuous annular axially flexible projections extending toward the opposing annular wall. 3. The closure set forth in claim 2 wherein said annular projections are radially opposed to each other. 4. The closure set forth in claim 3 wherein said annular projections are mirror images of each other in radial cross section. 5. The closure set forth in claim 1 wherein said first and second annular walls have ends spaced from said base wall and coplanar with each other in a plane perpendicular to a central axis of said cylindrical skirt. 6. The closure set forth in claim 1 wherein said first annular wall extends at an angle axially away from said base wall and radially toward said skirt, and wherein said second annular wall extends axially away from said base wall. 7. The closure set forth in claim 1 wherein said first annular wall extends axially away from said base wall, said first annular wall having a radially outer surface with a cylindrical surface portion adjacent to said base wall and an inwardly conical surface portion remote from said base wall, and wherein said second annular wall extends axially away from said base wall, said second annular wall having said circumferentially continuous annular projection extending radially inwardly toward said first annular wall in radially opposed alignment with said conical surface portion of said first annular wall, and said first annular wall being in plug-sealing engagement with an inside cylindrical surface of the container neck finish and said annular projection undersurface being in sealing engagement with the outside cylindrical surface of the container neck finish. 8. The closure set forth in claim 1 wherein said annular projection undersurface is flat and perpendicular to a central axis of said cylindrical skirt. 9. The closure set forth in claim 8 wherein said at least one annular projection includes a conical upper surface at an angle to said annular projection undersurface. 10. A package that includes: a container having a cylindrical neck finish with an open end, inner and outer side cylindrical surfaces adjacent to said open end, and at least one external thread segment, and a linerless closure of one-piece integrally molded plastic construction, which includes: a base wall and a cylindrical skirt with at least one internal thread segment engaged with said external thread segment and attaching said closure to said container neck finish, first and second circumferentially continuous annular walls extending from said base wall at positions radially inward from said skirt, said first and second annular walls being spaced from each other and receiving an end portion of said container neck finish, at least one of said annular walls having a circumferentially continuous annular projection engaged with a side cylindrical surface of said container neck finish and being folded toward said base wall and toward said at least one annular wall to seal said package, said annular projection including an undersurface facing away from said base wall to contribute to the flexibility of said annular projection to ensure that said annular projection will fold into sealing engagement with said container neck finish, said closure being secured to said container neck finish and said package having an internal pressure of at least ten pounds per square inch at room temperature, wherein said base wall has a flat axially facing surface extending between said first and second annular walls, from said front annular wall to said second annular wall, in opposed sealing engagement with an end surface of said container neck finish, and wherein said package is sealed by engagement of said closure base wall flat axially facing surface with said container neck finish end surface and by engagement of said annular projection undersurface with said container neck finish side cylindrical surface wherein said base wall has a central portion with a first thickness, a first peripheral portion contiguous with said central portion and having a second thickness greater than said first thickness, and a second peripheral portion between said first peripheral portion and said skirt and having a third thickness greater than said second thickness, wherein said first of said annular walls extends at an angle axially away from said base wall and radially toward said skirt at a juncture of said central and first peripheral portions of said base wall, wherein said second annular wall extends axially away from said base wall at a juncture of said first and second peripheral portions of said base wall, and wherein both of said annular walls have circumferentially continuous annular projections engaged with opposing side cylindrical surfaces of said container neck finish and being folded toward said base wall and toward said annular walls to seal said package. 11. The package set forth in claim 10 wherein said annular projection undersurface of said closure is flat and perpendicular to a central axis of said cylindrical skirt. 12. The closure set forth in claim 11 wherein said at least one annular projection includes a conical upper surface at an angle to said annular projection undersurface. 13. A package that includes: a container having a cylindrical neck finish with an open end, inner and outer side cylindrical surfaces adjacent to said open end, and at least one external thread segment, and a linerless closure of one-piece integrally molded plastic construction, which includes: a base wall and a cylindrical skirt for attaching the closure to said container neck finish, said base wall having a central portion with a first thickness, a first peripheral portion contiguous with said central portion and having a second thickness greater than said first thickness, and a second peripheral portion connecting said first peripheral portion and said skirt and having a third thickness greater than said second thickness, a first circumferentially continuous annular wall extending away from said base wall at a juncture of said central and first peripheral portions of said base wall, a second circumferentially continuous annular wall extending away from said base wall at a juncture of said first and second peripheral portions of said base wall, said first and second annular walls being spaced from each other to receive an end portion of said container neck finish when the closure is attached to said container neck finish, at least one of said annular walls having a circumferentially continuous annular projection extending toward the opposing annular wall, said annular projection being engaged with an opposing one of said side cylindrical surfaces of said container neck finish and folded toward said base wall and toward said at least one annular wall to seal said package, said annular projection including an undersurface facing away from said base wall to contribute to the flexibility of said annular projection to ensure that said annular projection will fold into sealing engagement with said container neck finish, said first peripheral portion of said closure base wall having an undersurface between said first and second annular walls, and wherein said package is sealed by engagement of said closure base wall undersurface with an end surface of said container neck finish and by engagement of said annular projection undersurface with said opposing side cylindrical surface. 14. The package set forth in claim 13 wherein said base wall undersurface has a flat axially facing surface extending between said first and second annular walls, from said first annular wall to said second annular wall, in opposed sealing engagement with said end surface of said container neck finish. 15. The package set forth in claim 13 wherein said first of said annular walls extends at an angle axially away from said base wall and radially toward said skirt at a juncture of said central and first peripheral portions of said base wall, wherein said second annular wall extends axially away from said base wall at a juncture of said first and second peripheral portions of said base wall, and wherein both of said annular walls have circumferentially continuous annular projections engaged with opposing side cylindrical surfaces of said container neck finish and being folded toward said base wall and toward said annular walls to seal said package. 16. The package set forth in claim 13 wherein said first annular wall extends axially away from said base wall at a juncture of said central and first peripheral portions of said base wall, said first annular wall having a radially outer surface with a cylindrical surface portion adjacent to said base wall and an inwardly conical surface portion remote from said base wall, wherein said second annular wall extends axially away from said base wall at a juncture of said first and second peripheral portions of said base wall, said second annular wall having said circumferentially continuous annular projection extending radially inwardly toward said first annular wall in radially opposed alignment with said conical surface portion of said first annular wall, said annular projection being axially flexible and being bent and folded toward said base wall and toward said second annular wall by engagement with said end portion of said container neck finish, and said first annular wall being in plug-sealing engagement with an inside cylindrical surface of said container neck finish and said annular projection undersurface being in sealing engagement with an outside cylindrical surface of said container neck finish. 17. The package set forth in claim 13 wherein said annular projection undersurface of said closure is flat and perpendicular to a central axis of said cylindrical skirt. 18. The closure set forth in claim 17 wherein said at least one annular projection includes a conical upper surface at an angle to said annular projection undersurface. 19. A package that includes: a container having a cylindrical neck finish with an open end, inner and outer side cylindrical surfaces adjacent to said open end, and at least one external thread segment, and a linerless closure of one-piece integrally molded plastic construction, which includes: a base wall and a cylindrical skirt with at least one internal thread segment engaged with said external thread segment and attaching said closure to said container neck finish, first and second circumferentially continuous annular walls extending from said base wall at positions radially inward from said skirt, said first and second annular walls being spaced from each other and receiving an end portion of said container neck finish, at least one of said annular walls having a circumferentially continuous annular projection engaged with a side cylindrical surface of said container neck finish and being folded toward said base wall and toward said at least one annular wall to seal said package, said annular projection including an undersurface facing away from said base wall to contribute to the flexibility of said annular projection to ensure that said annular projection will fold into sealing engagement with said container neck finish, said closure being secured to said container neck finish and said package having an internal pressure of at least ten pounds per square inch at room temperature, wherein said base wall has a flat axially facing surface extending between said first and second annular walls, from said front annular wall to said second annular wall, in opposed sealing engagement with an end surface of said container neck finish, wherein said package is sealed by engagement of said closure base wall flat axially facing surface with said container neck finish end surface and by engagement of said annular projection undersurface with said container neck finish side cylindrical surface, wherein said base wall has a central portion with a first thickness, a first peripheral portion contiguous with said central portion and having a second thickness greater than said first thickness, and a second peripheral portion between said first peripheral portion and said skirt and having a third thickness greater than said second thickness, wherein said first annular wall extends axially away from said base wall at a juncture of said central and first peripheral portions of said base wall, said first annular wall having a radially outer surface with a cylindrical surface portion adjacent to said base wall and an inwardly conical surface portion remote from said base wall, wherein said second annular wall extends axially away from said base wall at a juncture of said first and second peripheral portions of said base wall, said second annular wall having said circumferentially continuous annular projection extending radially inwardly toward said first annular wall in radially opposed alignment with said conical surface portion of said first annular wall, said annular projection being axially flexible and being bent and folded toward said base wall and toward said second annular wall by engagement with said end portion of said container neck finish, and said first annular wall being in plug-sealing engagement with an inside cylindrical surface of said container neck finish and said annular projection being in sealing engagement with an outside cylindrical surface of said container neck finish.