Closure for pressurized containers
OwnerThurston Toeppeninventor
Life of this patent
Estimating the term…
Abstract
A screw-type linerless closure molded of resilient plastic is provided with a combination of sealing structures directed toward the particular characteristics of glass containers as used for pressurized beverages, though it may also be used for other containers. Novel means for accomodating large dimensional tolerances and special surface conditions are used, along with prior art constructions, to secure improved sealing under a wide variety of conditions.
Claims9
A closure device molded of resilient material, in combination with a container having an external screw thread about an opening and a rim perpendicular to said thread, comprising:
- a circular crown disc, a cylindrical sidewall or skirt depending from said crown disc and perpendicular to it, an internal screw thread within said sidewall to mate with said external screw thread, and multiple sealing means integral with the inside surface of said crown disc for cooperation with the upper rim and adjacent inside rim of the opening of said container, said multiple sealing means comprising:
- a first sealing means in the form of a circular ridge dependent from said crown disc and having a diameter substantially equal to the mean diameter of said upper rim, said ridge having at least one concentric groove immediately adjacent thereto;
- a second sealing means in the form of an outwardly flaring frusto-conical flexible flange supported by a concentric attachment to said crown disc and having an outer rim diameter substantially larger than the diameter of said first sealing means, said flange being engageable by said circular ridge to move said flange into intimate contact with a portion of said rim axially opposed to said ridge.
A closure device molded of resilient material, for use with a container having an external screw thread about an opening and a rim perpendicular to said thread, comprising:
- a circular crown disc, a cylindrical sidewall or skirt depending from said crown disc and perpendicular to it, an internal screw thread within said sidewall to mate with said external screw thread, and multiple sealing means integral with the inside surface of said crown disc for cooperation with the upper rim and adjacent inside rim of the opening of said container, said multiple sealing means comprising:
- a first sealing means in the form of a circular ridge dependent from said crown disc and having a diameter substantially equal to the mean diameter of said upper rim;
- a second sealing means in the form of an outwardly-flaring frusto-conical flexible flange supported by a concentric attachment to said crown disc and having an outer rim diameter substantially larger than the diameter of said first sealing means, said flange being engageable by said circular ridge to move said flange into intimate contact with a portion of said rim axially opposed to said ridge;
- said first sealing means consisting of said circular ridge and a pair of circular grooves directly inside and outside of it, the combined volume of said grooves above the adjacent lower surface of said crown disc being sufficient to accommodate the material of said ridge upon deflection of the ridge into said grooves, said ridge volume being so related to the resilience of said material that when subjected to a normal axial working load said ridge will be substantially or entirely deflected into said grooves.
A closure device molded of resilient material, for use with a container having an external screw thread about an opening and a rim perpendicular to said thread, comprising:
- a circular crown disc, a cylindrical sidewall or skirt depending from said crown disc and perpendicular to it, an internal screw thread within said sidewall to mate with said external screw thread, and multiple sealing means integral with the inside surface of said crown disc for cooperation with the upper rim and adjacent inside rim of the opening of said container, said multiple sealing means comprising:
- a first sealing means in the form of a circular ridge dependent from said crown disc and having a diameter substantially equal to the mean diameter of said upper rim;
- a second sealing means in the form of an outwardly-flaring frusto-conical flexible flange supported by a concentric attachment to said crown disc and having an outer rim diameter substantially larger than the diameter of said first sealing means, said flange being engageable by said circular ridge to move said flange into intimate contact with a portion of said rim axially opposed to said ridge;
- said first sealing means consisting of said circular ridge and a single circular groove directly adjacent to it, said ridge being asymmetrical and having its crest close to said groove, the volume of said groove above the adjacent lower surface of said crown disc being sufficient to accommodate the material of said ridge upon deflection of the ridge into said groove, and the volume of said ridge being so related to the resilience of said material that when subjected to a normal axial working load said ridge will be substantially or entirely defelected into said groove.
Dependencies are inferred from the claim text.