Closure for bottles and similar containers |
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| 申请号 | US3638821D | 申请日 | 1970-07-07 | 公开(公告)号 | US3638821A | 公开(公告)日 | 1972-02-01 |
| 申请人 | ANGELO GUALA DI PIERGIOCOMO &; | 发明人 | GUALA PIERGIACOMO; | ||||
| 摘要 | A closure for a container with an internal undercut in its neck consists in a flexible main member and rigid auxiliary member. The main member has a top flange which seats on the mouth of the container and a stopper portion in the form of an inner and an outer coaxial wall, separated by a clearance. A bulge is formed on the outer surface of the outer wall, and when the closure is fitted in place engages in the undercut. The auxiliary member has a tubular wall which extends into the clearance, with an external annular projection near its end. When the closure is in place the two annular projections are aligned, and the closure cannot be removed intact. For removal, the auxiliary member is pressed further in to force the projection on its tubular wall to pass the projection on the outer wall of the main member and allow the main member to be deformed and withdrawn. | ||||||
| 权利要求 | 1. A closure for a container having a mouth and a neck with an internal undercut, the closure comprising a main member of flexible plastics having a top flange adapted to seat on the container mouth and a stopper portion adapted to seat on the container neck, the stopper portion comprising an outer and an inner walls separated by a clearance, the outer wall being joined at its upper end to the top flange and at its lower end to the lower end of the inner wall, the outer wall having a shaped external circumferential projection adapted to engage in the undercut in the container; and an auxiliary member of rigid plastics comprising a top cover and a tubular wall connected at its upper end to the top cover and having at its lower end a shaped external circumferential projection; the tubular wall of the auxiliary member being adapted on closing of the container to extend into the clearance between the outer and inner walls of the main member to a position in which the circumferential projections on the main and auxiliary members register with one another to avoid removal of the closure; and on opening of the container to extend further into the clearance to a position in which the circumferential projection on the auxiliary member is located between the circumferential projection on the main member to permit removal of the closure. 2. The closure of claim 1 in which the top flange of the main member is formed with an upwardly open annular rebate and the top cover of the auxiliary member is surrounded by an outer ring connected to the top cover by frangible web means, the outer ring being adapted to seat in the rebate in the top flange of the main member when the closure is fitted on the container, fracture of the frangible web means being necessary to allow the tubular wall of the auxiliary member to be forced further downward into the clearance between the outer and inner walls of the main member for removal of the closure. 3. The closure of claim 1 in which the outer and inner walls of the main member are provided on their surfaces defining the clearance with longitudinal ribs to facilitate sliding of the tubular wall of the auxiliary member in the clearance. 4. The closure of claim 1 in which the inner wall of the main member is closed at its upper end by a top wall. 5. The closure of claim 1 in which the circumferential projection on the outer wall of the main member is an annular bulge. 6. The closure of claim 1 in which the circumferential projection on the tubular wall of the auxiliary member is an annular ridge having a cylindrical outer surface. 7. The closure of claim 1 in which the top flange of the main member has a milled edge surface. |
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