Dispensing – Slitted resilient diaphragm or nipple
Patent
1998-04-16
2000-08-01
Kaufman, Joseph A.
Dispensing
Slitted resilient diaphragm or nipple
222212, 222493, 222494, B65D 2540
Patent
active
060953810
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a self-closing closure with a closure cap, with a through-passage opening formed in the closure cap, and with a closure membrane, assigned to the through-passage opening.
Such closures have already been disclosed in various configurations. During usage of these closures, however, disadvantages have presented themselves to the effect that either the closure has not been sufficiently reliable or the necessary ventilation requires such a negative pressure that, in the case of conventional squeezable bottles which are provided with a closure, for example, the negative pressure formed is not sufficient or the recovery forces in the squeezable bottle have to be so pronounced that they are not really suitable for conventional usage.
Taking the previously described prior art as a basis, the invention is concerned with the technical problem of specifying a self-closing closure which is easier to use. The aim is also to achieve a closure which is favorable in terms of production. Furthermore, it is also endeavoured to render installation as favorable as possible. The invention is also concerned with the technical problem of specifying a closure membrane which is advantageous for said closure.
SUMMARY OF THE PRESENT INVENTION
The technical problem is solved first and foremost based on the fact that, in the non-actuated installed state, the closure membrane has a bottom retaining border and a top, essentially concave closure head, the closure head and the retaining border, furthermore, being connected by a connecting wall. It is also preferred for the installed state of the closure membrane to be achieved by turning the closure membrane inside out after it has been produced by injection moulding. This produces favorable force effects. In particular, on the one hand, the concave closure head is advantageously prestressed into its closed state by radially acting forces of the inside-out connecting wall. On the other hand, however, rapid opening, in particular for ventilating purposes, during sucking back, should also be noted. Furthermore, starting from a border-side attachment to the closure head, the connecting wall may preferably continue into a constriction beneath a projection area of the closure head, this observation once again being based on the installed state. As is explained in more detail below, this is achieved, in particular, in that, in the production state (injection-moulded state), the connecting wall extends essentially cylindrically, starting from the closure head. Depending on the desired properties of the closure membrane, however, there may also be a variation here in terms of a conical configuration. Continuation into a constriction beneath the projection area of the closure head produces something of a goblet-like configuration of the closure membrane as a whole in this region. Furthermore, there are also applications in which, even in the installed state, the connecting wall adjoins the bottom of the closure head in an essentially cylindrically extending manner, in particular when the abovementioned operation of turning the closure membrane inside out after production is not carried out. Specifically, it is advantageous, in particular with respect to the abovedescribed inside-out, installed state, if the border side of the closure head is of a greater thickness than the boundary wall. The closure head may taper inwards continuously, starting from its border region. The boundary wall is attached to a top region of the border edge, as seen in cross-section, of the closure head of the closure membrane--this observation once again being based on the installed state--and the boundary wall grips over a bottom, free border region of the boundary edge of the closure head. As a result of the abovedescribed, advantageously set compressive forces directed towards a center point of the closure head, this being achieved by a certain enforced widening of the elastic material of the closure membrane, in particular of the connecting wall, a radially inwar
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Kaufman Joseph A.
Zeller Plastik GmbH
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