Childproof closure for a container comprising a lower portion wi

Details Childproof closure for a container comprising a lower portion wi Childproof closure for a container comprising a lower portion wi

1994-11-28

1996-10-22

Kaufman, Joseph

Dispensing

With lock or fastening seal

Inhibiting operation of flow controller or closure

222528, 222529, B67D 533

Patent

active

055668640

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a closure for a container, having a lower closure member and a screw cap in which the lower closure member is adapted to be connected to the container opening by a base member. A pouring spout is connected to the base member of the lower closure member with an extendible bellows. The screw cap includes a cap bottom and a cap side wall with an internal thread and is adapted to be screwed onto and off the pouting spout which has an outer thread.
2. Description of Prior Art
In known closures at least the lower closure member is manufactured of resilient material so as to permit, by the bellows moving, the pouring spout to move from the down-pressed starting position into the extended pouring position and back again into the starting position.
In the extended pouting position of known closures the screw cap can be unscrewed from the pouring spout, as shown in German Patent Reference DE 35 36 514 A1. In this context extension ears may be moulded onto the cap bottom, and the pouring spout may be sealed by a sealing disc. Once the sealing disc has been removed even a child may unscrew the screw cap and gain access to the contents.
There exists a need to furnish a closure of the aforesaid type with a child protection feature in a simple manner.


SUMMARY OF THE INVENTION

This invention provides a closure as set forth in the opening paragraph, wherein the pouting spout of the lower closure member beyond the external thread, in that transitional region which is directed towards the bellows, carries at least one catch projection, which in the screwing-on direction comprises a gradually rising flank and merges into a steep catch flank. The cap side wall, in the final screwed-on position is in positive engagement with the catch projection and prevents unscrewing of the screw cap. By pressing inwardly the bellows in the region of the catch projection, the positive engagement between the screw cap and the pouring spout is cancelled and the screw cap can be released for being unscrewed.
With this child protection feature, the resilient deformability of the bellows is optimally utilized. The catch projection which is moulded onto the pouring spout in its transitional region to the bellows is in positive engagement with the cap side wall. By radially pressing the bellows inwardly in the region of the catch projection the positive engagement can be disengaged and the screw cap can be released for being unscrewed. This requires simultaneously two operations, which a child is unable to perform. Accordingly, the closure according to this invention is substantially childproof. Only if simultaneously the bellows are radially deformed and the screw cap is turned in the unscrewing direction, can the screw cap be unscrewed from the pouring spout.
According to an advantageous embodiment of this invention two catch projections are molded in diametrical relationship onto the pouring spout, since the bellows are gripped diametrically when being deformed.
A simple catch engagement in relation to the cap side wall is achieved in accordance with one embodiment of this invention because the cap side wall for each catch projection has at least one catch recess taking the form of an axially directed recess, in the free terminal region of the cap side wall.
If, moreover, the cap side wall has circumferentially uniformly distributed alternating catch recesses and catch tabs, the screw cap can be secured in a plurality of angular positions which is advantageous for the design of the screw cap, in order to accommodate tolerances.
In this context, the catch recesses may have a portal-like cross section and a width which corresponds to the width of the catch tabs, and the walls limiting the catch recesses can be radially directed in the cap side wall. The injection molding tool for manufacturing the screw cap can be designed more simply.
A tolerance compensation in an axial direction will be achieved if in the fully screwed-on position of the screw cap, the catch rece

REFERENCES:
patent: 3101856 (1963-08-01), Whiteman, Jr.
patent: 3613966 (1971-10-01), Summers
patent: 4422563 (1983-12-01), Babiol
patent: 4605135 (1986-08-01), Ryder
patent: 5078288 (1992-01-01), Fuchs
patent: 5445298 (1995-08-01), Strong

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