Safety closure for a container comprising a closure lower member

Details Safety closure for a container comprising a closure lower member Safety closure for a container comprising a closure lower member

1996-12-09

1999-03-23

Cronin, Stephen K.

Dispensing

With lock or fastening seal

Inhibiting operation of flow controller or closure

215204, 215211, 215213, 215216, 215217, 215221, 215334, 220281, 2225419, B67D 533

Patent

active

058848150

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a closure for a container with a closure lower member and a screw cap in which the closure lower member is connectable by a base member to the container aperture and includes a pouring spout which is connected to the base member. The screw cap has a cap bottom and a cap side wall with an internal thread that is adapted to be screwed onto and unscrewed from the pouring spout which has an external thread. The cap side wall of the screw cap in the region of its free end face terminates in at least one latching lug, the latching lugs of the screw cap co-operating with latching projections of the closure member to form a latch connection. In a screwing on direction a shallowly rising flank merges into a steep latching flank and forms the latching connection with the latching lugs, the connection being reversible by displacement of the latching lugs relative to the latching projections.
2. Description of Prior Art
A conventional closure is known from German Patent Reference DE 42 09 784 A1. In this known closure the latching connection is formed between the screw cap and the bellows. For that purpose the end face of the cap walls has circumferential latching recesses into which latching projections molded onto the bellows of the closure lower member engage. In order to undo the latching connection the bellows must be compressed so that the latching projections are radially deflected inwardly and are disengaged from the latching rebates in the cap side wall. This deflection of the bellows requires considerable application of force, particularly in the case of a strong closure for large containers.
A need exists for latching connections in a closure of the type referred to above, that can be opened easily without, however, losing its function as a child protection means.


SUMMARY OF THE INVENTION

This invention provides a closure as set out above, wherein at the closure lower member an annular flange is molded on, which projects towards the cap side wall, overlapping the latching lugs at least partly, and wherein the annular flange carries latching projections on the inside which faces the latching lugs.
The latching lugs can be pressed inwardly outside of the annular flange, such that the latch connection with the latching projection on the inside of the annular flange is undone. Accordingly, the latching lugs of the screw cap can pass the latching flanks of the latching projections, that is the screw cap can be unscrewed from the pouring spout. The positions of the latching lugs are easily detected so that adults experience no difficulties in canceling the child protection function. Due to the additional annular flange on the closure lower member the function of the bellows is not interfered with as is the case with the known closure, where the latching projections are on the bellows.
In one preferred embodiment of this invention, a resilient annular flange may be provided. The annular flange can be deformed to an oval shape by compression. This results in a cancellation of the latching connection to release the screw cap.
According to another preferred embodiment of this invention, the annular flange comprises tooth formations including multiple successively arranged latching projections. The latching projections follow each other equidistantly and the latching lugs have one or more co-acting latching elements which enter into the latching connection with the latching projections.
In another preferred embodiment of this invention, the cap side wall has two latching lugs diametrically opposed and each latching lug is associated with a latching projection on the closure member. By compression of the lower region of the cap side wall both latching connections are canceled simultaneously if pressure points on the screw cap are at the latching lugs. The screw cap when gripped and compressed may then simultaneously also be unscrewed off the pouring spout.
The application of the annular flange to the closure lower member is preferably d

REFERENCES:
patent: 3623622 (1971-11-01), Sullivan
patent: 3939788 (1976-02-01), Schneible
patent: 4098418 (1978-07-01), Fields
patent: 4413743 (1983-11-01), Summers
patent: 4444326 (1984-04-01), Musel
patent: 5078288 (1992-01-01), Fuchs
patent: 5230433 (1993-07-01), Hamilton
patent: 5238130 (1993-08-01), Marques et al.
patent: 5526947 (1996-06-01), Stolz
patent: 5566864 (1996-10-01), Stolz
patent: 5685445 (1997-11-01), Dobbs

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