Stopper for a bottle, litre bottle, flask, etc..., this stopper always remaining attached to the neck during use

摘要

The present invention relates to a stopper which makes it possible to empty the bottle, flask, etc... while remaining attached to the latter; its principle consists in retaining it in the neck by the system of the spring created by folding the tongue which can be made of any existing material which would keep it in the neck. <IMAGE>