Device for dispensing a liquid-to-pasty product using a metering pump having a low dead volume

Abstract

A device for dispensing a liquid-to-pasty product to be placed at the open end of a rigid container and consisting of a manual metering pump for dispensing a predetermined amount of the product to be dispensed, includes a base member to be placed on the container, a push button provided with a dispensing spout capable of acting, when pumped, against an intermediate bellows comprising an opening/closing device provided at the upper end of the bellows, characterized in that the push button is combined with a cylindrical chamber directed towards the inside of the bellows and extending inside the bellows so as to form a dead volume with a predetermined value inside same and to accordingly reduce the available air volume, thereby improving the compression rate when pumped.

1 - 5 . (canceled) 
     
     
         6 . Device for dispensing a liquid-to-pasty product intended to be installed at an open end of a rigid container and constituted by a manual metering pump allowing for the dispensing of a predetermined quantity of the product comprising:
 a base member intended to be installed on the rigid container by a lower end via at least one of hooking, adhesion, clipping, and screwing,   a push button provided with a dispensing spout mounted in a telescopic manner at an upper portion of the base member and able to act in pumping in relation to the base member, counter to a retaining member constituted by an elastically deformable bellows providing a sealed link between an internal chamber of the base member, opened towards the rigid container in order to allow the passage of the product through an opening, and at an upper end, an internal chamber of the push button wherein exits a hole of the dispensing spout, associated with opening/closing means, made at the upper end of said bellows, the push button is associated with a cylindrical chamber, directed towards the interior of the bellows with which cooperates, in a sealed manner, a peripheral wall delimiting said cylindrical chamber, and the cylindrical chamber being hermetically sealed at a lower internal end and extending to the interior of the bellows in order to constitute a solid volume of predetermined value inside the bellows and reduce by as much useless dead volume, improving as such a compression rate when pumped and the effectiveness of the pump.   
     
     
         7 . Device according to  claim 6 , wherein the cylindrical chamber constituting the solid volume inside the bellows is carried out in two members, of which one is constituted by an internal extension of the push button, open at a lower end, and the other is constituted by a globally cylindrical insert, closed at a lower end portion and open at an upper end portion, with the insert being added on the lower open portion of the first member in order to comprise the solid volume. 
     
     
         8 . Device according to  claim 7 , wherein the insert has an upper portion of which an external shape and dimension correspond, to a nearby assembly clearance, to the internal shape and dimension of the lower portion of the extension of the push button whereon is added the insert. 
     
     
         9 . Device according to  claim 8 , wherein the upper end portion of the insert is delimited, on an external wall, by a peripheral shoulder whereon abuts an end edge of the lower portion of the extension. 
     
     
         10 . Device according to  claim 6 , wherein evacuation of the product is carried out by transiting in a concentric crown-shaped volume formed by the exterior wall of the cylindrical chamber and the bellows.