Pump intended to be fitted to a container

Details Pump intended to be fitted to a container Pump intended to be fitted to a container

2000-08-30

2001-10-16

Shaver, Kevin (Department: 3754)

Dispensing

With discharge assistant

With material supply container and discharge assistant with...

C222S321700, C222S341000

Reexamination Certificate

active

06302305

ABSTRACT:

The present invention relates to a pump intended to be fitted to a container, particularly a container containing a cosmetic product.
The invention is aimed more specifically at providing a new pump which is inexpensive to manufacture and operates reliably.
The pump according to the invention comprises a base part secured to the container and is characterised in that it comprises a telescopic assembly which can move axially with respect to this base part and which defines therewith a variable-volume pumping chamber, the telescopic assembly comprising at least one outer sleeve and an inner sleeve sliding in contact with and inside the former sleeve, these sleeves each comprising a dispensing passage, these dispensing passages communicating with each other when the telescopic assembly is in a dispensing configuration, to then define an outlet passage allowing the product contained in the pumping chamber to be dispensed, the said dispensing passages ceasing to communicate with each other when the telescopic assembly is in a filling configuration, the base part comprising a filling orifice via which the product contained in the container can be drawn up to fill the pumping chamber, the telescopic assembly being arranged in such a way that, on the one hand, when the outer sleeve is moved to reduce the volume of the pumping chamber, the telescopic assembly adopts its dispensing configuration and shut-off means shut off the filling orifice and, on the other hand, when the outer sleeve is moved to increase the volume of the pumping chamber, the telescopic assembly adopts its filling configuration and the shut off means cease to shut off the filling orifice.
Advantageously, the said means of shutting off the filling orifice consist of the radially innermost sleeve. As an alternative, they could comprise a valve element.
In a preferred embodiment, the telescopic assembly has just two sleeves, which means that the pump is relatively simple to manufacture.
Still in a preferred embodiment, the inner sleeve has a delivery passage opening, on the one hand, at one end, via a radial orifice situated facing the filling orifice when the inner sleeve is in a filling position and opening, on the other hand, at another end via an axial orifice, the outer sleeve being capable of shutting off the axial orifice when the outer sleeve is moved in such a way as to reduce the volume of the pumping chamber.
Still in a preferred embodiment, the outer sleeve comprises a top wall capable of shutting off the aforementioned axial orifice.
Still in a preferred embodiment, the inner sleeve can move between the top wall of the outer sleeve and a limit stop provided towards the bottom of the outer sleeve.
Still in a preferred embodiment, the friction between the inner sleeve and the base part is greater than the friction between the outer sleeve and the inner sleeve.
In one alternative form, the telescopic assembly comprises three sleeves.
In this alternative form, the radially innermost sleeve advantageously comprises, on its interior surface, a part capable of shutting off the filling orifice when this sleeve is in a shutting-off position, and a recess capable of allowing the flow of product from the filling orifice when this sleeve is in a filling position.
Still in this alternative form, the intermediate sleeve between the radially innermost sleeve and the outer sleeve can move between a dispensing position in which it rests against a top wall of the outer sleeve, and a filling position in which it rests against a limit stop provided towards the bottom of the outer sleeve.
Still in this alternative form, the friction between the outer sleeve and the intermediate sleeve is less than the friction between the intermediate sleeve and the radially innermost sleeve, and the friction of the radially innermost sleeve on the base part is greater than the friction between the various sleeves of the telescopic assembly.
Advantageously, the base part comprises a hollow shaft equipped with at least one lateral opening defining the filling orifice.
A further subject of the invention is a container equipped with a pump like the aforementioned one.


REFERENCES:
patent: 3489322 (1970-01-01), Ayres
patent: 4315582 (1982-02-01), Micallef
patent: 4396132 (1983-08-01), Christensen
patent: 4410107 (1983-10-01), Corsette
patent: 4674659 (1987-06-01), Micallef
patent: WO 97/05043 (1997-02-01), None

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