Abstract:
The invention concerns a device for dispensing a fluid product designed to be mounted in a reservoir neck, the device comprising: a dispensing member, such as a pump, comprising a body and a mobile actuating rod in the body; and a fixing ring comprising a housing for receiving the body and a socketing skirt to be adapted in the reservoir neck. The invention is characterized in that the skirt outer wall is provided with at least a peripheral bead adapted to be urged or pressed against the reservoir inner wall.

Description:
TECHNICAL FIELD 
     The present invention relates to a fluid dispenser device for mounting in the neck of a tank, which neck may, depending on circumstances, have an inside wall in the form of an upwardly-flaring cone. More particularly, the present invention relates to a fixing ring suitable for receiving the body of a dispenser member such as a pump, the ring also having an engagement skirt of shape corresponding to the shape of the wall of the neck so as to fit in the neck of the tank. 
     BACKGROUND OF THE INVENTION 
     By way of example, document DE-85608 discloses a dispenser device in which a pump is mounted in a plug having a conical outer wall. The plug with a conical outer wall is coated in a covering of rubber. The neck of the tank to which the plug is to be fitted also has a neck whose inside wall is conical to match the plug. The rubber covering of the plug serves to improve fixing and sealing of the plug in the conical neck. However, because sealing contact takes place over the entire frustoconical surface area of the plug, it is difficult to push the plug into the conical neck. Given that the pressure force exerted on the plug is distributed uniformly over the entire frustoconical contact area, it follows that the plug is nowhere in high-pressure contact with the conical neck of the tank. A major drawback results from this fact, whereby the plug is not very well retained in the neck and can come out. Consequently, the use of a rubber covering does not make it possible to obtain good fixing and proper sealing. 
     Another document, U.S. Pat. No. 3,937,366 discloses a dispenser having a tank whose neck is accurately cylindrical, and in which a pump-receiving fixing ring is engaged. For this purpose, the fixing ring has an engagement skirt whose outer wall is cylindrical. To improve fixing of the ring in the neck of the tank, the engagement skirt has a peripheral annular rib provided thereon and the inner wall of the neck of the tank has a peripheral annular groove. Once the fixing ring has been mounted in the neck of the tank, the peripheral annular bead becomes engaged in the peripheral annular groove. The shapes of the peripheral bead and of the peripheral groove are exactly complementary so no pressure is exerted on the bead when it is inside the groove. Consequently, that bead-and-groove arrangement does not contribute to improving sealing between the fixing ring and the neck of the tank, and serves merely-to provide good fixing. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to remedy the above-mentioned drawbacks of the prior art by defining a dispenser device whose fixing ring provides an engagement that is entirely leakproof and a fixing that is reliable. 
     For this purpose, the present invention provides a fluid dispenser device for mounting in a tank neck, the device comprising: a dispenser member, such as a pump, comprising a body and an actuator rod movable in said body; and a fixing ring comprising a reception housing for receiving said body and an engagement skirt whose outer wall is of a shape corresponding to the shape of the wall of the neck so as to fit in said neck of the tank; the outer wall of the skirt being provided with at least one peripheral sealing bead adapted to be compressed against the inner wall of the tank neck. Thus, engagement is entirely leakproof and secure given that all of the force exerted to engage the ring gives rise to annular contact that is very strong because the bead is compressed against the inner wall of the neck. Unlike the above-mentioned German document, sealing contact takes place on a circle only and not over a frustoconical surface, thereby increasing the contact force against the inner wall of the neck. In addition, unlike the above-mentioned American document, entirely leakproof contact is established because the bead cannot snap into a groove of corresponding shape but on the contrary is completely compressed against the inner wall of the neck. 
     According to an advantageous characteristic, the conical outer wall of the skirt is provided with two peripheral sealing beads. The fact of providing two sealing beads on the ring makes it possible further to improve the stability of the ring inside the neck. Together the two sealing beads define two spaced-apart circles such that the ring can no longer tilt inside the neck. In addition, sealing is also improved because the sealing barrier is duplicated. 
     According to another characteristic, the skirt extends around the body with radial separation that forms an annular gap. The fact that the inner wall of the ring is not in contact with the body of the dispenser member enables the skirt to deform inwards during compression of the bead(s) inside the conical neck of the tank. 
     According to another aspect of the invention, the fixing ring forms a guide collar for an actuator head mounted on the actuator rod. 
     In an embodiment, the inner wall of the neck and the engagement skirt of the ring are in the shape of upwardly-flared cones. 
     The invention is described in greater detail below with reference to the accompanying drawings showing an embodiment of the invention by way of non-limiting example. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a vertical section view through a dispenser member of the invention; 
     FIG. 2 is a cross-section view of the FIG. 1 dispenser member mounted on the neck of a tank in accordance with the invention; and 
     FIG. 2 a  is cross-sectional view of an alternate dispenser member mounted on the neck of an alternate tank in accordance with another aspect of the invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As can be seen in the figures, the fluid dispenser device of the invention comprises three essential component elements, namely: a tank  4 , a dispenser member  2 , and a fixing ring  1  for mounting the dispenser member  2  in the neck of the tank  4 . 
     The tank  4  defines an internal volume in which the fluid is stored, and a neck  40  at the top of the tank provides access to the inside of the tank. In the context of the invention, the neck  40  of the tank  4  has an inside wall  41  that is cylindrical in shape, as can be seen in the figures. In a variant, the inner wall  41  could equally well be conical in shape, flaring upwards. Advantageously, if the tank is made of glass, in order to obtain satisfactory surface quality, the conical inner wall  41  could be lapped. 
     The dispenser member  2  can be a pump, for example, but it is also possible to envisage using a valve. In the example shown, it comprises a pump  2  having a pump body  20  within which an actuator rod  21  is movable. The internal structure of the pump is not critical for the invention, and consequently it is not described. At the top end of the actuator rod  21 , there is mounted an actuator head  3 , advantageously provided with a spray nozzle  35 . By pressing on the actuator head  3 , the actuator rod  21  is pushed into the pump body  20 , thereby delivering fluid from the pump body through the actuator rod and then through the nozzle  35 . This kind of pump operation is entirely conventional. 
     To fix the dispenser member  2  on the neck  40  of the tank  4 , the invention provides a fixing ring  1  which comprises firstly a reception housing  12  for receiving the pump body  20 , advantageously by snap-fastening, and secondly an engagement skirt  10  which extends downwards from the reception housing. The engagement skirt  10  has an outer wall of a shape that corresponds to the shape of the wall of the neck, i.e. cylindrical in the drawings, but it could equally well be conical in shape when the wall of the neck is conical, being of a size and of a cone angle that enable it to fit in the conical neck of the tank. The fixing ring can thus be engaged by force on the tank by engaging the cylindrical or conical engagement skirt  10  in the cylindrical or conical neck  40  of the tank. According to the invention, the cylindrical or conical outer wall  15  of the engagement skirt  10  is provided with at least one peripheral sealing bead  14  adapted to be compressed against the inner wall  41  of the neck of the tank  40 . In the example shown in the figures, the cylindrical outer wall  15  is provided with two peripheral sealing beads  14 . The two peripheral sealing beads  14  thus project from the outer wall  15  of the skirt  10  in the form of small swellings. In addition, the two peripheral sealing beads  14  are spaced apart from each other by a certain distance, thus providing advantageous effects concerning the stability of the ring, as explained below. The fixing ring  1  also forms an annular flange  11  which extends outwards from the top end of the engagement skirt  10 . This annular flange  11  is terminated by a cylindrical guide collar for guiding the actuator head  3  that is mounted on the actuator rod  1 . As can be seen in the figures, the actuator head  3  has a skirt  33  which extends downwards around the cylindrical collar  13 . Thus, when the actuator head  3  is actuated it is guided by its skirt engaging on the collar  13 . To enable the actuator head  3  to be pressed down, the collar  13  is provided with a notch  16  for receiving the nozzle  35 . 
     Reference is now made more particularly to FIG. 2 which shows the dispenser member mounted in a cylindrical neck  40  by means of a fixing ring  1  of the invention. As can be seen in this figure, the outer wall  15  of the skirt  10  fits exactly in contact with the inner wall  41  of the neck  40 . In fact, a very small gap (not visible to the naked eye) may exist between these two walls, however that has no ill effect either on fixing or on sealing the device. Because of the presence of two peripheral sealing beads  14 , both fixing and sealing of the fixing ring in the neck  40  of the tank are good. In the engaged position, as shown in FIG. 2, the two peripheral sealing beads  14  are highly compressed against the inner wall  41  of the neck  40 . The compression of these beads  14  exerts strong annular pressure on the inner wall  41  of the neck  40 . The sealing beads  14  are almost completely flattened so that they hardly project any more from the outer wall  15  of the skirt  10 . This provides sealing that is good and reliable. In addition, since there are two sealing beads  14 , two sealing barriers are thus provided. In terms of fixing, the presence of two sealing beads provides a corresponding improvement in fixing in that between them the two sealing beads define a stable cylindrical assembly. In addition, as mentioned above, the gap between the two beads further contributes to stability by defining a greater frustoconical or cylindrical section. Although it is possible in the context of the invention to envisage providing only one sealing bead, it is preferable to provide two sealing beads for the above-mentioned reasons of stability and sealing. It should also be observed that the engagement skirt  10  is not in contact via its inner wall with the body  20  of the pump  2 . This allows the skirt  10  to deform inwards as referenced  140  in FIG. 2 while the sealing beads  14  are being compressed inwards. This avoids deforming the pump body  20  since that could impede its operation. 
     The tank  4  is preferably made of glass, although other materials are not excluded, and the fixing ring  1  is preferably made of a plastics material although other materials are likewise not excluded. With a glass tank and a plastics ring, the sealing bead(s) is/are well compressed against the inner wall  41  of the glass neck  40 . Improved sealing is obtained in accordance with the invention by compressing the sealing bead(s), and improved fixing is obtained by having two beads.