Dispensing – With discharge assistant – Motor operated
Patent
1991-01-04
1993-01-12
Huppert, Michael S.
Dispensing
With discharge assistant
Motor operated
222409, 222504, 417552, 251331, 2513353, B65B 332, F16K 4110
Patent
active
051783045
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a doser-dispenser for at least one pasty and/or liquid product contained under pressure in at least a first storage reservoir, the doser-dispenser being of the type comprising in a first cylindrical housing, on the one hand, an upper supply chamber connected, by a more or less long supply conduit, to said first storage reservoir, and, on the other hand, a lower dosing chamber separated from said supply chamber by a doser piston fixed to the lower end of a control member penetrating in said first housing, sliding in tight manner in said first housing and provided with a central passage adapted to be obturated by an intake valve of which the obturation member urged by a return spring is guided with respect to said piston and cooperates with a valve seat surrounding said central passage, a dispensing chamber provided downstream of the dosing chamber, as well as an ejection valve of which the obturation member loaded by a spring is disposed in said dispensing chamber.
BACKGROUND AND PRIOR ART
In a known doser-dispenser, for example disclosed in German Patent DE-3 024 489, the intake flap is disposed in the dosing chamber and serves as check valve opening and closing automatically solely as a function of the ascending and of the descending movement. In addition, the intake flap is guided directly on the piston and the return spring of said valve is provided at the level of the central passage of the piston. This results in a considerable lack of precision in the dosage, particularly when the product to be dosed is of pasty consistency. In addition, the known doser-dispenser does not lend itself to maintaining sterility inside the supply and dosing chambers.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome the drawbacks of the known doser-dispenser and to propose measures rendering it adapted to conserve a sterile environment whilst enabling a high precision of dosage to be attained.
This object is attained with a doser-dispenser previously defined in that the control member of the doser-piston is constituted by a first control tube of which the end adjacent the intake valve is obturated in tight manner; the obturation member such as a flap of the intake valve is situated on the side of the supply chamber and is carried by the lower closed end of a second control tube guided in the first control tube and extending beyond the lower end thereof; on its section penetrating in the housing, each control tube is surrounded by a bellows; the annular space existing between the section of the first control tube penetrating in said housing and the first bellows is permanently connected to the atmosphere; the upper end of the first bellows surrounding the first control tube is fixed in tight manner on the housing wall traversed by said first tube and the lower end of the first bellows is fixed in tight manner on the lower end part of said first tube; the upper end of the second bellows surrounding the second control tube over its section extending beyond the lower end of the first control tube is fixed in tight manner on the lower end of the first tube below the first bellows, whilst the lower end of the second bellows is fixed in tight manner on the lower end of the second tube or on the intake flap integral with said second tube, and the upper end part of the second control tube is guided in tight manner in the first tube and presents, at its upper end, a control piston which separates the inner volume of the first tube into two chambers of which one is connected to atmosphere and comprises the return spring acting on the intake flap and of which the other is capable of being connected to a source of compressed air or to atmosphere, the pressure of compressed air established in said other chamber acting on said intake flap in the direction opposite that of the corresponding return spring.
Thanks to this concept, the doser-dispenser lends itself to a precise dosage of the product in a sterile environment. In addition, by varying the s
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patent: 2831326 (1958-04-01), Richards et al.
patent: 3399695 (1968-09-01), Stehlin
patent: 3403845 (1968-10-01), Marshall
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patent: 3812398 (1974-01-01), Kozel et al.
patent: 3874630 (1975-04-01), Novey
patent: 4712576 (1987-12-01), Ariizumi et al.
DeRosa Kenneth
ERCA Holding
Huppert Michael S.
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