Dispensing – With discharge assistant – With movable nozzle interconnected therewith
Reexamination Certificate
1999-07-15
2001-03-27
Derakshani, Philippe (Department: 3754)
Dispensing
With discharge assistant
With movable nozzle interconnected therewith
C222S153130
Reexamination Certificate
active
06206245
ABSTRACT:
The present invention relates to a pump for mounting on a receptacle to dispense a substance contained therein.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,355,962 discloses a pump that includes a pushbutton which is movable relative to a pump body between a low position and a high position and which co-operates therewith to define a pump chamber of variable volume, which chamber communicates with a dispensing orifice via a delivery valve which includes a ball that constitutes a retaining valve member in a housing of the pushbutton.
Such a pump comprises a relatively large number of parts and manufacture thereof is expensive.
There exists a need to have a pump whose manufacturing cost is lower, but without the reduction in cost being made to the detriment of reliability.
OBJECTS AND SUMMARY OF THE INVENTION
The invention seeks to satisfy this need.
The invention achieves this by the fact that the pushbutton includes retaining means for the ball that are integrally formed with said housing by molding plastics material.
By means of the invention, the number of component parts of the pump is reduced, thereby enabling its cost to be decreased.
In a particular embodiment, said housing is situated in a duct and said retaining means are constituted by the bottom end of said duct, which bottom end is shaped to enable the ball to be put into place in said housing by elastic deformation.
Still in a particular embodiment, the pump includes a suction valve comprising a ball forming a valve member, and the bottom end of said duct is organized so as to keep the ball of the suction valve in its closed position when the pushbutton is in its low position.
In this way, a pump is provided which is sealed while in its transport position, and that is not always true of known pumps.
Still in a particular embodiment, the pump body includes a vent suitable for communicating via a passage with the outside of the receptacle when the pushbutton is in an intermediate position between its high position and its low position, thereby enabling air to enter into the receptacle while the substance is being sucked into the pump chamber, and the pushbutton is shaped to isolate the vent from the outside when it is in its high position or its low position.
This guarantees good conditions for conserving the substance contained in the receptacle.
The inside of the receptacle does not communicate with the outside except when the pushbutton is an intermediate position between its high position and its low position, i.e. at the time that it is in use.
The substance contained in the receptacle thus remains sheltered from outside air so long as the pushbutton is in its low position for transport or in its high position waiting to be used.
For example, this ensures that solvents or perfumes contained in the substance inside the receptacle do not escape from the receptacle via the air intake passage in the event of the pump being left unused for a long period of time.
In a particular embodiment, the pushbutton has an inner skirt integrally formed therewith and suitable for sliding in sealed manner inside the pump body.
Still in a particular embodiment, said inner skirt bears in sealed manner against the pump body via its bottom portion, and the distance between the vent and said bottom portion when the pushbutton is in its low position is less than or equal to, and preferably substantially equal to, the displacement stroke of the pushbutton from its low position towards its high position, such that said bottom portion isolates said vent from the outside when the pushbutton is in its high position.
Advantageously, said inner skirt bears in sealed manner via its top portion against the top end of the pump body when the pushbutton is in its low position.
In a particular embodiment, the inner skirt has a setback between its bottom portion and its top portion, which setback provides an annular space inside the pump body, into which space said vent opens out while the pushbutton is in its low position and while it is in an intermediate position between its high position and its low position.
In a particular embodiment, the pump body connects via its top end via an annular bearing surface to a mounting skirt which is secured to the neck of the receptacle.
Advantageously, the mounting skirt is extended upwards by a cylindrical wall defining a guide for a helical spring operating in compression to return the pushbutton to its high position.
REFERENCES:
patent: 3146920 (1964-09-01), Benjamin
patent: 3759426 (1973-09-01), Kane et al.
patent: 4369899 (1983-01-01), Magers et al.
patent: 4375266 (1983-03-01), Magers
patent: 4524888 (1985-06-01), Tada
patent: 5351863 (1994-10-01), Cecil et al.
patent: 5711460 (1998-01-01), Saito et al.
patent: 0 779 106 A2 (1997-06-01), None
patent: 1.236.720 (1960-06-01), None
patent: 1158058 (1969-07-01), None
patent: 2 141 186 (1984-12-01), None
patent: 6 016 6769 (1985-08-01), None
Bui Thach H.
Derakshani Philippe
L'Oreal
Oliff & Berridg,e PLC
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