Dispensing – With casing or support – Jacketed
Patent
1998-04-21
2000-01-04
Kaufman, Joseph A.
Dispensing
With casing or support
Jacketed
2223214, 2223217, 222340, 222394, B67D 506
Patent
active
060100362
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dispenser of substances in liquid or paste form.
2. Description of the Related Art
Dispensers are already in existence that comprise, in particular, a cylinder of substance surmounted firstly by an endpiece provided with an internal evacuation duct and fitted, secondly, with means for extracting the substance, and provided with an exhaust valve.
In general, the substance is taken from the cylinder by means of a pump that possesses an admission valve which co-operates with the exhaust valve to define a chamber inside the body of the pump.
The chamber is suitable for being put initially into suction to suck in substance from the cylinder, and then under pressure to expel said substance to the outside.
Unfortunately, such dispensers are relatively complex and therefore fragile insofar as they are constituted by a large number of parts.
Consequently, they are relatively expensive, thereby making them unattractive for use with samples.
In addition. beneath the pump body, the substance must fill the volume of the cylinder completely so as to avoid bubbles of air appearing subsequently and leading to faulty operation by loss of priming. Under such conditions, the various component elements are difficult to assemble.
SUMMARY OF THE INVENTION
An object of the present invention is to Solve the above technical and economic problems by providing a device in which the number of component parts is reduced and which is capable simultaneously of ensuring packaging that is simple and leakproof, and of dispensing the substance reliably.
According to the invention, this object is achieved by a dispenser of substance in liquid or paste form, the dispenser being of the type comprising, in particular, a cylinder of substance surmounted firstly by an endpiece provided with an internal evacuation duct and fitted, secondly with substance-taking means provided with an exhaust valve, the dispenser being characterized in that said substance-taking means comprise a piston received in the cylinder and having an axial duct passing therethrough and connected to an outlet tube whose bottom end co-operates with said axial duct to define an admission orifice and whose top end is secured to said endpiece forming a pushbutton which bear; directly or indirectly on the outside face of the piston to put the cylinder under pressure.
According to an advantageous characteristic, the outside face of said piston includes a bush co-operating with the internal side wall of the cylinder to define a peripheral space in which the bottom side portion of the endpiece is engaged.
According to another characteristic, the top edge of the cylinder is provided with a shoulder under which a peripheral flange formed on the bottom side edge of the endpiece is engaged.
According to yet another characteristic, said endpiece is constituted firstly by a dispenser head provided with said internal evacuation duct communicating at its bottom end with the outlet tube and extending, secondly, towards the cylinder by means of a lateral skirt.
Preferably, the cylinder is provided with an internal lateral jacket.
In addition, provision is made for the dispenser to include a removable cap designed to cover the endpiece. The cap is engaged telescopically on the top portion of the internal jacket, being flush with the outside wall of the cylinder. Its internal side wall is also provided with a longitudinal groove forming a vent.
In a first embodiment, said endpiece is axially movable relative to the piston, being urged away therefrom by a spring bearing against the outside face of the piston.
The outlet tube is then formed by a hollow rod slidably engaged in the axial duct and having its bottom end projecting into the cylinder regardless of the position of the endpiece.
In this embodiment, the bottom end of the outlet tube is closed by a solid base of larger section designed to bear in sealed manner against the internal rim of the axial duct when the endpiece is being returned, thereby fo
REFERENCES:
patent: 5207659 (1993-05-01), Pennaneac'h et al.
patent: 5267673 (1993-12-01), Crosier et al.
patent: 5427280 (1995-06-01), Fuchs
patent: 5620113 (1997-04-01), Meshberg
patent: 5813571 (1998-09-01), Gaucher
Amiel Pierre
Bougamont Jean-Louis
DuMont Pierre
Kaufman Joseph A.
Sofab
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