Dispensing – With lock or fastening seal – Inhibiting actuation of discharge assistant
Reexamination Certificate
1999-08-18
2001-02-27
Bomberg, Kenneth (Department: 3754)
Dispensing
With lock or fastening seal
Inhibiting actuation of discharge assistant
C222S321900
Reexamination Certificate
active
06193112
ABSTRACT:
The invention concerns a perfecting dosing pump particularly suitable for the delivery of liquid or thick substances from containers.
As it is known, for the dosing and the delivery of liquid or creamy substances such as soaps, cosmetic creams, cleansings or similars, dosing pumps, which are applied to the container that contains said substances, are fully used.
Said pumps are normally supplied with recovery means of the pumping piston to a rest position after any delivery and other pumps which contemplate devices for the blocking of said piston in a rest position are also known.
However the blocking means till now known present some limitations in such particular situations which can usually happen.
For example some blocking means of the pumping piston which are substantially formed of a striker, present in the guide of the piston, on which elements belonging to the piston contrast, after its partial rotation on its axis, are known.
This kind of solution reveals in the practice its limitations when in particular the pumping piston, usually surmounted by a dispenser, is subjected to a considerable pressure or torsion; it happens that the blocking system can subside and that the guide of the piston can break as a result causing or the lowering of the piston itself, or in any case the leakage of the liquid from the container. In any case the integrity of the product is loosen.
This event can usually happen, when for example, in case of packaging of containers supplied with this dosing pump for the large scale retail trade, it happens that they are stocked one over the other in even a considerable number; as a result it is obvious that the weight of the upper containers will exert a considerable pressure on those at the bottom of the pile. It's clear that these ones, by such a considerable weight, will be inevitably damaged, even being supplied with the blocking means before described.
Equally such event can occasionally happen even for a common consumer of said products, which can bring one of them with him for example during a journey: the container can always been subjected to pressures or torsions similar to those before described in case of stacking of suitcases, jolts, bumps etc.
The U.S. Pat. No. 4,162,746 discloses a liquid dispenser having a relatively rotable closure the main features of which are according to the precharacterizing portion of claim
1
of the instant invention, but do not completely overcome the possible breaking under special conditions.
The present invention intends to overcome such inconveniences.
The purpose of the invention is in particular for realizing a dosing pump for the delivery of liquid or creamy substances from containers, in which the pumping piston resists to a greater vertical load in a rest position.
A further purpose of the invention is for, in any case, the blocking of said piston resists, in a rest position, to different stresses, such as torsions, bumps etc. ensuring more the integrity of the product.
The mentioned purposes are achieved by the realization of a dosing pump for liquids to apply to a container that according to the main claim comprises:
a cylindrical chamber communicating with said container and suitable for receiving said liquid to deliver;
a cylindrical collar suitable for connecting said pump to the container of the liquid;
sealing valves;
a hollow piston axially sliding in said cylindrical chamber, supplied inside with a tubular chamber and outside with longitudinal opposed guides, in order to permit the sliding along a supporting and guiding element, said piston ending with an element dispenser of liquid;
recovery means for recovering this piston to a rest position after delivery;
a supporting and guiding element for said piston presenting, in the inner cylindrical surface, longitudinal grooves which cooperate with said guides of said piston;
at least a striker plane of the longitudinal guides of said piston which develops itself beginning from at least one of said grooves, along an arch of said inner cylindrical surface of said supporting element, suitable for keeping said piston in a rest position, by contact of one end of one of said longitudinal guides on said striker plane, when the piston is rotated on its axis, said striker plane presenting a shoulder of such a length that it prevents any further rotation of said piston along said striker plane, said dosing pump being wherein said inner cylindrical surface is laterally connected with the outer cylindrical surface of said supporting and guiding element by a plurality of radial reinforcement wings.
Advantageously the presence of the shoulder and of the radial reinforcement wings permits to the pumping piston to withstand pressures, torsions or even considerable stresses without breaking the supporting and guiding element.
REFERENCES:
patent: 4162746 (1979-07-01), Anderson et al.
patent: 4340158 (1982-07-01), Ford et al.
patent: 4496082 (1985-01-01), Corsette
patent: 4991746 (1991-02-01), Schultz
patent: 5405057 (1995-04-01), Moore
patent: 5615806 (1997-04-01), Grothoff
patent: 5899363 (1999-05-01), Bliss, III et al.
patent: 94 18 511 (1995-03-01), None
patent: 2 530 586 (1984-01-01), None
Bomberg Kenneth
Dykema Gossett PLLC
Taplast SPA
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