Dispensing – With discharge assistant – With movable nozzle interconnected therewith
Patent
1997-12-19
1999-02-09
Huson, Gregory L.
Dispensing
With discharge assistant
With movable nozzle interconnected therewith
222542, B65D 8854
Patent
active
058682864
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a manual dispenser device to be applied with no gasket to the mouth of a bottle containing a more or less dense liquid substance, pump which is held fast thereto by a ring nut mounted on the threaded neck of said bottle.
The manual pump of the type mentioned above comprises a hollow body, with check valve; a hollow stem, movable coaxially to said hollow body, bearing an outflow push-button; a piston, inserted on said stem and movable within said hollow body, in which it defines a pressure chamber; separate elastic return means for said stem and said piston; an annular element closing the hollow body.
Dispenser devices of the prior art present a hollow body whose upper portion is shaped, in the vicinity of the outflow push-button, into an edge with radial development destined to be held against the rim of the mouth of the bottle by a ring nut screwed on to the threaded neck of the bottle. In certain embodiments, this edge of the hollow body is flat and it is destined to rest on an annular gasket placed on the mouth of the bottle. In other embodiments, this edge of the hollow body has a lip whose free end is set against the rim of the mouth of the bottle.
In the embodiments with gasket, the seal preventing leakage of the more or less dense liquid substance contained in the bottle is satisfactory, but the inclusion of the gasket increases manufacturing and assembly costs. In particular, the gasket is generally made of an elastic material, which differs from the other plastic materials making up the pump and the bottle, resulting in differentiated recycling problems.
In the embodiments with rabbet lip, the seal is generally less satisfactory, especially in that it entails the accurate machining of the surface of the mouth rim, in which the seal is essentially linear.
The latter type of embodiment mentioned above, however, presents the problem that the radially developed edge of the hollow body of the pump must be dimensioned to fit the particular bottle mouth. However, commercially available bottles, even of the same type and size, may present dimensional or shape differences also in their mouth profile, and thus different pump hollow bodies, if not indeed different pumps, must be provided for the various commercial bottle mouth sizes.
The purpose of the present invention is therefore to eliminate the drawbacks mentioned above.
In particular, the purpose of the present invention is to achieve a better seal between hollow body and bottle, without adding different means, such as gaskets and the like, and without entailing an increase in manufacturing costs.
Yet another purpose of the present invention is to embody dispenser devices destined to be applied with their hollow bodies on to a wide range of bottle mouth sizes, with the resulting reduction in production costs.
The invention, as characterised by the claims which follow, solves the problem of providing a manual dispenser device to be applied with no gasket to the mouth of a bottle containing a more or less dense liquid substance, and held fast thereto by a ring nut mounted on the threaded neck of said bottle, the pump being of the type comprising an essentially cylindrical hollow body, open at its ends, with a check valve being fitted in correspondence with a first end; a hollow stem, movable coaxially to said hollow body, an end of said stem, protruding outside through the second end of said hollow body, bearing an outflow push-button; a piston, inserted on said stem and movable within said hollow body, the internal part of the hollow body between said piston and said check valve defining a pressure chamber; at least one elastic return means for said stem and said piston; an annular element closing said second end of said hollow body, said closing element also serving as a guide for said stem, which in general is characterised in that said hollow pump body presents at its top, in proximity of its said second end, a folded-back lip shaped into an inverted V cross section and circumscribing said bottle neck mouth, by means
REFERENCES:
patent: 3907174 (1975-09-01), Steiman
Huson Gregory L.
SAR S.p.A.
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