Dispensing – With material treatment or conditioning means
Patent
1996-11-01
1998-07-14
Derakshani, Philippe
Dispensing
With material treatment or conditioning means
2223218, B67D 558
Patent
active
057791040
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an appliance for the generation and discharge of foam, in particular soap foam.
2. Description of the Prior Art
Such appliances are installed at washing points of, for example, bathing establishments and toilets, in order, for example for washing the hands, to generate and discharge a metered quantity of soap foam. A simple actuation of the appliance by hand is sufficient for this purpose, in order to generate and at the same time issue a specific quantity of foam. Appliances of this type can be part of a foam dispenser installed fixedly above or at the washing point or also be arranged as an attachment directly on a liquid storage tank.
U.S. Pat. No. 1,896,624 discloses a soap-foam dispenser which consists of a housing having a cylindrical air chamber of variable volume and of a device, arranged coaxially thereon, for conveying foamable liquid out of a tank simultaneously with the conveyance of air, the device being formed non-return valve by the actuating element for the compression of air, and both the air chamber and a chamber provided with the non-return valve being connected, in the device, to a foaming chamber, to which the foam-outlet duct is connected. The housing part surrounding the air chamber serves at the same time as an actuating element for the compression of air and for the conveyance of the air into the foaming chamber which is arranged in a part of the foam-outlet duct fixed laterally to the housing. When a compression stroke for the air ends, the foam expulsion also ceases, that is to say formed foam remains both in the foaming chamber and in the foam-outlet duct, runs out or becomes encrusted in the course of time, particularly when the appliance remains unused for a relatively long time. No return suction of the foam occurs, because the air chamber does not acquire its thrust of air through the foam-outlet duct, but through an orifice in the wall of the air chamber.
An attempt was made to solve this problem with a foam dispenser according to European Patent 0,019,582, in that, after the foam discharge, residual foam remaining in the mixing chamber and in the foam-outlet duct is blown out. However, this is at the expense of a special construction of the appliance which makes it possible first to generate and expel foam and then subsequently to expel the residual foam with a further air blast, this usually always entailing an "afterdrip" of foam. Apart from that, a special air-cushion chamber is necessary, so that the liquid which has flowed in there from a storage tank can be driven by means of a valve-slide piston into the foaming chamber arranged stationarily in the dispenser housing, whilst the slide piston has to be guided with an exact fit in a cylinder.
Proceeding from a foam dispenser according to U.S. Pat. No. 1,896,624, the object on which the present invention is based is to provide a foam dispenser which, whilst having a simple construction, makes the subsequent blow-out unnecessary and prevents a possible afterdrip of foam or of foam which has become liquid again.
SUMMARY OF THE INVENTION
This object is achieved by means of an appliance according to the present invention having the following features: variable volume and of a device, arranged coaxially thereon, for conveying foamable liquid out of a tank simultaneously with the conveyance of air, the suction side with non-return valve by the actuating element for the compression of air, and both the air chamber and a chamber provided with the non-return valve being connected, in the device, to a foaming chamber, to which the foam-outlet duct is connected. At the same time, there is arranged in the air chamber a piston having a central insert which is fixedly connected to the piston. The unit formed from the insert and piston is supported against the bottom of the air chamber by means of a spring. Arranged in the insert is an air duct which connects the foaming chamber, arranged centrally in the insert, to the air chamber. There projects into
REFERENCES:
patent: 1896624 (1933-06-01), Hollands
patent: 4349131 (1982-09-01), Arabian
patent: 4932567 (1990-06-01), Tanabe et al.
patent: 5271530 (1993-12-01), Uehira et al.
patent: 5310093 (1994-05-01), Bennett
patent: 5462208 (1995-10-01), Stahley et al.
Derakshani Philippe
Eureka Development Ltd.
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