Dispensing – With material treatment or conditioning means
Patent
1992-07-07
1993-12-21
Mitchell, David M.
Dispensing
With material treatment or conditioning means
222321, 222384, B67D 506, G01F 1104
Patent
active
052715302
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a foam dispensing pump container for foaming a foamable liquid, e.g., a detergent, hand soap, or shampoo, by mixing it with air, and thereafter homogenizing the foam and dispensing it small amount at a time.
BACKGROUND ART
Conventionally, foam dispensing pump containers based on the method of storing a high-pressure gas, e.g., a carbon dioxide gas and a Freon gas, in a container together with a foamable liquid creating foam upon dispensing and are in wide practical use. With the growing public consciousness for the global environment in these years, however, there have been apparent moves for totally banning use of such kinds of high-pressure gases in an attempt to protect the global atmosphere. Accordingly, demands have arisen for a foam dispensing pump container not using the high-pressure gas.
Japanese Utility Model Registration No. 1529456 (Japanese Utility Model Publication No. 58-23415) discloses a typical example of a foam dispensing pump container not using a high-pressure gas. The proposed arrangement according to this disclosure may be briefed as follows. That is, this foam dispensing pump container comprises a double cylinder which is provided at an opening portion of a container containing a liquid and which is constituted by air and liquid cylinders that are concentrically provided, a dip tube for allowing a bottom portion of the liquid cylinder and a bottom portion of the container to communicate with each other, a piston assembly constituted by air and liquid pistons integrally provided and movable up and down in the air and liquid cylinders, respectively, a nozzle member provided at an upper end of the piston assembly and having a foam dispensing hole portion, an air flow path for allowing the hole portion and the air cylinder to communicate with each other, a liquid flow path for allowing the liquid cylinder and the hole portion to communicate with each other, a first check valve disposed midway along the liquid flow path, a second check valve disposed in the liquid cylinder, a compression spring for urging the piston assembly to a top dead point with respect to the double cylinder, a lid member for fixing the double cylinder to the container and defining the air cylinder to guide insertion of the piston assembly therethrough, and an interposed permeable object or a porous member, e.g., a sponge, having a function of introducing outer air and generating and discharging foam at a juncture of the air flow path and the liquid flow path in the hole portion.
With the above arrangement, when the piston assembly moves up and down, the liquid supplied from the liquid cylinder and air supplied from the air cylinder are mixed in the interposed permeable object to generate foam and dispense it through the hole portion of the nozzle member.
However, the aforementioned interposed permeable object of this proposal has the first problem in that, since it has has two functions, i.e., a function of introducing the outer air into the air cylinder and a function of generating and discharging the foam, the fluid resistance upon introduction of the outer air essentially becomes large enough to disturb smooth reciprocal movement of the piston assembly. The interposed permeable object also has a second problem. That is, the liquid component of the foam remaining in the interposed permeable object gets dry and solidified in it, causing clogging.
Japanese Utility Model Registration No. 1467526 (Japanese Utility Model Publication No. 57-20285), which is filed by the same applicant as Japanese Utility Model Registration No. 1529456 described above, proposes another foam dispensing pump container not using a high-pressure gas. According to this second proposal, the double cylinder in the arrangement of above Japanese Utility Model Registration No. 1529456 is provided with the liquid cylinder which stands at the central portion of the bottom portion of the air cylinder, an outer air inlet hole having an operational valve is formed in the air cylinder to allow the li
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Miyagi Takashi
Uehira Shoji
Bomberg Kenneth
Daiwa Can Company
Mitchell David M.
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