Dispensing – Resilient wall – Supply container delivering to receiving chamber
Patent
1994-03-01
1995-06-27
Shaver, Kevin P.
Dispensing
Resilient wall
Supply container delivering to receiving chamber
222209, 222333, B65D 3700
Patent
active
054272793
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to dispensers for liquids the dispensers being operable manually or by a suitable actuator to create an increase of pressure in the dispenser which in turn results in dispensing.
2. Background Art
Products in liquid form have for many years been packaged in a variety of containers suitable for shipping, displaying, handling and eventual sale. These containers have been made in a great variety of shapes and sizes with different types of closures. They include glass containers, and containers of synthetic plastics materials which have been molded, blow-molded and generally formed into shape. Also, because of the nature of these plastics materials, the closures can be of many various types including screw caps, flip tops, and simple bonded seals. In general, containers of these types have been made to enhance the product and little thought was given to disposing of the container.
More recently it has become common practice to recycle materials wherever possible, and there is a growing impetus to reduce the amount of packaging material used in selling products so that recycling will be minimized. As a consequence of this, there is a growing interest in selling liquid products in volume and transferring the liquid as required into a dispenser. These dispensers will be useful for a long period of time and the overall use of packaging materials will therefore be reduced.
The present dispenser fits into this arrangement and can be adapted to dispense liquid from bulk containers.
It is also expected that the marketplace will continue to need improved dispensers which are used with a product and then discarded. Dispensers according to the invention have advantages when used in this way also.
Dispensers of the present type are taught by U.S. Pat. Nos. 4,324,349, 4,635,828, 4,645,097, and 5,033,653. These dispensers have no moving parts and yet satisfy the requirements of clean dispensing with temperature conpensation to permit the dispenser to be subjected to a designed temperature range without inadvertent dripping or dispensing caused by temperature variations.
The structures shown in the applicant's earlier patents are simple, and relatively inexpensive to manufacture. The dispensers have a reservoir containing some of the liquid to be dispensed and in communication with the main part of the dispenser in the form of a container where the major volume of the liquid is contained. Air is trapped above the liquid in the container under a negative pressure which prevents the liquid flowing through the reservoir and out through a discharge passageway. When the container is deformed, the negative pressure is overcome to some extent so that liquid will flow out of the container and into the reservoir, then out via the passageway. As soon as the pressure is released, a negative pressure is created by the walls of the container returning from a deflected condition to the original condition so that air is sucked back into the passageway and the reservoir is set up in a condition of equilibrium. As the air is sucked back, liquid is cleaned out from the passageway and some of the air finds its way through the liquid to finish above the liquid in the container and some remains in the reservoir. It is the air in the reservoir which effectively provides the temperature compensation. As temperature increases, the negative pressure above the liquid in the container becomes more positive resulting in some flow into the reservoir, and liquid will consequently rise in the reservoir and displace air out of the passageway. This action can continue within a range of calculated temperature compensation.
U.S. Pat. No. 5,033,653 is an improvement over the earlier patents in which the concept of temperature fluctuation is separated as a parameter from response rate. This is achieved by providing a small opening communicating the reservoir to atmosphere so that as temperature compensation takes place equalization will result through the small opening. On the other hand, when dispensing ta
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patent: 4018363 (1977-04-01), Cassia
patent: 4222525 (1980-09-01), Hildebrandt
patent: 4324349 (1982-04-01), Kaufman
patent: 4635828 (1987-01-01), Kaufman
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patent: 4966312 (1990-10-01), Waring
patent: 4972975 (1990-11-01), Fuhrig
patent: 5033653 (1991-07-01), Kaufman
patent: 5060830 (1991-10-01), Krall
patent: 5217147 (1993-06-01), Kaufman
Kaufman Products Inc.
Shaver Kevin P.
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