# Patent

## Title
Fluid dispenser

## Abstract

A fluid dispenser; in one non-limiting embodiment the fluid dispenser of the invention comprises: a housing, a hand pump, at least one bag, and a stem stabilizer. The housing defines an interior chamber and a housing wall. The housing wall defines at least one air-vent hole for ingress of air. The hand pump has a stem which extends downward into the interior chamber of the housing. The at least one bag is located in the interior chamber and is sealed except for being connected to the at least one air-vent hole. Negative pressure is created in the interior chamber when fluid is extracted from the interior chamber via the hand pump, this causes air to flow into the at least one air bag and thus the fluid inside the interior chamber is kept separate from the air entering the at least one air bag.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
FIELD OF THE INVENTION
This invention relates to dispensers used for dispensing fluids such as, but not limited to, lotions such as skin lotions, and industrial fluids such as volatile organic compounds (VOCs) and lubricants.
BACKGROUND OF THE INVENTION
Fluids are often stored in vessels from which they are intermittently dispensed. Fluids include chemical compositions some of which are vulnerable to oxidation upon prolonged contact with air present in the environment. Some fluids are chemical compositions which include volatile organic components which have a tendency to evaporate or otherwise escape from containers in which they are stored and from which they are dispensed. There is a continual need for ways to reduce fluid exposure to air.
World Intellectual Property Organization (W.I.P.O.) Patent Application Number WO0240122A2 and U.S. Pat. No. 7,000,806 each disclose a dispenser for dispensing a fluid that includes a rigid vial with a main fluid chamber containing a fluid, and a pump assembly that is in fluid communication with the main fluid chamber and is configured to dispense a predetermined quantity of fluid from the main fluid chamber. A flexible bladder is provided which is located within the main fluid chamber and is configured to expand to fill the ullage created within the main fluid chamber during dispensing of fluid by the pump assembly. The resilient bladder tends to force itself outwardly toward the rigid vial and, in turn, increases the pressure within the main fluid chamber in comparison to the interior of the bladder to thereby prevent the ingress of air or vapors through the bladder or otherwise into the main fluid chamber.
U.S. Pat. No. 4,817,830 discloses an improved thin-walled pressure vessel having a bladder therein. This vessel includes a shell having an opening and a spout disposed around the opening. An improved cap normally closes this opening, secures the bladder to the shell of the vessel, and provides communication between the outside of the vessel and the inside of the bladder. The cap member comprises a main body member having an opening which receives a valve member. This valve member extends out through one end of the cap member. It also extends through the opposite end of the cap and into the bladder through an opening in the bladder. The valve member engages a portion of the bladder around the opening and clamps this portion against the main body member to secure the bladder to the cap member. As the pressure in the bladder increases, it forces the valve member further against the walls of the opening in the main body member, increasing the clamping force to firmly secure the bladder to the cap member.
None of the above inventions and patents, taken either singly or in combination, is seen to describe the instant invention as claimed.
SUMMARY OF THE INVENTION
A fluid dispenser for dispensing fluids such as, but not limited to, cosmetic lotions or industrial fluids such as, but not limited to, paint. In one non-limiting embodiment the fluid dispenser of the invention comprises: a housing, a hand pump, at least one bag, and a stem stabilizer. The housing defines an interior chamber and a housing wall. The housing wall defines at least one air-vent hole for ingress of air. The hand pump has a stem which extends downward into the interior chamber of the housing. The at least one bag is located in the interior chamber and is sealed except for being connected to the at least one air-vent hole such that each air-bent hole has a bag connected to it and air is prevented from entering the interior chamber except for the air that enters the at least one air bag. Negative pressure is created in the interior chamber when fluid is extracted from the interior chamber via hand pump, this causes air to flow into the at least one air bag and thus the fluid inside the interior chamber is kept separate from the air entering the at least one air bag.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a fluid dispenser, according to the present invention.
FIG. 1A is a cross-section view of a fluid dispenser, according to the present invention.
FIG. 2 is perspective front section view of a fluid dispenser having a single air bag, according to the present invention.
FIG. 3 is a rear perspective view of the fluid dispenser shown in FIG. 2.
FIG. 4 is a cross-section view of a fluid dispenser, according to the present invention.
FIG. 5 is a perspective view of a fluid dispenser, according to the present invention.
FIG. 6 is perspective front section view of a fluid dispenser having two air bags, according to the present invention.
FIG. 7 is front section view of a fluid dispenser having two air bags, according to the present invention.
FIG. 8 is front section view of a fluid dispenser having two air bags, according to the present invention.
FIG. 9 is a perspective view of a fluid dispenser, according to the present invention.
FIG. 10 is a perspective view of an industrial fluid dispenser, according to the present invention.
FIG. 11 is an enlarged section view of a fluid dispenser, according to the invention.
FIG. 12 shows a table (Table 1) that lists reference numbers and their associated descriptions.



Similar reference characters denote corresponding features consistently throughout the attached drawings.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
This invention is directed to dispensers used for dispensing fluids such as, but not limited to, lotions such as skin lotions, and industrial fluids such as volatile organic compounds (VOCs) and lubricants.
It is to be understood that the terms “top”, “bottom”, “side”, “front”, “rear”, “upper”, “lower”, “vertical”, “horizontal”, “height”, “width”, “length” and the like are used herein merely to describe points of reference and do not limit the present invention to any specific orientation or configuration. The claimed apparatus and components may be of any size, shape or configuration suitable for operation of the apparatus and may be constructed of any suitable materials.
Referring to the Figures in general, a summary of the component parts are listed in Table 1 (see FIG. 12).
The fluid dispenser of the invention is denoted generally by the numeric label “100”. The fluid dispenser 100 comprises a housing 120, a hand pump 140, and at least one bag 160. The hand pump 140 can be any suitable hand pump such as, but not limited to, a hand pump used in NIVEA® “Original Moisture Daily Lotion” dispensers; also such as, but not limited to, a hand pump used in Softsoap® clean ProtectionTM “WASH AWAY BACTERIA” dispensers distributed by COLGATE-PALMOLIVE Company of New York, N.Y., USA.
The housing 120 has a top end 125, a base end 130, an interior chamber 180, and a housing wall 200; the housing wall 200 defines an outer wall surface 210 and an inner wall surface 215. The housing wall 200 defines at least one air-vent hole 220 for ingress of air into the at least one bag 160. The at least one air-vent hole 220 extends through the housing wall 200 between outer and inner housing wall surfaces 210 and 215. The hand pump 140 includes a stem 240; the stem 240 defines an outer stem diameter 250. The stem 240 is in communication with the interior chamber 180; for example, in FIG. 6 the stem 240 is shown extending downward into the interior chamber 180 of housing 100. The housing 100 can be made of any suitable material such as, but not limited to, plastic. The plastic can be translucent, transparent or opaque. The housing 120 can be made of glass. The glass can be translucent, transparent or opaque. Indicia can be printed directly to the outer wall surface 210 of housing wall 200; decals can also be applied to the outer wall surface 210 of housing wall 200. The hand pump 140 can also be made of plastic.
The at least one bag 160 has an opening 170 which is aligned with the at least one air-vent hole 220. The opening 170 can be in sealed engagement with the surrounding surface of the at least one air-vent hole 220. For example, the bag opening 170 can be affixed in air-tight engagement around the at least one air-vent hole 220 using a suitable adhesive 175 (see FIG. 11). The hand-pump 140 is in air-tight sealed engagement with respect to the top end 125 of the housing; this can be achieved by any suitable means such as ultra-sonic welding.
The at least one bag 160 has sufficient volume capacity to ensure that the at least one bag 160 can hold a sufficient amount of air (received by the at least one air-vent hole 220) to ensure fluid 280 can be extracted easily by hand-pump 140.
A stem stabilizer 260 helps the stem 240 resist possible sideways pressure when the at least one air bag 160 fills with air and presses against the stem 240. The stem stabilizer 260 can take any suitable form. The stem stabilizer 260 shown for example in FIG. 4 extends upward from the base end 130 of housing 100. The stem stabilizer defines a circular member 262 which in turn defines through-hole 265; the through-hole 265 has a sufficient bore to accommodate the width of the stem 240. The through-hole 265 of the stem stabilizer 260 secures the stem 240 such that the stem 240 can resist sideways forces that might otherwise cause the stem 240 to flex and hence effectively shorten its operating length inside the interior chamber 180 thereby rendering it harder to extract fluid 280 from the base end 130 via the stem 240 in response to a user (not shown) applying reciprocal motions to the hand pump 140.
Also, the stem stabilizer can be of substantially planar construction with a through-hole 300 disposed therein; the through-hole 300 being of sufficient dimensions to allow the stem 240 to be secured by the through-hole 300. Such an arrangement is shown in FIG. 9 where the planar stem stabilizer is labeled 260p. The stem stabilizer 260p can be used alone. In the alternative, the stem stabilizer 260p can be used in combination with the stem stabilizer 260 as shown in FIG. 9.
During normal operation the fluid dispenser 100 creates negative pressure in the interior chamber 180 thereby causing air to be drawn into the at least one air bag 160 without coming into contact with a fluid 280 inside the chamber 180. For example, FIGS. 1A through 4 show how one non-limiting embodiment of the fluid dispenser 100 works; a user typically uses their hand (not shown) to apply pressure to the top of a hand pump 140 which forces fluid (such as, but not limited to, anti-bacterial liquid soap) to flow from the interior chamber 180 to the exterior of the fluid dispenser 100 via stem 240. The forced fluid extraction from the interior chamber 180 causes negative pressure in chamber 180 which in turn causes air to enter the at least one bag 160 via at least one air-vent hole 220. In FIGS. 1A through 4j only a single bag is shown (labeled as 160s in FIG. 4) and the single air-vent hole 220s. The stem stabilizer 260 ensures that the stem 240 remains in a vertical configuration as the air bag 160s inflates.
In the example as shown in FIG. 4, the stem stabilizer 260 has the circular member 262 with supporting legs for securing the circular member 262 to the housing 120.
FIGS. 6 through 8 show how one non-limiting embodiment of the fluid dispenser 100 works; a user typically uses their hand (not shown) to apply pressure to the top of a hand pump 140 which forces fluid (such as, but not limited to, anti-bacterial liquid soap) to flow from the interior chamber 180 to the exterior of the fluid dispenser 100 via stem 240. The forced fluid extraction from the interior chamber 180 causes negative pressure in chamber 180 which in turn causes air to enter a plurality of air bags 160p via at least one air-vent hole 220. In FIGS. 6 through 8 only two bags are shown (labeled as 160p) and the two air-vent holes are labeled 220p. The stem stabilizer 260 ensures that the stem 240 remains in a vertical configuration as the air bags 160p inflate.
In a further embodiment, the invention is an industrial size fluid dispenser 100i (see FIG. 10) made up of a housing 100i, fluid dispensing line 140i, and at least one industrial sized bag 160pi. The at least one industrial sized bag 160pi which upon full deployment has a volume capacity of the industrial size bag being at least 2 gallons; and preferably between 2 and 25 gallons. An industrial fluid 280i such as, but not limited to, lubricating oil can be dispensed from the industrial size housing 120i via fluid dispensing line 140i. An industrial size fluid dispenser 100i is defined herein as fluid dispenser having the capacity to dispense at least 5 gallons of fluid. The fluid capacity of the fluid dispenser 100i can be between 5 gallons and 200 gallons of fluid. For example, the housing 120i could be a 50 gallon drum. Industrial fluids that can be dispensed by fluid dispenser 100i include, but are not limited to, volatile organic solvents (VOCs). The volume term “gallon” defined as being equal to 3.8 L (i.e., 3.8 liters, to one decimal place; the European spelling of “liters” is: “liters”).
The invention being thus described, it will be evident that the same may be varied in many ways by a routineer in the applicable arts. Such variations are not to be regarded as a departure from the spirit and scope of the invention.

## Claims

1. A fluid dispenser, comprising:
a housing,
said housing defining an interior chamber,
said housing defining a housing wall,
said housing wall defining an air-vent hole for ingress of air;


a hand pump having a stem,
said stem being in communication with said interior chamber of said housing;

a bag,
said bag being located in said interior chamber of said housing,
said bag being sealed except for a connection between said bag and said air-vent hole such that said bag can receive air via said air-vent hole, wherein
during normal operation said hand pump creates negative pressure in said interior chamber which causes air to ingress into said air bag via said air-vent hole; and


a first stem stabilizer for stabilizing said stem such that said stem is prevented from being forced sideways when said air bag fills with air, and wherein
the first stem stabilizer is substantially planar and of a substantially similar cross sectional shape as the interior chamber of said housing.

2. The fluid dispenser according to claim 1, wherein
said first stem stabilizer is of substantially planar construction with a hole disposed in said first stem stabilizer for accommodating the width of said stem of said hand pump.

3. The fluid dispenser according to claim 1, wherein said housing defines a base end, and wherein the fluid dispenser further comprises:
a second stem stabilizer that extends upward from the base end of the housing, and wherein said second stem stabilizer defines a circular member which in turn defines a through-hole, and further wherein said through-hole has a sufficient bore to secure said stem.

4. The fluid dispenser according to claim 1, wherein
the first stem stabilizer is adapted to slidingly and sealingly engage an interior wall portion of the interior chamber such that the fluid remains below the stem stabilizer.

5. A fluid dispenser, comprising
a housing, said housing defining an interior chamber, said housing defining a housing wall, said housing wall defining first and second air-vent holes for ingress of air;
a hand pump having a stem, said stem being in communication with said interior chamber of said housing;
a first bag and a second bag, said first and second bags being located in said interior chamber of said housing, wherein
said first and second bags are connected respectively with first and second air-vent holes; and

a stem stabilizer, said stem stabilizer being of substantially planar construction with a hole disposed in said stem stabilizer for accommodating said stem of said hand pump, and wherein
the stem stabilizer is of a substantially similar shape as the interior chamber of said housing.

6. The fluid dispenser according to claim 5, wherein
the stem stabilizer is adapted to slidingly and sealingly engage an interior wall portion of the interior chamber such that the fluid remains below the stem stabilizer.