Dispenser with variable-volume storage chamber, one-way valve, and manually-depressible actuator
A dispenser has a housing, and a variable-volume storage chamber formed within the housing and defining a substantially fluid-tight seal between the chamber and exterior of the housing for storing a substance to be dispensed. A piston is mounted within the housing, and a one-way valve is mounted within the housing and coupled in fluid communication with the variable-volume storage chamber. A compression chamber is coupled in fluid communication between the piston and one-way valve, and at least one of the piston and valve is manually depressible relative to the other between (i) a first position in which the piston is located at least partially outside of the compression chamber for permitting substance to flow from the variable-volume storage chamber into the compression chamber, and (ii) a second position in which the piston is located at least partially within the compression chamber for pressurizing substance within the compression chamber above a valve opening pressure and, in turn, dispensing substance through the one-way valve and out of the dispenser.
1. A dispenser comprising:
a housing;
a storage chamber located within the housing and defining a seal between the chamber and exterior of the housing for storing a substance to be dispensed within the storage chamber;
a manually engageable surface that is manually engageable and depressible to actuate the dispenser, wherein the manually engageable surface is formed of a resilient material and is manually depressible between first and second positions and is normally biased in a direction from the second position toward the first position;
a one-way valve connectible in fluid communication with the storage chamber, wherein the one-way valve includes a valve seat and a valve member normally engaging the valve seat and thereby defining a normally closed condition defining a normally closed outlet when the valve member is engaged with a valve seat that prevents a flow of the substance therethrough;
an outlet aperture coupled in fluid communication between the storage chamber and the one-way valve;
wherein the valve member is movable away from the valve seat from the normally closed condition to an open condition in which the valve member is spaced away from the valve seat that allows the substance to flow through the valve when the substance passing through the outlet aperture exceeds a valve opening pressure and thereby disengages the valve member from the valve seat; and
a compression chamber connectible in fluid communication with the one-way valve, wherein during movement of the manually engageable surface in a direction from the first position toward the second position, the substance at the outlet aperture is pressurized above the valve opening pressure and, in turn, the substance is dispensed through the normally closed outlet of the one-way valve and out of the dispenser;
wherein once the substance is dispensed, the one-way valve returns to the closed condition; and
wherein the one-way valve and the storage chamber are configured to substantially prevent any germs, bacteria or other unwanted substances from entering the dispenser and contaminating the substance within the dispenser throughout storage and dispensing thereof.
2. A dispenser as defined in claim 1 , further comprising:
a piston mounted within the housing, wherein the valve and piston are axially aligned, and wherein movement of the manually engageable surface in a direction from the first position toward the second position causes movement of the piston; and
a biasing member configured to bias the piston toward a resting position thereof.
3. A dispenser as defined in claim 2 , wherein the biasing member is at least one of a coil spring and a resilient, elastomeric spring.
4. A dispenser as defined in claim 3 , wherein the resilient, elastomeric spring is approximately dome shaped.
5. A dispenser as defined in claim 1 , further comprising one of (i) a flexible bladder mounted within the housing and defining the storage chamber, and (ii) a slidable wall engaging the housing and defining the storage chamber between the slidable wall and the housing.
6. A dispenser as defined in claim 1 , wherein the storage chamber is substantially airless.
7. A dispenser as defined in claim 1 , further comprising a plunger engaging the housing and forming a substantially fluid-tight seal therebetween, wherein the plunger is movable axially upon dispensing a volume of dosage from the storage chamber to reduce the volume of the storage chamber in an amount approximately equal to the volume of the dosage dispensed.
8. A dispenser as defined in claim 1 , wherein the normally closed outlet of the one-way valve is adjacent to the manually engageable surface.
9. A dispenser as in claim 2 , wherein depressing the manually engageable surface moves the piston from the first position toward the second position, and, in turn, pressurizes the substance.
10. A dispenser as defined in claim 1 , wherein the one-way valve includes an elastic portion.
11. A dispenser as defined in claim 1 , wherein when the valve returns to the closed condition, pressure in the storage chamber equalizes.