Measured fluid dispenser
A measured fluid dispenser for dispensing fluid from a storage container includes a measurement chamber, a fluid flow passage fluidly connecting the measurement chamber with the storage container, and a valve that is movable between an open position in which the fluid flow passage is opened to permit fluid flow from the storage chamber to the measurement chamber, and a closed position in which the fluid flow passage is closed to prevent fluid flow between the measurement chamber and the storage chamber. The measurement chamber may be adjustable to vary a fillable volume of the measurement chamber to thereby preselect an amount of fluid to be dispensed.
1 . An adjustable measured fluid dispenser for dispensing fluid from a storage chamber of a storage container, the fluid dispenser comprising:
a measurement chamber of a measurement container having a fillable volume;
a cap operably couplable to the container, the cap at least partially forming a divider configured to separate the measurement chamber from the storage chamber of the container, the measurement container being fluidly sealed to the cap with at least one seal;
at least one fluid flow passage extending through the divider and being configured to fluidly connect the measurement chamber with the storage chamber of the container; and
at least one valve configured to open the at least one fluid flow passage and permit fluid flow from the storage chamber to the measurement chamber, and configured to close the at least one fluid flow passage to prevent fluid flow between the measurement chamber and the storage chamber;
the cap having one or more axially extending guide slots that slidably receive and guide corresponding one or more radially inwardly extending guide protrusions on an inner portion of the measurement container, such that the measurement container is slidably movable axially upwardly and downwardly relative to the cap to adjust the fillable volume of the measurement chamber, and
one or more detents arranged at an interface between the cap and measurement container that are configured to indicate discrete graduated fillable volumes of the measurement chamber.
2 . The adjustable measured fluid dispenser
according to claim 1 , wherein the at least one valve comprises at least one check valve configured to:
open the at least one fluid flow passage and permit fluid flow from the storage chamber to the measurement chamber;
close the at least one fluid flow passage to prevent fluid flow between the measurement chamber and the storage chamber; and
open at a predefined cracking pressure.
3 . The adjustable measured fluid dispenser according to claim 2 ,
wherein the at least one fluid flow passage includes a first fluid flow passage, the dispenser further comprising a second fluid flow passage extending through the divider and being configured to fluidly connect the measurement chamber with the storage chamber of the container,
wherein the dispenser is configured to permit liquid to flow through the first fluid flow passage from the storage chamber of the container into the measurement chamber in response to opening of the at least one check valve, and is configured to permit air in the measurement chamber that is displaced by the liquid to escape from the measurement chamber into the storage chamber of the container via the second fluid flow passage.
4 . The adjustable measured fluid dispenser according to claim 2 , wherein:
the at least one check valve includes a first check valve, the at least one fluid flow passage includes a first fluid flow passage, and the predefined cracking pressure is a first predefined cracking pressure,
the dispenser further comprising a second fluid flow passage extending through the divider and being configured to fluidly connect the measurement chamber with the storage chamber of the container, and further comprising a second check valve configured to open or close the second fluid flow passage, the second check valve being configured to open at a second predefined cracking pressure,
the first check valve being configured to open at the first cracking pressure to permit liquid to flow through the first fluid flow passage from the storage chamber of the container into the measurement chamber, and
the second check valve being configured to open at the second cracking pressure to permit air in the measurement chamber that is displaced by the liquid to escape from the measurement chamber into the storage chamber of the container.
5 . The adjustable measured fluid dispenser according to claim 4 ,
wherein the first and second check valves are respectively configured such that the first cracking pressure is different from the second cracking pressure, so that the first and second check valves are activated to open or close at different times when the dispenser is in use.
6 . The adjustable measured fluid dispenser according to claim 4 ,
wherein the first and second check valves are respectively configured such that the second cracking pressure is lower than the first cracking pressure.
7 . The adjustable measured fluid dispenser according to claim 4 ,
wherein the first and/or second check valve is a one-piece elastomeric valve.
8 . The adjustable measured fluid dispenser according to claim 4 ,
wherein the first and/or second check valve is an umbrella valve having a sealing disc that seals against the divider to close the respective first and/or second fluid flow passage, and in which the sealing disc separates from the divider to open the respective first and/or second fluid flow passage.
9 . The adjustable measured fluid dispenser according to claim 2 , in combination with the container to form an assembly, the assembly being configured such that:
the measurement chamber is sealed from an environment external to the assembly;
an input side of the at least one check valve is exposed to fluid pressure from the storage chamber of the container, and an output side of the at least one check valve is exposed fluid pressure from the measurement chamber, wherein the predefined crack pressure is at least partially based upon a pressure differential at the input side relative to the output side, in which the at least one check valve is configured to open when the fluid pressure in the storage container exceeds the fluid pressure in the measurement chamber by a predefined amount;
wherein the at least one check valve is configured to open when the container is turned upside-down and compressed with a compression force to thereby increase the fluid pressure in the storage container to meet or exceed the predefined crack pressure, and is configured to close at least when the compression force is released while the container is still turned upside-down.
10 . The adjustable measured fluid dispenser according to claim 2 , wherein the predefined crack pressure for the first and/or second check valve is in a range from 1 kPa to 10 kPa.
11 . The adjustable measured fluid dispenser according to claim 1 ,
wherein the divider has at least one outlet of the at least one fluid flow passage that opens into the measurement chamber; and
wherein the fillable volume of the measurement chamber is at least partially defined by internal surfaces of the measurement container, wherein at least one internal surface of the measurement container is movable relative to the outlet and/or the divider to adjust the fillable volume of the measurement chamber.
12 . The adjustable measured fluid dispenser according to claim 11 ,
wherein a bottom surface of the measurement container is axially movable toward or away from the outlet and/or the divider to adjust the fillable volume of the measurement chamber.
13 . The adjustable measured fluid dispenser according to claim 1 ,
wherein the measurement container is a measurement cup that is securably couplable to and removable from the divider and/or container.
14 . The adjustable measured fluid dispenser according to claim 1 ,
wherein the divider is at least partially formed by an intermediate part of the dispenser, the intermediate part being in the form of a cap that is threadable to the container to cover an opening of the container.
15 . The adjustable measured fluid dispenser according to claim 1 ,
wherein the divider is at least partially formed by an intermediate part of the dispenser, the intermediate part having one or more axially extending guide slots that slidably receive corresponding one or more guide protrusions of the measurement container, such that the measurement container is slidably movable axially relative to the intermediate part to adjust the fillable volume of the measurement chamber, and
wherein the intermediate part and/or the measurement container includes detents that are arranged to indicate discrete graduated fillable volume of the measurement chamber.
16 . The adjustable measured fluid dispenser according to claim 15 ,
wherein the respective detents are formed by axially spaced apart teeth, and wherein the axial spacing between the teeth corresponds with an increase or decrease in the fillable volume of the measurement chamber in the range from 1 mL to 5 mL.
17 . The adjustable measured fluid dispenser according to claim 1 ,
wherein the measurement container includes at least one part this is configured to flex in response to an input force from a user to thereby deform the measurement container and release at least one of: a detent, a catch, a locking mechanism, or a seal that seals the measurement chamber.
18 . The adjustable measured fluid dispenser according to claim 1 ,
wherein the measurement container includes at least one dividing wall that divides the measurement chamber into at least two measurement chamber regions having differently sized fillable volumes;
wherein the fillable volume is adjustable by selecting one of the at least two measurement chamber regions and arranging the selected chamber region relative to the divider such that an outlet of the at least one fluid flow passage opens into the selected chamber region.
19 . A method of dispensing fluid from the measured fluid dispenser according to claim 1 , comprising:
adjusting the measurement chamber to a desired amount of fluid to be contained in the measurement chamber
turning the measured fluid dispenser upside-down;
squeezing the storage container of the adjustable fluid dispenser until the measurement chamber is filled; and
dispensing the fluid from the measurement container.