Dispensing – Hand manipulable shaker with reverse outlet passage
Patent
1999-06-14
2000-10-31
Bomberg, Kenneth
Dispensing
Hand manipulable shaker with reverse outlet passage
119 77, A01K 3902
Patent
active
061388769
ABSTRACT:
This device for plant, animal and bird feeders uses liquid container bottles of the type which are supported in an inverted position and have an outlet opening at its lower end which is in communication with a container basin. A deflated airtight flexible chamber is preassembled to a container basin with a tube outlet to the atmosphere through the container basin bottom. The container bottle is set in an upright position and filled with liquid. The deflated flexible chamber is then inserted into the liquid container threaded neck. This threaded neck is screwed into a threaded receptacle within the basin. The entire assembly is now rotated into an inverted position. Part of the fluid within the container bottle partially fills the container basin and seals the container bottle outlet orifice and because of gravity a partial vacuum is created in the upper region of the container bottle. The forces now acting upon this assembly are; atmospheric pressure on the inside of the flexible chamber and atmospheric pressure on the surface of the liquid in the container basin. The system is now at equilibrium with the space created by the partial vacuum. Any temperature rise affecting the partial vacuum can affect this equilibrium. In order for the fluid to exit the bottle into the container basin it must overcome the resisting force produced by the liquid within the container basin and the atmospheric pressure impinging upon this surface. The relationship of the atmospheric pressure and the area within the container basin is as stated in the following equation: P=F/A or F=PA. From this it follows that the larger the area the greater the force required to raise the level of the fluid within the basin. The pressure inside the airtight flexible inner chamber is always atmospheric. The final result is that the flexible inner chamber contracts and very little of the fluid exits the outer chamber when the pressure in the partial vacuum region is increased due to a temperature increase.
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