Plant husbandry – Receptacle for growing medium – Irrigator
Patent
1995-04-21
1997-09-30
Arola, Dave W.
Plant husbandry
Receptacle for growing medium
Irrigator
47 485, A01G 3102
Patent
active
056715625
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a liquid level control device.
BACKGROUND TO THE INVENTION
Reference is made to my co-pending patent application Ser. No. PL4162/92 and the whole subject matter of the specification thereof is to be considered to be imported hereinto.
SUMMARY OF THE INVENTION
The present invention provides a liquid level control device adapted to be located in a vessel, the device comprising and having a first vent to allow egress of air, and float is at a down position when the level of water in the chamber is at or below a first predetermined level, the first valve will open to allow water into the vessel and into the first chamber, to tend to raise the first float and to displace air in the first chamber via the first vent, level of water in the first chamber is at or above a second predetermined level, the first valve will close to prevent further water flow into the vessel; vent such that, in use, when the second float rises, in consequence of the first valve allowing water into the vessel, the second valve will open to allow air to flow from the first chamber via the first vent and the second valve to escape to atmosphere, drops to a third predetermined level in consequence of water in the vessel being used or being removed, the second float will fall to a level to close the second valve, before the first float has fallen to a level to open the first valve, to thereby prevent air flow via the first vent into the first chamber to establish, as the water level in the vessel falls still further, a partial vacuum in the first chamber which will maintain the water level therein at a level such that the first float will not fall to a level to open the first valve; and level in the vessel falls to below a fourth predetermined level in consequence of water in the vessel being used or being removed, to allow air to enter into the first chamber to overcome the partial vacuum to allow water to flow out of the first chamber to allow the first float to fall to a level to open the first valve to commence again, in use, allowing water into the vessel.
PREFERRED FEATURES OF THE INVENTION
Preferably the second float is located in a second chamber.
For reasons of economy, the second chamber is preferably substantially identical to the first chamber.
Preferably the first chamber and the second chamber have mounting means adapting them to be mounted together as a unit.
Preferably the mounting means is such that the first chamber and the second chamber may be mounted together as a unit with one of the first chamber and the second chamber being located at a selected height with respect to the other of the first chamber and the second chamber.
Preferably the first chamber and the second chamber are each defined by a casing having a side wall, a top wall and a bottom wall.
Preferably the breather comprises a tube extending from adjacent the bottom of the first chamber to adjacent to the top of the first chamber and opening to the first chamber adjacent the top of the first chamber.
The height of the bottom on the breather above the bottom of the vessel can be selected and if close to the bottom then refilling will not occur until almost all the water is used. However, the further above the bottom of the vessel the greater will be the minimum height of water in the vessel.
The cross-section area in plan of the breather will affect the rapidity of recommencing filling and we currently prefer an area of from 6 to 20 square millimeters.
In considering the breather, regard should be had to surface tension effects which can be of assistance and a hindrance. Various plastics which might be used show more and less surface tension effect.
In a preferred aspect, the present invention provides: and up positions of the float, thereof, the valve thereof is respectively open and closed up positions of the float thereof the valve thereof is respectively closed and open; another and are adapted to be joined together as a unit and optionally at a selected height with respect to one another; the bott
REFERENCES:
patent: 2818877 (1958-01-01), Swanson
patent: 4557071 (1985-12-01), Fah
patent: 4581848 (1986-04-01), Krober
patent: 5090443 (1992-02-01), Jacobsen
Arola Dave W.
Downs Joanne C.
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