Apparatus to control the water level in a swimming pool
Patent 3997925 Issued on December 21, 1976. Estimated Expiration Date: 
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1820981 2707482 2739939 3386107 3739405 3759286 3908206 InventorApplicationNo. 579315 filed on 05/21/1975US Classes:4/508, And water level control137/426, Level adjustment or selection means137/428In separate communicating float chamberExaminersPrimary: Artis, Henry K.Attorney, Agent or FirmAbstractApparatus to maintain the desired water level in a swimming pool includes a stilling chamber receiving pool water from an equalizer pipe connected to the pool essentially below the desired water level. The stilling chamber is located externally of the swimming pool at the same general elevation as the desired water level so that a water level detector in the stilling chamber will open a valve in a water supply line to supply make-up quantities of water to the swimming pool to maintain the desired water level therein. In one form, the detector includes a plurality of probes extending downwardly within a secondary stilling chamber member located within the main stilling chamber. A relay unit receives an electrical signal when the detected water level falls below a desired water level to open a solenoid-operated valve located in the water supply pipe. In the second embodment, a valve assembly in the stilling chamber is mechanically operated by a float connected by a control arm to the valve assembly. | |
