Liquid purification or separation – Structural installation – Closed circulating system
Patent
1990-05-10
1991-11-26
Dawson, Robert A.
Liquid purification or separation
Structural installation
Closed circulating system
210232, 210345, 210291, 210293, B01D 3531
Patent
active
050680331
ABSTRACT:
An underdrain assembly contained within a swimming pool filter has a plurality of laterals, each of which is pivotable between a non-operating position and an operating position. Each of the laterals is threadedly attached to the underdrain assembly so that they can be replaced individually by unscrewing them from the underdrain assembly without removing the underdrain assembly from the filter. The laterals can be locked in their operating positions by either a reversible locking mechanism or an irreversible locking mechanism. With the laterals in their non-operating positions, the underdrain assembly and the laterals can be inserted into the filter as a unit.
REFERENCES:
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patent: 3625365 (1971-12-01), Armstrong et al.
patent: 3647083 (1972-03-01), Niccum et al.
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patent: 4169793 (1979-10-01), Lockshaw
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patent: 4753726 (1988-06-01), Suchanek
patent: 4941975 (1990-07-01), Schewe
Hazlehurst Fred T.
Tobias Samuel
Dawson Robert A.
Drodge Joseph
Hayward Industries, Inc.
Selitto, Jr. Ralph W.
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