E - Fixed Constructions – 04 – H
Patent
E - Fixed Constructions
04
H
135/0.1
E04H 4/06 (2006.01)
Patent
CA 1174554
ABSTRACT A flat, elongated cover for a pool having a bottom and side walls, the pool containing a liquid, is substantially rigid and has a side facing the liquid and an opposite side facing away from the liquid when the cover is in a floating position on the liquid. The cover defines at least one elongated cavity extending in the direction of elongation of the cover, each cavity having a single flooding opening facing, and in free communication with, the liquid, the flooding opening being arranged in the region of one end of the cavity for flooding the cavity, a venting port arranged in the region of an end of the cavity opposite to the one end, a vent valve for closing and opening the venting port, and a connection to a source of a gas under pressure leading to the cavity for selectively supplying the gas under pressure to the cavity. The mass of the cover in addition to that of the liquid flooding the cavity exceeds the mass of the liquid to be displaced. The cover will gradually sink to the bottom when the liquid floods the cavity through the single flooding opening at the one end after the vent valve has been opened to permit the gas under pressure to escape through the venting port at the opposite end, the cover assuming an oblique position while it sinks as the liquid gradually floods the cavity from the one to the opposite end, and the cover will gradually rise in a like manner when the gas under pressure is supplied to the cavity and gradually displaces the liquid in the cavity through the opening at the one end.
381409
Sernetz Heinz
Swabey Ogilvy Renault
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