| 摘要 |
The present invention relates to pool cleaning apparatus of the type incorporating a hose for feeding water to a cleaning head for cleaning the bottom of a swimming pool utilising the water from the pool and a method of selectively raising and sinking the hose of the pool cleaning apparatus. In particular, the apparatus comprises a hose for placement in the pool and directing the water from a pump to the cleaning head, the hose having an inlet end for entry of the water into the hose and an outlet end for passage of the water from the hose to the cleaning head. The hose is adapted for being raised in the pool by an increase in buoyancy caused by an increase in pressure of water in the hose with flow of the water along the hose to the cleaning head, and for sinking in the pool upon the pressure of water in the hose being reduced. Accordingly, the hose of the pool cleaning apparatus may be raised by pumping water along within the hose toward the cleaning head to thereby cause the increase of buoyancy and be caused to rink in the pool by reducing the pressure of the water in the hose to thereby reduce the buoyancy.
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