| 摘要 |
A pool cleaning device comprises a housing defining a chamber therein having a rudder and an air injector. When air is injected into the chamber, the housing rises from the pool bottom to the surface. The device further includes a float valve which causes the air in the chamber to escape when the device reaches the surface of the water. The housing has a port communicating with the water in the pool for letting in water to replace the air escaping through the float valve, causing the device to sink to the pool bottom after the air has been released from the chamber. The rudder causes the housing to move laterally during its ascent and descent. A brush attached to the housing scrubs the side wall and bottom of the pool. The ascent and descent of the device also causes the rudder to operate a gear mechanism causing the housing to rotate relative to the pool, thereby ensuring that the device will move laterally in different directions to cover the entire pool and to retrieve itself from corners.
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