| 摘要 |
The invention comprises a simple compact automatically operating apparatus for cleaning swimming pools in a stepwise movement over the pool walls comprising a balanced operating head having an inlet and an outlet, the outlet adapted to be swivelably connected to a longitudinally resilient and flexible suction hose. The inlet axis is inclined at an angle of between thirty degrees and sixty degrees to that of the outlet. A pair of passages extend through the head from inlet to outlet, and an oscillatable valve in the head is adapted to alternately close said passages. A baffle plate is placed in the head between the inlet and valve to cause one of the passages to be more restricted and less direct between inlet and outlet than the other and the valve is shaped so that liquid flow through the passages will cause automatic oscillation thereof between terminal positions in each of which one of the passages through the head is closed.
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