| 摘要 |
A water pump includes a pump stand and a spout mounted on the stand for communication with its interior. A rotary drive shaft supported by the pump stand extends downwardly to an underground water supply. A pump rotor supported by the drive shaft is positioned within a stator communicating with the water supply, for cooperating to pump water to the pump stand and the spout. An input shaft applies a rotary driving motion to a gear box mounted on the pump stand, which in turn applies a rotary driving motion to the drive shaft. The gear box includes first and second bevel gears mounted on the input shaft in a spaced apart relation. A first clutch permits relative rotary motion in a first direction between the input shaft and the first gear while prohibiting relative rotary motion in a second direction. A second clutch permits relative rotary motion between the input shaft and the second bevel gear in the second direction, while prohibiting relative rotary motion in the first direction. A third bevel gear, mounted fast on the drive shaft for driving contact with the first and second bevel gears, is rotated in a common direction by rotation of the input shaft in either the first or second direction.
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