| 摘要 |
An elongated upper housing portion is selected having top and bottom sides and, displaced towards opposite ends thereof, a substantially circular portion and a fluid inlet throat portion. A fluid driven waterwheel and a brush mounting adaptor are rotatably mounted on the bottom side substantially at the circular portion. The waterwheel and brush mounting adaptor are coupled together in driving relation with the brush adaptor facing away from the bottom side. A plastic lower housing portion is mounted in overlapping and opposed relation to the bottom side of the housing at the inlet throat portion leaving the circular portion exposed. A fluid passage is provided between the upper and lower housing portions for delivery of fluid to the waterwheel. A tubular coupling is passed around the upper and lower housing portions at the inlet throat portion. First mechanical locking means between at least one of the housing portions and the coupling is interlocked for securing the coupling, the upper housing portion and the lower housing portion together. A separate substantially ring shaped plastic brush base is mounted on the upper housing portion overlapping the circular portion. A second mechanical locking means is interlocked between the upper housing and the fixed brush base for securing the fixed brush base to the upper housing.
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