| 摘要 |
A floor treating machine includes an electric motor, batteries free from leakage and mounted on a motor deck for supplying a current to the electric motor, a rotary shaft extending vertically and driven by the electric motor, and a floor treating device, such as a brush or sponge, detachably attached to a lower end of the rotary shaft to be rotatable therewith. The floor treating device contacts a floor and supports the machine during a floor treating operation. The electric motor is connected to the batteries through an on/off switch. The floor treating machine further includes a rotating rate varying device operable upon start of the electric motor for gradually increasing a rotating rate of the electric motor to reach a predetermined operational rotating rate after lapse of a predetermined time.
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