| 摘要 |
Rotary brush 1, mounted on shaft 2, is drivable selectively in one direction and then in the opposite direction by means of a motor (not visible) accommodated in a housing 3. The motor, which is mains powered by way of plug 6 and lead 5 (but may be battery- powered), is manually controlled by a switch 4 which can be displaced axially of the housing 3 through an intermediate zero position. In a development, circuitry may be included for controlling the motor to rotate alternately in the two directions, each time by a predetermined number of rotations, which may be adjusted; furthermore, the shaft 2 may be a flexible drive shaft. <IMAGE> |
