| 摘要 |
Traction device for a shopping trolley including a fixing pin 1 about which there freely pivots a frame 2 supporting a motor 3 driving a differential 4 by means of a worm 5 and of a gear 6. The outputs of the differential 7, supported by bearings 8, are integral with notched rollers 9 driving, by friction, the wheels 10, or with gears 11 causing gears 12 integral with the wheels to revolve. A control system made up of a ballast transistor on the base of which a reservoir capacitor supplied by a resistor, one terminal of which is connected to the positive supply by action on a push button, allows gradual stopping and starting of the motor, a relay with two reversing contacts actuated by a switch allows reversal of the direction of travel of the trolley; the device further includes a battery 20 providing it with the required electrical energy. <IMAGE>
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