Floor surface treatment appliance has three wheels in a triagular arrangement and is able to turn about an axis through the centre of gravity

摘要

The floor treatment machine has a pair of steerable front wheels (11a,11b) rotatable through vertical axes (a1,a2) and a drive wheel (12) rotatable through a vertical axis (a3), the whole turning about a vertical axis through the centre of gravity (S). The brush (13) lies between the front wheels.