Automatically adjustable floating cleaner head

Abstract From the Canadian patent

A floating cleaner head used with a self-propelled front wheel drive floor cleaning apparatus such as a, vacuum cleaner. Both the forwardly located drive wheels and the drive transmission therefor are pivotably mounted on a bracket beneath the cleaner head. A skid plate attached to the bracket extends rearwardly from the bracket pivot to sense the carpet pile height of a floor to be cleaned. As the pile height increases, the bracket is pivoted so as to force the drive wheels deeper into the carpet pile which increases the propelling force. Additionally since, the drive wheels and transmission are located intermediate freely-rotatable rear wheels and a forwardly located rotary brush and …