Patent ID: 9635990
Date: 2017-05-02
CPC Classifications: A47L

Claim:
1. A floor cleaning or burnishing machine comprising: a pivot suspension, comprising: at least two separate rear drive wheels; a channel having two ends and axially extending across a rigid frame of a floor cleaning or burnishing machine, wherein a first of the rear drive wheels is rotatably attached to a first end of the channel and a second of the rear drive wheels is rotatably attached to a second end of the channel; and a pivot rod disposed in line from front to rear of the floor cleaning or burnishing machine, pivotably connected to the ridged frame of the floor cleaning or burnishing machine, and fixedly attached to the channel at a location between the two ends of the channel, so that the rear drive wheels are in a pivotable relationship with the ridged frame of the floor cleaning or burnishing machine.