Patent ID: 8714291

Claim:
A cleaning machine having two front wheels and two rear wheels supporting a chassis, the chassis having a central spine, the cleaning machine including a first electrical cell for propelling the cleaning machine, said first electrical cell being positioned between one of the front wheels and one of the rear wheels and outboard of the central spine in which the rear wheels are connected by a beam axle and the beam axle being connected to the central spine, the connection of the beam axle to the central spine including a single, elongate trailing arm pivotally connected, at a forward part thereof, to the central spine at a pivot connection, said first electrical cell being positioned on a right hand side of the cleaning machine, the cleaning machine including a second electrical cell for propelling the cleaning machine, said second electrical cell being positioned between one of the front wheels and one of the rear wheels and outboard of the central spine on a left hand side of the cleaning machine, the first electrical cell and the second electrical cell defining a gap therebetween within which is positioned a part of the central spine, the forward part of the single trailing arm, and the pivot connection.