located rearwardly of the center axis of the brush 321 such that the center of gravity of the rear deflector 381 is located far enough behind arms 382 to urge the lower portion of front lip 381a against the brush 321 for positive contact with brush 321 the lower portion 381a is spaced a small distance for example 1 34 or 11 2 34 above the floor or surface being cleaned while the remainder of the deflector extends predominantly upwardly and rearwardly the upper edge portion of deflector 381 freely bears against the housing rear wall 324 at a position above the center axis of the brush 321 deflector 381 has rods 381b attached to its upper and outer corners the rods 381b extend upwardly and outwardly the rods 381b are aligned with arms 382 and prevent the upper portion of the deflector 381 from pivoting about members 384 to a position where the upper portion of deflector 381 bears against the brush 321 in other words the rods 381 contact arms 382 if the upper portion of deflector 381 is moved away from wall 324 arms 382 are slightly angled so that even when the deflector lip 381a is against the smallest brush periphery the center of mass of the deflector is behind the pivot axis of pins 384 this causes the deflector to pivot on pins 384 to a position where the deflector upper portion bears against the rear wall 324 the operation of sweeper 310 is generally similar to.