Patent ID: 7905306
Filing Date: 2011-03-15
Classification: A47C,A47K,A61G,A61H,B66B,Y10S

Abstract:
1. A person support apparatus comprising a frame, a seat supported on the frame, at least one drive roller having a spherical surface, the drive roller supporting a portion of the frame and engaging a surface supporting the person support apparatus, a first driver including a first motor and a first drive wheel driven by the first motor, the first drive wheel engaged with the surface of the drive roller such that the first driver drives the drive roller in first and second directions about a first axis parallel to the surface supporting the person support apparatus, a second driver including a second motor and a second drive wheel driven by the second motor, the second drive wheel engaged with the surface of the drive roller such that the second driver drives the drive roller in first and second directions about a second axis parallel to the surface supporting the person support apparatus, the second axis not parallel to the first axis, and a controller controlling the speed and direction of the first and second drivers to control the movement of the person support apparatus over the surface.