A patient support including a propulsion device for moving the patient support. The patient support includes a propulsion system having a propulsion device operably coupled to an input system. The input system controls the speed and direction of the propulsion device such that a caregiver can direct...http://www.google.sh/patents/US6877572?utm_source=gb-gplus-sharePatent US6877572 - Motorized traction device for a patient support
