An ambulance cot loading and unloading device which utilizes an elongate guide track configured for mounting to a floor surface of a cargo area on the ambulance. A trolley is supported for movement relative to the guide track and has an elongate boom. The ambulance cot has a powered collapsible and extendable...http://www.google.es/patents/US7478855?utm_source=gb-gplus-sharePatente US7478855 - Ambulance cot loading and unloading device
