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.sh/patents/US20080290679?utm_source=gb-gplus-sharePatent US20080290679 - Method of unloading an ambulance cot into an ambulance
