A collapsible hydraulically operated ambulance cot having a support frame, a wheeled base, a support mechanism disposed therebetween, and a lift system for hydraulically moving the upper frame relative to the lower frame is disclosed. The lift system permits a single attendant to raise the cot from a...http://www.google.de/patents/US7996939?utm_source=gb-gplus-sharePatent US7996939 - Electro-hydraulically powered lift ambulance cot
