US Patent 7398571 Ambulance cot and hydraulic elevating mechanism therefor

An ambulance cot is disclosed and the ambulance cot having a base frame configured for support on a surface, a litter frame configured for supporting thereon a patient and an elevating mechanism interconnecting the base frame and the litter frame and configured to interconnect the litter frame and the base frame in order to facilitate movement of the base frame and the litter frame toward and away from each other. A control mechanism is provided on the cot which is configured to facilitate the movement of the base frame and the litter frame toward each other and at differing speeds predicated on at least one of whether the base frame is supported on the surface and the litter frame is supported by an external support separate from the elevating mechanism.