Patent ID: 7409734

Claim:
A pneumatically powered lift ambulance cot comprising: a wheeled lower frame having a first slide member slidably supported by a longitudinally extending lower guide; an upper frame having a second slide member slidably supported by a longitudinally extending upper guide, said upper frame is disposed above said wheeled lower frame; a support mechanism which supports said upper frame relative to said wheeled lower frame, said support mechanism is pivotally connected to said upper frame, said wheeled lower frame, said first slide member, and said second slide member; a pneumatic lift mechanism pivotally mounted at a first end to said first slide member, and at a second end to said support mechanism; an air cylinder releasably mounted to said cot to supply air pressure to the pneumatic lift mechanism in order to assist relative movement between said upper frame and said wheeled lower frame; and an arresting device releasably arresting movement of said second slide member along said upper guide to permit adjustments of a vertical position of said upper frame with respect to said lower frame with or without assistance from the lift mechanism.