An ambulance cot is provided having a wheeled carriage, a frame for mounting the wheels, a horizontally oriented patient litter supported from the wheeled carriage and variable, pneumatically powered height scissors frame. The pneumatic actuator is designed to give a patient air-ride transportation and...http://www.google.com.tw/patents/US7124454?utm_source=gb-gplus-share專利 US7124454 - Pneumatic cot for use with emergency vehicles
