A stretcher comprises a patient support area supported by front legs and rear legs. The front legs and rear legs are coupled by a gear mechanism, and an actuation device coupled to the gear mechanism effects retraction or extension of the stretcher in a smooth and continuous motion. The actuation device...http://www.google.ca/patents/US7003829?utm_source=gb-gplus-sharePatent US7003829 - Stretcher with gear mechanism for adjustable height
