US Patent 7191854 Self propelled gurney and related structure confidential and proprietary document

A modular drive unit for a gurney including a control/handle module, a cord reel/charger module, a drive module, and a chassis assembly, plus all needed electrical wiring harnesses and pneumatic tubing to connect them. The modules mount to any existing gurney and to each other without making permanent modifications to the gurney. The gurney is controlled by a handle assembly containing all necessary controls and indicators to allow the operator to select forward or reverse direction, increase or reduce speed of travel, observe the state of battery charge, and energize or deenergize power from the various modules. In addition, the handle may be swung down through 180 degrees to facilitate loading and unloading the gurney.