Drive Systems Traction Drive Cable Drive Rack-and-Pinion Drive Jackscrew Drive Belt Drive Stress Release Systems Four-Bar Linkage Hinge Bearing Linear Bearing Independent Suspension Linkage Suspension Control Systems Local Control Computer Control

Three independent, parabolic panels compromise the retractable roof at Minute Maid Park in Houston. The system includes eight trusses, some as large as 600 ft. by 50ft., and all are subjected to a variety of thermal and wind forces. A structural hinge at the top of the west wall allows the roof sections to flex to accommodate an almost endless combination of geometries.