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

The University of Phoenix Stadium retractable roof is comprised of two low-profile panels that are driven along a parallel rails on either side of the stadium bowl. A lateral release system was required that would accommodate relative movement between the fixed building structure and the retractable roof caused by wind, thermal expansion and other structural forces. The limited vertical space between the roof panel and the fixed building structure made previously designed lateral release systems unusable. Linear bearings on the west side of the stadium are connected to the retractable roof at both ends of the guide shaft. Each guide shaft is encased in a movable collar mounted to the transporter, which allows for 36 inches of relative movement between the roof panels and the transporters. This allows the wheels on both sides of the roof to stay engaged with the rails regardless of relative lateral movement.