The invention concerns a structural and mechanical means to build a large retractable roof, that can have the shape of a barrel vaulted roof or a pitched vaulted roof or a flat roof. The roof is moved as one monolithic roof on and off a mall walkway or other structure. The roof cover is a glass skylight or other material.

A stadium that is adapted for open use during good weather as well as for covered use during poor weather includes a foundation and a pair of movable end roof members that are movable between first, retracted positions and second, operational positions for covering first and second end areas, respectively, of the stadium. The stadium also includes a center roof member that is movable between a retracted position and an operational position for covering a center area of the stadium. All of the roof members are supported for movement between the retracted positions and the operational positions by a guide and support assembly that includes at least one rail member that is secured to the foundation and a plurality of independently suspended follower assemblies that are mounted to the respective roof member. Each of said follower assemblies include a wheel member that is positioned in contact with the rail and a resilient member that is interposed between the wheel member and the roof member, so that each of the wheel members is independently suspended with respect to the other wheel members. This creates a number of advantages, including that it makes alignment easier to achieve and maintain, and that it allows the guide and support assembly to be constructed with a large number of small wheels and to have a relatively low profile, which makes the system attractive from both an aesthetic and a structural standpoint.

An edifice such as a sports stadium is adapted for open use during good weather as well as for covered use during poor weather by having at least one movable roof member. Each movable roof member includes a transport mechanism that is constructed and arranged to permit the roof member to move in a predetermined path with respect to the underlying structure of the edifice. The transport mechanism includes structure for supporting both ends of the roof member, which bridges an otherwise open area of the edifice. In order to permit some flexure and movement of the roof member with respect to the underlying edifice, as will inevitably occur as a result of natural forces such as winds, orientation structure is provided for maintaining the transport mechanism in a predetermined orientation while simultaneously permitting a limited amount of movement of the roof member in a direction that is nonparallel to the predetermined path of movement. The orientation structure has been found to be most effective when it is provided at but one end of the roof member.

A stadium that is adapted for open use during good weather as well as for covered use during poor weather includes a foundation and a pair of movable end roof members that are movable between first, retracted positions and second, operational positions for covering first and second end areas, respectively, of the stadium. The stadium also includes a center roof member that is movable between a retracted position and an operational position for covering a center area of the stadium. All of the roof members are supported for movement between the retracted positions and the operational positions by a guide and support assembly that includes at least one rail member that is secured to the foundation and a plurality of independently suspended follower assemblies that are mounted to the respective roof member. Each of said follower assemblies include a wheel member that is positioned in contact with the rail and a resilient member that is interposed between the wheel member and the roof member, so that each of the wheel members is independently suspended with respect to the other wheel members. This creates a number of advantages, including that it makes alignment easier to achieve and maintain, and that it allows the guide and support assembly to be constructed with a large number of small wheels and to have a relatively low profile, which makes the system attractive from both an aesthetic and a structural standpoint.

A convertible stadium includes an exhibition area, a seating area and a plurality of roof support locations for supporting a movable or retractable roof assembly. The roof assembly includes a first major truss that spans a distance between a first and a second of the roof support locations and a second major truss that spans a distance between a third and a fourth of the roof support locations. Both of the first and second major trusses are preferably structurally configured as a tied arch, each of which has a generally convex upper portion and a lower portion that is adapted to assume gravity induced stresses within the trusses as tension. In order to keep the center of mass of the major trusses generally positioned within a plane including the roof support locations, which optimizes lateral stability of the major trusses, the major trusses are most preferably given a lenticular shape, meaning that the lower portion of the trusses is convex and in fact preferably generally symmetrical to the upper portion. First and second convex guide tracks are respectively mounted to the upper portions of the first and second major trusses, and a movable roof member is mounted for movement along the guide tracks. Advantageously, the guide wheels and the drive wheels on the movable roof member engage the upwardly facing and downwardly facing surfaces on the guide tracks, and are biased together so as to provide sufficient traction to be able to move the movable roof member along the guide tracks even when such movement has an upward component due to the convex shape of the guide tracks.