Abstract: A convertible stadium includes a playing field, a seating area, a stationary roof structure and a large, heavy roof panel mounted for movement with respect to the stationary roof structure, A plurality of cable drums are mounted for movement together with the roof panel. Each cable drum has at least one cable wound thereabout. The cable is secured to the stationary roof structure and is payable from the respective cable drum. The system is designed so as to minimize movement between the cable and the roof panel, so there will be no possibility of frictional engagement therebetween.

Abstract: A 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 supporting 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, a lateral release system 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 lateral release system has been found to be most effective when it is provided at but one end of the roof member.

Abstract: A 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 supporting 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, a lateral release system 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 lateral release system has been found to be most effective when it is provided at but one end of the roof member.

Abstract: A convertible stadium includes a playing field, a seating area, a stationary roof structure and a large, heavy roof panel mounted for movement with respect to the stationary roof structure, A plurality of cable drums are mounted for movement together with the roof panel. Each cable drum has at least one cable wound thereabout. The cable is secured to the stationary roof structure and is payable from the respective cable drum. The system is designed so as to minimize movement between the cable and the roof panel, so there will be no possibility of frictional engagement therebetween.

Abstract: A post attachment device for connecting a helmet to a head and neck support. The device includes a post anchor having a base, a button, a resilient member, a post, a retainer and a catch having a slot with a larger first section connected by a channel to a smaller second section. The button is positioned in an indention in the base with the resilient member positioned therebetween. The post extends through the button, the base and the helmet. The retainer is secured on the post adjacent the inner surface of the helmet. To secure the post attachment device, the catch is orientated over the post. The button is then pressed into the base while the catch is moved backwards to move the post into the second section of the slot.

Abstract: A hitch assembly is disclosed for use with endless track land vehicles that allows an implement mounted by a three-point hitch arrangement up to about 15 degrees arcing movement off the longitudinal axis oriented in the direction of travel of the land vehicle. A pivotal mounting means is connected to two horizontal arms which are joined at the rear by another member. The mounting means and connecting arms form a four-sided polygonal structure which can be raised or lowered by a hydraulic ram since the arms are pivotally connected at the corners. Finally, a telescoping linkage assembly, after the hitch assembly has been raised through 75 percent of its travel, urges the implement mounting means on the rear vertical connecting arm into a common, pre-selected travel position.