Abstract: A sleeve block includes a frame that is connectable to an object, such as a truss, that is to be moved relative to a stationary support. An axle defining a longitudinal axis and a motor are to the frame. The sleeve block includes a line that has a first end connected to the motor. The line extends downward from the motor around at least a portion of the axle and then extends outwardly of the frame so that at least a portion of the line is operatively connected to the stationary support. The portion of the line between the axle and the stationary support creates a line axis, and the motor is spaced apart from the line axis. Activation of the rotatable output of said motor causes the frame and the object to move relative to the stationary support by retracting or extending the line from the motor.

Abstract: A sleeve block includes a frame that is connectable to an object, such as a truss, that is to be moved relative to a stationary support. An axle defining a longitudinal axis and a motor are to the frame. The sleeve block includes a line that has a first end connected to the motor. The line extends downward from the motor around at least a portion of the axle and then extends outwardly of the frame so that at least a portion of the line is operatively connected to the stationary support. The portion of the line between the axle and the stationary support creates a line axis, and the motor is spaced apart from the line axis. Activation of the rotatable output of said motor causes the frame and the object to move relative to the stationary support by retracting or extending the line from the motor.

Abstract: A large screen display drive mechanism. A drum is rotatably mounted to a truss by an axle that extends centrally through the drum and mounted by bearings, in turn, mounted to the truss. A large screen display is wrappable on the drum and is electrically connected by a cable assembly extending through the drum and outwardly thereof through a sprocket fixedly mounted to an end of the drum. The cable assembly is wrapped around a portion of the axle extending outwardly of the drum. A motor with sprocket and chain drives the sprocket attached to the drum.

Abstract: A large screen display drive mechanism. A drum is rotatably mounted to a truss by an axle that extends centrally through the drum and mounted by bearings, in turn, mounted to the truss. A large screen display is wrapable on the drum and is electrically connected by a cable assembly extending through the drum and outwardly thereof through a sprocket fixedly mounted to an end of the drum. The cable assembly is wrapped around a portion of the axle extending outwardly of the drum. A motor with sprocket and chain drives the sprocket attached to the drum.

Abstract: A wheeled truss that is convertible into a truss with a catwalk. A carriage is removably mounted to the bottom of the truss for transporting the truss to the performance site. The carriage is removed from the truss, inverted and mounted to the top of the truss forming with the truss a catwalk.

Abstract: A foldable truss having a pair of side frames hinged together by a foldable arm allowing the truss to be collapsed to a smaller width while maintaining the truss length as a constant.

Abstract: A foldable truss having a pair of side frames hinged together by a foldable arm allowing the truss to be collapsed to a smaller width while maintaining the truss length as a constant.

Abstract: The portable display unit carried by a person for displaying a message at an elevation above the person. A media player, inverter, and screen power supply are mounted within a backpack having a video screen mounted above and to the backpack. The backpack includes a hip-circling belt carrying a power supply.