Abstract: A device includes a first unit and a second unit. The first unit comprises a first C-shaped portion, a first bridge portion, and a first U-shaped portion. The first U-shaped portion comprises a first projection extending therefrom. The second unit comprises a second C-shaped portion, a second bridge portion, and a second U-shaped portion. The second U-shaped portion comprises a second projection extending therefrom. The first projection interlocks with the second projection when the first C-shaped portion and the second C-shaped portion are fastened to a plate.

Abstract: Generally, this disclosure enables various technologies for directed illumination. For example, this disclosure enables a sign (e.g., an electronic billboard) having a louver board with a plurality of brims and a plurality of channel groups, where the brims one-to-one shade the channel groups.

Abstract: A device includes a first unit and a second unit. The first unit comprises a first C-shaped portion, a first bridge portion, and a first U-shaped portion. The first U-shaped portion comprises a first projection extending therefrom. The second unit comprises a second C-shaped portion, a second bridge portion, and a second U-shaped portion. The second U-shaped portion comprises a second projection extending therefrom. The first projection interlocks with the second projection when the first C-shaped portion and the second C-shaped portion are fastened to a plate.

Abstract: A fastener is disclosed for use in a display structure that includes a bracket defining a detent, a pin that is rotatably received by the bracket, and a latch, e.g., a helical spring, that is in engagement with the pin such that rotation of the pin causes corresponding rotation of the latch. The latch is configured, dimensioned, and positioned for engagement with the detent during movement of the fastener between first (unlocked) and second (locked) positions. During movement of the fastener between the first and second positions, the latch traverses the detent to provide a perceptible indication, e.g., an audible and/or tactile indication, that the fastener has been moved between the first and second positions.

Abstract: An electronic sign includes a planar lighting module emitting visible light. A cabinet supportingly engages the lighting module. An air chamber is between the cabinet and the lighting module. A vertical partition is within the air chamber and extends between a bottom wall and a top wall of the cabinet, and between the lighting module and a rear wall of the cabinet. The partition divides the air chamber into first and second sections. An electric fan is within the cabinet and transfers air from the first to the second section. The cabinet and/or the lighting module include a plurality of throughholes fluidly interconnecting the air chamber to ambient air. A first subset of the throughholes are more closely fluidly connected to the first section than to the second section. A second subset of the throughholes are more closely fluidly connected to the second section than to the first section.