Abstract: A half-rack electronics cabinet coupled to a wall mount by two doubly-nested four bar mechanisms that are operable to articulate the cabinet by ninety degrees to bring the back planes of any installed electronic modules to the top for easy access. The function of admitting outside signal and power cables is apportioned to the wall mount. The unit is compact, as the wall mount is no wider than the cabinet. For a half-rack cabinet of sufficient height, crossbars are provided that enable vertical mounting of full-rack electronic modules in the half-rack cabinet along with, preferably, at least one half-rack module.

Abstract: Crossbars span the width between two opposed vertical attachment bars in a half-width electronics rack or cabinet of accommodating height to enable vertical mounting of full-width electronics module in the half-width electronics rack or cabinet. The crossbars are used in opposed spaced-apart pairs with the full-width electronics module mounted vertically between the crossbars. Each crossbar includes a flat elongated main bar having five sets of three holes in a linear array, with the holes sized and spaced apart in accordance with industry standards for electronics racks. An attachment flange with a fastener opening extends from each end of the main bar and is delineated from the main bar by a notch. Between the notches, the same edge extends in a right-angle bend which further extends into a flange. Crossbars are provided in pairs, with or without packaging, racks, cabinets, and electronics modules.

Abstract: A manually operated flip dog mountable ceiling speaker enclosure, for ceiling or other panel installation, provides a plurality of flip dogs mounted tangentially on an annular flange around an opening of a speaker can and operated by either pulling on an actuator to create a cam-driven rotation to a radial alignment and a downward dog movement to a ratcheted clamping position, or by first rotating the manual actuator to rotate the dog and then pulling the actuator to pull the dog down into a ratcheted clamping position. Ratchet points on the dog are urged into ratchet points on a wall by a releasable biasing member. Three embodiments are illustrated.

Abstract: A presentation audio system with two dual-mode, dual-channel, wireless IR microphone/controllers that concurrently transmit multiplexed audio and command IR signals to IR sensors communicating to an amplifier that sends amplified audio to one or more speakers, responsive to the received commands. Each wireless IR microphone/controller includes a microphone and controller in a housing with manual controls and separate redundant groups of transmitting IR LEDs. The amplifier is controlled as to volume, audio sources selected, and control closure operation. First mode controls the audio of the IR microphone/controller that is set in the first mode and second mode controls all audio sources in the system. One manual control is a control closure that may be used to initiate a building alarm or for other purposes. A headset microphone jack enables use of the IR microphone/controller as an IR transmitter. A dual recharger usable vertically or horizontally is included.