Device for locking an electronic equipment housing on a tray

A device for locking an electronic equipment housing having a vertical front wall on a horizontal tray, said device comprising a moving carriage adapted to be connected to the front wall of the housing, a threaded shaft along which the carriage moves, a hinged pin fixed perpendicularly to one of the ends of the threaded shaft, and a fork disposed beneath the tray and provided with two parallel inclined slots which extend downwardly and forwardly towards said front wall in which the hinged pin is displaced, and wherein each said slot has a top end and a bottom end, the improvement comprising first and second horizontal, parallel stop notches at said top end extending respectively forwardly toward said front wall and rearwardly away from said front wall, and wherein said slots at said bottom end includes a third horizontal stop notch extending horizontally toward said front wall, such that with said hinged pin fast within said first stop notch, the shaft is held fast in a horizontal position during housing installation, with said hinged pin fast within said second stop notch, said shaft is held fast in a horizontal position while the housing is being removed, and with the hinged pin fast within said third stop notch the shaft is in an inclined position permanently pressing the housing against the bottom of the tray.