Abstract: An apparatus for rack mounting electronic components includes a frame structure defining a storage compartment having a front access opening and a pair of rack rails pivotally mounted to opposite sides of the frame structure for movement between a retracted position in which the rack rails lie entirely within the frame structure and an extended position in which the rack rails project out from the frame structure. Connected between the rack rails and the sides of the frame structure are slide members which are capable of locking the rack rails at the extended position and at a number of discrete angular positions intermediate the extended and retracted positions. With electronic components mounted to the rack rails, pivoting the rack rails from the retracted position to the extended position will provide access to the rear panels of the these components to facilitate the completion of electrical interconnections and maintenance and repair procedures.