down flexible hinge part 70 the opposite end of knee lever 68 is provided with a pin 72 which is free to slide in the gap between rear inside wall 62 and a guide shaft 74 extending parallel to that wall pin 72 is subject to the force exerted transversely with respect to the direction in which the tray is ejected of a helical compression spring 76 held between inside wall 62 and guide wall 74 as can be seen from fig5 locking lever 32 in its normal position rests laterally against the completely inserted tray 22 and a locking projection 78 engages with front edge 80 of the tray by which means the tray is locked in placed and prevented from moving outward when actuating element 24 on the forward end of locking lever 32 is actuated the element is pulled slightly outward together with the forward end of the actuating lever until locking projection 78 releases front edge 80 at this moment a hook 82 projecting outward from the forward end of locking lever 32 snaps into a mating hook 84 this hook is rigidly connected to the housing projects inward from the housing and forms a retaining device for the forward section of locking lever 32 in this way locking lever 32 is held temporarily in the unlocked position the forward directed force exerted on locking lever 32 required for hook 82 to snap firmly into mating hook 84 is provided by leaf spring 60 supported on rear inside wall 62 when locking lever 32 is held in its unlocked position tray 22 is released for its outward movement at.