Abstract: The invention relates to a mechanical storage installation in which the vertical axis of the elevator shaft orthogonally intersects the axis of the horizontal rolling tracks receiving the series of storage carriages. In this storage the elevator comprises at least a guide structure located outside the horizontal rolling tracks and a mobile device driven reciprocably along this vertical structure, this mobile device carries at least a retractable comb located in its active position inside the rolling tracks and in its inactive position outside of them, and the comb is connected to the mobile device by a single connection, which, during active vertical movements of the comb, traverses the horizontal rolling tracks by passages provided in these latter.