Abstract: The storage device comprises a plurality of identical trays (1, 2) substantially parallelepipedal in shape and open at the upper and front sides. The trays can be nested, stacked on top of one another and suspended below a horizontal supporting element. The device comprises removable U-shaped connecting members (3, 4, 5) and locking elements (17, 18, 19, 20) integral with the lower and upper ends of the wings of the front frame (10) of the tray (1, 2), so that the stacking in a secure manner of two trays (1, 2) is performed by means, on the one hand, of the elements for locking the two front frames which cooperate with one another and, on the other hand, of the removable connecting members inserted between the rear parts of the walls of the trays.

Abstract: A releasable coupling comprises a female component providing an open ended sleeve and a male component having a projection for insertion into this sleeve, said projection comprising an enlarged hook formation or detent connected by thinner resilient connecting members to the body of the male part. The form of the components is such that said projection can be inserted through said sleeve, the hook formation, on emerging from the end of the sleeve opposite that from which it was inserted springing resiliently, due to said connecting members, in a transverse direction perpendicular to the insertion direction to bring an abutment face on the hook formation into opposition with an abutment at the end of the sleeve opposite the end from which the said projection was inserted so that the components can thereafter be uncoupled only after displacing the hook formation in the direction opposite to said transverse direction.