Holder for magnetic discs

摘要

A container for a magnetic data recording disc includes a flat cassette shaped for insertion into a receptacle of disc memory of a data processing apparatus. A normally closed opening in a sidewall of the cassette provides access to the disc for recording and/or reading heads of the data processing apparatus. The cassette includes a pair of generally parallel walls that extend in a direction generally parallel to faces of the disc. One of the opposing walls includes an opening for enabling rotary drive means of the apparatus to be coupled to an annular hub of the disc. The opposed walls are rigid, but elastically deformable. In a free state, the opposed walls are outwardly convex. An internal projection extends from the center of the other opposed wall. The projection has an annular bearing surface facing the inside face of the other wall. The one opposing wall has an opening coaxial with the projection. The opening is surrounded by an annular bearing surface on the outside face of the one wall. The disc includes an annular hub carrying two axially displaced flanges. The flanges respectively extend internally and externally of the hub and are arranged to engage the bearing surfaces of the projection and the other wall. The flanges are axially spaced from each other by a smaller distance than the bearing surfaces in the free state of the cassette opposing walls. Thereby, when the disc is not engaged by the drive means of the apparatus, an elastic restoring force from the opposed walls, while they are in a flattened state, mechanically holds the disc in position. The disc is released from the bearing surfaces in response to the opposed walls being moved closer together by a pressure member and stops of the apparatus.