Combined casing and operational support for a pocket calculator

A casing for a pocket calculator or a similar apparatus having a visual display, said casing comprising a rectangular bottom and a rectangular cover suitable for the size of said pocket calculator and having raised side walls so as to enclose the pocket calculator completely in a closed condition of the casing, said bottom and said cover being connected through a hinge joint at one of their shorter sides, said cover comprising a first part located close to said hinge joint, and a second part having a greater length than the first part and being connected therewith through a further hinge joint, the axis of which is parallel to that of the first-mentioned hinge joint, the side walls of the cover and the bottom extending along said one short side being oblique and allowing the cover to be turned to an extreme position in which the cover projects below the bottom, said further hinge joint allowing the second cover part to be turned relative to the first cover part in the same direction as the turning of the first cover part relative to the bottom allowed by the first-mentioned hinge joint, mutually co-operating interlocking means being provided at the shorter side of the upper side of the cover opposite the first-mentioned hinge joint and in the underside of the bottom for securing the second cover part relative to the bottom after turning of the two cover parts in said hinge joints.