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A high-stability composable case of the type comprising a thermoformed element made of plastic material consisting of a central panel ( 12 ) having a quadrilateral shape, the sides of which are connected, by means of fold-inviting lines ( 17, 18 ), to four sides of side panels ( 13, 14, 15, 16 ), wh

A high-stability composable case of the type comprising a thermoformed element made of plastic material consisting of a central panel ( 12 ) having a quadrilateral shape, the sides of which are connected, by means of fold-inviting lines ( 17, 18 ), to four sides of side panels ( 13, 14, 15, 16 ), which may be folded, in a box-like manner, on the central panel ( 12 ), there being provided corner elements for forming and blocking ( 25 ) between the central panel and the side panels, where the side panels are equipped with flap-like edges ( 20, 21 ) which protrude outwards with respect to the side panels ( 13, 14, 15, 16 ) and which can be set alongside one another in a closed box-like position of the case to be inserted two by two within a slit ( 37 ) of each corner element for forming and blocking ( 25 ), in which the flap-like edges ( 20, 21 ) provide longitudinal and transverse elements for engagement and connection ( 23, 27; 29, 30; 31, 32 ) designed to bring about a stable reciprocal positioning between the flap-like edges ( 20, 21 ).

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1. A high-stability composable case of the type comprising a thermoformed element made of plastic material consisting of a central panel ( 12 ) having a quadrilateral shape, the sides of which are connected, by means of fold-inviting lines ( 17 , 18 ), to four sides of side panels ( 13 , 14 , 15 , 1

1. A high-stability composable case of the type comprising a thermoformed element made of plastic material consisting of a central panel ( 12 ) having a quadrilateral shape, the sides of which are connected, by means of fold-inviting lines ( 17 , 18 ), to four sides of side panels ( 13 , 14 , 15 , 16 ), which may be folded, in a box-like manner, on said central panel ( 12 ), there being provided corner elements for forming and blocking ( 25 ) between said central panel and said side panels, where said side panels are equipped with flap-like edges ( 20 , 21 ) which protrude outwards with respect to the side panels ( 13 , 14 , 15 , 16 ) and which can be set alongside one another in a closed box-like position of said case to be inserted two by two within a slit ( 37 ) of each corner element for forming and blocking ( 25 ), said composable case being characterized in that said flap-like edges ( 20 , 21 ) provide longitudinal and transverse elements for engagement and connection ( 23 , 27 ; 29 , 30 ; 31 , 32 ) designed to bring about a stable reciprocal positioning between said flap-like edges ( 20 , 21 ). 2. A composable case according to claim 1, characterized in that said longitudinal elements for engagement and connection on said flap-like edges comprise, on one side, longitudinal ribs ( 29 ) and, on the other side, longitudinal grooves ( 30 ) designed to receive said ribs ( 29 ). 3. A composable case according to claim 1, characterized in that said transverse elements for engagement and connection on said flap-like edges comprise, on one side, transverse projections ( 31 ) and, on the other side, transverse housings ( 32 ) designed to receive said projections ( 31 ). 4. A composable case according to claim 1, characterized in that said central panel ( 12 ) is provided at each corner ( 19 ), in its internal part, with elements for stabilization ( 33 ) during structural assembly of said case. 5. A composable case according to claim 4, characterized in that said stabilization elements are made up of at least two protruding teeth ( 33 ) with their top surfaces ( 34 ) inclined towards the outside of said central panel ( 12 ). 6. A composable case according to claim 5, characterized in that said two protruding teeth ( 33 ) are shaped like an equilateral triangle and are brought up together along one of their sides set facing to define a channel ( 35 ) between them. 7. A composable case according to claim 1, characterized in that each corner element for forming and blocking ( 25 ) comprises a pair of hollow tubular portions ( 36 ) set at a distance apart to identify a vertical slit ( 37 ) defined by two vertical walls ( 38 ). 8. A composable case according to claim 1, characterized in that said hollow tubular portions ( 36 ) set at a distance apart are closed.