Museum showcase with a bearing platform

A museum showcase, comprising:

• a bearing frame, fixed walls and at least one openable wall supported by the bearing frame, wherein
• the bearing frame comprises a platform which includes joints and horizontal beams structurally connected together with the joints,
• the fixed walls and the at least one openable wall are supported by the joints, the joints being configured to allow the at least one openable wall to open outwardly away from the bearing frame,
• each of said joints comprises a lower shell, an upper shell, and connecting tie rods between the lower shell and the upper shell,
• each of said joints comprises coupling seats provided on faces facing towards an outside of the showcase, wherein each of said coupling seats comprises an upper shaped channel formed on the upper shell and a lower shaped channel formed on the lower shell, wherein the upper and lower shaped channels are aligned with each other;
• and
• a bar inserted in the upper and lower shaped channels of each of said coupling seats, wherein at least one threaded hole is formed in the bar;
• wherein the fixed walls and the at least one openable wall are supported by the joints by fastening to the threaded hole through gaps in said coupling seats.