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System for opening and closing a structural part arranged on a support structure. The system includes at least one hinged joint device for flexibly connecting the structural part to the support structure. The at least one hinged joint device is arranged inside the support structure and has an axis o

System for opening and closing a structural part arranged on a support structure. The system includes at least one hinged joint device for flexibly connecting the structural part to the support structure. The at least one hinged joint device is arranged inside the support structure and has an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing. A locking arrangement is structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position. In the closed position, the locking arrangement is arranged to relieve the at least one hinged joint device.

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What is claimed: 1. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the suppor

What is claimed: 1. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the support structure and having an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing; a locking arrangement structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position; and the locking arrangement comprising a tightening mechanism structured and arranged to lock and unlock, with the locking arrangement, the support structure and the structural part, wherein, in the closed position, the locking arrangement is arranged inside the support structure and is arranged to relieve the at least one hinged joint device, and wherein the locking arrangement comprises a chain or belt arrangement structured and arranged to lock a first flange of the structural part to a second flange of the support structure, wherein the chain or belt arrangement is arranged radially outside and around a circumference of the first and second flanges, wherein the first and second flanges respectively comprise opposite facing stop surfaces which contact each other and rest against one another in the closed position, and wherein the first and second flanges respectively comprise first locking surfaces which face away from each other. 2. The system of claim 1, wherein the chain or belt arrangement comprises a plurality of clamp elements. 3. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the support structure and having an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing; a locking arrangement structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position; wherein, in the closed position, the locking arrangement is arranged inside the support structure and is arranged to relieve the at least one hinged joint device; the locking arrangement comprising a chain or belt arrangement structured and arranged to lock a first flange of the structural part to a second flange of the support structure; the chain or belt arrangement being arranged radially outside and around a circumference of the first and second flanges; the first and second flanges respectively comprising opposite facing stop surfaces which rest against one another in the closed position; the first and second flanges respectively comprising first locking surfaces which face away from each other; and the chain or belt arrangement comprising a plurality of clamp elements, wherein each of the plurality of clamping elements comprises second locking surfaces which interact in a form-locking manner with the first locking surfaces of the first and second flanges. 4. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the support structure and having an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing; a locking arrangement structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position; wherein, in the closed position, the locking arrangement is arranged inside the support structure and is arranged to relieve the at least one hinged joint device; the locking arrangement comprising a chain or belt arrangement structured and arranged to lock a first flange of the structural part to a second flange of the support structure; the chain or belt arrangement being arranged radially outside and around a circumference of the first and second flanges; the first and second flanges respectively comprising opposite facing stop surfaces which rest against one another in the closed position; the first and second flanges respectively comprising first locking surfaces which face away from each other; and the chain or belt arrangement comprising a plurality of clamp elements, wherein each of the plurality of clamping elements comprises second locking surfaces which engage with the first locking surfaces of the first and second flanges. 5. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the support structure and having an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing; a locking arrangement structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position; wherein, in the closed position, the locking arrangement is arranged inside the support structure and is arranged to relieve the at least one hinged joint device; the locking arrangement comprising a chain or belt arrangement structured and arranged to lock a first flange of the structural part to a second flange of the support structure; the chain or belt arrangement being arranged radially outside and around a circumference of the first and second flanges; the first and second flanges respectively comprising opposite facing stop surfaces which rest against one another in the closed position; the first and second flanges respectively comprising first locking surfaces which face away from each other; and the chain or belt arrangement comprising a plurality of clamp elements, wherein each of the plurality of clamping elements comprises second locking surfaces which sealingly engage with the first locking surfaces of the first and second flanges. 6. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the support structure and having an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing; and a locking arrangement structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position, wherein, in the closed position, the locking arrangement is arranged inside the support structure and is arranged to relieve the at least one hinged joint device, wherein the locking arrangement comprises a chain or belt arrangement structured and arranged to lock a first flange of the structural part to a second flange of the support structure, and wherein the chain or belt arrangement comprises a sliding block surface which tapers outwards and which faces towards the second flange, whereby the chain or belt arrangement expands outwardly when sliding block surface engages with the second flange. 7. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the support structure and having an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing; and a locking arrangement structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position, wherein, in the closed position, the locking arrangement is arranged inside the support structure and is arranged to relieve the at least one hinged joint device, wherein the locking arrangement comprises a chain or belt arrangement structured and arranged to lock a first flange of the structural part to a second flange of the support structure, and wherein the chain or belt arrangement comprises clamp elements having sliding block surfaces which taper outwards and which face towards the second flange, whereby the chain or belt arrangement expands outwardly when sliding block surfaces engage with the second flange. 8. A system for opening and closing a structural part arranged on a support structure, the system comprising: at least one hinged joint device for flexibly connecting the structural part to the support structure; the at least one hinged joint device being arranged inside the support structure and having an axis of rotation about which the structural part can be pivoted relative to the support structure during opening and closing; a locking arrangement structured and arranged to connect the structural part to the support structure in a form-locking manner when the structural part is in a closed position; the locking arrangement comprising a chain or belt arrangement structured and arranged to lock a first flange of the structural part to a second flange of the support structure; and a tightening mechanism for radially expanding and contracting the chain or belt arrangement, wherein, in the closed position, the locking arrangement is arranged to relieve the at least one hinged joint device, and wherein the tightening mechanism comprises a thread tightener acting between respective opposite ends of the chain or belt arrangement and a helical gear for rotating the thread tightener. 9. The system of claim 8, wherein the helical gear comprises a gear wheel and a worm wheel. 10. The system of claim 9, wherein the gear wheel is coupled to the thread tightener and the worm wheel is coupled to a drive element. 11. The system of claim 9, wherein the drive element is a hand twist grip. 12. The system of claim 11, wherein the hand twist grip is coupled to the worm wheel via a ball lock adapted to be unlocked via one of an operating element and a push button. 13. The system of claim 11, wherein the hand twist grip is movable in a direction of a axis of rotation of the drive element between a lowered position, in which the hand twist grip is secured against rotation, and another position in which the hand twist grip is capable of rotating. 14. The system of claim 13, wherein the tightening mechanism further comprises a spring arranged to move the hand twist grip, whereby spring can move, during unlocking, the ball lock from the lowered position to the other position.