A hinge assembly , comprising: - at least one first row of hinge plates , - at least one second row of hinge plates , - a plurality of support rods , - a plurality of pivot rods , - the support rods passing through the hinge plates of the second row of hinge plates being offset in relation to the support rods passing through the hinge plates of the first row of hinge plates such that a hinge plate of the second row only partially overlaps a hinge plate of the first row , - each hinge plate of the second row being pivotally connected to at least one neighboring hinge plate of at least one first row by means of one of said pivot rods , forming in this way an interconnected hinge plate set , - wherein each support rod passes through a hinge plate of an interconnected hinge plate set and borders the neighboring hinge plate of the interconnected hinge plate set , so that the neighboring hinge plate can fold around the support rod passing through the hinge plate of the interconnected hinge plate set ; characterised in that - each hinge plate of one row comprises at least one edge notch arranged to accommodate the support rod passing through a hinge plate of a neighboring row , such that the support rod and the hinge plate interlock when the hinge plate is unfolded around the support rod ; and - each hinge plate comprises two sheets of metal and a locking spring , the locking spring being interspersed between said two metal sheets and carried by the support rod and pivot rod connected to the hinge plate , wherein the opposing ends of the locking spring are hook-shaped such that they partially surround and connect with the pivot rods , while the middle section of the locking spring is configured to be pulled in a direction away from the pivot rods, and hence the ends of the locking spring , by the support rod , the edge notch being arranged in the locking spring . - at least one first row of hinge plates , - at least one second row of hinge plates , - a plurality of support rods , - a plurality of pivot rods , - the support rods passing through the hinge plates of the second row of hinge plates being offset in relation to the support rods passing through the hinge plates of the first row of hinge plates such that a hinge plate of the second row only partially overlaps a hinge plate of the first row , - each hinge plate of the second row being pivotally connected to at least one neighboring hinge plate of at least one first row by means of one of said pivot rods , forming in this way an interconnected hinge plate set , - wherein each support rod passes through a hinge plate of an interconnected hinge plate set and borders the neighboring hinge plate of the interconnected hinge plate set , so that the neighboring hinge plate can fold around the support rod passing through the hinge plate of the interconnected hinge plate set ; characterised in that - each hinge plate of one row comprises at least one edge notch arranged to accommodate the support rod passing through a hinge plate of a neighboring row , such that the support rod and the hinge plate interlock when the hinge plate is unfolded around the support rod ; and - each hinge plate comprises two sheets of metal and a locking spring , the locking spring being interspersed between said two metal sheets and carried by the support rod and pivot rod connected to the hinge plate , wherein the opposing ends of the locking spring are hook-shaped such that they partially surround and connect with the pivot rods , while the middle section of the locking spring is configured to be pulled in a direction away from the pivot rods, and hence the ends of the locking spring , by the support rod , the edge notch being arranged in the locking spring . <EOS>