US Patent 11706879 Subrack and module assembly comprising the subrack

A subrack including a frame defining a subrack space and adapted to receive a device module to an operative position, the frame comprising four side walls and an end wall. The subrack comprises a coupling system adapted for coupling the subrack to four other subracks in order to form a subrack matrix, the coupling system comprising at least one wall recess on an inner surface of each of the side walls, and at least one primary screw hole in each of the side walls such that the at least one primary screw hole is located in the at least one wall recess.