Method for mounting a stretched flexible covering on a mounting frame and mounting frame for implementing said method

A method for mounting a flexible lining sheet (1) stretched over a fastening frame (100, 200, 300, 400), the lining sheet having dimensions greater than those of the frame, the fastening frame comprising at least one assembly of base profiles (10, 20, 30, 40), each base profile having a receiving cavity (14, 24, 44) for an edge of the lining sheet (1) and clamping means arranged to retain the edge of the lining sheet in the receiving cavity, wherein the edge of the lining sheet is introduced into the receiving cavity by means of an insertion tool (5) and is kept under tension by the clamping means, the method comprising:

• using a plurality of locking clips (50, 500), having a V-shaped or U-shaped section which are separate pieces of the base profiles (10, 20, 30, 40) and of the lining sheet (1) and which have a shorter length than the base profiles, as clamping means,
• arranging each locking clip to enter and remain in a locked position in the receiving cavity (14, 24, 44), and
• to introduce an edge of the lining sheet (1) into the receiving cavity of a base profile, reserving an excess of lining sheet (la), beyond the edge to be introduced,
• interposing a locking clip (50, 500) between the insertion tool (5) and the edge of the lining sheet (1) to be introduced,
• simultaneously pushing the locking clip (50, 500) and the edge of the lining sheet (1) to be introduced into the receiving housing (14, 24, 44) are until the locked position of the locking clip (50, 500) is achieved, wherein the edge of the lining sheet (1) is clamped between the locking clip (50, 500) and the cavity,
• removing the insertion tool (5), and
• Repeating the above steps along the edges of the lining sheet (1) to be introduced and on the periphery of the fastening frame (100, 200, 300, 400) using, for each new operation, a new locking clip (50, 500) positioned at a distance from the previous one, and entering the excess of lining sheet (la) directly into the receiving cavity (14, 24, 44) or in the section V-shaped or U-shaped of the locking clips (50, 500).