Fastening device for expanded-metal sheets

Claim 1

IN COMBINATION, WITH AN EXPANDED METAL SHEET FORMED OF INTEGRALLY CONNECTED STRANDS AND HAVING AN EXPOSED SURFACE AND A PLURALITY OF ELONGATED DIAMONDSHAPED OPENINGS BETWEEN STRANDS, SAID STRANDS SLOPING FROM PLANE OF SAID EXPOSED SURFACE AT EACH SIDE OF SAID OPENINGS; AND A STRUCTURAL MEMBER SUPPORTING SAID SHEET AND ENGAGING THE SURFACE THEREOF OPPOSITE SAID EXPOSED SURFACE; OF A DEVICE FOR FASTENING SAID SHEET TO SAID MEMBER AND COMPRISING: A WASHER HAVING AN ELONGATED FLAT PORTION TAPERING AT ITS ENDS AND FITTING AT LEAST PARTIALLY AROUND THE EDGES OF ONE OF SAID OPENINGS AND RESTING ON THE STRANDS AT OPPOSITE SIDES OF THE OPENING AND LYING ENTIRELY INSIDE THE PLANE OF SAID EXPOSED SURFACE; A CLIP HAVING A FLAT PORTION ENGAGING SAID MEMBER OPPOSITE SAID SHEET AND A FLANGE ABUTTING THE SURFACE OF SAID SHEET OPPOSITE SAID EXPOSED SURFACE; A BOLT CARRIED BY SAID WASHER AND EXTENDING AT AN OBLIQUE ANGLE WITH RESPECT TO THE FLAT PORTION THEREOF BUT NORMAL TO THE PLANES OF THE SURFACES OF SAID SHEET AND THROUGH SAID SHEET AND THE FLAT PORTION OF SAID CLIP AND NORMAL THERETO; AND A LOCK NUT THREADEDLY ENGAGED WITH SAID BOLT.