Mechanical coupling arrangement for a lattice support beam

A method for manufacturing a mechanical coupling arrangement for a lattice support beam, said mechanical coupling arrangement having a longitudinal direction and a transverse direction, and comprising at least a first chord member, a first diagonal member, and a connector element for joining said first chord member with said first diagonal member, said method comprising:

• extruding and cutting a first aluminium profile forming said first chord member;
• machining at least one groove-shaped recess in said first chord member;
• extruding and cutting a second aluminium profile forming said first diagonal member comprising an abutment surface;
• extruding a third aluminium profile having a cross-sectional shape corresponding substantially to the cross-sectional shape of the connector element in a plane perpendicular to the transverse direction;
• cutting said third aluminium profile in longitudinal sections to produce at least one separate connector element comprising at least a first attachment portion having a first contact surface, and a second attachment portion having a second contact surface, wherein said first contact surface comprising at least one rib-shaped projection running in said transverse direction;
• assembling at least said first chord member, said first diagonal member, and said connector element, such that said first contact surface contacting said first chord member, said second contact surface contacting said abutment surface, and said at least one rib-shaped projection engaging said at least one groove-shaped recess;
• and
• pressing said second contact surface against said abutment surface by means of at least one fastener penetrating through the second attachment portion, wherein the longitudinal direction of the at least one fastener is arranged substantially parallel with a longitudinal direction of said first diagonal member.