Eyelet for reinforcing the edge of a hole in a carrier strip and device for attaching an eyelet to a carrier strip

Eyelet for reinforcing the area (21) around the edge of a hole (22) in a carrier web (20),

• with a diskless eyelet part (10, 10=), consisting of a plate (11), which rests on the visible side (23) of the carrier web (20);
• of a tubular neck (12), which passes through the hole (22);
• and of an arc-shaped transition (14) between the plate (11) and the neck (12);
• where the free end part (15) of the neck (12) is provided with projections (16), which extend in the axial and/or the radial direction;
• and
• where, after the riveting operation, a flanging of the neck (12) of the eyelet part (10=) is present on the rear surface (24) of the carrier web (20), wherein
• the completed flanging of the neck (12) extends across more than a closed, ring-shaped profile (50) because practically the entire length (48) of the neck is rolled spirally into an interior (51) of the ring-shaped profile and the projections (16) of the end part (15) of the neck (12) are included in the spiral thus formed;
• wherein,
• in the spiral interior of the ring-shaped profile (50), the projections (16) of the neck (12) press against an opposing support surface (49) formed by the plate (11) or by the transition area (14), the area (21) of the carrier web (20) around the edge of the hole ending up between the projections and the support surface, areal compression points (40) thus being produced on the gripped carrier web (20), as a result of which a step-like increase (53) in the thickness of the web material is formed in front of the compression points;
• wherein,
• in the interior (51) of the ring-shaped profile, the end part (41) of the carrier web (20) extends beyond the areal compression points (40) to the edge of the hole and forms a segment of a ring conforming to the shape of the ring-shaped profile (50);
• and wherein,
• when tensile stresses are exerted on the carrier web, the projections (16) engage positively with the step-like increase (53) in the thickness of the web material and oppose the tensile forces, wherein the axial projections (16) on the neck consist of a pronged edge (19) at the end of the neck (12).