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AssigneeSte. Ateliers de la Haute Garonne et Auriol & Cie.
InventorsJean-Marc Auriol, Philippe Bornes
Estimating the term…
The invention relates to a blind riveting member of the type comprising a tubular sleeve (1) and a mandrel (2) passing through said sleeve. The stem portion (5) of the tubular sleeve (1) comprises successively along its length, a first articulation zone (5a), an inclined portion (5b), a second articulation zone (5c) and an end portion (5d). These zones or portions are arranged in such a manner that the sleeve is subjected to a double folding during setting of the rivet which causes the inclined portion to expand and fold back upon itself toward the materials being assembled, forming a continuous rest surface at the periphery of the hole which contains the riveting member. The invention is applied in particular for assembling fragile materials such as composite materials. It permits providing a good vibration resistant holding for these materials without risk of damaging the same.
A blind riveting member comprising:
A blind riveting member comprising:
A process for the assembly of materials with at least one riveting member comprising providing a riveting member including a tubular casing (1) having an insertion portion (4) adapted to fit in a hole in the materials to be riveted and a stem portion (5) adapted to extend from one side of said materials, a mandrel (2) having a head (2a) of a diameter greater than the bore of the casing (1) and a shank (2b) adapted to be housed in the bore of the casing, with an extension (2c) extending opposite the stem portion thereof for exerting an axial tension on said mandrel, the stem portion (5) of the casing comprising a first articulation zone (5a) situated in proximity to the junction between the stem portion (5) and the insertion portion (4), the first articulation zone having a reduced thickness with respect to that of the insertion portion for conditioning a folding at its level during axial tensioning of the mandrel (2), an inclined portion (5b) connected to the first articulation zone (5a), said portion having an inclination with respect to the axis (X) of the casing in such a manner as to diverge therefrom with respect to said first articulation zone, a second articulation zone (5c) situated at the base of the inclined portion (5b), said second articulation zone being a zone for changing direction toward the axis of the casing in order to condition a folding at its level during axial tensioning of the mandrel (2), an end portion (5d) connected to the second articulation zone (5c), said end portion having a different direction from that of the inclined portion (5b) and forming with said latter an internal angle .alpha. less than 180.degree., the end portion (5d) and the head (2a) of the mandrel being provided with holding means (6-8) adapted to prevent a radial sliding of the free end of the casing with respect to the head of the mandrel when it is exerting the axial tension on the mandrel, and the thickness e.sub.2 of the casing at the level of the first articulation zone (5a) being such that 0.3.ltoreq.e.sub.2 /e.sub.1 .ltoreq.0.7, where e.sub.1 is the thickness of said casing at the level of the insertion portion (4), piercing the materials with a hole of a diameter corresponding essentially to the external diameter of the insertion portion of the casing, placing said riveting member in this hole such that the stem portion of the casing extends to one side and the extension of the mandrel extends to the other side of the hole, applying the head of the mandrel against the free end of the end portion of the casing for bringing their holding means into cooperation and applying tension to the extension of the mandrel and a peripheral counterpressure to the casing, thereby causing a folding of the first and second articulation zones, for bringing the inclined portion of the casing into contact against the materials at the periphery of the hole.
Dependencies are inferred from the claim text.