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EP-4551829-B1 - FASTENING DEVICE

EP4551829B1EP 4551829 B1EP4551829 B1EP 4551829B1EP-4551829-B1

Inventors

  • MOUILLON, Romain
  • ALBARAN, JEAN-FRANCOIS
  • OULES, Anthony

Dates

Publication Date
20260513
Application Date
20230710

Claims (15)

  1. A fastening part (100) for fastening a first part to a second part having a hole, the fastening part (100) includes a body which comprises: - a head (20) having a rear surface intended to be positioned opposite the first part, and - a shank (60) extending from the rear surface of the head (20) and intended to be inserted into the hole; wherein the shank (60) includes fins (62) which project from the shank (60), and wherein at least one fin (62) includes, at its free end, a double-head (63) serving as a thread; characterised in that the fastening part includes at least one flexible tab (40) which comprises an elastic arm (44) one end of which is secured to the body of the fastening part (100), the arm (44) including a control (42); and in that the arm (44) deforms so that the control (42) fits in a predefined position with respect to the head (20), when the fastening part (100) is in a mounting position in which the first part is fastened to the second part by the fastening part (100).
  2. The fastening part (100) according to claim 1, wherein said at least one fin (62) includes a thin area between the shank (60) and the double-head (63).
  3. The fastening part (100) according to one of the preceding claims, wherein the double-head (63) includes an upper head (64) and a lower head (65) separated by an intermediate space (65), these two heads (64, 66) defining a thread pitch.
  4. The fastening part (100) according to one of the preceding claims, wherein the fins (62) are fir tree like shaped.
  5. The fastening part (100) according to any one of the preceding claims, wherein the head (20) includes at least one notch (22), corresponding to the predefined position, intended to receive the control (42) in the mounting position of the fastening part (100).
  6. The fastening part (100) according to any one of the preceding claims, wherein the head (20) includes a front surface opposite to the rear surface, and a surface of the control (42), in the mounting position of the fastening part (100), is coincident with the front surface of the head (20).
  7. The fastening part (100) according to any one of the preceding claims, wherein the head (20) includes at least one setback (26), intended to accommodate the control (42) once the control (42) fits in the predefined position, and to prevent the control (42) from moving during unscrewing.
  8. The fastening part (100) according to any one of the preceding claims, wherein the arm (44) of the flexible tab (40) is secured to the rear surface of the head (20).
  9. The fastening part (100) according to any one of the preceding claims, wherein the flexible tab (40) is positioned on the side of the rear surface of the head (20).
  10. The fastening part (100) according to any one of the preceding claims, wherein the arm (44) of the flexible tab (40) extends toward the edge of the head (20).
  11. The fastening part (100) according to any one of the preceding claims, including at least one pair of flexible tabs (40), wherein the two flexible tabs of the pair of flexible tabs (40) extend in two opposite directions.
  12. The fastening part (100) according to claim 10, including at least one pair of notches (22), each intended to receive one of the controls (42) in the mounting position of the fastening part (100).
  13. The fastening part (100) according to one of the preceding claims, wherein the head (20) has an imprint (24) for receiving a tool.
  14. The fastening part (100) according to any one of the preceding claims, being manufactured essentially of a plastic material.
  15. The fastening part (100) according to any one of the preceding claims, wherein the shank (60) includes additional fins made of metal, so-called claws, project from the surface of the shank (60) and extend towards the head (20).

Description

Technical field of the invention The present invention relates to a fastener, in particular a rivet intended to be inserted and mounted in a hole to fasten a first part to a second part, referred to as a support. For example, the fastener allows for the assembly of hard materials (metal, steel, etc.) to hard materials in the automotive industry (installation of accessories, body parts, etc.). More specifically, the rivet comprises a shank having double-headed wings. Previous technique A rivet is known from the prior art in the form of a rod which is fitted at one end with a head. By head, we mean a part with a cross-section larger than the cross-section of the rod. The head of this type of fastener has a rear surface designed to be positioned opposite a part to be fastened. Preferably, the head also has a front surface opposite the rear surface. The stem extends from the rear surface of the head and is designed to be inserted into a mounting hole located in the parts to be assembled by the fastener. The head can be round or rectangular. The cross-section of the stem can be circular. This fastener can be used, for example, to attach a part to a structure or support. To properly secure this prior art fastener, it is important that the fastener is driven sufficiently into the mounting hole. Depending on the force applied during insertion, the rear surface of the fastener head may not be in contact with the part being fastened. As a result, the fastener is not properly installed, making it difficult for the operator to verify the fastening status. In this case, the fastener may come loose during the use of the parts being assembled. Progress continues to be made in improving fastening systems that meet various needs such as rigidity, fastening strength (efficient ratio between insertion force and removal force), and many others. A clip is known to EP 2 369 187 A1 . Description of the invention The present invention aims to remedy these drawbacks by proposing a fixing piece that allows for better rigidity of the end of the clipping blade, a double hook in the thread and a better possibility of unscrewing. To this end, the present invention relates to a fastening piece for attaching a first part to a second part having a fastening hole, according to claim 1, comprising a body which includes: a head having a rear surface intended to be positioned opposite the first piece, and a rod extending from the rear surface of the head and intended to be inserted into the fixing hole. The rod has gripping fins that protrude from the rod, and at least one gripping fin has, at its free end, a double head serving as a thread. In one embodiment, said at least one attachment fin has a thin area between the stem and the double head. In one embodiment, the double head comprises an upper head and a lower head separated by an intermediate space, these two heads defining a thread pitch. In one embodiment, the fins are in the shape of a Christmas tree. The flexible leg includes an elastic arm, one end of which is fixed to the body of the fastener. The arm includes an indicator. When the fastener is installed in the part(s) to be fastened, the arm of the flexible leg deforms so that the indicator moves to enter a predefined position relative to the head of the fastener. With the movement of the indicator, the operator can visually see that the fastener is correctly mounted. Advantageously, the indicator moves towards the head of the fastener in the mounting position. Normally, the head of the fastener and its surroundings are clearly visible, allowing the operator to more easily verify that the indicator is correctly positioned. Preferably, the stem of the fastener has fins protruding from the stem, which act as threads that prevent the fastener from coming out of the mounting hole, thus making the fastener stronger. Preferably, the head has at least one notch to receive the indicator in the mounting position of the fastener. The notch serves as the predefined position into which the indicator enters. This provides a more clearly visible indication for the operator, especially from a top view. Once the indicator enters the notch, the operator can visually confirm that the fastener is correctly mounted. In one embodiment, the head of the fastener includes at least one counter-form, designed to house the indicator when it enters the predefined position, and to prevent the indicator from moving during unscrewing. This configuration ensures that the head is flush during unscrewing, for tooling purposes. Preferably, the counter-form is located in the predefined position that receives the witness in the mounting position. Advantageously, each predefined position has two counter-forms to house the witness in a more balanced manner. Advantageously, in the mounting position of the fastener, a surface of the indicator coincides with a front surface of the head, so that the two surfaces are flush. That is, there is no step between the surface of