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EP-4438911-B1 - THREADED STUD ATTACHMENT SYSTEM

EP4438911B1EP 4438911 B1EP4438911 B1EP 4438911B1EP-4438911-B1

Inventors

  • OLIVIER, WILLIAM

Dates

Publication Date
20260513
Application Date
20240328

Claims (15)

  1. A fastening system (1) with a threaded stud (34) projecting from a base, for example a motor vehicle chassis, comprising: a) a fastening part (2) comprising: i) a base (3) provided with a through-opening (4) intended to receive the threaded stud (34), ii) two opposing claws (5) each comprising a free end (6) for cooperating with the thread (35) of the stud (34), said free ends (6) of the two claws (5) are facing each other on either side of the opening (4), and iii) two interlocking tabs (7) projecting from two first opposing edges (8) of the base (3) and mechanically connected to the respective two cooperating claws (5), said interlocking tabs (7) are elastically deformable between a free position for interlocking the free ends (6) of the claws (5) into the thread (35) of the stud (34) and a constrained position for spacing said free ends (6) of the claws (5) away from the thread (35) of the stud (34). iv) two tension tabs (9) projecting from two second opposing edges (10) of the base distinct from the first edges (8), said tension tabs (9) are elastically deformable between a free position wherein the base (3) is non-planar and a constrained position wherein the base (3) is planar b) a cocking part (11) of the fastening part (2) comprising: i) an opening (14) intended to receive the threaded stud (34), and ii) means for locking in the constrained position (22) the tension tabs (9) of the fastening part (2); said fastening system (1) is actuatable between a position for fitting around the stud (34) wherein the cocking part (11) holds the tabs (9) of the fastening part (2) in their constrained position, and a position for fastening under tension to the stud (34).
  2. The system according to the preceding claim, characterized in that : the cocking part (11) comprises means for locking in the constrained position (23) the interlocking tabs (7) of the fastening part (2), said fastening system (1) is actuatable between the position for fitting around the stud (34) wherein the cocking part (11) holds the four tabs (7, 9) of the fastening part (2) in their constrained position, and the position for fastening under tension to the stud (34).
  3. The system according to the preceding claim, characterized in that the cocking part (11) comprises connecting means (12, 13) to the fastening part (2) when the interlocking tabs (7) and the tension tabs (9) of the fastening part (2) are in the free position, the fastening system (1) being in its position for fastening under tension to the stud (34).
  4. The system (1) according to claim 2 or 3, characterized in that each interlocking tab (7) of the fastening part (2) comprises a window (15) for cooperating with the cocking part (11) by its connecting means (12).
  5. The system (1) according to the preceding claim, characterized in that the window (15) is delimited by an upper portion (16) for cooperating with the cocking part (11) by its means for locking in the constrained position (23) of the interlocking tab under consideration (7).
  6. The system (1) according to claim 4 or 5, characterized in that the window (15) is delimited by an opposite lower portion (17) from which the claw (5) under consideration projects.
  7. The system (1) according to any one of claims 1 to 6, characterized in that the free end (6) of each claw (5) is concave.
  8. The system (1) according to any one of the preceding claims, characterized in that each claw (5) comprises a planar main body (19) and in that the free end (6) of each claw (5) is inclined relative to a plane of extension of the body (19) of the claw (5), the directions of inclination of the free ends (6) of the two respective claws (5) being opposite.
  9. The system (1) according to any one of the preceding claims, characterized in that each tension tab (9) of the fastening part (2) comprises a main body (20) for deforming the base (3) and a free-end portion (21) for cooperating with the fastening part (11): a) by the locking means (22) provided on the cocking part (11) when the tension tab (9) is in the constrained position and, b) by the connecting means (13) provided on the cocking part (11) when the tension tab (9) is in its free position.
  10. The system (1) according to any one of the preceding claims, characterized in that the base (3) is curved when the tension tabs (9) are in their free position.
  11. The system (1) according to any one of claims 3 to 10, characterized in that : a) The connecting means (12) and the locking means (23) of the interlocking tabs (7) are formed by two opposing projecting stops (24) each comprising: i) a retaining surface (12) of the interlocking tab (7) under consideration in its free position forming the connecting means (12), and ii) a locking shoulder (23) arranged on an inclined receiving surface of the upper portion (16) of the interlocking tab (7) under consideration in its constrained position b) The connecting means (13) and the locking means (22) of the tension tabs (9) are formed by two opposing hollowed members (25) each comprising; i) a locking housing (22) for the free-end portion of the tension tab (9) under consideration in its constrained position, and ii) a grooved portion forming the connecting means (13) and comprising a housing groove (26) for the main body (20) of the tension tab (9) and two retaining edges (27) of the free-end portion (21) of the tension tab (9) arranged on either side of the groove (26) when said tension tab (9) is in its free position.
  12. The system (1) according to the preceding claim, characterized in that the locking housing (22) arranged in each hollowed member (25) of the cocking part (11) is delimited by an inclined receiving surface (28) for the free-end portion (21) of the tension tab (9).
  13. The system (1) according to any one of the preceding claims, characterized in that it comprises a connecting element (29) to a panel (41) intended to be fastened to the base, said element (29) comprises a main body (30), fastening legs (33) to the panel (41) and a housing (31) for the fastening (2) and cocking (11) parts connected to each other.
  14. The system (1) according to the preceding claim, characterized in that the fastening part (2) comprises connecting legs (32) to the connecting element (29), at least an end part of each connecting leg (32) being vis-a-vis a lower face of the main body (30).
  15. A method for installing a panel against a base with at least one fastening system (1) according to any one of claims 2 to 14 to a threaded stud (34) projecting from said base, said method comprising the successive steps of: a) Placing the panel against the base, the stud (34) passing through the panel by an opening formed in said panel b) Placing the fastening system (1) around the stud (34), the tabs (7, 9) of the fastening part (2) being in the constrained position and the base (3) being planar; c) Translation of the fastening system (1) into its constrained position along the threaded stud (34) until the base (3) comes into contact with the panel d) Displacement in translation of the cocking part (11) in the direction of the panel relative to the fastening part (2) in contact support against the panel, the tabs (7, 9) being in their constrained position e) Concomitant release of the tabs (7, 9) and actuation of the fastening part (2) toward its free fastening position around the stud (34), during which the free ends (6) of the claws (5) engage in the thread (35) of the stud (34) and during which the base (3) passes from its planar position to its non-planar position while exerting a force against the panel directed perpendicularly to said base (3) to eliminate any mechanical play between the fastening part (2), the panel and the base.

Description

TECHNICAL FIELD The invention falls within the field of fasteners, and relates more particularly to a threaded stud fastening system, particularly suitable for mounting a panel on an automobile body. PRIOR ART AND DISADVANTAGES OF PRIOR ART As is known, panel fixing on automotive-type chassis is achieved by positioning the panel against the chassis, which includes protruding threaded studs that pass through holes made in the panel, and then screwing bolts into them to fix the panel against the chassis without any mechanical play remaining. These screw-in fixings are often tedious for an operator, in addition to being very time-consuming. One-piece clips are known to snap onto a threaded stud. This eliminates the need for a rotating bolt. However, these clips are designed for a specific type of threaded stud, and the operator must apply significant force to secure and lock the clip around the stud. He is also known from the publication FR3091909 a fixing piece for a threaded stud protruding from a base comprising a fixing piece equipped with several curved claws whose ends are intended to fit into the thread of a stud, and a cover piece intended to cover the fixing piece by exerting a force on the claws: this force deforms the claws which will consolidate the embedding of the ends of the claws in the thread and generate a tensile force against the base. However, the tensile force generated by the fastener against the base after fixing depends greatly on the installation effort provided by the operator. OBJECTIVE OF THE INVENTION The invention therefore aims to provide a fixing system for a threaded stud protruding from a base, the installation of which is carried out in an ergonomic and reproducible manner. DESCRIPTION OF THE INVENTION For this purpose, the invention relates to a fastening system to a threaded stud protruding from a base, for example a motor vehicle chassis, according to claim 1. The fastening system may also include the following optional features, considered individually or in all possible technical combinations: The arming piece includes means for locking the locking tabs of the fixing piece in the constrained position. The fastening system can be actuated between the positioning around the stud in which the cocking piece holds the four tabs of the piece of fixing in their constrained position, and the fixing position under tension at the stud. The arming piece includes means for connecting to the fixing piece when the recessed tabs and tension tabs of the fixing piece are in the free position, the fixing system being in its fixing position under tension to the stud. Each recessed tab of the fixing piece includes a window for cooperation with the armament piece via its connecting means. The window is delimited by an upper portion of cooperation with the armament piece by its locking means in the constrained position of the considered recessed tongue. The window is delimited by an opposite lower portion from which the claw in question protrudes. The free end of each claw is concave. Each claw comprises a main planar body and in that the free end of each claw is inclined with respect to an extension plane of the claw body, the directions of inclination of the free ends of the two respective claws being opposite. Each tension tab of the fastener comprises a main body for base deformation and a free end portion for cooperation with the fastener: a) by the locking means provided on the cocking piece when the tension tab is in the constrained position and, b) by the means of connection provided on the arming part when the tension tab is in its free position. The base is curved when the tension tabs are in their free position. The means for connecting and locking the mounting tabs are formed by two opposing projecting stops, each comprising: a) a retention surface for the recessed tongue considered in its free position, forming means of connection, and b) a locking shoulder provided on an inclined receiving surface of the upper portion of the fixed tongue considered in its constrained position. The means for connecting and locking the tension tabs are formed by two opposing hollow members, each comprising: a) a locking housing for the free end portion of the tension tab in its constrained position, and b) a grooved portion forming connecting means and comprising a groove for housing the main body of the tension tongue and two retaining edges of the free end portion of the tension tongue arranged on either side of the groove when said tension tongue is in its free position. The locking housing provided in each hollowed-out part of the cocking piece is delimited by an inclined surface for receiving the free end portion of the tension tab. The fixing system includes a linking element to a panel intended to be fixed to the base, which element includes a main body, tabs for fixing to the panel and a housing for the fixing and arming parts connected to each other. The fastening piece includes connec