Fastener having a damping function

Patent metadata

Field	Value
Publication number	US-11248645-B2
Application number	US-201716313315-A
Country	US
Kind code	B2
Filing date	Jun 12, 2017
Priority date	Jun 30, 2016
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A fastener having a damping function with which at least a first and a second component can be connected via a screw connection. The fastener consists of the following components: an elastically deformable outer sleeve, a support sleeve arranged therein and a screw sleeve with telescopic portion arranged in the outer sleeve. When establishing the connection between the components, the outer sleeve folds, whereby the support sleeve and the screw sleeve are moved into each other.

First claim

The invention claimed is:

1. A fastener having a damping function, with which at least a first and a second component can be connected via a screw connection, comprising the following features:
a. an elastically deformable outer sleeve having a screw-in opening in a first axial end portion and a fastening section for a screw in a second axial end portion, wherein the outer sleeve comprises, at least in the first axial end portion, a rotationally asymmetrical circumferential contour with which a positive locking against rotation can be established in a component opening adapted to the circumferential contour of the outer sleeve, and
b. a rotationally asymmetrical support sleeve,
b1. which is positive-lockingly arranged against rotation relative to the outer sleeve within the outer sleeve in the first axial end portion, so that the circumferential contour of the elastically deformable outer sleeve is supported in the first axial end portion at least in certain areas in a form-maintaining manner, and
b2. which is positive-lockingly connected to the fastening section arranged firmly in the second axial end portion against a relative rotation between the first and the second axial end portion of the outer sleeve.

2. The fastener according to claim 1 , the fastening section of which is arranged rotation-free at least with a subportion radially within the support sleeve and can be displaced in the axial direction of the support sleeve relative to the support sleeve.

3. The fastener according to claim 1 , the outer sleeve of which comprises in the first axial end portion a radial collar and in the second axial end portion opposite the first a fixedly arranged screw sleeve, which comprises the fastening section in which a thread of the screw can be received.

4. The fastener according to claim 3 , the screw sleeve of which comprises a screw channel extending coaxially to the outer sleeve, which is formed cylindrically or conically tapered in a screw-in direction.

5. The fastener according to claim 3 , the screw sleeve of which comprises a radial outer contour at least two-stepped in the axial direction including a fastening portion facing away from the support sleeve and a telescopic portion facing the support sleeve, wherein the telescopic portion has a smaller radial extension than the fastening portion and an inner axial channel of the support sleeve.

6. The fastener according to claim 5 , in which the fastening portion and the telescopic portion of the screw sleeve are connected with each other.

7. The fastener according to claim 5 , in which an outer contour of the telescopic portion of the screw sleeve is adapted in shape to an inner contour of a radial inner wall of the support sleeve, so that the support sleeve blocks the screw sleeve against rotation and the outer sleeve can be compressed in axial direction torsion-free about a longitudinal axis.

8. The fastener according to claim 1 , the outer sleeve of which comprises a non-circular or elliptical or hexagonal or octagonal circumferential contour in at least the first end portion.

9. The fastener according to claim 8 , in which an inner wall contour of the outer sleeve is formed analogously to the circumferential contour.

10. The fastener according to claim 9 , in which the support sleeve is formed at its radial outer wall to match the inner wall contour of the outer sleeve.

11. The fastener according to claim 1 , in which the support sleeve provides an axial abutment face in the direction of the second axial end portion at the fastening portion, which limits an axial shortening of the outer sleeve and an accompanying folding transverse to a longitudinal axis of the outer sleeve by the screw connection.

12. Connection of at least a first and a second component with the fastener according to claim 1 in which a screw connection holds the components and the fastener together.

13. The connection according to claim 12 , in which the at least one component comprises a rotationally asymmetrical opening adapted to the rotationally asymmetrical circumferential contour of the outer sleeve, in which the outer sleeve is arranged positive-lockingly against rotation.

14. The connection according to claim 12 , in which the at least one first component is held between a radial collar and a folding of the elastically deformable outer sleeve and the at least one second component is held between the radial collar and a head of a screw screwed into the fastener.

15. Connection method of at least one first component having a rotationally asymmetric opening and at least one second component with a fastener according to claim 1 which comprises the following steps:
i. inserting the fastener into the opening of the at least one first component so that the fastener is held in a positive-locking manner against rotation in the opening,
ii. arranging the at least one second component with a fastening opening adjacent to the fastener and
iii. screwing-in of a screw into the fastener and through the fastening opening and the opening of the components until the first component is fastened between a radial collar and a folding of the outer sleeve and the second component is fastened between a head of the screw and the radial collar of the outer sleeve.

16. The connection method according to claim 15 , wherein, during screwing-in of the screw into a fastening section in the second axial end portion of the outer sleeve, the fastening section is positive-lockingly held against rotation in the support sleeve and is displaced in the axial direction of the support sleeve within the support sleeve.

17. The connection method according to claim 15 , wherein, during screwing-in, the outer sleeve is shortened until the support sleeve supports itself against an axial abutment face of the screw sleeve.

18. The connection method according to claim 15 , in which a thread-cutting or thread-tapping screw is screwed into a fastening section of the outer sleeve.

19. Manufacturing method for a fastener according to claim 1 , comprising the following steps:
i. manufacturing an outer sleeve from an elastically deformable material having a rotationally asymmetric circumferential contour by means of an injection molding method or an additive manufacturing method,
ii. manufacturing a screw sleeve by means of injection molding or an additive manufacturing method and fastening the screw sleeve in the outer sleeve,
iii. manufacturing a rotationally asymmetric support sleeve adapted in shape to the outer sleeve, which consists of a material having a lower deformability than the outer sleeve, by means of an injection molding method or an additive manufacturing method, and
iv. arranging the support sleeve in the outer sleeve.

20. The manufacturing method according to claim 19 , in which at least the outer sleeve and the screw sleeve are manufactured in a two-component injection molding method.

21. The manufacturing method according to claim 19 , in which the support sleeve and the screw sleeve are manufactured as a detachable composite, wherein the composite is realized by frictional engagement between the support sleeve and the screw sleeve or by destroyable connection webs.

Assignees

• Boellhoff Verbindungstechnik Gmbh

Inventors

• Figge Hans-Ulrich
• Zelmer Viktor

Classifications

• F16B29/00 Primary

  Screwed connection with deformation of nut or auxiliary member while fastening ({Nuts fastened to surfaces by riveting F16B37/065}; members deformed for locking screws, bolts or nuts F16B39/22) · CPC title

• F16B37/067

  the material of the nut being deformed by a threaded member generating axial movement of the threaded part of the nut, e.g. blind rivet type · CPC title

• F16B5/0258 Primary

  using resiliently deformable sleeves, grommets or inserts (F16B43/001 takes precedence) · CPC title