Fastener, fastening arrangement and method for mounting

Patent metadata

Field	Value
Publication number	US-11549542-B2
Application number	US-201816643178-A
Country	US
Kind code	B2
Filing date	Aug 28, 2018
Priority date	Sep 1, 2017
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A fastening arrangement including a grommet, which is configured as a substantially cylindrical sleeve with a head part, with a hollow-cylindrical shaft and with a conical tip, and also a fastener and a nut, for example made of plastic, which is fitted on the first threaded portion of the fastener. The fastener has two threaded portions, wherein one threaded portion is configured as a right-hand thread and the other threaded portion is configured as a left-hand thread (or vice versa). Moreover, the invention comprises a mounting method for such a fastening arrangement, in which the setting operation (anchoring of the fastener, adjustment of the sheath) can be managed in one step without changing the driving direction of the setting tool.

First claim

The invention claimed is:

1. A fastener, comprising:
a head,
a shaft adjoining said head, and
a tip adjoining said shaft,
a first thread section on the shaft close to the tip,
a second thread section on the shaft close to the head,
a nut fitted on the second thread section,
a stop arranged between the first thread section and the second thread section, and
the first thread section close to the tip is formed as a right-hand thread and the second thread section close to the head is formed as a left-hand thread, or the first thread section close to the tip is formed as a left-hand thread and the second thread section close to the head is formed as a right-hand thread,
wherein the nut has a cylindrical shape about a central axis of rotation and, at one longitudinal end, has a force engagement projection or recess.

2. The fastener as claimed in claim 1 , wherein the nut is molded from plastic or is a sheet-metal molded part or deep-drawn part.

3. The fastener as claimed in claim 1 , wherein the stop comprises part of a ring-shaped bead, a section with enlarged core diameter of a thread-free section, or runout facing the tip of the second thread section close to the head.

4. The fastener as claimed in claim 1 , further comprising a thread-free shaft region arranged between the first thread section and the stop.

5. The fastener as claimed in claim 1 , wherein the tip comprises a drill tip.

6. The fastener as claimed in claim 1 , wherein a pitch of the thread in the first thread section differs from a pitch in the second thread section.

7. The fastener as claimed in claim 1 , wherein outer diameters of the first thread section close to the tip and of the stop are less than a free inner thread diameter of the nut.

8. The fastener as claimed in claim 1 , wherein the second thread section has a weakened form at least in a region where the nut is arranged.

9. The fastener as claimed in claim 8 , wherein the nut or the region is arranged on a thread runout close to the head of the second thread section.

10. The fastener as claimed in claim 8 , the region is formed as a thread-free section.

11. A fastening arrangement comprising
a grommet formed as a substantially cylindrical sleeve having a head part, a hollow-cylindrical shaft and a conical tip, and
a fastener as claimed in claim 1 .

12. The fastening arrangement as claimed in claim 11 , the conical tip of the grommet has a passage opening having a diameter that is less than an inner diameter of a cylindrical inner space of the shaft, and the cylindrical inner space and the passage opening have a common central axis.

13. The fastening arrangement as claimed in claim 12 , wherein a transition region between the cylindrical passage opening and the cylindrical inner space forms a substantially radially symmetrical, planar or slightly conical stop surface.

14. The fastening arrangement as claimed in claim 13 , wherein the head of the grommet either has a flange-shaped form, configured to form a holding surface for a load distribution disk, or an integral radial head widening.

15. A method for mounting a fastening arrangement, comprising the following steps:
providing a fastening arrangement as claimed in claim 13 in which the fastener is introduced with the nut into the inner space of the grommet,
pushing or screwing the fastening arrangement into a building envelope comprised at least of a cover film, an insulation layer and a support sheet,
drilling-through the support sheet with the aid of the tip which is configured as a drill tip until the support sheet abuts against the stop and the fastener overwinds,
securing the nut against rotational movement of the fastener by a tool by moving the nut on the second thread section of the fastener in a direction of the tip,
abutting the nut against the stop surface of the grommet and driving the grommet by the nut during a further rotational movement of the fastener, and
ending the rotational movement upon attainment of a placement depth of the grommet.

16. The method as claimed in claim 15 , wherein driving direction of the fastener is maintained during the entire placement operation of the fastening arrangement.

17. The fastening arrangement as claimed in claim 11 , wherein the nut is molded from plastic, and is injected directly onto a section of the second thread section close to the head.

18. The fastening arrangement as claimed in claim 11 , wherein the nut is pushed onto or screwed onto a section of the second thread section close to the head.

Assignees

• Sfs Intec Holding Ag

Inventors

• Gasser Daniel
• Heinzmann Thomas

Classifications

• F16B25/0021

  the material being metal, e.g. sheet-metal or aluminium (F16B25/0031 takes precedence) · CPC title

• F16B25/0063 Primary

  with a non-threaded portion on the shaft of the screw · CPC title

• F16B25/103

  by means of a drilling screw-point, i.e. with a cutting and material removing action · CPC title

• E04D3/3603

  the fastening means being screws or nails · CPC title

• F16B25/00

  Screws that cut thread in the body into which they are screwed, e.g. wood screws {(F16B35/065 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275, using screws with adjustment sleeves F16B5/0283)} · CPC title