Fastening method

Patent metadata

Field	Value
Publication number	US-10746211-B2
Application number	US-201515128124-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	Apr 3, 2014
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A method for fastening a component to a base element, in which method there is produced in the base element a blind bore which defines a depth direction and which has a force transmission surface which has a depth T in the depth direction, wherein the force transmission surface is of frustoconical form with a cone opening half-angle (β) and a mean diameter (d), wherein the blind bore has a conical blind bore base with a cone opening angle (α) and, at the edge thereof, a bevel which extends in the depth direction to a bevel depth L, wherein, in the method, a fastening element is anchored in the blind bore by way of the force transmission surface, and wherein the component is held by the fastening element.

First claim

The invention claimed is:

1. A method for fastening a component to a base element, the method comprising producing a blind bore which defines a depth direction and which has a force transmission surface of surface area A which has a depth T with T<10 mm in the depth direction in the base element, wherein the force transmission surface is of frustoconical form with a cone opening half-angle β of 0° to 20° and a mean diameter d, wherein the mean diameter d is greater than the depth T; wherein the blind bore has a conical blind bore base with a cone opening angle α of at least 60° and less than 180°, and, having at an edge of the blind bore, a bevel which extends in the depth direction to a bevel depth L of 0 mm to 2 mm, wherein the mean diameter d of the force transmission surface A is at least

d
=

(

1
-

k

)

⁢

(

T
-
L

)

⁢
tan
⁢

α
2

and at most

d
=

(

1
+

k

)

⁢

(

T
-
L

)

⁢
tan
⁢

α
2

with a maximum surface tolerance k, wherein k=0.3; and, anchoring a fastening element with respect to the force transmission surface, such that the component is held by the fastening element, wherein the fastening element has a shank with a counter-force transmission surface, the counter-force transmission surface having a frustroconical form with a cone opening half-angle β of 0° to 20° that corresponds to, and has the same value as, the force transmission surface cone opening half-angle β of 0° to 20°, and wherein anchoring the fastening element in the blind bore includes interacting the counter-force transmission surface with the force transmission surface.

2. The method according to claim 1 , wherein the blind bore consists of the blind bore base, the force transmission surface and the bevel.

3. The method according to claim 1 , comprising anchoring the fastening element only by the force transmission surface in the blind bore.

4. The method according to claim 1 , wherein the force transmission surface has an internal thread.

5. The method according to claim 1 , comprising anchoring the fastening element by pressing, gluing, welding, soldering, and/or screwing into the blind bore.

6. The method according to claim 1 , wherein the fastening element is made of metal, an alloy or a plastic.

7. The method according to claim 1 , comprising drilling the blind bore into the base element.

8. The method according to claim 1 , including predetermining the depth T with a stop bit.

9. The method according to claim 1 , including predetermining the depth T with a depth stop.

10. The method of claim 1 , wherein the cone opening angle α is 88° to 138°.

11. The method according to claim 1 , comprising producing a bevel angle between the bevel and the depth direction of between 30° and 60°.

12. The method of claim 11 , comprising producing the bevel angle of between 40° and 50°.

13. The method according to claim 1 , comprising producing a driving angle between a surface of the base element angle and the depth direction of at least 80°.

14. The method of claim 13 , comprising producing the driving angle of at least 85°.

15. The method of claim 1 , wherein the depth T is <8 mm, the cone opening angle α is 88° to 138°, the bevel depth is 0 to 0.5 mm, and k=0.2.

16. The method of claim 15 , wherein the depth T is <6 mm, the cone opening angle α is 98° to 138°, and k=0.1.

17. The method according to claim 1 , wherein the fastening element has an external thread.

18. The method of claim 17 , wherein the external thread is self tapping.

19. The method of claim 18 , wherein the force transmission surface has an internal thread that is complementary to the external thread.

Assignees

• Hilti Ag

Inventors

• Foser Thomas

Classifications

• F16B5/02 Primary

  by means of fastening members using screw-thread ({F16B5/0004 takes precedence}; construction of screw-threaded connections F16B25/00 - F16B39/00) · CPC title

• F16B37/005

  into which threads are cut during screwing · CPC title

• B23B51/0081

  Conical drills · CPC title