Concrete Screw

Patent metadata

Field	Value
Publication number	US-2016003284-A1
Application number	US-201414770405-A
Country	US
Kind code	A1
Filing date	Feb 12, 2014
Priority date	Feb 26, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A concrete screw is disclosed. The concrete screw includes a shank and a thread disposed on the shank with a thread helix and a thread root. A cutting recess is disposed in a tip region of the shank where the cutting recess runs at least in sections within the thread root and without interrupting the thread helix. A rolling die for producing the concrete screw and a method for producing the concrete screw are also disclosed.

First claim

1 .- 15 . (canceled)

16 . A concrete screw, comprising:
a shank; and a thread disposed on the shank with a thread helix and a thread root; wherein a cutting recess is disposed in a tip region of the shank and wherein the cutting recess runs at least in sections within the thread root and without interrupting the thread helix.

17 . The concrete screw according to claim 16 , wherein the cutting recess is interrupted at least one time by the thread helix.

18 . The concrete screw according to claim 16 , wherein the cutting recess runs in at least one section outside of the thread root and wherein the cutting recess is open toward a front face of the shank.

19 . The concrete screw according to claim 16 , wherein the cutting recess runs at least in a section within a first turn of the thread root beginning at a thread start.

20 . The concrete screw according to claim 16 , wherein a depth of the cutting recess is at least 10/100th of a diameter of the shank.

21 . The concrete screw according to claim 16 , wherein the cutting recess, in a cross-sectional view of the shank, is asymmetric wherein a first flank of the cutting recess leading in a screw-in direction of the thread helix runs flatter relative to a lateral surface of the shank than a second flank of the cutting recess trailing in the screw-in direction.

22 . The concrete screw according to claim 16 , further comprising a second cutting recess in the shank.

23 . The concrete screw according to claim 16 , wherein in the tip region of the shank, a plurality of cutting recesses are disposed which run at least in sections inside the thread root without interrupting the thread helix.

24 . The concrete screw according to claim 16 , further comprising a second thread helix which runs at least in a section in the thread root on a side of the thread opposite the tip region.

25 . The concrete screw according to claim 16 , further comprising a screw head that is broadened relative to the shank.

26 . A rolling die for producing a concrete screw, comprising:
a plurality of grooves for rolling a thread; and at least one projection for rolling a cutting recess which does not interrupt the plurality of grooves for rolling the thread.

27 . The rolling die according to claim 26 , further comprising at least one projection set including a plurality of projections for a multi-stage rolling of a cutting recess.

28 . The rolling die according to claim 27 , wherein a height of the plurality of projections increases at least in sections in a work direction of the rolling die.

29 . A method for producing a concrete screw according to claim 16 in which both the thread helix and the cutting recess are formed in a same thread rolling process by a rolling die according to claim 26 .

30 . The method according to claim 29 , wherein the cutting recess is formed by a plurality of projections which are disposed one after another on the rolling die.

Assignees

• Hilti Ag

Inventors

• Neumaier Tobias
• Winkler Mark
• Domani Guenter
• Achleitner Corinna

Classifications

• B21H3/04

  Making by means of profiled-rolls {or die rolls} · CPC title

• F16B25/103 Primary

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

• F16B25/0068 Primary

  with multiple-threads, e.g. a double thread screws · CPC title

• F16B25/0026 Primary

  the material being a hard non-organic material, e.g. stone, concrete or drywall (F16B25/0031 takes precedence) · CPC title

• B21H3/06

  Making by means of profiled members other than rolls, e.g. {reciprocating flat dies or} jaws, moved longitudinally or curvilinearly with respect to each other · CPC title