Screw

• US 20070269288A1
• Filed: 07/09/2005
• Published: 11/22/2007
• Est. Priority Date: 07/15/2004
• Status: Abandoned Application

• Current Assignee: SFS Intec Holding AG (SFS Group AG)
• Original Assignee: SFS Intec Holding AG (SFS Group AG)
• Inventors: Palm, Erich
• Application Number:
  US11/568,522
• Publication Number:
  US 20070269288A1
• Time in Patent Office: Days
• US Class Current: 411/386
• CPC Class Codes: F16B 25/0021 the material being metal, e.g. sheet-metal or aluminium F16B25/0031 takes precedence
• CPC Class Codes: F16B 25/0078 with a shaft of non-circular cross-section or other special geometric features of the shaft
• CPC Class Codes: F16B 35/048 Specially-shaped necks F16B35/06 takes precedence
• CPC Class Codes: F16B 39/225 by means of a settable material

Abstract

A screw is provided having an at least partially threaded (4) shank (7) and a screw head (3). An unthreaded section (2) is provided between the screw head (3) and the thread (4). The thread (4), at least in the distal area of the shank (7) facing the screw head (3) is provided with a groove (5), notch, slot, or the like crossing the thread (4).

Claims

1. A screw with a shank at least partially provided with a thread for screwing into a pre-formed hole and with a screw head, wherein a thread-free section is provided between the screw head and the thread, at least at an end region of the shank (7) facing the screw head (3), the thread (4) is provided with at least one groove (5) crossing the thread (4), that tapers off at the thread-free section (2), the thread (4) is formed trilobularly at an end section (6) facing away from the screw head, and a diameter (DG) of the thread-free section is at the most slightly larger than a root diameter (DK) of the thread on the shank.

2. A screw according to claim 1, wherein the thread-free section (2) has a smaller diameter (DG) than a root diameter (DK) of the shank (7).

3. A screw according to claim 1, wherein, a width (B) of the thread-free section (2) is equivalent to a thickness (D1) of a metal sheet (11) closest to a bottom of the head (13).

4. A screw according to claim 1, wherein, a width (B) of the thread-free section (2) is approximately equivalent to a thickness (D2) of all metal sheets (11, 14) to be fastened.

5. A screw according to claim 1, wherein the groove (5), notch, slot, or the like has U-shaped, V-shaped, or trapezoidal recesses (9) in the thread (4).

6. A screw according to claim 1, wherein two or more grooves (5) are provided.

7. A screw according to claim 1, wherein the groove (5) extends parallel to an axis of the shank (7).

8. A screw according to claim 1, wherein the groove (5) extends helically in a clockwise and/or counter-clockwise direction in reference to the shank (7).

9. A screw according to claim 1 wherein the groove (5) is formed to a depth of the root diameter (DK).

10. A screw according to claim 1, wherein the groove (5) is deeper than the root diameter (DK).

11. A screw according to claim 1, wherein a binding and/or adhesive coating (18) is applied to a thread portion (19) adjacent to the thread-free section (2).

12. A screw according to claim 1, wherein a binding and/or adhesive coating (18) is applied to the thread-free section (2) and/or a bottom (13) of the screw head.

13. A screw according to claim 11, wherein a two-component adhesive is applied as the coating (18).

14. A screw according to claim 11, wherein plastic is applied as the coating (18).

15. A screw according to claim 1, wherein wax, polytetrafluoroethylene (PTFE), or plastic is applied as a lubricating coating (18) at least to an end region (6) of the shank facing away from the screw head.

16. A screw according to claim 11, wherein the coating (18) is applied partially or over an entire circumference.

17. A screw according to claim 1, wherein the thread (4) is formed trilobularly at the end section (6) facing away from the screw head.

18. A screw according to claim 1, wherein the shank (7) is provided with a conically tapering thread (4) at the end section (6) facing away from the screw head.

19. A screw according to claim 1, wherein the thread (4) tapers to a tip at the end section (6) facing away from the screw head.

20. A screw according to claim 1, wherein the end section (6) facing away from the screw head (3) is provided with a self-drilling or self inserting tip (15).