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1. WO2020109760 - A FASTENER

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[ EN ]

Claims

1. A fastener comprising:

a drive end region, a tip end region, and

at least one screw thread extending from at least proximal the tip end region; and

a dowel portion located between the at least one screw thread and the drive end region, said dowel portion comprising a thread form having at least one substantially flat and axially oriented outer surface extending around the dowel portion and at least one channel extending towards the drive end region.

2. The fastener according to claim 1 , wherein the thread form is arranged in the same direction as the at least one screw thread.

3. The fastener according to claim 1 or 2, wherein the at least one outer surface and the at least one channel have substantially the same width in an axial direction.

4. The fastener according to claim 3, wherein the width substantially equals half the pitch of the thread form.

5. The fastener according to any preceding claim, wherein the thread form

comprises a trapezoidal thread form.

6. The fastener according to any preceding claim, comprising a reaming portion located between the dowel portion and the at least one screw thread.

7. The fastener according to claim 6, wherein the reaming portion comprises a plurality of circumferentially spaced apart cutting elements defining a channel between adjacent ones of the cutting elements.

8. The fastener according to claim 7, wherein each channel of the reaming portion is substantially the same width as the at least one channel of the dowel portion.

9. The fastener according to claim 7 or 8, wherein at least one channel of the reaming portion communicates with the at least one channel of the dowel portion.

10. The fastener according to any of claims 7 to 9, wherein the cutting elements define an outer diameter which is substantially the same as an outer diameter defined by the thread form of the dowel portion.

1 1. The fastener according to any of claims 7 to 10, wherein the cutting elements are oriented in the same direction as the thread form of the dowel portion.

12. The fastener according to any of claims 6 to 1 1 , wherein a length of the

reaming portion is equal to or greater than a pitch of the at least one screw thread.

13. The fastener according to any of claims 6 to 12, wherein a length of the

reaming portion is equal to or less than a length of the dowel portion in an axial direction.

14. The fastener according to any of claims 6 to 13, wherein the reaming portion is located adjacent to the dowel portion.

15. The fastener according to any of claims 6 to 14, comprising a non-threaded shank portion between the at least one screw thread and the reaming portion.

16. The fastener according to any preceding claim, wherein the drive end region comprises a head portion having at least one tapered countersink surface.

17. The fastener according to claim 16, wherein the countersink surface comprises a plurality of circumferentially spaced apart ribs extending along the countersink surface.

18. The fastener according to claim 17, wherein each rib is angled with respect to a respective axial plane passing through the longitudinal axis of the fastener.

19. The fastener according to claim 18, wherein each rib is angled forwardly with respect to an insertion rotational direction of the fastener.

20. A method of manufacturing a fastener, comprising:

providing a fastener with a drive end region, a tip end region, and at least one screw thread extending from at least proximal the tip end region; and

providing a dowel portion between the at least one screw thread and the drive end region, said dowel portion comprising a thread form having at least one substantially flat and axially oriented outer surface extending around the dowel portion and at least one channel extending towards the drive end region.