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Screw and drive element with chamfer

  • US 10,385,902 B2
  • Filed: 11/26/2014
  • Issued: 08/20/2019
  • Est. Priority Date: 12/03/2013
  • Status: Active Grant
First Claim
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1. A screw comprising:

  • a screw shaft;

    a screw head which adjoins the screw shaft, in which a drive is formed for rotary driving the screw by means of a drive element;

    wherein the drive comprises a hollow wing section at an outer side of the screw with a circular hollow core and hollow wings provided along the circumference;

    wherein the drive comprises a hollow recess section at an inner side of the screw comprising a hollow cone section;

    wherein the drive at a transition between the hollow wing section and the hollow recess section comprises a chamfer section whose outer surface is angled with respect to an outer surface of the hollow wing section and with respect to an outer surface of the hollow recess section;

    wherein extensions of the hollow wings extend up into the chamfer section;

    wherein the hollow wings from an end of the hollow wing section at an outer side of the screw up to the beginning of the chamfer section have a constant outer diameter; and

    wherein the hollow core of the hollow wing section tapers conically towards the inner side of the screw such that a ratio between outer and inner diameters of a hexalobular profile of the hollow wings increases, in an axial direction from the screw head to the screw shaft, to a maximum value being larger than 1.42;

    1 and smaller than 1.60;

    1.

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