Weldless building structures

Patent metadata

Field	Value
Publication number	US-2016252126-A1
Application number	US-201614988314-A
Country	US
Kind code	A1
Filing date	Jan 5, 2016
Priority date	Feb 19, 2010
Publication date	Sep 1, 2016
Grant date	—

Abstract

A building structure including a first building member and a second building member may be connected by a plurality of fasteners, each fastener having a head, a threaded portion having a through hardness of between HRB 70 and HRC 40, a thread-forming portion of at least HRC 50 hardness enabling the fastener to form threads in at least the second steel building member, and a fluted lead portion of at least HRC 50 hardness with a nominal diameter between 70 and 95% of major diameter, such that the fastener is capable of providing a ratio of strip torque to thread-forming torque of at least 3.0 and a ratio of strip torque to drive torque greater than 6.0 when the second steel building member having a thickness of 0.25 inch and the fluted lead portion having at least one diameter within nominal diameter between 80 and 98% of major diameter.

First claim

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21 . A stand-off fastener, comprising:
a head portion having a first head end, and a second head end, a stand-off portion comprising a first stand-off end and a second stand-off end, with the second stand-off end integrally coupled to the first head end of the head portion along a rotational axis, the head portion having a width larger than a width of an anchor portion, the anchor portion having a first anchor end and a second anchor end, the second anchor end integrally coupled to the first stand-off end along a rotational axis of the stand-off fastener, a threaded portion comprising a first threaded end and a second threaded end, with the first threaded end integrally coupled to the second head end of the head portion along a rotational axis of the stand-off fastener, such that the head portion is located between the stand-off portion and the threaded portion and configured to receive a driver to drive the stand-off fastener into a metal structure, a thread-forming portion integrally coupled to the threaded portion along the rotational axis of the stand-off fastener, having lobes adapted to enable formation of threads into the metal structure, and where the stand-off fastener is adapted to be screwed by the head portion into the metal structure and the first stand-off end of the stand-off portion is configured for encapsulation within a cementitious material formed on the metal structure.

22 . The stand-off fastener of claim 21 , where the head portion further comprises a shape with two or more flat sides.

23 . The stand-off fastener of claim 21 , further comprising:
a fluted lead portion integrally coupled to the thread-forming portion along rotational axis of the stand-off fastener, where the fluted lead portion is configured to drill through the metal structure, with the thread-forming portion forming threads in the metal structure as the stand-off fastener is screwed into the metal structure.

24 . The stand-off fastener of claim 23 , where the fluted lead portion integrally coupled to the thread-forming portion is at least HRC 50 hardness with a nominal diameter in a range from 60% to 95% of major diameter of the threaded portion adapted to form a fastener opening, such that the fastener is capable of providing a ratio of strip torque to thread-forming torque of at least 3.0 and a ratio of strip torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch.

25 . The stand-off fastener of claim 24 , where the ratio of strip torque to thread-forming torque is at least 3.0 and a ratio of strip torque to drive torque greater than 8.0 over a range of combined thickness of the metal structure and another steel building member from about 0.036 inch to 0.084 inch.

26 . The stand-off fastener of claim 21 , where the anchor portion is a rolled collar.

27 . The stand-off fastener of claim 21 , where the stand-off portion has a length which is greater than a length of the threaded portion.

28 . The stand-off fastener of claim 21 , where the width of the anchor portion is larger than a width of the stand-off portion.

29 . The stand-off fastener of claim 21 , where the lobes are provided in the thread-forming portion configured with recesses between about the rotational axis, each lobe having a leading portion and a tailing portion, the leading portion and first adjacent recess at a first angle in a range from 50° to 100° from a plane tangent to the lobe adjacent the leading portion, and the tailing portion and second adjacent recess at a second angle in a range from 25° to 50° from a plane tangent to the lobe adjacent the tailing portion, where the first angle is greater than the second angle.

30 . The stand-off fastener of claim 21 , where the thread-forming portion integrally coupled to the threaded portion is at least HRC 50 hardness adapted to form threads into at least the metal structure.

31 . A stand-off fastener, comprising:
a stand-off portion coupled to a head portion and an anchor portion, the head portion having a width larger than a width of the anchor portion, a threaded portion coupled to the head portion along a rotational axis, such that the head portion is located between the stand-off portion and the threaded portion and configured to receive a driver to drive the stand-off fastener into a metal structure, a thread-forming portion coupled to the threaded portion along rotational axis of the stand-off fastener, having lobes adapted to enable formation of threads into the metal structure, and where the stand-off fastener is adapted to be screwed by the head portion into the metal structure and the stand-off portion is configured for encapsulation within a cementitious material formed on the metal structure.

32 . The stand-off fastener of claim 31 , where the head portion further comprises a shape with two or more flat sides.

33 . The stand-off fastener of claim 31 , further comprising:
a fluted lead portion integrally coupled to the thread-forming portion along rotational axis of the stand-off fastener, where the fluted lead portion is configured to drill through the metal structure, with the thread-forming portion forming threads in the metal structure as the stand-off fastener is screwed into the metal structure.

34 . The stand-off fastener of claim 33 , where the fluted lead portion integrally coupled to the thread-forming portion is at least HRC 50 hardness with a nominal diameter in a range from 60% to 95% of major diameter of the threaded portion adapted to form a fastener opening, such that the fastener is capable of providing a ratio of strip torque to thread-forming torque of at least 3.0 and a ratio of strip torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch.

35 . The stand-off fastener of claim 34 , where the ratio of strip torque to thread-forming torque is at least 3.0 and a ratio of strip torque to drive torque greater than 8.0 over a range of combined thickness of the metal structure and another steel building member from about 0.036 inch to 0.084 inch.

36 . The stand-off fastener of claim 31 , where the anchor portion is a rolled collar.

37 . The stand-off fastener of claim 31 , where the stand-off portion has a length which is greater than a length of the threaded portion.

38 . The stand-off fastener of claim 31 , where the width of the anchor portion is larger than a width of the stand-off portion.

39 . The stand-off fastener of claim 31 , where the lobes are provided in the thread-forming portion configured with recesses between about the rotational axis, each lobe having a leading portion and a tailing portion, the leading portion and first adjacent reces

Assignees

• Nucor Corp
• Asia Fastening (Us) Inc

Inventors

• Dayton Lionel E
• Lukes Richard W

Classifications

• E04B1/4157

  Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head · CPC title

• F16B25/106

  by means of a self-piercing screw-point, i.e. without removing material · CPC title

• E04B1/38

  Connections for building structures in general · CPC title

• F16B25/10

  Screws performing an additional function to thread-forming, e.g. drill screws {or self-piercing screws} · CPC title

• F16B25/0084

  characterised by geometric details of the tip · CPC title