Weldless building structures

Patent metadata

Field	Value
Publication number	US-9797430-B2
Application number	US-201614988314-A
Country	US
Kind code	B2
Filing date	Jan 5, 2016
Priority date	Feb 19, 2010
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

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

What is claimed is:

1. 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.

2. The stand-off fastener of claim 1 , where the head portion further comprises a shape with two or more flat sides.

3. The stand-off fastener of claim 1 , 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.

4. The stand-off fastener of claim 3 , 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.

5. The stand-off fastener of claim 4 , 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.

6. The stand-off fastener of claim 1 , where the anchor portion is a rolled collar.

7. The stand-off fastener of claim 1 , where the stand-off portion has a length which is greater than a length of the threaded portion.

8. The stand-off fastener of claim 1 , where the width of the anchor portion is larger than a width of the stand-off portion.

9. The stand-off fastener of claim 1 , 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.

10. The stand-off fastener of claim 1 , 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.

11. The stand-off fastener of claim 1 , where a seat portion is located between the head portion and the threaded portion.

12. 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.

13. The stand-off fastener of claim 12 , where the head portion further comprises a shape with two or more flat sides.

14. The stand-off fastener of claim 12 , 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.

15. The stand-off fastener of claim 14 , 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.

16. The stand-off fastener of claim 15 , 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.

17. The stand-off fastener of claim 12 , where the anchor portion is a rolled collar.

18. The stand-off fastener of claim 12 , where the stand-off portion has a length which is greater than a length of the threaded portion.

19. The stand-off fastener of claim 12 , where the width of the anchor portion is larger than a width of the stand-off portion.

20. The stand-off fastener of claim 12 , 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.

21. The stand-off fastener of claim 12 , 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.

22. The stand-off fastener of claim 12 , where a seat portion is located be

Assignees

• Nucor Corp
• Asia Fastening (Us) Inc

Inventors

• Dayton Lionel E
• Lukes Richard W

Classifications

• E04B1/24

  the supporting parts consisting of metal · CPC title

• F16B25/0084

  characterised by geometric details of the tip · CPC title

• E04B2001/2496

  Shear bracing therefor · CPC title

• E04B1/4157

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

• E04B2001/2418

  Details of bolting · CPC title