Weldless building structures
US8529178B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 18, 2011 |
| Grant date | Sep 10, 2013 |
| Priority date | — |
| Expiry date | Feb 27, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B2001/2496
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.