Screw having a tapered thread
US6254326A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Jun 4, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B25/0021
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a screw (1) for mutual fastening of two components (2 and 3) there is provided a shank (4) with a thread (6), an unthreaded shank portion (7) and a screw head (5). The end region (8) of the thread (6) adjacent to the unthreaded shank portion (7) tapers with constant thread pitch (S), and so the tapering end region (8) of the thread (6) forms a kind of frustoconical envelope surface (10) upon rotation of the screw (1). During setting of the screw (1) and during over-torquing thereof, the end region (8) of the thread (6) acts as a kind of milling cutter and makes a frustoconical opening (13) in the component (3). The thread flights in the tapering end region (8) can then be braced against the wall of this opening (13), so that mutual contact pressure between the components (2 and 3) is possible despite over-torquing of the screw (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.