Self-tapping screw
US8182185B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2008 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Jul 18, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B25/0052
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A screw (11) includes at least one thread (21) arranged on the screw shaft (12); circumferentially surrounding the shaft (12) at least in some regions, and having a thread pilot (22) located in the free region (15) of the shaft (12) and a plurality of recesses (31) provided in the thread (21) and opening radially outwardly, with the recesses (31) each having a first limiting wall (32) adjacent to the thread pilot (22) and a second limiting wall (33) remote from the thread pilot (22), and a plurality of cutting bodies (26) formed of a material having a hardness greater than a hardness of the thread, located in the recesses (31) formed in the thread (21) and having each a longitudinal axis (27) and an outer surface (28) surrounding the axis (27) at a distance therefrom, with the recesses (31) each having a bearing section (34) with a plurality of generatrices extending substantially along a course of the thread (21) for receiving, at least in some regions, the outer surface (28) of a respective cutting body (26).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.