Corrosion resistant fastener
US4295767A · kind A · utility
Inventor
Key dates
| Filing date | Nov 26, 1979 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Nov 26, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B37/14
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A corrosion resistant screw type fastener has a carbon steel threaded shank with a die cast zinc or aluminum head, and a reformable plastic washer positioned about the shank and partly received within the head. The shank has a retaining portion having a polygonical configuration and a cylindrical portion between the retaining portion and the threads. The retaining portion has a larger cross-sectional configuration than the cylindrical portion for preventing axial movement between the head and the shank. An annular recess is formed between the head and part of the cylindrical portion for receiving the washer which is thicker than the depth of the recess. When the fastener is threaded into the work the heat and pressure generated reform the washer to completely fill the recess and provide an effective seal against corrosive elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.