Co-conic fastener and fastening method
US4934857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1988 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Oct 11, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/75
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fastener for connecting structures having significantly different coefficients of thermal expansion (CTE) which substantially eliminates thermal stress with varying ambient temperatures, while allowing said structures to be either abutting or spaced from each other. A frusto-conical bore through a wall of a first structure receives a frusto-conical surface of an elongated fastener which is coincident with said bore. The fastener has a base secured to a second structure. A shoulder is formed on the first structure around the narrow end of the bore, the shoulder having a frusto-conical outer edge. A flange member is secured to the vertex end of said fastener, the flange member having a surface configured to engage the outer edge in a coincident relationship. The fastener is tightened to bring both pairs of coincident conical surfaces into pressure contact. Both parts of conic surface preferably have a common vertex which lies outside the fastener. The fastening system is particularly useful in cases where low-CTE plates or other contiguous structures are to be fastened together by a high-CTE fastener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.