Fit up swage fastener with a variable and selectively high initial clamp pre-load and method
US5125778A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1989 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | Mar 24, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B29/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fastening system including a swage type fastener including a pin and a collar adapted to be swaged into helical lock grooves in the pin and with the collar having a female thread which is threadably engageable with the helical lock grooves to selectively clamp or locate the workpieces relative to each other more or less prior to swage, with the collar thread being of a strength to deform or shear relative to the pin threads in response to a relative axial load between the pin and collar at the initiation of the swage operation but prior to swaging and in which the fastener includes a resistance member for permitting pre-clamping of the workpieces together at a selected pre-assembly pre-load while subsequently permitting sufficient relative axial movement between the pin and collar after pre-clamping such that the collar threads can be deformed or sheared prior to initiation of swage whereby the final clamp-up load of the workpieces is substantially uninhibited by the initial threaded engagement of the pin and collar threads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.