Locking apparatus for blind fasteners
US4919576A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Jan 26, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B19/1054
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A locking apparatus for blind fasteners providing improved yield and fatigue performance of the blind fasteners is disclosed. The locking apparatus utilizes a locking collar which will slide over the fastener stem and within the tubular rivet sleeve of the fastener without preforming into the locking groove on the stem. The locking collar is formed so that upon the pulling of the stem during installation of the blind fastener, specially formed tapered regions in the locking collar then adjacent the locking groove on the stem cause the region of the locking collar immediately thereabove to be encouraged tightly inward against the locking groove to provide a particularly tight fit in the locking groove. In an alternate embodiment, the locking collar is formed so that upon pulling of the stem during installation of the blind fastener, a specially formed locking collar buckles inward to pack tightly into the locking groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.