Blind fastener
US4699552A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Jan 28, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B39/28
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A three piece blind fastener of the kind comprising a tubular nut having a head at one end and a tapered nose at the other end, an expansible sleeve, and a headed bolt threadedly engaged with the nut for forcing the sleeve on to the nose of the nut to form a blind head, has the thread of the nut provided with a locking zone in which the bore of the nut is constricted and, in cross sectional shape, a closed non-reentrant non-circular curve so that the nut resiliently interferes with the bolt. A die, and a method of providing the nut with the locking zone by means of the die are disclosed. The die has a tapered aperture having a cross sectional shape corresponding to the desired shape of the locking zone, and the method involves forcing the tapered nose of the nut into the aperture so as to constrict the bore, in a zone spaced from its ends, to the desired extent and impose the non-circular cross sectional shape on the constricted zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.