Blind fastener assembly

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends

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Details

411 43, F16B 1910

Patent

active

043646972

ABSTRACT:
A pull-type blind fastener assembly includes a mandrel, expander, sleeve and lock collar. The expander extends through aligned holes in at least two workpieces, that are to be joined and has an enlarged head and a shank portion with a pair of conical tapered surfaces separated by a constant diameter surface thereon, adjacent the blindside end thereof. The tubular sleeve has a maximum thickness portion adjacent one end, an intermediate portion of medium radial thickness and a minimum radial thickness portion adjacent the other end. When an axial force is exerted on the mandrel by means of a conventional pulling tool, the minimum sleeve thickness portion is forced successively over the first and second conical expander surfaces where it is expanded, and a radially outwardly extending bulb begins to form at approximately the intersection between the minimum and medium thickness portion adjacent the other end. When an axial force is exerted on the mandrel by means of a conventional pulling tool, the minimum sleeve thickness portion is forced successively over the first and second conical expander surfaces where it is expanded, and a radially outwardly extending bulb begins to form at approximately the intersection between the minimum and medium thickness portions of the sleeve. Continued axial force on the mandrel causes the leading end of the sleeve to contact the blindside workpiece surface, whereupon the bulb further expands to its full radial diameter and propagates along the axial length of the sleeve in a ripple manner until it contacts and clamps against the blindside surface of the workpiece at a point spaced radially from the point of contact of the sleeve leading end.

REFERENCES:
patent: 2887003 (1959-05-01), Brilmyer
patent: 3107572 (1963-10-01), Orloff
patent: 3262353 (1966-07-01), Waeltz et al.
patent: 3277771 (1966-10-01), Reynolds
patent: 3369442 (1968-02-01), Darby et al.
patent: 3489056 (1970-01-01), Blakeley
patent: 4089247 (1978-05-01), Dahl et al.

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