Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1991-04-10
1992-08-04
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 38, 411 43, 411183, F16B 1304, F16B 3704
Patent
active
051353407
ABSTRACT:
A fastener for blind installation where only one side of a workpiece is accessible for installation of the fastener. The fastener utilizes two methods of deformation on its blind side. The fastener has a tubular body made of a ductile material with a head at one end. A separate expander nut is made of a harder material and adapted with internal screw threads. The expander is engaged by a threaded pulling mandrel attached which protrudes through the tubular fastener to be installed. The pulling mandrel engages the expander by means of the screw thread and pulls it onto the tubular sleeve which then fails in columnar buckling to form a substantial bulge and foot print on the blind side of the workpiece. The expander is then pulled at increased pressure to bulge the protruding portion of the tubular fastener above the undulation formed by the buckling of the tubular body to give a secondary source of tensile resistance under load by seating the bulged portion of the tubular body on the undulation to reinforce the foot print of the buckled column.
The mandrel is removed by unthreading and a threaded bolt is then screwed into the expander through the tubular body to provide further structural integrity to the installed blind fastener.
REFERENCES:
patent: 2959999 (1960-11-01), Wing
patent: 3236143 (1966-02-01), Wing
patent: 3651563 (1972-03-01), Volkmann
patent: 3698278 (1972-10-01), Trembley
patent: 3747656 (1973-07-01), Mortus
Hi-Shear Corporation
Mon Donald D.
Wilson Neill R.
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