Fastening arrangement

Details Fastening arrangement Fastening arrangement

1997-05-12

1998-11-03

Saether, Flemming

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

411399, 411415, F16B 2500

Patent

active

058299351

ABSTRACT:
A fastener assembly connects two layers of different hardness in a panel. e assembly has a screw and has a mechanism for boring through the softer layer comprised of a collar of material softer than the material of the screw. The screw is tapped into the collar and has a bit for boring through the harder layer of the panel. The screw's head fits into the collar so that the screw and collar can be countersunk together into the softer layer of the panel. The collar has a lead end having a leading cutting edge for drilling into the softer layer of the panel. The collar also has a trailing end having a frustoconical skirt on which is located a trailing cutting edge. The torque to rotate the screw in the collar is greater than a torque to rotate the collar in the softer layer of the panel. But the torque to rotate the screw in the collar is less than the torque to rotate the screw in the harder layer of the panel.

REFERENCES:
patent: 3478639 (1969-11-01), Gruca
patent: 3500713 (1970-03-01), Bell
patent: 4862664 (1989-09-01), Romine
patent: 4881861 (1989-11-01), Hewison
patent: 4959938 (1990-10-01), De Caro
patent: 5449257 (1995-09-01), Giannuzzi

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