Method for preventing cold welding especially of blind rivets

Details Method for preventing cold welding especially of blind rivets Method for preventing cold welding especially of blind rivets

1994-10-24

1995-12-12

Bryant, David P.

Metal working

Method of mechanical manufacture

Assembling or joining

295241, 295252, B23P 2500

Patent

active

054738067

ABSTRACT:
A method for avoiding cold welding of blind rivets, especially for the production of rivet connections between load carrying components in aircraft construction uses a not yet cured, curable adhesive to perform three functions, namely as a lubricant during setting of the blind rivet when the adhesive is not yet cured, to prevent cold welding between the shaft and the sleeve of the rivet, and as a seal and bond when the adhesive has cured. The blind rivet has a shaft or mandrel with a thickened end and a pulling end. The shaft has a conical section tapering from the thickened end to the pulling end. Grooves run around at least the conical section. The rivet mandrel or shaft is axially received in a rivet sleeve with a settable head. The not yet cured adhesive is provided in the grooves, especially along the conical section of the blind rivet. After the rivet has been set the adhesive hardens in the seam or gap to form the seal and bond. The result is a set blind rivet that has a structural strength equivalent to that of a solid rivet so that it can also meet higher structural strength requirements.

REFERENCES:
patent: 2759082 (1956-08-01), Rea
patent: 3639137 (1972-02-01), Marinelli
patent: 3772957 (1973-11-01), Newton
patent: 4536524 (1985-08-01), Hart et al.
patent: 4659268 (1987-04-01), Del Mundo et al.
patent: 4904133 (1990-02-01), Wright
Standard ABS0219, pp. 1 and 2; Issue Sep. 1982 Revision 1, Jan. 1984.
Standard No.: NAS 1921, 2 pgs., Aerospace Industries Association of America, Inc.

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