Joseph W Muschella

US Patent:

53082850, May 3, 1994

Filed:

Feb 3, 1992

Appl. No.:

7/829496

Inventors:

Gerald Malen - Troy MI
William Deason - Mt. Clemens MI
Joseph Muschella - Troy MI

Assignee:

The Cold Heading Company - Detroit MI

International Classification:

B21H 302
F16B 4300
B21D 5320

US Classification:

470 4

Abstract:

A method for fabricating a fastener and washer assembly wherein the washer is permanently retained on the fastener by an annular raised portion on the shank of the fastener. The annular raised portion and the inner diameter of the washer are mutually formed so as to promote elastic deformation of both the raised portion and the washer when the washer is forced over the raised portion to be retained on the fastener. The method allows the fastener and the washer to be fully fabricated and processed prior to assembly, including such desirable steps as heat treating and plating of both the fastener and the washer. The annular raised portion is formed by a pair of converging annular surfaces which define a predetermined diameter. The washer has an inner diameter surface having a pair of chamfered edges. The washer is assembled onto the shank of the fastener by forcing the chamfered edge of the washer against and past the annular raised portion.