Method of making a coil spring

Details Method of making a coil spring Method of making a coil spring

1997-05-29

1998-10-20

Hail, III, Joseph J.

Metal deforming

By deflecting successively-presented portions of work during...

To form helical coil or tube

72135, B21D 1108, B21F 302

Patent

active

058230351

ABSTRACT:
A method of making a coil spring wherein the external surfaces of the convolutions have cylindrical major portions and flats which abut the neighboring convolutions when a spring is compressed flat under load. This reduces the likelihood of radial displacement of one or more convolutions under load and the likelihood of a reduction of the axial length of the coil spring when in its unstressed condition subsequent to being repeatedly compressed flat under load. The external surface of each convolution can be provided with one or two flats, and the planes of the two flats preferably make a small acute angle if the coil spring is caused to assume an arcuate shape when in actual use.

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