Spring assembly and method for manufacturing the same

Details Spring assembly and method for manufacturing the same Spring assembly and method for manufacturing the same

2008-05-20

2008-05-20

King, Bradley (Department: 3683)

Spring devices

Coil

Including end thrust member

C029S512000, C029S896910

Reexamination Certificate

active

07374157

ABSTRACT:
A manufacturing method of a spring assembly, assembles an annular plate and a compression coil spring. The method includes forming a protrusion having a tapered portion on the annular plate, and inserting a punch including a first portion having a larger diameter than an inner diameter of a tip end of the tapered portion from the tip end side into the protrusion to expand the tip end of the tapered portion. The expansion of the tip end of the tapered portion involves expanding a base portion of the protrusion, which extends the tapered portion and has a larger inner diameter than that of the tip end of the tapered portion, along a surface of an end turn of the compression coil spring.

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