Method of manufacturing spring assembly

Details Method of manufacturing spring assembly Method of manufacturing spring assembly

2008-04-15

2008-04-15

Siconolfi, Robert A. (Department: 3683)

Spring devices

Coil

Including end thrust member

C267S287000, C029S512000, C029S896910

Reexamination Certificate

active

10882090

ABSTRACT:
Large-diameter projection portions and small-diameter projection portions are formed in each of the two annular plates, while large-diameter end turn portions, which are respectively associated with large-diameter projection portions, and small-diameter end turn portions, which are respectively associated with small-diameter projection portions, are formed in the compression coil springs. Then, a punch having a diameter portion, whose diameter is larger than the inside diameter of the large-diameter projection portion, is inserted thereinto and increases the diameter thereof. Consequently, the large-diameter end turn portions of the compression coil springs are assembled to each of the annular plates. Subsequently, the punch having a portion, whose diameter is larger than the inside diameter of the small-diameter end turn portion is inserted from the inside of each of the enlarged large-diameter projection portions into the small-diameter projection portion and increases the diameter of the small-diameter projection portion.

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