US 7,357,381 B2Granted

Method of manufacturing spring assembly

AssigneePiolax, Inc.

InventorsMasami Wakamori, Toshie Fueki

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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.

Claims18

Dependent claims

A method of manufacturing a spring assembly, which includes two annular plates and compression coil springs, said compression coil springs being assembled to said annular plates by caulking projection portions formed on said two annular plates, respectively, the method comprising:

forming both of large-diameter projection portions and small-diameter projection portions in each of said two annular plates, while forming large-diameter end turn portions, which are respectively associated with said large-diameter projection portions, and small-diameter end turn portions, which are respectively associated with said small-diameter projection portions, in said compression coil springs;
setting the large-diameter end turn portions on outer peripheries of the large-diameter projection portions;
inserting a first punch having a portion, whose diameter is larger then an inside diameter of said large-diameter projection portions, thereinto and enlarging said large-diameter projection portions in diameter thereof to the thereby assemble said large-diameter end turn portions of said compression coil springs to said annular plates;
subsequently setting said small-diameter end turn portions on outer peripheries of said small-diameter projection portions;
and
inserting a second punch having a portion, whose diameter is larger than an inside diameter of said small-diameter end turn portions, from inside diameter of said large-diameter projection portions thereinto and enlarging said small-diameter projection portions in diameter thereof to thereby assemble said small-diameter end turn portions of said compression coil springs to said annular plates,
wherein the large-diameter projection portions are arranged opposed to the small-diameter projection portions, and
wherein the outer periphery of the large-diameter projection portions is larger than the outer periphery of the small-diameter projection portions.

5 more elements

A method of manufacturing a spring assembly, which comprises two annular plates and compression coil springs, said compression coil springs being assembled to said annular plates by caulking projections formed on said two annular plates, respectively, the method comprising:

forming a first set caulking projections having a first diameter and forming a second set of caulking projections having a second diameter, which is different from said first diameter, in each of said annular plates;
forming, in said compression coil springs, a first end turn portion having a first diameter and a second end turn portion having a second diameter, which is different from said first diameter;
setting said first end turn portion on an outer periphery of said first set of caulking projections and said second end turn portion on an outer periphery of said second set of caulking projections;
and
enlarging said first diameter of said first set of caulking portions and enlarging said second diameter of said second set of caulking portions to assemble said compression coil springs to said annular plates,
wherein the first set of caulking projections arc arranged opposed to the second set of caulking projection, and
wherein the outer periphery of first set of caulking projections is different from the outer periphery of the second set of caulking projections.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/882,090Filed 1 Jul 2004
Priority: JP P.2003-1900112 Jul 2003
Published: US 2005/0017422 A127 Jan 2005
Granted: 15 Apr 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B21F 15/10
Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire: wire with sheet metal
B21K 25/00
Uniting components to form integral members
B23P 11/00
Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise
B23P 19/048
For assembling or disassembling parts: springs