Title:
COILED WAVE SPRING AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP3507801
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a coil spring preventing the abrasion and entanglement at a winding start end or a winding finish end and suppressing the occurrence of an offset load and to provide its manufacturing method.
SOLUTION: A fine band-like spring plate wire is spirally wound in the width direction, the wound wire is machined into a wave shape in the thickness direction, and a previously wound ridge section 12 and a next wound valley section 13 are superimposed. The winding start end 15 and the winding finish end 16 are curved or kept parallel with the next wound valley section 13, and they are processed so as not to cause a slide contact with fitting faces 17. When the number of waves in one winding is n=(an integer +0.5), the one-wave pitch angle α (rad) of (n-1.5) waves is expanded than the one-wave pitch angle θ(rad) of a uniform interval at least for the winding at both ends of the spring, and the one-wave pitch angle β (rad) of 1.5 waves is shrunk than the one-wave pitch angle θ of the uniform interval.
Inventors:
Kouichi Takayama
Application Number:
JP2001040889A
Publication Date:
March 15, 2004
Filing Date:
February 16, 2001
Export Citation:
Assignee:
Nippon Stainless Spring Co., Ltd.
International Classes:
F16F1/06; B21F35/00; (IPC1-7): F16F1/06; B21F35/00
Domestic Patent References:
| JP554833U |
Attorney, Agent or Firm:
Yasuo Ishii (1 outside)