Title:
COIL SPRING
Document Type and Number:
WIPO Patent Application WO/2022/123960
Kind Code:
A1
Abstract:
A coil spring according to one embodiment of the present invention is formed from a wire rod (2) having one end and the other end. The wire rod (2) of this coil spring has, in terms of cross-section of the wire rod (2): a functional portion (13) formed of a circular cross-section portion (30); a square cross-section portion (31) having a substantially square cross-section and including an end turn portion (11) (12); and a tapered portion (32). One side of the cross-section of the square cross-section portion (31) has a length smaller than or equal to the root of 1/2 of the diameter of the circular cross-section portion (30) of the wire rod (2). From the circular cross-section portion (30) toward the square cross-section portion (31), the tapered portion (32) has a cross-sectional shape changing from a circular shape to a substantially square shape and has a decreasing cross-sectional area.
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| JP2010173555 | MASTER CYLINDER |
Inventors:
NISHIZAWA SHINICHI (US)
MORIYAMA SENRI (JP)
DAI FANG (US)
FURUSE TAKESHI (JP)
MORIYAMA SENRI (JP)
DAI FANG (US)
FURUSE TAKESHI (JP)
Application Number:
PCT/JP2021/040372
Publication Date:
June 16, 2022
Filing Date:
November 02, 2021
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
International Classes:
F16F1/06
Foreign References:
| JPS51129554A | 1976-11-11 | |||
| JPS5452257A | 1979-04-24 | |||
| JPS62155342A | 1987-07-10 | |||
| JPS151179Y1 | ||||
| US3727902A | 1973-04-17 | |||
| US1963054A | 1934-06-12 | |||
| JPS5711743A | 1982-01-21 | |||
| JPS56141431A | 1981-11-05 | |||
| JP2000337415A | 2000-12-05 | |||
| JPS5452257A | 1979-04-24 |
Attorney, Agent or Firm:
S & S INTERNATIONAL PPC (JP)
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