Title:
TENSION SPRING
Document Type and Number:
WIPO Patent Application WO/2024/089879
Kind Code:
A1
Abstract:
Provided is a tension spring that is capable of stabilizing the shape thereof even when a large initial tension is applied thereto. The tension spring comprises: an outer coil part 3 that has a plurality of turns 3a in the axial direction and that is formed in a coil shape; and an inner coil part 5 that has a plurality of turns 5a in the axial direction, that is formed in a coil shape with a diameter smaller than that of the outer coil part 3, and that is disposed within the outer coil part 3. Each turn 5a, 3a of one of the outer coil part 3 and the inner coil part 5 is fitted in between the corresponding adjacent turns 3a, 5a of the other of the outer coil part 3 and the inner coil part 5, so that an initial tension is generated by allowing a portion between the adjacent turns 3a, 5a of at least one of the outer coil part 3 and the inner coil part 5 to increase from a free state within a range smaller than the wire diameter of the other of the outer coil part 3 and the inner coil part 5, and radial displacement, due to the initial tension, between the turns 3a of the outer coil part 3 and the turns 5a of the inner coil part 5 is suppressed.
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Inventors:
HIRATA TAKAFUMI (JP)
HOTODA YUKI (JP)
ISHIYAMA YUTA (JP)
HOTODA YUKI (JP)
ISHIYAMA YUTA (JP)
Application Number:
PCT/JP2022/040381
Publication Date:
May 02, 2024
Filing Date:
October 28, 2022
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
International Classes:
F16F1/12; F16F3/04
Domestic Patent References:
| WO2021162089A1 | 2021-08-19 |
Foreign References:
| JP2007107678A | 2007-04-26 | |||
| JPS5058157U | 1975-05-30 | |||
| JP2002248023A | 2002-09-03 | |||
| JPH0550545U | 1993-07-02 | |||
| US5695421A | 1997-12-09 |
Attorney, Agent or Firm:
KIUCHI Mitsuharu et al. (JP)
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