Industries & Applications

By utilizing our spring manufacturing technology that we have nurtured over the years,


we have solved a whole host of spring-related issues in various fields.

Anti-vibration Measures For Seismic Isolation Stands

Springs used: Compression coil springs

Anti-vibration Measures For Seismic Isolation Stands

Springs used: Compression coil springs

  • Request: Anti-Vibration Measures for Seismic Isolation Stands
    Request: Anti-Vibration Measures for Seismic Isolation Stands
    We received a request that a client wanted to carry out an experiment using compression coil springs for vertical shaking and tension springs for horizontal shaking of seismic isolation stands. The specifications required by our client were as follows.

    [Specifications of compression coil spring]
    Spring constant: 0.217 N/mm, when mounted: 112 mm, load: 49 N (5 kgf)
    Maximum height: 87 mm, center diameter: 105 mm, wire diameter: 3.5 mm or less

    [Specifications of tension spring]
    Spring constant: 0.0093 N/mm, free length: 160 mm
    When mounted: 360 mm, at maximum: 560 mm
    Coil outer diameter: φ17 mm or less

Our Solutions

The design is as follows to maintain the free length and satisfy the spring constant and stroke.

Coil spring:
φ3.5 mm, center diameter φ105 mm, free length 343.5 mm, number of active coils 6, total number of coils 8

Tension spring:
Wire diameter: φ0.6 mm, center diameter φ10 mm, free length 160 mm, number of coils 136.5
For the compression coil spring, it was feared that there would be a large variation in diameter due to the large D/d, but the spring was produced with an emphasis placed on its shape because the client requested that they wanted to carry out a trial test.

Examples of how we respond to specific requirements

As a result of the springs being tested by the client, their validity was confirmed and thus the experiments were successful. On this occasion, however, because of matters relating to space for the test, it was a test done up to 70% of the maximum amplitude in the lateral direction. There was no problem with the compression coil spring, but with the tension spring, it was necessary to ensure a longer stroke to satisfy the amplitude.

We received a design request to change the specifications of the tension spring again for a final test with a maximum amplitude of 100%.

  • Request a Design Further Inquiries
  • Our Oder-To-Deliverly Process
  • supporting meterials
  • Tokai Spring's Forum