Strain adjustment device

The strain adjustment device maintains tension on tie rods by using a biasing mechanism to automatically tighten nuts or couplers, addressing the issue of wood shrinkage in tie-down systems, ensuring structural stability during natural disasters.

JP7893794B2Active Publication Date: 2026-07-22JAPAN HOUSING CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
JAPAN HOUSING CO LTD
Filing Date
2023-10-25
Publication Date
2026-07-22

AI Technical Summary

Technical Problem

Existing tie-down systems in wooden buildings face challenges in maintaining tension on tie rods due to wood shrinkage, which can lead to loosening and loss of structural integrity during natural disasters like typhoons or earthquakes.

Method used

A strain adjustment device that includes an inner cover engaging with nuts or couplers, an outer cover fixed to the structural frame, and a biasing means applying a rotational force to maintain tension by automatically tightening the nuts or couplers when wood shrinkage occurs.

Benefits of technology

The device ensures that tie rods remain tensioned, preventing uplift of structural floors and walls by automatically adjusting for strain caused by wood shrinkage, thereby enhancing the stability of the building.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide a new technology capable of adjusting a strain in a tie-rod that could happen due to shrinkage of lumber and the like in a tie-down system.SOLUTION: A strain adjustment device is the strain adjustment device of a tie-down system which includes a tie-rod inserted in a structural skeleton of a building, and a nut screwed to the tie-rod on the structural skeleton, and in which the tie-rod is pulled upward and made to be strained by rotating the nut in a fastening direction and fastening it. The strain adjustment device includes: an inner cover engaged with a side surface of the nut; an outer cover arranged on the outside of the inner cover, and fixed with respect to the structural skeleton of the building; and energization means arranged between the inner cover and the outer cover, and for energizing a rotational force in the direction of rotating the nut in the fastening direction, between the outer cover and the inner cover.SELECTED DRAWING: Figure 8
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