---
publication_id: "OT-2026-000001963"
title: "Extension/contraction device and wire tensioning device"
published_at: "2026-09-15T19:09:47.917802Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000001963"
categories:
  - "tools-tooling/clamping-tools"
keywords:
  - "b25b25/00"
  - "b25b25/00"
  - "b25b25/00"
  - "h02g1/04"
  - "b25b25/00"
  - "b25b25/00"
---

# Extension/contraction device and wire tensioning device

## Abstract

An extension/contraction device that is used when tensioning a wire is provided. This extension/contraction device comprises an extension/contraction device body and a power unit. The extension/contraction device body has: an outside tubular part; an inside tubular part inserted into the outside tubular part from one axial end thereof; a moving part that has a threaded shaft that passes through the outside tubular part and the inside tubular part, and a nut that is fixed to the other axial end of the inside tubular part and is screwed onto the threaded shaft; and an operating part that rotates the threaded shaft about the center axis to move the nut along the threaded shaft. The power unit is detachably attached to the extension/contraction device body. An engagement part that engages with the operating part, and a motor for rotating the engagement part, are also provided.