Rotary device and chair including rotary device

The rotary device addresses the issue of large axial height in swivel chairs by incorporating a spring-activated elastic loop and rolling elements, ensuring smooth operation and a thin design with extended service life.

EP4767872A1Pending Publication Date: 2026-07-01KOYO CORP
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
KOYO CORP
Filing Date
2025-12-19
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Existing rotary devices, such as swivel chairs, have a large axial height and are not suitable for thin designs, limiting their applications.

Method used

A rotary device with a first substrate, a central shaft, an elastic loop, and a driver mechanism that allows the device to return to its initial state automatically, featuring a flat and thin design with reduced friction and stress concentration through rolling elements and a spring-activated elastic loop.

Benefits of technology

The device rotates smoothly and automatically returns to its initial state, maintaining a thin profile and extending service life through reduced stress concentration and friction.

✦ Generated by Eureka AI based on patent content.

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Abstract

A thin rotary device and a chair including the rotary device are provided. The rotary device includes a first substrate (10), a central shaft (20) protruding upward from an upper surface of the first substrate (10), at least one support (30) protruding upward from the upper surface of the first substrate (10), an elastic loop (40) looped over the central shaft (20) and the support (30), a second substrate (70) covering the first substrate (10) and joined to the first substrate (10) in a manner rotatable about the central shaft (20), and a driver (50) located in the elastic loop (40) and rotatable integrally with the second substrate (70) to press the elastic loop (40). The driver (50) is displaced from an initial position in response to rotation of the second substrate (70) to elastically deform the elastic loop (40). The driver (50) is urged to the initial position by a spring force of the elastically deformed elastic loop (40) to cause the second substrate (70) to return to an initial state.
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Citation Information

Patent Citations

  • swivel chair

    JP1990019340U

  • SWIVEL SEAT WITH RECALL DEVICE.

    DE1919669U

  • JP1975006466A

  • Self-orienting revolving fixture

    US3637185A

  • Swivel plate device

    US5779309A