Rotary device and chair including rotary device

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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

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.

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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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