Rotary shaft

The rotating shaft with a D-shaped tip and concave recess provides secure attachment and efficient removal of knobs by varying the applied force, addressing the challenges of existing technologies that rely on frictional forces.

WO2025070389A1 Publication Date: 2025-04-03TOKYO COSMOS ELECTRIC CO LTD
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Patent Information

Application Number
PCT/JP2024/033931
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-27
Filing Date
2024-09-24
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing rotating shafts with attached knobs face challenges in efficient attachment and removal, as they can come off with either small or large forces due to reliance on frictional forces from D springs.

Method used

The rotating shaft features a root portion with a circular cross-section and a tip portion with a D-shaped cross-section and a concave recess, allowing a member to engage with the recess for secure attachment and easy detachment by varying the applied force.

Benefits of technology

This design ensures that the knob remains securely attached to the rotating shaft even with small forces, while allowing for efficient removal with larger forces, enhancing both installation and maintenance processes.

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Abstract

Provided is a rotary shaft having a configuration in which the attaching and detaching of a member such as a knob to the rotary shaft is efficiently performed, and the member does not come off with a small force but comes off with a large force. The rotary shaft has a member attached to the outer side, and has a root part and a tip part on the tip side of the rotary shaft from the root part. The root part has a columnar shape. The tip part is given a substantially D-shaped cross section by partially cutting out the columnar shape in the axial direction and forming a plane part. A recessed part is formed in a curved surface part of the tip part.
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