---
publication_id: "OT-2026-000003290"
title: "Tool shaft coupler"
published_at: "2026-09-15T20:03:24.480628Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000003290"
categories:
  - "industrial-motion-power-transmission/rotary-motion"
keywords:
  - "a61b17/162"
  - "a61b17/162"
  - "a61b2017/00477"
  - "a61b2017/00477"
  - "a61c1/142"
  - "a61c1/142"
---

# Tool shaft coupler

## Abstract

Apparatus and methods for coupling a driving shaft and a mating tool shaft to transmit rotational forces and axial tension and compression forces between the shafts. The coupler provides for axial tension transmission through tension transmission surfaces spaced-apart from torque and compression transmission surfaces of the mating tool shaft. Reversible shaft locking means prevent accidental disconnection of the driving shaft and mating tool shaft. A separate safety lock release attachment is preferably removed during tool shaft rotation and can automatically hold the driving shaft stopped when used to release the shaft locking means for a tool change. Malfunction (e.g., improper seating) of the shaft locking means with the attachment ring in place results in a positive visual indication of the malfunction.

## 1. Drawings

[0001] Sheet 1.

[0002] Sheet 2.

[0003] Sheet 3.

[0004] Sheet 4.