Bayonet Tool Holder Coupling for Fast Rotary Brush Replacement

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Solution Overview

Problem

Existing rotary machine tools, particularly rotary brushes, experience uncontrolled movements and increased wear due to imperfect fitting with the tool holder, leading to destruction and difficulty in quick and functional replacement, especially under dirty conditions.

Innovation Solution

A bayonet connection is implemented between the drive-side and tool-side parts of the rotary machine tool, utilizing guide grooves and coupling lugs with a spring bias, allowing for a quick and tool-free detachment and attachment, even in dirty conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a flexible brush band is used in the rotary tool, then the brush can adapt to surface treatment requirements, but uncontrolled movements relative to the tool holder occur leading to increased wear and destruction

Engineering Contradiction:

Improvebrush band flexibilityVSAvoidbrush band stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The brush band is divided into multiple discrete bristle elements arranged in radial patterns, allowing each element to move independently while maintaining overall structural integrity. This segmentation prevents uncontrolled movements and reduces wear on individual elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bristle elements are arranged with varying lengths and angles relative to the brush band surface, creating an asymmetric configuration that optimizes surface treatment effectiveness while maintaining stability during rotation.

Inventive Principle:

Principle #4Asymmetry

2Reliability

If traditional locking mechanisms are used to secure the rotary tool, then the connection is stable, but the tool replacement process becomes complex and time-consuming

Engineering Contradiction:

Improvetool holder connection stabilityVSAvoidtool replacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The locking mechanism transitions from a static multi-step process to a dynamic one-step rotation action. The bayonet connection allows the tool to be quickly locked or unlocked by a simple rotational movement, significantly reducing tool replacement time while maintaining connection stability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The complex multi-component locking mechanism is extracted and replaced with a simplified bayonet connection system that achieves the same locking function through a single rotational element, reducing complexity and operation time.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If the tool holder design allows for quick release, then tool replacement is fast, but the connection stability and precision are compromised

Engineering Contradiction:

Improvetool replacement speedVSAvoidtool positioning precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The bayonet connection uses a dynamic rotational locking mechanism that provides precise positioning through angular detents. The connection transitions from an inserted to a locked position through rotation, ensuring both quick replacement and precise tool positioning.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The traditional mechanical locking system with multiple components is replaced with a streamlined bayonet connection that uses rotational mechanics to achieve both quick release and precise positioning in a single motion.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Reliability

If the tool holder components are tightly coupled, then connection stability is improved, but detachment becomes difficult especially under dirty conditions

Engineering Contradiction:

Improveconnection stabilityVSAvoidtool detachment ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The connection system uses a rotational dynamic mechanism that allows easy detachment through a simple unlocking rotation motion. The bayonet connection design maintains stability during operation but enables quick release by reversing the rotational locking action.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Instead of pulling or unscrewing to detach, the bayonet connection uses the inverse approach: a rotational motion that reverses the locking action. This inversion of the detachment mechanism makes it equally easy to detach as it is to lock, even in dirty conditions.

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The bayonet connection ensures a stable, tool-free, and efficient coupling and decoupling of the rotary tool, preventing wear and facilitating easy tool replacement, even in harsh working environments.

Implementation Method 1

with a spring bias

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12583078B2Rotary machine tool

Publication Date: 2026.03.24 MONTI WERKZEUGE GMBH

AI summary

A rotatably driven machine tool has a tool holder rotatable about an axis and having at least one drive-side part and a tool-side part, both parts being detachably connected to each other for picking up and holding a rotary tool. A bayonet connection couples the tool-side part and the drive-side part to each other.