Spring Retainer Sleeve for Secure Rotating Tool Shank Locking
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Solution Overview
Problem
Current retainer designs for cutting tools in earth working, mining, and construction applications allow excessive axial movement, leading to tools coming out of the holder, bending, or breaking, and wear out prematurely due to improper contact with the rotating tool shank.
Innovation Solution
A retainer sleeve with a longitudinal external tab engaging an internal recessed groove of a cutting bit holder and two internal radial tabs engaging a recessed groove in a rotating tool shank, made of compressible material like 1070 or 65 Mn spring steel, to prevent axial movement and secure the tool during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the force to install the tool with the retainer is increased to prevent tool removal, then the tool security improves, but the installation difficulty increases
Solution Approach 1:
The retainer is designed with spring pressure providing dynamic, elastic force that automatically adjusts to secure the tool. The spring mechanism allows the retainer to exert continuous radial pressure on the tool shank while accommodating installation variations, eliminating the need for excessive installation force while maintaining secure tool retention throughout operation.
2Stability of the object's composition
If the retainer contacts the shank at the top to secure the tool, then the tool stability improves, but the retainer wear increases
Solution Approach 1:
The retainer applies localized radial pressure at multiple contact points around the tool shank rather than concentrating force at the top. This distributes the mechanical stress across the retainer surface, preventing localized thinning and wear while maintaining tool stability through uniform radial constraint.
3Ease of operation
If the retainer allows tool movement to facilitate installation, then the installation ease improves, but the tool may come out causing bending or breaking
Solution Approach 1:
The spring-pressurized retainer provides dynamic elastic force that allows controlled movement during installation while automatically securing the tool in its final position. The spring mechanism accommodates installation variations and tool positioning adjustments, then maintains constant radial pressure to prevent tool removal during operation, eliminating both excessive installation force and tool retention failures.
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 solution effectively prevents tools from coming out of the holder, reduces wear, and facilitates easier installation by exerting spring pressure and limiting axial movement, thus enhancing tool stability and longevity.
Implementation Method 1
made of compressible material like 1070 or 65 Mn spring steel, to prevent axial movement and secure the tool during operation
Implementation Method 2
The cylindrical retainer sleeve is made of a compressible material
Data Source
AI summary
A tool retainer is provided. The tool has a retainer sleeve having a longitudinal external tab to engage with an internal recessed radial groove with a tool holder, and wherein the retainer sleeve has two internal radial tabs that engage with a recessed groove in a rotating tool shank. A cutting tool assembly including a cutting bit and the retainer sleeve is provided.