Elastomeric Coated Bushing for Cutting Tool Mounting Assembly
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Solution Overview
Problem
Existing cutting tool mounting assemblies face issues with stress and wear between the cutting bit and the base or support block, leading to premature failure, with current solutions like bushings causing rust and being difficult to remove, or sleeves that accelerate base wear.
Innovation Solution
A cutting tool mounting assembly featuring a bushing with elastomeric layers between the shoulder and base, and the shank portion and receptacle, which reduces stress and wear while allowing for easy removal by isolating metal surfaces from environmental conditions and preventing rust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bushing is press fit into the base or support block, then the cutting tool mounting assembly provides reduced stress and wear between components, but the bushing becomes difficult to remove after long operation due to rust
Solution Approach 1:
The patent introduces an intermediary substance (rust preventive compound or elastomeric coating) between the bushing and the base receptacle. This intermediary layer prevents direct metal-to-metal contact and rust formation, allowing the bushing to be easily removed after operation while still providing the stress-reducing function during use.
Solution Approach 2:
The patent changes the surface properties of the bushing by applying coatings or compounds that alter friction and adhesion characteristics. This parameter change allows the bushing to remain securely in place during operation (reducing stress) while enabling easy removal afterward (preventing rust bonding).
2Ease of operation
If a sleeve is used as a slip fit into the base or support block with an external retainer, then the sleeve is easier to remove, but the base or support block wears quicker
Solution Approach 1:
The patent uses an intermediary bushing component with protective coatings as a mediator between the cutting tool mounting assembly and the base. This intermediary structure protects the base from direct wear while still allowing easy removal of the bushing itself, resolving the contradiction between base durability and component replaceability.
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 elastomeric coated bushing arrangement effectively reduces wear on the base, minimizes stress, and facilitates easy removal, extending the useful life of the assembly components while preventing rust.
Implementation Method 1
a first elastomeric layer positioned between the shoulder of the bushing and the front portion of the base
Implementation Method 2
A first elastomeric layer is positioned between the shoulder of the bushing and the front portion of the base and a second elastomeric layer is positioned between the outer surface of the shank portion and the inner wall of the receptacle
Data Source
AI summary
A cutting tool mounting assembly adapted for receiving a cutting tool includes a base having a bottom portion and a front portion that defines a receptacle having an inner wall and a bushing configured for receipt in the receptacle of the base. The bushing includes: a forward face defining an aperture for receiving the cutting tool; a shoulder generally opposite the forward face, the shoulder configured for cooperating with the front portion of the base; and a shank portion extending rearward from the shoulder, the shank portion having an outer surface configured for cooperating with the inner wall of the receptacle. A first elastomeric layer is positioned between the shoulder of the bushing and the front portion of the base and a second elastomeric layer is positioned between the outer surface of the shank portion and the inner wall of the receptacle.