Stump Cutting Tool Holder Block Shear Load Distribution
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Solution Overview
Problem
Existing stump cutting devices face challenges in securely attaching cutting tools to the rotating wheel, leading to wear and potential fastener failure due to shear loads during operation, and require multiple parts for attachment, which can cause abrasion and increase complexity.
Innovation Solution
A stump cutting apparatus featuring a wheel with radially extending tool support segments and a tool holder secured by fasteners that distribute the cutting force through a holder block, reducing shear load on fasteners and minimizing wear by using a single holder block to attach the tool holder to the wheel, thereby enhancing stability and reducing the risk of fastener failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple parts are used to attach the tool holder to the wheel, then the attachment can be achieved, but the complexity of the device increases and wear occurs at multiple interfaces
Solution Approach 1:
The patent combines multiple attachment parts into a single integrated holder block that attaches the tool holder to the cutting wheel. This single block replaces what would otherwise require multiple separate components, reducing device complexity while maintaining secure attachment. The holder block features multiple mounting surfaces and attachment points integrated into one piece, eliminating the need for separate mounting brackets, spacers, and fasteners.
Solution Approach 2:
The holder block serves multiple functions simultaneously: it provides structural support for the cutting tools, distributes shear loads across multiple attachment points, positions the tool holder at the correct radial distance from the wheel axis, and facilitates easy tool replacement. This multi-functionality reduces the need for additional specialized components.
2Device complexity
If cutting tools are attached directly to the wheel, then the attachment is simple, but the shear load on fasteners causes wear and potential failure
Solution Approach 1:
The holder block acts as an intermediary component between the cutting wheel and the tool holder. It absorbs and distributes the shear loads generated during cutting operations across multiple attachment points on the wheel, preventing concentrated stress on single fasteners. This intermediary structure protects the wheel and fasteners from direct exposure to high cutting forces.
Solution Approach 2:
The holder block is designed with sufficient mass and structural rigidity to cushion and absorb the shock loads and shear forces generated during cutting. This pre-engineered cushioning capability protects the attachment system from sudden load spikes that would otherwise cause fastener failure or wheel damage.
3Ease of operation
If the tool holder is positioned closer to the wheel axis, then the attachment is easier, but the cutting effectiveness decreases due to reduced radial distance
Solution Approach 1:
The holder block extends radially outward from the wheel axis, positioning the tool holder at the optimal cutting radius. This radial extension ensures that cutting tools engage the stump at maximum effective distance from the axis, maximizing cutting force while the block's structure facilitates easy attachment to the wheel face.
Data Source
Figure 1a~1c
Figure 2
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AI summary
A stump cutting apparatus (10) including a cutting wheel (12) with a plurality of tool holders (14) secured to the cutting wheel. A plurality of apertures (102) located in each of the tool holders. Each of said apertures having a cutting tool or tooth (114) mounted therein whereby each tool holder supports more than one cutting tool or tooth.