Stump Cutter Tooth With Split Ring Fastening
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Solution Overview
Problem
Stump cutting tools face frequent replacement due to harsh operating conditions, leading to high material and labor costs, as well as potential fastener failure, due to dulling, breaking, or bending of cutting teeth and fasteners during stump cutting operations.
Innovation Solution
A cutting tool design featuring a cutting tooth with a shank and expandable split ring, secured to a tool holder with a beveled engagement surface and threaded fasteners, allowing for efficient attachment and indexing, reducing chip broadcasting and stress on fasteners, and enabling more effective use of the cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cutting teeth are used in stump cutting operations, then the cutting operation can be performed, but the cutting teeth frequently dull, break, or bend requiring replacement
Solution Approach 1:
The cutting tooth is divided into separate functional components: a carbide insert for cutting, a head portion for structural support, and a shank for mounting. This segmentation allows the hard carbide cutting portion to be replaced independently when worn, while retaining the structural components.
Solution Approach 2:
The cutting tooth uses composite construction combining carbide (for hardness and wear resistance) with steel head and shank portions (for toughness and structural support). This composite approach optimizes each component for its specific function, improving overall durability.
2Ease of manufacture
If conventional fastening methods are used to secure cutting teeth to the wheel, then the teeth can be attached, but the fasteners may break or shear under load
Solution Approach 1:
The fastening system is segmented into multiple independent fasteners distributed around the cutting tooth, rather than relying on a single fastener. This distributes the mechanical load and prevents single-point failure.
Solution Approach 2:
The design incorporates washers and proper fastener selection to cushion and distribute loads before they reach the fastener connection points, preventing premature fastener failure under the harsh loading conditions of stump cutting.
3Productivity
If only a portion of the carbide cutting bit is used for cutting, then the cutting operation is effective, but the remaining portion is wasted
Solution Approach 1:
The carbide portion is segmented into a removable insert that can be replaced when worn. The insert design allows the full carbide portion to be utilized through multiple cutting edges or by replacing the insert rather than the entire tool.
Solution Approach 2:
The design allows for recovery and reuse of the carbide insert by replacing it when one cutting edge becomes dull, rather than discarding the entire carbide bit. Multiple cutting edges on the insert maximize material utilization.
Data Source
Figure 1
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Figure 5A~7
AI summary
A cutting tool (10) for use with a stump cutting apparatus of the type utilizing a cutting wheel or drum rotating about a rotational axis wherein the cutting tool is removably attached to the cutting wheel or drum. The cutting tool comprises a tool holder (14), said tool holder (14) having a base portion (20) with first and second apertures (60, 62) and a head portion (28) having a boss (42). The boss (42) has first and second ends (44, 46) and an aperture (48) extending between said first and second ends (44, 46) as well as first and second shoulders (50) located adjacent the first and second ends (44, 46) of the boss (42). The present invention also relates to a method for configuring the shape of a tool holder (14) for use in attaching a cutting tool (10) to a cutting wheel (12) of a stump cutting apparatus.