Tapered Bit Holder Shank for Milling Equipment
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Solution Overview
Problem
Existing bit holder and bit block combinations require complex configurations and significant force for assembly and disassembly, lacking a universal solution for multiple bore configurations, which complicates the operation of road milling, mining, and trenching equipment.
Innovation Solution
A bit holder design featuring a cylindrical shank with a 7.0-degree taper surface, a flared middle portion, and a 45-degree tapered rear flange, allowing for easy insertion and extraction with a non-locking taper interference fit, and incorporating wedge cutouts for tool-assisted removal, providing a robust and versatile solution for various bit block configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non-locking taper configuration with approximately one degree of taper per side is used, then the bit holder can be easily inserted with minimal force (approximately 1/2 to 1 1/4 inch insertion distance), but the retention strength and stability of the bit holder in the bit block may be insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the taper angle to approximately one degree per side, which balances the insertion force requirement with retention strength. This specific angular parameter enables the shank to be forced only 1/2 to 1 1/4 inch into the bit block bore while maintaining adequate retention during use, resolving the contradiction between ease of operation and reliability.
2Reliability
If a frustoconical shape taper of approximately 5.5 degrees per side is used in the outer 1/2 axial length of the bit block bore, then the bit holder can be retained more securely, but the insertion force and complexity of the assembly process increase
Solution Approach 1:
The patent applies local quality by creating a bit block bore with two distinct zones: the outer 1/2 axial length has a frustoconical shape taper of approximately 5.5 degrees per side for secure retention, while the inner portion is cylindrical for easy insertion. This spatial differentiation of bore properties allows the system to achieve both secure retention and manageable insertion complexity.
3Adaptability or versatility
If multiple bit block bore configurations are supported, then the adaptability and versatility of the bit holder system is improved, but the device complexity and difficulty of manufacturing increase
Solution Approach 1:
The patent applies universality by designing a bit holder shank with a tapered configuration that can function with multiple types of bit block bores (both frustoconical and cylindrical configurations). The tapered shank geometry provides a universal interface that adapts to different bore types, enabling one bit holder design to serve multiple functions across different drilling applications and reducing the need for specialized holders for each bore type.
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
Enables efficient and secure mounting of the bit holder in multiple bit block configurations with reduced assembly force, facilitating easy removal and enhancing tool compatibility, thus improving operational efficiency and durability in road milling and mining applications.
Implementation Method 1
allowing for radial compression when inserted in a bit block bore having sufficient radial force between that shank and bore to maintain the bit holder in the bit block during use
Data Source
AI summary
An improved bit holder includes a larger bit shank bore and an enlarged upper shank segment or band with a taper of up to 7 degrees per side that provides an interference fit between the top of the shank and top of the bit block bore when the bottom of the bit holder body seats on the top of the bit block bore. An annular tapered void adjacent the bit holder tire portion provides for ease of bit holder extraction.