Splined Bushing Adapter Board for Tool Bit Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing blade assemblies with serrated cutting edges face challenges in removing tool bits due to deformation caused by significant loads, leading to difficult and costly replacements, as the tool bits often become seized in the bit shank hole or require damaging methods to remove.
Innovation Solution
A blade assembly design featuring a splined bushing and tool bit with a splined shank portion, allowing for easier removal by mating the splines of the tool bit with the bushing's splines, and using a snap ring for secure attachment, facilitating tool bit detachment without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a press fit or catch point is created by deforming the adapter board and/or tool bit to secure the tool bit, then the tool bit attachment strength is improved, but the ease of removal deteriorates as pressing or damaging methods are required
Solution Approach 1:
The interface is segmented into multiple splines distributed around the circumference, allowing the tool bit to be inserted and removed by breaking the bond at multiple discrete locations rather than requiring forceful extraction through a single deformation point
Solution Approach 2:
Instead of creating a permanent deformed fit that requires reverse deformation for removal, the splines create a reversible mechanical interlock that can be easily disengaged by applying force to the handle end, inverting the traditional press-fit approach
2Power
If significant loads are applied to the tool bit and adapter board during operation, then the cutting performance is improved, but the ease of removal deteriorates as the tool bit becomes seized in the bit shank hole
Solution Approach 1:
The splined interface allows the connection to dynamically adapt to operational loads while maintaining a controlled friction fit that can be easily broken for removal, preventing permanent seizing unlike conventional press fits
Solution Approach 2:
The splines act as an intermediary mechanism between the tool bit and adapter board, providing a controlled friction fit that allows easy removal even after significant operational loads, preventing direct metal-to-metal seizing
Data Source
AI summary
A blade assembly includes an adapter board including a lower tool bit attachment portion, terminating in a lower adapter board free end, the lower adapter board free end defining a bottom surface defining a plurality of shank receiving bores. A plurality of bushings are disposed in a corresponding one of the plurality of shank receiving bores.