Hand-Held Tool Output Shaft with Nested Thread Standards
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Solution Overview
Problem
Existing hand-held grinding or disc cutting tools are limited by compatibility with specific accessory standards, requiring multiple tools for different standards, which is costly and cumbersome.
Innovation Solution
A hand-held tool with an output shaft capable of rotating both accessories with threaded central openings and those with smooth central openings, using adaptable means such as external threads, shoulders, and flanges to securely connect various accessories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the output shaft is designed with a specific thread standard, then the connection strength with the accessory is improved, but the adaptability to different accessory standards deteriorates
Solution Approach 1:
The output shaft is designed with multiple thread standards (e.g., M14, M16, M18) directly integrated into its structure, allowing a single shaft to universally connect with accessories of different standards. This multi-functional design eliminates the need for separate output shafts for each standard while maintaining strong connections for each specific accessory type.
Solution Approach 2:
Different thread standards are nested or integrated into the output shaft structure, where multiple thread types can coexist on the same shaft. This nesting approach allows the shaft to accommodate various accessory standards without requiring multiple separate components, thus improving both connection strength and adaptability.
2Adaptability or versatility
If multiple output shafts are provided for different standards, then the adaptability to different accessory standards is improved, but the device complexity increases
Solution Approach 1:
Instead of providing multiple separate output shafts, the invention integrates multiple thread standards into a single universal output shaft. This reduces device complexity by eliminating redundant components while maintaining adaptability to different accessory standards through the multi-standard thread design.
Solution Approach 2:
Multiple thread standards that would traditionally require separate output shafts are merged into a single integrated shaft structure. This combining approach simplifies the overall device by reducing the number of replaceable parts while preserving the ability to connect with various accessory types.
3Adaptability or versatility
If multiple tools are purchased for different standards, then the adaptability to different accessory standards is improved, but the cost increases
Solution Approach 1:
The output shaft with multiple thread standards enables a single tool to perform multiple functions by accommodating different accessory standards. This eliminates the need to purchase and maintain multiple separate tools, thereby reducing the total quantity of tools required while maintaining full adaptability to various accessory types.
Data Source
AI summary
A grinding or disc cutting-type hand-held tool including: a casing housing a motor and an output shaft rotated by the motor along an axis of rotation. The output shaft is capable of rotating: a first type of accessory having a threaded central opening; and a second type of accessory having a smooth central opening. The output shaft has: an end portion supporting a first connection element for rigidly connecting the first type of accessory; and an intermediate portion supporting a second connection element for rigidly connecting the second type of accessory.