Power Tool Shaft Locking Assembly for One-Step Bit Changes
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Solution Overview
Problem
Handheld power tools require frequent accessory replacements, which can be cumbersome due to the need for one-handed operation of shaft locking components, making the process inconvenient and unsafe.
Innovation Solution
A power tool design featuring a shaft locking assembly with multiple locking portions and an execution portion that can be easily switched between locked and unlocked states using a single operation, allowing for safe and efficient tool bit replacement without continuous one-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional shaft locking assembly is used, then the tool bit can be securely locked, but the replacement process requires continuous one-handed operation which is inconvenient and unsafe
Solution Approach 1:
The shaft locking assembly automatically locks the drive shaft when the accessory is installed, eliminating the need for continuous manual operation. The locking portions are pre-positioned to engage with the drive shaft, and the execution portion automatically moves to the locked position upon accessory installation, ensuring both convenience and reliability.
Solution Approach 2:
The shaft locking assembly is designed to automatically lock and unlock the drive shaft without requiring continuous user intervention. The locking mechanism self-activates when the accessory is installed or removed, allowing the system to serve itself rather than requiring constant manual operation.
2Adaptability or versatility
If frequent accessory replacements are required, then the power tool can adapt to different machining needs, but the operation becomes cumbersome and time-consuming
Solution Approach 1:
The shaft locking assembly prepares the locking portions in advance at predetermined positions around the drive shaft. When an accessory is installed, the locking mechanism is already positioned to immediately engage, eliminating the need for time-consuming manual locking operations during each accessory change.
Solution Approach 2:
The shaft locking assembly transitions from a static locking mechanism to a dynamic one that automatically adjusts its locking state based on accessory installation. The execution portion moves dynamically between locked and unlocked states, enabling rapid accessory replacement while maintaining secure locking when needed.
3Ease of operation
If the shaft locking assembly requires one-handed operation, then the locking function can be performed, but user safety is compromised during accessory replacement
Solution Approach 1:
The shaft locking assembly performs the locking and unlocking functions automatically without requiring user hand operation. The mechanism self-activates when the accessory is installed or removed, completely eliminating the safety risk associated with one-handed operation while maintaining full locking functionality.
Solution Approach 2:
The locking portions are pre-positioned around the drive shaft at predetermined locations. When the accessory is installed, the execution portion automatically engages with these pre-positioned locking portions, eliminating the need for manual intervention and thereby removing the safety hazard of one-handed operation.
Data Source
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AI summary
A power tool includes a shaft locking assembly (121) and an electric motor (11). The shaft locking assembly includes a first state where a chuck (131) is restrained from rotating and a second state where the chuck is released to rotate. The shaft locking assembly includes multiple locking portions (2112) and an execution portion (2114). The multiple locking portions are formed on or connected to a drive shaft (111) or the chuck. The execution portion is optionally engaged with at least one locking portion. When the execution portion moves to a first position, the execution portion is engaged with the at least one locking portion such that the shaft locking assembly is in the first state. The electric motor includes a stop state where the first position is in the at least one locking portion when the electric motor stops.