Electric Power Tool Cover Masking Mechanism
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Solution Overview
Problem
Existing electric power tools do not effectively prevent users from removing the cover, which is essential for safety, as current configurations allow for easy disengagement of the cover, potentially leading to unsafe usage.
Innovation Solution
Incorporating a mask member with a shape that blocks visibility of the engaging portion between the cover and the housing, and a stopper member that can be screwed to the housing, preventing rotation in the direction of removal, thus preventing the user from disengaging the cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cover is designed to be easily removable, then the ease of operation is improved, but the safety is worsened due to potential accidental removal
Solution Approach 1:
The patent introduces an intermediary mechanism (the engaging portion with protrusion and corresponding recess, combined with the mask member) that mediates between the cover and housing. This intermediary structure enables controlled engagement where the cover can be deliberately attached and detached through specific actions, while preventing accidental removal through the mask member's blocking action. The intermediary mechanism resolves the contradiction by providing both ease of deliberate operation and reliability against accidental detachment.
2Reliability
If a prevention mechanism is added to stop cover removal, then the safety is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by concentrating the prevention function into a specific localized structure (the mask member with its blocking shape) rather than making the entire attachment mechanism complex. The mask member is a simple, localized component that specifically blocks the engaging portion from being fully disengaged, providing the prevention function with minimal added complexity. This localized approach allows the rest of the cover attachment system to remain simple while achieving the safety goal.
3Ease of operation
If the engaging portion is visible, then the ease of operation is improved, but the safety is worsened as users can deliberately disengage the cover
Solution Approach 1:
The mask member serves as an intermediary element positioned between the user's view and the engaging portion. It blocks the visual access to the engaging portion while still allowing the cover to be attached through the mask member itself. This intermediary structure creates a situation where the engaging portion remains functionally accessible for deliberate attachment, but is visually obscured to prevent deliberate disengagement attempts. The mask member mediates between these conflicting requirements.
Data Source
AI summary
An electric power tool disclosed herein may include a motor; a power transmission mechanism connected to the motor; a housing that houses the motor and the power transmission mechanism; a tool holder projecting from the housing; a cover covering at least a part of a tool attached to the tool holder; and a mask member. The cover may include an engaging portion that engages with the housing. The mask member may have a shape that blocks visibility of at least a part of the engaging portion.