Cutting Device Handle Support Rigidity via Fixed Cover Attachment
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Solution Overview
Problem
Existing cutting devices, such as circular saws, often have insufficient support rigidity in their handle support portions, leading to potential bending and reduced user control, especially when the handle extends rearward from the fixed cover.
Innovation Solution
A cutting device design where the handle is affixed to the fixed cover at a position proximal to the grip, ensuring sufficient support rigidity without relying on the electric motor's alignment, allowing for a less expensive reduction gear train and a more compact, cost-effective manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the handle extends rearward from a position proximal to the rotary blade (near the front of the fixed cover), then the handle support rigidity is improved, but the device complexity increases due to the need for precise positioning and attachment mechanisms
Solution Approach 1:
The patent merges the handle attachment function with the fixed cover structure by providing attachment portions integrated into the fixed cover. The handle is attached at multiple positions (front, middle, and rear) to the fixed cover, combining the support function with the existing cover structure rather than requiring a separate attachment mechanism.
Solution Approach 2:
The patent segments the handle attachment into multiple discrete attachment portions located at different positions along the fixed cover. This segmentation allows the handle to be supported at multiple points, distributing the load and improving rigidity while keeping each individual attachment simple.
2Ease of operation
If the handle extends rearward by a relatively large distance from the rear half of the fixed cover, then the ease of operation is improved for standing cutting operations, but the handle support rigidity deteriorates due to the increased leverage and bending moments
Solution Approach 1:
The patent adds the vertical dimension to handle support by providing multiple attachment portions at different heights and positions on the fixed cover. This multi-dimensional attachment strategy allows the handle to extend rearward for ergonomic operation while maintaining rigidity through distributed support points in three-dimensional space.
3Ease of manufacture
If the electric motor is arranged with its motor shaft extending parallel to the cutting plane of the rotary blade, then the manufacturing cost is reduced by using simpler gear trains, but the handle support rigidity deteriorates due to the motor housing occupying space near the handle attachment area
Solution Approach 1:
The patent applies local quality by providing reinforced attachment portions at specific locations on the fixed cover where the handle connects. These localized reinforcement areas compensate for the reduced overall rigidity caused by the motor arrangement, ensuring sufficient handle support strength only where needed without requiring a completely different motor configuration.
Data Source
AI summary
A cutting device may include a main body supported on the upper side of a base. The main body includes a rotary blade and a fixed cover partially covering the rotary blade. A handle is attached to the fixed cover and extends rearward therefrom.