Handled Tool Asymmetric Driving Portion Connection Stability
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Solution Overview
Problem
Existing hand tools experience loose connections between the driving portion and the handle over time due to sliding issues, leading to reduced functionality and shortened tool lifespan.
Innovation Solution
A hand tool design featuring a driving portion with an enlarged annular portion, a coarse section, and an extending unit with a rectangular cross section, which securely attaches to a handle portion with an enclosing cover, preventing sliding and ensuring a firm connection through a combination of the annular portion resisting the enclosing cover's upper edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a round-shaped driving portion is used in the handle, then the manufacturing process is simple, but the driving portion easily slides with respect to the handle over time
Solution Approach 1:
The patent applies asymmetry by changing the driving portion shape from a simple round form to a non-circular shape with specific geometric features (flat surfaces, angled surfaces, or protrusions). This asymmetric design prevents the driving portion from sliding within the handle by creating a unique fit that resists rotational and linear displacement, thereby improving connection stability while maintaining manufacturing feasibility through standardized molding techniques.
2Ease of operation
If the driving portion is driven to rotate during operation, then the tool functions properly, but the connection between driving portion and handle becomes loose after prolonged use
Solution Approach 1:
The patent applies dynamics by designing a connection structure that allows controlled rotation while preventing excessive movement. The driving portion incorporates features such as flat surfaces or angled surfaces that engage with corresponding features in the handle, enabling rotational motion during operation while maintaining a secure connection that prevents loosening over time through proper geometric interlocking.
Solution Approach 2:
The patent uses asymmetry by creating a non-circular driving portion shape with specific geometric features (flat surfaces, angled surfaces, or protrusions) that prevent sliding and reduce rotational play. This asymmetric design maintains operational functionality while improving connection stability during prolonged use.
3Reliability
If the driving portion and handle are molded together as one piece, then the connection is secure, but the design lacks adaptability for different applications
Solution Approach 1:
The patent applies segmentation by dividing the tool into separate components (driving portion and handle) that are then precisely fitted together through asymmetric geometric features. This segmentation allows for improved adaptability and versatility in different applications while maintaining a secure connection through the interlocking design of the driving portion and handle features.
Data Source
AI summary
A handled tool with a firm structure comprises a driving portion having a driving end and a connecting end; the driving end being an operation end of the handled tool; an enlarged annular portion being below the driving end; a coarse section being between the annular portion and the connecting end; an extending unit being a rod; the extending unit having a first extending end and a second extending end; the first extending end being combined to the embedding groove of the driving portion; and a handle portion having a enclosing cover and a handle, in assembly, the first extending end of the extending unit being combined to the connecting end; the second extending end of the extending unit being received in the handle portion; the enclosing cover enclosing a portion of the extending unit protruded from the handle portion and a portion of the driving portion.