Rotatable Tool Handle With Axis-Aligned Engaging Points
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Solution Overview
Problem
Conventional rotatable screwdriver handles are structurally complex and difficult to assemble, with weak structural strength due to a single engaging member and cavities that can break under significant force, limiting their ability to securely switch between in-line and angled positions.
Innovation Solution
A rotatable tool handle design featuring a first and second part with enhanced structural strength, where the engaging points lie on the rotation axis, with harder recess and pivot portions, and a control mechanism using a pin, elastic member, and engaging cavities to securely switch between in-line and angled positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single engaging member and cavity structure is used to connect the upper and lower parts, then the device complexity is reduced, but the structural strength becomes weak and the engaging structure is likely to break under large force
Solution Approach 1:
The patent combines multiple engaging members (first engaging member in first cavity, second engaging member in second cavity) to work together with the pivot portion, creating a multi-point engagement system that distributes mechanical stress and significantly enhances the overall structural strength of the connection between upper and lower parts
Solution Approach 2:
The patent creates local hardening at the engaging points by forming cavities with reinforced walls and using material with higher hardness at the pivot portion and engaging member contact surfaces, while the rest of the handle body maintains normal material properties, thus strengthening critical areas without increasing overall complexity
2Reliability
If multiple engaging members and cavities are used to enhance structural strength, then the reliability is improved, but the ease of manufacture deteriorates due to increased assembly difficulty
Solution Approach 1:
The patent divides the engagement system into modular components: the pivot portion with integrated cavities, the engaging members that can be pre-assembled, and the control mechanism, allowing each component to be manufactured and tested separately before final assembly, thereby maintaining ease of manufacture while achieving high reliability
Solution Approach 2:
The patent introduces a control member as an intermediary that automatically controls the engagement and disengagement of the engaging members through a single user action, simplifying the assembly process and making the multi-component system easy to operate and manufacture
3Ease of operation
If the engaging points are positioned away from the rotation axis, then the ease of operation is improved, but the stability of the composition deteriorates as the engaging structure becomes weaker during rotation
Solution Approach 1:
The patent positions the pivot portion and engaging members asymmetrically relative to the rotation axis, with the engaging points strategically located to provide both lever arm for easy operation and sufficient radial support for stability, creating an optimized geometric configuration that balances operational ease with structural stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design provides improved structural strength and ease of assembly, allowing secure switching between positions without breaking under force, enhancing the handle's durability and usability.
Implementation Method 1
An elastic member is disposed between the engaging member and the first engaging cavity in such a manner that the engaging member is pushed against the drive end of the pin by the elastic member
Data Source
AI summary
A rotatable tool handle comprises a first part and a second part which can be switched between an in-line position and an angle position. Further, the locking structure for fixing the first and second parts is disposed between the connecting structures of the first and second parts, so that the engaging points of the first and second parts lie on the rotation axis of the two parts. Moreover, the portion of the first part for forming the recess is harder than the rest of the first part, and the portion of the second part for forming the pivot portion is harder than the rest of the second part, so as to enhance the structural strength of the engaging structure of the first and second parts of the handle.