Bendable Wrench Pivot Mechanism for Continuous Angle Adjustment
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Solution Overview
Problem
Conventional bendable wrenches have complex structures, require inconvenient two-handed operation to change the angle between the head and handle, can only be adjusted between limited pre-determined values, and fail to firmly retain the angle, posing operational interruptions and safety risks.
Innovation Solution
A structurally simple design featuring a handle with ears and internal teeth, a pivot with matching teeth, a spring, and a button that allows easy adjustment and firm retention of the angle between the head and handle by engaging and disengaging the teeth, enabling a wide range of angular positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional connecting devices are used to connect head to handle, then the angle can be changed between pre-determined values, but the structure becomes complicated and the angle cannot be changed continuously
Solution Approach 1:
The connecting device is segmented into a handle with internal teeth, a pivot with external teeth, and a button mechanism. This segmentation allows the pivot to engage with different teeth positions on the handle, enabling continuous angle adjustment while keeping each component relatively simple in structure.
Solution Approach 2:
The connecting device transitions from a static fixed-angle structure to a dynamic adjustable-angle structure. The pivot can rotate freely to change the angle between head and handle, and the button mechanism enables dynamic engagement/disengagement of teeth to lock or release the angle as needed.
2Reliability
If conventional connecting devices are used, then the angle can be retained at pre-determined values, but the operation becomes inconvenient requiring two-handed operation
Solution Approach 1:
The button mechanism allows the user to engage or disengage the teeth with a simple pushing motion, and the spring automatically maintains the engaged state. This self-service mechanism eliminates the need for complex two-handed operation while ensuring reliable angle retention through the spring-loaded tooth engagement.
3Reliability
If conventional connecting devices are used, then the structure is complete, but the assembly and manufacturing become troublesome
Solution Approach 1:
The connecting device merges multiple functions into a compact structure: the pivot serves as both the rotation axis and the toothed engagement component, the button combines the release mechanism with the spring activation, and the spring provides both engagement force and retention. This merging reduces the number of separate components and simplifies assembly while maintaining reliable angle retention.
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
Enables easy and secure adjustment of the angle between the head and handle within a large range, improving operational convenience and safety by simplifying assembly and eliminating the need for complex components and pre-determined settings.
Implementation Method 1
The connecting device includes a spring and a button. The button has an internal thread engaged with the thread on the pivot. The spring is engaged with the button and the teeth of the head
Data Source
AI summary
A bendable wrench includes a handle, a head and a pivot. The handle includes a first ear formed thereon, a second ear formed thereon and a plurality of teeth formed on an internal side of the second ear. The head includes an ear and a plurality of teeth formed on an internal side of the ear thereof. The pivot is movably inserted in the ears so as to pivotally connect the head to the handle. The pivot includes a plurality of teeth that can be engaged with the teeth so as to firmly retain the angle between the head and the handle and disengage from the teeth of the head so that the angle between the head and the handle can be changed.