Tyre Removal Tool With Deformable Hook For Bead Extraction
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Solution Overview
Problem
Existing tyre removing machines face challenges in reducing the risk of damaging tyres and wheel rims during the removal process, while also being complex and costly, with previous solutions either requiring significant user skill or having high mechanical stress on the tyre bead.
Innovation Solution
A tyre removal tool with a fingernail-shaped member that can deform between a hooked and tapered configuration, connected to an arm via a biasing mechanism, allowing for automatic adjustment to reduce mechanical stress and prevent damage, while maintaining simplicity and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hook-shaped tool is used to grasp the tyre bead, then the bead can be effectively extracted from the rim, but the risk of damaging the tyre bead and wheel rim increases during insertion
Solution Approach 1:
The tool employs a movable finger element that can dynamically change its configuration between a retracted state (reducing damage risk during insertion) and a protruding hooked state (enhancing bead grasping capability). This dynamic transformation allows the tool to adapt its shape according to the operational phase, resolving the contradiction between effective bead extraction and damage prevention.
Solution Approach 2:
The tool changes its geometric parameters by extending or retracting the finger element. When the finger is retracted, the tool presents a smaller profile that reduces the risk of damaging the rim and bead during insertion. When the finger protrudes, it forms a hook shape that effectively grasps the bead for extraction. This parameter change enables the tool to optimize its performance for different operational requirements.
2Ease of operation
If an automatic actuator system is implemented to control tool movement and reduce user effort, then operator skill requirements decrease, but the machine complexity and cost increase
Solution Approach 1:
The tool utilizes the mechanical energy from the arm's movement to automatically trigger the finger's extension and retraction through a biasing mechanism. The system serves itself by converting the existing mechanical motion into the required finger positioning without requiring separate control actuators. This self-service approach maintains ease of operation while avoiding the complexity and cost of additional automated control systems.
Solution Approach 2:
The biasing mechanism provides automatic dynamic adjustment of the finger position based on the arm's movement state. As the arm moves, the biasing mechanism automatically extends or retracts the finger without requiring external control signals or complex actuation systems. This dynamic self-adjustment reduces user skill requirements while keeping the machine simple.
3Device complexity
If the tool is made rigidly connected to the arm, then the structure is simple, but the ability to reduce mechanical stress on the extracted bead is limited
Solution Approach 1:
The tool employs a pivoting connection between the arm and the tool body, allowing the tool to dynamically adjust its orientation relative to the arm. This dynamic connection enables the tool to automatically position the extracted bead in a stress-reducing configuration while maintaining a simple mechanical structure without rigid fixed mounting.
Solution Approach 2:
The tool is divided into separable components: the main tool body connected to the arm, and the movable finger element. This segmentation allows each component to perform its specific function independently - the tool body provides structural support while the finger element provides adaptive bead engagement and stress reduction capability, achieving both simplicity and reliability.
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 tool effectively reduces the risk of damaging tyres and wheel rims by automatically adjusting its shape to grasp the bead without requiring complex user operation, simplifying the process and reducing mechanical stress, thus enhancing the efficiency and safety of tyre removal.
Implementation Method 1
biasing means (which comprises a spring) acting on the removal tool to force it to move to the first operating position when no external forces are applied to the tool
Data Source
Figure 1
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Figure 4~5
AI summary
A removal tool (10) for a tyre removing machine (1), for taking off a tyre (7) from a respective wheel rim (6), comprises an elongate body (12) having a first end (12a) which is connectable to a supporting arm (3) and a second, hook-shaped end (12b) for grasping a bead (14) of the tyre (7); the second end (12b) of the tool (10) has a fingernail shaped member (13) which is movable from a first operating configuration, where it projects in cantilever fashion from the body (12) to define the hooked shape, to a second operating configuration, where it is tucked in a lateral zone of the body (12), to give the tool (10) a hookless shape, and vice versa.