Watch Bezel Extraction Tool with Bell Clamp and Thrust Unit
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Solution Overview
Problem
Current watch bezel extraction tools often damage the bezel or middle part due to improper handling and lack of precise axial release, with high costs and complexity associated with existing precision mechanical assemblies.
Innovation Solution
A tool featuring a bell clamp with a split clamp design and variable geometry, combined with a holding body and expansion/retraction mechanism, ensures axial release and integrity of the bezel, using interchangeable bell clamps made of lightweight materials for easy and precise operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional steel tools with concentric clamping are used, then manufacturing precision and reliability are improved, but device complexity and acquisition cost increase
Solution Approach 1:
The tool is divided into modular components: interchangeable bell clamps with specific geometries for different bezel sizes, a standardized holding body, and an expansion mechanism. This segmentation allows simple base tools combined with specialized inserts rather than completely complex precision assemblies
Solution Approach 2:
The holding body and expansion mechanism serve universal functions across different bezel sizes, while only the bell clamp inserts need to be interchangeable. This multi-functionality reduces overall device complexity compared to entirely specialized tools for each bezel type
2Manufacturing precision
If specialized jaw sets are used for different glass sizes, then manufacturing precision is improved, but acquisition cost and operating cost increase
Solution Approach 1:
The system separates the expensive precision components (bell clamp inserts with specific geometries) from the reusable holding body. Only the relatively simple inserts need to be interchangeable and sized-specific, while the main tool structure remains standardized and reusable across applications
Solution Approach 2:
Multiple bell clamp inserts with different geometries are created as simple copies that fit the same holding body. These inserts are relatively simple to manufacture compared to entirely specialized tools, reducing acquisition costs while maintaining precision for different bezel sizes
3Force
If wedge tools with helically cut cleats are used, then extraction force is improved, but radial and axial thrust components increase causing bezel damage
Solution Approach 1:
The bell clamp inserts have specifically engineered contact surfaces with optimized geometries (conical, cylindrical, or spherical) that distribute extraction force uniformly across the bezel perimeter. This local optimization at the contact points eliminates the radial and axial thrust components that cause damage with wedge tools
Solution Approach 2:
The contact geometry parameters of the bell clamp inserts are specifically designed to change the force distribution characteristics. By using curved surfaces (conical, cylindrical, or spherical) instead of flat wedge surfaces, the force is distributed evenly, eliminating harmful thrust components while maintaining extraction effectiveness
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 allows for safe, precise, and cost-effective extraction of watch bezels without damaging the components, with interchangeable clamps and lightweight materials ensuring ease of use and low operational costs.
Implementation Method 1
a mechanism 17 for expanding or retracting a bell clamp 15
Implementation Method 2
a conical outer profile, arranged to cooperate with a conical internal profile which comprises a bell
Data Source
Figure 1~5
Figure 6~14
AI summary
The tool has a holding body (16) arranged to connect with an expansion or retraction mechanism (17) for maneuvering a bell-chuck (15), where the bell-chuck is arranged to rest on a periphery of a bezel (20) mounted on a middle part (22) of a watch (23). A thrust unit (30) is coaxially mounted at an inner side of the bell-chuck and arranged to rest on a crystal (21) driven into the middle part in order to exert a sufficient thrust force on the crystal to cause a relative displacement of the bell-chuck with respect to the crystal.