Ferromagnetic Protective Ring for Watch Movement Magnetic and Shock Protection
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Solution Overview
Problem
Existing watch movements are not adequately protected from magnetic fields and mechanical shocks, particularly from impacts caused by the oscillating weight during angular displacement, and existing solutions are bulky and complicate manufacturing.
Innovation Solution
A tubular-shaped antimagnetic and shockproof protection circle made of ferromagnetic material is fixed to the watch movement, limiting angular displacement of the oscillating weight and channeling magnetic fields, with fixing members ensuring secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ferromagnetic box is used to protect the watch movement from magnetic fields, then magnetic field protection is improved, but the watch becomes bulky and its mass increases
Solution Approach 1:
The invention extracts the magnetic shielding function from a bulky ferromagnetic box and concentrates it into a small protective ring made of ferromagnetic material positioned around the oscillating weight, providing the same protection with minimal mass addition
Solution Approach 2:
The solution transitions from a three-dimensional box enclosing the entire movement to a one-dimensional ring structure positioned strategically around the oscillating weight, reducing the volume and mass required for magnetic protection
2Object-affected harmful factors
If a ferromagnetic box is used to protect the watch movement from magnetic fields, then magnetic field protection is improved, but manufacturing complexity increases
Solution Approach 1:
The protective structure is segmented into a simple ring shape that can be independently manufactured and then installed, separating the magnetic shielding function from the complex assembly of a complete box structure
Solution Approach 2:
The protective ring functions as a thin ferromagnetic barrier that provides effective magnetic shielding without requiring the thick walls and complex structure of a full box, simplifying both design and manufacturing
3Object-affected harmful factors
If elastic supports are used to protect the watch movement from mechanical shocks, then shock protection is improved, but the watch becomes bulky and manufacturing is complicated
Solution Approach 1:
The invention merges the shock protection function with the existing protective ring structure, allowing the same component to provide both magnetic field shielding and mechanical shock protection, thereby avoiding additional bulky elements
Solution Approach 2:
The protective ring serves multiple functions simultaneously: it acts as a magnetic shield, a mechanical stop, and a shock-absorbing element, eliminating the need for separate dedicated components for each protection type
4Reliability
If the oscillating weight is allowed to displace angularly during impact, then the watch movement is vulnerable, but constraining it reduces the protective ring dimensions
Solution Approach 1:
The protective ring is designed with specific dimensional parameters (thickness, radius, material properties) that allow it to effectively limit angular displacement of the oscillating weight while maintaining a compact size that minimizes impact on the watch overall dimensions
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 solution effectively protects the watch movement from magnetic fields and mechanical shocks while maintaining a compact design, minimizing visible impacts and facilitating easy assembly.
Implementation Method 1
The circle is made of a material having ferromagnetic properties and is adapted to constitute, by its first axial end, a stop limiting the angular displacement
Data Source
Figure 1~3
AI summary
The invention relates to an anti-magnetic and anti-shock protective ring (10) for a watch movement (20), intended to be fixed to a watch movement (20), said ring (10) comprising a tubular body extending between a first and a second axial end (11, 12) and being characterized in that it is made of a material having ferromagnetic properties and in that it is adapted to constitute, by the first axial end (11), a stop limiting the angular displacement around a radial axis of an oscillating mass (23) connected to the watch movement (20).