Oscillating Winding Weight with Decorative Element
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Solution Overview
Problem
Automatic-movement timepieces with transparent backs face aesthetic challenges due to the obstructive oscillating winding weight, which diminishes the observation of the movement, even in skeleton watches, as existing transparent oscillating weights lack visual appeal when at rest.
Innovation Solution
An oscillating winding weight with a decorative element, featuring a heavy part and a main element made of different materials with varying densities, allowing the decorative element to be positioned attractively when the weight is at rest, using materials like tungsten or metal alloys for the heavy part and transparent materials like sapphire or plastic for the main element, with a weighting member to orient the decorative element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a transparent oscillating winding weight is used to allow movement observation, then the visibility of the movement is improved, but the aesthetic appearance when at rest deteriorates
Solution Approach 1:
The winding weight combines a transparent main element for visibility with a decorative element made of a different material (metal, ceramic, or crystal) that provides aesthetic appeal when the watch is at rest. The decorative element is integrated into the transparent structure, allowing both functions to coexist: the transparent portion allows movement observation while the decorative element provides visual charm in the resting position.
2Shape
If a decorative element is added to the winding weight to improve aesthetic appearance, then the visual appeal is improved, but the weight distribution and oscillation performance may deteriorate
Solution Approach 1:
The patent specifies that the decorative element is made of a material with a density between 2 and 10 g/cm³, which is carefully selected to balance aesthetic requirements with functional performance. This density parameter ensures the decorative element contributes to the overall weight distribution without compromising the oscillation characteristics of the winding weight.
Solution Approach 2:
The winding weight is constructed as a composite structure combining a transparent main element (acrylic, polycarbonate, or sapphire with density 1.1-4.0 g/cm³) and a decorative element (metal, ceramic, or crystal with density 2-10 g/cm³). This composite construction allows optimization of both aesthetic appearance and weight distribution by selecting materials with appropriate density ratios.
3Speed
If the decorative element is made of a lighter material to maintain oscillation performance, then the oscillation characteristics are maintained, but the aesthetic appeal and visual weight deteriorate
Solution Approach 1:
The patent defines a specific density range (2-10 g/cm³) for the decorative element material that balances oscillation performance with aesthetic appeal. This parameter optimization ensures the decorative element is sufficiently dense to provide visual weight and appeal while not being so dense as to compromise the oscillation characteristics of the winding weight.
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
Enhances the aesthetic appeal of the timepiece by positioning the decorative element, such as a logo or initials, in a specific direction when the winding weight is at rest, providing an aesthetically pleasing view through the transparent back without obstructing the movement observation.
Implementation Method 1
the heavy part comprising a third material having a higher density than the second material, such that the heavy part is heavier than the decorative element in order to position it in a predefined position
Data Source
AI summary
An oscillating winding weight of a movement of a timepiece is mounted such that it rotates on an arbor of the movement. The oscillating winding weight comprises a main element conferring the overall shape of the oscillating winding weight, a heavy part allowing the weight to oscillate in response to the movement of the timepiece and the force of gravity, and a decorative element. The decorative element is a logo or initials and attached to the main element. The main element comprises a first material, the decorative element comprises a second material, and the heavy part comprises a third material. The third material has a higher density than the second material, such that the heavy part is heavier than the decorative element in order to position the decorative element in a predefined position.