Split Ring Fastening for Watch Display Tolerance Compensation
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Solution Overview
Problem
The manufacturing process of display elements and movements in watches often results in tolerances that require precise adjustments for assembly, leading to discarded parts due to incompatibility.
Innovation Solution
A split ring fastening device is used to adapt and securely attach display elements to watch movements, accommodating manufacturing tolerances through deformable portions and a circular arc or clip design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid fastening methods are used to assemble display elements to movements, then assembly precision is improved, but manufacturing tolerances cause parts to be discarded
Solution Approach 1:
The fastening element changes its physical state from a deformable condition during assembly to a rigid condition during operation. The element is introduced in a deformable state to accommodate tolerance variations, then fixed in its deformed state to provide rigid fastening, thus resolving the contradiction between accommodating tolerances and providing precise assembly.
Solution Approach 2:
The fastening element transitions from a dynamic, adaptable state during assembly to a static, fixed state during operation. This allows the element to adapt to dimensional variations of the components being joined, then maintain a stable, precise connection once assembled.
2Adaptability or versatility
If adjustable fastening mechanisms are used to accommodate tolerances, then part compatibility is improved, but device complexity increases
Solution Approach 1:
The fastening mechanism is divided into two functional segments: a deformable element for accommodating tolerances and a rigid structure for providing stable fastening. This segmentation allows each part to perform its specific function optimally without requiring a complex adjustable mechanism.
Solution Approach 2:
The deformable fastening element acts as an intermediary between components with tolerance variations. It absorbs the dimensional discrepancies through controlled deformation, allowing rigid components to be joined without requiring complex adjustment mechanisms.
3Adaptability or versatility
If deformable fastening elements are used to adapt to display elements, then assembly flexibility is improved, but fastening strength may be reduced
Solution Approach 1:
The fastening element exhibits dynamic behavior during assembly, deforming to accommodate dimensional variations. Once assembled, it transitions to a static, rigid state that provides strong, stable fastening. This temporal separation of deformability and rigidity resolves the contradiction between adaptability and strength.
Solution Approach 2:
The deformation of the fastening element is performed preliminarily during the assembly process. Once the element is deformed to accommodate the components, it is fixed in this state before final assembly, ensuring that the deformation does not compromise the subsequent fastening strength.
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 split ring effectively compensates for manufacturing tolerances, allowing for accurate assembly and reducing part discard rates by providing a flexible and precise fastening solution.
Implementation Method 1
said split ring being configured to be deformed and to adapt to said at least one display element
Data Source
AI summary
A fastening method is for fastening at least one display element of a watch using a fastening device. Indeed, the at least one display element is fastened thanks to the fastening method via the fastening device. For this, it is necessary to provide the at least one display element, at least one movement, and at least one split ring, then to deform the at least one split ring so as to adapt to the at least one display element before fastening the at least one split ring with the at least one display element to the at least one movement.