Elastic Split Ring Bolt for Watch Sub-Assembly Angular Indexing
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Solution Overview
Problem
Existing external parts of watches and jewelry face challenges in achieving angular indexing while maintaining water-resistance and preventing unintentional disassembly, which is difficult to achieve with conventional fastening methods that can weaken materials like ceramics and sapphire.
Innovation Solution
A sub-assembly of external parts using an elastic split ring bolt with a removable insert and complementary grooves and collars that secure and index components axially, allowing for easy angular adjustment and secure assembly without external fasteners or machining, suitable for diverse materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fastening methods are used to secure external parts, then the assembly is secure, but the materials like ceramics and sapphire are weakened
Solution Approach 1:
The fastening function is segmented into two independent parts: the elastic split ring provides mechanical securing while the removable insert provides the indexing feature. This separation allows each component to be optimized for its specific function without compromising the other, and the insert can be removed without damaging the brittle external part.
Solution Approach 2:
The removable insert acts as an intermediary element between the elastic split ring and the external part. It transfers the indexing function from the main fastening structure to a separate component that can be easily removed and repositioned, preventing direct contact between fastening elements and fragile materials.
2Reliability
If conventional fastening methods are used to prevent disassembly, then the assembly is secure, but angular indexing becomes difficult to achieve
Solution Approach 1:
The system transitions from a static fastening arrangement to a dynamic one where the removable insert can be easily taken out and repositioned to different angular positions. This dynamic capability allows for simple angular indexing while the elastic split ring maintains continuous securing pressure.
Solution Approach 2:
The elastic split ring is pre-formed with a specific geometry that allows it to be compressed and expanded. This preliminary preparation enables the ring to be installed without threading or complex fastening operations, and the removable insert can be independently positioned before final assembly.
3Reliability
If external fasteners are used to secure components, then the assembly is secure, but the device complexity increases
Solution Approach 1:
The elastic split ring combines multiple functions into a single component: it provides radial securing pressure, axial positioning through its compressed state, and accommodates the removable insert for indexing. This merging eliminates the need for separate screws, nuts, and indexing mechanisms.
Solution Approach 2:
The elastic split ring serves multiple purposes simultaneously: it acts as a retaining ring, a spring element for continuous pressure, a mounting structure for the removable insert, and provides shock absorption. This multi-functionality reduces the overall number of components needed in the assembly.
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
Ensures water-resistant and secure assembly with easy angular indexing, preventing accidental unscrewing and allowing for component interchangeability, suitable for both high-end and mass-produced items made from various materials, including fragile or hard materials.
Implementation Method 1
an elastic split ring bolt (3), mounted coaxially with a first component (1) and a second component (2), which together compress a sealing and friction joint (9)
Implementation Method 2
which together compress a sealing and friction joint (9)
Data Source
AI summary
A sub-assembly of external parts including, coaxially with a first component and a second component compressing together a sealing and friction joint, and interposed therebetween, a bolt securing them together by axially blocking the first component, and a lower surface of which lies, in the assembled position, in the vicinity of an upper surface of the second component, which bolt includes a lower relief protruding axially from this lower surface towards the second component, arranged to either complementarily cooperate with an oblong groove which is partially of revolution that the upper surface includes, and interrupted by a stopper limiting the angular travel between the second component and the bolt within a turn, or else to constitute an angular stopper to an upper relief protruding from the upper surface of the second component and extending axially towards the bolt.