Watch Link Pivot Screw With Rotation-Prevention Zone
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Solution Overview
Problem
Existing assembly devices for watch bracelet links are prone to unwanted unscrewing due to repeated movements and knocks, requiring complex components and lengthy assembly times, and may be difficult to disassemble.
Innovation Solution
A pivotable assembly device featuring a screw with a guide pin that includes a rotation-prevention zone collaborating with a corresponding zone on the component, combined with radial retention means such as seals or toothsets, to securely attach and detach links with minimal clearance, allowing for axial immobilization and resistance to relative rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tubular barrel with annular narrowing is used to clamp the screw, then the risk of unwanted unscrewing is reduced, but assembly and disassembly operations become difficult
Solution Approach 1:
The retention system is segmented into multiple independent elements: the guide pin with rotation-prevention zone, the screw with corresponding collaboration zone, and radial retention means. This segmentation allows the screw to be prevented from rotating while still allowing controlled assembly and disassembly operations through the radial retention mechanism.
2Reliability
If multiple component parts are assembled to prevent rotation, then the risk of detachment is reduced, but the assembly time increases
Solution Approach 1:
The guide pin and screw are merged into a preassembled module where the pin is already housed in the screw. This integration reduces the number of separate assembly operations required, as the rotation-prevention mechanism is built into the assembly unit itself, thereby reducing overall assembly time while maintaining reliability.
Solution Approach 2:
The guide pin and screw are preassembled into a module before installation into the bracelet links. This preliminary action ensures that the rotation-prevention zones are already aligned and engaged, eliminating the need for complex alignment operations during final assembly and reducing assembly time.
3Reliability
If high clamping force is applied by the barrel to the screw, then axial immobilization is achieved, but the assembly becomes difficult to disassemble
Solution Approach 1:
The radial retention means provide dynamic retention that allows controlled movement during assembly and disassembly while maintaining axial immobilization during normal use. The retention mechanism can engage and disengage controllably, enabling easy disassembly when needed while preventing unwanted movement during wear.
Data Source
AI summary
The assembly device is intended for the pivoting attachment of at least two components (M1, M2). It comprises a screw (4) intended to be screwed into a first component (M1) and bearing a guide pin (5) guiding the pivoting of a second component (M2). According to the invention, the pin (5) comprises at least one rotation-prevention zone (540) having a shape designed to collaborate with a zone of corresponding shape of the first component (M1), so as to prevent said pin from rotating.