Quick-Release Watch Clasp With Segmented Locking Mechanism
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Solution Overview
Problem
Existing quick-release systems for watch straps, particularly in the 'Haute Horlogerie' sector, fail to meet high demands for ease of use and security, and often require complex mechanisms that limit the interchangeability of straps with different materials and lengths.
Innovation Solution
A quick-release system featuring an end link with a mobile end piece that slides parallel to a retaining stem, a locking mechanism with a push button and locking pin, and a spring-loaded design for secure and tool-free strap changes, allowing for easy conversion of existing clasps to support interchangeable straps of varying lengths and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring bar with protruding pin is used for quick release, then tool-free strap changing is enabled, but the locking element is subjected to high stress and security is reduced
Solution Approach 1:
The locking mechanism is divided into separate functional components: a push button for operation, a locking pin for security, and a spring bar for connection. This segmentation allows each element to be optimized for its specific function while working together as a integrated system that provides both ease of operation and high reliability.
Solution Approach 2:
The locking pin acts as an intermediary element between the push button and the spring bar. It transfers the locking action from the button to the connection point, providing a mechanical advantage that increases locking security while maintaining easy operation through the button interface.
2Reliability
If complex locking mechanisms are implemented for high security, then strap interchangeability is improved, but device complexity increases
Solution Approach 1:
The spring-loaded locking pin automatically engages with the spring bar when the push button is released, providing self-locking functionality. This eliminates the need for additional locking steps or complex mechanisms while maintaining high security through the inherent mechanical advantage of the spring-loaded design.
Solution Approach 2:
The complex multi-component locking mechanisms are replaced with a simplified spring-loaded pin system that uses elastic potential energy storage and release to achieve secure locking. This substitution reduces the number of parts and assembly steps while maintaining or improving locking reliability.
3Ease of operation
If visible fastening elements are used for strap attachment, then ease of operation is improved, but aesthetic appearance deteriorates
Solution Approach 1:
The locking pin and spring bar are merged into a single integrated component that serves both functional and aesthetic purposes. When locked, the pin is concealed within the clasp structure, creating an invisible fastening appearance while maintaining full quick-release functionality through the push button mechanism.
Solution Approach 2:
The locking pin is nested within the clasp body when in the locked position, with only the push button visible on the exterior. This nesting arrangement allows the fastening mechanism to remain hidden during normal wear while remaining accessible for operation, thus preserving aesthetic appearance without compromising ease of use.
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 system provides high operating comfort, security, and flexibility, enabling easy and secure strap changes without tools, reducing manufacturing complexity and costs, while allowing for instant strap length adjustments and material changes.
Implementation Method 1
the mobile end piece comprises at least one spring cooperating with the push button to maintain it in its locked position
Data Source
Figure 1a~1b
Figure 2a~2d
Figure 3a~6b
AI summary
The invention relates to a quick release system for an interchangeable watch strap on a clasp, the quick release system comprising: - an end link (1) for securing the watch strap (100) on the clasp (1000), the end link comprising a body (10) and two lateral end piece placed on each side of the body (10), a first lateral end piece (11) being in one piece with the body (10) and a mobile end piece (12), able to slide away from the body (10), - a first bar (2) comprising a first end (20) being fixed to the first lateral end piece (11) and a second free end (21) cooperating with a bore (13) of the mobile end piece (12); - a second bar (3) extending from the first end piece (11), comprising a first end (30) able to slide inside the first end piece (11), and a second end articulated to the mobile end piece (12); - a retaining stem (4) arranged coaxial and fixed to the second bar (3), so that the mobile end piece (12) is moveable parallel to a longitudinal axis of said retaining stem (4), , - locking means to lock the mobile end piece (12) on the body (10).