Bracelet Clasp Spring Assembly Segmentation for Rigidity
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Solution Overview
Problem
Existing folding clasps face challenges in maintaining constructive rigidity while providing the necessary elasticity for proper leaflet attachment and release, particularly when forces are exerted on the spars or longitudinal members.
Innovation Solution
The implementation of a base element and leaflet comprising at least two spring blades as the elastic device, which allows for simultaneous pressure exertion to unlock the leaflets or leaflet from the base element, enhancing rigidity and elasticity through the use of thin spring blades and solid spacers to prevent warping and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single longitudinal member is used in the base element or leaflet, then the device complexity is reduced, but the constructive rigidity is insufficient and warping occurs
Solution Approach 1:
The patent applies segmentation by dividing each longitudinal member into multiple spring blades (at least two) that are stacked and articulated together. This segmentation allows each blade to contribute to the overall rigidity while maintaining the elasticity needed for the folding mechanism, thereby resolving the contradiction between structural simplicity and constructive rigidity.
2Ease of manufacture
If thin spring blades are used to provide elasticity, then the ease of manufacture is improved, but the constructive rigidity deteriorates due to warping
Solution Approach 1:
The patent segments the longitudinal members into multiple thin spring blades that are stacked together. This segmentation allows each individual blade to remain thin and easy to manufacture while the stacked assembly collectively provides the necessary rigidity and resistance to warping, thus resolving the contradiction between ease of manufacture and warping resistance.
3Strength
If multiple spring blades are stacked to double the stiffness, then the strength is improved, but the force required to unhook the leaflets increases
Solution Approach 1:
The patent employs dynamics by designing the spring blade assembly to be articulated and movable rather than rigidly fixed. The multiple spring blades can deflect and move during the unhooking process, allowing the increased stiffness to be dynamically managed. This enables the system to provide strong holding force when closed while still allowing controlled release when force is applied, resolving the contradiction between strength and unhooking force.
4Reliability
If solid spacers are added between spring blades to prevent friction, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent introduces solid spacers as intermediary elements between the spring blades. These spacers act as mediators that prevent direct contact and friction between the blades while maintaining the stacked configuration. This intermediary approach resolves the contradiction by providing reliable friction prevention without requiring complex mechanical structures, as the spacers are simple geometric elements integrated into the blade 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
This configuration doubles the stiffness of the spring assembly, maintaining deflection while requiring twice the force to unhook the leaflets, ensuring secure attachment and easy release, and avoids issues like warping and friction, with the option to fill spaces with soft materials for added comfort.
Implementation Method 1
an elastic device composed of at least two spring blades which make up each of the spars or longerons
Data Source
Figure 1~2
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Figure 6~7
AI summary
The bracelet clasp includes a rectangular base element wherein each of the long sides is formed of side bars each formed of at least two leaf springs forming an elastic device allowing first and second folding parts to be locked onto said base element and disengaged therefrom when a pressure is exerted simultaneously on said side bars.