Watch Strap Clasp Notching Adjustment Mechanism
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Solution Overview
Problem
Existing watch strap clasps, particularly those with folding mechanisms, do not allow for easy adjustment of bracelet length to accommodate varying wrist sizes due to temperature changes or activity levels, and existing adjustment systems are complex or prone to inadvertent misadjustment, leading to discomfort and risk of losing the watch.
Innovation Solution
A watch strap clasp with a frame, cover, and slide system featuring notching and stop members that allow for precise adjustment of the slide's position along the longitudinal axis, requiring the clasp to be fully opened for change, thus minimizing inadvertent actuation and ensuring secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adjustment system with a pusher and tilting stop structure is used, then the bracelet length can be adjusted, but the system becomes complex and prone to inadvertent misadjustment
Solution Approach 1:
The adjustment system is segmented into distinct functional elements: the slide component, the notching structure on the stretchers, and the stop member. This segmentation allows each element to perform its specific function independently, simplifying the overall system while maintaining adjustability. The slide moves independently along the longitudinal axis, the notching provides discrete positioning, and the stop member provides the limiting constraint.
Solution Approach 2:
The invention uses simple, robust components that are easy to manufacture and replace if needed. The notching and stop member are integral parts of the stretcher structure, eliminating the need for complex movable adjustment mechanisms. This approach prioritizes simplicity and reliability over sophisticated adjustability.
2Adaptability or versatility
If a complex rack and articulation system is used for adjustment, then the bracelet length can be adjusted, but the manufacturing complexity increases
Solution Approach 1:
The invention merges the adjustment function with the existing structural elements of the clasp. The notching is formed directly on the stretchers, and the stop member is integrated into the stretcher structure. This merging eliminates the need for separate adjustment mechanisms and reduces manufacturing steps while maintaining the ability to adjust bracelet length.
Solution Approach 2:
Instead of using a complex movable mechanism to achieve adjustment, the invention inverts the approach by using a fixed notched structure with a simple sliding component. The adjustment is achieved through the interaction of the slide moving along the notched stretcher, rather than through complex articulation and rack systems.
3Ease of operation
If the slide can be adjusted while the clasp is closed, then adjustment is convenient, but inadvertent misadjustment may occur causing discomfort or watch loss
Solution Approach 1:
The notching structure on the stretchers provides preliminary positioning that prevents the slide from moving to arbitrary positions. The discrete notched positions ensure that adjustment only occurs at predetermined intervals, reducing the risk of inadvertent misadjustment while maintaining ease of operation through simple slide movement.
Solution Approach 2:
The stop member is pre-positioned on the stretcher to limit the range of motion of the slide. This preliminary constraint ensures that the slide cannot move beyond safe adjustment limits, preventing inadvertent misadjustment that could cause discomfort or watch loss while still allowing convenient adjustment within the permitted range.
Data Source
Figure 1~2
Figure 3
Figure 4a~4c
AI summary
The invention relates to a watch strap clasp, comprising: - a frame (10) having a base (100) and at least one first pair of straps (102), and - a first cover (12) connected to the frame (10) by means of a first strand (20) articulated with the frame (10), - a first slide (30), the first end of which is mounted to slide in the first cover (12) along the longitudinal axis of the clasp, and the second end of which is intended to be connected to a strap, said slide comprising a first pair of pads (32), between which the first strand (20) is capable of taking its place when the clasp is in the locked position, said pads being then arranged opposite the straps (102), characterized in that it comprises a structure for adjusting the position of the first slide (30) with reference to the cover (12) along the longitudinal axis, said adjustment structure being formed by a notch (50) arranged on said pads,and by a stop (60), integral with the shafts (102), the notching (50) and the stop (60) being arranged to cooperate with each other and block the translation of the first slide (30) when the clasp is in the locked position.