Bracelet Clasp Sliding Adjustment Mechanism
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Solution Overview
Problem
Existing bracelet clasps with folding buckles are difficult to manipulate, as the pin can overhang and block the arm in undesired positions, leading to unreliable locking and unintended length changes when opening or closing.
Innovation Solution
A bracelet clasp design featuring articulated blades with a sliding fastening member between a cover and a base plate, allowing for easy adjustment by perpendicular pressure, with notches and pushers for secure locking and length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a folding buckle mechanism with articulated arms and pin is used, then the clasp can be closed and locked, but the pin may overhang and block the arm in undesired positions due to play
Solution Approach 1:
The clasp is divided into two separate blades (first blade and second blade) that are articulated but can be independently positioned. The locking mechanism is segmented into a locking element on one blade and a corresponding locking feature on the other blade. This segmentation allows each blade to be adjusted and locked independently, preventing the pin overhang problem while maintaining reliable locking.
Solution Approach 2:
The blades are designed with pre-defined locking positions and features that engage before the articulation pin can overhang or block movement. The locking element and locking feature are positioned such that engagement occurs at predetermined points, eliminating play-induced blocking while ensuring reliable locking.
2Adaptability or versatility
If the clasp uses a traditional folding buckle design, then it can secure the bracelet, but adjustment of bracelet length is difficult and time-consuming
Solution Approach 1:
The locking element is designed to be movable between locked and unlocked positions, allowing dynamic adjustment of the bracelet length. The user can easily transition between different length configurations by moving the locking element, making the clasp adaptable to different wrist sizes while enabling quick adjustment without time loss.
3Adaptability or versatility
If the pin is allowed to move with the arm, then the mechanism has flexibility, but the pin may block the arm in undesired positions
Solution Approach 1:
The articulation is segmented into controlled movement zones where the pin is constrained to specific paths or positions. The locking features are positioned to engage at predetermined points along the articulation path, allowing flexibility within defined limits while preventing blocking in undesired positions through the segmented structure.
Data Source
AI summary
A bracelet clasp including first and second blades, the first blade being articulated to the second blade by a first end, between a closed position, in which the second blade is folded over the first blade, and an open position in which the second blade is free from the first blade, the second blade bearing, at a second end, a member for fastening a first bracelet strand, a second bracelet strand being connected at least indirectly to the first blade. A locking device holds the first blade in its closed position. A device for adjusting the wear length of the bracelet includes a cover mounted on a base plate secured to the second end of the second blade, and the member for fastening the first bracelet strand sliding between the cover and the base plate in a longitudinal direction of the clasp between a first position in which the fastening member is at least partially engaged in the cover of the clasp towards at least a second position in which the fastening member is free from the cover of the clasp by pressure on the cover in a direction perpendicular to the clasp to cause same to slide.