Bracelet Clasp With Telescopic Rack Adjustment
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Solution Overview
Problem
Existing bracelet clasps require disassembly or addition/removal of links for length adjustment, which is inconvenient and not suitable for subtle changes in wrist size due to temperature variations, and often necessitates tools, affecting aesthetics and precision.
Innovation Solution
A bracelet clasp with a device comprising telescopic bars, fixing rods, and a movable element with a rack and pin system that allows for easy and precise length adjustment without disassembly, using push buttons and springs to unlock and fold branches for adjustment, ensuring the mechanism is concealed and does not compromise aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional bracelet clasps are used, then the bracelet structure is simple and aesthetic, but the length adjustment requires disassembly or adding/removing links which is complex and requires tools
Solution Approach 1:
The adjustment device is nested within the clasp structure, with the movable element sliding within the cover and the branches folded within the clasp body. The telescopic bars are housed within the cover structure, creating a compact integrated design that maintains aesthetic appearance while enabling adjustment functionality.
Solution Approach 2:
The clasp incorporates movable elements that can slide along the rack, branches that can fold relative to each other, and telescopic bars that can extend and retract. These dynamic components enable length adjustment without disassembly, transforming the static clasp into an adjustable mechanism.
2Adaptability or versatility
If links are added or removed for adjustment, then the bracelet length can be changed, but the operation requires dexterity and tools and affects aesthetics
Solution Approach 1:
The bracelet is divided into adjustable segments through the movable element that can slide to different positions on the rack, and the branches that can fold to different configurations. This segmentation allows continuous length adjustment rather than discrete link additions or removals.
Solution Approach 2:
The movable element with rack and pinion acts as an intermediary mechanism between the user's adjustment action and the final bracelet length change. The telescopic bars and folding branches serve as intermediate components that translate simple button pressing into precise length adjustment.
3Ease of operation
If the adjustment device is visible, then the adjustment function is accessible, but the aesthetic appearance of the bracelet is compromised
Solution Approach 1:
All adjustment components including the movable element, rack, telescopic bars, and branches are nested within the cover and clasp structure. The cover conceals the mechanical elements while push buttons remain accessible on the exterior, maintaining aesthetic appearance while enabling operation.
Solution Approach 2:
The cover is designed with selective transparency or opening only where necessary for button access, while the majority of the adjustment mechanism remains concealed. This localized exposure maintains overall aesthetic appearance while providing operational accessibility.
4Reliability
If the clasp is made secure with locking mechanisms, then reliability is improved, but the ease of opening and adjustment is reduced
Solution Approach 1:
The retaining means automatically engage with the locking pin to secure the clasp without user intervention. The elastic element provides automatic locking action, and the push buttons provide self-contained release mechanisms that do not require external tools or complex operations.
Solution Approach 2:
The elastic element replaces complex mechanical locking systems with a simpler spring-based retention mechanism. The push buttons substitute for manual manipulation of multiple locking components, providing a single-action release system that maintains security while improving ease of operation.
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
Enables fine and easy adjustment of bracelet length without tools, maintaining aesthetic appeal and preventing accidental dismantling, adapting to subtle changes in wrist size without altering the bracelet's appearance.
Implementation Method 1
Two push buttons 17 are placed in through openings 18 of the side walls 4 of the cover 2 and are accessible by a user regardless of the position of the clasp. On pressing these push buttons 17 against the action of an elastic force, exerted for example by springs 19, the retaining means 16 release the locking pin 12
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The device has a cover (2) attached to a link point (10a) of a strap (1) and including two sidewalls (4) extending in an axis of the strap. A mobile element (20) i.e. sling, is attached to another link point (10b) of the strap. The cover comprises a closed rack on internal surfaces of the walls. The rack comprises notches in which pins (26) of the element slide, where positions of the element with respect to the cover are determined by the notches. An elastic component i.e. spring stop (30), moves the element along direction of bottom of the notches for blocking the pins in the notches.