Bracelet Clasp Length Adjustment via Threaded Rod Mechanism
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Solution Overview
Problem
Existing bracelet clasps with folding buckles lack fine adjustment capabilities, often requiring the clasp to be opened for length adjustments, and the use of wheels with axes perpendicular to the bracelet plane results in a bulky design that is uncomfortable to wear.
Innovation Solution
A bracelet clasp featuring a threaded rod parallel to the bracelet plane, linked to a mobile strand, allows for continuous length adjustment via a knob that screws or unscrews, enabling precise adjustments without opening the clasp and reducing the thickness of the prominent wheel portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wheel with axis perpendicular to the bracelet plane is used for adjustment, then the adjustment mechanism can be implemented, but the clasp thickness increases significantly
Solution Approach 1:
The patent changes the orientation of the adjustment wheel axis from perpendicular to the bracelet plane to parallel with the bracelet plane. This dimensional reorientation allows the wheel to be positioned within the plane of the clasp, eliminating the need for significant protrusion and thus reducing clasp thickness while maintaining adjustment functionality.
Solution Approach 2:
The adjustment mechanism is integrated directly into the clasp structure by positioning the wheel and threaded rod within the clasp body rather than as a separate protruding component. This merging of the adjustment mechanism with the clasp structure eliminates the need for additional thickness.
2Adaptability or versatility
If a notched mechanism is used for length adjustment, then adjustment can be made, but only in stages corresponding to the distance between notches
Solution Approach 1:
The patent replaces the notched mechanical engagement system with a threaded rod and wheel mechanism. The threaded rod allows for continuous adjustment by rotating the wheel, which moves the first strand along the threaded rod in small, precise increments rather than in discrete notched stages, thereby improving adjustment precision.
3Device complexity
If the adjustment mechanism is integrated into the clasp, then the clasp structure is compact, but the clasp must be opened to make adjustments
Solution Approach 1:
The patent extracts the adjustment wheel and threaded rod mechanism from the interior of the clasp and positions it on the outer surface of the clasp body. This allows the wheel to be accessible and operable when the clasp is closed, eliminating the need to open the clasp for adjustment while maintaining a compact integrated structure.
4Ease of operation
If a wheel with axis perpendicular to the bracelet plane is used, then the adjustment mechanism functions, but the wheel must protrude significantly above the clasp
Solution Approach 1:
The patent reorients the wheel axis from perpendicular to the bracelet plane to parallel with the bracelet plane. This allows the wheel to be manipulated from the side rather than requiring significant vertical protrusion, reducing the thickness requirement while maintaining ease of manipulation through the grooved side profile.
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 continuous, fine adjustment of the bracelet length over a large range while maintaining a slim profile, enhancing comfort and usability.
Implementation Method 1
A bracelet clasp (1) intended to assemble a first (2) and a second (3) strand of a bracelet to open or enlarge the bracelet, comprising a threaded rod (20) parallel to the plane of the bracelet. The threaded rod is linked to a first mobile strand (2) of the bracelet. A knob (18) whose longitudinal position is fixed relative to the second strand (3) of the bracelet can be turned so as to screw or unscrew the rod (20) in the knob (18) or in the first strand (2), so as to move the first strand (2) relative to the knob (18).
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Bracelet clasp (1) allowing fine adjustment of the length of the bracelet. A finger wheel (18) accessible through a window in the cover can be rotated in order to turn a threaded rod (20) in either direction about its axis and so move one strand (2) of the bracelet relative to the cover (10).