Adjustable Watch Strap Buckle With Fine Seat Positions
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Solution Overview
Problem
Existing wristwatch straps often have fixed, coarse adjustment increments that fail to accommodate minor variations in wrist size, leading to discomfort due to straps being too tight or too loose, especially with fluctuations in wrist size due to temperature or activity.
Innovation Solution
An adjustable watch strap component with a buckle frame featuring apertures and cantilever springs that allow the buckle bar to slide between proximal and distal seats, enabling fine-tuned adjustments in 2.5 millimeter increments without tools, securely retaining the buckle bar and preventing accidental detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed adjustment increments are used in watch straps, then manufacturing simplicity is maintained, but adaptability to different wrist sizes is reduced
Solution Approach 1:
The aperture is segmented into multiple discrete seating positions (first seat, second seat, third seat) along the slot, allowing the buckle bar to engage at different locations to achieve different strap lengths. This segmentation enables fine-adjustment in small increments while maintaining a simple integrated aperture structure.
Solution Approach 2:
The aperture transitions from a static fixed-hole design to a dynamic structure with a slot and multiple seating positions, allowing the buckle bar to move along the slot and engage at different positions. This dynamic capability provides continuous adjustability without requiring multiple separate components.
2Manufacturing precision
If coarse adjustment increments are used, then device complexity is reduced, but comfort and precision of fit deteriorate
Solution Approach 1:
The aperture is divided into distinct seating zones (first seat, second seat, third seat) positioned at specific intervals along the slot, enabling precise adjustment in small increments (e.g., 2.5mm) while maintaining a single integrated aperture component for simple manufacturing.
Solution Approach 2:
Different regions of the aperture serve different functions: the slot provides movement freedom, the first seat provides a retracted position, the second seat provides an extended position, and the third seat provides an intermediate position. This local differentiation achieves high adjustment precision within a simple overall structure.
3Ease of operation
If the buckle bar is made easily movable, then ease of operation is improved, but reliability of retention deteriorates
Solution Approach 1:
The cantilever springs are pre-loaded to exert a retaining force on the buckle bar, preventing accidental detachment. The springs are positioned and tensioned to provide automatic retention while allowing intentional movement when force is applied by the user.
Solution Approach 2:
The cantilever springs automatically engage and disengage from the buckle bar through elastic deformation, providing self-retaining and self-releasing functionality without requiring additional locking mechanisms or complex operations by the user.
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 precise, intuitive length adjustments to accommodate a wide range of wrist sizes and temporary conditions, ensuring a comfortable fit without requiring disassembly or tools, while maintaining structural integrity and aesthetic consistency.
Implementation Method 1
a first cantilever spring configured to retain the buckle bar in the proximal seat and a second cantilever spring configured to retain the buckle bar in the distal seat
Data Source
AI summary
One variation of a wrist strap buckle includes a tang including: a base configured to pivot about a buckle bar passing through an end of a first strap segment of a wrist strap; and a tongue configured to insert into holes, arranged at a pitch distance, along a second strap segment of the wrist strap. This variation of the wrist strap buckle further includes a buckle frame including a center section, and a lobe extending from the center section and defining an aperture including: a proximal bore configured to receive the buckle bar in a lengthened configuration; a distal bore, offset from the proximal bore by less than the pitch distance, configured to receive the buckle bar in a shortened configuration; and a slot extending between the proximal and distal bores. This variation of the wrist strap buckle further includes a slit extending through the lobe and intersecting the aperture.