Watch Band Adjustment Assembly for Tool-Free Link Removal

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Solution Overview

Problem

Existing watch band adjustment mechanisms are inconvenient due to the need for specific tools, prone to scratching, and have high production costs.

Innovation Solution

A watch band adjustment unit with a fixed unit, rotating parts, and an interference fit rod assembly or screw assembly that allows easy assembly and disassembly, featuring snap-in channels and elastic parts to control rotation, reducing friction and production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional through-insertion connecting pins are used to connect metal band pieces, then the band structure is strong and stable, but specific tools are required for assembly and disassembly, making it inconvenient when band length adjustment is needed

Engineering Contradiction:

ImproveConvenience of band length adjustmentVSAvoidComplexity of assembly mechanism

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The band is divided into multiple adjustable segments (band pieces) that can be independently positioned. The adjustment mechanism is segmented into rotating parts, fixed parts, and connecting pins, allowing each component to perform its specific function independently while contributing to the overall adjustability of the band length.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A connecting pin acts as an intermediary element between the rotating parts and fixed parts. The pin transfers rotational motion and force between components, enabling the band pieces to be adjusted to different positions while maintaining a secure connection without requiring external tools.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If rotating parts with protruding fixed pins are designed for pull-and-rotate adjustment, then band length adjustment becomes convenient, but the protruding pins can scratch the product due to friction

Engineering Contradiction:

ImproveConvenience of band adjustmentVSAvoidScratching of product surface

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The elastic component serves as a mediator between the rotating part and the band piece. It transmits the rotational force while providing a cushioning effect that prevents direct metal-to-metal contact and friction, thereby eliminating scratching of the product surface during adjustment operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The elastic component is pre-installed in the adjustment mechanism to provide cushioning before any scratching can occur. This elastic element absorbs and distributes the friction forces during rotation, protecting the band piece surface from scratches before the harmful friction effect can manifest.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of operation

If complex assembly structures with multiple components are used to enable tool-free adjustment, then band length adjustment becomes convenient, but production costs increase

Engineering Contradiction:

ImproveConvenience of tool-free assemblyVSAvoidProduction cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The rotating part serves multiple functions: it acts as a grip for user manipulation, a connector to the band piece, a positioning mechanism for adjusting band length, and a driver for the connecting pin. This multi-functionality reduces the number of separate components needed, simplifying the overall structure and reducing production costs while maintaining tool-free adjustability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the functions of the adjusting mechanism and the connecting mechanism into a single integrated assembly. The rotating part, connecting pin, elastic component, and fixed part work together as a unified system rather than separate mechanisms, reducing the total number of parts and assembly steps, thereby lowering production costs while achieving tool-free adjustment.

Inventive Principle:

Principle #5Merging (Combining)

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

The solution simplifies assembly, reduces production costs, and prevents scratching by controlling rotation forces effectively, enhancing product stability and precision.

Implementation Method 1

an elastic part limited by the interference fit rod and the snap-in limiting part

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

an interference fit rod that penetrates the fixing parts and the fixed unit and then interference fits with the rotating parts

Methodology Applied

Scientific EffectInterference fit: Mechanical Fastener

Data Source

PatentUS20260007212A1Watch Band Adjustment Unit

Publication Date: 2026.01.08 GUANGDONG YIFENGSHENG TECH CO LTD

AI summary

This invention concerns improved watch band adjustment unit, comprising a fixing unit, fixing pieces, rotating pieces on the left and right sides, and a passing fixing component. The fixing unit, fixing pieces, and rotating pieces form a first locking channel; the fixing pieces and rotating pieces form a second locking channel, with a locking limit portion. The fixing component is an interference fit rod or screw. When the rotating pieces are pulled and rotated, they compress an elastic member and disengage from the first fixing rod, allowing the adjacent adjustment unit to be mounted or dismounted, enabling quick assembly and reducing production costs.