String Adjustment Bobbin Structure With Elastic Locking

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Solution Overview

Problem

Conventional string adjusting devices for wearable and household products have complex structures, leading to high production costs, large thickness, and reduced aesthetics, making them inconvenient for users as they require cumbersome tightening and loosening processes.

Innovation Solution

A simplified string adjusting device with a reduced number of parts, comprising a base unit and a rotation unit with a bobbin and an engagement member that allows for easy winding and tightening of strings, featuring stop protrusions and an elastic engagement mechanism to manage string tension and length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a conventional string adjusting device with multiple components (base unit, middle unit, rotation unit, cover unit) is used, then the string tightening function is achieved, but the device complexity increases and manufacturing cost rises

Engineering Contradiction:

Improvestring tightening functionVSAvoidnumber of components

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent combines the base unit, middle unit, rotation unit, and cover unit into a simplified two-unit structure (base unit and rotation unit). The middle unit and cover unit functions are integrated into the rotation unit, reducing the total component count while maintaining the string tightening function through the bobbin and engagement member mechanism.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The rotation unit serves multiple functions: it houses the bobbin for string winding, provides the engagement member for locking/unlocking, and incorporates the stop protrusions for positioning. This multi-functional design eliminates the need for separate middle unit and cover unit components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If a conventional string adjusting device with four main components is used, then the string adjustment function is achieved, but the manufacturing cost increases

Engineering Contradiction:

Improvestring adjustment functionVSAvoidmanufacturing cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

By merging multiple components into two main units, the patent reduces the number of manufacturing steps, assembly operations, and quality control checkpoints. The simplified structure requires fewer precision-machined parts and less complex assembly procedures, directly lowering manufacturing costs.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If a conventional string adjusting device with multiple units is used, then the string tightening function is achieved, but the device thickness increases and aesthetics are reduced

Engineering Contradiction:

Improvestring tightening functionVSAvoiddevice thickness

Core Design Contradiction:

Ease of operationVSShape

Solution Approach 1:

The patent employs a nested structure where the bobbin is rotatably installed inside the rotation unit, and the engagement member is integrated within the rotation head. This nested arrangement allows components to occupy overlapping spatial volumes, reducing the overall thickness of the device while maintaining functional integrity.

Inventive Principle:

Principle #7Nested doll (Nesting)

4Device complexity

If a simplified string adjusting device with reduced parts is used, then production complexity and cost are reduced, but the engagement mechanism must be more precisely designed

Engineering Contradiction:

Improvenumber of partsVSAvoidengagement mechanism precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by concentrating precision requirements on specific critical features: the stop protrusions are precisely positioned on the bobbin, and the engagement member is designed with specific geometric features for reliable catching. While the overall device is simplified, these localized precision elements ensure reliable operation with fewer total parts.

Inventive Principle:

Principle #3Local quality

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 reduces production complexity and costs, enhances aesthetics by minimizing thickness, and simplifies the process of tightening and loosening strings, providing a more user-friendly experience.

Implementation Method 1

an engagement member formed and provided inside the rotation head to be elastically deformable and configured to be caught on the stop protrusions

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS11192748B2Apparatus for controlling string

Publication Date: 2021.12.07 TYRENN CO LTD

AI summary

The present invention relates to a string adjusting device. According to the present invention, there is provided a string adjusting device, including: a base unit including a base plate, a cylindrical lower housing provided on the base plate, and stop protrusions formed to protrude from an outer surface of the lower housing; and a rotation unit including a bobbin rotatably installed inside the housing and configured such that a string is wound therearound, a rotation head connected to one end portion of the bobbin, and an engagement member formed and provided inside the rotation head to be elastically deformable and configured to be caught on the stop protrusions.