Waist Girth Adjuster with Sliding Guide Rail and Pressing Piece

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Solution Overview

Problem

Conventional waist girth adjustors for trousers cause wrinkles and are inconvenient to use due to structural defects and fixed installation, leading to untidy appearance and inadequate size accommodation for varying body types.

Innovation Solution

A waist girth adjustor with a guide rail and position fixing unit, featuring a unidirectional saw-like latch and rotatable pressing piece, is integrated into the inner and outer overlapping portions of the trousers, allowing for adjustable waist girth without exposing the guide rail, ensuring a neat appearance and easy operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the boss plate and fixing member are coupled to adjust waist girth, then the waist girth can be adjusted according to body conditions, but a space expands between the inner and outer overlapping portions causing wrinkles and untidy appearance

Engineering Contradiction:

Improvewaist girth adjustabilityVSAvoidappearance neatness

Core Design Contradiction:

Adaptability or versatilityVSShape

Solution Approach 1:

The pressing piece is extracted from the conventional fixed installation and transformed into a movable component that can be positioned and fixed at different locations along the guide rail, allowing adjustment while maintaining a neat appearance by eliminating the expanding space between overlapping portions

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The pressing piece is designed to be movable along the guide rail and fixable at different positions, transforming the static adjustment mechanism into a dynamic one that adapts to different waist girth requirements while preventing wrinkles through proper positioning

Inventive Principle:

Principle #15Dynamics

2Device complexity

If the pressing piece is installed on the inner side of the trousers, then the structure is compact, but it is inconvenient for the wearer to adjust the waist girth

Engineering Contradiction:

Improvestructural compactnessVSAvoidadjustment convenience

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

Instead of installing the pressing piece on the inner side as in conventional designs, the pressing piece is installed on the outer side of the trousers, making it easily accessible to the wearer for adjustment while maintaining structural compactness through the guide rail mechanism

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If the waist girth is fixed when trousers are manufactured, then the manufacturing process is simple, but the trousers cannot accommodate changing body conditions or weight gain

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidbody type accommodation

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The waist band is segmented into inner and outer overlapping portions that can be separably cut away, and the pressing piece can be positioned at different locations along the guide rail, allowing the trousers to accommodate different body conditions while maintaining simple manufacturing processes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guide rail and pressing piece mechanism provides multi-functionality, allowing the same trousers structure to accommodate various waist girth requirements by simply repositioning the pressing piece, eliminating the need for multiple sizes

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 provides a flexible and convenient waist girth adjustment that prevents wrinkles and ensures a snug fit, maintaining a neat appearance while accommodating various body types without the need for frequent size changes.

Implementation Method 1

a pressing piece rotatably coupled to one side of the movable member about a hinge shaft and resiliently supported by the side of the movable member to be caught by and fixed to the latch

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS9198475B2Waist girth adjuster and trousers having same

Publication Date: 2015.12.01 PARK HAE OH

AI summary

Disclosed are a waist girth adjustor which can flexibly adjust a waist girth according to various body types of a wearer wearing trousers, and a pair of trousers having the same. The waist girth adjustor installed in inner and outer overlapping portions formed by separably cutting away one or more portions of a waist band of a pair of trousers to adjust a waist girth of the trousers, comprises: a guide rail sewn in the inner overlapping portion transversely and having a latch on an upper part thereof and a boss protruding along a lengthwise direction of one side that contacts with the inner overlapping portion; and a position fixing unit including a movable member having a first insertion portion such that the movable member is slidably coupled to the guide rail, a pressing piece rotatably coupled to one side of the movable member about a hinge shaft and resiliently supported by the side of the movable member to be caught by and fixed to the latch, and a fixing member coupled to one side of the movable member such that the movable member is fixed to and installed in the outer overlapping portion.