Side Release Buckle Socket Undulation Design

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Solution Overview

Problem

Conventional side release buckles face challenges in achieving a balance between reduced weight and maintained strength, with the formation of V-shaped cutouts for weight reduction compromising the socket's deformation resistance and requiring increased thickness.

Innovation Solution

The introduction of undulations on the top and bottom surfaces of the socket, formed by linear concave and convex features, enhances rigidity without thickness changes, allowing for weight reduction and guiding the legs during insertion while preventing deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If V-shaped cutouts are formed in the socket to reduce weight, then the weight of the buckle is reduced, but the strength and deformation resistance of the socket is compromised

Engineering Contradiction:
Improveweight of the buckleVSAvoiddeformation resistance of the socket
Core Design Contradiction:
Weight of moving objectVSStrength

Solution Approach 1:

The patent applies curvature by forming undulations (concave and convex curved surfaces) on the socket body instead of using flat surfaces with cutouts. This corrugated structure provides both weight reduction and enhanced deformation resistance through the geometric properties of curved surfaces, resolving the contradiction between weight reduction and strength maintenance.

Inventive Principle:
Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent transitions from a two-dimensional surface with cutouts to a three-dimensional corrugated structure with undulations extending in multiple directions. This dimensional change allows the socket to achieve both weight reduction and enhanced strength through the spatial configuration of the undulating surfaces.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Strength

If the thickness of the socket is increased to maintain strength after forming cutouts, then the deformation resistance is improved, but the weight reduction benefit is lost

Engineering Contradiction:
Improvedeformation resistance of the socketVSAvoidweight of the buckle
Core Design Contradiction:
StrengthVSWeight of moving object

Solution Approach 1:

The undulating curved surfaces provide structural reinforcement without increasing thickness. The concave and convex regions create a corrugated pattern that inherently resists deformation while maintaining the original thickness, thus avoiding weight increase while preserving strength.

Inventive Principle:
Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent applies local quality by creating regions of varying thickness and density through the undulations. The concave and convex regions provide localized reinforcement where needed, while other areas remain thinner, achieving overall strength enhancement without uniform thickness increase and associated weight penalty.

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

This design effectively suppresses deformation, reduces material usage and production costs, and maintains the buckle's strength and guiding functionality.

Implementation Method 1

the body includes an undulation being continuously formed in an insertion direction of the legs on at least one of top and bottom surfaces of the body, the undulation being provided by a linear concave formed on an outer surface of the body and a linear convex formed on an inner surface of the body along the linear concave

Methodology Applied
Scientific EffectStructural reinforcement through undulation: Corrugation

Data Source

PatentEP2415365B1Side release buckle
Publication Date: 2015.07.01 YKK CORP
  • EP2415365B1 patent drawingFigure 1
  • EP2415365B1 patent drawingFigure 2~3
  • EP2415365B1 patent drawingFigure 4~5

AI summary

A side release buckle includes a plug (10) and a socket (20) into which the plug (10) is inserted for engagement. The plug (10) includes: a base (11) being provided with a belt attachment (19) and a pair of legs (12); and an engaging portion (14) being formed to each of the legs (11). The socket (20) includes: a body (21) being provided with a belt attachment (29) and an insertion opening (22); a housing space (23) being formed in the body (21) and capable of housing the legs (12) inserted from the insertion opening (22); and an engaged portion (24) being formed in the body (21) and engageable with the engaging portion (14). The body (21) includes an undulation (26) being continuously formed in an insertion direction of the legs (12) on at least one of top and bottom surfaces of the body (21).