Rotating Accessory Clasp Structure for Easy One-Hand Fastening

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Solution Overview

Problem

Existing fastening implements for accessories require fine operations with fingertips, are difficult to use, and can impair the aesthetic appearance of the accessory due to their design, especially when putting on or taking off items like bracelets or necklaces.

Innovation Solution

A clasp member for accessories that includes a base portion connected to the accessory and a movable portion that can turn relative to the base, allowing easy opening and closing through a turning mechanism, with contact points between the base and movable portions to stabilize the coupling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a spring-ring type fastening implement is used, then the accessory can be fastened and unfastened, but fine operations with fingertips are required making it difficult to use

Engineering Contradiction:
Improveease of fastening and unfasteningVSAvoidcomplexity of fastening mechanism
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The fastening implement is divided into two separate fastening members (first and second), each with simple structure. Instead of using a complex spring-ring mechanism, the patent segments the fastening function into two simple members that can be easily operated separately, eliminating the need for fine fingertip operations while maintaining fastening capability.

Inventive Principle:
Principle #1Segmentation

2Reliability

If a buckle-type fastening implement is used, then the accessory can be secured, but the design may impair the aesthetic appearance of the accessory

Engineering Contradiction:
Improvesecurity of fasteningVSAvoidaesthetic appearance
Core Design Contradiction:
ReliabilityVSShape

Solution Approach 1:

The fastening members are designed with localized functional features only where needed for fastening, while the rest of the structure maintains a simple, clean appearance. The first and second fastening members have minimalistic designs that do not disrupt the overall aesthetic of the accessory, providing security only in the necessary locations without compromising visual appeal.

Inventive Principle:
Principle #3Local quality

3Adaptability or versatility

If traditional fastening members are used, then coupling can be achieved, but fine coupling operations are required that may need to be performed with one hand or without direct looking

Engineering Contradiction:
Improveflexibility of operationVSAvoidsimplicity of coupling operation
Core Design Contradiction:
Adaptability or versatilityVSEase of operation

Solution Approach 1:

The fastening members are designed to be dynamically operable - the first fastening member can be easily opened to form a gap, allowing the second fastening member to be inserted and coupled. This dynamic design enables one-handed operation and coupling without requiring precise visual alignment, as the members can be manipulated through simple opening and closing motions rather than fine adjustment operations.

Inventive Principle:
Principle #15Dynamics

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 smooth and stable coupling and uncoupling operations, maintaining the aesthetic appearance of the accessory while simplifying the user experience.

Implementation Method 1

a movable portion that is supported to be capable of turning relative to the base portion, and that opens and closes the clasp member for accessory by the turning

Methodology Applied
Scientific EffectTurning mechanism: Hinge

Data Source

PatentEP3782500B1Clasp member for accessory, clasp for accessory, and accessory
Publication Date: 2026.03.18 CROSSFOR
  • EP3782500B1 patent drawingFigure 1
  • EP3782500B1 patent drawingFigure 2
  • EP3782500B1 patent drawingFigure 3

AI summary

A member for accessory (20) includes: a base portion (21) that is connected to a part of an accessory (1); and a movable portion (31) that is supported to be capable of turning relative to the base portion (21), and that opens and closes the clasp member for accessory (20) by the turning. The clasp member for accessory (20) is separably coupled to a coupling subject portion. A base-side coupling portion (26) of the base portion (21) is arranged on one side in a longitudinal direction of the base portion (21), the one side being opposite to another side on which a connecting part of the base portion (21) is arranged, the connecting part being connected to the part of the accessory (1). Under a state in which the movable portion (31) is arranged at a closed position where the movable portion (31) closes the fastening member (20), an inner peripheral portion or an outer peripheral portion of a movable-side coupling portion (35) of the movable portion (31) and an outer peripheral portion or an inner peripheral portion of the base-side coupling portion (26) of the base portion are held in contact with or face each other, and a part of the base-side coupling portion (26) and a part of the movable-side coupling portion (35) are superimposed on each other in the longitudinal direction of the base portion (21).