Spring Bar Accessory Coupler for Tool-Free Secure Customization

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Solution Overview

Problem

Existing systems for attaching consumer products, such as smart devices, to users are often cumbersome, aesthetically unpleasing, and difficult to customize, posing risks of damage when users attempt to interchange accessory parts without professional help.

Innovation Solution

An accessory attachment apparatus comprising a spring bar, spring bar housing, and coupler with interchangeable components, allowing for quick and secure attachment of accessories like smart devices, with customizable and aesthetically appealing designs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional connecting means (pins and C-rings) are used to attach accessories, then the attachment is secure and reliable, but the operation becomes cumbersome and requires specialized tools

Engineering Contradiction:
Improveattachment securityVSAvoidattachment ease
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces traditional mechanical connecting means (pins and C-rings requiring tools) with a spring bar mechanism that uses elastic deformation and spring force for attachment and detachment, eliminating the need for specialized tools while maintaining secure connection

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The spring bar mechanism is designed to be self-operating, where the user can directly compress and release the spring bar to attach or detach accessories without requiring external tools or assistance, making the system self-servicing

Inventive Principle:
Principle #25Self-service

2Adaptability or versatility

If traditional accessory attachment systems are used, then the structure is simple, but the adaptability and customization options are limited

Engineering Contradiction:
Improvecustomization capabilityVSAvoidsystem complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The spring bar mechanism serves multiple functions: it acts as both the connecting element and the fastening mechanism, and can be used with various accessory types (watch bands, charms, protective covers), providing universal applicability without requiring different attachment systems for each accessory type

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The accessory system is divided into modular components (main body, spring bar, detachable accessories) that can be independently selected and reconfigured, allowing users to customize their accessory setup while maintaining a relatively simple overall structure

Inventive Principle:
Principle #1Segmentation

3Productivity

If users attempt to interchange accessory parts themselves, then the customization speed increases, but the risk of damage to ornamental parts increases

Engineering Contradiction:
Improvecustomization speedVSAvoiddamage risk
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The spring bar mechanism replaces fragile ornamental connecting parts with a robust elastic element that is resistant to damage during user handling, allowing safe self-service attachment and detachment operations

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The spring bar's elastic properties provide inherent cushioning and shock absorption during attachment operations, protecting both the spring bar itself and the connected components from damage due to improper handling or misalignment

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

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 easy customization and secure attachment of smart devices, enhancing user interaction and protection while maintaining a stylish appearance, facilitating quick changes based on occasion or need.

Implementation Method 1

The spring bar is configured to attach to the smart device and to the spring bar housing. The spring bar may be inserted into the recesses and the spring bar housing may hinge around the spring bar.

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentEP4117481B1Accessory attachment apparatus and methods related thereto
Publication Date: 2026.01.28 INTERLOKIT INC
  • EP4117481B1 patent drawingFigure 1
  • EP4117481B1 patent drawingFigure 2
  • EP4117481B1 patent drawingFigure 3

AI summary

Disclosed herein are accessory attachment apparatuses, comprising: a spring bar having a first end and a second end, the first end having a first depressible tip and the second end having a second depressible tip, each being configured to communicate with a first and second recess, respectively; a spring bar housing having an interior channel and configured to contain the spring bar; and a coupler disposed on an outer surface of the spring bar housing, the coupler having an outer size and an inner size, the inner size defining an interior space, the coupler comprising: an abutting segment in communication with the spring bar housing; a distal segment positioned opposite the abutting segment; and a first and a second spanning segment configured to span the abutting segment and the distal segment and to communicate thereto.