Electrical Terminal Snap Retention for Solder-Free PCB Assembly

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Solution Overview

Problem

Existing electrical terminals for electronic devices face issues such as complex installation processes like insert molding and soldering, which pose health risks and increase manufacturing time and costs, and are prone to decoupling due to weak bonds with the housing and circuit board.

Innovation Solution

The electrical terminal design features a main body with a shoulder and a pivotable flag snap, allowing for easy installation without insert molding or soldering, and includes a compressible contact that secures within an orifice of the circuit board, along with shoulders and flag snaps to prevent movement, ensuring stable connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If insert molding and soldering are used to attach electrical terminals, then the connection strength is improved, but the manufacturing complexity and health risks increase

Engineering Contradiction:
Improveconnection strengthVSAvoidmanufacturing complexity
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The patent replaces complex chemical bonding processes (insert molding and soldering) with a simple mechanical retention system. The electrical terminal uses a retention rib that fits into a retention groove, creating a mechanical interlock that secures the terminal without requiring molding or soldering operations. This mechanical system eliminates the need for complex manufacturing processes while maintaining connection strength.

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

2Strength

If insert molding and soldering are used to attach electrical terminals, then the connection strength is improved, but the manufacturing time and costs increase

Engineering Contradiction:
Improveconnection strengthVSAvoidmanufacturing efficiency
Core Design Contradiction:
StrengthVSProductivity

Solution Approach 1:

The mechanical retention system eliminates time-consuming insert molding and soldering operations. The terminal can be simply inserted and retained through the rib-groove mechanism, dramatically reducing assembly time and enabling faster production cycles without compromising connection strength.

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

3Reliability

If traditional bonding methods are used, then the electrical terminal is securely attached, but the risk of decoupling due to weak bonds increases

Engineering Contradiction:
Improveconnection reliabilityVSAvoidbond stability
Core Design Contradiction:
ReliabilityVSStability of the object's composition

Solution Approach 1:

The retention system is divided into two functional segments: a retention rib on the electrical terminal and a corresponding retention groove in the housing. This segmentation creates a complementary mechanical interlock where the rib fits into the groove, preventing decoupling through a geometric constraint rather than relying on bond stability.

Inventive Principle:
Principle #1Segmentation

4Strength

If complex installation processes are used, then the connection strength is improved, but the ease of installation deteriorates

Engineering Contradiction:
Improveconnection strengthVSAvoidease of installation
Core Design Contradiction:
StrengthVSEase of operation

Solution Approach 1:

The complex multi-step processes of insert molding and soldering are replaced with a simple mechanical insertion process. The electrical terminal with its retention rib can be directly inserted into the housing with the retention groove, achieving secure attachment through a single straightforward action without requiring specialized equipment or skills.

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

Data Source

PatentEP4586410A1Electrical terminal for an electronic device
Publication Date: 2025.07.16 HONEYWELL INTERNATIONAL INC
  • EP4586410A1 patent drawingFigure 1A~1B
  • EP4586410A1 patent drawingFigure 2A~2B
  • EP4586410A1 patent drawingFigure 3

AI summary

An electrical terminal includes a main body that extends along a plane. The electrical terminal includes at least one shoulder extending away from the main body. The electrical terminal includes a flag snap positioned downward from the at least one shoulder. The electrical terminal can be installed within an electronic device. The electronic device includes a housing and a circuit board positioned within the housing.