Electrical Contact Spring Structure for Plug Blade Retention

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Solution Overview

Problem

Existing electrical contacts in wiring devices often fail to provide adequate blade retention and thermal performance, particularly in high-current applications.

Innovation Solution

The electrical contact features a double spring configuration with first and second arms and extending members that apply compressive force to the plug blade, enhanced by interaction with the housing surfaces, providing improved retention and thermal performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing electrical contact designs are used, then the device complexity is low, but the blade retention and thermal performance are inadequate

Engineering Contradiction:

Improveblade retentionVSAvoidcontact structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electrical contact is divided into multiple functional segments including first and second arms, first and second extending members, and integration with the housing. This segmentation allows each component to perform specific functions (retention, thermal management, structural support) independently, improving overall blade retention through coordinated action of multiple segments rather than a single complex component

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrical contact design merges multiple functions into an integrated structure where the arms, extending members, and housing work together as a unified system. The extending members integrate with the housing to provide both mechanical retention and thermal pathways, combining retention function and thermal management in a single integrated design rather than separate components

Inventive Principle:

Principle #5Merging (Combining)

2Temperature

If existing electrical contact designs are used, then the manufacturing process is simple, but the thermal performance in high-current applications is insufficient

Engineering Contradiction:

Improveheat dissipationVSAvoidcontact structure complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The extending members serve multiple functions simultaneously: they provide mechanical retention force against the blade, establish thermal pathways for heat dissipation, and maintain structural integrity. This multi-functionality allows the same structural elements to address both retention and thermal performance without adding separate dedicated components for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The extending members act as intermediary elements between the electrical contact arms and the housing, transmitting both mechanical retention force and thermal energy. These intermediary structures facilitate heat transfer from the contact point to the housing while simultaneously providing the mechanical framework for blade retention

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If a monolithic contact design is used, then the manufacturing precision is high, but the ease of manufacture decreases

Engineering Contradiction:

Improvecontact geometry precisionVSAvoidmanufacturing complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The design incorporates pre-formed extending members that are integrally formed with the arms and housing structure. This preliminary formation of the retention and thermal pathways during the base manufacturing process eliminates the need for post-assembly operations, achieving high geometric precision for the contact geometry while maintaining ease of manufacture through integral forming

Inventive Principle:

Principle #10Preliminary action

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 ensures secure plug blade retention and enhanced heat dissipation, especially in high-current scenarios, by utilizing a monolithic or integrally formed contact design with spring-like segments that interact with the housing to maintain contact pressure and improve thermal management.

Implementation Method 1

the first segments are primary springs, the second segments are secondary springs

Methodology Applied

Scientific EffectSpring: Spring

Implementation Method 2

each of the first and second wipes include first, second, and third segments... configured to exert a respective spring force on the plug blade

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 3

enhanced heat dissipation... improved thermal performance... enhance thermal pathways

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250372907A1Electrical contact for use in an electrical wiring device

Publication Date: 2025.12.04 LEVITON MFG CO INC

AI summary

The present disclosure relates to an improved electrical contact configured to be used in a wiring device (e.g., an electrical receptacle, a GFCI, an AFCI, etc.). The electrical contact being arranged and configured to apply a compressive force against a plug blade from a plug inserted therein. In some embodiments, the electrical contact includes a base or terminal portion and first and second arms or wipes extending from the base or terminal portion, the arms or wipes including extending members or segments. The extending members or segments arranged and configured to contact a wall or surface of the housing of the wiring device to assist in providing the compressive force.