Snap fit attachment feature for a mullion assembly of a refrigerator appliance

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Solution Overview

Problem

The use of fasteners to attach mullion assemblies in refrigerator appliances increases manufacturing costs, decreases ergonomics during assembly, and introduces waste due to misalignment issues.

Innovation Solution

A snap-fit attachment feature using flange assemblies and notches to secure the mullion assembly to the refrigerator cabinet, eliminating the need for screws or fasteners.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If fasteners are used to attach the mullion assembly to the cabinet, then the attachment strength is improved, but the manufacturing cost increases and assembly ergonomics decrease

Engineering Contradiction:

Improveattachment strengthVSAvoidmanufacturing cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical fastening system (screws, clips, or other fasteners) with a snap-fit attachment system. The mullion assembly includes flange assemblies with outer bent ribs that engage with inner bent ribs formed in the cabinet, creating a fastenerless connection. This substitution eliminates the need for separate fastening components while maintaining attachment strength through the elastic engagement of the bent ribs.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent merges the attachment function into the flange assembly structure itself. The outer bent rib of the flange assembly integrates the fastening capability directly into the mullion assembly, eliminating the need for separate fasteners. The flange assembly simultaneously provides structural support and attachment functionality through its integrated bent rib design.

Inventive Principle:

Principle #5Merging (Combining)

2Strength

If fasteners are used to attach the mullion assembly to the cabinet, then the attachment strength is improved, but assembly ergonomics decrease

Engineering Contradiction:

Improveattachment strengthVSAvoidassembly ergonomics

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent replaces the mechanical fastening system requiring multiple steps (positioning, inserting, tightening) with a single-step snap-fit engagement. The flange assembly with outer bent ribs simply engages with the inner bent ribs in the cabinet, allowing rapid assembly without tools or complex maneuvers, significantly improving assembly ergonomics while maintaining attachment strength.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If fasteners are used to attach the mullion assembly to the cabinet, then the attachment strength is improved, but waste increases due to misalignment

Engineering Contradiction:

Improveattachment strengthVSAvoidwaste

Core Design Contradiction:

StrengthVSLoss of substance

Solution Approach 1:

The patent replaces the fastener system with a snap-fit engagement where the outer bent rib of the flange assembly elastically deforms to engage with the inner bent rib in the cabinet. This design is highly tolerant of misalignment because the elastic material can accommodate position variations, eliminating waste from discarded misaligned fasteners while maintaining secure attachment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes the elastic properties of the bent ribs to create a attachment system that accommodates dimensional variations and misalignment. The outer bent rib can elastically deform during engagement, allowing the system to absorb positioning errors without compromising attachment strength, thereby eliminating waste from misaligned fasteners.

Inventive Principle:

Principle #35Parameter changes

4Ease of manufacture

If a snap-fit attachment system is used instead of fasteners, then manufacturing cost decreases and assembly ergonomics improve, but the complexity of the flange assembly increases

Engineering Contradiction:

Improvemanufacturing costVSAvoidflange assembly complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent combines the structural flange assembly with the attachment function by integrating the outer bent rib directly into the flange assembly. This merging eliminates the need for separate fastening components, reducing overall part count and manufacturing complexity despite the increased sophistication of the flange assembly itself. The integrated design simplifies the overall system while maintaining attachment capability.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12460858B2Snap fit attachment feature for a mullion assembly of a refrigerator appliance

Publication Date: 2025.11.04 HAIER US APPLIANCE SOLUTIONS INC

AI summary

A refrigerator appliance may include a case body that defines a front end. The case body may include a front lip positioned at the front end. The refrigerator appliance may also include a mullion assembly. The mullion assembly may include a cosmetic mullion. The cosmetic mullion may include a flange and a main body. The flange of the cosmetic mullion may include an outer bent rib. The mullion assembly may also include a stiffener. The stiffener may include a flange and a main body. The mullion assembly may further include a mullion clip. The mullion clip may include an inner bent rib and a lance bridge.