Reinforced Refrigerator Shelf Frame Without Adhesive Bonding
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Solution Overview
Problem
Conventional glass shelves for refrigerators are costly and complex due to over-molded or adhesive-based constructions, and lack reinforcement for increased loading capacity, while wire-frame shelves directly attached to the refrigerator liner do not provide the aesthetic and strength benefits of glass and plastic combinations.
Innovation Solution
A shelf assembly featuring a rigid injection-molded plastic frame with a hidden reinforcing support frame and a monolithic support channel, allowing for secure attachment to the appliance interior without adhesives, enhancing loading capacity and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional glass shelves use over-molded or adhesive-based constructions, then aesthetic appeal is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The shelf is divided into separate components: a glass shelf panel and a plastic frame assembly. The plastic frame is further segmented into a outer frame and an inner reinforcing frame that can be inserted into channels. This segmentation allows each component to be manufactured independently using simpler processes, reducing overall manufacturing complexity while maintaining aesthetic appeal through the glass surface.
Solution Approach 2:
The patent combines the glass shelf panel with a plastic frame assembly that includes both structural and aesthetic functions. The plastic frame merges the support function with the aesthetic finish, eliminating the need for separate over-molding or adhesive applications. The inner reinforcing frame merges structural reinforcement with the outer frame in a integrated assembly.
2Shape
If conventional glass shelves use over-molded or adhesive-based constructions, then aesthetic appeal is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the shelf into a glass panel and a plastic frame assembly, the patent allows each component to be manufactured using cost-effective processes. The plastic frame can be injection molded as separate pieces (outer frame and inner frame) that are then assembled, avoiding expensive over-molding or adhesive operations while maintaining aesthetic appeal.
Solution Approach 2:
The patent applies local quality by providing the aesthetic finish only where needed (on the glass shelf panel surface) while using functional plastic components for structural support. The inner reinforcing frame provides structural reinforcement locally at key areas without requiring aesthetic finish, optimizing both cost and performance.
3Ease of operation
If wire-frame shelves are directly attached to the refrigerator liner, then installation is simplified, but loading capacity is reduced
Solution Approach 1:
The patent uses a nested structure where the inner reinforcing frame is inserted into channels of the outer frame. This nested arrangement provides internal reinforcement without increasing the external dimensions or complicating the attachment mechanism. The inner frame nestles within the outer frame's support channels, strengthening the assembly while maintaining simple attachment to the refrigerator liner.
Solution Approach 2:
The patent creates a composite structure combining the glass shelf panel with the plastic frame assembly. The plastic frame itself is a composite of the outer frame and inner reinforcing frame working together. This composite construction provides enhanced loading capacity compared to simple wire-frame shelves while maintaining relatively simple installation through the attachment studs.
4Strength
If a reinforcing support frame is added to the shelf, then loading capacity is improved, but structural complexity increases
Solution Approach 1:
The inner reinforcing frame is nested within the outer frame by inserting it into support channels formed in the outer frame. This nesting approach provides reinforcement without requiring additional attachment points or complex joining mechanisms. The inner frame fits into the existing structure of the outer frame, adding strength while minimizing increases in overall structural complexity.
Solution Approach 2:
The support channels formed in the outer frame serve multiple functions: they provide structural reinforcement through the inner frame, facilitate assembly by guiding the inner frame into position, and contribute to the overall aesthetic appearance. This multi-functionality reduces the need for separate components, offsetting the added complexity with functional integration.
Data Source
AI summary
A shelf assembly includes a shelf frame adapted to support a planar shelf panel. The shelf frame comprises a front member, opposed side members, and a rear member. A support channel is integrally formed into an underside of the shelf frame. A reinforcing support frame is captured within the support channel to form a unitary shelf assembly and is adapted to support the shelf frame within said appliance. At least one stud projects outward from the reinforcing support frame with respect to the opposed side members of the shelf frame. The studs are adapted to be received within a corresponding recess of an interior wall of said appliance to thereby support the shelf assembly within said appliance.