Overmolded Thermoplastic Refrigerator Handle for Secure Stud Mounting
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Solution Overview
Problem
Conventional handle attachment methods for refrigeration appliances, particularly gas assist thermoplastic handles, face challenges in providing a secure and aesthetically compatible attachment solution that does not require multiple components or compromise the sleek design.
Innovation Solution
A thermoplastic handle with tubular metal inserts overmolded into the mounting feet, featuring a setscrew aperture for secure attachment to appliance studs, ensuring a strong and reliable connection while maintaining the handle's aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional slide-on attachment mechanisms with brackets and engaging members are used, then the handle can be securely attached to the refrigerator door, but the attachment footprint becomes large and the design becomes complex with numerous components
Solution Approach 1:
The patent combines the attachment function directly into the handle body by integrating mounting feet with recesses that receive studs, eliminating the need for separate brackets and engaging members. This merging of functions reduces the number of components while maintaining secure attachment.
Solution Approach 2:
The handle body serves multiple functions: it provides the gripping function of a handle while also incorporating integrated mounting feet with recesses that perform the attachment function. This multi-functionality eliminates the need for separate attachment components.
2Reliability
If fasteners (bolts, screws) are used directly through the front of the handle, then secure attachment is achieved, but caps or plugs are required to hide the through-holes which collect dirt and detract from aesthetics
Solution Approach 1:
Instead of fastening from the front and hiding holes with caps, the patent inverts the attachment approach by using recesses in the mounting feet that receive studs from the door, with set screw apertures positioned on the sides or back. This eliminates the need for visible caps while maintaining secure attachment.
Solution Approach 2:
The patent extracts the fastening function from the front face of the handle and relocates it to the mounting feet with recesses. The set screw apertures are positioned away from the visible front surface, eliminating the aesthetic problem of visible holes and caps.
3Reliability
If metal handles with pressed-in inserts are used, then attachment to door studs is achieved, but the paint deteriorates and inserts loosen over time
Solution Approach 1:
The patent uses composite construction with a thermoplastic handle body and integrated metal mounting feet with recesses. The metal inserts provide durable stud reception while the thermoplastic body provides corrosion resistance and paint compatibility, combining the advantages of both materials for long-term durability.
4Reliability
If overmolded aluminum sleeves are pressed into plastic handle shells, then attachment structure is provided, but multiple molding steps and components are required
Solution Approach 1:
The patent merges the mounting feet with the handle body in a single integrated structure. The thermoplastic handle body includes directly formed mounting feet with recesses, eliminating the need for separate overmolded sleeves and reducing molding steps to a single integrated process.
Data Source
AI summary
A door handle configured for mounting onto a surface of an appliance door, such as a refrigerator door, includes a thermoplastic molded body having a central grip section intermediate of a mounting foot provided at each opposite end of the body. Each mounting foot has a flat planar cross-sectional end face configured for mounting flush against the surface of the appliance. A tubular metal insert is overmolded in each mounting foot, with the insert having an open end generally flush with the mounting foot end face. The insert has an inner cross-sectional profile configured for engagement over a stud provided on the surface of the appliance with, for example, a setscrew inserted through a setscrew hole.