Door and baffle interface assembly for frozen dessert machines
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Solution Overview
Problem
The metal-to-plastic threaded interface between the cantilevered baffle and the freezer door in frozen dessert machines experiences high field failure rates due to stress from daily heat treatment cycles, leading to mechanical degradation and increased maintenance costs.
Innovation Solution
A novel mechanical interface assembly featuring a recessed mounting pocket with a cornice on the freezer door and a retention flange on the baffle, both made from self-lubricating thermoplastic materials, providing a plastic-to-plastic detachable connection that reduces stress and fatigue, enhancing durability and reducing failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal-to-plastic threaded interface is used to affix the baffle to the door, then the baffle can be securely attached, but the plastic door degrades over time due to stress from heat treatment cycles
Solution Approach 1:
The patent applies homogeneity by making both the baffle and door from the same plastic material (acetal resin), eliminating the metal-to-plastic interface that caused stress concentration and degradation. This material uniformity ensures compatible thermal expansion and stress distribution throughout the assembly during heat treatment cycles.
Solution Approach 2:
The patent changes the material parameter from metal to plastic for the baffle, transforming it into the same material as the door. This parameter change eliminates the incompatible thermal and mechanical properties that caused the threaded interface to fail under repeated heat treatment stress.
2Strength
If a threaded interface is used to connect the baffle and door, then the connection is mechanically strong, but the threaded interface fails under repeated thermal stress
Solution Approach 1:
The patent extracts the threaded interface entirely from the design, replacing it with a stress-free snap-fit connection. By removing the threads that concentrated stress during thermal cycling, the connection maintains strength without the reliability problems of threaded fasteners under thermal stress.
Solution Approach 2:
The patent segments the connection into distinct functional zones: a snap-fit engagement zone for mechanical attachment and a stress distribution zone that prevents concentration of forces. This segmentation allows the connection to handle thermal expansion and contraction without failing.
3Strength
If the baffle is made from stainless steel, then it provides structural strength, but it creates a incompatible interface with the plastic door under thermal cycling
Solution Approach 1:
The patent applies homogeneity by making both the baffle and door from the same plastic material (acetal resin), eliminating the metal-to-plastic interface that caused stress concentration and degradation. This material uniformity ensures compatible thermal expansion and stress distribution throughout the assembly during heat treatment cycles.
Solution Approach 2:
The patent changes the material parameter from metal to plastic for the baffle, transforming it into the same material as the door. This parameter change eliminates the incompatible thermal and mechanical properties that caused the threaded interface to fail under repeated heat treatment stress.
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 new interface significantly reduces field failure rates by eliminating stress on the plastic door, thereby increasing the operational reliability and longevity of frozen dessert machines while maintaining efficiency in pasteurization and product handling.
Implementation Method 1
both made from self-lubricating thermoplastic materials, providing a plastic-to-plastic detachable connection that reduces stress and fatigue
Data Source
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AI summary
An interface assembly for a frozen dessert machine is disclosed that includes a freezer door having opposed front and rear sides and including at least one recessed mounting pocket formed in the rear side thereof, the at least one recessed mounting pocket including a cornice covering an upper portion thereof, and at least one elongated baffle having opposed proximal and distal end portions, the proximal end portion of the at least one baffle including a retention flange that is dimensioned and configured for detachable reception within the at least one mounting pocket of the freezer door behind the cornice.