Plastic Engine Locking Lips for Tub Spout Manufacturing
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Solution Overview
Problem
Conventional tub spouts and engines require labor-intensive and costly post-casting machining processes due to their metal composition, which involves drilling, milling, tapping, chamfering, and deburring, making the manufacturing process time-consuming and expensive.
Innovation Solution
The development of a plastic engine with waterway connection geometry and locking lips that can be easily installed into a spout shell, minimizing the need for post-casting machine processing by using a moldable plastic material that reduces zinc usage and simplifies the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal engines are used in tub spouts, then strength and durability are improved, but manufacturing complexity and cost increase due to required post-casting machining processes
Solution Approach 1:
The patent changes the material parameter from metal to plastic, which fundamentally alters the manufacturing process. Plastic engines can be molded directly without post-casting machining operations such as drilling, milling, tapping, chamfering, and deburring, thereby reducing manufacturing complexity while maintaining adequate strength for the application
Solution Approach 2:
The patent employs a plastic engine that is easier and cheaper to manufacture, accepting that plastic may have shorter service life compared to metal, but the reduced manufacturing cost and complexity compensate for this trade-off in the overall product economics
2Strength
If metal engines are used in tub spouts, then structural integrity is improved, but production time and cost increase due to labor-intensive machining
Solution Approach 1:
Changing from metal to plastic material allows direct molding production, eliminating multiple machining steps and significantly increasing production efficiency. The plastic engine maintains sufficient structural integrity for tub spout applications while enabling faster, less labor-intensive manufacturing
Solution Approach 2:
The patent replaces mechanical machining processes with a molding process. Instead of using cutting tools to remove material from metal blocks, the engine is formed by injecting molten plastic into molds, which is a more efficient and automated process
3Ease of manufacture
If plastic material is used for the engine, then manufacturing cost and time are reduced, but locking mechanism reliability may be affected
Solution Approach 1:
The patent applies local quality by designing specific locking lips on the plastic engine that are optimized for their locking function. The plastic material is molded with precise geometric features (locking lips) that engage with corresponding features in the spout body, providing reliable locking despite the material being less rigid than metal
Solution Approach 2:
The patent changes the material parameters of the locking mechanism from metal to plastic, and compensates for potential reliability issues by optimizing the geometric parameters of the locking lips during the molding process, ensuring proper fit and retention strength
Data Source
AI summary
A spout for a tub. The spout includes a spout shell having opposite first and second sides. The spout further includes an inlet portion extending from the first side. The spout further includes an outlet portion extending from the second side. The outlet portion includes an outlet bore that is in fluid communication with the inlet portion. The spout further includes a plastic engine configured with waterway connection geometry and one or more locking lips, where the plastic engine is installed in the spout shell through the annular inlet portion and is secured in place by the one or more locking lips prior to reaching the annular outlet portion.