Interdental Cleaning Tool Core Base Recesses

The patent applies local quality by forming recesses at specific locations on the core base portion where holding pins contact during molding. These recesses are strategically positioned to reduce stress concentration at critical points without altering the overall material composition or adding glass fibers throughout the entire structure.

The recesses are formed in advance during the molding process by the holding pins, preparing the core base portion structure before use. This preliminary action creates stress-distributing features that prevent breakage during subsequent insertion and cleaning operations without requiring additional manufacturing steps.

The patent changes the structural parameters of the core base portion by forming recesses at specific locations, rather than changing the material parameters to use expensive super engineering plastics. This structural modification achieves the same durability improvement while maintaining standard molding temperatures and cycle times.

Instead of using expensive super engineering plastics that require specialized molding processes, the patent uses conventional synthetic resin materials combined with a simple structural feature (recesses) that can be formed during standard molding, effectively replacing costly materials with a cheaper structural solution.

The patent applies local quality by creating recesses at the holding pin contact points on the core base portion. These recesses are specifically positioned where the holding pins make contact during molding, providing localized stress relief without affecting the overall positioning precision achieved by the pin arrangement.

The patent converts the harmful stress concentration effect of holding pin contact into a beneficial feature by forming recesses at the contact points. The same holding pins that provide precise positioning also create the recesses that prevent breakage, turning a potential weakness into a strength.