Resin Molded Connector with Flat Bend Surfaces

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Solution Overview

Problem

The existing methods for molding connector housings with conductive plates result in resin leakage due to distorted bends, leading to inefficiencies and reduced connection reliability, as the mold arrangement needs to be adjusted for each conductive plate, causing variations in bend width and excess metal parts to interfere with the molding process.

Innovation Solution

A resin molded product design where a metal member is bent with flat plates extending from both ends, allowing the mold to contact these flat surfaces for resin cutoff, preventing leakage and ensuring flush inner peripheral edges, which maintains consistent width and reduces assembly inefficiencies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the conductive plate is made thicker to improve strength, then the bending strength is improved, but the side parts of the bend become distorted causing resin leakage during molding

Engineering Contradiction:
Improvebending strengthVSAvoidmolding reliability
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-forming flat surfaces on the inner peripheral edges of the bend before the molding process. These flat surfaces are created during the bending process itself, ensuring that when the mold contacts the conductive plate during secondary molding, there is a precise contact surface that prevents resin leakage. This preliminary preparation of the surface geometry resolves the contradiction by maintaining both thickness for strength and precision for reliable molding.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If the side edges of the bent portion are shaped to be flat to prevent resin leakage, then molding reliability is improved, but the width of the bend varies requiring mold adjustment for each conductive plate

Engineering Contradiction:
Improvemolding reliabilityVSAvoidmolding efficiency
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent applies local quality by creating flat surfaces only at the specific location where mold contact is needed (the inner peripheral edges of the bend), rather than making the entire side edges flat. This localized approach ensures reliable mold contact and prevents resin leakage at the critical bonding interface, while maintaining the natural width variations elsewhere on the conductive plate. The flat surfaces are precisely positioned to provide consistent contact points for the mold, eliminating the need for mold adjustment while preserving molding efficiency.

Inventive Principle:
Principle #3Local quality

3Reliability

If the entire side edges or outer peripheral edges of the bend are made flat to prevent resin leakage, then molding reliability is improved, but the arrangement of the mold needs to be adjusted for each conductive plate reducing work efficiency

Engineering Contradiction:
Improvemolding reliabilityVSAvoidmold arrangement complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-forming flat surfaces on the inner peripheral edges of the bend during the bending process itself, before the secondary molding operation. These flat surfaces serve as predetermined contact surfaces that ensure reliable mold contact without requiring subsequent adjustments to the mold arrangement. By preparing the contact surfaces in advance as an integral part of the bending process, the patent eliminates the need for complex mold adjustments for each conductive plate, thereby maintaining high work efficiency while ensuring molding reliability.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentUS10916867B2Resin molded product
Publication Date: 2021.02.09 SUMITOMO WIRING SYSTEMS LTD
  • US10916867B2 patent drawing
  • US10916867B2 patent drawing
  • US10916867B2 patent drawing

AI summary

A resin molded product has a terminal body (10) in which plate-like terminals (20) and a housing (40) made of synthetic resin are integrally fixed. Each terminal (20) includes a bend (22), terminal bodies (21) and wire-side connecting portions (23) continuous with both ends of the terminals (20). Molded portions (62) embed parts of the terminal bodies (21) and the wire-side connecting portions (23) together with inner curved surfaces (30) of the bends (22). Flat side surfaces (25) of the terminal bodies (21) and flat side surfaces (27) of the wire-side connecting portions (23) are exposed from and adjacent to the molded portions (62) on both sides of the terminal bodies (21) and both sides of the wire-side connecting portions (23), and flat surfaces (32) are exposed from the molded portions (62) on both side surfaces (22A) of the bend (22).