Audio Plug Hard Shell Two-Shot Molding
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Solution Overview
Problem
Existing audio plugs with soft plastic covers are susceptible to damage and do not provide a cosmetically appealing appearance, as they can become soiled and fail to protect internal electrical connections effectively.
Innovation Solution
An audio plug with a hard outer shell made from materials like PCB ABS or Dow 5200 HF, which protects the electrical connection and provides a smooth, cosmetically appealing surface, is assembled using a two-shot molding process that includes an inner member and strain relief member, ensuring a secure and aesthetically enhanced design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a soft plastic cover is used on the audio plug, then the plug can be easily manufactured and assembled, but the cover becomes susceptible to damage and allows undesired access to internal electrical connections
Solution Approach 1:
The patent employs a two-shot molding process that creates a composite structure with an inner soft plastic member and an outer hard shell member. The inner member provides flexibility and ease of assembly, while the outer hard shell member provides durability and protection against damage and unauthorized access to electrical connections.
2Ease of manufacture
If a soft plastic cover is used on the audio plug, then the manufacturing process is simpler, but the cosmetic appearance deteriorates when soiled through normal use
Solution Approach 1:
The two-shot molding process creates a composite structure where the outer hard shell member provides a smooth, cosmetically appealing surface that resists soiling and maintains appearance through normal use, while the inner soft plastic member remains hidden and provides the manufacturing advantages of flexibility and ease of assembly.
3Reliability
If a hard shell is used on the audio plug, then the protection and cosmetic appearance are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The two-shot molding process performs the assembly of the inner and outer members in a single integrated manufacturing step. The first material is molded, then the second material is molded over it in the same fixture, eliminating the need for separate assembly operations and reducing manufacturing complexity despite the multi-material construction.
4Device complexity
If a hard shell is used on the audio plug, then the cosmetic appearance is enhanced with a smooth surface, but the manufacturing complexity increases
Solution Approach 1:
The two-shot molding process creates the smooth, cosmetically appealing outer surface and the inner structural member in a single integrated operation. The fixture is prepared with the plug and cable assembly, the first material is molded around it, then the second material is molded over the first, producing the finished cosmetic surface without requiring subsequent finishing operations.
Data Source
AI summary
Apparatus, systems and methods for assembling an audio plug with a cosmetic hard shell are provided. A plug may be coupled to a cable. An inner member may be molded about an end portion of the plug and an end portion of the cable. A strain relief member may be molded about a portion of the cable such that the strain relief member is adjacent to and substantially flush with the inner member. The seam between the inner member and the strain relief member may be covered by coupling a hard, smooth outer shell over a portion of the inner member and a portion of the strain relief member. Each of the inner member, the strain relief member, and the outer shell may be formed by injection molding, be of a cylindrical shape, and be formed from the same or different materials.