Junction Box Guide Sleeve Plastic Housing Rotation
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Solution Overview
Problem
Existing junction box designs face challenges in cost-effectiveness and material selection, as they often require expensive tools for production and limit the choice of materials for plastic housings and guide sleeves, and metal guide sleeves are costly.
Innovation Solution
The guide sleeves are made as individual plastic parts and fixed within a plastic housing using a press-fit or alternative attachment methods, allowing for different material selection and preventing rotation with radial lugs and slots, and internal threading for secure electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If guide sleeves are made as separate metal parts and fixed within the plastic housing, then the guide sleeves provide structural support and alignment, but the cost of manufacturing increases
Solution Approach 1:
The patent changes the material parameter of the guide sleeve from metal to plastic, which reduces manufacturing cost while maintaining the structural support and alignment functions. The plastic guide sleeve is fixed within the plastic housing using press-fit or adhesive bonding, providing the necessary mechanical strength and positional stability without the high cost of metal components.
2Ease of manufacture
If the plastic housing and guide sleeves are made from the same material, then manufacturing is simplified, but the ability to meet specific requirements for each component is limited
Solution Approach 1:
The patent applies local quality by allowing different plastic materials to be used for the housing and guide sleeves based on their specific functional requirements. The guide sleeve can be made from a plastic material optimized for its specific function (such as abrasion resistance or dimensional stability), while the housing uses a plastic material optimized for its requirements (such as impact resistance or cost). This is achieved through separate manufacturing processes that can select different materials for each component.
3Manufacturing precision
If expensive tools are used to manufacture the plastic housing with integrally molded guide sleeves, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the guide sleeve from the housing, manufacturing them as separate components that are then assembled together. This eliminates the need for expensive integral molding tools while maintaining precise positioning through the separate fixing process (press-fit or adhesive bonding). The segmentation allows each component to be manufactured using standard, cost-effective tools and processes.
Data Source
AI summary
A junction box assembly includes a support board, a connector supported at one end by the support board, a separate tubular guide sleeve arranged concentrically about the connector, and a cover having an open bottom chamber receiving the connector, and a top wall containing an opening receiving the upper ends of the guide sleeve and the connector, thereby to afford electrical connection to the connector by an associated second connector. The guide sleeve is restrained against rotation relative to the cover, the upper end of the guide sleeve being internally threaded for connection with the externally threaded lock nut on the second connector. The guide sleeve and the cover are formed from different synthetic plastic materials.