Tool-Operated Fastener Assembly for Electrical Junction Box Security
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Solution Overview
Problem
Existing fastener arrangements for securing a lid to a container, such as an electrical junction box, often lack security and can be accidentally opened or provide inadequate sealing due to their manual operation, which may not be strong enough to ensure secure closure.
Innovation Solution
A fastener assembly with a manually operated rotating mechanism that allows easy closure by hand but requires a tool for opening, featuring a tab for leverage during manual closure and a tool-operated mechanism that is inaccessible in the closed position, ensuring secure fastening and reducing accidental unfastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual rotating mechanism is used for fastening, then ease of operation is improved, but security deteriorates due to accidental opening
Solution Approach 1:
The rotating mechanism is segmented into two distinct parts: a manual rotating mechanism for easy closure operation, and a tool-operated mechanism for secure opening. This segmentation allows each part to serve its specific function optimally - the manual part provides ease of operation while the tool-operated part ensures security against accidental opening.
Solution Approach 2:
A recess structure acts as an intermediary element that receives and protects the manual rotating mechanism when the fastener is in the closed position. This intermediary structure physically shields the manual mechanism from accidental engagement while still allowing intentional manual operation during the closing process.
2Ease of operation
If a manual rotating mechanism is made accessible for easy operation, then ease of operation is improved, but device complexity increases to prevent accidental opening
Solution Approach 1:
The manual rotating mechanism and the recess structure are merged into an integrated assembly where the recess is formed as part of the housing structure. This merging reduces overall device complexity by combining the protective function with the existing structural elements rather than adding separate protective components.
Solution Approach 2:
The recess structure provides localized protection specifically where the manual rotating mechanism is positioned, rather than requiring complex protective structures throughout the entire device. This local quality approach maintains simplicity by applying protection only where needed for accidental opening prevention.
3Reliability
If a tool-operated mechanism is added for security, then reliability is improved, but device complexity increases
Solution Approach 1:
The rotating fastener mechanism serves multiple functions: it can be manually rotated for easy closure, it can be tool-operated for secure opening, and the recess structure provides both structural support and protective shielding. This multi-functionality reduces the need for separate dedicated components, thereby minimizing overall device complexity while maintaining enhanced reliability.
4Reliability
If the manual rotating mechanism is protected by a recess, then security is improved, but ease of operation may be reduced
Solution Approach 1:
The recess structure dynamically adapts to the operational state: during intentional closing operations, the recess accommodates manual manipulation of the rotating mechanism; once closed, the recess automatically provides protective shielding. This dynamic behavior allows the structure to serve both accessibility during operation and protection during the closed state without compromising either function.
Data Source
AI summary
A fastener assembly for releaseably fastening a first body to a second body is disclosed. The fastener assembly has a manual rotating mechanism to permit closing of the fastener by hand. Once closed, the manual rotating mechanism is not easily accessible to the user by hand. A separate tool operating rotating mechanism is accessible by a tool when the fastening mechanism is in the closed position. The fastening mechanism can be used to fasten a lid to a box in which case the lid has a recess for receiving the manual rotating mechanism.