Electrical Junction Box Cover Structure for Easier Maintenance
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Solution Overview
Problem
Conventional electrical junction boxes require disengagement of multiple engaging parts for cover removal, complicating maintenance work.
Innovation Solution
The electrical junction box features a second cover fixed to the case body using a rotation fulcrum engaging part and an inter-cover engaging part, allowing for easy removal by elastic deformation of lock arms and displacement of engaging frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple engaging parts are used to fix covers to the case body, then the fixation reliability is improved, but the ease of operation deteriorates due to complicated removal procedures
Solution Approach 1:
The engaging mechanism is divided into two functional parts: a rotation fulcrum engaging part for secure attachment and an inter-cover engaging part for cover-to-cover connection. This segmentation allows the system to maintain reliable fixation while enabling easier removal through a simplified disengagement process.
Solution Approach 2:
The lock arm is designed as a deformable component that can elastically change its shape. During removal, the lock arm is pressed to deform and disengage from the lock arm receiving part, transforming the static engaging mechanism into a dynamic one that facilitates easy cover removal while maintaining secure fixation during normal operation.
2Strength
If multiple engaging parts are used to fix covers, then the fixation strength is improved, but the device complexity increases
Solution Approach 1:
The rotation fulcrum engaging part and inter-cover engaging part are integrated into a unified engaging mechanism system. The lock arm serves dual functions as both the engaging element for the rotation fulcrum and the inter-cover locking element, reducing the number of separate components while maintaining strong fixation.
Solution Approach 2:
The lock arm is designed to perform multiple functions: it engages with the rotation fulcrum engaging part for secure attachment to the case body, and simultaneously engages with the lock arm receiving part for inter-cover fixation. This multi-functionality reduces component count and simplifies the overall device structure while maintaining strong fixation strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy removal and fixation of covers, improving maintainability and potentially downsizing the junction box.
Implementation Method 1
the lock arm (61) is pressed so as to be elastically deformed in a direction in which the lock arm (61) is disengaged from the lock arm receiving part (62)
Data Source
AI summary
An electrical junction box includes a case body on which a first opening and a second opening are formed, a first cover configured to be fixed to the case body such that the first cover covers the first opening, and a second cover configured to be fixed to the case body such that the second cover covers the second opening. The second cover is fixed to the case body by a first rotation fulcrum engaging part and an inter-cover engaging part. The first rotation fulcrum engaging part includes an engaging protrusion formed on one end of the case body, and an engaging frame formed on one end of the second cover and configured to be engaged with the engaging protrusion. The inter-cover engaging part includes a lock arm formed on another end of the second cover, and a lock arm receiving part formed on the first cover.