Vertical Electrical Junction Box Mounting Bracket
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Solution Overview
Problem
Existing electrical junction box mounting structures face issues with poor workability due to the need for bolting operations in limited spaces and vulnerability to loosening and water intrusion from vibrations, which can cause the mating faces of the case members to detach.
Innovation Solution
A mounting structure that uses a bracket with a backside plate and case hook parts to lock the under and upper case members vertically, eliminating the need for bolting and ensuring the mating faces remain secure by restricting movement, thus preventing detachment and water intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolting operation is used to fix the electrical junction box to the mounting panel, then the mounting reliability is improved, but the mounting workability deteriorates due to poor accessibility in limited installation spaces
Solution Approach 1:
A bracket is introduced as an intermediary component between the electrical junction box and the mounting panel. The bracket includes a backside plate fixed to the mounting panel and case hook parts that engage with locking projections on the case members. This intermediary structure enables secure mounting without requiring direct bolting of the junction box to the panel, improving accessibility in limited spaces while maintaining mounting reliability
Solution Approach 2:
The mounting structure is segmented into distinct functional components: the bracket (with backside plate and case hook parts), the locking projections on case members, and the electrical junction box. This segmentation allows the bracket to perform the bolting function separately, enabling workers to install the bracket first and then simply slide and lock the junction box into place, thereby improving mounting workability while maintaining reliability
2Volume of moving object
If the electrical junction box is vertically mounted with mating faces in the vertical direction to save installation space, then the installation space requirement is reduced, but the resistance to loosening and water intrusion deteriorates due to vibration
Solution Approach 1:
The mounting structure uses a composite approach combining multiple locking mechanisms: the bracket with backside plate and case hook parts, locking projections on case members, and interlocking features between upper and under case members. This composite locking system provides multi-directional constraint that prevents loosening and water intrusion even in vertical mounting configuration, maintaining reliability while achieving space savings
Solution Approach 2:
The bracket and locking projections are designed to preemptively counteract the loosening force generated by vibrations. The case hook parts engage with locking projections to create a pre-loaded locking condition that resists the opening direction forces caused by vibration, preventing water intrusion before it can occur
3Reliability
If locking pieces are provided on case members to prevent loosening, then the resistance to vibration-induced loosening is improved, but the device complexity increases
Solution Approach 1:
The locking function is merged into the bracket structure itself through the case hook parts that engage with locking projections on the case members. Rather than adding separate locking mechanisms to each case member, the bracket integrates the locking feature, providing vibration resistance while minimizing structural complexity. The locking projections are simply formed on the case members to interface with the bracket's case hook parts
Data Source
AI summary
In a mounting structure of an electrical junction box, the electrical junction box is vertically mounted on a wall surface along a vertical direction in a state where mating faces of an under case member and an upper case member are set in the vertical direction. Each of the under case member and the upper case member has a pair of left and right locking projections provided therein. A bracket including a backside plate part and a pair of case hook parts provided upright from both sides of the backside plate part is disposed along the vertical direction on the wall surface. The electrical junction box is slidingly inserted from above along the backside plate part in the vertical direction until both pairs of locking projections of the under case member and the upper case member are locked to the pair of case hook parts. Thus, the electrical junction box is mounted on the wall surface by use of the bracket.