Wall-Mounted Pull Box Security Cover to Deter Wire Theft
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Solution Overview
Problem
The rising cost of copper and ease of access to copper wire in pull boxes have made them a target for theft, leading to significant replacement costs, traffic delays, and safety risks when street/highway lighting is disrupted.
Innovation Solution
A novel wall-mounted pull box designed for new construction, featuring a sturdy steel construction, security cover with oval security nuts requiring a special tool for removal, and a decorative cover to conceal security features, making it difficult for thieves to access the wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a standard cover lid is used on the pull box, then the pull box can be easily installed and accessed, but the copper wires inside become vulnerable to theft
Solution Approach 1:
The patent applies preliminary anti-action by incorporating security features (security screws, security washers, or welding) into the cover lid design before installation. These features create preliminary resistance to theft attempts, requiring specialized tools or techniques that ordinary thieves would not possess, thereby preventing the harmful action of wire theft before it can occur.
Solution Approach 2:
The patent changes the parameters of the cover lid by transitioning from standard fasteners to security-enhanced fasteners. The cover lid is modified to include security screws with non-standard head configurations, security washers with broken edges, or welded attachments, fundamentally altering the removal characteristics from easily accessible to requiring specialized intervention.
2Reliability
If security features are added to the pull box cover, then wire theft is prevented, but the installation and maintenance complexity increases
Solution Approach 1:
The patent applies segmentation by separating the security feature from the main cover lid structure. The security elements (security screws, security washers, or welding points) are distinct, discrete components that can be independently installed and removed, allowing authorized personnel to work with modular security elements rather than redesigning the entire cover assembly.
Solution Approach 2:
The patent uses intermediary elements such as security washers positioned between the cover lid and the pull box flange. These intermediary security washers with broken edges serve as mediators that provide security functionality while maintaining a relatively simple overall structure, allowing the cover to be removed and reinstalled by authorized personnel with appropriate tools.
3Object-affected harmful factors
If the cover is made secure with specialized fasteners, then wire access is restricted, but legitimate maintenance access becomes more difficult
Solution Approach 1:
The patent applies self-service by designing the security features to be self-contained within the cover assembly. The security screws, security washers, or welded connections are integrated into the cover itself, allowing authorized maintenance personnel to remove the entire cover as a unit and then access the wires without needing to disassemble multiple separate security mechanisms during the maintenance process.
Data Source
AI summary
An electrical junction box (pull box) that is used for connecting electrical utilities to public fixtures such as streetlamps and stop lights and designed to be used in new construction with walls that can withstand the pressures and forces of having concrete poured around it. The pull box also includes improved security features including a security cover and a decorative cover. The security cover is secured to the pull box one or more oval shaped security nuts each fitted over a threaded post and locked down with a special security tool. The one or more threaded posts are secured to the pull box by novel high strength security brackets that are fitted to the rear of the pull box. The security nuts are fitted to the threaded posts in a recessed well that is covered by a threaded cover installed with a second special tool. Once the security cover is installed, a decorative cover is installed over the security cover typically with screws.