Anti-theft cast iron well lid

By designing a purely mechanical self-locking structure on cast iron manhole covers, and utilizing a ring-shaped locking point array and fine-threaded connections, the problem of easy theft of traditional cast iron manhole covers has been solved, achieving a highly efficient anti-theft effect and ensuring public safety.

CN224378957UActive Publication Date: 2026-06-19ZHUJI XINGUANG MUNICIPAL FACILITIES CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHUJI XINGUANG MUNICIPAL FACILITIES CO LTD
Filing Date
2025-06-23
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

Traditional cast iron manhole covers are easily stolen, leading to damage to public facilities, increased maintenance costs, and even safety hazards.

⚗Method used

An anti-theft cast iron manhole cover was designed, which adopts a purely mechanical self-locking structure. The second connecting rod engages with the locking grooves on multiple rotating wheels to form a ring-shaped locking point array. Combined with the fine-threaded connection between the connecting column and the plug rod, it achieves irreversible locking and prevents technical unlocking.

🎯Benefits of technology

It significantly improves the anti-theft performance of manhole covers, avoids the risk of electromagnetic interference cracking, adapts to various complex environments, and ensures public safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses an anti-theft cast iron manhole cover, belonging to the field of manhole cover technology. It includes a base, with a cast iron manhole cover rotatably connected inside the base. A connecting shell is fixedly connected to the outer surface of the base, and a safety lock assembly is provided inside the connecting shell. The safety lock assembly connects the base and the cast iron manhole cover. Through a second connecting rod, it simultaneously engages with the locking grooves on multiple rotating wheels, forming a ring-shaped locking point array. Even if a single locking point is damaged, the other locking points remain locked, preventing the manhole cover from being pried open from a single point, significantly improving the anti-theft level. It adopts a purely mechanical self-locking structure, requiring no power supply or electronic components, avoiding the risk of electromagnetic interference and adapting to various complex environments. The connecting column and the plug-in rod are connected with fine-threaded connections. Rotating more than one revolution without a matching tool triggers the self-locking mechanism, causing the safety lock assembly to enter an irreversible locked state, effectively preventing technical unlocking and thus improving public safety.
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