Manhole cover has been repeatedly stolen and anti-theft new tricks: add a combination lock

Like a safe, you can only open it if you know the password. Can you imagine such a manhole cover?

In June of this year, Zhu Fugui, a Xiangshan man, received a utility model patent issued by the State Intellectual Property Office.

Recently, Zhu Fugui reformed this patent to make the anti-theft function of the manhole cover more reliable, and applied for a patent again.
Open locks are easy to be smashed, but what about combination locks?

The inspiration of the safe makes him like a treasure

Cast iron manhole covers are frequented by thieves, manhole covers made of composite materials are easily crushed, and new ductile iron manhole covers are more expensive than composite materials ... This manhole cover is really the most troublesome detail of urban roads.

Zhu Fugui is 45 years old and sells construction materials full-time. Two years ago, watching TV talk about the frequent theft of manhole covers caused many casualties. Lao Zhu realized that there were a lot of articles in the manhole covers to do, and there were also business opportunities to find.

Since then, he has been thinking about how to prevent the manhole cover from sleeping every night. He got up at more than 5 am and squatted on the side of the road to study the manhole cover.

He found that manhole covers on the road required simple, practical and complete anti-theft functions. The composite material is not strong, it can only protect itself from theft, but it can not protect the underground facilities, nor can it guarantee personal safety; the manhole cover connected by iron chains and hinges cannot be integrated with the well ring, and it is easy to be pryed; It is also easy to be smashed ...

Can you solve this without changing the cover? After more than 20 days passed, the research still could not find a breakthrough.

One day, when opening the safe, Lao Zhu suddenly had inspiration: how about using a combination lock? He immediately went to the repair shop nearby and spent 80 yuan to buy a used safe lock.

When he got home, he took the lock away and studied what was going on in the safe. Knowing the principle of the safe, the next thing is much easier. Zhu Fugui simply drew a sketch on the paper, "Because there was no money at the time, and I was not sure, I found a piece of wood as a model. This model is not very precise, but as long as the principle can be explained and the analysis is clear.

No need to replace the original iron cover and add a combination lock

Like the lock of the safe, the lock of this manhole cover is also unscrewed. Zhu Fugui said: "As long as you know the password, you can open it within a minute, and it is effortless. Now I have added a component to it Even a thief who has the patience to study the password cannot remove the manhole cover! "

Considering that the environment in which the manhole cover is located is relatively easy to rust, Zhu Fugui said: "Some components that need to be moved are best produced using composite materials or stainless steel materials." Such manhole covers can be reworked, and the existing cast iron manhole covers can be used. For processing, it is only necessary to drill some small holes and add the components of the combination lock. "In this way, the cost is much lower and it is easier to promote."

During this time, Zhu Fugui received letters and telephones from manufacturers producing manhole covers all over the country every day. A Ningbo manhole cover manufacturer also expressed its intention to cooperate. Zhu Fugui hopes that the manhole cover he designed can be promoted all over the country. If there is a strong company to contact him, he also intends to transfer this patent.