I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

The trigger is to release the sear by pulling the trigger to cause the firing pin or hammer to fire the ammunition.

The concept is very simple, but after thinking about it for a long time, Liu Tan didn't know how to explain to these people what is a sear, what is a firing pin or a hammer.

And this is the trigger of a firearm. In fact, the trigger used on a crossbow does not have a firing pin or a hammer. Maybe it can be called a crossbow instead of a trigger.

After all, it is called a crossbow machine on the crossbow.

Liu Tan thought for a while and said: "It is to change the form of this crossbow machine. Now whether it is winding or firing, it depends on waist strength, but in the same way, we can change the form and try it with our fingers?"

The expression on Gongshu Yi's face seemed to be enlightened, but he didn't understand it for a while.

Liu Tan had no choice but to ask someone to bring a pen and paper over, draw the general shape of the trigger according to his own impression and said, "Can you see it clearly?"

Gongshu was also dumbfounded, Liu Tan's way of drawing pictures was so different from the way Gongshu's family drew pictures, that he didn't know how to interpret them for a while.

Seeing him like this, Liu Tan asked someone to bring in things like a sitting scale and a desk table, and explained to him while referring to the crossbow: "First of all, here, I call it the string clamping device, the name is understandable, right? "

Gongshu also nodded frantically, and the other Gongshu's people he brought also ran behind them to watch.

Liu Tan said: "This drawing of mine is just a brief indication. Generally, there are several types of string clamping devices. One is the circular trigger. The circular trigger is divided into a small circular trigger and a large circular trigger. The small circular trigger is more complicated. The notched disc here is the tooth, the upper notch is used as the clamping place, and the lower part is linked by two bearings. The bottom part is the trigger. When the trigger is pulled, the bearing will drive the disc to loosen the string, so that the bow and arrow will be shot out. .”

Gongshu Lang asked curiously: "Then what is the big circle trigger?"

Liu Tan thought for a while and drew it casually and said: "The big circle trigger actually doesn't look round. It is composed of two triangles with a bayonet. The upper one is used as a tooth to hold the string, and the lower one is protruding. The place is stuck by the trigger, you see, the trigger is basically T-shaped, when the trigger is pulled, the big triangle on it will sink and the arrow will shoot out."

Gongshu also looked at it for a while and said: "Whether it is a small-circle trigger or a large-circumference trigger, it is actually not difficult to make it, but the difficulty lies in how to ensure that the trigger will not be deformed due to the strength of the string after winding, or that it will not appear. The situation where the string can’t get stuck happens.”

Liu Tan pondered, when he was drawing the structure diagram just now, he also felt that something was wrong, but no matter how he thought about it, he didn't find anything wrong. Now that Gongshu also pointed it out, he realized that something was indeed wrong.

He casually drew a schematic diagram of the force. Of course, he can't guarantee that the force he understands is correct. After all, the physics thing has basically been returned to the teacher. If it wasn't for the installation of the water tank when making the toilet before , Let him re-understand simple mechanics through experiments.

He might not even be able to draw this thing now.

Originally, Liu Tanhua's schematic diagram was somewhat incomprehensible to several public losers. If he didn't explain it, and expected these people to understand it, it would probably take a long time.

Now that he finished drawing the force analysis, he couldn't understand it even more. Gongshu couldn't bear the pressure and looked up at Gongshulang and the others, asking with his eyes: Do you understand?

However, he saw that the expressions of his younger brothers were more and more bewildered. The only one was Gongshuzuo who was nearly ten years younger than him. At this time, Gongshuzuo's face was very flat. Then I heard Gongshu Zuo say in a very low voice: "What's all this?"

Gongshu also: ...

He also didn't expect that the younger brother's frankness was because he didn't understand at all, ignorant frankness.

The public loser is also a little tangled, ask it, it seems that a person who is a bit lost in the public loser, don't ask, he really doesn't understand.

When he was struggling, he suddenly heard the King of the North say: "Oh, I know, the small circle trigger needs a resistance in the front and a resistance in the back when it is wound, so as to avoid the string from being stuck. "

Finally, Gongshu couldn't help but asked: "Resistance... is it something that blocks it? But if it is set, wouldn't the disk be fixed there?"

Liu Tan sighed and said, "So this needs a spring."

Gongshu was also completely dumbfounded: what is a spring?

Fortunately, this time Liu Tan didn't ask them if they understood, but turned to Miao Rui and said, "Go get a piece of copper wire."

Although iron wire is the most suitable, there seems to be no iron wire in his warehouse. There are many things like copper wire because of their many uses.

Miao Rui was quickly fetched, and Liu Tan took a brush, and quickly wound the copper wire around the brush in a spiral shape.

After the winding was completed, he directly pulled out the dagger at his waist and cut it off, then took off the spiral copper wire, flattened both ends, then put it on the ground and stretched out his finger to press it. At the same time, after Liu Tan's hand was released, it returned to its original appearance.

However, the elasticity of this copper wire may not be very good, so it has not fully recovered.

Anyway, Liu Tan was just signaling, looked up at Gongshu and asked, "Do you understand?"

However, Gong Shuyi stared at it without blinking as if he saw some treasure in the world, and did not respond to Liu Tan at all.

Liu Tan looked up and looked around, and found that except for one person whose face was full of bewilderment, the faces of several other people seemed to be caught in some strange fantasy, and their expressions were very, very difficult to look directly at.

Liu Tan couldn't help but tap Gongshuyi on the head with a brush and asked, "What are you thinking? Do you understand?"

Gongshu also came back to his senses, instead of answering the question, he asked: "Your Highness, is this a spring? Where did it appear? Why have I never seen it before?"

Liu Tanxin said that you asked me, who should I ask?I don't study history and I don't study these things.

He glanced at Gongshuyi and didn't say anything, but asked: "You can see the benefits of this thing by looking at you, so you understand what I just said?"

Gongshu also nodded frantically: "Understood, I understand, as long as this... what is it called? A spring? As long as this spring is hard enough and can be squeezed, then it can be guaranteed that the trigger will not get stuck when winding. It also guarantees that it will fire when the trigger is pulled."

Liu Tan was very pleased and said, "Not bad."

It's easy to talk to professionals, and he doesn't need to explain too much, just give a rough idea. In this comparison, the craftsmen under him are really worse than the public losers.

Gongshu also immediately said: "We will start researching when we get back, but...we have never done this before, please give us more time, Your Highness."

Liu Tan waved his hand: "There's no rush, as long as we get it out before Tongda City is built."

Originally, he wanted to say that it would be fine as long as it was established before the opening of the mutual market, but after thinking about it, he always wanted to give his soldiers a chance to practice.

These soldiers may have never even used crossbows before, let alone hand crossbows.

Gongshu also got up, looked eagerly at the pictures drawn by Liu Tan on the desk and said, "Caomin... Caomin has a heartfelt request."

The moment Liu Tan heard this sentence, a sentence flashed in his mind: Since you know it's an unkind invitation, don't invite it.

But he also knew that the other party was being polite, and seeing Gong Shuyi's expression, he knew what the other party wanted to do, so he simply asked, "Do you want these pictures? Take them, but remember to keep them carefully."

Gongshu also immediately said: "The grassroots know that if the plan is there, the plan will be ashamed and perish."

Liu Tan: ...

It didn't have to be like this, if he didn't explain the things he drew, people from Gongshu's family would not be able to understand them, and the Mohists probably weren't very good either.

It is even more incomprehensible to others, even if the master is among the people, no matter how skilled they are, they can't understand the force analysis.

In fact, he didn't explain the force analysis to Gongshuyi. Whether he can figure it out is up to Gongshuyi himself.

Gongshuyi and the others left holding Liu Tan's picture and the spring he made casually like rare treasures.

After Liu Tan heard that they went back, he retreated directly, entrusted others to deliver meals every day, and began to study triggers and hand crossbows in retreat by himself.

He always felt very familiar with this set of procedures, and after thinking about it carefully, he couldn't help but suddenly realized—isn't this the style of Kai Guan back then?

From this point of view, it is true that those who achieve great things must have the quality of calm and hard work, among other things.

Liu Tan originally thought that Gongshu and the others were so serious that he would be able to see the new hand crossbow soon, so he endured for a long time before telling Wei Deng that they would soon have new equipment.

Fortunately, there was no notice. The trigger problem was because Liu Tan used this cheat to save Gongshuyi and the others from taking a lot of detours, but soon there will be a very serious problem that they can't solve-the problem of falling arrows and arrows jumping over the bowstring. .

What Gongshuyi and the others wanted was to improve the arrow, because the problem lies in the arrow.

But the problem is that the arrows have been changed a lot because of the special nature of the crossbow. Now the arrows used on the crossbow don't even have arrow feathers. How do they change it?

Gongshu also immersed himself in research for a long time, and decided: "Let's go, let's ask His Highness."

So Liu Tan saw the semi-finished product they made. After hearing about Gongshuyi's problem, he frowned and said, "Why do you have to deal with arrows? Can't you add a pressing piece on the crossbow? It is specially used to Arrow blades that suppress arrows?"

While talking, he casually made a gesture with a paper knife, and Gongshu suddenly realized: "So that's it, the crossbow needs to be adjusted when the arrow jumps?"

Liu Tan said casually, "It's good to install an arrow-receiving weapon."

Gongshu was also stunned for a moment: "What is the arrow-receiving device?"

Just as Liu Tan was about to explain, he suddenly came to his senses, threw the brush on the desk and asked, "Is your surname Gongshu or mine? Which one of us came from an official family?"