The trigger is pulled to release the sear, allowing the firing pin or hammer to fire the ammunition.
The concept is very simple, but Liu Tan thought for a long time and still didn't know how to explain to these people what a sear, a firing pin or a hammer is.
And this is the trigger of a firearm. In fact, the trigger used on a crossbow does not have a firing pin or hammer. Perhaps it can be called a crossbow instead of a trigger.
After all, it is called a crossbow mechanism on a treadle crossbow.
Liu Tan thought for a moment and said, "Let's change the mechanism of the crossbow. Currently, both the string and the firing of a foot-operated crossbow rely on waist strength, but we can try changing the mechanism and using our fingers."
Gongshu Yi's expression seemed to be confused. He seemed to be inspired, but he couldn't figure it out for a while.
Liu Tan had no choice but to ask for a pen and paper. He drew the general shape of the trigger according to his impression and said, "Do you understand?"
Gongshu was also confused. Liu Tan's way of drawing was so different from the Gongshu family's way of drawing that he didn't know how to interpret it for a moment.
Seeing him like this, Liu Tan immediately had someone bring over a scale and a table. While comparing the crossbow, he explained, "First, here's what I call the string-holding mechanism. Is that a good name?"
Gongshu Yi nodded frantically, and the other people from the Gongshu family he brought with him also ran behind them to watch.
Liu Tan said, "This drawing is just a rough sketch. There are generally several types of string-holding devices. One is a circular trigger, which is divided into small and large circular triggers. The small circular trigger is more complex. The notched disc here is the teeth. The notch on the top is where the string is held, and there are two bearings below. The bottom one is the trigger. When the trigger is pulled, the bearings drive the disc to release the string, and the arrow is released."
Gongshu Lang asked curiously, "What is a large circle trigger?"
Liu Tan thought for a moment, then sketched a picture. "A large circular trigger isn't actually round. It's made up of two triangles with bayonets. The upper one acts as a tooth, holding the string, while the lower protrusion is held in place by the trigger. You see, the trigger is basically a T-shape. When you pull the trigger, the upper triangle sinks, and the arrow is released."
Gongshu Yi looked at it for a while and said, "Whether it's a small or large circular trigger, it's actually not difficult to make. The difficulty lies in how to ensure that the trigger won't be deformed by the force of the string after it's wound, or that it won't get stuck in the string."
Liu Tan was deep in thought. Just now, when he was drawing the structural diagram, he felt that something seemed to be wrong, but no matter how hard he thought, he couldn't find anything wrong. Now that Gongshu Yi pointed it out, he realized that there was indeed something wrong.
He casually drew a diagram of the forces. Of course, he couldn't guarantee that his understanding of the forces was correct. After all, he had basically returned physics to his teacher. If it weren't for the fact that he had learned some physics from the water tank device when making the toilet before, and had to understand simple mechanics again through experiments.
He probably can't even draw this thing now.
Originally, several people from Gongshujia had difficulty understanding the schematic diagram drawn by Liu Tan. If he didn't explain it, it would probably take a long time for these people to understand it.
Now that he had finished drawing the force analysis, he couldn't understand it anymore. Gongshu Yi couldn't stand the pressure anymore and looked up at Gongshu Lang and the others, asking with his eyes: Do you understand?
However, he noticed that the expressions of his brothers were increasingly confused. The only one who looked so confused was Gongshu Zuo, who was nearly ten years younger than him. Gongshu Zuo's face was completely calm. Just when Gongshu Yi thought his brother understood, he heard Gongshu Zuo whisper, "What are these?"
Gongshu Yi: ...
He also didn't expect that his brother's calmness was because he couldn't understand it at all, and it was an ignorant calmness.
Gongshu Yi was a little confused. If he asked, it would seem a bit embarrassing for the Gongshu family. If he didn't ask, he really wouldn't understand.
Just as he was struggling, he suddenly heard the King of the North say, "Oh, I see. The small circular trigger needs resistance in the front and back when winding the string to prevent it from getting stuck."
Gongshu Yi finally couldn't help but ask, "Resistance... is it something that blocks something? But if it's set, wouldn't the disk be fixed there?"
Liu Tan sighed and said, "So this requires a spring."
Gongshu Yi was completely confused: What is a spring?
Fortunately, this time Liu Tan didn't ask them if they understood. Instead, he 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. Copper wire is quite useful because it has many uses.
Miao Rui quickly asked someone to bring it over. Liu Tan took a brush and quickly wrapped the copper wire around the brush in a spiral shape.
After the wrapping was completed, he pulled out the dagger from his waist and cut it off, then took out the spiral copper wire, flattened both ends, placed it on the ground and pressed it with his fingers. The copper wire shrank together at the moment of force, and returned to its original shape after Liu Tan released his hand.
However, the elasticity of this copper wire may not be very good, so it has not fully recovered.
Anyway, Liu Tan just gestured, looked up at Gongshu Yi and asked, "Do you understand?"
However, Gongshu Yi stared at it without blinking as if he had seen some treasure in the world, and did not respond to Liu Tan at all.
Liu Tan looked up and around, and found that except for one person with a confused look on his face, the faces of the other people seemed to be caught up in some strange fantasy, and their expressions were very, very difficult to look at.
Liu Tan couldn't help but tap Gongshu Yi on the head with his brush and asked, "What are you thinking about? Do you understand?"
Gongshu Yi came to his senses and, instead of answering the question, asked, "Your Highness, is this a spring? Where did it come from? Why have we never seen it before?"
Liu Tanxin said, "Who should I ask if you ask me? I'm not studying history, and I don't study these things."
He glanced at Gongshu Yi without saying anything, and simply asked, "From the look of you, you see the benefits of this thing. So, do you understand what I just said?"
Gongshu Yi nodded frantically. "I understand, I understand. As long as this... what's it called? A spring? As long as this spring is strong enough and can be squeezed, it can completely ensure that the trigger will not get stuck when the string is drawn, and it can also ensure that it can be fired when the trigger is pulled."
Liu Tan was very pleased and said, "Not bad."
It is easy to talk to professionals. He doesn't need to explain too much, just give a general idea. In comparison, the craftsmen under him are indeed inferior to those of Gongshujia.
Gongshu Yi immediately said, "We'll start researching it when we get back, but... we've never done this before, so please give us some more time, Your Highness."
Liu Tan waved his hand and said, "No rush, as long as we can get it done before Tongda City is built."
Originally, he wanted to just build it before the opening of the trade, but then he thought that he had to give his soldiers a chance to practice.
These soldiers may not have even used a tread crossbow before, let alone a hand crossbow.
Gongshu Yi stood up, looked eagerly at the pictures drawn by Liu Tan on the desk, and said, "I...I have a humble request."
The moment Liu Tan heard this, a sentence flashed through his mind: Since you know it is an unreasonable request, don't ask for it.
However, he also knew that the other party was just being polite, and looking at Gongshu Yi's expression, he knew what he was going to do, so he simply asked, "Do you want these pictures? Take them, but remember to keep them carefully."
Gongshu Yi immediately said, "I know that if the map survives, the people will live, but if the map is lost, the people will die."
Liu Tan: ...
That's not necessary. If he doesn't explain what he drew, no one in the Gongshu family would understand it, and I guess the Mohist school wouldn't be able to understand it either.
It would be even more difficult for others to understand it. Even if there are experts among the common people, no matter how expert they are, they would not understand the force analysis.
In fact, he did not explain the force analysis to Gongshu Yi. Whether Gongshu Yi could understand it depended on himself.
Gongshu Yi and a few others carried Liu Tan's map and the spring he made casually away as if they were rare treasures.
After hearing about their return, Liu Tan went into seclusion and asked others to deliver meals to him every day. He then began to study triggers and crossbows.
He felt that this set of procedures sounded particularly familiar. After thinking about it carefully, he suddenly realized - isn't this the style of Wei Guan back then?
From this perspective, it is true that those who achieve great things must, among other things, possess the qualities of calmness and diligent study.
Liu Tan originally thought that Gongshu Yi and the others were so serious that he would be able to see the new crossbows soon. He held back for a long time before he could restrain himself and told Wei Deng that they would soon have new equipment.
Fortunately, there was no preview. Because of Liu Tan's cheat, Gongshu Yi and his team avoided many detours in solving the trigger problem. However, they soon encountered a very serious problem that they could not solve - the problem of arrows falling and arrows jumping over the bowstring.
Gongshu Yi and his men wanted to improve the arrows because the problem lay with them.
But the problem is that arrows have been modified a lot due to the special nature of crossbows. Now the arrows used in crossbows don’t even have feathers. How else can they modify them?
Gongshu Yi studied it for a long time before deciding, "Let's go ask His Highness."
Liu Tan then saw their half-finished product. After hearing Gongshu Yi's dilemma, he frowned and said, "Why are you trying to pick on arrows? Can't you just add a pressure plate to the crossbow? Something specifically to hold down the arrow?"
As he spoke, he casually used a paper cutter to make a gesture, and Gongshu Yi suddenly understood: "So that's how it is. Does the crossbow also need to be adjusted when the arrow jumps the string?"
Liu Tan said casually, "Let's install an arrow deflector."
Gongshu Yi was stunned for a moment: "What is an arrow-repelling device?"
Liu Tan was about to explain when he suddenly realized what was happening. He threw his brush onto the desk and asked, "Is your last name Gongshu or mine? Which of us comes from a family of government officials?"
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