The Structure And Unlocking Principle Of Flat Lock

Locks and unlocking are a pair of contradictions. Since the invention of locks, there have been many types. There are still more advanced flat locks and fingerprint locks invented. Let me introduce to you the most common basic type of pin tumbler locks:

Let's first introduce a few flat-lock terms:

1. Lock core: Copper cylindrical lock core, which can be locked or opened when turned. The lock cylinder is divided into an inner lock cylinder and an outer lock cylinder. The inner lock cylinder is where you insert the key.

2. Pins: Copper pins are divided into inner pins and outer pins. They are cylindrical and of different lengths. They are installed in the round holes of the inner and outer lock cores. A lock generally has 3-5 groups of marbles.

3. Spring: installed in the round hole of the outer lock core. Hold the marble.

4. Lock tongue: the part that expands and contracts when unlocking. When the cylindrical inner lock core rotates, it drives the lock tongue. The padlock is the "nose" that drives the lock.

5. Key: Needless to say, there are "saw teeth" of different heights corresponding to marbles of different lengths.

The structure and principle of (mechanical) pin-pin locks are very simple. What I want to say here is that almost all pin locks, such as one-word locks, cross locks, side (column) bolt type gold dot atomic locks, idle type ( Crescent) key locks, etc.) lock cylinders are all "top-top pin-type opening" (abbreviation: top-top type opening) and there is a "straight cylinder space" (or a slightly curved cylinder space)...

Top-top opening method: The lock opener uses a key or special tool to push all the marbles into the uppermost end, with the help of torque and the step surface between the marble holes of the inner and outer lock cylinder, under the action of the spring force, the inner lock is opened. The pins fall back and the outer pins block the inner lock core, thereby opening the lock. For the high-end anti-theft pin locks currently on the market, although their structures are different, their technical opening methods and tools are also different, but because they are all "top-type openings", their basic principles are the same.

Why can one key only open one flat lock?

Copper cylindrical lock core, which can be locked or opened when turned. I think what you want to know is how the lock cylinder corresponds to different keys. Insert the key into the lock cylinder. The "teeth" of different heights on the key correspond to the copper marbles of different lengths inside. Their length is just such that the other end of the inner pin is flush with the hole in the inner lock cylinder, which means that when another key is inserted, some of the inner pins will be exposed or recessed due to the different shapes of the "teeth"! As long as one is exposed or recessed, the inner lock cylinder will be stuck and unable to rotate. Can't open the lock. Different lengths and combinations of marbles correspond to different keys. That is, one key can only open one flatlock.

Since flat locks are manufactured in batches, different marbles, and combinations are limited, so mass-produced locks have a probability of duplication, that is, sometimes, one key can open two locks. This probability depends on the number of marbles and the number of combinations.

Knowing the above principles, when purchasing a pin lock (anti-theft pin lock), you should first observe the keyhole to prevent counterfeit and shoddy products from lacking pins. You can use a fine needle to pull and press to observe or twitch the key to listen to the sound (generally, ordinary pin locks have 4 to 5 groups of pinball), especially the tooth shape of the key. A pinball lock with shallow teeth at the front end and a large difference in depth at the back end has better performance in preventing low-level theft. Please note: it cannot be prevented! It's just that the performance is much better.