Structure Of Pin Tumbler Lock

- Jun 16, 2018 -

Pin Tumbler Lock, also known as pearl lock, bead lock, lock bolt or pin lock, is one of the most common lock structures. The principle is to use several cylindrical parts with different heights (called lock springs, billiards or beads) to lock the lock core. When the correct key is put and the lock springs are pushed to the same height, the lock core is released.


In 1848, American Yale Lin Nash invented a cylindrical lock with a pin pin. At present, this kind of structure is widely used in all kinds of locks in the world. The structure of modern marble lock has new development. There are many kinds of structures, such as two-way, three direction, four direction, double, double, double, double side, multi row and multifaceted bullet, which can greatly improve the security of the lock, and make the number of the lock "to" from the original 2500. There are millions of changes in the "face".


一, structure:


1. lock core: the copper cylinder lock core can be locked or opened when rotating. The lock core is divided into inner lock core and outer lock core, and the inner lock core is the place where you insert keys.


2. billiard: Copper billiard is divided into inner marble and outer marble, and the cylinder is different in length and length. It is installed in the round hole of the inside and outside lock core. A lock usually has a 3--5 group of marbles.


3. spring: hold the ball in the round hole of the outer lock core.


4. lock tongue (Latch): the retractable part of the lock. The cylindrical inner lock core rotates to drive the lock tongue. Padlock is to drive the lock "nose".


5. key: different height "sawtooth" corresponding to different lengths of marble. The professional term for this sawtooth is the toothed flower.


二, Design:

A cartridge lock is usually used in a cylinder lock. The center of the cylinder lock is a cylindrical cavity with a cylindrical lock core (Plug). When opening, the lock core should be able to rotate.


The middle of the lock core is a slot for putting keys. One end of the slot is open for putting the spoon, and the end is a lever. When the key is fully inserted, the lever receives a bolt and gives the lock core the chance to rotate. The upper part of the groove has a prominent part to prevent falling key pins (also called the lower spring or lower bead) falling, and also increases the difficulty of opening the tool with the tool. There are five to six small holes above the lock core to form a straight line for placing different balls with different lengths. The bottom of the lower ball is spherical, allowing the inserted key to pass easily.


The top of each lower ball is the corresponding flat head (driver pins, also known as upper spring or upper bead). The flat head is pressed down by the spring. Simple locks, each lower ball has only one flat ball. More complicated locks (such as locks that can be opened with multiple keys) will have more than one flat ball on the lower ball. There are several vertical pits in the lock housing for flat head springs and springs.


When the ball lock is assembled, the balls are pressed downward into the lock core by springs. The place where the lock core is connected to the shell is called shear point. When the key is inserted into the lock core, each ball is pushed up by the key's teeth. The seams between the balls are just in the cut point, so the lock can be rotated and the lock can be opened. When the key is pulled out, the beads fall off and stop on the cut-off point. The lock core can not rotate.


Some locks can be opened with the main spoon (Master Key, also known as the lily spoon). This lock is equipped with two sets of flat head marble, resulting in two cut-off points. One of the cut-off points is to open the main key, and the same lock will be the same. Another cut-off point is that each lock is different and can only be opened with a single spoon.


三, Unlocking method:

To unlock the lock, you can use a torque wrench (Tension Wrench) to turn the torque to the lock, and then push the lock spring or bullet up with a needle like Lock Pick until all of them are aligned with the cut point. Normally, the ball in the lock core will not be completely completed in a straight line. Under torsion, only one of them has the force to lock the core. When the marble is pushed to the right height, the lock core will turn a little bit further until it is sold by another bullet. When all the heights of the balls are aligned, the torque wrench can open the lock. Sometimes the craftsman also pulls fast and energetically in the lock with the lock device and pushes up each bullet; in this way, a portion of the bullet will be automatically pushed to the right height to reduce the time for unlocking.


Some simple padlocks only have two to three balls, and the lock core only needs to turn 1/8 circle to open. Experienced locksmith can use no safety wrench and unlocking device, and can be opened with safety pins. But there are also some kinds of special devices in the well built marble locks, which make it difficult for the unlocking device to push the ball to the correct height.


Another way to open the bullet lock very quickly is to open the marble with a vibratory unlocking gun or a Bump Keys. The principle of the two tools is the same: insert a tool under the lower bullet and hit it up at the same time. At this time, the bullet will hit the bullet, and the upper shell is thrown high in a very short time. As long as the moment of the upper and lower arms is separated, the lock can be opened. This method can open a large number of latch locks in unskilled training. It has attracted a lot of attention in Europe, America, Hongkong and other places. In order to prevent this unlocking method, some locks are locked in the lock core, which should be pushed open by the suitable pit on the key.