Bolt

The tongue is a very vivid word. If the side of the door with the lock is regarded as a mouth, then the tongue does spit in and out like a tongue. There are many types of bolts, including diagonal bolts, square bolts, anti-saw bolts, double hook bolts, etc. The lock cylinders are also divided into single bolt lock cylinders and multi-point bolt lock cylinders based on the number of bolts.

Like other technological products, the evolution of the lock tongue is also advancing with the times. The common one is the slanting tongue. The inclined surface design of the slanting tongue and its internal spring parts are entirely for the convenience of closing the door, but because the structure also facilitates "opening the door", I have used a membership card to open a single latch door lock. The structure of the diagonal tongue is too easy to be cracked, so people invented the square tongue.

The difference between the square tongue and the diagonal tongue is that it does not contain spring components, so it cannot be automatically ejected or retracted due to external forces. The square tongue is controlled by the action of opening and locking the door, and its fixability is strong. Because of this feature, the square tongue must be operated to make it work. This is why most domestic exterior door locks now use a combination of diagonal tongue and square tongue.

There is another kind of anti-saw bolt. The anti-saw bolt uses its strong material and the structure of the internal rotating bolt to increase the time of the saw bolt. The anti-saw bolt of the Probuck fingerprint lock has an anti-saw time at least There were 3 hours, which greatly increased the "difficulty of breaking through" the culprits.

The double-hook bolt is an effective way to deal with this method. From the figure below, the double-hook bolt is in the "locked" state. It is a circle. This circle is used to hook a certain part of the door frame, just like a person doubles Arms firmly hug a pillar. If you want to separate the person from the pillar, you must break his arms apart. However, it is difficult from the structure of the double hook, so the double hook bolt is a good solution. this problem.