What is the function of the small knob inside the security door?

The lock knob inside the security door controls a deadbolt. With this small knob, when people are in the door, if they are too lazy to use the key to directly lock the anti-theft door, through this knob, it will save the situation of using the key to lock the door. Moreover, if the door is not locked inside, the door can be opened outside, but after using this small knob to reverse the lock, the security is improved.

The anti-lock door is equipped with an anti-theft lock, which can resist abnormal opening under certain conditions within a certain period of time, and has a certain safety protection performance and meets the corresponding anti-theft security level.

The full name of the anti-theft door is the anti-theft security door. It combines anti-theft and security performance. According to the provisions of the "General Technical Conditions for Anti-theft Security Doors", qualified anti-theft doors cannot be pried open within 15 minutes by using ordinary hand tools such as chisels, screwdrivers, crowbars and portable power tools such as hand drills, or open an opening of 615 square millimeters on the door leaf, or open an opening of 38 square millimeters in a semicircle of 150 square millimeters of locking points.

And the locks used on the anti-theft door must be a special lock for the anti-theft door with anti-drilling function that has been tested and qualified by the testing center of the Ministry of Public Security. The anti-theft door can be made of different materials, but only the door that meets the standard test and receives the safety product production certificate can be called an anti-theft door.

Identification: 1. Grade standard: The security level of the anti-theft door can be divided into Class A, Class B and Class C and Class D, among which Class A has the highest anti-theft performance, followed by Class B and Class C, and Class D is the lowest. Most of the doors we see in the building materials market are Class C and Class D security doors, which are more suitable for general family use.

2. Check the steel plate: the state stipulates that the thickness of the steel plate of the anti-theft door should reach 1 mm, but some enterprises in order to reduce costs, some only use millimeters of steel plate, and the plate is thin and loses the significance of anti-theft. According to the anti-theft door business, when the consumer inspects the steel plate, you can press the steel plate in the door leaf, if the steel plate is pressed, indicating that the quality of the anti-theft door is not up to par.

3. Check the step: The qualified anti-theft door step is made of stainless steel, but some small workshops use stainless iron in order to reduce costs. There is such an identification trick, that is, put the magnet on the lower step, if the magnet is sucked and difficult to take away, it indicates that the stepping material is not qualified.

4. Good locks not only have many lock points: the locks are qualified anti-theft doors generally use three-way locks, not only the door locks are locked, but the upper and lower crossbars can be inserted and locked to fix the door. Often some businesses use more locks to attract consumers, in fact, a good lock is not the more lock points the better, the lock cylinder is not anti-theft, no matter how many lock points are useless.