As the first line of defense for the home, the security door is not only the security guard of every household, but also the facade of the entrance and exit. Many people are entangled. Is the security door open inside or outside? Let me talk about this issue today and hope to bring help:
Outside door
advantage:
1. Seen from the wind and water, the security door is set against the evil spirits and must be opened outside.
2, the opening of the door will not occupy the indoor space, but also more in line with people's habits. This is particularly important in the sense of firefighting. If an accident occurs inside the house, it is more convenient to open the door.
3. When the foreign object is hit, the outer opening door is not easy to open inward.
4, making the door lock more secure, cards and other ways can not open the security door from the outside.
Disadvantages:
1. When guests come to visit, if they open the door as they please, they will collide with each other.
2. After coming in from outside, many people will have a smooth door movement. If they don't pay attention, they will rebound. If the neighbor is preparing to go out, they may be hit.
3, although there are cat eyes on the security door, but many people will not pay too much attention to the cat's eye, especially the children at home, even if you open the door just open a small slit may also be smashed into.
Opening door
advantage:
It is safer to open the door, and it is more able to control the other's line of sight. It is easy to defend with the foot when it is uncertain, and it will not affect the neighbors' travel and occupy the public area.
Disadvantages:
1. The inner door lock is not safe and can be easily handled by a card. So go out and remember to lock the door!
2. There is no convenient door opening when you escape. In an emergency, people are blocked at the door and it is not conducive to opening the door to escape.
It can be seen from the above that the security door has its own advantages and disadvantages inside and outside, but in terms of use, whether it is a single door or a child door, it is more recommended to open the door, so that the home space will appear larger, More in line with people's opening habits.
In fact, as long as everyone has enough anti-theft awareness, do anti-lock, update locks, etc., no matter how the door is opened, the safety performance is the same!
Editor in charge: Cong Yurui
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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