-
Anonymous users2024-01-24The price of the anti-theft door should be quoted only if its specific parameters are different: such as the thickness of the door leaf, the thickness of the frame, the thickness of the plate, the filling and even the paint surface, the price will be a little different.
It should be baking paint, not like car paint, just throw a light and tone a color spray.
As of January 2020, if you can replace it yourself, the price of buying a lock cylinder is actually not expensive, but if you want to ask Master to install it, the price will be higher. >>>More
Optical principle of portal mirror imaging.
The door mirror is composed of two lenses When we look out from the inside of the door, the objective lens L1 is a concave lens, and the eyepiece L2 is a convex lens (see Figure 1 for the optical path) The focal length of the objective lens L1 is extremely short, and it AB the outdoor person or object AB into a very small upright virtual image A B, this image just falls in the first focus of the eyepiece L2, L2 plays the role of a magnifying glass, and finally obtains a more magnified upright virtual image A B, which is just around the bright distance of the human eye, and can see clearly for the situation outside the door >>>More
It is impossible for the general security door to achieve the anti-lock you said. Only one-sided locks.
Buy a cat's eye first. Buy an iron hole opener in comparison with the diameter of the cat's eye. Just ask the carpenter to open the hole. What you are buying is not an anti-theft door, it is a type of fire door. I've come across quite a few at Vanke.