Bumper bead, the correct term should be door suck, also commonly known as door touch, is also a kind of door page after the opening of the door to suck the positioning of the device in order to prevent the wind or touch the door page and close. For example, the most common doors need hinges to open and close properly, the door behind the door need door suck to ensure that the wall will not be hit.
Door suction is divided into permanent magnet door suction and electromagnetic door suction two kinds of permanent magnet door suction is usually used in ordinary doors, only manual control; electromagnetic door suction in the fire door and other electronically controlled door and window equipment, both manual control and automatic control functions.
Expanded information:
While the door suction effect is very good, the fixed door at the same time can protect the wall Not only is not beautiful will damage the wall, but in order to protect the door and have to install. However, now the market has come out of a better anti-collision artifacts, easy anti-collision sound insulation, but also cheap.
Most of the traditional door sucks when closing the door will have a big impact sound, but this anti-collision mute door mat is directly affixed to the wall, and the handle of the impact of the same position. As long as the paste on the wall can prevent the appearance of wall pits, shock-absorbing effect to carry. But the requirements of the wall is relatively high, but for most families nowadays, are pasted porcelain walls is not a big problem.
Baidu Encyclopedia - Door Suction