What are the types of door closers you really need?
Exterior door closer
The external door closer is equipped with a hydraulic buffer pump unit that automatically closes the door when it is opened. Its main feature is that the door is slower when it is closed, and there is no collision sound after closing.
In-line door closer
The in-line door spring is composed of a hydraulic buffer spring mounted on the door leaf, a slide rail and a slider mounted on the door frame, and a link.
The ground spring consists of two parts, the upper and lower parts. The upper structure is a top shaft and a top shaft sleeve plate, and the lower structure is a rotary shaft rod and a base. The floor spring not only allows the door leaf to automatically close, runs smoothly, is noise-free, but also adjusts the speed at which the door leaf automatically closes.
The door bottom spring or automatic door bow is divided into two types: horizontal and straight. The door bottom spring consists of two parts. The upper part is the top shaft and the top shaft sleeve plate, and the lower part is the bottom shaft and the spring body. Its function is equivalent to the double-spring hinge, which can automatically close the door after opening.