Door damper

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A door damper is a movement damper for doors. It can currently be designed as a friction damper or as a fluid dynamic damper. Door dampers are often part of a door closer which , in addition to an oil-hydraulic adjustable damper, also has a spring for closing the door leaf . Friction dampers are also used for smaller doors and flaps, such as furniture doors and toilet lids.

Designs

Door closer

Door dampers with return springs are connected to the door via a lever mechanism and gear. When the door is opened, a pre-tensioned spring is further tensioned by the opening moment. The dampers are disabled by check valves . If the door is no longer held open, the torque exerted by the spring closes the door, whereby a hydraulic damper limits the speed. An adjustable throttle valve is used for this . Another throttle valve is released in an angle range that can be set by the lever mechanism, shortly before the door falls into the lock. With this, the angular speed of the door in the area shortly before closing can be increased again in order to safely apply the forces necessary for the closing process.

Door damper with gas spring damper

This design is often found in motor vehicles and on machine doors and is described under the article gas pressure spring.

Door damper with friction damper

This type is mostly used for (furniture) doors with a horizontal axis of rotation, where it also serves to limit the opening angle. The damper consists of two sliding elements that are pressed together by a spring. The pretensioning force of the spring should be set in such a way that the door does not cause unnecessary force peaks when it is "dropped" in the stop.

Small door damper (e.g. for furniture doors)

The usual mini door dampers are based on the principles of grease friction and surface friction. They make it possible to greatly reduce door slamming noises and vibrations. They are usually attached to the fixed door frame part and only come into action in the angular area shortly before the closed door end position. For this purpose, they are moved into the working position by an integrated spring when the door is opened, from which they develop the damping effect during their working stroke when the door is closed. The stroke is usually in the cm range. Due to the principle of fat friction, the useful temperature range is determined by the fat and can lead to temporary failure in the case of simple fats, for example due to direct sunlight or cold.

Web links

• Operation of Dictator door buffers, In: Dictator.de

Footnotes

1. ↑ DICTATOR technology: door dampers for revolving doors and sliding doors against slamming doors. In: Dictator. Retrieved October 6, 2019 (German).