Door closer

Image: Sketch of door closers - bauwion

Door closers (TS) automatically close the opening leaf of the door after each opening process, for which they store the (additional) energy expended by the user when opening the door and release it again during the closing process in a controlled and hydraulically damped manner. Door closers therefore do not require an electrical connection. They are particularly necessary for fire protection doors (fire protection or smoke protection doors) in order to meet their building code requirement "self-closing", but are also used for other doors that are supposed to shoot automatically after each opening process, e.g. between heated and unheated areas. There are

• overhead door closers (OTS), which are visibly placed on the door leaf or frame in the upper area of the door element or integrated largely invisibly into the door leaf or frame, and
• floor door closers (BTS), whose locking mechanism is housed in a box in the floor structure below the door element.

Surface-mounted overhead door closers are further differentiated into (simple) door closers with rods and (visually more appealing) door closers with sliding rail. When using door closers on double-leaf doors, it must be ensured that the stationary leaf closes in front of the opening leaf by means of a so-called closing sequence control in order to prevent the door rebates from tilting and thus the door element from closing completely.  The approval requirements of the respective product must include the intended use, e.g. use on a fire door. DIN 18263-1 contains regulations for door closers with hydraulic damping of type K (overhead door closers with crank drive and spiral spring), which may also be used on fire and smoke protection doors.

Source: bauwion