Information of Door Closer | KEYline Consulting - Malaysia Architectural Door Hardware System and Security System

Classification of Door Closer

A door closer is a device that closes a door, in general after someone opens it, or after it was automatically opened. The self-closing function offered by door closers provides an important level of security for external doors and fire doors along exit routes in building.

There are three styles of door-closer: overhead, surface-mounted and jamb- mounted. Overhead door closers, can be concealed or surface mounted, whereas jamb mounted closers, fit between the door and the door frame and are totally concealed when the door is closed. A surface mounted one, is attached to the door frame behind the door (where the hinges are) next to the middle hinge. The arm rests against the door, and a spring that is bent by the user opening the door closes the door by retracting to its proper shape.

Selection of Door Closer

Choosing a door closer can involve the consideration of a variety of criteria. In addition to the closer’s performance in fire situations, other criteria may include resistance to opening forces (for use by disabled or infirm) as well as safety, durability, risk of vandalism/ligature and aesthetics.

Use of Door Closer

To limit the speed at which the door closes, common door closers use hydraulic (oil-filled) dampers, although spring mechanisms may also be used. The speed at which the door closer closes the door may be adjustable by up to two set screws. These screws aften adjust the sweep speed and the latch speed of the door. The latch speed is the speed that the door travels in the last third to 10 degrees as it closes and is aften set fast so that the door can properly latch closed. The sweep speed is the speed which the door travels at along the first two thirds of its travel and is often set slower than the latch speed.

Door closer is installed at top of flush door panel to be opened in single direction, a device to realize function of automatic door closing.
Door closer does not carry weight of door; it shall be used together with hinge or floor spring.
When installed in apair flush doors, it shall be used in cooperation with door coordinator, and fire-proof door must be installed with door closer. Door loser installed on fire-proof doors must act to close door and latch the lock to prevent flame spreading.

Function of Door Closer

Door closer can ensure door opened is able to close automatically; it protects safety of household together with door locks.

To keep the door fixed in the position automatically after the door opens: It’s able to hold a door open in a certain position by the special accessories or the interlock function added to the door, however, this device is unsuitable for the fireproof door or the door required to be with the smoke proof function.
To reduce the resistance: there will be a resistance reduction when the door is opened to a certain position with a hastiness, which can also be adjusted in need of the reduction force. This function is used to prevent the damage from the strike of the door or clock against the wall when the door being opened hastily.
To delay the door close: the door will close from the widest position with a regular speed which is able to be adjusted in the need. It is suitable for using in the places where there’re many people and people frequently go in and our, especially in hospital doors and access, elder people, children and disabled persons pass.

Keyline / K-Line - Information of Door Closer

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