assaabloy.com 21 Door controls Introduction What additional functions are required? Additional features can help ensure your closer is the perfect solution for your door. Adjustable functions To fulfil the requirements of EN 1154 all door closers have a closing and latching speed function. Some door closers may also have additional features such as backcheck and closing delay functions. Closing speed Latching speed Backcheck Closing delay Closing speed: Speed of door leaf during closing cycle from any angle to approx 15° Latching speed: Speed of door leaf in the final 15° of closing until it reaches its fully closed position. Designed to allow closers to overcome the resistance of a door latch in the last stage of closing without slamming Backcheck: Opening motion of the door is hydraulically slowed down from an opening angle of about 75°, this can be beneficial on outward opening external doors and internally helps to prevent damage to the surrounding structure and handles Closing delay: Delay in the closing speed between its maximum opening angle to about 70°, giving you additional time to pass through the doorway Electromagnetic functions Electromagnetic door closers include hold-open and free-swing functions which are suitable for building applications with high traffic, or to provide ease of accessibility for the less able. They also help eliminate touch points. Hold-open: The door is held open at the selected opening angle (beyond 65°), until the power is cut when fire or smoke alarms are triggered, releasing the hold open function and allowing door to close. Free-swing: The door operates as if there is no door closer present. When the alarm signal is received, the door closer shuts the door regardless of the door position. Integrated with a fire or smoke alarm, electromagnetic door closers either release the door (hold-open) or allow the door closer to work conventionally (free-swing), closing the door when the alarm is triggered or they are manually released. What type of door closer is required? A wide range of closers to suit all functionalities, aesthetics and end user preference. Cam-Motion® technology provides rapidly decreasing or increasing torque to assist with the closing and opening of doors. They are provided with a guide rail, which sits flush to the frame. These door controls are the most traditional and widest used style; they are supplied complete with a projecting link arm to allow the opening and closing motion, parallel (non-projecting) options are also available. Rack and pinion Concealed Floor spring Transom Special solutions Cam-Motion® Designed not to be seen, whilst still offering class-leading performance across a wide range of applications with high efficiencies and easier opening. Floor springs are concealed under the finished floor level to offer control to your door with the unit hidden from view. They are especially suited to areas with high traffic as well as heavier doorsets. Concealed in the frame head and traditionally associated with aluminium systems, when fire rated they also offer reliable closing for timber or metal doors. This is particularly beneficial in place of floor springs where a project does not allow for floor mounting. Specialist door closers can provide additional benefits around locking, slamming and also large or more demanding door applications. These products offer additional aspects to support and solve such issues and provide a perfect solution for challenging projects. TIP In accordance with building regulations free-swing closers are recommended for use on care home bedroom doors. The use of free-swing function should be thoroughly considered for applications such as nurseries. Doors with an uncontrolled free-swinging state could be a hazard to small children. For these applications, we recommend a controlled free-swing door closer.
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