Dummy cylinder

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Dummy cylinders are shaped like a profile cylinder, but do not have a locking mechanism. These cylinders are used in doors that should not be locked and are equipped with an installation opening for a lock cylinder.

history

The design of a dummy cylinder basically corresponds to that of a profile cylinder defined in accordance with DIN 18252 / EN1303. In 1924 Sylvester Wöhrle, engineer at Hahn AG based in Ihringshausen , applied for a patent for the first profile cylinder in Germany. In 1927 the patent was sold to Zeiss Ikon when the company was dissolved .

Today, there are various dummy cylinders available on the market that can be used to replace commercially available cylinders. They are offered for different door thicknesses and also differ in the type of installation. Patented models with a plug-in mechanism, for example, can be fitted to doors in a short time without tools. Other variants are screwed into the door like commercially available cylinders. The latter is much more time-consuming than assembling the dummy cylinder with a patented plug-in mechanism.

Function, properties, standards

Installation openings for profile cylinders can be closed securely and tightly with a dummy cylinder. In their design, they are massive bodies that have no opening for a locking mechanism. They completely cover the opening of a door. On the one hand, the installation serves the optics and is therefore considered from an aesthetic point of view. On the other hand, the installation has a smoke and dirt repellent function ( fire protection ). By closing the hole, dirt particles and smoke gases cannot get through the opening of the doors.

When used in fire doors, it is necessary to use a certified model made of fire-resistant and heat-resistant material. Dummy cylinders that have been certified for doors up to fire protection class T60 and thus have passed the fire test according to DIN EN 1634-1 are suitable for the majority of the prescribed fire protection doors . These variants meet the special fire safety and building law requirements in order to withstand fires on highly fire-retardant doors for up to 60 minutes. Other models are certified for doors up to fire protection class T90 and thus meet special fire protection requirements.

application areas

Dummy cylinders can be installed in doors of different door thicknesses depending on the design. The latest, patented models fit steplessly into any door thickness and can be installed in the shortest possible time without tools. Dismantling is also possible in a few seconds with a simple tool.

Dummy cylinders are used, for example, in doors for public buildings, office buildings and through doors. However, they can also be used on escape doors or smoke and fire protection doors that must not be locked. In the event of a fire, doors with dummy cylinders close off fire compartments. Smoke and fire cannot spread further through the locked door. At the same time, the cylinder-sealed door prevents oxygen from entering.

Dummy cylinders are also used in private households. There they are often installed for aesthetic reasons, in order to close installation openings in doors. Typical applications are kitchen or children's room doors that do not need to be locked or unintentional locking is to be prevented.

Model variants

So far, there are only a few versions from different manufacturers to choose from:

  • Titalium : The Titalium dummy cylinder from the manufacturer Abus as a solid cylinder rod must be precisely matched to the door thickness. The dummy cylinder is pushed into the profile cylinder hole of the door and fastened with a forend screw in one of the three existing holes. This version is approved for doors up to a fire protection class of T90. The door thicknesses can vary between 35 and 120 mm, whereby the dummy cylinder is not continuously adjustable.
  • BZV 100 FS : The BZV 100 FS from BASI is a variable dummy cylinder that is inserted on both sides of the profile cylinder perforation and screwed to the longitudinal axis with a screw. The screw head remains visible. This dummy cylinder is also approved for doors up to a fire protection class of T90, if an optional middle piece made of brass is pushed onto the axis of the BZV in advance and fixed with the aid of a forend screw. The door thickness must vary between 45 and 95 mm. In contrast to the Titalium dummy cylinder, this version is continuously adjustable.
  • UBZ : The UBZ dummy cylinder from the manufacturer W + M is the current standard. This variable dummy cylinder is pushed as a whole into the profile cylinder perforation so that it is flush with the fitting. It is fixed with a forend screw from the narrow side of the door. This version is approved for doors up to a fire protection class of T90 and can be continuously adjusted in doors with a thickness between 35 mm and 154 mm.
  • EASYBLIND: The patented universal blind cylinder EASYBLIND from W + M is equipped with a plug-in device that can be assembled without tools. The ends of this model are slightly larger than the profile cylinder perforation, which means that the outer part of this dummy cylinder hits the door fitting around the profile cylinder perforation. This version is approved for doors up to a fire protection class of T60. The door thickness can vary between 50 mm and 132 mm, with the dummy cylinder being infinitely adjustable.

Individual evidence

  1. ↑ Guth, Gernot: Door fittings and their biotope a specialist book on doors, frames and fittings . ISBN 978-3-9818068-0-9 .
  2. ↑ BauNetz Media GmbH: Fire protection barriers | Fire protection | Construction products | Baunetz_Wissen. Retrieved June 11, 2019 .
  3. ↑ DIN EN 1634-1 - 2018-04 - Beuth.de. Retrieved June 6, 2019 .
  4. ^ Rüdiger Wormuth, Klaus-Jürgen Schneider, Thomas Ackermann: Baulexikon Explanation of important terms in the building industry . ISBN 978-3-410-24655-8 .
  5. ↑ Dummy cylinder EASYBLIND - Universal dummy cylinder for doors. Retrieved on June 19, 2019 (German).