Cross bolt lock
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A cross bolt lock , also known as armored bolt or bar lock , consists of a double bar or bolt (usually with a lock cylinder ). In the lock case this runs almost over the entire inner transverse side of a door. The steel bolts either snap directly into the masonry or are anchored to the left and right of the frame using two lock boxes or heavy-duty dowels attached to them . There are also variants in which the bar lock is additionally provided with a vertical or crossing bar. In this combination, the door can be almost completely armored. If the lock boxes are firmly anchored in the brickwork, it is impossible to pry out or break open the door. The load-bearing capacity of the hinges or lock boxes is therefore crucial for the security of the beam lock. When properly installed, it can withstand a pressure of up to a ton.
Anti-burglary properties
In addition, almost all cross bars have an armored rose made of hardened steel (manganese steel, chrome-nickel steel) on the outside. This is intended to protect the lock cylinder from mechanical influences. The lock cylinder also has burglar-resistant properties in higher-quality bar locks. Then a so-called cylinder dome is used, which not only protects the front of the locking cylinder, but also completely surrounds it and is firmly connected to the cross bolt lock by means of threaded screws . The cylinder dome thus not only fends off drilling and milling, but also offers protection against common break-in methods such as core pulling and lock picking .
Variations
Beam locks also differ depending on the type of door. Main and side doors are to be distinguished in particular. The beam lock on the entrance door is designed so that it can be closed from the outside and inside. This is made possible by a double cylinder. So that the key can reach the lock from the outside of the door, a specially designed hole must be present in the door or it must be drilled first. The hole is unnecessary if the crossbar only has a half cylinder. Then the cross bar can only be operated from the inside. The version with half cylinders is therefore more suitable for side doors.
Locking options armored bolt
- Armored bolt lockable at the push of a button or knob (from the inside)
- Armored bolt lockable from the outside
- Armored bolt lockable from inside and outside
Cross bolt with locking bracket
An additional option for beam locks is the so-called locking bracket. This makes it possible to open the door a crack from the inside to see who is on the other side. According to the principle of steel chains, steel shackles offer additional protection to cross bolt locks.
See also
literature
- Wolfgang J. Friedl: Effective burglary protection: mechanical, mechatronic and electronic building security , 3rd edition: Richard Boorberg Verlag , 2016, p. 41f., Digitized
- Rudiferia / Feichtinger / Gromer / Hauer / Kaiser / Piegler / Raich: Metal technology - basic and specialist knowledge, textbook no. 115545: Verlag Jugend & Volk GmbH, Vienna, 2012, ISBN 978-3-7100-2713-0 .