Welcome to our blog, my name is Darrel Walters, head of the Tech team here at Locksonline.
If your looking at Access Control and fitting a strike release would be a lot of hassle or perhaps the door is such that you cant fit a strike.
There are two common types of Magnetic Locks, Direct Pull and Shear magnets. the most common type are direct pull, however, shear magnets can be fitted on double swing doors and can also be fitted into the head of the door and frame, making for a cleaner hidden installation. With a shear magnet there are two pins on the armature plate then when the door is closed when the magnet gets energized the pins insert into recesses in the magnet or vice versa. The load to open the door is then held by the pins whilst the magnetism holds the lock into place.
Shear magnets are normally more expensive than direct pull because they also have to have sensors fitted so the magnet knows when the door is closed before it energizes, otherwise the lock will not secure correctly. The tolerances of shear magnets is quite tight as well, so if your door and frame has a lot off flex in them perhaps shear magnets may not be the preferred choice.
Direct Pull locks sits on the door and frame and can be fitted to the door in different ways (have a look here). There are different pulling forces for magnets but in general all electro magnets for doors are strong enough to hold a door in a closed position for normal applications. There are stronger magnets on the market of specialist applications and should you need to know more about these type lets us know and we can get some further info for you.
There are brackets available for both types, but again direct pull has a host of ‘L’ brackets and Z/L brackets. The link above would show you the use of these.
Generally magnets work on 12 volt but you can get 24 volt versions, also monitored and un monitored. Monitored versions have sensors fitted and relay outputs that the user can wire to so remotely he can see if the door is closed and locked. Some access control systems can use this information to log and alert if the door is secure or not.
A top tip when fittings a direct pull magnet is to ensure the armature plate is mounted with a degree of flexibility. This is most important as the effectiveness of the magnet is limited if the armature plate is not sitting flat/flush on the magnet.
Many thanks for taking the time to read this blog about Electric Magnetic Locks, it may be enough for you to make your decision on what to use, but if you need more info feel free to pick up the phone or pop an email off.
Take Care and be sure to come and visit us soon.
This blog is the Intellectual Property of Darrel Walters author and LocksOnline Ltd. 2012 Free to copy to anyone who finds it useful to list on forums or in there blogs, To all of our competitors, don't take our content, ideas and images, try and be original and create your own.