In the world of access control, how you control the door is one thing, wether it be with a keypad, Proximity Reader, or even a fingerprint reader. At some time, there will be a need for the correct input from one of these devices to operate a locking solution on the door in question.
Times in the past, we would have had a strike release, quite possibly operating a Yale type night latch. This is by far one of the most popular forms of locking a door.
We are seeing however, more magnets being used these days, simply because the ease of installation. You dont have to be qualified with a chisel to fix a mag on a door, unsightly, Yes, but practical most definitely.
One small market sector that sit in the back ground quietly being used by the experts in the access control market are Solenoid Bolts.
There are quite a few manufactures around the UK that make these bolts, probably the most common would be Alpro and Adams Rite. Trimec and Clark Instruments make solenoid bolts as well.
The basic prickle of all these bolts are when power is applied the bolt will lock, and obvious when power is released so will the bolt. Nearly all solenoid bolts have this function of operation, simply because most bolts would not have a mechanical type override to its operation.
Fitting the bolt can either be in the frame or door, if fitted in the door a cable will need to be fed through the door to the bolt, it is more common to fit the bolt in the frame and the keep in the door. This means there is no need on trying to get a cable across the door and the installation will be a much neater job.
To stop the bolt shooting out when the door is not closed the keep has a magnet fitted. when the door is closed the magnet come in contact with an area on the bolt to say the door is in place to let the bolt to be thrown. Because there is in essence no force behind the bolt other than the force of a spring. the hole in the keep is normally a little oversized to stop any friction on the bolt from coming out all the way. This nessiates that the installation has to be quite precise in the first instance. Solenoid bolts dont have the flexibility of Magnets.
Most bolts have sensors built in to them that know when the door is shut and locked, these outputs can drive lights, indicators, or send information back to an access control system, alerting the operator that the door is secure.
Some manufactures like Adams Rite and Alpro do surface kits for the bolts as well, making the installation even easier, abate the lock in now on the surface and maybe the security would be slightly reduced.
The holding power of these locks are quite immense and it is common to fit one, One third down on door and one, one third up the door. this gives good overall security to the door, which can be quite formidable indeed.
The article was written by
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