Fire doors with panic bars may have OAD handles/knobs on the outside. This allows the door to also be used an an entrance.
Doors fitted with older OAD such as the Exidor 298 cannot easily be re-keyed if the tenants change or keys are lost. (The 298 is also discontinued and nigh on impossible to find). In the photo above a new style Exidor knobset has been fitted that has an easily replaceable lock cylinder.
This lock was fitted to a commercial premises. It is a Chubb 3G110 which is an excellent detainer lock. (Detainers are a bit like levers). This lock costs several times more than a normal mortise lock.
The lock was opened to change the detainers so it operated with a different key. It was immediately obvious that somebody in the past had removed all the detainers. In this condition the lock could be opened by any key that fitted into the keyhole – or even just a screwdriver or lolly stick. What would have been presumed to be a very secure lock actually had no more security than a garden gate latch.
New detainers were fitted to the lock and it now secure – as it was designed to be.
On an unrelated subject, we’ve been called to open 3 separate Mercedes cars this week with keys locked in the boot. One of them was at 3am on the M5. Normally we might open one Merc in a whole year. Not sure why Mercedes owners are being more careless than usual at the moment.
We picked this British Standard 5 lever lock to open a commercial premises for the client. The main key had been lost and the spare key was several hours away.
BS locks are designed to be difficult to open without the key. They have to have a certain number of possible keys, a minimum specific time for a cutting attack on the bolt, and various other limits. They certainly aren’t easy to pick unless you know what you’re doing. This lock is a Union Strongbolt and is one of the more common locks.