Break Dome protector

[Tom Sutton]

"Break Dome protector used for security purposes which inhibit casual use of the internal turnknob release facility, and provides a clear visual indication of unauthorised exit."

 Does anybody know where these Break Dome protectors can be purcased.

[John Webb]

It's possible an architectural ironmongers may have these in stock. I've bought door closers, panic bars etc from a couple of such places local to me.

[slubberdegullion]

I have seen many of these devices in situ and most have already been broken by people mistakenly (or otherwise) grabbing them and twisting them (precisely the action required to remove the plastic cover and render the entire device redundant).

Personally I would recommend one of the many other types of device which achieve the same ends.  More reliably.

Stu

[AnthonyB]

You are describing either the 'ASSA' dome or the 'UNION' dome, the names deriving from the manufacturers Abloy-Assa & Union.

Both are based on the escape mortice deadlock, i.e. thumb turn on the side for escape instead of key. The ASSA dome is a plastic cover with curved handholds and is designed to be twisted with the thumb turn, breaking the device & indicating the exit has been used.

The UNION Dome is fully dome shaped and must be broken by striking the surface then removed allowing the thumb turn to be used.

Both are designed to discourage casual use of the door whilst allowing easy use in an emergency, but are not intended to prevent determined users and should be supplemented by signage.

Union Domes are still manufactured-  http://www.directlocks.co.uk/union-8070-emergency-exit-dome-turn-escape-locks-p-710.html & spare domes available.

Assa Domes are discontinued.

[Tom Sutton]

Thanks to you all especially AnthonyB just what I needed. It was the result of an enquiry and I have no idea why he required it.