Break Glass Unit.

This is something a bit different!

I made this about 15 years ago, for a job that I believe was at 
The London School of Music.

They were having Secondary Glazing fitted, for acoustic purposes
and didn't want the panels to ever be opened - only for cleaning
or in the event of a fire - hence the Break Glass feature.

The panel would be closed, the centre pin depressed and the safety
pin engaged.
The glass would then be slid in and secured with the fixings at the
ends and then the safety pin would be removed.

To open for cleaning - Safety pin in, remove one of the fixings, slide
out the glass, press on the head of the locking pin and release the safety 
pin, the locking pin comes out.
In the event of fire - wallop the glass with the small hammer chained
close by and the pin comes flying out. 
Instant release.  

I used to use this as a Party Piece at Exhibitions.
Something a bit unusual! 

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