Gary Stephenson wroteI always quite liked the office quality model. Slight bevel on the door edges and if I remember correctly the lock was a 6 lever similar in design to the 6k75 lock, unusual to hear Chubb locks of that era described as a not very good.
Gary were those the early generation of the Commerce models? Can remember seeing a few like that, opening/re-keying etc but they had distinctive stepped doorplates, they were pretty thick too easily 3 or 3.5 inches, with nicely bevelled edges around the door front like you say, and the heavy continuous hinge divided by chromed spacers to match the doorpull and handle.
Always thought those locks were the early 6k75s though, going from memory.
Also from memory I encountered a variation which was identical externally but had the even weirder sliding and pivoting bar relocker linkages around the perimeter of the boltcase with the ‘sprung triple gated Lever relocker’ (for want of better description :-)
Think that type of dead relocker was seen more on the early ABPs though?
Chubby wroteWhat was the thinking behind the ballbearing used as a link in the trace to the AED?
Chubby, in your original post you pretty much answered your own question in that the simplicity of the looped wire over the ball bearing was exactly that- very easy and cheap to manufacture but also very effective in its operation.
It guaranteed very sturdy contact when held ‘off guard’ but also provided sensitivity by its small and precise contact area ensuring it was instantly triggered under attack. Dont forget this was before the development and use of tempered glass plates.
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