gumptrick wrote:Very cool! Those are certainly a different design than the BiLock keys I am used to seeing. Not only is the plastic bow a different shape, but there is no active element in the key either.
I'm afraid I don't know much about the history of BiLocks, but it appears that those keys are marked with the name and phone number of the locksmith who sold them? Perhaps it would be possible to contact John Barnes Locksmiths and ask them if they can shed any light on it? Or perhaps contact BiLock and ask them?
The active element was added in more recent times as the original patent was about to expire. This may have extended the life of the original patent but I am not sure on this.
I think I saw some older Bilock cylinders in Sydney marked Bilok.
The Bilock was originally developed for gaming machines (aka one armed bandits or poker machines) where wafer cylinders were found wanting. Since the whole mechanism is contained in the half inch diameter plug, the external dimensions would have been the same as the wafer locks they replaced. The makers also produce a wide range of shells - Australian oval, Euro, screw mortise, nightlatch, Schlage KIK, etc, etc. There seems to be no retail sales of factory assembled Bilock's - they supply the parts to locksmiths who key them as needed to customer requirements. The blanks are 'L' shaped AFAIK, the cuts are clipped (12 cuts 4 levels) then bent into the 'U' shape with a special press. Franchised locksmiths purchase the clippers and presses. Masterkeying needs to be by rotating constants (or one row of 6 pins constant for smaller jobs) as two 'gates' in each of the 12 pins would unduly degrade security.
The makers even make 'bicentric' mortise locks. They have two Australian oval cylinders side by side - so one could be a standard 'C4' keyway and the other a Bilock.