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In some locks (e.g., American and Laperche), antipicking lower pins are also used. This idea was mooted around 1940 in a patent by Crousore (Fig. 2.22), which called for grooved upper and lower pins cooperating with a channel in the plug. An even earlier method that involved modifications to the lock cylinder was presented in a 1928 patent (US 1,739,964).

xcaetusx wrote:So, I posted the same thing over on Reddit, but figured it should be posted here as well.

So, I was digging around in the High-Security Mechanical Locks: An Encyclopedic Reference and I found this paragraph. Might help lead you in the right direction.

In some locks (e.g., American and Laperche), antipicking lower pins are also used. This idea was mooted around 1940 in a patent by Crousore (Fig. 2.22), which called for grooved upper and lower pins cooperating with a channel in the plug. An even earlier method that involved modifications to the lock cylinder was presented in a 1928 patent (US 1,739,964).

MHM wrote:Pretty sure the mushroom pin was the first anti-pick pin and went right back to Linus Yale Jr himself which puts it back to 1860-odd.

His list of patents is pretty goddamned impressive (and wide ranging, the man had his finger in a LOT of pies) but I don't see anti-pick pins there, maybe the design was too simple to patent?

https://en.wikipedia.org/wiki/Linus_Yale_Jr.

I'd love to hear if anyone knows any different.

Michael.

More in detail, my invention embodies a cylinder using mushroom, or partially cut-away drivers of the class already known in this art

MHM wrote:Wow, never seen that patent, it's fascinating but as you say, hard to know if it's the absolute first. Look at the little groove in the lock body. But holy shit, 1936. So late.

iii_Kraken wrote:

MHM wrote:Wow, never seen that patent, it's fascinating but as you say, hard to know if it's the absolute first. Look at the little groove in the lock body. But holy shit, 1936. So late.

I am pretty certain I have the answer!

1865 the first security pin was developed by Linus Yale Jr. in a very subtle form of perpendicular notches in the top tumblers. ( you have to read the PDF version at the top)
https://www.google.com/patents/US48475

In 1928 W. D. Hainline milled notches in the top of the plug
https://www.google.com/patents/US173996 ... UQ6AEIKDAA

And in 1932 Frank E Thompson milled the mushroom
https://www.google.com/patents/US204320 ... 0Q6AEIPTAD




I cant find anything more anywhere... I am going to assume this is correct haha