.:: Keypicking :: Anything And Everything For Locksmiths, Hobbyist Lock Pickers, Locksport, Lock Picking, lockpicks, cutaways and Security. Simply The Best Lockpicking Forum Around!

Can anyone tell me what this old key was used for?

Looks like a Door Closer adjustment tool. Used to set the swing and latch speed. I have other brands that look similar. The forked end reaches down into a recessed hole that has a Slotted head screw.
Just guessing.?

I like jharveee's guess, it looks alot like a door closer tool. I might venture another guess, that would be for unlocking bathroom locksets. I have seen a few old ones that took a similar tool but I am not familiar with the manufacturer. So, 2 answers that are guesses! So much for sure things!

It's an old 8 line sargent knob tool.
It's to turn the little lock knob on an entrance knob set.
Bach then, when inside, you could only press in the little button without the tool.
Upon exiting, the little button popped out, thus unlocking the knob. You had to press it in again before closing the door to lock it.
Two little hole were in that button, like snake eyes screw. With the tool, in addition to pressing
the button in, it could also be turned to change the knob function to a store room function so that it would always be locked.

You can still find this function on newer knobs but in general, no tools is needed to turn the little lock button.

M.

Thanks for the info. I really appreciate it.

I have one of those, never knew what it was for!!