Allen tool question

[mowkep]

So I found an Allen tool yesterday. It is a 5" extension with .275 square x .540 deep square on one end with .285 x .540 square broached/cut into the other end. It has Allen tool co. Hartford Pat. June 7 1910 on it. This site won't allow me to post pictures for whatever reason. Any ideas on exactly what it is?

 

[leg17]

Interesting.
Early 9/32 drive.

 

[mowkep]

In researching, I found ads for a 2",4" and 6" tap extensions from 1920. It says something about making your taps a pulley tap with the extension. This is a 5" one. A 3/8 tap or 10mm tap by todays standards barely fit into the square. If that truly is what it is.

 

[mowkep]

My bad...just a 4 and a 6 which can added together to make a 10" extension.

 

[mowkep]

Interesting, I found an ad in shipbuilding literature for the 3 piece...cool to see all the old time stuff

 

[6PTsocket]

Allen ended up as part of the Apex group, and they just shut it down for good, along with Armstrong and KD.

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[cherrybomb]

So Armstrong Tools no longer in business,what a loss to the industry