Amongst the selection of tools I have recently acquired were these unusual taper nosed drill chucks. They were manufactured by Cardinal and Brooke Tool of Birmingham. The Brooke Tool chucks are engraved as Made for Alfred Herbert Ltd, Coventry England It also carries the legend Manufactured by Brooke Tool , Birmingham, Eng and the legend No 1, CAP 1/4 , Pat. 381441
I looked up the Patent Number and found it was issued in 1932.
I was trying to find a key to fit this chuck and wondered if anyone has a similar chuck, and if so, what Jacobs key number fits it. I have tried most of mine with no success. I assume it uses a Jacobs key as they have Jacobs #1 mounting tapers. Considering they are most likely pre war they are in great condition being unused!