08-05-2019, 09:24 PM
Nice! I haven't seen one of those, though I have come across other plugs with a similar concept. For example, the "Fitall" plug from Larne in Northern Ireland. It has pins that can fit 5A or 15A round pin sockets or 13A flat pin sockets. The unused pins retract inside the plug, but there is a serious design flaw with the Fitall plug. If it's inserted into a 13A socket with a metal faceplate, the unused pins can stick out enough to touch the metal socket causing a short circuit and a loud bang! There are modern travel adaptors which still work in the same way, having pins that can be pulled out or retracted depending on which style of mains socket they need to fit.
I also have a 2-piece bayonet to 5 amp plug adaptor. One half is a BC plug to 5A 2 pin socket, the other part is a normal 5 amp 2-pin plug.
It looks like there's a patent number on your plug. See if you can find any information on espacenet.com . I have a Magnet branded BC double adaptor; when I looked up its patent number, I found the patent was issued in 1912 - so the design is much older than I thought. I was also thinking 1930s-1950s. I guess these things would have stayed in production for quite a long time.
I also have a 2-piece bayonet to 5 amp plug adaptor. One half is a BC plug to 5A 2 pin socket, the other part is a normal 5 amp 2-pin plug.
It looks like there's a patent number on your plug. See if you can find any information on espacenet.com . I have a Magnet branded BC double adaptor; when I looked up its patent number, I found the patent was issued in 1912 - so the design is much older than I thought. I was also thinking 1930s-1950s. I guess these things would have stayed in production for quite a long time.
