ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Recent Posts
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
AFDD's coming to the UK
by Texas_Ranger - 01/17/23 07:22 PM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 9 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Oct 2000
Posts: 3,672
Likes: 2
Admin Offline OP
I have a variation of Trumpy's bayonet adaptor, designed to convert the bayonet to a 5amp two pin socket. There are the remnants of a retention cord, so I think it was originally attached to a mating plug. The appliance could thus be used in a wall socket or light socket as available.
The other pictures show a CLIX plug, using springy brass cotter pins as connecting pins and also to attach the flex. The serrations inside the cover do "click" over the heads of the cotters as it is screwed down. The natural spring of the cotter pins ensures a good tight mating in a socket; and a lot better contact than some modern plug/socket arrangements I've encountered ! I consider this a particularly ingenious piece of design for its age.
I'm guessing they date from about 1930 (?).

- Geoff

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

Joined: Jul 2004
Posts: 787
Originally Posted by Webmaster
[quote]There are the remnants of a retention cord...

What is a Retention cord in American English?


Larry C

Joined: Aug 2001
Posts: 7,520
The cord was just used to tie the adapter to the plug/electrical cord to keep it from getting lost.

You could then just ignore the adapter and insert the plug straight into a wall outlet, or couple it up to the adapter and plug into a lighting pendant from the ceiling.

On that 5A plug, I remember having a lot of those around at my grandparents' house in the the 1970s. I'm not sure when the design first appeared, but I think they were probably still being made in the 1940s.

Joined: Jul 2002
Posts: 8,432
Likes: 3
Now there is a device I've never thought existed.
The lampholder contacts on the top of the adaptor look like brass screws.
I would imagine that any cord you used on the plug would have to be reasonably light to prevent the plug from falling out of the socket due to the wieght of the cord?.

Joined: Aug 2001
Posts: 7,520
Originally Posted by Trumpy
The lampholder contacts on the top of the adaptor look like brass screws.

They are. It was a common arrangement on these adapters. Some had a slightly different arrangement in which the contacts were a flat head (sometimes hex shaped) set into the recess, then the screws to secure them went in from the sleeves of the 5A socket.

I would imagine that any cord you used on the plug would have to be reasonably light

Maybe if the plug contacts closed up (or the sleeves in the socket opened out), but the old 5A plugs can be a surprisingly tight fit.

The "splayed out cotter pin" style prongs of the plug pictured always used to hold very firmly.

Joined: Apr 2006
Posts: 233
I just remember these things from the 70s

My mother standing in the middle of the kitchen doing the ironing pluged into the light pendant . Then I would get hell for flicking the light switch off as I leave the room. (No neon indicators in those days)

Iron and plug 1950s

der Gro├čvater
Joined: Aug 2002
Posts: 1,691
They were made by Ediswan. I have a bunch of those lying around that I got from a guy in the UK, along with three lampholder adapters.

And yes, the string is to hold the plug and the adapter together so you wouldn't loose them. In fact, one of the sets still is tied together with its little piece of rope.

Last edited by SvenNYC; 09/18/07 11:25 AM.

Link Copied to Clipboard

Tools for Electricians
Tools for Electricians

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Delaware County, PA, USA
Posts: 187
Joined: November 2005
Top Posters(30 Days)
BigB 9
triple 3
Popular Topics(Views)
302,482 Are you busy
231,875 Re: Forum
216,499 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5