Re: Another unusual plug and some other questions
I think the cord entry is arranged like that because the alternate action mechanism relies on a rotating ring or arm from which the cord exits tangentially. There were other types of lampholder attachment that had some kind of radial cord configuration, such as the Dim-A-Lite resistance dimmer on which the whole outside of the body rotates carrying the resistance studs past brushes on the stationary core. Here the cords exit through two fairleads on arms attached to the bayonet plug. It does indeed cause the fitting to swing when operated, however it works well in a standard lamp.
Is that convertible adaptor gadget a Lundberg product by any chance? I have one with the same BC / 5A contact arrangement but without the twisty top. The pins are extended or retracted by pressing in a locking lever and telescoping the body. It's certainly much less clumsy than the traditional BC-5A converter attached to the 5A plug by a piece of string.
Lucien
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