when I was a lad, I worked in a truck freight terminal, and the strings of lights we used inside trailers had connectors that were smaller versions of that prop., ...there were IIRC three strips of brass? screwed to a rectangular block of wood at the end of the light string, and the "plug" was shoved into a duplex "receptacle" by every pair of dock doors.....all 450 of em
the connector what the Back to Futre show by "Doc" that connector look like they used on forklift truck battery connector aka early Anderson connector useally handle high current DC system and of course the AC also if rated too
Merci , Marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
There's an old theatre connector series called a "stage connector" that came in two versions, large and small. I don't remember the amperages offhand...
The plug was two brass or copper plates about 1/2" wide wrapped on the sides of a 1/2x1-1/2" block of bakelite from the tip to a covered screw terminal at the handle where the H/N or +/- cable connections were made. Two of these could fit into a connector side by side.
The connector was a boxy looking thing with two brass or copper stripson the inside where you would stick these plugs. The opening was about 1x1-1/2" to accept two plugs. No need for a two-fer...
The dimensions above are approximate and were for the lower amperage version, probably 20-30A. The larger version was probably about 100A.
The plug and connector had the advantage of having a large contact area, but you could VERY EASILY stick your fingers inside an energized connector. The contacts of the plug were also energized when you started to make the connection and you could again VERY EASILY have your hand wrapped around both contacts while making the connection. The ontacts weren't hidden until the plug was fully inserted, and then there was no guarantee that it would insert all the way. There wasn't much pressure on the contacts and could easily fall out (I've heard of varieties with springs between the bakelite and brass) and you all know how well bakelite holds up to being dropped or stepped on...
I'll try to find pictures to post They're almost as scary as the Mole Lugs still in use today. (Needless to say all of this was before UL listing, NEMA, and common sense got the better of the connector...)
Mike: That's the plug I was thinking about, too. Those wicked-looking things were available in 50 amp (full plug) and 25 amp ("half plug") sizes. They were also used in both A.C. and D.C. (carbon arc) circuits. What was so insidious about these things was that they were completely interchangeable . I ran into a few of these stage plugs when I was with the I.A.T.S.E. many years ago. At that time, touring companies still used old "piano boards" that were equipped with porcelain receptacles, old resistance dimmers and the usual knife switches and fuses. There were also "plugging boxes" available for connecting anywhere from 2 to 6 stage plugs to one dimmer circuit. Those things would spark like July fourth fireworks when you hot-plug them . It was common practice to wear asbestos gloves when handling these things because of the relatively small "safe" handle area, and the heat produced in these connectors.
[This message has been edited by mamills (edited 01-05-2006).]