Re: Metal Plate

["RockyTSquirrel" <gafa@/nospam/usa.com>]

ademco  made one back in the 70's  that had a complete switch/magnet  in the
jam  and a metal plate on the moving part..
(no magnet under the metal plate..)
the units could be used  on a metal door without  the metal plate..
the unit  worked best if the switch/maget  was placed in a wooden jam,
cause if a metal jam  the magnet would over time magnetize the jam  and the
switch would become questionable at best....
we used hundreds of them up till around 1981.
RTS


"CH®IS" <sh@xxxxx> wrote in message news:pnSVm.56159$Db2.17754@xxxxxxxxxxx
> "mleuck" wrote...
> > On Dec 15, 9:28 am, "Bob La Londe" <nos...@xxxxxxxxx> wrote:
> > > Just a metal plate. That's all that was found on the top of the doors.
> > > Held down with little nails. It worked for a long time. The plastic
> > > contact recessed in the jamb cleared when the doors were close. What
> > > heck
> > > was it and how did it work?
> > >
> > > It finally failed. That's how I discovered this little oddity. I think
I
> > > recall somebody on here mentioning something like it in the past.
> >
> > I've seen that before but there was a magnet under that plate, strange
> > setup
>
> Which would magntize the plate and keep it working when the door warps and
> alignment is lost???
>
> Just guessing... never seen it done.
>
> - Chris
>