OK, so we're going to take a
look inside of the single pole,
double throw lever switch.
So we have one pole right
here and two throws.
And what that basically
means is that we
can connect to three different
locations on this switch
and control the power
in two circuits.
So we're going to take a little
small watchmaker screwdriver
and pry open the housing.
OK, so this is the inside
of our lever switch.
You can see it's all
taken apart for us.
And there are two contacts here.
There's one pole
here and two throws.
And so what that means is
when the switch is open,
it can let the power
flow in one circuit.
When it's closed, it can let the
power flow in another circuit.
Or it can just
close that circuit.
So you can see what happens is
there's a little tiny plastic
hammer here that pushes
against the spring,
so the lever causes the spring
to push down on this copper
contact.
And that is switching between
this side and this side.
So the switch is basically
opening and closing
the circuit between
this side and this side,
and then between this
side and this side.
So if you watch carefully,
you can see that little copper
contact shifting up and down.
I believe these pieces
are made out of aluminum.
It looks like this
spring is spring steel.
It looks like we
have the lever here,
which is probably nickel-plated
steel, it looks like.
And we have a copper
contact that the spring
is connected to.
And I think the housing
is made out of ABS.
And again, that's an
injection-molded housing.
You can see that it's got
these little spikes here
that stick up.
I'm not sure if you
can see that too well,
but there's little spikes there.
And they basically go through
the top of the housing
here in these little tiny holes.
So if we put this like
this, that's how it goes.
And those little tiny spikes
will stick through those holes.
And then what
they'll do is they'll
take a hot plate or
a hot piece of steel
and push it against those spikes
that are sticking through.
And they actually mush down
like a mushroom on top of this
and hold it in place.
And so that's what the top
of our single pole, double
throw lever switch,
how it's held in place.
And again, that looks like an
injection-molded piece as well.
So again, when we
push the lever switch,
it switches between
this contact.
This contact is
always connected,
but it switches between
these two contacts.
So there's single
pole-- this is the pole,
and there's two throws.
So you can see these
two throws are there.
And when the switch
gets bumped, it
switches between those throws.
