Needed: Narrow case Brake switch, Normally Closed

[JimF]

Sorry to post this here, but I am desperate. I can't find these switches at any of the usual vendors or on eBay so I thought I would ask here if someone has a switch to sell or knows of a vendor with shelf stock.

I need the normally closed version for the magneto style bikes. When the switch shaft is pulled out by the brake pedal, the switch opens.

Jim

[DewCatTea-Bob]

" but I am desperate.
I need the normally closed version
When the switch shaft is pulled out by the brake pedal, the switch opens. "

____ If you're desperate enough to employ other than that which is stock, then it's fairly easy to set-up a (medium duty) mercury-switch to do your needed job (whether for replacing the function of either the odd-type normally-CLOSED B-L.switch, or a common-type normally-OPEN switch).
Many modern bikes use such switches as sensors to open or close circuits (such as for killing the engine if the bike falls-over, or keeping the engine from being started if the side-stand is down, etc.).
It's just a matter of setting-up the switch so that it's mercury will (in this case) flow AWAY from it's internal-connectors when you're DEcelerating.
Such a switch could possibly be installed most anywhere, including inside the taillight-body.


Fun-Cheers,
-Bob

[graeme]

Or a micro switch from an electronics store, most are n/c n/o and come in all sorts of configurations such as push or pull.

[DewCatTea-Bob]

" Or a micro switch from an electronics store, "

____ No-doubt such switches could provide the required make&brake circuit-type but, it's not so clear as to what activation-method would be used for it's switch-circuit. _ Whereas a mercury-switch would be activated by the change in gravity vs inertial-force. - Quite easy to set-up, however trail & error adjustment would be a matter of course, of-course.
__ This idea of using a mercury-switch for brake-light activation came to me (many years back) because, I had known of a similar G.vs.I-F operation which used an encased ball-bearing (in place of mercury) ramp-fixture, employed for operating the brake-light on a Schwinn-bicycle which I had (been given for a birthday) back in the mid-1950s.


Fun-Cheers,
-Bob