Marquardt Keypad (1989)

HaaTa · 16 Nov 2016, 07:49

ramnes PM'd me a long while back, saying he'd send me something "interesting". Anyways, it arrived. Lo and behold, it's that interesting Marquardt Keypad thing!
(photos-videos-f64/unknown-marquardt-switch-t11659.html).

DSC07763

So, as any good person with a force curve gauge, I figured it was my civic duty to measure such a rare switch

And, just for kicks, I took my own set of photos, so it can be properly immortalized into my Flickr collection

DSC07626

Flickr Album: https://flic.kr/s/aHskLsMASH

armatus · 20 Nov 2016, 06:17

what type of switch it is?

HaaTa · 20 Nov 2016, 08:21

It's a tactile electrical contact switch.

That extra piece of wire seems to be a filler for a diode.

Daniel Beardsmore · 07 Oct 2017, 00:23

It's older than I expected:

https://www.google.com/patents/US4447687

Patent filed in 1982.