Marquardt Series 6180
Series 6810 is a keyboard switch series from Marquardt. Marquardt reported that this series was manufactured from 1983 to 1995. US patent 4653179 “Method of manufacturing an electrical push-button switch” (filed in July 1985 with priority to German patent 3327199 filed in July 1983) covers the manufacturing process for the switch contact assembly. The contact assembly was re-used for the successor series 6184 although with a different actuator design.
These switches are rare, with few examples discovered to date; examples include:
- Fametech Tysso PKB-080 POS keypad; no known date
- Olympia Carrera electric typewriter, presumably early 80s (pictures currently out of action)
The switches in the Tysso PKB-080 are clearly 6180 series, although they are not an exact match for the drawing of 6180.0101 provided by Marquardt.
The following specifications were taken from the drawing for :
|Total travel||4.0±0.3 mm|
|Operating force||55±15 cN|
|Switching voltage||28 V maximum|
|Switching current||50 mA maximum|
- 6180.0101 engineering drawing, supplied by Marquardt