Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1983-05-16
1984-08-28
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200159B, 200306, 200340, H01H 1370
Patent
active
044685424
ABSTRACT:
A keyboard assembly including a plurality of key operated switches, each of which includes a dome associated with contacts on a printed circuit board which when triggered upon being subjected to a triggering force closes the switch and upon being released opens the switch and a keycap or push button for operating the dome and a transmission system for transmitting a force from the keycap to the dome which includes an actuator extending from the keycap and a conically shaped helical spring between the actuator and the dome with the small end of the spring in working engagement with the dome. The underside of the dome is vented to the atmosphere through a vent in the printed circuit board which is sealed against contamination of dust by a perforated adhesive backed plastic film or sheet over the underside of the printed circuit board.
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KB Denver, Inc.
Scott J. R.
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