Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1997-08-19
1999-06-22
Friedhofer, Michael A.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200517, 200344, H01H 1370
Patent
active
059144688
ABSTRACT:
A keyboard unit having a base plate, and a plurality of key switches provided on the base plate. Each of the key switches has an electric contact provided within a membrane sheet on the base plate, an elastic dome portion formed on the base plate so as to cover the electric contact, a bearing portion provided on base plate, and a key cap having a support shaft which engages the bearing portion, and an engaging portion which engages the dome portion. When the key cap is depressed, the dome portion is elastically deformed so that an inner surface of the dome portion presses against the electric contact, and when the key cap is not depressed, deformation of the dome portion is removed so that the inner surface of the dome portion is separated from the electric contact and the key cap is pushed up by the dome portion.
Chiba Toshimi
Nishimura Takashi
Nozawa Yuichiro
Tachibana Sadao
Tozuka Zenzo
Friedhofer Michael A.
Oki Electric Industry Co. Ltd.
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