Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1990-06-11
1991-07-23
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200517, H01H 1370
Patent
active
050345737
ABSTRACT:
The contact-type keyboard comprises a plurality of keys which are movable from a rest position to an operative position and which each have a sleeve capable of being accommodated in a tube provided on the upper part of a dome portion of elastomeric material. Each dome portion projects from a mat and, below the tube, comprises an internal circular ring provided with a movable conductive portion for short-circuiting a corresponding fixed conductor of a printed circuit which in turn is carried by a stop plate of insulating material. Each sleeve is of such a length as to pass internally by way of an upper opening through the dome portion, to engage a through hole in the plate to project downwardly beyond the plate and comprises a seat capable of accommodating a corresponding pin of a support frame structure so as to guide the respective key from the rest position to the operative position and vice-versa. The support frame structure is positioned below the stop plate at a predetermined spacing such that it does not interfere with the end of the sleeve when the respective key is in the operative position. The key is in turn restrained to the plate by means of a lateral appendix which is freely accommodated by a seat in the plate and provided with a hook portion which is retained by the plate.
REFERENCES:
patent: 4246452 (1981-01-01), Chandler
patent: 4319099 (1982-03-01), Asher
patent: 4511769 (1985-04-01), Sahakian et al.
patent: 4527030 (1985-07-01), Oelsch
patent: 4590342 (1986-05-01), Schlegel
patent: 4678880 (1987-07-01), Koizumi et al.
Bonmassari Gianpaolo
Gillio Claudio
Ing. C. Olivetti & C. S.p.A.
Scott J. R.
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