Calculator type keyboard including printed circuit board contact

Details Calculator type keyboard including printed circuit board contact Calculator type keyboard including printed circuit board contact

1980-03-26

1983-02-22

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

29622, 200159B, 200275, 200292, H01H 1370, H01H 100, H01H 1104

Patent

active

043750176

ABSTRACT:
A switch mechanism useful in a calculator type keyboard includes a printed circuit board conductor in which is punched a crater-like depression with a raised edge portion and a dome-like member positioned so that its apex may contact the raised edge portion when the switch mechanism is depressed. The punched crater-like depression is specifically formed by striking the printed circuit board conductor to form an edge extending above the predetermined height of the conductor surface, which in turn, is disposed above the planar surface of the dielectric substrate.

REFERENCES:
patent: 2722584 (1955-11-01), Skag
patent: 3024334 (1962-03-01), Rhodes
patent: 3714384 (1973-01-01), Burkhardt et al.
patent: 3749859 (1973-07-01), Webb et al.
patent: 3806673 (1974-04-01), Boulanges
patent: 3886341 (1975-05-01), Forrest
patent: 3922814 (1975-12-01), Runft
patent: 3967084 (1976-06-01), Pounds
patent: 3973091 (1976-08-01), Kaminski
patent: 3996429 (1976-12-01), Chu et al.
patent: 4046981 (1977-09-01), Johnson et al.

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