Low profile microswitches, particularly useful for the compositi

Details Low profile microswitches, particularly useful for the compositi Low profile microswitches, particularly useful for the compositi

1980-08-05

1982-10-05

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200275, H01H 1370

Patent

active

043529631

ABSTRACT:
A keyboard unit is shown having a substrate in which portions of the substrate are physically displaced to provide a cavity, an embossment and a plurality of protuberances for each switching station. The embossment, in registry with a button contact area, projects upwardly from the floor of the cavity a selected distance with a discontinuance annulus contact area extending around its respective cavity in generally the same plane as that in which the top surface of the substrate lies. The cavity includes a channel shaped portion extending through the discontinued portion of the discontinuous annulus. The protuberances project upwardly from the general plane of the substrate's top surface and serve to laterally locate a snap-acting disc over the contact areas. The disc may be selectively coated with highly electrically conductive material to optimize electrical switching. A piece of flexible, electrically insulative sheet may be placed over the unit to seal it from the environment.

REFERENCES:
patent: 3967084 (1976-06-01), Pounds
patent: 3995128 (1976-11-01), Hawkins
patent: 4046981 (1977-09-01), Johnson et al.
patent: 4074088 (1978-02-01), Keough et al.
patent: 4254309 (1981-03-01), Johnson

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