Keyboard apparatus

Details Keyboard apparatus Keyboard apparatus

1988-01-15

1988-11-22

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200340, H01H 1370

Patent

active

047867663

ABSTRACT:
The first example of a keyboard apparatus of the invention intends to prevent the inclination and shake of a key button by forming retaining claws so as to project downwardly at locations near the corners of the quadrangular key button. The second example intends to prevent to shake of a small-sized key button by arranging the retaining claws formed for the small key button on a diagonal line of the key button, thereby elongating the distance between the retaining claws. The third example intends to automatically adjust the center of the position of the key button by forming the portion to restrict the top dead point of a key button so as to have almost a complementary zigzag shape.

REFERENCES:
patent: 3728652 (1973-04-01), Nishikawa
patent: 3917917 (1975-11-01), Murata
patent: 4056701 (1977-11-01), Weber
patent: 4181826 (1980-01-01), Latasiewicz
patent: 4493959 (1985-01-01), Viebrantz

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