Keyboard having connecting parts with downward open recesses

Details Keyboard having connecting parts with downward open recesses Keyboard having connecting parts with downward open recesses

1992-10-28

1994-01-11

Luebke, Renee S.

Electricity: circuit makers and breakers

Electric switch details

Actuators

H01H 312

Patent

active

052783723

ABSTRACT:
A first support lever having an upper end provided with a pair of pivots at the opposite side ends thereof and a lower end provided with a pair of pivots at the opposite side ends thereof, and a second support lever having an upper end provided with a pair of pivots at the opposite side ends thereof and a lower end provided with a pair of pivots at the opposite side ends thereof are pivotally joined together in a scissors-like form. The pivots of the respective upper ends of the first and second support levers are connected movably to the lower surface of a key, and the pivots of the lower end of the first support lever are received pivotally in downward open, substantially round recesses formed in a base plate at positions in the opposite corners of one end of an opening formed in the base plate. The pivots of the lower end of the second support lever are received slidably in downward open, elongate recesses formed in the base plate at positions in the opposite corners of the other end of the opening. The pivots of the lower ends of the first and second support levers can easily be fitted in the corresponding substantially round recesses and elongate recesses from under the base plate.

REFERENCES:
patent: 3174685 (1965-03-01), Swanson
patent: 3857007 (1974-12-01), Leuenberger
patent: 4433225 (1984-02-01), Cowles
patent: 4560844 (1985-12-01), Takamura et al.
patent: 4560845 (1985-12-01), Takamura et al.
patent: 4580022 (1986-04-01), Oelsch et al.
patent: 4735520 (1988-04-01), Suzuki et al.
patent: 4902862 (1990-02-01), Oelsch et al.

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