Electricity: circuit makers and breakers – Electric switch details – Actuators
Patent
1997-08-11
1998-11-03
Friedhofer, Michael A.
Electricity: circuit makers and breakers
Electric switch details
Actuators
200 5A, H01H 1370
Patent
active
058295798
ABSTRACT:
A key switch assembly includes a base board, a membrane circuit provided on the base board, an upright biasing member supported on the membrane circuit, a base plate, a scissors-type key cap support including first and second support levers, and a key cap. The first support lever is formed with an aligned pair of cylindrical outward pins. The second support lever includes parallel rods that are formed with an aligned pair of pin bores with downwardly opening entrances to permit extension of the outward pins fittingly and rotatably therein via the entrances so as to couple rotatably the first and second support levers at intermediate portions of the same. The second support lever is further formed with an engaging tab on the inner edge of one of the parallel rods. The first support lever is further formed with an engaging notch on one of the outer edges of the first support lever for receiving the engaging tab therein. The engaging notch has a predetermined width sufficient to limit pivoting movement of the engaging tab therein between a first position, where the key cap is in a non-depressed state, and a second position, where the key cap is in a fully depressed state.
REFERENCES:
patent: 5463195 (1995-10-01), Watanabe et al.
patent: 5504283 (1996-04-01), Kako et al.
patent: 5512719 (1996-04-01), Okada et al.
patent: 5630501 (1997-05-01), Tsay
patent: 5695047 (1997-12-01), Tanahashi
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