Electricity: circuit makers and breakers – Electric switch details – Cases and bases
Patent
1993-12-01
1995-07-04
Recla, Henry J.
Electricity: circuit makers and breakers
Electric switch details
Cases and bases
200341, 200345, 2003021, H01H 1306
Patent
active
054302676
ABSTRACT:
In a keyboard switch that switches on and off by sliding a key stem, the key stem is slidably inserted in a key stem sleeve that is integral with the housing of the keyboard switch. The key stem comprises a sliding member integrally formed therewith and a keytop support whose shape is a wide flange formed integrally with and projecting outwardly from the outer periphery of the sliding member. An elastic hollow cylinder has one end hermetically joining the lower face of the keytop support and its other end hermetically joining the outer periphery of the key stem guide sleeve. With this structure, there can be no gap between the sliding member and the keytop support, so the interior of the keyboard switch is kept completely free from dust and moisture.
REFERENCES:
patent: 4806908 (1989-02-01), Krupnik
patent: 5145058 (1992-09-01), Lee
patent: 5306886 (1994-04-01), Yamada
Ozeki Kumio
Sakai Yosuke
Watanabe Fumio
Yoshida Haruo
Kohli Vineet
Morrison Thomas R.
Recla Henry J.
SMK Corporation
Walczak David J.
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