Force controllable shielded mechanical switch actuators

Details Force controllable shielded mechanical switch actuators Force controllable shielded mechanical switch actuators

1995-10-06

1997-05-06

Walczak, David J.

Electricity: circuit makers and breakers

Electric switch details

Cases and bases

200341, 2003022, H01H 902

Patent

active

056262221

ABSTRACT:
A mechanical switch in a laptop computer or other electronic equipment is surrounded by a protective, electrostatically shielding bellow-shaped housing that is formed from a nickel metal. Preferably formed by casting, the bellows has a sidewall thickness of about 0.06 mm to about 0.12 mm, a diameter ranging from about 2.6 mm to about 10 mm, and a compressive actuation displacement ranging from about 2 mm to about 8 mm. The number, shape and thickness of convolutions or pleats comprising the bellow may be designed to tailor the actuation force vs. actuation travel stroke transfer function. A substantially linear transfer function is achieved by providing a constant thickness housing wall and a constant convolution pitch. The housing produces good protection against water and dust, good tactile feedback, yet is cost and weight competitive with prior art rubber housings.

REFERENCES:
patent: 3238344 (1966-03-01), Miachon
patent: 3950628 (1976-04-01), Hruda
patent: 4235427 (1980-11-01), Bialobizeski
patent: 4243857 (1981-01-01), Reis
patent: 4453061 (1984-06-01), Tamura
patent: 4540864 (1985-09-01), Krasser et al.
patent: 4596912 (1986-06-01), Hattori
patent: 4766272 (1988-08-01), Guzzon
patent: 4922066 (1990-05-01), Crow et al.
patent: 5311912 (1994-05-01), Hayward

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