Linear feel keyswitch with hysteresis

Details Linear feel keyswitch with hysteresis Linear feel keyswitch with hysteresis

1982-09-15

1984-06-05

Shepperd, John W.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

200340, 200DIG1, 340365C, H01G 516, H01H 312

Patent

active

044531982

ABSTRACT:
A capactive keyswitch utilizes an arrangement of three spring forces to provide a linear feel, hysteresis, and overtravel. A telescoping plunger assembly includes an outer plunger shaft and an inner plunger shaft slideably mounted therewithin for telescopic extension therefrom. A first spring provides a return force to maintain the keyswitch in its non-actuated condition. A switch actuator is coupled to the inner plunger shaft and includes a resilient foam pad (second spring) to provide resilient contact with a switching element when the plunger is moved to an actuated position. A third spring between the outer plunger shaft and the switch actuator urges the switch actuator, and thereby the inner plunger shaft, into its fully extended position.

REFERENCES:
patent: 3582594 (1971-06-01), Twyford
patent: 3773997 (1973-11-01), Evans et al.
patent: 3777082 (1973-12-01), Hatley et al.
patent: 3780237 (1973-12-01), Seeger
patent: 3856998 (1974-12-01), Sims
patent: 3965399 (1976-06-01), Walker et al.
patent: 3993884 (1976-11-01), Kondur et al.
patent: 4090229 (1978-05-01), Cencel et al.
patent: 4129758 (1978-12-01), Gilano et al.
patent: 4156802 (1979-05-01), Gilano et al.
patent: 4207448 (1980-06-01), Furusawa et al.
patent: 4274752 (1981-06-01), Huber et al.
patent: 4325102 (1982-04-01), English

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