Low profile switch

Details Low profile switch Low profile switch

1983-07-12

1984-08-21

Shepperd, John W.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200153V, H01H 1352, H01H 312

Patent

active

044671601

ABSTRACT:
A low profile switch key has a base which slidingly supports a pushbutton. The pushbutton is slidingly engaged with a plunger body by a lost motion connection. The plunger body carries cams which control the flexing of contactors to make and break conductive connections with adjacent stationary contacts. A coil spring biases the pushbutton upwardly to its rest position. The sliding lost motion between the pushbutton and plunger body allows the pushbutton to slide by itself over an initial pretravel interval when it is pressed. At the end of the pretravel interval, the pushbutton strikes the plunger body and carries the body downward to complete the key stroke. The plunger body resists sliding movement and therefore provides a perceptible pressure point which indicates actuation of the switch. The stationary contacts and associated overlying cams are interlocked when the pushbutton is depressed to provide a relatively low switch profile with respect to the length of the key stroke.

REFERENCES:
patent: 3255333 (1966-06-01), Schuchard
patent: 3392250 (1968-07-01), Ziegler et al.
patent: 3715545 (1973-02-01), Long
patent: 3735058 (1973-05-01), Berry
patent: 3773997 (1973-11-01), Evans et al.
patent: 3777090 (1973-12-01), Muller
patent: 3940578 (1976-02-01), Pointon
patent: 3993884 (1976-11-01), Kondur et al.
patent: 4150272 (1979-04-01), Bruun et al.
patent: 4361743 (1982-11-01), Ayers

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