Pushbutton switch

Details Pushbutton switch Pushbutton switch

1982-09-10

1984-05-08

Shepperd, John W.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 5A, 200153LA, H01H 1366

Patent

active

044476876

ABSTRACT:
A pushbutton switch, suitable particularly for keyboards of business machines substantially comprises a cup-shaped casing which may be made in two parts and has its cup edge side closed by a pushbutton. Against the side of the button, the upper end of a return spring is applied whose lower end bears against an angle leg of a contact member, and which is secured against buckling preferably by a holding member. Another angle leg of the contact member applies against a shank surface which is provided with a shoulder for permitting an abrupt tilting of the contact member upon pushing the button. Movable contacts may be provided on one or the other angle legs of the contact member. The fixed contacts are then located accordingly. The fixed contacts may be formed by end portions of connecting elements extending to the outside or by elements of a circuit board. To assemble the keyboard a plurality of such switch casings are manufactured integrally with a cover plate. Beneath the individual buttons, a base plate is provided preferably carrying the fixed contacts.

REFERENCES:
patent: 2894080 (1959-07-01), Herrmann et al.
patent: 3219776 (1965-11-01), Yerkovich
patent: 4186290 (1980-01-01), Matsuo
patent: 4319100 (1982-03-01), Tallody

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