Thick film rotary switch

Details Thick film rotary switch Thick film rotary switch

1975-01-30

1976-07-20

Albritton, C. L.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

200 11G, 338137, 338162, 338167, 338184, H01C 1000, H01C 1006

Patent

active

039709868

ABSTRACT:
A housing having a central bore therein receives a rotor rotatably mounted therein and secured thereto having an enlarged round base portion. A thrust plate is mounted for limited axial reciprocation within a recessed opening in the housing concentric with the rotor and adjacent the rotor base. The rotor base and thrust plate are formed with cooperating detents and notches to provide indexing means for rotationally positioning the rotor. The internal recess of the housing and the exterior of the thrust plate are configured with matching shapes to prevent rotational movement therebetween, rotation of the rotor moving the detents from one pair of diametrically opposed notches to the next adjacent pair of said notches, while the thrust plate reciprocates against the action of a biasing means. The lower end of the rotor carries a contactor mounted for fixed rotation therewith and having a pair of downward extending arms. The lower end of the housing is closed with an end plate having a pair of outwardly extending output terminals. On the interior surface of the end plate are formed, by thick film technology, circuit elements made of conductive and resistive materials having portions arranged geometrically for contact with the contactor arms such that, dependent upon rotor position, selected ones or portions of the circuit elements having different predetermined resistive values are electrically coupled between the output terminals. Means are provided to limit rotor rotational position to a predetermined arc. The switch may be provided with internal sealing means to maintain the uncontaminated integrity of the switch and external sealing means for sealing by mounting the entire switch within another encapsulated electronic component.

REFERENCES:
patent: 3200208 (1965-08-01), Mastney

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