Vernier control

Details Vernier control Vernier control

1978-10-16

1980-09-16

Albritton, C. L.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338123, H01C 1018

Patent

active

042232945

ABSTRACT:
A vernier control (10) with independent coarse and fine adjustments includes a track pattern (17) that is formed along three concentric rings on a single base (11). A horseshoe-shaped, low-resistance track (17a) extends around a segment of the inner ring and has a pair of termination tracks (17d, 17e) connected to its opposite ends and extending in reverse directions in opposite half-sections of the intermediate ring. A pair of high-resistance tracks (17b, 17c) are formed in opposite half-sections of the outer ring, each extending alongside a respective termination track (17d, 17e). A fine adjustment rotor (16) is journaled in the base (11) in the center of the track pattern (17), and carries a fine adjustment contact (15) that engages both a collector terminal (19) on the base (11) and the low-resistance track (17a). An annular contact carrier (12) is mounted for rotation around the rotor (16) and carries a pair of coarse adjustment contacts (13 ). Each coarse adjustment contact (13) electrically connects one of the termination tracks (17d, 17e) to its adjacent high-resistance track (17b, 17c). A control of this type may be employed in television sets for brightness, color and contrast adjustments.

REFERENCES:
patent: 2873336 (1959-02-01), Tassara
patent: 3564476 (1971-02-01), Barden
patent: 3597717 (1971-08-01), Kent
patent: 3676822 (1972-07-01), Slagg et al.
patent: 3898606 (1975-08-01), Dumas et al.
patent: 4050050 (1977-09-01), Nakanishi et al.
patent: 4075597 (1978-02-01), Peart

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