Turret type television tuner

Details Turret type television tuner Turret type television tuner

1977-03-29

1978-12-05

Gensler, Paul L.

Tuners

With switching means

Drum or cylinder-type turret tuner

74 1041, 74 1085, 334 57, 334 88, H03J 530

Patent

active

041288211

ABSTRACT:
The present turret type television tuner comprises a U-shaped chassis having first and second end walls joined by a side wall. A main channel selecting shaft is supported in said end walls. A toothed index wheel is mounted on the selector shaft adjacent the first end wall. A fine tuning shaft is mounted concentrically around the selector shaft. A fine tuning drive includes a first driving gear mounted concentrically on the fine tuning shaft and a second driving gear mounted on a pivotally mounted member on the second end wall. A coupling clutch permits a fine tuning operation. A torsion bar spring member including a bail portion is mounted on the first and second end walls, whereby a first resilient arm of the spring member extends along the first end wall to engage the toothed index wheel, while a second resilient arm portion extends along said second end wall to engage the selector shaft and bias it against its bearing surfaces. A rotatable turret includes a plurality of coil units and supporting discs fixed on said main shaft. Each of the coil units includes an elongated bar and coils making up a tuned circuit for each stage. The inductance of at least one of the coils is adjustable for fine tuning. A stator includes a printed circuit board and a stator bar having a plurality of spring contacts cooperating with selected coil units. The second resilient arm of the spring member provides a bias force against the selector shaft in a direction opposite to that of the spring contacts of the printed circuit board on the stator.

REFERENCES:
patent: 3210700 (1965-10-01), Krepps, Jr. et al.
patent: 3365621 (1968-01-01), Von Fange et al.
patent: 3407669 (1968-10-01), Valdettaro et al.
patent: 3477299 (1969-11-01), Speer et al.
patent: 3944952 (1976-03-01), Badger
patent: 4052675 (1977-10-01), Valdettaro

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