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US 4,128,821 AGranted
Turret type television tuner
AssigneeNew Nippon Electric Co., Ltd.
InventorsKazuo Kato, Michiaki Narihiro
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AssigneeNew Nippon Electric Co., Ltd.
InventorsKazuo Kato, Michiaki Narihiro
Estimating the term…
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.
A turret type tuner comprising a chassis assembly including a front wall means, rear wall means, and side wall means, a plurality of external connecting terminals operatively secured to said wall means, a rotor assembly including turret means, and selector shaft means, detent biasing means on said selector shaft means, and a plurality of coil units operatively arranged in said rotor assembly, a stator assembly including a stator bar and a plurality of spring contacts as well as a tuner circuit means including electrical circuit elements, a shield plate and printed circuit board means electrically and mechanically connected to said spring contacts and to said electrical circuit elements, bearing fitting means provided in said chassis assembly to mount said rotor assembly and said stator assembly, and torsion bar spring means having interconnected first and second arm means forming bearing means and a detent drive for said selector shaft means, said detent drive employing the torsional force of said torsion bar spring means, said bearing fitting means comprising notch bearing means formed in said front wall means and indent bearing means formed on said selector shaft means, said indent bearing means being located in said notch bearing means and wherein said torsion bar spring means is operatively arranged to apply pressure to the selector shaft means in said indent bearing means at the inside of said front wall means through said first arm means of said torsion bar spring means.
Dependencies are inferred from the claim text.