Construction of preset plate for VHF tuner

Details Construction of preset plate for VHF tuner Construction of preset plate for VHF tuner

1977-12-16

1979-11-20

Smith, Alfred E.

Tuners

With switching means

Disk-type turret tuner

334 51, 334 88, 200 11EA, H03J 502, H03J 100, H01H 1958

Patent

active

041752597

ABSTRACT:
Disclosed is a preset plate for a VHF tuner, having a first and a second rotary bodies which are unitarily mounted on a main shaft of the VHF tuner. The first rotary plate has a plurality of coils corresponding to respective channels to be selected and a number of switching contact pieces, while the second rotary body carries a plurality of fine-adjusting screws for getting into and out of the cavities of respective coils for varying the inductance thereof. Stationary contact members are fixed on the frame of the tuner for engaging the successive switching contact pieces as the preset plate is rotated around the axis of the main shaft. The second rotary body has a plurality of axially projecting portions located between each adjacent switching contact pieces for engaging the stationary contact member at a portion of the latter other than the contact area for electrical contact with the switching contact pieces, during the rotation of the preset plate, so as to move the stationary contact member away from the plane of the switching contact pieces, so as to avoid frictional sliding engagement of the switching contact pieces with the stationary contact member, thereby to avoid the wear of contacts and, accordingly, to improve durability of the preset plate.

REFERENCES:
patent: 3255319 (1966-06-01), Paine
patent: 3596013 (1971-07-01), Pihl

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