Patent GB-1192119-A (GB)
Title: High-frequency Receiver Tuning Devices
Inventor: OHASHI TAMAKI
IPC: H03J1/08
Filed: 1968-11-08
Abstract: 1,192,119. R.F. Couplings; push-button mechanisms. T. OHASHI. 8 Nov., 1968 [11 Nov., 1967], No. 53160/68. Headings H3Q and H4A. In a radio receiver tuning device a selector switch S, Fig. 1, enables any one of aerials A 1 , A 2 , A 3  to be connected to one side of a variable matching capacitor C. Other sides of the capacitor C are connected to the inputs of frequency changers B 1 , B 2 , whose outputs may be connected by a selector switch S<SP>1</SP>, which is ganged with the capacitor C, to the input of a frequency changer D. As described the capacitor C has a rotatable vane (C o ), Fig. 5 (not shown), which at minimum capacitance lies between two pairs of fixed vanes (C 1 ) and (C 2 ). Rotation of the vane (C 0 ) into the pair of vanes (C 1 ) or (C 2 ) provides matching between the aerial in use and the converter B 1  or B 2 . Push-button tuning unit.-This comprises a frame G, Fig. 2, carrying three crank members F 1 , F 2 , F 3 , each consisting of a pair of rods extending between spindles which project from opposite sides of the frame. The members F 1 , F 3  are coupled to the ganged capacitor C/selector switch S<SP>1</SP>, and to the selector switch S, respectively, and may be rotated by pushing and turning buttons 26, when bevel gears H 1 , H 3  are engaged and operated. The member F 2  is coupled to a capacitor arrangement C<SP>1</SP>, which comprises the converter capacitors C<SP>1</SP> 1 , C<SP>1</SP> 2  shown in Fig. 1, and may be rotated through gearing by a knob 31 when a clutch 35 is engaged. Tuning members I are provided which are operable by push-buttons, and which can each register the positions of the rods of the crank members F 1 , F 2 , F 3  when set for the reception of a particular station, and, thereafter, can reproduce those settings when required. A tuning member I, Fig. 3, comprises three subsidiary tuning members I 1 , I 2 , I 3 , and is movable slidably between front and rear portions g<SP>1</SP> and g of the frame G against springs 22, 23 by pushing or pulling a button 18. The member I 1  comprises an elongate arm 1 mounted at one end on a guide rod 2 and carrying segmental setting plates 4, 8 rotatably attached by pins 3, 7 for engaging respectively with the rods of the crank members F 1 , F 3  (Fig. 2). Locking is effected by a spring loaded member 5, which is operated by a wedge 6 so that the plate 4 and the wedge itself are held in position, and by a tongue 14 which enters a slot in the plate 8 (Fig. 4, not shown). The member I 2  comprises an elongate arm 1<SP>1</SP> mounted at one end on a guide rod 2<SP>1</SP> and carrying a segmental setting plate 4<SP>1</SP>, similar to the plate 4, for engaging with the rods of the crank member F 2  (Fig. 2). Locking is effected by a spring loaded member 5<SP>1</SP>, which is operated by a wedge 6<SP>1</SP>. The tongue 14 is directly mounted upon an arm 10, which is a part of the subsidiary member I 1 , and the wedge 6 is mounted through a stud 12 on the said arm. The wedge 6<SP>1</SP> is mounted upon an arm 10<SP>1</SP>, which is a part of the subsidiary member I 2 , in a similar way to the wedge 6 upon the arm 10. The settings of the rods of the previously mentioned crank members F 1 , F 2 , F 3  may be transferred to the setting plates 4, 4<SP>1</SP>, 8 by depressing the button 18 and may then be registered by locking the said setting plates by a further depression of the said button. The rods may be re-set thereafter by depressing the button 18. The setting plates may be unlocked by pulling the button 18. The setting plates 4<SP>1</SP> may be re-set without disturbing the setting plates 4, 8 after inclining the button 18 towards the member I 2 . An arm 16 on which the said button is mounted is spring-loaded so that it returns to the central position thereafter.