Patent GB-1190141-A (GB)
Title: Improvements in or relating to Pushbutton-Operated Radio Tuning Apparatus
Inventor: OHASHI TAMAKI
IPC: H03J5/12
Filed: 1968-04-19
Abstract: 1,190,141. Pushbutton radio tuning. T. OHASHI. 19 April, 1968 [20 April, 1967], No. 18588/68. Heading H3Q. [Also in Division E2] In a pushbutton radio tuning arrangement, depressing the pushbutton 26 causes arms 1, 2 to slide and move a tuning frequency setting plate 9, which is lockable against rotation by means 10-14, into engagement with a pair of rods d 1 , d 2  of a crank D and move a broadcast band setting plate 20, which includes a mechanism 18, 22 for rotating this plate, into engagement with at least one of a pair of rods C 1 , C 2  of a further crank C. The frequency of the selected button is obtained by rotating knob 41. This drives via universal joint 43, gearing 45, 39, clutch 36 and gearing 34, 35 the crank D to set the frequency of the receiver. The wave band is selected by rotation of the button 26 which is marked corresponding to the waveband (A, B, C, Figs. 12, 13, not shown) or by rotation of the rod 24 within the button 26 (Figs. 15 and 16, not shown). The rotation of the button and/or rod 24 drives via gearing 22, 18 the band setting plate 20, e.g. from the position shown in Fig. 4 to that shown in Fig. 6. By depressing the button 26 first the frequency setting plate 9 engages with the set rods d 1 , d 2  of the crank D; on further pressing the button a resilient plate 13 slides up a cam 14 to press-locking plate 12 on a resilient plate 10 which locks the frequency setting plate in position. Movement of the arm 2 continues until the pin 16 engages the end of the slot 25. During the locking period the band setting plate 20 moves the rods C 1 , C 2.  from the position shown in Fig. 4 to that shown in Fig. 6 so that the band switch G (Fig. 1) is changed. On removal of pressure on button 26, it returns to the dotted position, Fig. 6, without further affecting the tuning of the receiver. When a button is pressed a comb teeth rod 49 is moved to push a roller 47 which acts through lever plate 46 to separate the clutch plate 36 so that the crank D may be rotated by the locked plate 9. Also a resilient plate 63 is deflected to move a claw 64 out of a groove in a disc 60 so as to allow the wave change switch G to be changed. When the button is released the claw 64 secures the position of the wave change switch. The buttons 26 are returned by a spring 28. The plates 9, 20 and gear plate 18 may be semicircular or segments. One of the notches 19 in the plate 20 slides along a rod 7 (Fig. 6) when the button is pressed so as to support the plate 20 during engagement with the rods C 1 , C 2 . All of the pushbuttons can be used to receive medium wave or short wave bands. In a modification (Fig. 7, not shown), in which the gear plate 18 is smaller than the distance between rods d 1 , d 2  the gear plate and band setting plate 20 are mounted on the same axis as the frequency setting plate 9. Alternatively (Figs. 8 and 9, not shown), the gear plate 18 can form the band setting plate by having the notches 19 provided by cut out pieces 50 of the plate 18. The plate 18 is mounted between the rods d 1 , d 2 ; c 1 , c 2  and driven from rod 24 by additional gearing (51-54) mounted on the arm 2. In a further modification (Figs. 10 and 11, not shown), the band setting plate 20 has a resilient plate (55) with peripheral recesses (57) which are always kept in engagement with the rod 7 to provide click stops, prevent unnecessary rotation of the setting plate 20 due to vibration and provide correct alignment of rod 7 with notch 19.