Patent GB-1394935-A (GB)
Title: Pushbutton radio tuner device
IPC: H03J5/06
Filed: 1973-01-29
Abstract: 1394935 Latches MOTOROLA Inc 29 Jan 1973 [1 Feb 1972] 4348/73 Heading E2A [Also in Divisions F2 and H3] In a push button radio tuner device having cores 40, Fig. 2 attached to a movable carriage 32 for movement with respect to coils 28, push button mechanisms 14 are mounted for movement between a neutral position and released and depressed positions each for moving the core carriage to predetermined positions, a memory bar 114a or 114b is associated with each push button mechanism, a respective core carriage driving mechanism 174, 166, 168, 142, 144 is associated with each push button mechanism and each driving mechanism is engageable with the core carriage and an associated memory bar for moving the carriage into position on depression of a push button. The tuner device further includes memory assemblies 116 for re-locating a corresponding memory bar 114a or 114b to change the preselected wave signal corresponding to each bush button mechanism, each memory assembly comprises a U shaped clamping spring 116 for maintaining the memory bar 114a 114b at a position corresponding to the predetermined position. The clamping spring 116 is normally expanded to hold the associated memory bar in position and is compressed on movement of the push button mechanism from the released to the depressed position to permit movement of the memory bar into position with respect to the core carriage 32, and the clamping spring 116 is expanded for re-engagement with the memory bar 114a or 114b subsequent to the movement of the push button mechanism from the depressed position to the neutral position. In the push button tuner shown in Fig. 2 to reset a push button the push button housing 133 is lifted so that a tab 132 releases lever arms 128 130 as shown for button 14b, Fig. 4. On pressing the button as shown for button 14c the lever arms 128, 130 engage a U shaped clamp 124 which acts to compress the U shaped clamping spring 116 so as to release one or other of two memory bars 114a or 114b depending on the position of a waveband selector plate 112 which may be slid between two positions such as AMFM by pivoting a knob (19, Fig. 1 not shown). Also when the push-button 14 is pressed it drives rack members 142, 144 in opposite directions via gears 174, 166, 168 so that projections 136, 138 clamp on the end of the released memory bar 114a and projections 146, 148 clamp on projections (70, Figs. 10 and 11, not shown) on the underside of the carriage 32. Torsion springs (74) are associated with these projections (70) to take up slack between the projections (70) and the clamps 146, 148. By moving the manual tuning control (18, Fig. 1 not shown) the carriage 32 and memory bar 114a can be moved to a new position. When the button 14d is released to the position shown for button 14e the spring clamp 116 expands to engage the memory bar 114a and hold it in the new selected position. When the button housing 133 is lifted to select a new position a plate 228 (disclosed in more detail in Fig. 8, not shown) becomes disengaged from a manual declutch plate 210 so as not to declutch the manual tuning when the button is then pressed. However when pressing a button which has its memory bar 114 set to a stored station the plate 228 engages the manual declutch plate 210 so as to declutch the manual tuning and enable the gears 174, 166, 168 to drive the rack members 142, 144 towards each other so as to move the carriage 32 until the projections 136, 138 clamp on the set memory bar 114. The carriage 32 is mounted on brackets 42, 44 which slide by means of rollers 48 along rails 64, 66. In a radio having a single waveband only one memory is required for each push button.