Patent GB-455357-A (GB)
Title: Regulating device for wireless receivers
IPC: H03J5/08
Filed: 1935-04-23
Abstract: 455,357. Adjusting wireless apparatus. GRILLET, F. J., La Belinette, Avenue do la Prevoyance, Caluire, Rhone, France. April 23, 1935, Nos. 12249 and 12250. Convention dates, April 23, 1934 and April 3, 1935. [Class 37] [See also Group XL] An arrangement for adjusting the tuning condenser of a wireless receiving set to receive any desired station comprises a series of keys having return springs and bearing the names of the stations, a movable window normally covering the keys, regulatable rods carried by the keys, and a movable carriage having a grid co-operating with the rods, the carriage being connected to the adjustable member of the condenser. In one arrangement, Figs. 1 and 3, the window b and carriage v carrying the grid u are mounted in slides c, the keys a being arranged in vertical rows behind the window. The window is normally retained in its upper position by a spring f acting through a lever e. On lowering the window to uncover the keys, the circuit of the receiver is opened by a switch g. The window then engages a knob w carried by the grid u and moves the latter clear of the rods r. In its lowermost position the window engages a lever h which moves a locking plate j to release any depressed key. The key bearing the name of the desired station is then depressed and held by the plate j, the corresponding rod r being thus moved into a position in which it acts as a stop on the return movement of the grid u and thus determines the adjustment of a pulley t mounted on the spindle of the tuning condenser, the rods r corresponding to the unoperated keys passing through holes in the grid. The keys corresponding to long wave lengths have extensions z co-operating with a plate k connected with the switch for long wave operation. In a modification, Figs. 4, 6 and 7, each key is stamped out from a plate 1 having a bent-over portion 2 bearing the name of a station, and tongues 6, 7 carrying the rods 8 which co-operate with the grid 12 carried by the carriage 44 which is slidably mounted on rods 50. The window 13 is movable horizontally on rods 14 and carries a pawl 16 co-operating with levers 25, 27 pivoted at 26 for setting the switch for long and short waves. An inclined plane 37, integral with the window 13, acts on a lever 38 to raise the locking plate 39 and release the depressed keys when the window is moved to change the reception. The carriage 44 is connected to the window by a rod 52 which engages a spring clip 54 carried by the window; normally the carriage moves with the window, but the spring clip allows the window to terminate its movement after the carriage has been stopped by the engagement of a rod 8, carried by a depressed key, with the grid 12. The carriage is connected by a cable 45 with a pulley 46 on the rotary shaft of the tuning condenser. One of the keys serves for hand regulation and, when depressed, engages a lever 40 and locks a rod 43 carried by the carriage between rollers 47, 48, by rotating which by means of a knob 49, the position of the carriage and therefore the adjustment of the condenser can be effected independently of the window. The carriage 44 may be connected by a pin 61 with a member 60 'co-operating with scales 58 and a sliding panel 62 to indicate the wavelength to which the set is tuned. The movements of the window 13 may be controlled by an electric motor 71, Fig. 9. Momentary closure of a switch 72 closes the circuit of the motor, which is maintained closed for half a revolution of the wheel 70 by a cam 73, in order to open the window. The circuit of the motor then opens, but operation of any of the keys 2 again closes it, and the wheel makes another half revolution to close the window, the circuit of the motor being then opened by a cam 74 at contacts 76. If no key is depressed, the motor can be set in rotation to close the window by pressing a button 77.