Patent GB-355653-A (GB)
Title: Improvements in remote control for radio apparatus
IPC: H03J1/22
Filed: 1930-04-11
Abstract: 355,653. Remote control systems. SLEEPER RESEARCH LABORATORIES, Inc., 416, West 33rd Street, New York, U.S.A. April 11, 1930, No. 11600. Convention date, June 25, 1929. [Class 40 (i).] Apparatus for the remote control of wireless sets comprises a control member, for example, a commutator switch 24, Fig. 2, adapted to operate a step-by-step motor 10 which acts to cause the rotation of a tuning device of the set. In the construction shown in Figs. 2, 3, and 5, the spindle 14 for varying the condenser settings is connected through gearing to the shaft of the motor 10, which is connected, as shown, to the brushes of the switch 24. The switch is mounted on a shaft 46 carrying a friction cone 48 and a pinion meshing with a gear wheel 50 on a shaft provided with a dial 52. The gearing at the set and at the control point is such that the dials 52, 74 have substantially similar angular movement. The shaft 46 is rotated when a handle 54 is pressed inwardly and rotated, the friction cone 58 then engaging the cone 48. The inward movement of the handle is adapted to close a switch 42 to complete the circuit through certain of the motor windings. The wireless set may be switched on and off by means of a toggle switch 68, operated by an arm 70 when the dial 74 moves below the zero mark. In order that the set may be re-tuned from a second remote point without being switched off, means are provided whereby the reading of the dial at this remote point can be made to correspond with the reading of the dial 74. Both dials are provided with stop means effective when the dials indicate 100‹, and preferably also stop means are provided for the switching-off position. At the set the dial 74 is provided with two abutments 78, 80 adapted to co-operate with a stop 76. At the control point the dial 52 has an enlarged portion forming abutments 84, 86 for co-operation with a flange 88 carried by a spring-pressed pin. To bring the dials into agreement, the dial 52 is rotated until it reads 100‹. The pin 90 is then pushed in to clear the abutment 84 and the dial is rotated through a complete revolution until it again reads 100‹. Meanwhile the dial 74 has been rotated by the motor 10 until it reads 100‹ when it is stopped by the abutment 78, the motor slipping while the dial 52 completes its movement. Instead of the motor 10, a resultant field motor may be employed, for use with alternating current. In the modification shown in Figs. 7 and 9, the motor 10 is connected through gearing 17 to a disc 15 loosely mounted on a shaft 14<1> to which are fixed the rotor plates 19 of a condenser and a disc 23 attached to a dial 741. Each of the discs 15, 23 has a notch adapted to receive a bent arm 25 on a spring- pressed lever 27. A fixed arm 27<1> is adapted to engage the lever 27 before the condenser plates reach the limit of their rotation in one direction, so that the discs 15, 23 become disconnected. Further movement of the disc causes the operation of the toggle switch 68 to switch off the set. Reverse movement closes the switch and re-connects the discs 15, 23. Means are provided to limit in both directions the dials at the set and the control point, and these dials are brought into agreement, when necessary, by rotation of the remote control dial first to one limit and then to the other. In the construction shown in Fig. 11, the motor 10<1> comprises a pair of ratchet wheels 43, 45 co-operating respectively, with electromagnetically-operated pawls 49, 53, which are adapted to drive the shaft 47 in opposite directions. The direction is determined according to whether contact 71 or 73 is engaged by an arm 67 which has frictional contact with a control disc 61. This disc has a series of insulated contact points 63 adapted to co-operate with a member 65 connected through a source of power to magnets 57, 59. In a modification, Fig. 12, the rotary control is replaced by a straight line control, the contacts 63<1> being fixed and cooperating with a wiper 651 pivoted on a slide 75. The upper end of the wiper is adapted, on movement of the slide, to engage one or other of contacts 81, 83 which are connected respectively to the magnets of the motor. Devices similar to those used for controlling the tuning of the set may be used for controlling the volume.