GB252150A - Improved means for synchronizing clocks - Google Patents

Abstract

252,150. Junghans Akt.-Ges., Geb. May 12, 1925, [Convention date]. Controlling clocks. - In an electric clock which is connected periodically by waves from a distant wireless station, the synchronizing mechanism is arranged to be actuated only by the time signal from the particular station and not by ordinary messages on the same or other wave-length. The minute hand has rigid with it a heart-shaped cam c coacting with a roller b<3> on a pivoted arm b having a segmental rack extension b<1> which co-operates with the gearing b<2> of a fly regulator. A rod e is pivoted to the arm b and to a detent member f which is rotated counter-clockwise by a differential a driven from the mainspring when a. member g is lowered, this member carrying the armature of a magnet d which is energized at synchronizing. Thus, when the latter occurs, the rod e is drawn down and the roller b<3> positioned in the cam c to set the minute hand to its correct position. The fly regulator retards the upward stroke of the rod e to ensure that the detent member f shall not complete its rotation before the member g has risen again to lock it. A receiving magnet 1 has an armature rigid with a spring-controlled lever 3 which carries a pin engaging the spring 4 of a balance 2 which oscillates once each second. At the particular wave-length ordinary messages will energize the magnet 1 at irregular intervals and through the lever 3 and its pin thus will clamp the oscillations of the balance, but when the time signal is received at one-second intervals the pin on the lever 3 will move in consonance with the balance, the oscillations of which are thereby amplified to enable a pin 19 on the balance to function correctly as set out below. The lever 3 is connected by a link 6 and pawl 7 to a governor 8 which provides for rapid acceleration of the balance when the time signal is received. Rigid with the minute hand is an arm 9 having a pin which moves a twelve-toothed wheel 10 one tooth per hour. This wheel carries a pin 11 so positioned that four minutes before the time signal commences a lever 12 is rocked to release an arm 14 rigid with a shaft 15 and an arm 13, which latter thereby falls to close contacts 16 in the circuit of the magnet 1. At the same time an arm 17 rigid with the shaft 15 is moved to place a contact arm 18 which it carries in the path of the pin 19 so that the latter in oscillating fully at the time signal moves the arm 18 to make contact at 18<a> thereby completing the circuit of the magnet d. When the roller b<3> is lowered an arm b<4> rigid with the arm b is moved over to return the arms 13, 17 which are then latched up by the return of the lever 12 under the arm 14. A safety device is provided for returning the arms 13, 17 if the arm b<4> fails to do so.