Patent GB-224337-A (GB)
Title: Improvements in time pieces or master clocks influenced by electric waves or impulses for electrically operating secondary clocks
IPC: G04C1/06
Filed: 1923-09-15
Abstract: 224,337. Schneider, F. Sept. 15, 1923. Electric clocks. - A master clock &c. is controlled by wireless emanations, the receiver current being only closed in time for the reception of the signal and should the signal fail to arrive the movement is maintained by a safety circuit closed bv a rotating switch disc. The minute wheel 3, Fig. 1, is driven bv the spring 5 which is rewound each minute by the motor 30 and pulleys and train 29, 26, 24, 19, 17, 16, 15. The power circuit is established by the clapper 45 which is released each minute by the cam 8 fixed on the wheel 9 of the escapement train 9 - - 13. The clapper releases the catch 41 from the spring-pressed lever 40, the circuit 39, 37, 35, 34, 31, 30, 32, 33 being thereby closed through the frame 2. During the working of the motor 30 a pin 23 on the wheel 19 releases the spring-pressed stop 48 from the pivoted armature 52 of the magnet 56. The armature falls by its own weight, and a spring extension 53 thereon frictionally holds the escapement wheel, the clock being thereby stopped, till restarted bv 'the withdrawal of the armature and its spring on reception of the time signal. The motor train also during its motion operates the spring-pressed clapper 75 by the pin-wheel 17, which on release knocks on the coherer 66 to prepare it for the reception of the signal. The cam 20 during its rotation closes the receiver circuit 20, 91, 59, 56, 58, 66, 63, 71, 72, 2 and on reception of the signal the armature 52 is withdrawn from and starts the escapement and clock train going. Further rotation of the cam 20 closes the contacts 92, 93 and establishes the auxiliary circuits 20, 91, 92, 60. 62, 63, 61, 93 in parallel with the coherer circuit so that should the signal fail the movement will be maintained. The arm 22 rotating with the switch disc 20 depresses the lever 40 and breaks the contact 39, 37 of the motor circuit, the lever 40 being automatically locked by the spring catch 41. The gear ratios of the motor train are so chosen that the spring is rewound sufficiently for one minute's going and the tappet 90 makes a halfrevolution and closes the forward or reverse secondary clock circuit 90, 85 or 90, 86, the hands being moved forward one minute in the secondary clocks 84. To prevent sparking in the secondary clock circuit and consequent disturbance of the receiver, an additional circuit including coherer-resistance with flake filling is closed before the operation of the main secondary circuit. The insulated tappet 90 and disc 89, Fig. 6, carry pins 98 - - 100 on rotation of which first the contact 85, 87 is broken. The pin 98 subsequently contacts with the spring 101 and closes the circuit 79, 80, 121, 104, 90. 101, 106, 107, 108, 122, 83, 84, 82, 86 - - 88, 78 which includes the coherer resistance 107 preventing actuation of the clock. Subsequently the tappet 90 contacts with the spring 85 and the additional circuit 79, 80, 104, 90, 85, 83, 84, 82, 86, 87, 120, 78 is closed and the clock 84 driven. The tappet 90 by continued rotation through 180‹ operates on the springs 102, 86 to close the reversed circuits and again to drive the secondary clock. The resistance circuit is maintained closed after the main circuit is opened by the pin 98 contacting with the spring 101. Resistances may also be introduced at the collector terminals of the motor and at the contact 39, 37. A weight or spring motor may be used in place of the electromotor 30, the motion being stopped bv means of a friction brake acting on a fly-wheel in the train, said brake being lifted by the movement of the arm 40.