Patent GB-456050-A (GB)
Title: Method and device for regulating electric main clocks by means of electric waves
IPC: G04R20/00
Filed: 1935-01-28
Abstract: 456,050. Clocks. NAAMLOOZE VENNOOTSCHAP RADIOKLOK, 46, Raamsingel, Haarlem, Holland.-(Assignees of Isler, F. ; 5, Usteristrasse, Zurich, Switzerland) Jan. 28, 1935, No. 2775. Void [Abridged as open to inspection under Sect. 91 of the Acts, July 30, 1935]. [Class 139] The invention relates to electric clock systems in which, it is stated, the master clocks are synchronized by wireless during a short period, e.g. an hour or half-hour each day. Master clock ; automatic winding mechanism. The master comprises a main time indicator, the minute wheel 7 of which is driven by a spring in a barrel 4 under the control of an escapement 10 ... 13, and it is stated, an auxiliary mechanism driven by a spring in a barrel 122 under the control of a fly on shaft 125 geared thereto for operating contacts 85, 86 to drive the secondary clocks 84. Once each minute a cam 8 on the minute wheel shaft 9<1> raises and suddenly releases a hammer 45 which falls upon and rocks a spring-biassed bell-crank lever 42, a catch 41 upon which releases a lever 38. A spring 38a then rocks the lever 38 to close at contacts 37 the circuit of a winding motor 30, which through a clutch 148, 149 and gearing 136, 133, 134, 135, 128, 132 winds the spring barrel 122 which through a wheel 15 winds the main spring barrel 4. The lever 38 rocks a level 131 through arm 146 to remove a braking arm 145 from a braking disc 144 on the shaft of wheel 133 in the motor drive and the motor continues to run until an arm 22 rigid with a disc 120 rotating with wheel 128 depresses a projection 40 of lever 38 to open the motor circuit at contacts 37. At the same time the projection 147 of lever 131 engages a notch in disc 120, when the brake arm 145 stops the motor and the lever 38 is again locked by the catch 41. Geared to the wheel 128 in the motor drive is a wheel 16, rigid with a pin wheel 17 which through a wheel 89 rotates a cam 90 through 180‹ at each operation to operate the contacts 85, 86 actuating the secondary clocks 84. Shortly before the motor stops one of the pins 18 on the pin wheel 17 depresses the arm 111 of a lever 112. The arm 113 thereof is thereby raised from a brake disc 127 on shaft 125 and a locking pin 114 releases a disc 126a which is then driven by the spring in the barrel 122 under the control of its fly. A pin 23 on disc 126a rocks a lever 48 whereby a pin 51, Fig. 4, is released from a notch 48c in lever 48 and a lever 53 is rocked by a spring 49 to lock the scape wheel 10 until a magnet 57 is energized to reset the locking lever 53. The magnet 57 is normally energized when a cam disc 21 driven with disc 126a shorts contact arms 91, 92, 93. The balance wheel 13 is adjusted so that the master clock would, if uninterrupted, gain about twelve minutes each day, but owing to the stoppage thereof each minute the master clock loses from 5 to 10 seconds per day. Synchronizing. The magnet 57, Fig. 1, is also connected by leads 58 to contacts 105, 106, Fig. 2, in series with a coherer 66. The contacts 105, 106 are closed only during the synchronizing period by a hammer 104 actuated by a pin 102 on a 24 hour wheel of an auxiliary clock 84. During this time, provided the coherer is energized by a wireless wave, the circuit to the magnet 57 is controlled by contact arms 91, 92, which are shorted at each operation of cam disc 21 before the pin 23 operates to lock the scape wheel 10 so that the master runs uninterruptedly during synchronizing at a gaining rate. The synchronizing impulses are sent out from the central controlling station for only a short period during each minute to actuate the magnet 57 and the coherer is struck by a hammer 75 actuated by the pin wheel each minute to de-energize it. It is stated that two clocks are switched in by hand at the control station for transmitting synchronizing waves at substantially alternate half minutes for a duration of a second, one of which clocks gains half a second per minute and interact with the coherer to effect synchronism.