GB305327A - Improvements in electrically driven timepieces - Google Patents

Abstract

305,327. Bold, H. Dec. 10, 1927. Electric clocks.-In an electric clock in which a weighted driving arm pivoted on the minute wheel arbor, is re-energized electromagnetically, indicator means connected to the weighted arm are provided to show when the electromagnetic force is insufficient to raise the weight. The driving arm 11, weighted at 13, is pivoted at 7 on the minute wheel arbor and carries a pawl 14 driving the ratchet wheel 8 rigid with the arbor 7 and connected by gearing 1 - - 6 with an escapement which is controlled by a pendulum or by a balance. The weight is connected electrically in series by a wire 16 with the magnet windings 17 and contacts, to close the magnet circuit, with a surface 24 on a bell-crank 20, 21 pivoted at 22 and carrying the armature 23. A stop 27 limits the downward movement of the arm 20. When the weighted lever sinks the weight 13 contacts with the surface 24 and the magnet rocks the bell-crank 20, 21 clockwise so that the weighted lever is kicked upwards by the surface 24. A two-armed indicator member 31, 35 pivoted at 32 to the fixed frame of the clock is connected by a pin and slot 33, 34 to the weight 13 so that when the arm 11 is in its lowest position a red dot 37 on the indicator member shows through a hole 36 in the front plate of the clock and through a hole in the dial. In a modification, the bell-crank carrying the armature is pivoted at one end.