Clock adapted to be synchronized by alternating current in a wireless manner

Claim 1

In combination with an electric clock and a transmitter, said clock having therein an electromagnetically operated mechanical oscillator with a predetermined natural frequency which is a selected whole number times the rated frequency of an alternating current network, said electromagnetically operated mechanical oscillator including actuating coil means therein, said transmitter that generates a carrier wave being installed at a location remote from the electric clock wherein said mechanical oscillator is provided, aerial means respectively being provided for effective relationship between said transmitter and said clock, modulating means in the transmitter, said transmitter being adapted to be connected to said network and including means operable to transmit said carrier wave at a higher frequency greater than that of audible sound and modulated by said modulating means effective with said network at a lower frequency which is said selected whole number times the frequency of the network, a receiver at the clock having an input end and an output end, a demodulating means in the receiver, said receiver being adapted to receive said modUlated carrier wave at said input end and including amplifier means operable to amplify and connected serially with said demodulating means to demodulate the wave to develop first pulses at said lower frequency at said output end, means connecting said output end of said receiver to said coil means to supply said first pulses thereto, a battery powered electric oscillator at said clock developing second pulses at said natural frequency of said mechanical oscillator and connected to said coil means, semi-conductor control means in circuit between said electric oscillator and said coil means normally disabling said electric oscillator, means lying between said coil means and said electric oscillator sensitive to the supply of an impulse signal in response to deviation of frequency of the network by a predetermined amount from the rated frequency thereof to enable said electric oscillator to operate, and comparing means comparing the frequency of said first pulses to the said natural frequency of said mechanical oscillator connected therewith and connected to supply a said impulse signal to said semi-conductor control means in response to deviation of said network frequency by a predetermined amount from the said rated frequency thereof, said receiver at the output end including a first transistor having the emitter-collector path in series with said actuating coil means and the base connected to receive said first pulses; said electric oscillator comprising a second transistor having the emitter-collector path in series with a portion of said actuating coil means and said battery; said semi-conductor control means comprising a third transistor having the remainder of said actuating coil means connected between the base and the emitter thereof, the collector of said third transistor being connected to the base of said second transistor and via a capacitor to the emitter of said third transistor and via a resistor to one side of said battery, said mechanical oscillator having magnet means linking said remainder of said actuating coil means to develop pulses therein during oscillation of the mechanical oscillator.