US1732688A - Combined signal system - Google Patents

Description

Get. 22, 1929. E. B. MALLORY 1,732,688

COMBINED SIGNAL SYSTEM File d Aug. 25 1925 v 7 BY Patented Oct. 22, 19 2 9 UNITED STATES PATENT OFFICE EDWARD B. MALLORY, OF TENAIFLY, NEW JERSEY, ASSIGNOR TO EWESTINGHO USE ELECTRIC & MANUFACTURING COMPANY, A GOBPORATIQN OF PENNSYLVANIA.

COMBINED SIGNAL SYSTEM My invention relates to a system for broad-- casting signals controlled by the time of day.

Broadly stated,it is an object of this invention'to control, by broadcasting methods, devices which have hitherto been controlled by clocks.

More specifically stated, it is an object of this invention to broadcast signal radiations the wave lengths of which vary with the time of day so that any receiving apparatus, being tuned to proper wave length, will be energized by the wave radiated by the broadcasting system'when the predetermined time of day arrlves. Y

The invention also includes providing for an adjustment of the tuning of the receiving apparatus whereby the time of day at which it will be energized may be changed at will. It is another object of the invention to provide a dial such that this change in the adjustment of the receiving device can be automatically made by merely indicating the desired time of day on the dial.

Other objects of my invention, as well as details of construction, will be made more apparent by the following description when taken in connection with the accompanying drawing wherein: I

Figure 1 is a diagrammatic a sending station, and

Fig. 2 is a similar View of a receiving device.

In Fig. 1, an antenna 1 is used to indicate the broadcasting system. It is, however, to

illustration of be understood that radio waves guided by power lines, orb telephone lines or in any other way, could used as'well as the space radio apparatus illustrated.

The sending apparatus includes a vacuum tube 2 with any usual or convenient system of connections enabling it to maintain oscillations. For example, there may be coil 3 inductively related to a coil 4 in the grid circuit and the power for both coils may be obtained from a battery 5. An inductance coil 6 maintains the current of battery 5 steady while the grid, under the influence of coil 4, causes fluctuations in the impedance of the tube 2. Oscillations are thus caused in the circuit including coil 3 and condenser 7. The coil 3, acting on coil 4, causes fluctuations on Application filed August 25, 1923. Serial No. 659,257.

the grid. The coils 3 and, 4 deliver energ to the antenna. The antenna, beside including the coils 3 and 4, also has a condenser 7 of an adjustable character. The adjustment of the condenser 7 co-operates with the coils 3 and 4 to determine the natural period of the antenna and so determines the wave length of the radiations.

The adjustment of the condenser 7 is controlled by any suitable time mechanism. This is diagrammatically indicated by showing a clock 8, the hour shaft 9 of which is connected by :an arm 10 and a link 11 to the adjusting mechanism of the condenser 7. As the clock rotates the shaft'9, the link 11 will be reciprocated and so will cause the condenser 7 to be adjusted, first in one direction and then in ing a rectifier 19 and any suitable translating device. In the practical use of the invention amplifying means would be associated with this circuit, since only unusually strong signals would actuate the translating devlce illustrated, but, as the invention is not concerned with the details of this circuit, the amplifier has not been shown. For illustration, the translating device is shown as an electromagnet 21. This can control any mechanism which it is desired to have operate at a predetermined time.

The'adjustment of condenser 18 is efl'ected by manually moving the hands of a clock dial 22. These hands are not driven by clock work but stay wherever the operator sets them. Any suitable connection between the minute hand and the hour hand that will cause them to move at proper relative speed is all the mechanism needed at the clock face 22. The

hour hand is connected by an arm 23 and link 100 circuit to syntonomy with the receiving circuit.

Atj five oclock therefore, the magnet 21 will be energized and the mechanism con trolled thereby will act. If it is desired that this mechanism act at some other time, the clock face 22 is adjusted accordingly.

It will be obvious that the invention is not limited to the specific mechanismillustrated,

' but that any time controlled device may be used for adjusting the condenser and that any broadcasting apparatus may be substituted for that illustrated. It will be obvious further that other methods of controlling the wave length of the signalling energy may be used beside the adjustment of a condenser. Although I have not shown all of the possible l'riodifications of my invention it will be apparent to those skilled in the art that and time-controlled means for actuating said wavelength-altering means at such speed that the number of cycles of change per day will be sufficiently small to enable the time of day to be recognized from observation of said wave-length.

In testimony whereof, I have hereunto subscribed my name this 18th day of August,

EDWARD B. MALLORY.

variouschanges may be made in the, apparatus illustrated Without departing from the v spirit and scope of my invention, as set forth in the appended claims.

I claim as my invention:

1. In an alarm system, means for generating and radiating oscillatory energy, meansfor so continuously altering the frequency of the radiated energy that a frequency is allocated to each time division" over a range of twenty-four'hours, the time divisions within the time-period corresponding to the complete range of frequencies, each having a different frequency allocated thereto, and the time-period corresponding to" the complete range of frequencies being so large a fraction of twenty four hours that the portion of the day corresponding thereto is easily identified, radiant energy reception means including instrumentahties for permitting the energization of an alarm device, and means for tuning said reception means to .any frequency 1n the range of the frequencies of said radiated energy, sald tuningmeans comprising a device that indicates the correlationof the tuning with the said time-divisions, whereby, by properly tuning said receiving device it may be pretuned to respond to said transmitted energy at any designated -.time-division, and. an alarm accordln ly given.

2. In a Sigma llng'sy'stem, set, means included thereinfor altering the wave-length sent out by said set, said means producing cyclic changes of wave-length a radio sending

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