US2475578A - Radio and visual warning device - Google Patents

Description

July 5, 1949. w. s. HALSTEAD 2,475,578

RADIO AND VISUAL WARNING DEVICE Filed Feb. 8, 1945 7 Shets-Sheet l WILLIAM S. HALSTEAD INVENTOR 4 ATTORNEY July 5, 1949. w. s. HALSTEAD RADIO AND VISUAL WARNINQ DEVICE 7 Sheets-Sheet 2 Filed Feb. 8, 19.45

me mm Q ffii ffiii WILLIAM. s. HALSTEAD INVENTOR ATTORNEY W. S. HALSTEAD RADIO AND VISUAL WARNING DEVICE July 5, 1949.

Filed Feb. 8, 1945 7 Sheets-Sheet 5 W h l mmw w m lL w Du E mm m E ,www m wt w wv w at Q m u mm@ M w E l T3 w l l 8 31 1% H Ml l m 5053 mim M 1 L I Q a m @Q m 3 TTORNEY W. S. HALSTEAD RADIQ AND VISUAL WARNING DEVICE July 5, 1949.

Filed Feb. 8, 1945 7 Sheets-Sheet 6 RADIO 48 BEAM e- FIG. 8'

- (I-ooo o WILLIAM s. HALSTEAD INVENTOR AT TORN EY July 5, 1949. w. s. HALSTEAD 111mm AND VISUAL WARNING-mum 7 Sheets-Sheet 7 Filed Feb. 8, 1945 dm 50 1604 FEEmz E NOT .EDUEU Ud llvll ATTORNEY Patented July 5, 1949 RADIO AND VISUAL WARNING DEVICE William S. Halstead, Purchase, N. Y., assignor, by mesne assignments, to Farnsworth Research Corporation, a corporation of Indiana Application February 8, 1945, Serial No. 576,769

10 Claims.

This invention pertains to a radio signaling device, and more particularly to a device wherein a radiotelephone in combination with visual signaling means is provided.

Further, the invention pertains to a portable device which embraces a combination radiotelephone and electric spotlight or lantern, with the electric spotlight being capable of automatically flashing synchronously with a radio-emitted tone signal so that the device may be used as a radio and visual warning device either on vehicles such as trains or automobiles, or when used by individuals on the ground.

When the equipment is utilized as a safety aid, the operator may initiate operation of the device so that the radio transmitter will automatically emit a pulsing radio signal, and simultaneously flash a red light, which light is energized in synchronism with the pulsing radio signal. By this means, the engineer of a radio-equipped locomotive approaching such a device, either carried by a flagman 0n the ground or mounted at the rear of a preceding train, will receive the pulsing radio signal, and if the approaching locomotive is within the effective visual signaling range of the spotlight, the engineer will also see the pulsing light signal which will flash in synchronism with the pulsing radio signal.

Further, by means of the device two-way radiotelephone communications may be exchanged between the engineer of the approaching train and the fiagman of the preceding train after reception of the warning signal so that detailed intelligence can be conveyed.

In this application of the invention, which is illustrative of one of its uses on railroads as an aid in averting rear-end collisions between trains, the device of the invention may be removably .affixed to the last car of a train, with a remote control connection extending to the interior of the train.

In one modification of the invention, a radio wave reflector is affixed to the train and is so disposed that when the radio device is properly disposed in its predetermined operative position on the train, the radio wave reflector, such as a parabolic reflector, will reflect the signals rearwardly with respect to the train so that the engineman of a following train within eflective range of the device may receive the pulsing signal from the train ahead and simultaneously see a flashing light if within effective range of the light beam.

The spotlight incorporated in the device also may be operated so that a constant light beam for general illuminating purposes is obtained.

One of the features of the invention is that it is adaptable for routine use by workmen who can use thedevice as an electric lantern, or as a radiotelephone transmitter and receiver, with use being made of the pulsing light and synchronously-emitted tone signal whenever emergencies may require it. Obviously, since the de-- vice is portable, it may be used for communications and warning purposes between trains, between crewmen on the ground, or between a train and workmen on the ground. In the latter application, one of the devices of the invention may be secured at the front of a locomotive or other vehicle, the reflector being positioned in such manner that the radio beam is directed ahead of the locomotive, while a second device as described here is disposed on the ground in the vicinity of work crews to warn them of the approach of the train, as well as to warn the engineer of the presence of the work crewby means of signals transmitted by the stationar unit in the vicinity of the work crew.

The device normally may employ a portable transmitter and receiver, with connections being such that when the pulsing unit is to transmit a periodic warning signal, the equipment is automatically transferred from normal receive condition to the pulse transmit condition, with the equipment reverting to the normal receiving condition between pulses. A transmitter lockout relay may be employed in the receiver circuit so that if a carrier wave signal from another transmitter is received by the device, the transmitter lockout relay will automatically cause the pulsing unit to become ineffective as long as the carrier signal is being received and simultaneously will cause a visual and/ or audible calling or warning signal to become operative on the portable ,device. receiver so that an aural signal of relatively high audible intensity will be received on the portable device simultaneously with the visual calling signal. In operation, when the portable device is in use, and another transmitter, such. as that located on a locomotive or at a control station, goes on the air, the portable device will automatically cease pulsing and a visual calling light and/or an auxiliary audible calling device, such as a bell, on the portable device will become effective to draw the attention of the operator to the signal. Thereafter, the loudspeaker or the earphone of a handset incorporated in the unit will be effective in reproducing any voice communications coming in from the other transmitter. A handset is also utilized so that two- A loudspeaker is also connected to the way communications may conveniently be employed.

It is an object of this invention to proVide a radio signaling device wherein a radiotelephone is used in combination with visual signalin or warning means.

A further. object of. the inventionis to provide a portable radioteleplione communications system and combination visual signaling or warning means.

A further object of the invention is to provide a portable device which includesa-radio transmit ter and receiver, having in combination alpulsing.

visual signaling indicati g; means operative in combination with its complemental transmitten.

A further object of the invention is to provide a communications warning system wherein a pulsing radio tone and pulsing visual signal are simultaneously transmitted from one unit, and the pulsing radio. tone may be received on a second unit.

A further. object of the invention is to provide a communications warning system wherein a pulsing radio tone andv nulsingfvisual'sig'nal'are simultaneously transmittedrfromone unit, and the pulsing. radio tone may be aurally received onasecond unit, with a secondaural alarmsignal on the second'unit; which second alarm may respond to the rece vedfcarner wave energy on the second unit, or maybe a pul's'ingsignal oper ating simultaneously with the pulse received' in the loudspeaker of the second device.

A further object of theinvention is'to provide a. communications and/or warning system wherein two substantiallyv similar, units as set forth herein are employed so that. there will be mutual interaction between twoJor more devices within effective rangeof each other.

A further object of .theinventi'on is to provide a communications and warning-system by usin'g'a plurality of similar units as set forth herein, wherein said units periodically emita: radio tone signal, withthe receiver of the respective units being periodicallyplacedin' operation between'the pulsesof the radio tone, and a lockout "relay being employed in each unit'to prevent automatic als: ing of the, transmitter while a, signal 'is being re ceived from, the second 'unit,f saidlockout relay also preventing, the transmitter from beingoperative when the carrier signal energy'is being received from another cooperating unit.

Further. and other objectsmay' be,,'and .may be= come apparent fromv afperusal of the'disclosure herein. It is not intended that the specific illus+ trations be used aslimitati'onsexceptfas defined by the spirit of thesubjoined claims.

In the drawings:

Fig. 1 is an oblique view of one form of acom= bination spotlight and portable vradioteleph'one device embodiedin the present invention.

Fig. 2 is a. side view illustrating a preferred placement of the batteries and radio equipment inside the case shown in Fig, 1.

Fig. 2A is aside vi'ewoi a modified'formpofa portion of the equipment shown'in Fig. 2.

Fig. 3 is. an irregular cross section of the hand.- set reel andassociatedcontacts in relation to (the housing.

Fig. 4 is a side elevational view of" the reelde' vice incorporated in the equipment ofFig. l' and designed to take upsla'ck in aha'ndsetcord when not in use.

Fig. 5 isa rear elevationaljview of the. handset cord reel illustrated. in Fig. 4, with the spring coverrplate removed.

' of a train for rear-end warning purposes.

Fig. 6 is a block diagram of the electrical circuits of the combined spotlight and portable radiotelephone device illustrated in Fig. 1, showing automatic radio and visual signaling means with coordinated pulsing device.

Fig. 7 is an illustrative schematic circuit diagram ofv the combined visual-and radio signaling device shown in Fi 1. w I I i Fig. 8 is a side view of the device embodied in the present invention showing its use at the rear Fig. 9 is aplanview of two railway tracks with trains thereon, illustrating one form of directional radiation pattern established by the warning device ofFig. 8.

Fig. 10 is a block diagram of a radio communications system similar to that illustrated in Fig. 6 and including a lockout relay for suspending automatic warning pulse transmission during periods in which a signal is being received from other}"st atic msf' Referringto the-"drawings; andmore particu larly toFig. 1, there is shown an oblique view of one illustrative form of the equipment embodied iritheinvention iri'wliiclia metal case I2 is provided to holdf'a co'rnbi'nationradio receiver and transmitter and associated batteries, the placement dtilsof Whicll'w-illhie-described later. A hinged top cover'li' allows 'a'ccess to the interior ofthe case and handle I-6"'-is'- provided-for carryingpurposes. The louver's i1 give weather protection tea-loudspeaker n a untec the case and to be described later. Handset shield-in place by-spri-ngoIip Zl'wheri-notin'us Recessed compartments 23 and '24are p'rovided to house the receiver 'l-aB and microphone l-9'Aof the handset I9 and to hold itin 'su ch manner 'that'it will not pro ject by an excessive amountiroin the case when held in=pla'ce by thespring clip i i I An extruded metal cover-2 named to the side of the case as showng -to heusea-reel employed to automaticallytake-upthe sla'ck on t'he multiple conductor cord 28"wh'enthe' handset 1-9 is'not in use. A'protective capZS vVithafretaining chain 30 covers a telescopic type of radi'o antenna when the antenna is mean -use; A- second' prot'ective cap 3| heldby a-i'etaini-n'g 'chai'r'l 32-cover's' a multiconnection receptacle so that. equipment'may-be connected theretoto provide control' means from a remote=point. A sp'otlight "33 pi ojectsfrom the front of ease l2 --and 1containsboth' a clear light bulb and a red'lightbulb; 'tq-bedescribed1ater.'

Three toggle switches 5 '3'B-;-and 31 provide necessary switching controls'fcr" controlling op erationof 1 different s'ectiens of thef equipment. Toggle-switch 35 applies pdwe to a clear spotlight bulb, tote described Figi 2. -Toggle-swith 36 applies power-to the radio eduipment'sdthat either the receiver-or transmitter-maybe" use'di' as desired by the operator v Toggle-switch? 31 applies power to an automatic pulsing device to be later described which I causes peri'cdic" operation of the red"lig-ht bulb infspotlight' 3 3 5'and: at th'e same time causes the synchronize-macro emission of a warning tone signal" at periodic intervals, such as one or 'two' secondsffurtherf details of which willbe described later; Indents such'asZ-S on the sides of "case 12 provide"fasteningmeans in which locking bolts; not illustrated; may. be in:- sertedto hold the equipment infiasuitable shockemounte'd frame 'o'n'the -fronti or rear of a trainor other vehicle-, 'as will -'-bedescribed subsequently;

Fig. 2'shows in outline fcrm 't'he 'illustrative placement of the various comporienftslvvithin case I 2. The-spotlightii as slicwfi includes clear light bulb 38, and red light bulb 39, disposed in front of a common reflector 4I. Handset I9 is shown held in place by the spring clip 2i while loudspeaker 40 is mounted behind the protecting louvers I'I. Fig. 2 also shows a press-to-talk switch 50 in the handset I9 which operates a multiple contact relay, to be described later and which is a part of transmitter-receiver unit 5| and serves to transfer the radio circuits from the normal receive condition to the transmit position, as will be explained in subsequent paragraphs. The handset I9 is indicated as held in place by spring clip 2i with the recessed compartments 23 and 24 housing the receiver I93 and microphone I9A.

Space is provided for the battery unit 46 con-.- sisting of A, B, and C battteries. The telescopic antenna 48 is shown in its closed position, the top of the antenna being covered by the protective cap 29. The radio receiver-transmitter 5I is located in the top portion of the case.

.The multiple-conductor handset cord 28 is normally wound around the reel 53 thus taking up the slack which would otherwise protrude from the case when handset I9 is clipped in place on the equipment. This reel has associated with it suitable brushes and contact rings, to be described in connection with Figs. 3-5 inclusive, and is accessible for service and inspection by removing the metal cover 26.

Fig. 2A illustrates an optional arrangement of a portion of the unit wherein the handset I9 employs a loudspeaking type of receiver unit 20 which when placed in the position indicated, provides suflicient sound energy to take the place of the loudspeaker 40, Fig. 2. A suitable horn 20', Fig. 2A, extends downward as shown from the receiver unit 26 to the openings in the louvers I'I, thereby providing a weatherproof horn-type loudspeaker.

Fig. 3 is an irregular cross-sectional view of the reel device employed to take up the slack of the handset cord. Reel 53 is provided with a moulded center disc 63 into which are imbedded five contact rings such as 65. The terminating end of the handset cord (not shown) passes through the opening 61 of the reel, while the five conductors of the cord are soldered to contact pins such as 68 which connect through the moulded insulated center disc 63 to their respective contact rings such as 65.

A center bushing III is moulded into the insulated center piece 63 and rotates with it on fixed shaft H, said shaft being suitably secured to the extruded metal cover 26 previously described in connection with Figs. 1 and 2. A locktight screw I3 secures the reel 53 to the shaft I I washer 13A being positioned between the screw-head I3 and the end of shaft II to permit free rotation of bushing without loosening screw 13.

A removable cover 69 is attached to the side of the reel to hold in place the coiled spring I4, one

end of which is fastened to the shaft II by rivet I6, and the other end of spring 14 being fastened to cover 69 by rivet l5.

The contact assembly 88 consists of five spring contacts such as 19 secured to the insulating plate 8| by means of rivets such as 83. An insulated backplate 82 separates the contact assembly 88 so that the rivets such as 83 will not be shorted when the assembly is held in place on metal supporting partition 84 disposed within the case I2 and which separates the reel compartment from the radio and battery space in the case I2, Fig. 2.

Fig. 4 illustrates a side view of the reel 53 in combination with brush or spring contact assembly 88. This view clearly shows that center screw 13 holds the reel 53 on a center shaft 1 I, with the contact rings such as 65 being moulded into the center section 63 as is also shown in detail in Fig. 3. The brush or spring contact assembly 88 as shown is provided with five spring contacts or brushes such as 19, fastened to an insulating strip 8| by means of rivets such as 83. Projections such as 86 are provided on the spring contact I9 to facilitate their use as soldering terminals for the connecting wires between the handset cord and the radio equipment.

Fig. 5 is a view of the opposite side of the reel 53 as shown in Fig. 3 but with the cover 69 removed and illustrates the use of a coiled spring E4 to cause rewinding of the handset cord previously described. The spring 14 is normally held in position on the shaft II by the rivet I6 with a similar rivet 15 normally being used to secure the other end of the spring to an extruded metal cover 69, as is shown in Fig. 3.

Fig. 6 is a block diagram of the electrical circuits of the equipment in which the battery unit 46 connects through switch 35 to clear spotlight bulb 38. Switch 36 connects the battery unit 46 to the transmit-receive switch 96 and to the transmitter receiver unit 5I, or component radio receiver section 5IA and cooperative radio trans,- mitter section 5IB which for reason of clarity in illustrating the block diagram are represented as two separate units but which in actual practice may consist of a single unit with the transfer switch 96 being used in any well-known circuit to change the circuit functions from the normal receive operation to the "transmit operation. For clarity, an antenna 48 is indicated as connected to either the receiver section 5I A or the transmitter section 5IB. In the case of a transceiver the antenna coupling to the transmitter may be the same as the antenna coupling to the receiver, as shown in Fig. 7, effecting a single antenna connection with both the transmitter and receiver circuits and operable with either as determined by the position of the transmit-receive switch 96, Fig. 6.

The receiver section 5IA is provided with a loudspeaker 4D and an earphone I9B, the latter normally being a part of a handset I9 previously described. The transmitter section 5B is provided with a microphone I 9A, and a press -to-talk switch 50, both of which may normally be incorporated in the above-mentioned handset l9 as previously described.

Switch 31 connects the battery unit 46 to an automatic pulsing device I06 which may be of any well known construction such as a bi-metal thermostatically controlled switch or other suitable circuit interrupter of alternate make and break type operated by an electrical motor or spring driven mechanism. The automatic pulsing device I06, periodically and momentarily connects battery unit 46 to red light bulb 39 and concurrently or simultaneously energizes the transmitter 513 through transfer switch 96 and also connects the output circuit of a tone generator I09 to the signal input circuit of the transmitter 5IB, thereby affecting the periodic emission of a radio carrier modulated by the tone signal simultaneously with emission of a visual warning signal from red light 39.

Thus, in emergencies, trainmen from a derailed train or the operator of a truck or other vehicle which may have stopped in a traffic lane in such position as to form a trafiic hazard, may use the automatic warning device embodied in the pres- &4155518 ent .invention to repetitivelyand automatically convey both a visualwarning signal of a distinctive characteristic toon'comingtrafiic and a radio warning signal which may be received in approaching vehicles as a distinctive tone signal whose audible characteristics .are such that they may readily be reproduced by a loudspeaker in the vehicle.

The illustrative schematic radio circuit, Fig. '7, consists of a transciever combination in which the same tubes and many of the same circuit .components are used for both receiving and transmitting, as determined by the operation of a transfer switch 96 to changecircuit connections. This change from the normal receive to the transmit position is accomplished in the present instance by a multiple-contact transmit-receive relay 96 or other suitable transfer switch as will be described in detail in subsequent paragraphs.

The toggle switch 35 connects the positive terminal II2 of a -6-volt A battery to the spotlight bulb 38. The toggle switch 36 is a two-pole switch in which arm IIB connects the -6-volt A battery terminal I I2 to the filaments of the radio transceiver vacuum tubes and arm II'I connects the positive terminal N3 of a 90-volt B battery to the plate circuits of the vacuum tubes in the radio equipment. Terminal H4 connects the A and B to ground so that all battery circuits are completed to a common ground as indicated in the drawing.

The toggle switch 31, is of three-pole construction, through which arm I64 causes application of 6-volts from positive terminal II; to the pulsing device or interrupter I06 when switch 36 also is closed. Arm I61 of switch 3,! closes the ground-return circuit of red light 39. Arm 110 of switch 31 connects the positive terminal '3 to the radio transceiver as will be explained in more detail in subsequent paragraphs.

Movable contact I23 of relay 96 when in the transmit position connects to contact I56 thereby connecting the plate circuit of tube I2I to terminal I39 of transformer I38 which in the transmit connection serves as a modulation transformer. Terminal I4'I of transformer I38 connects to movablecontact I44 of relay96. and makes contact with contact I58 when the relay is in transmit position, connecting the positive B terminal II3 to the plate of tube I2I through winding M0 of transformer I38. Movable contact I60 of relay 96 in transmit position connects with contact I6I and applies A battery voltage to microphone .I9A through winding I63 of transformer I26. former I26 functions as an interstage audio transformer when Winding I 25, isconnected inthe receive position and serves as a microphone transformer when windin vH53 is connected with the microphone I9Ain the transmit position.

When switch 3'! is closed in conjunction with switch 36, the pulsing circuit of the equipment is placed in operation, switch contact I64 connecting the 6-volt battery circuitto the pulsing unit I86, in this instance indicated .as a bi-metallic type of intermittent contact switch. The positive terminal N2 of the 6-.volt batterycircuitconnects through the resistor wire I66, to. both the winding of relay 96 and-the red light 39. The circuit to the Winding of relay 96 is then completed to ground, whilethe ciIfQuitto the red light 39 is-completed to ground through the arm t6! of. switch 31. The purpose of switch-arm I61 bein o prevent the, red light .3.9, rom operatin It will be seen that trans;-

8 when theipress-to-tallg switch 58 on the handset 1191s p essed While makin a voice l f ell missioll- FI'he arm I10. on switch .31 whenclosed connects the. positive terminal I I3 of the 3 battery to move able contact I'H of relay .96 and when relay 96. is

closed, connects with contact H3, applies plate voltage to the tone generator tube I12.

The audio-frequency output from the tone generator I12 is coupled through capacitor I'M to terminal I15 on the audio driver transformer I3I.

-'I he operation of the automatic pulsing unit I06 is such that when both switches 36 and 3 are closed the radio equipment is automatically transferred atregular. periodic intervals from the receive position to the transmit position, with red light 39 being energized during the trans,- mit period. During the receive period, ree sistance Wire I66 drops the voltage across the relay 96 and the red light 39 so that they do not effectively operate. As the resistance wire I66 heats the bi-metallic contact arm I16, the contacts III close, shorting resistance I66 and pro.- viding full voltage to operate the relay 96 and the red light 39 for a short interval until the cooling of bi-rnetallic contact arm again opens contacts I'll, causing opening of relay 96 and dimming of light 39 below the threshold of vision. This cycle is repeated at any desired interval, which may be controlled by adjusting the spacing of contacts Ill. Other electrical or mechanical means may be provided to intermittently operate the'combined light and radio signal, such as any well-known electric or spring-driven device.

The remote control unit I85 consists of another handset unit I9 comprising earphone I9B, microphone 19A and press-to-talk switch Fill, radio control switch 36' and pulse control switch 31' connected to a multi-contact male plug I84, Which when in the receptacle I83 place all of the above-mentioned remote units in parallel with the handset I9 and switches 36 and 31 on the transmitter-receiver unit. Therefore, it will be seen that the remote, unit I85 may duplicate the performance of handset I9, switch 36 and switch 3 1 as previously described.

It may be pointed out that the circuit indicated in block diagram Fig. 6 and schematic diagram, Fig. 7, is purely representative and that separate transmitter-receiver units or other combinations of tubes and switching means may readily be employed to obtain satisfactory .rcsul s- Fig. 8 shows one manner in whichthe case I2 maybe attachedby clamps l92lon a suitable supporting frame I9I at therear of a train or other vehicle to provide a combination visual-radio warning signal, bothofpulsing characteristics, as previously described. A parabolic reflector I94 .r'nay be placed at the rear of the unit and positioned so that it isat anefiective reflector location with respect to the antenna .48, thereby producing a 'rearwardly-directed radio beam extending directionally along the light beam from case l2 where such'directional radio pattern is desired for rear-end warning purposes.

A multiple conductor cable I96 with a male plu :l84,.pr i01 y d s ribe in reference to Fi 'l, connects thecase [2 to the remote control I85, Fig. 8, said remote control consisting of; a hand .set19' a d sw tch sfififand-.315. as pr v o sl desc b d. i conn t on withi 7- When the u it s ed. in v th ma usr indicate .9. ed in Figs. 8 and 9, it can operate as a radio transceiver or a combined pulsing red signal light and radio warning device.

Fig. 9 shows a View of a two-track railroad right of way with trains 20I and 202, moving in opposite directions in which the rear car I98 of train 20I is equipped with a combined radiolight unit and parabolic radio reflector as described in Fig. 8. A portion of the approximate radiation pattern is indicated by the dotted line I99, Fig. 9. I

Figure 10 illustrates a block diagram somewhat similar to that shown in Fig. 6 but including only the radio and pulsing units to which has been incorporated a transmitter or pulse lockout feature.

In the figure, the receiver 5IA and the transmitter SIB are indicated connected to the antenna 48 through an antenna transfer relay 99 although in the case of a transceiver both the receiver 5| A and transmitter 5IB may consist of a single unit whereby the antenna transfer relay 99 is not required.

The handset I9 is provided with an earphone unit I9B which is connected to the receiver output in conjunction with the loudspeaker 40, a microphone I9A which connects to the transmitter 5| B and a press-to-talk switch 50 which controls the operation of the antenna transfer relay 99 and the plate power transfer relay I00. pulsing unit I06 is controlled by the operation of a pulse control switch IOI. When the switch "II is closed the pulsing unit I06 operates the plate power transfer relay I and the antenna transfer relay 99 simultaneously with the tone generator I09, causing the transmitter to send out a tone pulse at intervals, such as every alternate second.

On the alternate second between pulses the equipment is in the receive position.

In addition to the speaker output circuit of the receiver I A, a second output is provided for the purpose of operating a transmitter lockout relay I02 so that any incoming signal will operate the visual calling signal I05, and/or an auxiliary audible calling device such as a bell I05A also controlled by relay I 02 and placed in operation upon closure thereof, thereby providing both visual and aural calling means. A switch I05B is inserted between relay I02 and bell I05A to permit the operator to take the bell out of operation after a call has been received, The transmitter lockout relay I02 also connects to the pulsin unit I06 so that if the pulsing feature is in operation it will be made inoperative by locking it out of the circuit, thereby allowing the reception of any incoming signal.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. As an article of manufacture, a housing and,

contained therewithin, a battery, a radio transmitter and a radio receiver energized by said battery, loudspeaker means actuated by said receiver, a light source energized by said battery, a pulse generator connected between said battery and said light source and said transmitter respectively so as to pulse the respective outputs thereof, first switching means mounted upon the exterior of said housing for energizing said transmitter and said light source, an antenna fed from said transmitter, a hand set including a microphone connected to modulate said transmitter, and an earphone actuated from said receiver, and second switching means automatically actuated in timed relation to said first switchin means Thefor alternatively connecting said transmitter and said receiver to said antenna. I

2. As an article of manufacture, a housing and, contained therewithin, a battery, a radio transmitter and a radio receiver energized by said battery, loudspeaker means actuated by said receiver, a light source energized by said battery, a pulse generator connected between said battery and said light source and said transmitter respectively so as to pulse the respective outputs thereof, first switching means mounted upon the exterior of said housing for energizing said transmitter and said light source, an antenna fed from said transmitter, a hand set including a microphone connected to modulate said transmitter and an earphone actuated from said receiver, and second switching means for alternatively connecting said transmitter and said receiver to said antenna.

3. In a combination radio transceiver and light beam signaling device including a radio transmitter, a radio receiver, a light source, and a power source, pulsing means for periodically and synchronously exciting said transmitter and said light source, means for directin the output of said transmitter and said light source predominantly over substantially a single path. switching means for alternatively exciting said transmitter and said receiver, transducer means connected respectively to said transmitter and said receiver, switching means for putting into operation said pulsing means, and an audio tone generator connected between pulsing means and said transmitter, whereby the output of said transmitter is modulated at audio frequency and pulsed.

4. In a signaling system of the class described, the combination which includes, a power source, a pulse generator controlling the output thereof during transmission, a signaling light and a tone generator controlled by said pulse generator, a transmitter fed from said power source and modulated by the pulsed output of said tone generator, means for directing the respective outputs of said light and said transmitter predominantlyover substantially a single path, a receiver fed from said pbwer source and switching means for alternatively connecting said transmitter and said receiver respectively to radiate and to re ve energy along said path.

5. In a signaling system of the class described, the combination which includes, a radio transmitter, a radio receiver and a calling signal actuated by the output of said receiver, relay means for alternatively exciting said transmitter and said receiver, means for modulating said transmitter, pulsing means for simultaneously causing intermittent excitation of said modulating means and said relay means, and a transmitter lockout relay actuated by the output of said receiver upon reception of a calling signal and connected to said pulsing means so as to suspend the operation of said pulsing means upon the reception of a signal.

6. In an automatic break-in signaling system, the combination which includes, a transmitter, a receiver, an antenna, relay switching means for alternatively connecting said transmitter and said receiver to said antenna, a pulse generator intermittently energizing said transmitter and simultaneously actuating said switching means so as to connect said transmitter to said antenna, and a transmitter lockout relay actuated by the output of said receiver and connected to said pulse generator so as to de-energize said generator upon the reception of a signal during an interval between transmitted pulses.-

7. In an automaticbreak-in signaling system, the combinationzwhich includes, atransmitter, a receiver, an antenna, first relay switching means for alternatively connecting said transmitter and said receiver to said antenna, a power Source, second relay switching means for alternatively connecting said power source to said transmitter and said receiver synchronously with the re spective connection of said antenna to said transmitter and saidreceive-r,a pulse generator intermittentlymodulating said transmitter and simultaneously actuating both said switching means so as to connect said transmitter to said antenna, and simultaneously to connect said transmitter to said power source, and a transmitter lockout relay actuated by the output of said receiver and connected to said pulse generator so as to deenergize said generator upon the'reception of a signal during an interval between transmitted pulses. 8-. In a signaling system of the class described, the combinationwhich includes, an antenna, a radio transmitter, a'radio receiver having at least one plate circuit, anantenna transfer relay and a'plate power transfer relay, a pulse generator simultaneously actuatingboth said relays and modulating said transmitter, and a transmitter lockout relay actuated bysaid receiver and connected to and controlling the operation of said pulse generator, whereby the connection of said receiver to said antenna and the excitation of the plate circuit of said'receiver is made during an interval between transmitted pulses, and whereby the reception of a signal during said interval actuates said transmitter lockout relay and causes said pulse generator to cease operation during said reception. v

9. As anarticle of manufacture, a housing, and secured thereto, the following:. a battery, a radio transmitter anda rad-i receiver energized by said battery, a loudspeaker actuated by said receiver, a light source energizedv by said battery, a pulse generator connected between said-battery and said light sourceandv said transmitter respectively so as to pulse the respective outputs of said light source and'said transmitter, first switching means controlling; the operation of said transmitter and said light source, an antenna fed-from 1 2 said transmitter, a. handset including a microphone connected to. modulate said transmitter and an earphone actuated from saidreceivensecand switching means -tor alternatively connecting said transmitter and said receiver to said antenna, an extensible flexible multi-conductor cord connecting said handset to the elements within said housing, and means for automatically taking up the slack of saidcord. v 10. Asanarticleot manufacture, a housing, and secured thereto the following: a batteryya radio transmitter and a radio-receiver energized by said battery, a loudspeaker actuated by said receiver, a lightsourceenergized by said battery; 2121311136 generatorconnectedbetween said battery and said light source and said transmitter respee= tively-so as to pulse the respectiveoutputs-thereof, switching means-controlling the operation of said transmitteran-d said light source, an antenna fed from said transmitter, ahandset including a microphone connected to modulate said transmitter, and an earphone actuatedfrom said receiver, switching means for alternatively 6011-, necting said transmitter andsaid receiver to said antenna, a second light source, and a Switch connecting said-second light source directlyto said battery. P I WILLIAM S. HALSTEAD:

, REFERENCES- CITED- The following referenlces are 'of record in the f le of this patent: I

UNITED STATES PATENTS

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