Патент USA US2131818код для вставки
ct. 4, 1938. s, CQ‘RQTH 2,131,818 AUTOMATIC TRAFFIC’ CONTROL SYSTEM ' Filed Feb. 19, 1936 I 2 Sheets-Sheet 1 - Z2 21 %@ J6 / ‘5'2 //I, J7 .19 l' . J’Z 67% BY myammlé ATTORNEY-S Oct. 4, 1938. ' s. c. ROTH 2,131,818 AUTOMATIC TRAFFIC CONTROL SYSTEM Filed Feb. 19, 19:56‘ 2 Spe‘ets-Sheet 2 ' 1 ATTORNEYS Patented Dot. 4-, 1938 ATENT 4 UNITED ‘STATES FFQ 2,131,818 AUTOMATIC TRAFFIC CONTROL SYSTEM ‘Samuel C. Roth, Allentown, Pa., assignor to Au tomatic Signal Corporation, East Norwalk, Conn” a corporation of Delaware ‘ ‘ Application February 19, 1936, Serial No. 64,771‘ " ‘ 1 Claim. 1 (01. 177-337) This invention relates to electrically operated traffic sgnal lights and has for an object to pro ' vide an automatic signal- device of the stop and go, or stop, caution, and go type ‘capable of adjusting 55 itself to varying vconditions of tra?ic at all timesa A further object is to provide a device of this character adapted" to be installed at intersections where traf?c is unequally divided and provide positive safety to vehicles desiring to cross the 10' 1 main highway. - v A further object is top-rovide a device of, this character which willv so control traffic that the traffic on the main highway will have uninter rupted right of way as long as no vehicles appear ' certain camsfon the program control rotor close associated switch contacts. 1 V Figure 5 is a ‘diagrammatic view showing how another cam on the program control rotor closes associated switch contacts. ' 5 Figure 6 is a diagrammatic view showing sug gested arrangement of the ‘signal apparatus" at an intersection of a main highway and a cross road. Referring now to the drawings in which like 10 characters of reference designate similar parts A further object is to provide magnetically op erated switches, responsive to cams, or contacts in the various views, 8 designates a trai?c signal of the type adapted to indicate a go or green signal ‘9 on the main highway simultaneously with a stop or red signal It) on the intersecting‘ cross 115 road and vice versa. Vehicle operated switches H are disposed. on the cross ‘road in the path of on the program control rotor, and a switch op vehicles approaching the intersection'from either 1, ' on the cross road to» contestright of way. erated by Vehicles on the cross road, to‘operate a" the trai?c signal ‘on the main highway as an ordinary stop and go signal light as long as there are vehicles on the cross road to cross the inter section, and to maintain the tra?ic signal con tinuous as a go signal for traf?c on the main 25 highway when no vehicles are on the cross road, thus preventing the unnecessary interruption of the main highway traffic by a stop signal when no traf?c appears on the cross intersection. ‘ With the above and other objects in View the 30 invention consists of certain novel details of con struction and combinations of parts hereinafter fully described and claimed, it being understood direction and, these switches are shown as the type adapted to be closed by contact with a vehicle 20 passing thereover although any preferred type of vehicle operated switch may be employed. Assembled with the tra?ic signal 8 are a pair of opposed electro-magnets l2 and Hi and be tween the poles of the magnets there is mounted 25 an armature M which is magnetically attracted by one or the other of the magnets to open and close a switch l5 which controls the motor- circuit of the tra?ic signal. The switch l5 may be a single throw switch of the snap type adapted to be 30 . yieldably held at either limit of its movement, at one limit of its movement engaging a switch that various-modi?cations may be resorted to contact [6 in the motor circuit, shown best in within thel'scope of the appended claim without Figure 35 departing from the spirit or sacri?cing any of the advantages of the invention. In the accompanying drawings forming part of this speci?cation, - , Figure 1 is a diagrammatic view of tra?ic signal 40 apparatus constructed in accordance with the in vention and showing ‘the motor circuit open to 2. , l ' When the vehicle operated switch H is closed 35 by a vehicle passing thereov-er when approaching the intersection, a circuit H is closed through the magnet 53 which is thus energized to attract the armature l4 and close the switch It in the circuit position thus to operate the device as a continuous E8 of the traffic signal motor IS. The‘motor ro- .40 tates the program rotor 20 through a worm 2i and ‘worm gear 22 to set in motion the program con trol cams 23. The program control cams operate in the usual manner to close switch contacts 24 in the signal 45 light circuits in sequence to ?rst change the signal to caution or amber for the main highway. Then stop and g0 signal of the conventional type. Figure 3 is a view similar to Figure 2 but'show 50 ing the upper switch of the pair of magnetically go or green for the cross road and simultaneously to stop or red for the main highway. After an- 50 maintain the green or go light continuously on' the main highway. . Figure 2 is a view similar to Figure 1 but show 45 ing the motor circuit closed to turn the rotor and the upper magnetically operated switch in open operated switches in closed position to ' permit stopping of the program control rotor by cam 25 when one revolution of the rotor has been com pleted. 50 Figure 4 is a diagrammatic view showing how after an'interval the signal will be changedto other interval the signal will change to caution for the crossvroad and thereafter to stop- or red for the-cross road and simultaneously to go or green for the mainrhighway. The latter or go signal for the main highway 55 2 2,131,818 will remain continuous as long as no other ve hicles appear on the cross road at the intersection and this is accomplished'by stopping the rotor at the end of one revolution by means of a cam 25 on the program control rotor. The cam is dis the intersection under the protection of the green or go, light of the cross road. When the cam 35 subsequently closes the con tacts 34 the magnet 29 will be energized to close the switch 3| which controls the circuit 21 so that 5 in the event of no more tra?ic appearing on the posed to affect contact 26 preferably at the end of the predetermined go period for the main high cross road, when the cam 25 next moves around way and closes switch contacts 26 in a circuit 21 into circuit closing position to close the circuit which energizes the electro-magnet I2. When 10 the magnet is energized it attracts the armature I4 to open the switch I5 which breaks the motor circuit, as shown in Figure 1. Thus the rotor will stop at a point which will give a cross lane ve hicle a favorable light without delay. It is essential that means be provided whereby a late arriving vehicle on the cross road will not be trapped at the intersection if the signal is about to change against it.‘ For this purpose a pair of opposed electro-magnets 28 and 29 are assembled with the traf?c- signal and between the poles of the magnets there is mounted an armature 30 which is magnetically attracted by one or the other of the magnets to open or close a switch 3! in the circuit 27. The magnet 28 25 is connected in series with the vehicle operated switch II and in parallel with the motor circuit closing magnet I3, as shown at 32. The magnet 29 is connected in circuit 33 with a pair of switch contacts 34 which latter are in the path of a cam 30 35 on the program control rotor 29. The cam 35 is disposed to affect contact 34 at or near the end of the go period for the cross road, or at the beginning of the caution period that follows, so that a late arriving vehicle will command the right of way regardless of its time of arrival, The magnet 28 should be more powerful than the magnet 29 in order to assure opening of the cir cuit 21 in the event that both magnets 28 and 29 are energized simultaneously. When a late arriving vehicle that is, one arriv ing just as a change of signal is about to take place, passes over the vehicle operated switch II it will be seen that the circuit through the magnet 28 will be closed and the magnet thus energized 45 attracts the armature 30 to open the switch 3| in the circuit 2‘! which controls the motor stop 40 ping electro-magnet I2. Consequently, when the advancing cam 25 closes the circuit 21 at the contacts 26 and magnet I2 cannot be energized 50 to open the switch I 5 and stop the motor since its circuit 27 is open at the switch 3|, as shown in Figure 2. Thus the program control rotor must continue to another revolution during which time the late arriving vehicle may proceed safely across 21 at the contacts 26 the magnet I2 will be ener gized to open the switch I5 and break the motor circuit to stop the motor. From the above it will be apparent that a ve hicle on a cross road approaching a main high way intersection will always command a go signal and yet grant the trai?c on the main highway a 15 su?icient go interval to avoid unnecessary delay for trai?c on the main'highway. From the above description it is thought that the construction and. operation of the invention will be fully understood without further explana 20 tion. What is claimed is: In a tra?ic control system of the class described, a program control rotor, an electric motor for driving the rotor. a motor circuit which when 25 closed energizesthe motor and when opened re energizes the motor, a switch in the motor cir cuit, opposed electro-magnets one of which closes the switch and the other of which opens the switch, a vehicle operated switch connected in 30 circuit with the switch closing electro-magnet, switch means operated by the rotor and control ling the electro-magnet which opens the motor circuit switch to normally con?ne the rotor to a single revolution; and means for permitting the 35 rotor to continue through more than one revolu tion when the vehicle operated switch is actuated just as a change of signal is about to take place comprising a circuit, a switch in said circuit, op posed electro-magnets one of which closes the 40 switch and the other of which opens the switch, the electro-magnet which opens the switch being connected in series with the vehicle operated switch and being connected in parallel with the electro-magnet which closes the motor circuit 45 switch, switch contacts in said circuit, the other of the electromagnets being connected in series with the switch contacts, and a cam on the rotor for closing the switch contacts, coasting of the motor permitting the rotor to move su?iciently 50 to disengage said cam from said switch contacts to deenergize said electromagnet which opens said switch. SAMUEL C. ROTH. , , CERTIFICATE 0F CORREGTION._ Patent No. 2,151,818. ' October h, 1958 . SAMUEL c. ROTH, It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, first column, line 2, for "sgnal" read signal; page 2, first column, line LL9, for "and magnet" read the magnet; same page, second. column, line 26-27, for "re-energizes" read de-energizes; and that the said Letters Patent should- be read with this correction therein that the same may conform to ‘the record of the case in the Patent Office. Signed- and sealed this‘ Zhth day of January, A, D.‘ 1959.. Henry Van Arsdale (Seal) 7 ‘ Acting‘ Commissioner'of Patents.