Jan. 7, 1947. T. R. WHITE 2,414,079 RAILROAD TRACK SWITCH POSITION INDICATOR SYS TEM AND’ CAR ACTUATED > - CIRCUIT CONTROLLER THEREFOR Filed Aug. 18, ‘1944 2 Sheets-Sheet 1 INVENTOR. - THEM/ff ?. Wf/l/"f ' Jan. 7, 1947.‘ T_ R wH|TE 2,414,079 RAILROAD TRACK SWITCH POSITION INDICATOR SYSTEM AND CAR ACTUATED ' CIRCUIT CONTROLLER THEREFOR Filed Aug. 18, 1944 ' 2 Sheets-Sheet 2 77/f000/FE R. W/f/TE BY ATTURNEY 2,414,079 Patented Jan. 7, 1947 UNITED STATES PATENT OFFICE 2,414,079 RAILROAD TRACK SWITCH POSITION INDI CATOR SYSTEM AND CAR ACTUATED CIR CUIT CONTROLLER THEREFOR Theodore R. White, Brooklyn, N. Y. Application August 18, 1944, Serial No. 549,991 3 Claims. (Cl. 246-219) 2 The present invention relates to signal sys tems for use on railroad lines to warn the en gineers or motormen of oncoming trains of dan gerous conditions on the tracks ahead of them. More particularly it relates to a signal system in connection with a switch operating to open a siding from the main track wherey the engineer of the oncoming train is warned su?iciently in advance by a system of signal lights that the_ switch is open. It is frequently the case that when a switch is thrown so as to open a siding from the main up into such a position that it will contact the wheels of any car passing over the rail. Simul taneously, signal lights also included in the cir cuit show at a plurality of positions between the magnetic coils and the siding. So long as no train is in the block between the magnetic coils and the siding, the lights burn continuously. But when a train of cars passes over the magnetic coils, the switch having been thrown and the coils energized, the wheels of the cars strike the raised arm, driving it and its coil forward to a distance su?icient to break the circuit. However, line, even though a warning signal is displayed, as each wheel passes the arm, the latter immedi it is either so indistinct or so close to the open ately is raised to meet the next wheel by the pull switch that the engineer of the oncoming train 15 of the energized coils. There is, thus, a con tinual, rapid making and breaking of the circuit is unable to observe it in time to stop his train and a resulting rapid flashing on and off of the before running into the open siding. In this signal lights ahead of the engine, giving warn manner accidents are caused with great fre ing to the engineer to bring his train to a stop. quency and with considerable loss of life and The invention will be more clearly understood property. from the drawings in which Fig. 1 represents di It is an object of the present invention to agrammatically a section of track including a provide a system which will show warning sig main line and a siding with appropriate switch nals at various distances in advance of the open ing means and the signal circuit of the inven switch, and if the engineer runs past the ?rst of the warning lights, the next succeeding light at 25 tion; Fig. 2 illustrates diagrammatically a switch box in connection with the rod of the rail switch a considerable distance from the open switch will at the siding shown at 4 in Fig. 1; Fig. 3 shows a be caused to ?ash on and off rapidly by contact side elevation of the magnetic coil system indi arms disposed at the side of the rail. A light cated at 1 in Fig. 1; Fig. 4 is an end View in ele showing a constant lbeam may often be unob vation of the magnetic coil system of Fig. 3 taken served by the engineer, whereas a light rapidly on the line 4-—4; and Fig. 5 is a circuit diagram ?ashing on and off will more surely attract his of the signal system of the invention. attention and warn him to throttle down and Referring to Fig. 1, a main line of tracks l is stop his train. represented in which a switch 2 opens or closes Brie?y described, the invention includes an a siding 3 o? the main line I. The switch 2 also electric switch box comprising a ?xed and a operates a main signal circuit which extends from movable contact device in alignment with each one side of the source of current through the other. Assuming the rail switch to be an ordi nary hand switch, the contact devices may con sist of two contact points, one fixed on the rod of switch box 4, conductor 5, continuously burning red signal light 6, magnetic coils of switch means the rail switch and moving therewith, and the 40 ‘I and conductor 8 which leads back to the source of electric current. Another and secondary cir other being mounted ?xedly on the inside of the cuit extends from conductor 5 through signal electric switch box. Thus, when the rail switch lights l2 and I3 in parallel, conductor l0, con is thrown so as to give free passage on the main tact points of switch means 1 and conductor 8 line, the two contact points are separated and back to the source of electric current. no current passes through the circuit. When, As will be seen from Fig. 2, the switch box 4 however, the rail switch is thrown so as to open encloses a spring contact arm M on which is the siding, the switch rod carries the movable mounted a contact point 15. The contact arm contact point into contact with the ?xed con I4 is ?xedly mounted on the switch rod It and tact point and closes the circuit. Included in the moves with it when the switch is thrown. An circuit, at a predetermined position in advance other contact point I‘! is mounted on the inside of the switch, magnetic coils are set beside the of the housing of the switch box 4. Thus, when rail. On throwing the switch to open the siding the switch is thrown so as to open the siding 3, and thus closing the electric circuit, the magnetic the contact point I5 is brought into contact with coils at the advanced position become energized the contact point I‘! and the circuit is closed. and an arm attached to one of the coils is thrown 3 2,414,079 The switch means ‘I is diagrammatically shown in Figs. 3 and 4. It comprises the magnetic coils i 8 and I9 which are oppositely wound. Coil I8 is ?xed to the housing 20 of the system, while coil 19 is slidably connected with the link 2| pivoted at 24 on rocker arm 28 and the helical spring 22. The breaker arm 9 turns on the shaft 23 which also carries rocker arm 28, the breaker arm 9 and rocker arm '29 turning with the shaft 23. It will, therefore, be evident that when the main track I is open and the siding 3 isclosed, the coils l8 and [9 are de-energized and the helical spring 22 pulls coil l9 apart from coil l8, thus breaking the secondary circuit. ‘By this same pull of spring 22 the breaker arm 9 is low ered below the level of the rail 25.. When, how ever, the switch 2 is thrown so as to open the sid-_ 4 tioned signal lights to burn intermittently when a train enters a section of track controlled by said circuits; said means comprising a pair of cooperating contact points in said secondary cir cuit, a breaker arm, means normally maintain ing said contact points open and said breaker arm out of the path of wheels of said train, and magnetic ‘coils adapted and arranged to close said contact points and ‘move said breaker arm into the path of wheels of said train when said main circuit is closed whereby said breaker arm will open said secondary circuit when contacted by a, wheel of said train. 2. ‘In an electric railroad signalling'system, the combination with a rail switch of a main electric circuit that includes an electric switch that is opened by closing said rail switch and closed by ing 3 and to close the electric circuit through the opening said rail switch, and a signal light that contact points 15 and I7 in the switch box 4, the burns continuously when said main circuit is coils l8 and i9 are energized. Coil I9 is pulled 20 closed, and magnetic coils of switch means; a into contact with coil 18 and breaker arm 9 is secondary circuit including a plurality of signal raised so as to be contacted ‘by the wheels ‘of any lights spaced‘at intervals along a section of track engine or car passing over s-rail 25. Simultane controlled ‘by said circuits, and means to cause ously, a pair of contact points, one of which 26 said lights to burn intermittently when a train is ?xed and the other 27 is carried by the rocker 25 enters said track section; said means comprising arm 28, are brought into contact with each other a pair .of cooperating contact points in said sec by the raising of the rocker arm 28.and the in ondary circuit, associated with said magnetic termittent signal lights I2 and ‘.13 are thus lighted coils said main. circuit, .a breaker arm nor and continue to burn so ‘long as points 26 and 21 mally maintained a position out of the path remain in contact. 30 of wheels of said train but adapted and ar Where, however, a train passes over rail 25, ranged ito mcve into the path of wheels of said each wheel in passing strikes breaker arm 9 and train :and to close said secondary circuit when forces it downward, turning shaft 23 which car said magnetic coils are energized by the closing ries with it rocker arm 28, thus forcing coils l8 of said main circuit vwhereby said breaker arm and t9 apart and moving contact points 26 and 35 will open said secondary circuit under impact 27 out of contact. The secondary circuit being of a train wheel and ‘be drawn into closed posi thus broken, the lights I2 and [3 go out. They tion again when said train wheel has passed. immediately relight, however, when the car wheel 3. In association with the tracks of a railroad, has passed and remain alight until the next wheel an electric railroad signalling system comprising strikes breaker arm 9. The effect is to cause 40 a main electric circuit including signal lights lights l2 and 13 to blink as long as the train adapted and. arranged .to .burn continuously, and continues to pass over ‘breaker arm 9 into the a secondary electric circuit including signal lights danger zone. adapted and arranged to burn intermittently; As will be seen from the circuit diagram Fig. 5, magnetic coils insaid main circuit and cooperat the intermittent lights l'2'and l3 are connected in ing contact points in said secondary circuit as multiple series in the subordinate or secondary sociated with said magnetic coils;~ a breaker arm circuit that is closed by the raising of the breaker adapted andarranged normally to maintain said arm 9 and rocker ‘arm 28 which brings the con tact points 25 and 21 ‘into contact when the coils i8 and it are energized. - Having thus described my invention, what I claim is: 1. 'In an electric signalling system, vthe ‘con bination with ‘a rail switch of a main electric circuit including signal ‘lights adapted and ar~ ranged to burn continuously when said circuit is closed and -a secondary circuit including sig nal lights and means to cause said last men" contact points open and to assume a position out of the ‘path of wheels of a train passing on saidrrailroad track :and to move into the path of Itrain wheels and close said contacts when said magnetic coils are energized by the closing of the main circuit, whereby said breaker arm will open- said secondary circuit and cause said lights in that circuit to burn intermittently when said arm ‘is impacted by said train wheel. THEODORE R. WHITE.