US1435257A - System of control - Google Patents

Description

L. G. RILEY.

SYSTEM or CONTROL. APPLICATION FILED JAN. 6, 1921,

Patented Nov. 14, 1922..

INVENTOR Aym fiky WITNESISES: MKJM ATTORNEY Patented Nov. 14, 1922.

UNITED STATES 1,435,251 PATENT OFFICE.

LYNN Gr. RILEY, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA SYSTEM or CONTROL.

Application filed January 6, 1921. Serial No. 435.304.

To all to 71 am it may concern Be it known that I, LYNN G. RILEY, a citizen of the United States, and a resident of" Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Systems of Control, of which the following is a spermfication.

My invention relates to motor-control systems and it has particular relation to such systems as are employed in connection with railway cars.

The object of my invention is to provide a simple and efficient means for penalizing the operator in case the master controller is actuated too. rapidly, which may result in excessive current in the motor circuit, as well as discomfort to the passengers.

Various mechanical retarding devices tor controllers are in use but these are not wholly satisfactory. Electrical devices dependent upon values of current or voltage in the motor circuit are, in general, unsatisfactory, since they do not function properly under varying load conditions. In the present system, it is proposed to use asimple master controller, having a drum development of novel form, in conjunction with any standard railway control equipment.

The single figure of the accompanying drawing, illustrates, diagrammatically, a system embodying my invention.

A motor, having an armature 1 which is connected through a contactor 2 to a positive line conductor 3, has a series field magnet winding 4.- A resistor 5, which is in circuit with the armature, is connected to a negative line conductor 6.

A master controller 7 isprovided with a plurality of contact members of which members 8, 9 and 10 engage mutually in the first operative position a of the master controller. Contact members 14, 15 and 16 engage in positions a, c and e of the master controller and, in positions I) and d, contact members 141 15 and 21 are in engagement and member 16 is disengaged. Contact member 21 is disengaged in positions a, c and e.

A relay 19, in conjunction with the master controller 7 controls the line contactor 2. Contactors 24 and 25 control the accelerating resistor 5 in the usual manner.

A master controller 7 when actuated to its first operative position (1, establishes a circuit for line contactor 2, extending from positive line conductor 3, through master switch contact member 8, contact segment 9, contact member 10, conductor 11, and coil 12, to the negative line conductor 6.

A main circuit for the motor is established from the positive line conductor 3, through line contactor 2, series field-magnet winding- 4, motor armature 1 and accelerating resistor 5, tothe negative line conductor 6.

When the contactor 2 closes, a holding circuit, which is established for its actuating coil 12, extendsfrom the positive line conductor 3, through conductor 13, contact member 14, contact segment 15, contact member 16, conductor 17, interlock member 18 and coil 12, to the negative line conductor 6.

In actuating the master controller to its second operative position 0, it passes through an intermediate position which may be represented by 7).

When the master controller leaves position a and moves toward position 0, contact finger 21 engages contact segment 15, and acircuit is established for relay coil 22 extending from the positive line conductor 3, through conductor 13, contact member 14, contact segment 15, contact member 21 and coil 22, to the negative line conductor 6. Relay 19 is, therefore, actuated to establish a circuit for actuating coil 12 of contactor 2, extending from the positive line conductor 3, through conductor 23, relay 19, conductor 17, interlock 18 and coil 12, to the negative line conductor 6.

In establishing position b, the contact segment 15 is disengaged from contact member 16, thereby opening the holding circuit of coil '12. The initial circuit of coil 12 is also broken when contact segment 9 is disengaged from contact members 8 and 10.

When the controller approaches position 0, contact finger 16 again engages contact segment 15 to again complete the initial holding circuit for actuating coil 12. Slight ly further in the movement of the controller, the contact finger 21 engages an insulating member 26 to open the circuit of relay coil 22. If the controller has been actuated at normal speed, the contactor 2 remains closed.

If the operator act-uates the master controller from position a to position 0 with suflicient rapidity, contact member 21 engages the insulation member 26 to open the circuit of coil 22 before the relay 19 has closed. Therefore, line contactor 2 will open and, in order to reestablish the motor circuit, it will be necessary for the operator to return the master cont-roller to position a to re-establish the engagement of contact segment 9 with contact members 8 and 10 and a circuit through coil 12, as previously traced.

ln order not to be so penalized, the operator will. naturally actuate the master controller from point to point at a rate not to exceed that predetermined by the time elements i nhereni in the coeoper up; elements. It will he noted that relay 19' inoperative in positions 1/, c and c, which positions representoporatircpoints of the i'naster controllcr. The drun'i segment 11 def ned. with sullicient insulation distance between points a and 0 to insure the interruption oi? acircuit comprising coil '12 and conta tmeniberlG.

ll hen "the master controller is actuated. from position c to position a, thesequence of: control issimilar to that. rlr-wccribed in passing; from a to c.

The accelerating resistor .5 is sluinti-ul. by contactors 24 and in any well-knowninannor, contactor 9 being operative in position 0 and contactor in position c of? the It is evident from the foregoing disclosure that the system employed is extremely simple and that it-avoids the necessity for the use 0:1. easily, deranged devices. It is desirable, particularly in railway control systems, thata fairly: constant rate of acceleration be employed. lt-is .yery objectionable to vaccelerate muchmore rapidly with light loads than with heavy. ones and, in my invention, the maximum rate of acceleration is determ-ined, while there is no fixed minimum rate.

I claim as :my invention:

l. The combination with atmotor and a controller, or means independent of said motor circuit tor interrupting Lsaid' circuit when t 1e actuation. ol said controller exceeds a predetermined rate.

Thecombinatiou with aanotor and a controller, oft means comprising arelay ior interrupting said motor circuit independently 01 said motor circuit when the actuationoli said-controller exceeds a predetermined rate.

3. The combination with amotor and a line switch, of a controller ,andnieans controlled by said controller, when, actuated at a predetermined rate, toiwcontrolling said line switch independently ot said motor circuit.

4:. The combination with a motor and a line switch, or a controller, and means comprising a relay controlled by said controller, when actuated at a predetermined rate, for controlling said line switch independently of. said motor circuit.

The combination with a motor and a controller, oi means independent of said motor circuit for main aining said circuit while the controller is actuated at less than a tllEQlQtQlDllYlQtl rate.

The combination with u motor and a oller, oil? 'itch, controller contact n'zeinbers to: controlling a circuit for the coil of he line "itch, an interlock actuated by said lino switch lfor maintaining said coil circuit independently of said contact members, means comprising said cont-act memberstor:interruptin' the circuit of said coil, and a relay actuated independently of said. motor circuit i or. preventing,- the interruption o'l said coil. *irouit.

"T. The combina 'th :a motor and a controller, ot t tactimemb rs for con ollinga circuit for the coil 0' heline switch, an inte lock actuated byeaid line switch torn: itaining said coil circuit inde giendexitly of said cont ct members, means for interrupting the circuit of said coil comprising said contact inelnlsicrs, and a relay actuated independently of said motor circuitior preventing'the interrupt-i011 of said coil circuit whilethe cont-roller is actuated at less than apredetermined rate.

The combination with a motor and a controller hay ,g' a pluralityot operative positions, of a line contactor, an interlock actuated by: the line, con actor, a relay actuated by said controller ,orcoacting .ith said interlock to maintain a circuit through the coil of said contactor, contact members operatiyeiin one position oi? said controller to actuate said center-tor indopenden" "l? saitlrelay and said in erlock, arulf 1. members, operatiroiu oi positi 1' ml controller, ion coacting'with said relay and saidinterlocl:to control saidline contactor in accordance with the rate at which said controller iscactuated. t

In testimony whereof, I have hereunto subscribed my name, this 22nd day of Decent ber-1920.

LYNN e. RILEY.

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