US1795790A - Car-door control - Google Patents

Description

March 10, 1931.

E MURPHY CAR DOOR CONTROL Filed Dec. 27, 1928 INVENTOR I ERNEST MURPHY BY @L ATTORN E {47 4'20 trols a door-operating engine.

nets and their. mode of action on the, door Patented Mar. 10, 1931 'UNITED STATES PATENT- o Fics ERNEST MURPHY, OI ALBANY, NEW,YORK, ASSIGNOR T0. CONSOLIDATED CAR-HEATING COMPANY, INQ, F ALBANY, NEW YORK, A CORPORATION OF NEW YORK CAR-noon oon'rnor.

Application-tiled December 27,1928. Serial No, 328,820.

,For a detailed description of the present form of my. invention, reference may be had to the following specification and to the-accompanying drawings forming a part thereof: I I r In the controlling of car doors it has heretofore been suggested that the motor which operates a car-door, to close or open-it, should be dominated by a counter electromotive 5' force magnet, whereby the opening andclosing of the door by the motorman could only occur when the car -was standing still and the said magnet therefore deenergized. In such arrangements, however, it still remained necessary for the motorman to perform some act that would cause the door to open after thecar. came to a standstill or close before the car restarted. In brief, the said suggested arrangement did not eliminate the need of action by the motorman to open or close the door, but only permitted suchaction to take effect on the door when the car was stopped. In my present invention my purpose is to make the stopping or starting of the car automatically open or close the door without need" of any door-opening or doorclosing action by the motorman.

In the, accompanying drawing, A and B represent two magnets each ofwhich con Such magdoor. An example of such an arrangement of magnets and door opemmon 1S found :10 goes to the contact plates of the usual controller, so that the said controller as it iisfi in the United States; patent to Thomas Farmer, Jr., No. 1,216,300, which is**se'-- 4o lected solely for the purpose of illustration and without limiting the invention.

,automatically withoutaction' by the motor-v 't'em' has been diagrammatically shown inthe drawing. Referring thereto K indicates the feet of operating the controller is to close the Thus before the controller starts to regulate nectingl and 2 and directing the energizing current of line 7 from 2 to the magnet A, or

will bear thereon along the dotted line 6,

thereby connecting 2 and 3 and directing the said current from 2tomagnet B, or, thirdly,

will bear thereon along dotted line-e, thereby connecting 1, 2 and 3 and directing the current from 2 to both'magnets A and B. Since the doors, in my plan,-are to open and close man, this selector swltch becomes necessary and may be set by the motorman as described, or, mother ways, so as to director limit the' automatic action to the desired door '-or group of doors.

The invention may be placed in anystandard motor controlling the circuit. For purposes of illustration and without intention of limiting the invention thereto such a sysusual circuit closer of astandardtype motor.

control, which is a part of practically all commercial equipment and is operated to admit current'to the motor through thewire T leading from the usual trolley. It is also .to be understood that the back stop G isalso connected to the same control. The first efswitc'h K, thereby admitting current to the m otor,and opening theswitch P, thereby breaking theshort circuit around the resistanceQ, which is in series with the magnet E.

the speed of the car, the magnet E has the so resistance. Q, in series with it. The conductor inclosure of the resistance, and then cuts out the resistance to. regulate the motors after they are in multiple. The, conductor'll leads on Lil from the controller to the motor, as is obvious from the drawing. 7

In operation the motorman, when he starts, first closes switch K and opens the switch P, as aforesaid. The closing of the switch K starts the motor and then by a further movement of the controller the speed of the car is regulated.

While the car is running the counterelectromotive magnet E is energized and thereby opens the circuit from the control through the lineGr leading to the door control at D.

At this time the doors cannot be manipulated.

as long as the motors are receiving current,

It is only after the motor controller has out off the motor from the trolley that the mag-' net E receives current from the motorswhile they are st1ll running by lnertia.

tive force magnet, because the electromotive force of the motors running under their own 'inertia supplies it withcurrent and this current: does not cease tov flowuntil the motor has come to a stop. l/Vhen the. motor actually has stopped, the. magnet E is de energized and its armature is accordingly released, thereby establishing the control connection with the door operating circuit 6. Thesa1d c1rcu1t-6 1s now energized and the doors will open automatically without any other action by the motorman. Prior-to the present; invention, when the car was stopped the motorman hadto dosomething to causethedoors. to open, but by the present invention the stopping of the carautomatically causes the door to open without the intervention of the motorman. The switch marked; 3' is an emergency feature for use when the, trainv stops, in. a tunnel or some place where the, doors should still remain closed; Forinstance, in the subways now existing in many of the large cities a, train mayjbeheldup by signals between stations. Ordinarily as the train, comes to a stop under the present invention the doors would automatically open. This, however, is undesirable under the circumstances and the switch R-is operatedto render the, door controlling circuit ineffective. In other words, itis undesirable under normal conditions to open the doors when the train stops except theregular stationst ops. Solong as the switch R remains. closed after the stopping of the car or, train it will automatically open o the doors.

In-Ithe drawings the switchmarked D is shown with an irregular contour so as to provide a selective control over the number of doors which will be operated automatically when the train comes to a stop. For instance, the doors on the side of'the caror train neXtto the station platform are the only ones which are normally opened, those on-the other side of the car or train remaining closed: Thewidest portioniof thesw-itch thereby caused to close. place without any action by the motorman,

D is designed to control all the doors on both sides and the other portions are each so designed to control the doors only on one side or the other.

E is a counter E. M. F. magnet connected by the wires 4 and 5 to the respective armature terminals of the propelling motor F, or by wires 4 and 8 when the controller in its usual operation breaks wire 5 and connects wire 8 to the trolley. Then the motor stops there is no current in E and its armature drops back against a trolley-connected backstop G. The current then goes from said back-stop by wireso and 7. to theselector and thence to thevalvemagnet A and towhatever others may be also connected to the selector. These valve magnets being energized will Therefore, the magnet E is calleda counte gelectromo the magnet E is energized once more and acts to shut offthe current fromtheline 6, 7'leading to the valve 'magnetsand the; doors are All of thistakes except to start and stop the car or train.

To insure the sett ng of selector switch D,

it may be interlocked with the usual removable controller handle in any suitable way, whereby the said controller handlecan only be removed or replaced when the selector switchjis properly set.

lVhatlZ claim as new-and; desire to secure by Letters Patent is: i "1. In car-door operation, a door-engine controller andmeans for automatically work ing said controller to close and open'a door by' means'of a counter electromotive force magnet bridging the armature terminals of the car propelling motor.

2. In car-door operation, a door engine, a 'rnagnet for controlling said engine to cause the opening or closing of a door, a circuit closer for said magnet, and a counter electromotive force magnet, connected across the terminals of the car-propellingmotor and acting automatically on the said'circuitcloser tocause theclosing of .the door'by the starting ofsaid motor and-its opening by the stopr is fi ai met i- 3. In car-door operation, a controlling magnet for controlling door engines, a selector switch for directing current to .one or more ofjsaid controllingmagnets, a circuit closer vin a circuit leadingto said switch, and a counter electrornotive force magnet for said circuit closer connected across the. terminals of,the.car-propellingmotor and acting automatically on said;circuit-closer-to cause the closing-of the-selected door, or doors by the starting offs aid motorand the opening thereof by. stopping of saidmotor.

4. In car-door operation, a controlling magnet.- for controlling-a door engine, means whereby." said magnet, when, energized, vwill cause a door-opening movement of the said engine and when (leenerglzed wlll cause a door-closing movement thereof, a circuitcloser in the circuit of said magnet,.and a counter electromotive force magnet connected across the terminals of the car-propelling motor and acting automatically on said circuit-closer to cause a door-closing movement of said engine on the starting and a dooropening movement thereof on the stopping of said motor.

Signed at Albany, county of Albany, State of New York, this Qth day of December,

, ERNEST MURPHY.

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