US1708114A - Motor-controlling apparatus - Google Patents

Description

HJSJ M N. E. BAKER MOTOR, CONTROLLING APPARATUS Filed June 11, 1928 E. m O m K Q W N n WMU. WN @w um mw @MJ EN MW um Sw vm mw wm. am um wm Nm NN NN NN am m QN mm Q mw w@ 1 1 1 amw m.. N 1 uvm. QN @Naw mow Nm Patented Apra 9, 1929.

entre titane n stares earsarerries,

NORVAL E. BAKER, OF BLUE ISLAND, ILLINOIS, ASSIGNOR TO THE UNION SWITCH &

SIGNAL COMPANY, OF SVJISSVALE, EENNSYLVANIA, A'CORPORATION OF PENN- SYLVANIA.

Applicativi mea :rune 11,

My invention relates to motor controlling apparatus and particularly to apparatus for controlling a motor from a remote point. Apparatus embodying my invention is particularly adapted for, though in no Way limited to, use in railway braking Asystems comprising a braking bar located in the trackway and actuated by a. motor controlled from a distant point.

l will describe one form ot motor control# ling apparatus embodying my invention, and will then point out the novel features thereof in claims.

The accompanying drawing is afview, partf ly diagrammatic, illustrating one form of railway braking system including motor con trolling apparatus embodying'my invention. Referring to the drawing', the reference characters 1 and @designate the track rails o'a` stretch otrailway track.` Located on opp'osite sides of rail 1 and extending parallel therewith are `two braking bars 2 and Similar braking bars 2a and3a extend parallelV with rail 1a on opposite sides thereof.

The braking bars 2, 3, 2L and 3fL are operated by a. motor, which as here shown is of theilui'd pressure type and comprises-a cylinder A containing a reciprocable piston 14 to which is attached a piston rod 13. The braking barsV are operatively connected with the piston rod 13 through suitable linkworlt including a bell crank 5 and a. lever et pivote'd at point 4t, 1When piston 111 moves to the lett each braking bar is moved toward the associated rail into its'bralri'ng position in' which it engages thevside of a wheel of a railway vehicle traversing the rails 1 and 1a. When the pistonlL moves to the right,`however, into the position in which it is illustrated in the drawing,the braking bars are moved away frornthe associated rails out of engagement with the wheels of a passing vehicle and the bars then occupy their non-braking positions.

The supply of fluid pressure, usually con1- pressed air, to the cylinder A is controlled by main airV valves 27 ,30, 33 and 35, which main valves are in turnV controlled by three electromagnetic pilot valves 1R, P and N. Each of these pilot valves comprises a valve body 18 having a valve stein 19 therein controlled by a magnetdesignated vbyv the reference character 17 with a suitable distinguishing exponent. The valve stem 19 is biased to its lupper or normal position by a spring 20 and when in such MOTOR-CNTRQLLING APPARATUS,

1928. Serial No. 284,329.

position connects the associated pipe 22 with atmosphere through a vport 21. When magnet 17 is energized the stem 19 moves downwardly against the bias eXerted by spring 20,

to its reverse position, and the associated pipe 22 is then disconnected from atmosphere andl is connected with' la source ot iluid pressure, not shown in the drawing, through pipe 38.

The main air valves are located in a valve body 39. This body contains a cylinder having a reciprocable piston 24 therein. The upper side of this piston is subjected tothe pressure in pipe 22 from valve R, Carried by Vpiston'2d is the mainvalve 27 biased to its upper or normal position 'by spring 28. When valve R is de-energized,'piston 24 and valve 27 are in Atheir upper positions and port 37 is disconnected from port 25 and pipe 15 leadingv to the turn 'controlsthe main air valve 30 adaptedv to at times connect port 25 witlratmosphere through port31. vl/Vhen valve l? is cle-energized and valve 27 .is closed, pistonv29 and valve 30,1nove into their lower positions in which they are shown:v in` the drawing, under the influence of gravity.yl l When valve 27 is open, however, fluid pressure in port 25 will raise valve 30, allowing this fluid pressure to exhaust to atmosphere through portA 31 unless valve l) is energized. When valve P is energized, the upper side oit piston 29 is veX- posed tothe pressure in the associated pipe 22. Since the area of piston 29 is greater. than that of valve 30, the valve 30 will then beheld in its lower position even if valve 27 is open, and communication between portsv25 and 31 will thus be interrupted.Y y l l y l u similar n'iannervalve N'controls Athe pres sure appliedv to the upper `side of piston 32 reciprocable vin valve body 39 andcontrolling the two main air valves 33 and 35. A spring 36 biases the piston 32 and the valves con-l trolled therebyv to their upper-positions Vin whichl pipe 1,6 leading to the left-hand end of the cylinder A is connected with atmosphere through' port 40, valve 33and VportY 3st. VV-hen kvalve N is energized,'pressure from `pipe 22 lpressure to theilett-hand end ot Cylinder A through port 37, valve 35, port 40 and pipe 16. The pilot valves :l-,P and N are controlled by a series of pressure responsive devices D,

E and F each comprising a Bourdon tube 12 communicating uf'ith the right-hand end oi" cylinder A through a pipe 6. Each Bourdon tube 12 controls. a contact arm 7 which engages one of the associated fixed contacts7.EL or 7' according tothe `pressure in the cylinder. Y The devices l), E and l" are adjusted to operate upon diilerent pressures so that as 'the pressure in the Ycylinder increases these devices operate successively, When no pressure exists inthe right-hand end of cylinder A, all contacts 7 7LL areclosed. il] hen the pressure in the cylinder reaches a predetermined low value, such for example, as 25 lbs. per square inch, contact 7 7EL Voi ldeviceD opens. `When the pressure exceeds this value, contact7 7bgof device D is closed. In similar manner vdevices, E and l? operate as the pressure reaches and exceeds certain higher values such i'or example as 60 and 75 lbs. per square inch, respectively.

rlhe magnet 17R ot pilot valve may be controlled by contact-7 7@ of any one of the devices 1)11, or F, dependingupon the .Y position of a selector designated by theV ref-` erence character H.- The. selector H may be located at a point remote from the braking apparatus, as in the control cabin of a classification yard car retarder system, and in the lform here shown, comprises a manually oper- Aable lever 8 adaptedk to engageV any one of v'several lixed contacts 10N, 1OD,1QE, 10F or 10i". rihe selector H alsofcomprises a segment contact lOPso disposed that when lever 8 engages any one oit the contacts 10D, 10E, 101", 0r 103, the lever also engages Vthe segment contact 10P, but tliat'lever 8Y does not engage` segment 101.j when contact 8 10N is closed.

lllagnet '17p is controlled in part by a relay G which is in turn controlled by a selectedv one o12 the devices D, lll or l?, depending upon the position of selector H, as will appear hereinatter. Y f Y f .v rl`he selector H controls the .supply of energy to magnets 171", 171, and 17 N, from a source oi" yenergy such as a battery` 51 having one terminal constantly connected with one terminal of each ol the magnets through a wire 541-. The other terminal of battery l51l is connected with lever 8.V e i. .l As shown in the drawing, allco'ntactsof the selector l-l are open, and all valves'R, llj and N are cle-energized, so that valves 27 and 35 are closed and valve 33 is open. Valve 30 is clos d dueto the weight of piston 29. Pis ton .14; of motor A occupiesits right-liand position, and the braking bars are retracted to their non-braking positions. The supply )f of pressure to both ends-oit the motor A is .tained at 25 lbs. per square inch. Y

ln similar manner, it lever 8 is movedin'to interrupted and contacts 7 7@ of` all de-i vices D, E and F are closed. Relay G is deenerized. I erator actuates selector H to closefcontact 8 1013. Current then Hows from battery 51, through contact 8 10D, wire 57, c.ontact.7 7a of device wD, wires 58 and .59,magnetv17R ot pilot valve R, and wire 54 baclrto batteryy 51.A

will now assume that the ,op-V

At the same time, current flows from battery- 51 through contact 8 10), wire 65, back contact 66 et relay G, wire67, magnet 171 oiy valve P, and wire 54 back to battery y51. Valves R and P are both energized, therefore,

so that valve y3() is held closed, andvalve 27 is opened to admit fluid pressure through pipe 15 to the right-hand end of motor A. The braking bars are therelfore moved totheir braking positions. lfJhen the pressure injthe motor reaches pounds per squareY inch, contact 7 7@ of device D opens, interrupting the circuit for magnet 17B, and allowing valve 27 to close; ever 'so that the pressure is maintained in the motor. lt the pressure ,in the motor becomes greater than 251bs. per square inch,.contact 7 7b ot devicel)` will close,'and current from battery 51 will owthrough contact 8 1OD,

Valve remains closed how` wire 57 contact 7 7b wires 17 and 43 winding of relay Gr, and wire 5st back to'batteryv 51. Relay .G willV then become energized, opening, at bach contact 66, the circuit :tor magnet 17T. Valve 30 will then open to conneet the right-hand end of motor'Awith at-V e' mosphere. Vllfhen the pressure has V.beenl re-y duced to 25 lbs. per equareinch, contact 7 7 of devicerl) will open,`aiid relay Gwill close .tore-energize magnet 1.71. llt Vwill be seen,

therefore, that when lever 8 is niovedfinto Vengagement with contact/10D, the'rp'ress'ure in the right-hand end of the cylinder is inain Vles engagement with,y Contact 10E, current flows, V

'from batter 51 throiwh coiitact3 10,-E wire a 'l' rf? 1 b' *a 7 60, contact 7 7 L of device la, wires 61, 58 and 59, magnet 17B, and wire 511'baclrto battery Under `these conditions contact 8 1OPv Y lll) 8 1OE, wire G0, contact 7 7" yotdevice-E,YY

wires VZ19 and 4:8, winding of relay G, and wire 5d back I to batteryA 51. .Relay G therefore opens bach contact 66 to openvalve 30 until the pressure ydrops to lbs. per square inch.

-' YV hen Contact 3 1O1f` ot'selector H is closed,

the circuit for magnet 17R is from battery 51, through contact 3 1OF, wire V62, contact17 7a o1 device F, wires 63, 61,58 and 59, magnetA 1YR, and lwire back to battery 515Y The pressure is then maintained at'75 lbs. per square inch, and if this value is exceeded,

y the cylinder is' then exhausted until the rewhich the lever then occupies.

current from battery 51 flows over contact f5-10F, wire 62,. contact y7e-7h' of device F, wires 50, 49 and d8, winding of relay G, and wire 54 back to battery 5 decrease the pressure in the motor to the value at which Contact -Tb of device F opens. Finally, when contact 8--10R isclosed, current is supplied directly to magnetli'R and the full fluid pressure existing pipe 38 is then supplied to the motor.

If the operator wishes to restore the appa'- ratus to its normal condition, hefirst moves the lever S to the position in which it is illusl trated in the drawing, so that contact 8-101 isvopen, thereby cle-energizing magnetsY 17p and 17, and allowing the fluid pressure in the right-'hand yend of' cylinder Ato exhaustl to atmosphere through valve and port 3l. Thev operator then closes contact 8-lON, thereby reversing valve N, and supplying fluid pressure to the left-hand end of cylinder A. The piston 1st then returns to its righthand position and the braking bars are moved to their Vnon-braking position. If the operator then opens contact fie-10N, the consequent cle-energization of magnet 17N restores the apparatus to its normal condition by venting the left-hand end of cylinder A to atmosphere through valve 33 and port ,34.

It should be particularly pointed out that if lever 8 is moved to a position correspondingto a lower pressure than that existing in cylinder A, relay Gvwill immediately become energized to open valve 30. The pressure in corresponds to the position By this automatic pressure reduction, the apparatusalways insures that the pressure in the cylinder exactly corresponds to the lever position.

Although I have herein shown and described only one form of motor controlling apparatus embodying my invention, it is understoodthat various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is: l

l. In combination, a fluid'pressure motor,

sultant pressure a first magnet for controlling Vthe admission of'fluid to said motor, a second magnet for governing the exhaust of fluid from said inotor,'a relay at times controlled in accordance rwith the pressure in said motor, a manually operable lever, a circuit for said first magnet Vcontrolled by said lever, and a circuitfor said second magnet controlled by said lever and by said relay.

2. In combination, a fluid pressure motor,

a first magnet'for controlling the admission of fluid to said motor, a ysecond magnet for governing the exhaust of fluid. from said motor, mechanism responsive to the pressure in As a result, mag-v net 17p 1s fle-energized and valve 30 opens tosaid inctor, a manually operable lever, a relay controlled by said lever and by said mechanism, a circuit for said first magnet controlled by said lever and by said mechanism, and a circuit for said secon-d magnet controlled by said lever and by said relay. Y

f 3. In coml'ination, a fluid. pressure motor, a first magnet for controlling the 'admission of fluid to said lmotor, afsecond magnet for governing the exhaust of fluid from said motor, a plurality of contacts responsive to the pressure insaid motor and arranged to operate `at different values of said pressure, a

manually operable lever,'a plurality of circuit-s for 'said first magnet all controlled by said lever and each controlledby a difi'erent one of said contacts, a relay, means for energizing said relay when any one of said circuits Iis closed and the pressure in the motor is above the operating value of the correspondingcontact, and means for energizing said second magnet when any one of said circuits is closed provided said relay is -de-energized.

In combination, a fluid pressure motor, a first magnet for controlling the admission of fluid to said motor, a second magnet for governing the exhaust of fluid from said motor, a firstl lcontact arranged to be closed when and only when the pressure in said motor is below a certain value, a secondcontact arranged to be closed when and only when the pressure inthemotor is above said certain value, la manually controlled contact, a circuit for said first magnet, including said first Contact and said manually controlledk contact, a relay provided with a vcircuit including said second contact, and means for energizing said vsecond magnet when said manually controlled contact is closed and when said relay is deenergized.

5. In combination, a fluid pressure motor. a first magnet for controlling the *admissionl of fluid to said motor, a second magnet for governing the exhaust of fluid from said motor, a relay, manually controlled means for supplying current to-said relay or to said first magnet according as the pressure in said motor is below or above a certain value, and a circuit for 'said second magnet controlled by said relay and by said manually controlled means.

6. In combination, a fluid pressure motor, a firstmagnet for controlling the admission of fluid to saidmotor, a second magnet for' governing the exhaust of fluid froinsaid motor, a pressure `responsive device having a first vand a second contact arranged to be Vclosed. according as the pressure said motor is above or below a certain value, re-

spectively, a manually operable Contact, a relay, a circuit for said first magnet including said first contact and said manually Voperu ablecontact, a circuit for said relay including said second Contact and said manually yoper- 'able Contact, and means effective whenD said. manually -operable conaet` 1s closed and when said relayr is cle-'energized tosupply current y bers, a manually .operable lever "Connec'lerl l Willi ube-V 'lree terminals 'of said source and movable into engageuien; with a selected one of sa-icl 1ne1nbers,`a pluralityy of. fluid pressure responsivefleviees each operating lo eenneot an associated one of said eonlzzwtV nieinbers with the free. Jcerrninal of saicl relay vor Wilt-l1 tliefree terminal of said Vfirst inagnetaceorcling. as the pressure in said inoor is above or Y below a definite value which is 'different for 7. In combination, a'lluicl pressure motor,l

vdifferent devieesfancl means effective Wnen said lever engages anyfoneof Vsaid Contact members and When saldyrelay 1s energized to supply current 'to said` second magnet.

a brakingbar located inthe traelrway, a fluid,

pressure motor for operating saicl'bar, a first magnet for conrollingbeadmission of fluid to said motor a seeonclinaonet for controlf 3 b ling the exhaust of fluid 'fron'i the motor, 'a

Jluralit yoi' (leviees resUonsi-ve to 'elie'fiuicl f pressure in 'said meier, a Vvmanually operable lever, means for eentrollii said rstinairnei by a selected one of saiclfclevices:according to the position of said lever,y .a relay,v ineens Y controlled by said `lever for placing saicll relayy underltlie eonlrol ol"tbersa1ne .device Wliiehl iseoirerollingv said :rsln n'iagnet, and

a eircuitv'forvsaicl second magnetcontrollecl V'bys'aicl relay and by said lever.v r

lntestimonyxvbereof I affix inyvsignat'ure.

1 NoRvAL Resinas.

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