US981865A - Trolley-retriever. - Google Patents

Description

R. F.' LEvBNs L A. H. WHATLEY.

TROLLEY BETRIEVER. APPLICATION FILED DBC.7, 1907.

Patented Jan. 17, 1911.

Z SHEETS- SHEET 1.

elf( I 31.)

R.`F..LEVBNS & A. H. WHATLEY.

TROLLEY RBTRIBVBR.

yAPPLIUATION FILED pEo.7,1907.

Patente@ Jan. 17,1911.

2 SHEETS-SHEET 2.

[gruwel/brow.

narran srarns rarnnfr carton ROSCOE F. LEVENS AND ALFRED H. WHATLEVY, OE PROVIDENCE, RHODE ISLAND, AS-

SIGNORS, BY MESNE ASSIGNMENTS, T THE AMERICAN TROLLEY RETRIEVEE, COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

TROLLEY-RETRIEVER.

Specification of Letters Patent.

Patented J an. 17, i911.

vApplication filed December 7, 1907. Serial No. 405,578.

through the rheostat, which shall authmatiJ cally haul down on the said rope,--this mechanism, however, not interfering with the proper manipulation of the trolley and the free movement of the trolley pole as long as it remains in engagement with the wire; a further objectof our invention being to countcrbalance the upward spring of tht` trolley pole both in drawing down and returning the trolley to place by means of compressed air so that the operator is not obliged .to manipulate the trolley pole against the upward pulling tendency of the spring.

Our invention consists particularlyY in the use of an electromagnet in circuit with the rhcostat which automatically trips or releases compressed air mechanism connected to the rope.

It -also consists in vthe arrangement of parts and details of construction set forth with particularity in the claims appended.

ln the drawings, Figure 1 is a side elevation partly sectional of our retriever, showing the piston just prior to its initial movement. Fig'. 2 is a plan view of Fig. l, also partly in section. Fig. 3 is slide View partly sectional of the rear end of the rct1'iever,"with the parts in their normal position. Fig. 4 is a top View of the air valve, and Fig. 5, is a section of Fig` on the line y Like reference characters throughout the several views designate like parts.

2 designates a bed plate which may be any convenient portion of the ca r. Supported on standards 3 from the bed plate is the compressed air cylinder l closed at both. ends by the cylinderl heads 5, 5 of any ordinary construction. The head 5 1s provided with a stuiiing box 6, such as commonly used through which passes the piston rod 7, having thereon the piston 8, provided with suitable packing 8. so as to have an airtight engagement with the inner face of the cylinder. The head 5 is provided with the u'ackets 9 cast or otherwise formed thereupon in which is mounted the pulleylO over which the trolley rope la passes,-the lower surface of the barrel of the pulley l0 being below the lowest point of the cylinder 4 and the standards heilig' pierced for the passage of said rope as at 8. The upper side of the cylinder 4 is provided with upwardly exf tending brackets at supporting a spring actuated reel Il to which the end of the trolley rope is to be attached and on which it is to be wound. In the construction illustrated the brackets 4 are provided with bearings through which passes a shaft 1l. This shaft carries the reel 1l. At one end the shaft is keyed to a ratchet wheel 13. The interior of the reel ll is hollow as shown and provided with a coiled spring l2 which is attached at one end to the circumference of said reel and at the other to the bearing in which the shaft 11. is supported. It is to be understood, however, that any other construction whereby a retracting revolution is given to the reel 11 is within the spirit of our invention, provided it attains the object intended, namely to keep a constant strain upon the trolley` rope 14E under normal con ditions, and when the trolley wheel is upon the wire. In other words, the reel 11 is designed to take up slack and keep the trolley rope taut at all times. Fronmthc reel l1 the trolley rope la passes around the pul- -ley l5 mounted in ar yoke 1G upon the end of the pistou rod T. This yoke, as will be seen in the plan view moves backward and forward upon the guide rods 17 which are attached to the cylinder head k5 on opposite sides thereof. At their rear ends the guides 17 are supported in standards 17. From the pulley l5 the trolley rope 14 passes, as before explained, through the openings in the standards 3, 3 to and around the pulley 10 and then upward Osthe trolley pole, heilig attached to the same at or near its `middle and suitably insulated therefrom.

The particular point of attachment of the rope to the trolley? pole is notgif-particular" A that the ree l,a1one is difficult to handle after Cit the opposite ends of each of said passages in one position, and the other of said pasl.for flfotating'therreel 11 is strong enough vtof-taire up the 'ordinary slack, but; such a .actuated,...npr'would it be' strong enough for must.

.by the actuation of the operator. The means importance except that it is to be so placedl as not to befin the way of the'usual trollejr ropes ,'It'is to be understood that the spring vl2 l wheel would not be quick enough to immediately draw down upon'atrolley pole when this purpose. In addition it may be said for this purpose comprises a casing 18 having therein a rotatable four-way valve actuated as will belater described, conducting pipes 19', 20, leading from said valve casing one to each end ofthe cylinder, an inlet pipe21 for compressed air, and an outlet pipe 22.

'The four-way valveused by us is of the ordinary coi-istruction and is shown in detail in Figs. .4 and .5'. It .comprises the barrel 24 rotatable within the casing and provided with'theoppositel'y disposed passages 24;

being adapted to connect with .the inletf2l and with the pipes 19 or 20, one f said passages 24being adapted to connect between.. the inlet and the pipe 20 when the Valve is sages at this time. connecting between the outlet and the pipe 1'9. This connection of course is reversed when the valve is turned in theother position. It'will be seen from this that upon the rotationI of the .valve through the' arc of a circle, air will be adl 'mitted either to one end or the other of the cylinder and allowed to escape from the other. The mechanism is so arranged that f vwhen air is adinitted'to one pipe the piston is at the end of the cylinder adjacent thereto in .which said pipe opens, the pipe of course l opening vin the clearance-behind the piston. I Attached to the spindle of the valve barrel 24 are thethree radially projecting arms 26, 1

. 27 "and-'28, As we have shown the .construcl tion these arms are attached to a sleeve which formst'he barrel 24 whichA in turn isfixed uponthevalve spindle 23.` To one of these i arms is attached a' rope or other` connection l- 28 leading to-v the -cab of the trolley car j or tof-anyother convenient point,rthe,rope

being' for the purpose of' actuating the com- 'pressed air valve, to release the rope 14v and move it back again to the trolley wire after the trolley wheel has been drawn down,

as will be later described. The arm 27 carries at its end an armature 27 adapted to contact with the poles of an electromagnet 30, which is'suitably su ported from the cylL inde-r lframe as by Jhe jltiraclftet 30 bolted or otherwise attached to said cylinder and which is in shunt with the ca r motor. This electromagnet may be of any suitable construction but must have suiiicient strengthto normally hold the armature 27Vl and t-he arm 27 in contact with it and against the action of a spring latch now fto' be described.`l

31 designates a pawl whose detent end is adapted to engage with the ratchet. ofthe reel 13 on the shaft 11. This pawlf'is mounted on a sleeve 31 which rotates upon a fixed shaft 32. The inner end of the shaft is received and supported in a socket bearing 32 formed on the upper side. of cylinder 4,v the shaft projecting'outward to a point beyond the outer face of the `valve vcasing 18. At its outer end Athe sleeve 31 Acarries the downwardly extending tappet finger 33 which at its lower end is rearwardly inclined as at 33 and has a rearwardlyand downwardly Yinclined face. In alinement with the tappet finger 33 is the arm 26'of the rotatable sleeve'on lthe barrel 24, the extreme lower corner of the finger 26 being cut away on an `incline to form a cam face to Contact with the inclined inner face 33 of the finger and to move against said iinger, thus forcing the pawl 3l away from engagement with the ratchet 13. In its normal position when the armature 27 is in contact with the electromagnets 30, the extremeend of the arm 2G bears against thenger 33 and thus holds the pawl out of engagementwith the ratchet as shown 'in' Fig.`3. When', however, ,curn rent in the magnet 30 ceases, as when the trolley slips off thel wire, and the current from the wire. ceases to pass through the rheostat of the car -to which the magnetv wiresv lead, then the weight of the arms .28 and 27 will turn the rotatable piece 24 whereupon the spring 34 attached at one end to the nger33 and at the otherl end to' the arm 28 throws the .pawl 31 into engagement with the ratchet' tooth of the reel 13 which happens to be opposite. The reel 13 is thus held from turning immediately upon the cessation of current in the rheostat and at the vsame time the four-way valve is opened, compresffd air Aenters behind piston'8, 'and the istonfis forced' 'forward through the '.cyliiioer carrying forward the pulley 15 and dragging downward upon the auxiliary# trolley rope 14.

-It-y will bei seen trolley .pole .will be drawn downward just y thatthe'wheelil as ar? rangedv acts asa pulley and-hence thatthe twice thclength of the stroke of the piston S. `This stroke need not be long as only a slight depression of the trolley pole will be i suiiicient to draw the trolley pole downward sutliciently far to get it out of the way oi the supports'oi the cable. As long as the valve and' the Arotatable sleeve are in the position shown in Fig. 17 (in which position it is to'be understood the piston will 10. have been driven from the position shown in Fig. 1 tothe opposite end of the cylinder 4),thep1 illeyfl5 will be held at itscxtended position and vthe auxiliary trolley rope 141 drawn' down. When however it is desired to ireplace the trolley it is only necessary to pull uponthe yrope Z8 'when the rotatable 'sleeve'willturn and the arm 26 will free the -pawl 31 from lthe ratchet wheel 13; At th same time the valve 24 will be-turned to adv 4mit compressed .air to the pipe 19 and hence behind the piston whereupon the piston will vb`e'mmfed1to the'other end of the cylinder (to theposition shown-'in'liig- 1) slackening thefrop'eflii. l lIt'ris-tfobe noted'fthat thepeculiar form of valveivhichrwe'use permits theescape of air from one Side of the piston while air is being admittedo'n-the other side-of the p iston. Inl order that the-m'otorman or operator may 13o be''notified"tl1at"the troll-eyl'is-ott', wev have :provided the-whistle 35 upon the compressed lair outlet from the cylinder, this `Whistle being .operated bythe passage of the compressed air 'from the cylinder as the piston 35 is movedforward upon theautoinatic actution of the-retrieving mechanism, i

While we have referredV to compressed air as themednnn used for forcing out-the pisl ton,wc' wish it understoody that we do not` 40 confine ourselves thereto as We regard the use of an fluld capable of being orced'into the cylin er to force out the'piston as within the spirit of our invention.

With our construction, We provlde a slack- .45 take-up reel with a comparatively light spring strong enol'iglrto reel up the slack of the rope but 4not strongenough.todraw down upon the-trolley. and we provide adjunctive devices Ioperated by compressed air which will ac t to draw down upon the trolley when the wheel leaves the wire but under such controlthat b v operating the valve the comin'essed air may. be used to replace the trolley or to instantly relieve-thc torce which 55 drawing downward upon the trailley repel It will be seen that our mechanism pro- "wides for the constantoscillation ot the trolley rope audits constant*tautness.' and that the withdrawal of the trolley is not dependy ent upon any spring orlothel" llike device which is liable to lose itstensiou and to be-v come less lid less operative, but upon a positivefilnpulse automatically given which 'wi 1. remain precisely the same no matter how `many-years .themechnismfis operated,

[ consistent with the condition ot the various i' parts. l

Our device is compact'. simple and entirely positivo in its operation.

ln practitfal operation this retriever acts automatically'and iustanty to draw down upon the trolley rope and to instantlyrclnovo the trollo)rv from the wire, (l1':i i1i the trolley pole downward out of chance contact with the stays lor guys suppmtiing, the i'ecd wire.

In order to provide 'in practice lor the temporary cessation ot' current in goingl over 'cut-outs, i'rogs or other little irregularities, tho tinax elapsingr utter tbc current is broken before the pole is drawn down can be accuratelyv controlled and predetermined by the relativeI sii/,e ot the air ports used. .ln other words, the break will be practically momentary and before the apparatus can act. the current will again be on and the armature will again be drawn upward to posi- 28 and the pawl arm 32:3 may also be calcalated to this end or abandoned entirely. re-

t-he parts.' 'It will be obvious also that any voluntary breaking of the circuit will cause the retriever to act and thus that with electrical connections which are obvious to anyone skilled in the art-it is within the power of the inotormah to break a circuit through his car and thusdraw down the trolley pole to meets'pecial conditions of the wire, as for instance' when the wire connections are brokem when 1tackle is being` used for making 1'epairs,or the feed taps are broken, thus by pushing a: button or throwinga ,switch the mechanism can be immediately operated, obviating the chance of the pole strikingl obstructions and doing damage.

Another important advantage of our' device consists in the fact that when the circuit breaker 4in the powerhouse is blown out, the'poles on all cars usingr this device gare immediately pulled down without delay and automatically. This is very important as it allows the attendant at the power bouse to get the breaker in again and allows the engines to pick up load gradually and before the complete momentum of the cycle is lost. lWluireas if the breaker blows out and all the.motormcn began to' pull 'on the line at once-an excessive overload strain is burning out generator-seem. l

Tt will be seen that no more movement is required-for resetting' this mechanism than 'is nowr`equired to replace the trolley pole Without the retrievers.

claim 1s: v y

' 1.- A trolley retriever 'comprising la cylintion. The spring' which acts upon tbc arml lying, upon the action of gravity to releaseplaced on the engine thus [using more coal,

dea a piston the/rein e flexible `connectionl leading-from a to'lley -pole and vconnected to llaving-de5ribed our invention what we said piston,a source of compressed airlcomf municating with both ends olf-said cylinder, and .electrically controlled means for open# ingsaidv cylinder at oneend for theadmission of compressed air. and'for openi-ngsaid cylinder at' theother end furthe extrusion of air behind-the pistoni for v'draWin down u.pon the trolleyz'pole, the electrical y con- 'trolled means belng connected circuit` through the trolley -Wheel whereby upon the' trolley Wheel leaving the wirethe said elec#v trically controlled means shall be positivelyA denergized to' permit Va positive (depression olf the pole, the electrically operated means constructed to lhold the rope drawinglmeans out oi v/operation-'While the trolley wheel in contafctyivith'the trolley Wire.

Q. A' 'trolley retriever "constructedfto insure a `positive depressionfoffthe ti'olleypole and apositive release thereof, the same com- -prisinga cylinder, a piston therein, flexiblecormections' from-the piston to. a trolley pole operating 'to draw down upon the pole a when the piston moves in one direction, electrically-operated means acting to .hold the ro`pe-dravvingmeans from operation While the trolleyvv'hcel isxin Contact With the trol-y ley--,Wi re, a :valve .for admitting compressed lair at either end of ,the-,cylinder behindthe piston,' saidifvalvei being normally held in such position as to prevent 'the ladmission of air-.to oneA end vof the cylinder, the means for; holding the valve inrits closed'position being releaseduponv the 'trolley Wheel leav-vl ing the Wire', whereby the valve may beoperated hy thervalVe-opemng means, means tending;v at all times to open' the valve against said .holding means, vand hand-actuated means lor operating said'valve to conductv air to the. otherend'of said cylinder.'

. In -atrolley retriever,1afreel normally acting to take up slack in the trolley rope,.

`combined AWith means forholding'said reel i1-om' unwinclinggv and means forndrawn'g down upon said rope when thetrolley wheel lcavesthe Wire, said last-named means embodying an electro-.magnet holdingr said means out .of operation, said elcctroanagnet being so connected as to be' deenergiz'ed -When'the'trolley wheel leaves the Wire.-

4. In a trolley retriever, `means for holdsaidwheel and the means for holding the free end of, the trolley rope; an electro` ymagnet acting'yvhen energized to holdz said pulley extendlng mecha'nlsm from opera-v tion, said electro-magnet being so connected to the trolley Wheel .that it Will be denergize'dupon the trolley Wheel leaving the Wire; g l

' 5. In a'trolley retriever, aspring reel roi tat'ableinboth"directionsand"normally act ling to take up slack inthe trolley rope.; in

combination With means for holding the tdo'wn upon-said rope,.'a spring normally acting to .throw into. action `the reeleholding` i meclanism and the mechanism for. drawlllg.. eratedmeans acting to hold the .reel-holding mechanism out of engagement with the Ireel from movement and means for drawing` .1.1115011 the,ropedndelectcauy Opp lreel andthe rope-drawing mechanism from 'y operation while the trolley wheel is in 'con-, tact With the -trOHeyWre j 6. In a trolley retr1eVer, -a s"pring ree-l for normally taking up the slackl of the trolley.

rope rotatable both directions; a com# Y pressed' air cylinder; 'a piston said v.cylinder connected to saidtrolley rope; a valve I for admitting compressed' air t0 said cylinder behind the piston normallyheld closedy a. paw] normally held outfoffcontact with said reel but adapted to engage with lthe same tov prevent the unwinding ofthe rope;

and means for holding said pawl out of engagement and--for holdingsaid 'compressed out o f operation when-` the trolley wheel air valve closed, said means beingthro'Wn leaves the-wire to permit the valve and pand to operate."

- 7. In a trolley retriever, spring reel for.;

- normallytaliing up theslack of trolleyrope -rotatable 'in' both' directions; a' compressed leyiover AWhich the trolleyrope passes; a yalve' 'oradmitting compressed airto said cylinder behind the pistomzsaid valve being normallyl closed; .a paWl normally held out of' contact 'with' the reel but. adapted to enT `gage'vvith the same to stop its rotatiomsaid spindle being'providedwith an arm engag-4 ing With the pawl to hold it out of engage-l ment With thereel; and an electromagnet holding said'valve closed and vthe 'arm thereof in engagement with the. pawl, said electro-magnet'being so connected to the trolley Valve being mounted upon a spindle, said wheel as `to be denergized when thetrolley l wheel leaves the Wire.

8; Ina 'trolley retriever, a spring reel for normally taking .up the .slack ofthe trolley rope yrotatable in both directions, a compressed air cylinder, a piston rod projecting 'from saidcylinder and vcarrying at itsend a pulleyv over which the trolleyrope passes,

.said-cylinder normally closed, akk latch nOrmally held out of contact-with Said reel,

a valve for admitting compressed. air to vmeans ior opening' the inlet'ivalve Othe..

cylinderr` and an electromagnetnormally ont of engagement with the reel, said electroliolding said valve closed and'- said latchl magnet being so electrically coimectedfl with the trolley Wheel that.the current'-v thereto is interrupted by Vthe trolleyjWheelA leayin'g` the Wire.

9, In a-trolley retriever, a spring reel for .l q u A l l vair cylinder; la piston rod proJecting from said, cylinder and,carrying.v atvits end a pulvalve in said inlet pipe closing or opening one or the other passage respectively, and

means for holding the said reel from rotation and opening said inlet valve'to admit air behind the piston upon the trolleycwheel leaving the feed wire. d

10. 1n a trolley retriever', a spring reelfor normally taking up the slack ofthe trolley rope rotatable in both directions, a compressed air cylinder, a piston rod projecting from said cylinder and carrying at its end a pulley over which the trolley rope passes, an air inlet pipe having branches leading to both ends of said cylinder, a rotatable valve yin said inlet pipe closing or opening one -or the other passage respectively, a latch normally out of engagement with the reel but adapted to engage with the same to hold it from rotation, and radially' projecting arms on said rotatable valve, one of said arms adapted to normally hold the latch out of engagement with thereel, the other of said arms carrying` an armature, and an electro'- magnet` adapted to attract said armature and hold the otatable valve in one position, means for drawing said armature away when current through the electromagnet is broken, said electro-magnet being electrically conneel-ed uit-h the trolley wheel so that current. therethrough is broken when the trolley wheel leaves the wire. I

'11. In a trolley retriever, a spring reel for normally taking up the slackiof the trolley rope rotatable in both directions, a com-- pressed air cyliiulcr, a piston rod projecting from said cylinder and carrying at its end a pulley over which the 'trolley rope passes, an air inlet pipe having branches leading to both ends of said cylinder,I a rotatable valve in said inlet pipe closing or opening one or the other passage respectively, a latch normally out of engagement with the. reel but adapted to engage with the same to hold it from rotation, three radially projecting arms on said rotatable valve, one of said arms adapted to normally hold the latch out of engagement with the reel, another arm having a connection whereby the valve may be manually operated, the other of said arms carrying an armature, and an electromagnet adapted to attra'ct said armature and normally hold the rotatable valve in one position, thus opening the inlet valve and allowing the said latch to engage with the reel, means for drawing said armature away when current through the electromagnet is broken, sa id electromagnet being electrically connected with the trolley Wheel so that` the current therethrough is broken when the trolley Wheel leaves the Wire.

12. In a trolley retriever, a spring reel for normally taking up the slack of the trolley rope rotatable 1n both directions, a ratchet on the shaft of said reel, a compressed air eylinder,"'a piston rod projecting from said cylinder and carryingk at its end a pulley over which the trolley rope passes, an air inlet 'pipe having branches leading to both ends of said cylinder, a rotatable valve in said inlet pipe closing or opening one o r the other passage respectively, a pawl normally out of engagement with the ratchet on the reel shaft but adapted to engage the same to hold it from rotation, three radially projecting arms on said rotatable valve, one of said arms adapted to normally hold the said pawl out of engagement with the ratchet, another' arm having a connection whereby the valve may be manually operated, the other of said arms carrying an armature, and an electromagnet adapted to attract said armature and normally hold the rotatable valve in' one position, meansfor drawing said armature away when the current through the electromagnet is broken, and thus opening the inlet valve and allowing said pawl to engage with the ratchet, said electro-magnet being electrically connected with the trolley Wheel so that the current therethrough is b1'oken,when the trolley wheel leaves the wire.

13. ln a trolley retriever, a longitudinal cylinder, a piston therein having a -piston rod )injecting out through one end of'said cylinder and carrying at its end a pulley over which the trolley Iope passes, a spring reel mounted upon said cylinder to which the end of the trolley rope is attached after passing over the piston pulley, a ratchet on the shaft of said reel, a paw-l adapted to engage with the said ratchet to hold the reel from movement but normally held out of engagement with said ratchet, an inlet pipe from a source of compressed air having passages leading to both ends of said cylinder. a1'otatublc valve iu said inlet pipo adapted to he turned to direct the air into one or the other end of thev cylinder, an armature mounted on the spindle of said valve, an electromagnet adapted to electrically engage said armature and to hold said inlet valve closed, said electro-magnet being electrically connected with the trolley `wheel so that it will be denergized when the said trolley wheel leaves the wire, an arm projecting from the spindle of said valve holding said pawl out of engagement with the reel shaft ratchet when the armature is engaged With the electromagnet, and means for manuali)F operating said valve for admitting air to the forward end of said cylinder for rengaging the armature With the electron'iagnet and for releasing the paWl from engagement with the reel shaft ratchet.

14. In a trolley retriever', a compressed air lcylinder having a piston@ therein, a pulley mounted upon said piston over-which the trol- 'ley rope passes,"meansforfholdingthe .end of the trolley rope, an inlet pipe for compressed air, passagesleading from said inlet pipe a to both ends of the cylinder, a valve in said inlet pipe.adapted-to direct compressed air into one or theother of said passages, means for operating said valve upon the disengagement ofthe trolley Wheel with the feed Wire4 whereby compressed air shall be directedy behind .the piston to force it outward, and

means'operated by hand for actuating said valve to direct air in front of said piston, to retract it, and electrically operated means constructed tovhol'd the rope drawing means out of Operation While the trolley Wheel isin l .contact with the trolley Wire.

15. A trolley retriever provided with mechanism 'for drawing down upon the trolley rope, an armature associated there" one armof saidarmed member and controlled byvsaid electro-magnet constructed to hold the reel stationary and toprovide a fnlcrum for the trolley-draW-down machanism to Work on. 4 16. A trolley retriever having a spring reel tor keeping a constant tension npon the trlleyrope; means for locking said reel' immediately upon the trolley wheel leaving the wire; a .trolley rope leading from said reel to a trolley pole; an electromagnet connected in circuit with the trolley Wheel; and mechanisni adapted- .to engage With and draw' down upon said rope held out of 4lease of the latter, an means denergized when the trolley leaves ing to takeup slack in thetrolleylrope, eombined with a cylinder, a piston therein,

means for admitting luidfup'on either side of the piston, a connect-ion. between said piston and pole for'in'su'ring ajpositivel def' pression of thel trolleyio'le `and a .positive reting means.

18. In a trolley-' retriever, a cylinder, a double acting piston-therein, means for conmeeting said piston with the trolleyrope, and means for admitting` compressed air on one side of said piston to depress thejpole,` and means for admitting compressed air t0 the other side of said piston for the return stro-ke of the piston to return the latterto its original .position and 4eleetricall .operated means acting'to holdthe rope rawing means from 'operation While the trolley wheel/is in Contact with theltrolley Wire.

v19. In a trolley retriever, a cylinder, la double acting piston therein, means for connecting said piston With the trolley rope,

the Wire. for controlling sa-id fluid'admitelectrically operated means forA admitting compressed air on one Vside of s aid piston to depress the pole, and

means for admitting compressed air to the other side of said piston for thefreturn stroke'of the-piston to` return lthe latter -t0 its original position and electricall `operf ated means acting to holdythe rope7 rawing means from operation While'zthe trolley wheel is in contact with the trolley wire.

ln testimony whereof, we'r have .signed our names to this specification in th'e presence of two subscribing Witnesses, this 19th' day oi September, 1907.

ROSCOE F. LEVENS.

ALFRED H. --WHATLEY- 7Witnesses:

H owann E. BARLoW, E. LOGDEN.

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