US983277A - Dump-car. - Google Patents

Description

P. J. HARRIGAN.

DUMP GAR.

APPLIUATION FILED MAR. 23, 1910.

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DUMP GAR.

'APPLICATION FILEJ MAR.23,1910.

Patented Feb. 7, 1911.

3 SHEETS-SHEET 2.

P. J. HARRIGAN.

DUMP GAR. APPLICATION FILLED 1111.11.23. 1910.

983,277. Patented Feb. 7, 1911. v

3 SHEETS-SHEET 3.

UinTnD STATES PATENT orniion.

PATRICK JOSEPH HARRIGAN, OF MCKEESPOR'R PENNSYLVANIA.

DUMP-CAR.

Specification of Letters Patent.

Patented Feb. '7, 1911.

i pplicationfled March 23, 1910. Serial No. 551,115.

This invention relates to certain new and useful?in'iprovements in dump cars, and relates :..o'ro particularly 'to that classj'ot cars and movable to open position to permit the discharge of the lading.

The. invention relates particularly to fan improvement in the adoors and ojfieratiim` mechanism therefor` one of the principal f objects ot the present invention,being` to pro-` vide lravit-y-closine doors and operating mechanism therefor whieh can be applied to the standard form ot.' hopper lioltoin ears without necessitating; any alteration in location ot the center lsills or other st rnctnre ot such car.

The inventioifalso has Yfor its objet-t the provision ot gravitysclgosing'aloors which may be applied to the"sta nd"ard torni ot hopper bott-oni cars and which.' are so disposed with relation to the car sides that as the lading' begins to discharge l'rom the ear` iheweight ot the heling` is' directed against the doors iti-.such manner as lo etl'eet arapid opening thereo'l, the. doors in the completely open position howcver,bein j still so disposed with respect to the, car sides, that their nataral tendency is oto automatically return to closed position when the weight ot the ladine' is ren'ioved therefrom.

.t tnrther objectoli the invention is' to provide means Vtor positively locking' the doorsl in closed position, and to also provide means cooiierating` therewith whereby the doors will be locked and held against opening mownnent under the right of the lading.;` should it happen thatI the doors were lait partially closed when theladinn' was placed thereon.

A farther objectof theinvention is to ,provide 'tor reducing to n minin'mi'n. the

frictionenclmntered by the doors during heir.movements: to open and closed positions.

t. still tnt-ther ohjeet ot' the invention `is to lprovide an operating mechanism for the doors or" dump cars wherein all danger oi' injury to the workmen operating the samt is eliminated, and in which the work rerednced to a minimum.7

The invention Jfurther contemplates the 'provision of novel door supporting means-so f ldisposed that the door or doors ride thereon in their opening and closingmovements, the

,.lsupporting means acting' as the pivot of the `[door or doors Vand guidingsame in their generally known as hopper lbottom cars pro- ',vided with doors (constituting either the bot Iton or a portion of the bottom of the car movement.

pear as the same is hereinafter described in detail and then claimed, and in describing;` the invention in detail7 reference will be had to the accompanying drawings showing a practical embodimentof the invention as practiced by me, and wherein like numerals of reference will be employed to designate like parts throng-hout the, several views, in which y Figure l is a top plan View of a hopper bottom car of standard form, partly 1)roken away, with my improved doors and operatinlg` mechanism applied thereto. Fig'. 2. .is a view of the same, partly in side elevation, partly broken away, and partly in section. Fig. 3 is a transverse vertical sectional view of the car body and doors, showing the latter in closed position. the ear body being partly broken away. Fig'. t is a similar View lshowingr the doors in the open position. Fie'. 5 is a longitudinal seetional view of a part ot' one ot the doors and of a part of the end walls of thecar body. Fig. 6 isa detached detail plan View of the tie rods employed in connection with the doors for uni'- yinpf the movements of the latter. Fig. 'l'

` is a detail side elevation ot locking dog cmployed in connection with the doors. taken on line 7-T otv Fig. l-l. a portion of the ear end wall being' shown. Fig. S is a detail view of a portion of one of the end plates locking dog'. Figs. t), l0 and l1 are detail edge, side and plan views ot theI lool-:ing dog'. Figs. 12 and 13 are detail plan and elevation views respectively of. the headed-pinwhich carries the locking-dog. Fig. 14 is a detail plan View ot the locking' mechanism, parts of the car being' in horizontal section. Fig.

t joint of the toggles, and, Fig. 1G is a detail l plan of one of the grooved rollers earned by g Further objects of the invention will` ap-` broken away to show the opposite side of thel 15 is an enlarged detail plan' view ot the `quired for the manipulation of thc doors is 'the doors, showing a portion of the track therefor, and a part,- of the door.

In the embodiment of the Vinvention as herein illustrated, I have shown the same as comprising two pairs of doors, that is, a pair of inner doors, and a pair of outer doors, in which form the invention would be used when applied to hopper bottom cars of standard form and size. but Ido not wish to be understood as confining myself tothe use of two pairs of doors, as obviously, a pair of doors arranged to operate in the manner herein set forth would be clearly within the scope of the invention. Furthermore, the doors being herein shown as applied to the standard form of hopper botltom car, they are arranged longitudinallyv thereof, inwvhich manner they are bestA adapted for use in connection with the said type of car. It is obvious that the arrangel ment the doors and the operating mechanism with the doorsI transversely of the car or other body as might be required to adapt them 4thereto also falls within the scope of the invention claimed.

The body of the car herein shown for illustrative purposes,vis in gene 'al, of the usual form, having vertical .side walls 15, and inclined end -walls 1G, which latter are usually placed at an incline to the vertical` of from 33 to 55. Attached to the inner faces of the side walls 15, are auxiliary side walls 17, whicl1,except at the point of attachment, are spaced from the side walls 15, and extend downward a sufiicient'distance to form, a recess 18 to receive the upper edges of the outer two doors of the series of doors, the walls 17 being made rigid by braces 19 attached thereto and to the side walls 15.

The center sills of the car body are designated at 2t), and these sills ar'c shown herein in,` the manner in which they are placed in the standard form of hopper cars, being spaced apart, and shielded or protected by a longitudinal ridge 21 usually formed lof two inclined plates having their upper meet-4 ing edges firmly secured ltogether. The lower portions 22 of these plates are ex tended vertically, and held in spaced relation 'from the sills by braces 23,1hus formv ing recesses 24 for the reception of the upper edges of the inner pair of doors shown.

To adapt the doors and operating mechanism to` be hereinafter described to the. form of hop er car shown, I rovidc the end Walls of sai carv with depen ing end-plates 25, which lie in Vertical planes, and since, with the form of doors employed, it is not. necessary to make any provision for a swinging movement thereof, the said endjilates are extended relatively close to the track,

land the doors are also placed so that their lower ed es are relatively close to the track.

' Preferably, I reinforce the lower edges of the end-plates by track-rails 26 of angle bar as' shown or other form. and cach end plate is provided adjacent its lower edge with elongated openings 27, the lower edges of which are preferably on a plane with the upper edges of the reinforcing bar 2G where by to provide a broader track for the wheels which travel in said openings and reinforce from interfering in any manner with the] free and easy movement of the doors. The doors may or may not be provided with the flanged upper and lower edges as shown, though it is preferable to provide the latter fianges to insure a perfect seating of the doors. v

The doors are disposed at such an angle with respect to thc car sides that the weight of the car lading will be directed against the doors so as to have a tendencyto hold them in closed position, the angle at which the doors are placed however, being such that the doors may be easily shifted to a more acute angle in order that the weight of the load will then be directed against the doors to effect a rapid movement thereof.

The doors at their ends, near the lower edges thereof, carry travelers, preferably in the form of peripherally grooved rollers` Si? which travel in the openings 27, on the track afforded by the lower walls ot' said openings and the upper edge ot the reinforce26. Preferably the doors` are provided on their under or rear faces in line with the rollers 32 with strengthening or rein forcing bars 3B, which may be of Zbar form as shown or other desirable form, which bars besides acting as a reinforce for the doors, also act as braces for the arms to which the toggles hereinafter described are connected.` llhe rollers 32 are carried on pintles formed on the outer ends ol straps 32 attached to the rear faces of the Z-bars 33 at the ends of the latter.

The doors nrc therefore roller-supportedy at their lower edgesA and in order to pr`ovide for the free and'easy movement of the doors both in the opening and closing movement thereof, I alsoprovide roller-Supporting means it'or the upper edges ot' the doors. rlhis latter door-supporting means comprises a plurality of rollers 34 supported beneath the recesses 18 for the outer pair of llt) doors, by brackets 35 attached to the car.

taehed to the center sills 2t). or at any other l ar` aoaptcd to engage witlt tlte upper tare eo'nvei'iient point'. 'the rollers are so positioned with respect to the recesses iS. 2t. as to leave cleat ance movement i'or the doors up into said recesses as the doors are moved to open position. 'l`he'doors may he made from a sheet ot material having' the ends and longitudinal edges stamped or pressed to form the angles at said ends and edg or tro "rfa sheet of material to which angle irt-ifrlinay he secured at said ends and edges as/ will he obvious. ln order to stit'l'en the doors tlii' tiglt itit and to' prevent any possibility o l the rollers ill, -lti bulging through `the doors. due to the weight ot' the lading;l on the doors7 l preteraht)r employ transverse 1 angle hars 2&5 extendingfrom the Z-hars 32% to the upper edges olt the doors, providing` theseantle-hars at each pointwhere there a roller BJ: or Btl and on which the rollers ride, thus reinforcing the doors transversely or in a'direction opposite to thereinforcing hars 33 and insuring against bulging` ot the doot-s where they ride on the rollers.

Where two pairsI ot' doors are operated from a single operating mechanism. the doors must all. move in unison, and to accomplish this. l employtie members as 23T, (see det-ait Fig. t3) which are provided preterahly at. hoth ends ot the doors, these tie members connecting' one door ot' the inner pair with the farthest removed door of the outer pair. and the other door of the inner pair with the door o t' the `outer pair farthest removed therefrom. (see Fig. These tie-members are advantageously attached yhy providingY extended pintles for. the rollers 32 to which pintles the tie-members are connected and retained thereon as h'v cotter pins 3o'. (sec Fig. d).

. The, means hy which the doors are secured or locked in closed position` and tht` means tor releasing); the doors will now hedeserihed.

Attached to the under or inner l'aee otl each inner door 'lo is an arm Btl. which projet-ts away Al'rom the. under t'aee ot the doors at'y right anglesthereto. these arms at their tree ends lining pivotally-attat-hed to toggle linlts l-t), Llst respectively and supported intermediate their ends hy the Z-hars lt.

vwill he seen h v the drawines. and will he unt'lerstood. that' these arms' I.) and toggle linlv's l-t). ll are providet't at eat-h end olL the doors. 'Ilz-e end oll the togglelinh lll is ieeeived within the hiinreated t-:id oi' the toggle-link all.. and said interengag'vd ends are received on a pin or holt Ali. having a head Lf. which rides in a vertical ginidevvvzvv ll-l provi/led therelor at the ends oll the doors. 'this guide-wav ll is torifietl liv attarhine to the end-plates 9.5. Z-hars -ll so spaced as to leavca wav hetwecn theml in which the pin t2 may ride as clearly seen in Fie'. l.. 'lfhe toggle arm Lt() is provided with shoulders Llti' at its pivoted end7 which oi'A the toggle artn l-t when the arms are. in a straight position, 'totjust slightly below the l center) and thus .lock the arms against Vfurther downward movement. These toggle-iinlis as ahove described, are adapted to lot-lt the doors in closed position, but. l have found hy experience, that sometimes an obstruction between the meeting edges 0i the doors prevents the complete closing ot the doors. and consequently the toggles are, not permitted 'o move to the straight line position. ll2 lading is placed in the car with the doors not completely closed, and the tottgles unlocked` the doors are liable ttnder the weight ot the ladino', and due to the jarring ot the car in transit, to move to open position. To positively insure against this` l have provided means in connection with the topjgh-s to automatically lock the. samefat the point, to which they have moved in their closing;- movement, whether this be in the completely closed position.y or a point approaching the closed position. To this end, I provide the head t3 ott' the pin or holt 4t2 with a stud ttl, located adjacent one side of the head l-l. and on which is pivotally hung, a locking-dog 4T whiclt lies within the way t, and haelt ot the head fl. is provided with a tooth #t8 which projects. t'rom the heavier edge of the dogy near the upper end thereof and engages with a rack itl provided therefor in the way tt, and whit-h may he in the form ot' a casting; and secured to the Z-har The dog` is also provided near its upper end` substantially in the saine plane with the tooth tS, with a. shoulder 4S located on the side of the dogl that lies adjacent. the head 4.3, and further provided on the same side, near the lower end oi the. dog;l with a shoulder 1-9, these two shoulders tH and Lttl respectively limitingy the downward and upward swinging movenient. ot the dog; hy their et'igragement. with the head hrtil. Since the dog' is heavier on that edge carryingr the tooth 48, and shouldei s' its and t). and since its upward sw'ine'- in;Y movement is limited hy the shoulder stt). it will he evident that. when pot subjected to pnl? ol'l the releaJsinev chain'Q/the doo' will normally lie so that the tooth thereof will he in engagement with the rae t 5t).

,The mechanism tot' releasing the lock and impartiti-.Ly initial opening' movement to the. doors connected to said dogs, so that when actuated. the poll oli the operating' chains is diverted tirst against the dogs toswing' thty sante on their Vlulerum or pivot and release :he tooth o.' eat-h doe` trom -theracks .3o. and du-n :uminstV the toggles at ther joint t.; hrealt said toggles and permit l doors to open.

in ordi i: that the doors may he operate-l from either side olf the "ar, I provide two operating shalts 5'l,the inner ends of which This locltii'ig dog.

are squared and extend t-lirough the center sills 20, into a drum 52 mounted between said sills and provided with a central shoulder 53 to divide the chains 54 running from the drum to opposite ends of the doors, where they are carried over guide-rollers 55, and have their other ends attached to the dogs 47. The chains 54 as will be noted are vattached to the drum 52 so as to run in op# posite directions and it will be obvious that a wrench applied to the outer end of either of the shafts 51 and the shaft rotated in either direction, will cause the chains to be wound upon the drum, swing the dogs on their pivots so as to diseiigage the tooth 48 of each dog from the racks 50 and pull upward upon the pins 42 so as to break the toggles and start the doors on their opening movement. In case the locking dogs are not employed, the chains are connected direct to the to'ggles at the joint ofthe latter.

As heretofore stated, the doors are so positioned that when an initial opening movenient has been imparted thereto, their angle is such that the weightofthe lading is directed against them to complete their openv ingmovem'ent. In this connection, I wish to Acall attention to the fact that, with the mechanism shown and described for imparting the initial movement to the doors, the chains.

51 are entirely free from pulling strain the moment that the weight of the lading in the car begins to act against the do,ors,thus permitting the chains to slacken or pile up as it were between the drum and point of' connection with the locking mechanism, and

consequent-ly imparting no movement to the shafts 51, so that all danger of injury to the operator using the crank or wrench on the shaft is obviated. The operating shafts are suitably protected from the hiding of the car by cross ridges 56- as shown, built in the usual manner so that. the material willV not bridge thereon. f

Attention isl directed to the manner in which the doors are wholly roller-supported, the rollers 34 acting as the pivotal points of the doors, and the latter moving over the'se pivots in their opening and closing movements, the upper edges of the doors following the `curved dotted lines 57, miniinizing and equalizing space at this point, while permitting a goed rigid construction. The provision of the rollers for supporting the doors both at the top and bottom thereof,

reduces the friction to a minimum and renincreasing their natural tendency` to move to closed position when the lading is discharged. In case the chains have not been wound to the limit on their drums, it will be noted that they will otl'er practically no resistance to the return ofthe doors to closed position, buteven though the chains be taut, the weight of the doors is such that they will readily move to closed position, readily nnwinding the chains and revolving `the` drums and shafts, the iesistance offered by such parts being practically m'Z after the doors begin closing.

The tying of the middle doors together by means of the pin 42 working in the way 44 provided by the Z-bars 45 tends to unify the action of the doors, the bars acting as a guide for the doors in their movement, and the outside doors being connected with the inner doors in the manner aforedescribed, positive simultaneous movement of the doors is assured.

While the toggles 40, 41 may be connected direct to the inner doors, I prefer to employ the arms 39 in connection with the toggles,

since by their employment, I am enabled to shorten the upward movement of the pivoted ends of the toggles, so as notto interfere with the center sills 20. These sills in the standard 'hopper cars are placed quite low down at the point most desirable to receive t the buliing strains and stresses on the car, and the use of the arms 39 enables ine to employ the toggle lock and such sills.

It will be observed by reference to Fig. 4 (see dotted lines 58",) that the lower edges of the doors have a slight movement downward caused by the rollers being placed some distance above the lower edges of the doors; obviously, when these rollers are placed close to the bottom edges of the doors, said edges will move in a substantially straight line, the upper edges of the doors however, always following the curve of the fixed pivot.

The feature of having the doors move to open position under the weight of the lading without the pull chains operating on the shaft or shafts is considered of importance, as it eliminates all danger to the operator, and enables the wrench or crank to be applied to the shaft and turned in either direction lengthwise of the car, when the car is locatedin xplaces where it may be diliicult for the nperator to safely operate devices which require continuous winding of an operating shaft to actuate the doors.

While I have herein shown and described the invention as embodying four doors, it will be obvious that a single pair of doors such as the inner pair herein shown and described iiiay be employed alone, and it will be obvious also, that changes in the details of construction may be made when adapting the invention to different types of dump cars, without in any manner V departing from the spirit and scope of the invention as herein disclosed.

- llai'ing 'fully described my invention'L",

" wliat ..l..claini isi l ried by the body at the ends of said diseee,

vcharge opening and provided adjacent their lower ends with tracks, doors forming the bottom of said car body and provided wlth wheels engaging said tracks and supporting the lower edges of said doors, rollers carv'i'ied by the car body for supporting the upper edges of said doors and over which roll- 'ers the doors ride in their openingand closing movements, and operating means con- Aio fn'ected" to the doors for imparting initial opening movement to the doors.

1n a dump car, a car body provided witlr a discharge opening, end plates carA ried by the car body at the ends ot said discharge opening and provided. adjacent their` lower ends with tracks, doors formingtlie `2O edges of said doors and over which the doors i ride in their opening and closing movebottoni of said car body and providedwitli wheels engaging saidv tracks and supporting the lower edges of the doors, rollers carried by the cai body for lsupporting the upper ments, operating means connected tothe doors for` imparting initial opening movement thereto, and a locking dog cooperating with the operating means to lock the doors guiding the lower edges ot the doors in a substantially horizontal plane, and rollers iiioi'ementf riding over said rollers.

for supporting the upper edges of the doors and over which the doors freely ride in their opening and closing movements.

4C. The combination of doors adapted to control a discharge opening,`ineans includ- 40' ing rollers tor guiding the lower edges of the doors in substantially a horizontal plane.

. additional rollers upon which the doors are supported a'nd over which-the 'doors ride in theiiuopening and closing movements, said, additional rollers acting as the pivots for the doors, and means foi imparting initial 4 opening movement to the doors. j 5, The combination with a car having an inclined bottoni, of a casing therein, a piv-,' oted door forming a portion ot said bottonnf rollers constituting the pivot. for said door, and means for raising the upper portion oi said door into said casing, said door in its t G. The coiiiliination with a car having an inclined bottom, ot casings therein, piroted ldoors forming a portion o'lfsaid bottom,

rollers constituting the pivots i'orgsaid doors Vand over which the doors rile in their open! 'nig and closing inovemeii a itl `doei 's int o ig the pivotal raising the upper portions said 'asings without n'u ,i

pointsl of the doors.

'f-Tlie-coinbination-et doorv adapted to control a discharge opening, tracks tor guiding the lower edges ot'- said doors in a sub` :andfnieans ttor im u i stantially horizontal plane, and rollers supi porting the upper edges ot said doors, said i rollers acting to guide the upperedges of raid doors in curved paths whilewthe lower edges ot the doors are traveling-in said substantially horizontal plane.

S. ln a dump car, aV car body provided said discharge opening, and disposed with .respect to the sid-e walls ot the car body as to have a normal tendency to move to closed position, toggle-links for securing said doors in closed position, and a locking-dog cooperating with saidtoggle links.

t). In -a dump ear, a car body provided with a discharge opening, doors controlling said opening. said doors so disposed with relation to the side walls of the car body as to have a normal tendency to move to `closed position lrwgravity, toggle links for securingrsaid doors in closed position, a locking-dog cooperating with said,toggle links, and`looroperatiiig meansyeomcted to said locking-dog.

l()A In a dump car, a car body/"provided with a discharge opening, doors ycontrkilling saidopening, said doors so disposed'ivith relation to the side walls ot the car body as to have a normal tendent-.y to move to closed position by gravity. operating mechanism for imparting initial opening movement to said doors, and locking mechanism for securing the doors againstl opening movement, including a locking dog connected with the door operating mechanism.

itin a dump Car, a car bodyr provided with a `discharge opening, doors controlling relation to the side walls of the car body as .tofhave a normal tendency to moveto closed position by gravity, operating mechH anism tor imparting Vinitial opening movement to said doors, means tor securing the doors in closed position, and means coperating therewith to lock the doors against opening movement as they approach the closed. position.

1Q. ln a dump car, a '.ar body provided with a discharge opening, doors for controlling said opening` and so disposed with relation to tlnl side walls ot theI car ,body as to have a normal tendency to inofie to closed position. toggle links secured the doors and acting to hold said doors iii closed position. operating meansl for open- 'ing the toggles and iniparting initial opening movement to the doors, and means cooperating with the toggles t'o hold the doors against opening movement as the \v approach the closed position.

15%; ln a dump ear, aY car bod)Y provided saidzopenii'ig, said doors so disposedas Yto have a normal teiulencv to move to closed l .f

lposition by gravity, operating means conwith a' discharge opeiiing,doors controlling said opening, said doors so disposed with vwith a Ydischarge opening, doors controlling nected to said doors to impart an initial opening movement thereto, and means cooperating therewith to hold 'the doors against opening movement they approach the closed position.

14. In combination withv a car body hav- I ing a discharge opening, and doors conoperating locking-dog acting to hold the doors against opening movement as they approach closed position.

l5. In combination with a dump car having a discharge opening, ,a pair of doors controlling said opening and so disposed as to have a normal tendency to move to closed position by gravity, tog le links connected to said doors, a pivote locking-dog connected to said toggle links, and door o erating means connected to said locking-t og.

l16. The combination with a car body having a bottom" dischargelopening, of doors adapted to control said opening and disposed with respect to the walls of the car od as'to have anormal tendency to move vto closed position by gravity, tracks tor guiding the lower edges of said doors in a substantially horizontal plane, means for supporting the upper ed es of said doors, said means acting to gui e the upper edges of said doors in curved paths while the lower edges of the doors are traveling inA said substantially horizontal plane.

17. In combination with a dump car having a bottom discharge opening, end plates 'carried by the car body at'the ends ot' said discharge opening, a pair of doors controlling said discharge' opening and so disposed as to have a normal tendency to move to closediposition by gravity, tracks carried by the end plates, rollers carried by the doors and travelingon said tracks for supporting the lower edges of said doors,

'rollers carried by the` car for supporting the upper edges of the doors and over which the doors ride in their opening and closing movements, toggle links connecting the doors and acting to secure vthe doors in closed position, headed pins to which the toggle links are connected, and guides carried by the end tvplates -in which the heads of said pins ride during the movement of the doors.

18. In combination in a dump car, a car body having a bot-tom discharge opening, end plates carried by the car body at vthe ends of said discharge opening,l dnors for controlling said discharge opening, "tracks arranged to support and guide the l Wer edges of said doors during their opening and closlng movements, toggle-links connecting said doors, headed pins to which said togglelinks are connected, and guides carried by the end plates in which the heads of said pins engage and in which said heads travel during the opening and closing movements of the doors.

lil. ln combination in a dump car, a 4car body having a discharge opening, end lates carried by the car body at the ends o said opening and provided with tracks, doors for controlling said opening having rollers engaging said tracks, rollers for supporting which said doors ride in their opening and closing movements, toggle-links connected to the doors for securing them in closed position, pins connecting the toggle-links together, and guides carried by the end plates in which said pins engage and ride during the opening and closing -movements of' the doors.

20. In combination ina dump car, a car body having a discharge opening beneath the center sills of the car, doors for controlling said opening and so disposed with relation to the side walls of the car as to have a normal tendency to movel to closed position by gravity, means for supporting the lower ling said opening, means for supporting the lower edges of said doors and guiding them in a substantially horizontal plane durinv their opening and closing movements, an

for supporting' the .upper edges of said doors and over which rollers the doors ride in their opening and closing movements.

22. In combination in a dump car, a car body, having a bottom discharge opening,

end plates carried by the ear body at the ends of said discharge opening, doors for controlling said opening, tracks for su porting-and guiding the lower edges oiJ said doors during the opening and closing movements' thereof, toggle-links pivoted together and connecting said doors for securing the doors in closed posit-ion, vertically-disposed guides on the end plates at the ends of the doors, and means at the ends of the doors engaging-in said guides to insure uniform travel of the doors in their opening and closing movements.

23. In combination in a dump car, a car body having a discharge opening, end plates carried by the cardeody at the ends the upper edges of the car doors and over rollers carried by the center sills of the car of said discharge opening, doors for control'-i edges of said doors and guiding them in a l the center sills of the ear, doors for controllling said opei'iing vandsofdis osed with relation tothe car body vas'to ave a normal tendency to move to closed sitionby gravity, tracks'for supporting vvandy guiding the lower edges ofsaid doors during the opening and closing' movements thereof, togglelinks pigote'd together and connected to said doors'A yfr'sfeeurig the doors in closed posi- 'tiol i,' and ,'gwuides on the end plates co-aeting suring'gniform `travelof-the doors in their openingand closing movements.

. 24. In combination in a dump car, areal' bodybaving a discharge opening, end lates carried by the car body at the ends o said i discharge opening, doors for controlling said opening so disposed with relation to the side walls of the car body; asto have a normal I` tendency to move to'closed position, tracks for supporting and guiding the lower edges of said doors during the opehing and clos- -end plates receiving said ing' movements thereof, toggle-links connecti ed to said "doors, a pin to which said links are pivoted, vertical guides on one of the dog carried by said pin.

H25. -In a dump car, a car body, and a plu rality of doors forming the bottom of said pin, and a locking 25 body, said doors arranged in pairs and shift- PATRICK JOSEPH HARRIGAN. Witnesses l PETER LANGSDORF, n JOHN LANGsnoRF.

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