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Publication numberUS3137247 A
Publication typeGrant
Publication dateJun 16, 1964
Filing dateAug 4, 1961
Priority dateAug 4, 1961
Publication numberUS 3137247 A, US 3137247A, US-A-3137247, US3137247 A, US3137247A
InventorsHamilton Samuel C, Howard Lagerveld Sebastian
Original AssigneeMagor Car Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Operating mechanism for doors on hopper type cars
US 3137247 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

J1me 1964 s. c. HAMILTON ETAL 3,137,247






INVENTORS SAMUEL C. HAMILTON S). HOWARD LAGERVE LD 3,137,247 @PERATING MECHANESM FOR DQORS N HQPPER TYPE CARS Samuel C. Hamilton, Clifton, and Sebastian Howard Lagerveld, Wayne, N.J., assignors to Magor Car Corporation, Clifton, N.J., a corporation of Delaware Filed Aug. 4, 1961, Ser. No. 129,408 1 Claim. (Cl. 105-251) This invention relates to an improvement in hopper car type outlets having doors adapted to be readily and easily manipulated and capable of being forcefully set in closed position to provide a completely escape-tight seal.

In many cases, cars of the hopper type class are dispatched in one direction with a dry bulk cargo, and if they cannot pick up a similar cargo on the return trip, the latter produces no revenue. It also happens in some cases that, where dry bulk is shipped in one direction, the cars could pick up bulk fluid material, such as molasses or the like, thereby making the return trip carry a payload.

Accordingly, the primary object of the invention is to provide a new type of car intended to have a single hopper having outlets completely adaptable to either dry or liquid cargo. That is to say, the present invention provides discharge outlets which will achieve many advantageous results in the handling of bulk materials and foodstuffs in either dry or liquid form, the said outlets being disposed longitudinally in a manner that a maximum of lading may be carried, because there are no intervening latitudinal hoppers or slope sheets. Moreover, the absence of a plurality of hoppers also reduces the cost of manufacture and eliminates extra material.

Another object of the invention is to provide outlets which empty the lading between the rails rather than over or across them, as do some other type outlets. *In connection with the emptying or discharging operation, flow may be adjusted to any rate desired, and will hold this given adjustment without further attention.

Another objectof the invention is to provide elongated rectangular doors with high pressure operating mechanism so that the resilient gasketing material between the doors and framesQ as well as the novel means for distributing the pressure evenly to all sides of the doors,

.makes; it possible to carry ladings of finely powdered material or even viscous liquids, which heretofore have required entirely different types of cars of special zed construction for proper handling.

A still further object of the inventionis to provide a mechanism arranged so thatthe doors may be operated from either side of the car as well as controlled from the same side. This operating mechanism may be actuated by hand, or a power driven wrench may be used to effect opening or closing.

United States Patent A still further object of the invention is to provide a more fully described, illustrated, and claimed.

3,137,247 Patented June 16, 1964 A preferred and practical embodiment of the invention is shown in the accompanying drawings, in which:

FIGURE 1 is a side elevation of the new hopper type car construction.

FIGURE 2 is an end elevation of the car shown in FIGURE 1, and including the present improvements.

FIGURE 3 is an enlarged transverse sectional view of the doors and the operating mechanism.

FIGURE 4 is a fragmentary view illustrating one of the new doors.

FIGURE 5 is a somewhat schematic view which, when combined with FIGURE 4, illustrates the operating means for the door.

FIGURE 6 is a diagrammatic view illustrating the doors in normal closed condition and emphasizing equal clearance for the cranks at either side of the operating shaft.

FIGURE 7 is a view similar to FIGURE 6, illustrating a condition where one of the turnbuckles has been adjusted to greater length than the other turnbuckle, and showing that the crank has shifted to equalize the force on opposite doors.

FIGURE 8 is a detail elevation of the operating shaft and crank, showing the opening in which the shaft may slide.

FIGURE 9 is a diagrammatic view illustrating the over-center lock feature.

Similar reference characters designate corresponding parts throughout the several figures of the drawings.

As will be observed from FIGURES 1 and 3, the hopper type car is designated generally as A and is provided medially between the trucks with the side sheets B, inclined downwardly and inwardly, to cooperate with the pyramidal center sill hood C to provide opposite laterally disposed ladingpockets communicating with the doors D. These doors are preferably of rectangular formation to fit into corresponding openings D to selectively close and open to receive and discharge the lading.

In order to insure fluid tightness between the doors D and their frames D suitable gasket means G may be employed, and, as will be further observed from FIG- URES l and 3, each door preferably has a pair of hinge arms 1 supported on hinge pivots 2, the said arms 1 being controlled by actuating elements E.

Preferably, the elements E include outer links 3 pivotally connected as at 4 with the outer surface of the related door and the inner link 5, the said links 3 and 5 being connected by suitable turnbuckles 6. The inner ends of the links 5 are pivotally connected at 7 to related arm portions of crank members 8. Each crank 8 is mounted on shaft 9, supported by the strap 10 of substantially V-shaped formation and whose upper ends are appropriately secured adjacent the center sill S of the car.

In order to prevent overthrow movement of the cranks 8 from their normal locked position, a suitable abutment 11 (FIGURE 3) projects downwardly from the center sill assembly so that its lower. edge will abut with the crank, as also shown in FIGURE 3.

The drive shaft 9 for the links carries at one end thereof a worm gear 12., mounted in a housing 13 and intended to mesh with a worm 14.

As will be additionally observed from FIGURE 3, the worm 14 is coaxially carried on a stub shaft 15, disposed in journals 16. The ends of these journals are provided with thrust couplings 17, intended to receive the key end of a related operating shaft 18 directed to the outer side of the car. This operating shaft in turn cooperates with a shear coupling 19, which houses an actuating wrench head 20.

It will now be seen how the worm 14, which controls the cranks 8, may be operated from either side of the car by applying a suitable hand or power wrench to the key portion of the wrench head.

The cranks 8, as will be' more particularly observed fromFIGURES 6-9, inclusive, are provided with elongatedslots 8 which receive the flattened section 9* of the actuating shaft 9 FIGURE 6 illustrates the normal condition of the parts, wherein the crank 8 is centered on the shaft 9 and can have an equal degree of movement to either side of the center as indicated by the diagrammatic lines.

FIGURE 7 illustrates a situation where unequal clearance may exist between the cranks 8 and the shaft 9 as, for example, when one of the turnbuckles 6 has not been adjusted to the same degree as its related buckle. In this situation, the unequal clearance will be apparent from the diagrammatic illustration of FIGURE 7. While, the righthand turnbuckle has been adjusted to greater length than the lefthand turnbuckle, the crank lever 8 has shifted to equalize the force on the doors.

FIGURE 8 is an enlarged detail view of one of the cranks and its slot, which receives the flattened portion 9 of the actuating shaft 9.

FIGURE 9 illustrates the over-center lock, which takes advantage of the load pressure to maintain tight sealing engagement between the doors and the door frames. That is to say, it will be seen from this figure that, as crank 8 is rotated from open position X shown in dashed lines in a clockwise direction toward the closed position Y, the force caused by the door Weight, resilient gaskets, and later the weight of the lading, as represented by the arrows Z-Z, passes from a position which would cause counterclockwise rotation of the crank through dead center (center of rotation) to the over-center position shown. In this'position, the forces ZZ are now applied to rotate the cranks in a clockwise direction. Further rotation is resisted by the abutment or stop 11 on the car frame.

In this position, the doors are securely locked, and additional load on the doors will result only in an increase in the locking force.

Moreover, augmented locking force results from the geometry of the gear 12 and the worm 14in the gear box 13, because the worm can rotate the gear, but the gear cannot rotate the worm. Therefore, in the event that the cranks do not go over-center, opening of the doors is still prevented by the worm.

Description of Operation Assuming that the doors are closed, and it is desired to'open the same:

When power is applied to either end 20 of the shaft 18 by means of a power wrench or hand crank, rotational motion is transmitted through a suitable bearing andthe shear coupling 19 to the gear box drive 12-14. After the worm gear 14 turns the gear 12, which is connected to drive shaft 9 and cranks 8, the turnbuckles 6 pull the links 3 and to move the doors from the doorway. The door position relativeto the-door frame may be closely regulated to control the flow or passage of lading from a fine trickle'to a full flow.

Assuming-now that the doors are to be closed, it will 7 be understood that the opening process is reversed and the cranks 8 are pushed back until they and the turnbuckles 6 are in line. The cranks continue slightly past this point, and are then resisted by the related adjustable stop 11 on the car structure. Since the cranks and turnbuckles are overcenter, they are self-locking. Furthermore, it is' pointed out that the force from the turnbuckle 6 is applied to the pivot pin 4, which connects the 3 With the door, hingedly supported as indicated improper adjustments.

4 V at 2. This feature allows the closing force to be evenly distributed around the periphery of the door so that high sealing pressure developed by the linkage going over the center is evenly applied to the gasket material.

An additional feature of the linkage is the manner in which the cranks are attached to the shaft 9.

As previously indicated, each crank 8 has the elongated slot th to receive the non-circular cross section 9 of the shaft 9 in order to turn the cranks, but, the said slot 8 is of greater length than the non-circular portion of the shaft 9. Thus, even though the turnbuckles are misadjusted, the entire crank and turnbuckle assembly may shift in a lateral direction so that, as previously indicated, the resulting forces on the doors are equal. Again, with this arrangement, the pivotal connection to the doors D and the compensating means on the shaft 9 will insure equal force on each door and uniform pressure on the mating surface of the door and frame. At the same time, this arrangement will eliminate undesirable side thrust on the mechanism which would be caused by Although the drawings show the door pivotally connected to the hinge, the reverse of this could be true, namely that the hinge could be fastened to the door andsutficient clearance provided on parts of the hinge to allow the door to adjust itself to the frame. In either case, the hinge supports only'the door weight, but does not restrict its movement as would be the case if a fixed pivot were employed.

We claim:

A freight car of the hopper type mounted on wheeled trucks for travelling over railway rails and adapted for the transportation of bulk or fluid lading, said car having a frame, side walls and end walls and being of greater length than width and including a center sill extending longitudinally thereof, and a hood above said sill,

(a) means forming opposite longitudinally aligned I hopper openings medially of the bottom of the car to discharge lading between said rails,

(b) gasket means mounted on the means forming said openings and surrounding said openings,

(c) doors pivotally mounted on the car frame adjacent said hopper openings for opening and closing sealing engagement with'said openings and gasket means,

(d) a pair of hinge arms each pivotally connected at one end to said car frame above the hopper openings and pivotally-connected at its other end to each of said doors, I

(e) a pair of spaced crank members for selectively operating opposite doors in unison from either side of the car, said crank members having aligned openings at opposite ends thereof and a slot disposed intermediate said openings and having its longitudinal axis parallel to but offset from the plane of said openings, said slot forming the pivot point for said crank members,

( f) adjustable link means pivotally connecting opposite ends of the crank members with a related door at the same pivot point at which said hinge arms are connected to said doors,

(g) stop means on the car frame for engagement with said crank members to prevent overthrow thereof from their normal locked position,

(h) a crank shaft secured to the car frame beneath the center sill and. having a pair of flat portions operating in the slots of said cranks, the width of said slots being greater than the width of the flat portions of said shaft to provide balancing of the forces acting on the door surfaces,

(i) a worm gear secured to the crank shaft, a worm in constant engagement with said worm gear, and operating shafts extending laterally from said worm to opposite sides of the car, f

(j) whereby upon rotation of said operating shafts to move the doors to closed position, said crank members and the adjustable link means connected thereforce exerted by the Weight of the lading when the 7 car is loaded on the doors around the periphery of said doors to form a fluid tight seal with the gasket means surrounding the hopper openings.

References Cited in the file of this patent UNITED STATES PATENTS 672,076 Cowell Apr. 16, 1901 693,132 Heiden Feb. 11, 1902 731,525 Trapp June 23, 1903 743,504 Hart Nov. 10, 1903 6 Johnson Dec. 8, 1903 Lindstrom May 5, 1908 Neikirk May 3, 1910 Probes Feb. 14, 1911 Clark Apr. 20, 1915 Lindstrom Oct. 5, 1915 Weaver Feb. 25, 1919 Iunghanns Mar. 18, 1919 Test Feb. 15, 1921 Hart Feb. 5, 1924 Campbell Nov. 18, 1924 Zimmer June 24, 1930 Andres July 29, 1930 McDonald Mar. 31, 1931

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US672076 *Apr 24, 1900Apr 16, 1901Ernest W EwellDumping-car.
US693132 *Dec 3, 1900Feb 11, 1902Axel HeidenCar.
US731525 *Oct 1, 1902Jun 23, 1903Edward A TrappTransportation-car.
US743504 *Aug 15, 1902Nov 10, 1903Eli S HartDumping-car.
US746519 *Oct 28, 1903Dec 8, 1903Sinclair J JohnsonDumping-car.
US886380 *Jun 13, 1907May 5, 1908Charles A LindstroemCar-door-operating mechanism.
US956819 *Oct 21, 1909May 3, 1910Nat Dump Car CoDump-car.
US984105 *Feb 14, 1911Charles K ProbesHopper car and wagon.
US1136317 *Apr 3, 1911Apr 20, 1915Clark Car CompanyDump-car doors.
US1155938 *Mar 22, 1910Oct 5, 1915Charles A LindstroemCar-door gear.
US1295246 *Feb 16, 1918Feb 25, 1919Ralston Steel Car CoHopper-bottom car.
US1297356 *Aug 19, 1918Mar 18, 1919Ernest JunghannsDump-car.
US1368372 *Jun 10, 1919Feb 15, 1921Test Ellis WDump-car
US1482559 *Aug 4, 1921Feb 5, 1924Hart Harry SHopper car
US1515834 *Feb 16, 1923Nov 18, 1924Entpr Railway Equipment CoDoor-operating mechanism
US1765519 *Nov 9, 1927Jun 24, 1930Entpr Railway Equipment CoCenter-discharge ore car
US1771832 *Oct 15, 1928Jul 29, 1930Bendix Brake CoBrake-operating mechanism
US1798549 *Oct 6, 1928Mar 31, 1931Bendix Brake CoBrake-operating mechanism
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3316858 *Oct 24, 1962May 2, 1967Union Tank Car CoRailway hopper car closure actuating device
US3343725 *Jun 9, 1965Sep 26, 1967Hoover Ball & Bearing CoBottom discharge bin
US3401645 *Sep 1, 1966Sep 17, 1968Midland Ross CorpRailway hopper car door sealing assembly
US3405655 *Nov 22, 1966Oct 15, 1968Continental Transp AppliancesRailway hopper car door operating mechanism lock
US3447485 *Jan 9, 1967Jun 3, 1969Continental Transport AppliancHopper car door actuating mechanism
US3455253 *Jan 12, 1967Jul 15, 1969Midland Ross CorpMultiple hopper door actuating mechanism
US3596608 *Nov 20, 1968Aug 3, 1971Pullman IncHopper door actuating mechanism
US3596609 *Aug 13, 1969Aug 3, 1971Ortner Freight Car CoRapid discharge hopper car door actuator
US3611947 *Jun 23, 1969Oct 12, 1971Pullman IncToggle hopper door operating mechanisms
US3805708 *May 19, 1972Apr 23, 1974Pullman IncRailway car hopper door operating mechanism
US4508037 *May 24, 1982Apr 2, 1985Pullman Standard, Inc.Door lever adjusting device for hopper car doors
US4606276 *Apr 22, 1985Aug 19, 1986Miner Enterprises, Inc.Motion retarder
US4741274 *Mar 27, 1986May 3, 1988Trinity IndustriesHopper door operating mechanism
US6955127 *Feb 2, 2004Oct 18, 2005Taylor Fred JManual railroad hopper car door actuating mechanism
US7210413Oct 7, 2004May 1, 2007Trn Business TrustUniversal boxcar
US7261044Aug 4, 2005Aug 28, 2007Trinity Industries, Inc.Boxcar with load restraint system
US7305923Oct 7, 2004Dec 11, 2007Trinity Industries, Inc.Universal boxcar with exterior metal surfaces
US7681507May 4, 2006Mar 23, 2010Trn Business TrustRailcar with discharge control system
US7703397Sep 8, 2006Apr 27, 2010National Steel Car LimitedRail road hopper car fittings and method of operation
US7735426Oct 17, 2006Jun 15, 2010Trinity Industries, Inc.Hopper cars with one or more discharge control systems
US7891304Jun 12, 2008Feb 22, 2011Trinity Industries, Inc.Railcar with discharge control system
US8047140Aug 11, 2010Nov 1, 2011National Steel Car LimitedRail road hopper car structure
US8065964Feb 2, 2010Nov 29, 2011National Steel Car LimitedRail road hopper car ridge fittings
US8596203May 11, 2011Dec 3, 2013National Steel Car LimitedRailroad car and door mechanism therefor
US8622004Oct 31, 2011Jan 7, 2014National Steel Car LimitedRail road hopper car ridge fittings
US8915193Mar 15, 2013Dec 23, 2014National Steel Car LimitedRailroad car and door mechanism therefor
US8915194Jun 15, 2010Dec 23, 2014Trinity Industries, Inc.Hopper cars with one or more discharge control systems
US8967053Jun 28, 2013Mar 3, 2015National Steel Car LimitedRailroad hopper car and door mechanism therefor
US20040149163 *Feb 2, 2004Aug 5, 2004Taylor Fred J.Manual railroad hopper car door actuating mechanism
US20050087096 *Oct 7, 2004Apr 28, 2005Creighton George S.Universal boxcar with exterior metal surfaces
US20050268815 *Aug 4, 2005Dec 8, 2005Trn Business TrustBoxcar with load restraint system
US20060032396 *Jul 15, 2005Feb 16, 2006Trn Business TrustSafety latch lock indicator for railcar door operation mechanism
U.S. Classification105/251, 105/296, 105/299, 188/204.00R, 105/307, 105/284, 105/255
International ClassificationB61D7/26, B61D7/00
Cooperative ClassificationB61D7/26
European ClassificationB61D7/26