US1908674A - Mine car - Google Patents

Description

May 9, 1933.

H. H. HUDSON MINE GAR Filed March 31, 1931 5 Sheets-Sheet 1 V o M5 A o B r i i o f N 0 M2 y 9, 1933. H. H. HUDSON 1,908,674

MINE CAR Filed March 31, 1931 5 Sheets-Sheet 3 y 9, 1933 H. H. HUDSON 1,908,674

MINE (EAR- Filed March 31, 1931 5 Sheets-Sheet 4 H; H. HUDSON May 9, 1933.

MINE CAR Jvwmtoo Patented May 9, 1933 UNITED: STATES PATENT OFFICE HENRY H. H UDSON, OF DTOZVILLE TENNESSEE, ASSIGNOR TO HUGH w. BA ITFOBD, OF

' KNOXVILLE, TENNESSEE KINEGAB Application fled larch 31, 1981. Serial No. 528,8?1.

This invention relates to-an improvement in drop bottom mine cars.

The principal object of the invention is to provide a drop-bottom central discharge mine car of a very large capacity with a low height and a wider top to the car than has heretofore been possible for cars of this type when of limited height. The car is of the drop bottom design, where it is necessary to have a rather steep slope to the stationary flaring side walls in order that the coal may shed into the central opening. For use in coal mines the plane of the sloping side wall is at an angle of approximately 35 or 40 degrees from the horizontal and in this car the plane of the side wall when thus sloped intersects the top edge of the wheel at a point outside of'the track-gauge line at the base of the wheel flange at the topof the wheel.

The car is provided with side sills 051 the outside of track-gauge-line in order'to dispose the wheel bearings or boxin outside of the track-gauge line, w 'ch construction permits of the supportin of the flared side walls at lower points, t us pro- .viding a-wider top car with relatively low 30 'with the side sllls. With this construction height, and thus increasin the capacity of the car when the over-all height of the car is limited. The bumpers-extend outward beyond the trackuge line and are connected it is possible to eliminate the inside sills.

This. construction not only permits the I flare of theca'r to start at a lower point but also permits-slabs widening of the bottom doors, all of which cooperate inobtaining additional 'car capacity fofia certain limited rails of the mine track.

over-all height and'width.- Alsothe wider discharge opening .in the'bottom is an advantage in that 1t permits of the handling of larger-sizes of la material for certain track-gauges. With 'is' construction, the

width of door opening can be made the maximum possible when single piece drop doors are used which fall between-the In the accompanyingdra I Fig. 1- is a side elevation a complete car, illustrating an application of the invention thereto;

on the.

base of the Fig. 2 is an enlarged side elevation of, an end portion of the car;

Fig. 3 is a partial transverse sectional view therethrough on the line 3 3 of Fig. 2;

Fig. 4 is a bottom plan view of an end por- I tion of the car;

Fig. 5 is a side elevation of an end portion of the car showing amodification in the side. sills and tie nfember;

Fig. 6 is a partial transverse sectional view therethrough on the line 66 of Fig. 5;

Fi 7 is a partial sectional view on the line 7 of Fig. 8;

Fig. 8 is a side elevation of an end tion of the car showing a further m tion in the side sills and tie members;

Fig. 9 is a similar view of still another modification;

Fig. 10 is a partial sectionaljviewthere through on the line 10-10 of Fig. 9;

. Fi 11 is *a transverse upri ht section on th hne 11-.11' of Fig. 2 but ow' modifications in the side 81118 and car si es; and

Fig. 12 is a detail sectional view on the lin 12-12 of Fig. 3.

Referring to the drawings, A, A are track rails. The wheels of the car are d ated B, B and are rovided with-hubs 1, ap-

plied to axles .C. The wheels are rotatably mounted on the axles C or, if desired and as is oftenprovided in mine cars, the axles may rotate with the wheels. 1

In the form of the invention shown in Figs. 1 to 4, theupper art of the car body F may be constructed 0 sheet metal .andhas extended side walls F1, are provided with flared portions F2 terminating at their lower edges in w' F3,'which extend downward tn the inside of the wheels B and are notched as at F 4 to slip overthe hubs B1. The flared portions F2 have hoods F5 over the tops of the wheels B. The slope a horizontal plane, and the plane of this flared portion F2 intersects the top of the wheel approximately at its outer edge, or

outside of the track-gauge line at the base of the wheel flange at the top of the wheel. These flared portions F2 are thus lowered to increase the capacity of the car and the car provided with a wider top but is relatively low in height. The inside end of the hood F5 is approximately in the same vertical plane asthe wing F3 and forms a continuation thereof.

Tie bars G extend upward on the outer sides of the side walls and effectively brace the same. These tie bars G extend approximately from the top edge of the side walls F l to the bottom edge of the wings F3 in the form shown in Figs. 1 to 4, and are riveted thereto as at G1.

The side sills are shown at H, and it will be noted that these sills are disposed on the outer sides of the wheels B and are therefore on the outside of the track-gauge line. In the form shown in Figs. 1 to 4, these side sills H are in the form of plate members, each having an upper outturned flange H1 rivet-ed as at H2 to the tie bars G and the flared portions F2 of the side walls. A lower outturne'd flange H2 is formed on each of the side sillsH and extends approximately horizontally. A bracket I is arranged between the side sills H and each of the tie bars G, being rigidly secured thereto as by riveting, in,order to brace the intermediate portion of each of the side sills H and the flared sides F2.

Bearing boxings J are disposed beneath the flan e H2 of each side sill H and each of said boxings has arms J1 extending in opposite directions, by which said bearing boxing is fixed tothe flange H2 as by bolts J2. The boxing J receives the outer "end of the axle C and'supports'the body structure thereon. I

Dust collars K are disposed within the wings F3 and surround and enclose portions of the axles C and hubs B1 on the wheels B. The outer ends of the side sills H have a combined bumper and end sill L, secured thereto by corner brackets L1. The bumper and end sill structure L extends outward beyond the track-gau e line and is connected with the side sills H at points outside the gauge line. The bumper structure L is not connected with the wings F3 of the side walls other than through the side. sills H and are not supported directly by the bumper and'end sill structure. The load is thus supported from points outside the track gauge line. i

In drop bottom cars of the type shown, one or more ofany practical drop door construction may be used. These are, ,so far as is known, patented constructions. Also one or more drop doors maybe used. The construction shown has a single drop door M the side edges of which extend to within five inches of the upright planes of the adjacent track gauge lines and are braced by angles M4 at its edges, which door is covered by U. S. Patent to Sanford, No. 1,512,059, of October 21$ 1924, and which is hinged as at M1 at one end of the car (see Fig. 1 and has abracket M2 attached to the opposite end in position to be engaged by preferably two bell-crank levers M3, which are mounted at the rear end of the car and normally support the free end of the door M but are adapted to release the door when operated by suitable cams, which may be placed opposite the track to be engaged by the arms of the bell-crank levers in a manner heretofore well known in the use of drop bottom cars of this type. The

Griflith multipledrop door construction, as

covered by U. S. Patent No. 1,268,344, could also be used with this general car c'onstruc tion.

In the form shown in Figs. 5 and 6, the structure is the same as that above described,

except that the side sills N are constructed of conventional structural channel-iron instead of as a plate H, shown in Figs. 1 to 4.

In Figs. 7 and 8, the side sills H are shown with the top flange H1 secured to the flared portion F2 of the sides of the car body, while the lower out-turned flange H2 of theside sill is free. The boxing 0 having a peripheral flange 01 by which this boxing O is secured to the inner face of the side sill H, as

shown particularly in Fig. 7. Bolts 02 are employed to secure the boxing in place.

In this form of the invention, gussets P are employed in lieu of-the tie bars G to (brace the side walls of the car'body, and which gussets P are arranged between the flared portion F2 and the outer sides of the side sills H. In this form, brackets P1 are also employed between the outer sides of the wings F3 and the inner sides of theside sills.

also employed between the wings F3 and the ,inner sides of the side sills N. I

- In all of these forms, the end bumper structure L extends to and is connected with the side sills outside ofthe track-gauge line. This disposition of the sidesills and bearing boxings outside of the trackgauge line and therefore outside of the. wheels permits the flared portions of the side walls to be lowered to substantially increase the capacimesa-r4 jacked up to permit the removal of the wheels.

If desired, the lower part of the boxings could be made open so that the truck, as a whole, could be removed from the car without disturbing any bolts or without disturbing the side sill member, but merel upon jacking the car up high enou h so t at the top of the wheel flange woul pass beneath the. boxings, as then attached to the side sill members. v

The reference in the claims to standard track rails or the equivalent is intended to refer to the rails of the track which runs throughout the workings where the car is used. The reference in the claims to working clearance between the wheels and the bottom wings, F3, is intended to referto only 'sufiicient room to permit free rotation of the wheels and not a-substantial distance there--.'

between as has been used heretofore. Or; dinaril the wheel hubs would project throug these bottom wings, F3.

I claim: I

1. In a four-wheel drop-bottom coal mining-or similar rail car with a lading body having a central portionand side wing-portions, and with stationary ladin bottoms to the side wing-portions, which ttoms are sloped for the discharge of the lading through openings made by the dropping of the bottom doors and for discharge between track rails, the. combination of car wheels projecting into the said side wing-portions of the lading 'body, and deeply recessed wheel hood-coverings over the tops of the wheels, the said hood-coverings being slo d so as not to prevent the discharge of the Iii?!- ing through the droIpped bottom doors, and the inside walls of t e wheel hood-coverings being disposed ap roximatel in the vertical planes 0 the s1 e edges 0 the discharge openings. 7 I

2. In a four-wheel drop-bottom coal mining or similar rail car with alading body having a central portion and side wing-pop tions, and with stationary lad' bottoms to the side wingiportions, which ttoms are sloped for, t e discha of the ladin through openings made y the dro ping o the,bottom doors and for complete ischarge between standard track rails, the combination of car wheels projecting into the said side-wing portions of the'lading body, and

. deeply the. wheel hood-cover over 'the tops of the wheels, the said h -coverings being sloped so as not to prevent the tially tions, and with stationary ladi 'bottom doors, together with stifi en discharge of the lading through the dropped bottom doors, and the inside. walls of the wheel hood-coverings extending substanto the upright plane of the adjacent outside edges of t e drop doors.

33. In a our-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-portions, and with stationary lading bottoms to the side win -portions, which bottoms are sloped for t e discharge of the lading through openings made by the 'drop ing of the bottom doors and for discharge tween track rails, the combination of car wheels projecting into recesses in the side wingportions so that the upper wheel flanges as disclosed in the vertical cross-sections of the wheels are bhried within the said recesses, and wheel hoods covering thetops of the wheels and havin the inside walls thereof disposed approximately in the vertical planes of the side edges of the discharge openings. 0

4. In a four-wheel dro -bott0m coal mining or similar car with a ading body having a central portion and side wing-portions, and with stationary lading bottoms to the side wing-portions, which bottoms are sloped for the discharge of the lading through openings made b the dropping of the bottom doors and or complete ischarge between the track rails, thecombination of car wheels projecting into recesses in the side wing-portions so that the upper wheel flanges as disclosed in the vertical cross-sec- .walls of the said hoods extending substantially to the upri ht plane of the adjacent outside edges of e drop doors.

5. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-pop bottoms to the side wmgportions, which ttoms are sloped for e discharge of the lading through openings made by the dro ping of the bottom doors and for complete 'scharge between standard track rails, the combinatron of car wheels p 'ecting into the said side wing-portions, oft lading body, and deeply burr-.4 wheel hood-coverin over the tops of the wheels, the said ,h coverln'gs bemg sloped so as not to prevent the discharge of the lading through the dro ped d wise body supporting members outside eels, and ax e spindles associated with lad' the i vi thesaidendwise members and supporting them.

6. In a foli'r-wheel dro -bottom coal minmg or similar ear with a ading body having a central portion and side wing-portions, and with stationary lading bottoms to the side wingortions, which bottoms are sloped for the dlscharge of the lading through openings made by the dropping of the bottom doors and for complete discharge between-the track rails, the combination of car wheels projecting into recesses in the side wing-portions so that the upper wheel flanges as disclosed in a vertical cross-section of the wheels are buried Within the said recesses, and deeply recessed wheel hoods over the tops of the wheels, and the inside walls of the said hoods extending substantially to the upright plane of the adjacent outside edges of the drop doors, together with still. endwise lading body supporting members outside the wheels, and axle spindles asso ciated with the said endwise members and supporting them. 7 In a four-Wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-portions, and with stationary lading bottoms to the side wing-portions, which bottoms are sloped for the discharge of the lading through openings made by the dropping of the bottom doors and for complete discharge between standard track rails, the combination of car wheels projecting into thesaid side wing-portions of the lading body, an? deeply recessed wheel hood-coverings ove the tops ofthe wheels, thsaid hood-coverings being sloped so as not to prevent the discharge of the lading through the dropped bottom doors, and the said bottom doors extending transversely substantially the full Width that will still permit ofworkingirlearances between the doors and the insides of the adjacent wheel flanges and track rails.

8. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-portions, and with stationary lading bottoms to the side wing-portions, which bottoms are sloped for the discharge bf the lading through openings made by the dropping of the bottom doors and for complete discharge between the track rails, the combination of car wheels projectinginto the said side wingportions of the lading body, and deeply recessed wheel hood-coverings over the tops of the wheels, the said hood-coverings being sloped so as not to prevent the discharge of the lading through the dropped bottom doors, and the inside walls of the wheel hoodcover'ings extending substantially to the upright plane of the adjacent outside edges of the drop doors and the said bottom doors extending transversely substantially the full width that will still permitof working clearances between the doors and the insides of the adjacent wheel flanges and track rails.

9, In a four-Wheel drop-bottom coal minif ing or similar rail car with a lading body a having a central portion and side wing-pdrtions, and with stationary lading bottoms to said endwise members and supporting them, 1

and the said bottom doors extending transversely substantially the full width that will still permit of working clearances between the doors and the insides of the adjacent wheel flanges and track rails.

10. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-portions and with stationary lading bottoms to the side. wing-portions, which bottoms are ,sloped for the discharge of the lading through openings m ade by the dropping of the bottom doors and for discharge between the track rails, the combination of ear wheels projectin into the said side wing-portions of the ladlng body, and deeply recessed wheel hood-coverings over the tops of the wheels, the said hood-coverings being sloped so as not to prevent the discharge of the lading through the dropped bottom doors, and the plane of thesaid sloping bottoms of the side wing-portions cutting through the upright cross-sectional edge-line of the adjacent car wheels substantially outside the track-gauge line, the hood-coverings having the inside walls thereof disposed approximately in the vertical planes of the side edges of the discharge openings.

-11. In a four-wheel drop-bottom coal miningor similar rail car with a lading body having a central portion and side wing-pori tions, and with stationary lading bottoms to the side wing-portions, which bottoms are sloped for the discharge of the ladin through openings made by the dropping o the bottom doors and for complete discharge between the track rails, the combination of car wheel projecting into the said side wingportionsof the lading body, and deeply reessed wheel hood-coverings over the tops of the wheels, the said hood-coverings be-' ing sloped so as not to prevent the discharge of the lading through the drop ed bottom doors, together with stiff endwise lading body supporting members outside the wheels, and axle spindles associated with the said endwise niernbers and supporting them, and the plane of the said sloping bottoms of the side wing-portions cutting through the upright cross-sectional edge-line of the adjacent, car

- track rails, the combination of car wheels ivheels substantially outside the track-gauge 12. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-portions, and with stationary ladin bottoms to the side wing-portions, which ttoms are sloped for the discharge of the lading through openings made by the dropping of the bottom doors and for discharge between the track rails, the combination of car wheels projecting into the said side wing-portions of the lading body, and deeply recessed wheel hood-coverings over the tops of the wheels, the said hood-coverings being sloped so as not to prevent the discharge of the lading through the dropped bottom doors, and the edges of the said drop doors approaching to within less than five inches of the upright planes of the adjacent track-gauge lines.

13. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-portions, and with stationary lading bottoms to the side win -portions, which bottoms are sloped for the d scharge of the lading through openings made by the dropping of the bottom doors and for complete discharge between the projecting into the said side wing-portions of the lading body, and deeply recessed wheel hood-coverings over the tops of the wheels, the said hood-coverings being sloped so as not to prevent the discharge of the lading through the dropped bottom doors, together with stilf endwise lading body supporting a members outside the wheels, and axle spindles.

associated with the said endwise members and supporting them, and the edges of the said drop doors appr oaching to within less than five inches of the upright planes of the adjacent track-gauge lines.

14. In a four-wheel drop-bottom coal mining or similar rail car with a lading, body having a central portion and side wing-portions, and with lading bottoms to the side wing-portions, which bottoms are sloped for the discharge of the lading thrdugh openings made by the dropping of the bottom doors and for discharge between the track rails, the combination of car wheels projecting into the said side wing-portions of the lading body, and deeply recessed wheel hoodcoverings over the tops of ,the wheels, the said hood-coverings being sloped so as not to prevent the, discharge of the lading through the dropped bottom doors, and having the inside walls thereof ,aptproximatel in the vertical planes of the s1 0 edges of the discharge o penin 15'. In a Eur-wheel drop-bottom coal I mining or similar'rail car witha lading body haviigacentral portion and side wing-portions, and-With lading bottoms to the side wi g portions, which bottoms are sloped for through openings made by the dropping o and for complete discharge between the track rails, the combination of car wheels projecting into the side wing-portions of the lading body, and deeply recessed wheel hoodcoverings over the tops of the wheels, the said hood-coverings being sloped so as not to prevent the discharge of the lading through the dropped bottom doors, together with stiff endwise lading body supporting members outside the wheels, and axle spindles associated with the said endwise members and supporting them.

16. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion and side wing-portions, and with stationary lading bottoms to the side win -portions, which bottoms are sloped for the discharge of the lading through openings made by the dropping of the bottom doors and for complete discharge between the track rails, the combination of car wheels pro'ecting into the said side wing-portions of t e ladlng body, and deeply recessed wheel hoods formed of separate members that are in rigid secured relationship with the said bottomsof the side wing-portions, and having the inside walls thereof approximately in the vertical planes of the side edges of thedischarge 0 enings.

17. In a our-wheel drop-bottom coal mining or similar rail car w1th a lading body having a central portion and side wing-portions, and with stationary ladingi bottoms to the side wing-portions, which ottoms are sloped for the discharge of the lading through openings made by the dropping of the bottom doors and for complete discharge between the track rails, the combination of car wheels projecting into the said side wingportions of the lading body, and deeply recessed wheel hoods formed of separate members that are in rigid secured relationship with the said bottoms of the side wing-portions, and the inside walls of the wheel hoods v extendin substantially to the upright plane at the a jacent outside edges of the drop oors.

18. In a four-wheel drop-bottom coal mining or similar rail car with a lading body with the said bottoms of the side W111 -portions, and theinside walls of the wheel oods extending substantially to the upright plane of the adjacent outside edges of the drop doors, together with stifi endwise lading body supporting members outside the wheels, and axle spindles associated in a supporting relationship with the said endwise members.

19. In a four-wheel drop bottom mine car, the combination of four supporting wheels having peripheral flanges, axles connected with the wheels, a car body carried by the wheels and having flared side walls inclined at an acute angle to a horizontal plane, the plane of each of said walls intersecting the top of the periphery of the car wheel at a point substantially outside of the trackgauge line at the base of the wheel flange, wings forming continuations of the flared portions of the side walls and extending downwardly therefrom defining the edges of a discharge opening in the bottom of the car controlled by a door, and hoods carried by the side walls to enclose the upper portions of the wheels, and having the inner faces thereof approximately in the upright planes of the win s.

20. In a four-w eel drop-bottom mine car, the combination of supporting wheels, :1 car body carried thereby and having flared side walls terminating in downwardly extending wings at the inner portion thereof defining the edges of a discharge opening in the bottom of the car controlled by a door, said flared portions having openings therein for the car wheels, and hoods enclosing the openings, said hoods having the inner faces thereof in approximately the same upright plane as the wings. A

21. In a four-wheel drop-bottom mine car, four supporting wheels arranged for operation on standard gauge track rails, axles carried thereby, supporting bearings carried by the axles on the outer sides of the wheels only, side sill structures carried by the bearings and disposed on the outer side of the wheels, and a lading body having a discharge opening in the bottom thereof arranged for complete discharge of the lading between the standard track rails.

22. In a four-wheel drop-bottom mine car, the combination of four car wheels arranged for operation on standard gauge track rails, axles carried thereby, supporting bearings carried by the axles on the outer sides of the car wheels, metallic side sills carried by the bearings on the outer sides only of the car wheels, end sills extending to points outside the track-gauge line and fixed to the side sills, and a body having flared side walls secured to and supported upon the side sills, said side walls terminating in downwardly extending wings, said Wings being entirely free from support by the end sills, tie members for the side walls and fixed thereto and to the side sills, one or more drop bottom doors for closing the bottom of the body and arranged for complete discharge of the lading between at an angle suflicient for the free discharge by gravity of loose coal through openings made by the dropping of bottom doors and for complete discharge between standard track rails, and supporting frame structure for the side wing-portions, the combination of car wheels projecting into the said side wingportions of the lading body, and deeply recessed wheel hoods formed of separate members that are in rigid secured relationshipwith the said bottoms of the side wingportions, the longitudinal upright walls being located inside the wheels and so close thereto as to provide only working clearance therebetween.

24. In a mine or similar rail car with a lading body having a central portion and side wing-portions, and having stationary lading bottoms to the side wing-portions, said bottoms being sloped for the complete discharge of the lading through openings made by the dropping of the bottom doors and for discharge between main mine track rails, and frame structure supporting said side wingportions, the combination of car wheels, car axles, a plurality of transversely hinged drop doors, and longitudinal upright walls inside the wheels and spaced from the wheels so as to provide only a working clearance therebetween, said upright walls forming a sealing relationship with the longitudinal sides of the said drop doors.

25. In a mine or similar rail car with a lading body having a central portion and side wing-portions, and having stationary lading bottoms to the side wing-portions, said bottoms being sloped for the complete dischar e of the lading through openings made by tlie dropping of the bottom doors and for discharge between main mine track rails, the combination of carwheels, car axles, a plurality of transversely hinged drop doors, and longitudinal upright walls inside the wheels and spaced from the wheels so as to provide only a working clearance, said upright walls forming a sealing relationship with the longitudinal sides of the said drop doors, said car having load-supporting longitudinal sill-members outside the car wheels.

26. In a mine or similar rail car, the combination of car wheels, car axles, and lading body, a traction truck frame including transverse bumper sill structures at each end of the lading body which are longer than the distance between the rails, hinged drop doors arranged for the complete discharge of the lading load between the track rails and on both sides of each car axle, and a stationary sloping lading body wing-bottom extending transversely from inside a track rail to a point outside the rail and the said bottom being supported at least in part outside said track rail by the extension of the bumper sills.

27. In a four-wheel drop bottom coal min ing rail car with a lading body having longitudinal upright walls and side wing portions with stationary lading bottoms to the side wing portions, said bottoms extending laterally from the upper portions of the longitudinal upright walls at gravity discharge slopes and lying in planes cutting through the cross sectional edge lines of the wheels outside the track gauge lines for discharge of loose coal by gravity through openings made by the dropping of bottom doors and for discharge between standard track rails, and supporting frame structure for the side Wing portions, the combination of drop bottom doors for said body, car wheels projecting into said side wing portions of the lading bottom, and recessed wheel-hood coverings over the tops of the wheels, the longitudinal upright walls being disposed inside the wheels and so close to the wheels as to provide only working clearance therebetween.

' 28. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having longitudinal upright walls and side wing-portions, and with a stationary lading bottom to each side wing-portion extending laterally from the upper edges of the longitudinally upright walls at an angle of more than thirty-two degrees from the horizontal and in a plane cutting through the crosssectional edge lines of the adjacent car wheels outside the track gauge line and the said bottoms being adapted to discharge the lading by gravity through openings made by the dropping of bottom doors and for complete discharge between standard track rails, and supporting frame structure for the side Wing portions the combination of drop bottom doors for the body, car wheels projecting into said side wing-portions of the lading body, and deeply recessed wheel hood-coverings over the tops of the wheels, said hood-coverings being sloped so as not to prevent the discharge of the lading through the dropped bottom doors, the longitudinal upright walls being disposed inside the wheels and so close thereto as to provide only working clearance therebetween.

29. In a four-wheel drop-bottom coal mining or similar rail car with a lading body having a central portion, longitudinal upright walls and side wing-portions, and with a stationary lading bottom to each side wingportion extending laterally from the longitudinal upright walls at an angle of more than thirty-two degrees from the horizontal and in a plane cutting through the edge lines at upright cross sections of the adjacent car wheels outside the track gauge line, and said bottoms being adapted to discharge the lading through openings made by the dropping of the bottom doors and for complete discharge between standard track rails, and supporting the frame structure for the side wing portions,sthe combination of car wheels projecting so deeply into recesses in the side wingportions that the upper wheel tread surfaces as disclosed in the vertical cross-sections of the wheels are approximately buried within the said recesses, the longitudinal upri ht walls being disposed inside the wheels an so close thereto as to provide only working clearance therebetween.

In testimony whereof I have signed my name, in March, in the year one thousand nine hundred and thirty-one.

HENRY H. HUDSON.

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