CA2058661A1 - Road vehicle having a rear dump box - Google Patents
Road vehicle having a rear dump boxInfo
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- CA2058661A1 CA2058661A1 CA 2058661 CA2058661A CA2058661A1 CA 2058661 A1 CA2058661 A1 CA 2058661A1 CA 2058661 CA2058661 CA 2058661 CA 2058661 A CA2058661 A CA 2058661A CA 2058661 A1 CA2058661 A1 CA 2058661A1
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- beams
- floor
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Abstract
ABSTRACT OF THE DISCLOSURE
The structural design of a truck box is improved for mounting on a conventional chassis, the truck box being of the type which is pivotal about a transverse axis at the rear end of the truck box for lifting of the forward end of the truck box by a jack for discharge of pourable solid materials through a rear tail gate. The structure of the truck box includes a pair of longitudinal I-beams under the floor with the I-beams designed to constitute the main longitudinal support for the truck box. The floor can thus simply be a sheet laid across the top of the I-beam without the necessity for transverse structural ribs. Sidewalls also include no vertical structural ribs but include a fabricated longitudinal box section along the top edge to prevent outward bowing of the side walls. The longitudinal force on the truck box is transmitted to the jack by a pair of beams welded to the top of the I-beams and extending upwardly and forwardly therefrom to a cradle at the top of the front wall attached to the top of the jack. The structural design uses less material than conventional arrangements and is improved aerodynamically.
The structural design of a truck box is improved for mounting on a conventional chassis, the truck box being of the type which is pivotal about a transverse axis at the rear end of the truck box for lifting of the forward end of the truck box by a jack for discharge of pourable solid materials through a rear tail gate. The structure of the truck box includes a pair of longitudinal I-beams under the floor with the I-beams designed to constitute the main longitudinal support for the truck box. The floor can thus simply be a sheet laid across the top of the I-beam without the necessity for transverse structural ribs. Sidewalls also include no vertical structural ribs but include a fabricated longitudinal box section along the top edge to prevent outward bowing of the side walls. The longitudinal force on the truck box is transmitted to the jack by a pair of beams welded to the top of the I-beams and extending upwardly and forwardly therefrom to a cradle at the top of the front wall attached to the top of the jack. The structural design uses less material than conventional arrangements and is improved aerodynamically.
Description
2 ~ 3 6 ~ 1 ROAD VEHICLE HAVING A REAR DUMP BOX
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BAC~GROUND OF THE INVENTION
This invention relates to a road vehicle of the type having a rear dump box. The term "vehicle" herein is intended to include both a trailer for attachment to a separate tractor unit or to a vehicle which includes both the tractor unit and a frame arrangement on which the box is directly mounted.
Conventionally vehicles of the type having a rear dump box include a main chassis having a ground wheel assembly at a rear end connected to the chassis by suitable suspension arrangement. At the front end, the vehicle can include either a fifth wheel type hitch for connec~tion to a tractor unit in a semi trailing system or can include the front wheels of the tractor unit or can include front wheels which attach by a hitch arrangement to a separate tractor unit.
Conventionally the chassis includes a pair of longitudinal beams which connect from the front end of the vehicle to the ground wheel assembly at the rear end~
The truck box includes a floor which is horizontal and extends from the front to the rear of the box and from one side to the other side of the box. Along each side of the box is provided a vertical side wall. At a front : ; :
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end of the box is provided a front wall and also a tower arrangement for receiving the jack by which the front end of the box can be lifted from the chassis to discharge the load of a pourable solid material. At the rear end of the box is provided a tail gate section which includes at least a portion which can be opened to allow the discharge of the material as the box is raised. The box is also pivotally mounted at the rear end to the main chassis to allow the pivotal action to occur by which the front end is raised for the discharge of the load.
As the box must, during the discharge process, be supported upon the jack at the front end and the pivot mounting arrangement at the rear end, it is necessary that the box is thus a separate structural element which can accomodate the forces of the load and properly transmit those forces to the jack and to the frame at the rear end without bending or deformation of the box occuring during the di~charge process.
In order -to provide this structural strength, conventionally the truck box uses the side walls of the truck box as the main structural member which communicates the forces longitudinally to the jack at the front end and to the frame at the rear end. For this purpose, the floor includes a plurality of transverse beams or ribs which extend ~rom one side wall to ~ ~ .
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. : ~ ' - ' ; : ' ' the opposed side wall and are generally provided as shallow beams attached to the flat sheeting forming the floor itself.
The side walls are -then formed with a structural box section at the bottom edge extending along the full length of the box. In addition~ a second box section is provided at the top of the side wall and then a plurality of vertical ribs are provided in the side wall to connect the structural beams at the side wall and to form a truss arrangement. The tower or coupling arrangement between the front end of the box and the jack then communicates forces from the top of the jack to the sidewalls.
Similarly at the rear end of the box forces are communicated from the side walls inwardly to the pivotal mounting arrangement on the frame of the vehicle.
In addition longitudinal beams are provided along the length of the floor at positions spaced inwardly of the side walls and extending the full length of the box from the front wall to the tailgate section. However these beams are designed so that they are incapable of receiving the full load from the box since the main structural member of the box is constituted by the side walls. The longitudinal beams are therefore present to communicate or spread forces from the floor to more than one of the transverse beams. Thuæ an impacting load dropped onto the floor at a particular location -, . .
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along the length of the floor is communicated into forces applied to a number of the transverse beams through the longitudinal beams, thus reducing the strength necessary for each of the transverse beams individually.
This conventional arrangement is widely used and has been accepted as the norm for many years.
SUMMARY OF THE INVE:NTION
It is one object of the present invention to prcvide an improved structural arrangement for the box of a road vehicle of the type having a rear dump box.
According to the first aspect of the invention there is provided a road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front ~nd of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel ..~;
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assembly arranged ad]acent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the ~ront end wall of the box for raising the front end of the box to cause said discharge, the box incl~lding connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the f loor at a portion spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to constitute the main longitudinal structural members of the box, first beam means connected to .. . . .. ..
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, :' ~ ' ~ ' ' ' , said longitudinal beams for transmitting loading from thelongitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, two side beams each arranged longitudinally along a respective ona of the side walls at a position thereon spaced upwardly of the floor, those portions of the side walls between the front end and the rear end consisting solely of longitudinally smooth surfaces so as to be free from vertically extending structural ribs, and that portion of the floor between the front end and the rear end consisting solely of a flat sheet of metal extending across the box from one side wall to the opposed side wall and supported by said longitudinal beams so as to be free of transversely extending structural ribs.
According to a second aspect of the invention there is provided a road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extendin~ along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front end of the box upstand.ing from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear , ' ' ~` ,., -.
end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the s~pport assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assem~ly ~urther including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiviny force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to receive the majority of the vertical loading of ths box thereupon, beam means connected to said longitudinal beams for transmitting said loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, that portion of the floor between the front end and the rear end being substantially free of transversely extending structural ribs, and means on each of said side walls for preventing outward bowing of the side walls in response to force from the load.
According to a third aspect of the invention there is provided a road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horiæontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floo~, a front end wall at a front end of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to :',. ' ' ., ,"' '' , ' ~ , .
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allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at ; the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being .
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shaped and arranged to constitute the main longitudinal struc~ural members of the box, beam means connected to said longitudinal beams for transmitting said full loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, two side beam means each arranged longitudinally along a respective one of the side walls at a position thereon spaced upwardly of the floor, the floor being formed and arranged such that forces thereon from the load are primarily applied to said longitudinal beams and being substantially free from transverse structural members transmitting forces transversely to said side walls.
One or more embodiments of the i~vention will now be described in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
; Figure 1 is a side elevational view of a semi trailer including a liftable load carrying box according to the present invention~
Figure 2 is a cross sectional view along the lines 2-2 of Figure 1 with the main frame of the trailer omitted from the illustration of the box for convenience.
Figure 3 is a cross-sectional view along the lines 3-3 of Figure 1.
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Figure 4 is a cross sectional view alony the lines 4-4 of Figure 3.
In the drawings like characters of reference indicate corresponding parts in the different figures.
DETAILED DESCRIPTION
The trailer shown in Figure 1 comprises a truck box generally indicated at 10 mounted upon a frame generally indicated at 11. The frame 11 is shown only schematically as this is of a conventional natureO
The frame 11 includes an elongate frame structure extending along the full length of the trailer having at a forward end a king pin arrangement 12 again of conventional nature for attachment to the fifth wheel of a tractor unit.
The king pin includes a transverse plate 13 and a downwardly extending pin 14 for engagement with the coupling slot of the fifth wheel of the tractor.
At the rear end of the frame 11 is provided a ground wheel a~sembly generally indicated at 14 including two axles 15 and 16 each of which carries a suitable number of ground wheels 17 for supporting the ground wheel assembly in movement across the road surface. A construction of the ground wheel assembly is shown only schematically and this will of course include the necessar-y suspension arrangements and other : : : .
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conventional systems necessary for a trailer, which are of course well known to one skilled in the art.
The main fra~e 11 further comprises a pair of longitudinal beams shown best in Figure 3 and indicated at 18 and 19 respectively. The beams are shown as box beams but any suitable frame structure is possible. The beams can be interconnected by suitable transverse elements (not shown) to hold the longitudinal frame structurally rigid.
At the rear of the beam 18 and 19 is a transverse support assembly generally indicated at 20 defining a transverse pin 21 to which the box is pivotally mounted for lifting action about the transverse pin 21 in conven~ional manner. The ~tructure of the support assembly 20 is again shown only schematically as this can vary according to design requirements and is well known to one skilled in the art.
At the forward end of the longitudinal beams 18 and 19 just rearward of the king pin assembly 12 is provided a support cradle generally indicated at 22 for the lower end of a jack 23. Generally the jack 23 will comprise a multi stage hydraulic cylinder actuable to raise the upper end of the jack to lift the forward end of the box in a disharge action. The cylinder is again only shown schematically as the details of this will be apparent to one skilled in the art. It suffice to say that the cylinder includes a transverse pin 24 at a lower end for pivotal attachment to the cradle 22 so that the lower end of the cylinder can pivot forwardly and rearwardly to accomodate the arcuate movement of the front end of the box.
In addition the cylinder 23 includes a transverse pin 25 at an upper end for connection to the box as described hereinafter ~lthough the frame structure described above is -shown in relation to a trailer, it will be appreciated that the same frame structure can be directly attached to a tractor unit at the forward end or can include front ground wheels coupled to a steering hitch so that the frame forms part of a pup trailer. ~:~
Turning now to the structure of the box, the main detail of the structure is shown best in Figure 2. The box structure thus comprises a floor 30, a front wall 31, two side walls 32 and 33, a rear tail gate section 34 (Figure 1) and a pair of longitudinal support beams 35 and 36.
The floor 30 consists solely of a flat sheet of steel or other suitable metal without the addition of transverse supporting ribs, which are conventional in the manufacture of boxes of this nature. The floor sits directly on top of the beams 35 and 36 each of which extends along the full length of the floor from the front wall 31 to the tailgate - ~ .:: , - , .~
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section 34. Each of the beams comprises a flanged beam sec-tion generally of an "I-beam" or "Z-beam" shape including a top flange 37, a bottom flange 38 and a single vertical web 39.
The top horizontal flange 37 is formed integrally with the web 39 by bending the plate from which the web is formed. The bottom horizontal flange 38 is welded along the bottom edge of the web 39 at an intermediate point 40 so that an inner edge 41 of the web 38 projects inwardly from the inside surface of the web 39 and the outer edge 41 of the web 38 projects outwardly from the outer surface of the web 39. However the intermediate point 40 is offset so that only a short portion of the flange project~ inwardly. As shown in Figure 3, the shape allows the box beam 18 to pass inside the edge ~1 of the bottom flange 38 but with the top edge of the box beam engaging the underside of the top flange 37 to allow the top flange 37 to rest on the top of the box beam when in a normal lowered condi~ion of the box on the frame.
As shown in Figure 1, a central portion of the vertical web 39 of the beam 35, the portion being indicated at 39A, is of increased height. The central or intermediate portion 39A is located forwardly of the wheel assembly and rearwardly of the tractor unit and is provided to increase the structural strength of the I-beam members at the central : ~ ; '.'`
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location which is the area which receives the maximum loading when transmitting forces from the load on the floor forwardly and rearwardly to the jack at the front and to the support section 20 at the rear.
The side walls 32 and 33 are identical in structure so that only one of these will be described. Thus the side wall 32 is formed of four pieces 43,44,43A,44A. The first piece 43~ includes a flange portion 45 at an upper end which turns outwardly at right angles to the vertical height of the side wall extends substantially vertically downwardly therefrom. The piece 43 includes a top flange 50 connected to the flange 45 at a weld line D. The piece 43 then turns vertically downwardly at a position 51 and inwardly at a position 52 the bottom edge of which is welded to the bottom of the piece 43A and at a weld line B. The piece 43 further includes a portion 53 3xtending dc,wnwardly from the weld line and forming a straight line with the piece 43A thus defining the inside wall of the side wall 32. The piece 44 commences at a weld line A on the outside o the porton 53 and extends outwardly and downwardly therefrom in a position 55, vertically downwardly in a posi-tion 56 and downwardly and inwardly in a position 57. The bottom of the portion 57 is welded at a weld line C to the bottom edge of the portion 53. The pie~e 44 ,' .~ . ': ' .: .'i .
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further includes a vertical portion 46 which extends downwardly from the weld line C and includes an outturned portion 47 which is inclined outwardly and downwardly from the portion 46. From the outer edge of the inclined portion 47 is provided a vertical portion 48 which extends downwardly into contact with the outer edge of the floor 30 with a flange 49 turned at right angles to the portion 48 to tuck underneath the floor 30. The portion 48 is then welded to the floor along a weld line E.
The fourth piece 44A is welded at a weld line E
to the bottom edge of the vertical portion 46 and is inclined downwa dly and inwardly to a weld line G at the floor 30.
Thus the portions 50, 51 and 52 o:E the outer sheet together with the vertical portion of the inner piece 43 form a fabricated box beam at the top edge of the side wall. The box beam is completed by welding along the line indicated at B and D.
A second box beam underneath the upper most box beam is defined by the inclined wall portion 55 of the piece 44, the vertically depending portion 56, and the inwardly and downwardly inclined portion 57. The portions 55, 56 and 57 cooperate with the vertical portion of the sheet 43 to form a hollow box beam completed by welding along the lines indicated at A and C. A third box beam is provided by the portion 6 ~ .~
47,48,44A and the outer part of the floor 30 connected at the weld lines E, F and G.
It will be noted that the side wall is formed without any vertical struts, beams or ribs or other vertical structural members so that the only vertical element of the side wall is defined by the sheet forming part of the side wall itself which are reinforced by the longitudir,ally extending box bea~s. Thus the side wall is formed only by smoothly longitudinally extending wall portions.
In order to prevent twisting of the beams 35 and 36, a plurality of interconnecting struts 58 are provided at spaced positions along the length of the beams. Each strut 58 extends from a pad 59 on an upper surface of the flange 38 or on the web 39 (not shown) to a pad 60 attached to the underside of the floor 30. These struts are only limited in number and in one example three such struts can be provided at spaced positions along the length of each of the beams. The struts are not intenaed to communicate forces from the outer edge of the floor to the beam but are simply there to prevent the lower edge of the beam tending to twist inwardly or outwardly under bending loads.
Turning now to Figures 3 and 4, the forward end of the box is shown in more detail and particularly the forward ' .
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end of the beams 35 and 36 is shown including the bottom flange 38, the upstanding web 39 and the top flange 37.
To the top flange of each of the beams 35 and 36 is welded a respective one of a pair of upstanding beams 61 and 62. Each of the beams 61 and 62 comprises a box heam or open channel or otehr member capable of transmitting longitudinal tension forces, attached at its lower end to the flange 37 and extending generally upwardly therefrom to a coupling section generally indicated at 63 for receiving the upper end of the jack 23. Each beam 61, 62 is inclined upwardly and forwardly as shown in Figure 4 and is also inclined inwardly as shown in Figure 3. On the inside surface of each of the beams 61 and 62 is attached the front wall 31 so that the front wall 31 is similarly inclined as shown in Figure 4~ Across the top of the beams 61 and 62 and the front wall 31 is attached a front cap 64 which includes a horizontal flange 65, a front depending flange portion 66 and a rear depending flange portion 67 which extends downwardly and then forwardly. The interconnection between the beam 61, 62 and the cap 64 provide a structural strength for receiving the transverse pin 25 which extends through an upper part of the beams 61 and 62 to communicate the force thereto from the jack 23. The jack 23 is thus located outside khe box on the forward side of the front wall 31. The :' '' ', 2~6~1 upward and forward inclination of the front wa~l provides an attractive aerodynamic appearance and the beams 61 and 62 provide a simple attractive structure receiving and housing the jack 23. As shown in Figure 1, the upper part of the jack can be encased within a depending shroud 67 to prevent the penetration of moisture or other contaminants.
The longitudinal strength for the box for communication of forces from the load both to the jack at the forward end and to the pivot mounting 20 at the rearward end is provided mainly by the I-beams 35 and 36 so that the I beams constitute the main longitudinal structural members of the box.
The floor includes no transverse elements communicating forces to the side walls and it is not intended that the side walls act, as in the conventional construction, to communicate the majority of the forces in the longitudinal direction. The I-beams are thus selected according to good enginQering principles to provide suff icient strength to accomodate the bending forces applied to the box by the load across the forward and rearward ends as described above. The floor therefore does not need transverse elements transmitting forces outwardly to the sides. The floor is thus constituted solely by a single sheet which is sufficient to carry the loads and to transmit those loads inwardly from the side edges to the .. , :. ., .
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I-beams 35 and 36. The side walls do however pre~ent the otusrmost edges of the floor from bending downwardly and thus do receive some of the vertical loading from the floor. In one practical example, this proportion of the loading may be 2S% of the total loading. This loading is transmikted back to the jack at the forward end by the front sheet 31 and to the transverse beam 20 at the rear end.
The side walls include no vertical structural members and include basically a box beam along the upper edge which is provided for the primary reason of preventing outward bowing of the sides due to the outward pressure from the load when stacked above the floor to a height adjacent the top of the side walls.
As the forces from the load are thus transmitted along the I-beams to the forward end, the upright beam 61 and 62 thus are connected directly to the I-beams and communicate the forces upwardly therefrom to the coupling means or cradle at the top of the jack. The forces from the jack can be communicated outwardly to the sides of the box through the sheet 31 since the sides are used for the transmission of only a smaller proportion of the bending loads~
The structure described above has the following advantages relative to conventional truck box structures . :.
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described hereinbefore in the preamble.
1. The loads are transmitted more efficiently using less materials thus significantly decreasing the weight of the box as a whole and significantly reducing the cost of manufacture due to the reduction in materials.
2. The absence of transverse members in the floor prevents the floor from forming depressions or bowed sections between each transverse member in the next (known as "washboarding"). These depressions in the floor are known to inhibit discharge of the ~aterials from the box since the floor is no longer a smooth channel from which the rnaterial can readily flow. In the present dev:ice any such bowing of the floor will form three troughs longitudinally in the floor which will not inter~ere with the sliding action of the material during discharge.
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BAC~GROUND OF THE INVENTION
This invention relates to a road vehicle of the type having a rear dump box. The term "vehicle" herein is intended to include both a trailer for attachment to a separate tractor unit or to a vehicle which includes both the tractor unit and a frame arrangement on which the box is directly mounted.
Conventionally vehicles of the type having a rear dump box include a main chassis having a ground wheel assembly at a rear end connected to the chassis by suitable suspension arrangement. At the front end, the vehicle can include either a fifth wheel type hitch for connec~tion to a tractor unit in a semi trailing system or can include the front wheels of the tractor unit or can include front wheels which attach by a hitch arrangement to a separate tractor unit.
Conventionally the chassis includes a pair of longitudinal beams which connect from the front end of the vehicle to the ground wheel assembly at the rear end~
The truck box includes a floor which is horizontal and extends from the front to the rear of the box and from one side to the other side of the box. Along each side of the box is provided a vertical side wall. At a front : ; :
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end of the box is provided a front wall and also a tower arrangement for receiving the jack by which the front end of the box can be lifted from the chassis to discharge the load of a pourable solid material. At the rear end of the box is provided a tail gate section which includes at least a portion which can be opened to allow the discharge of the material as the box is raised. The box is also pivotally mounted at the rear end to the main chassis to allow the pivotal action to occur by which the front end is raised for the discharge of the load.
As the box must, during the discharge process, be supported upon the jack at the front end and the pivot mounting arrangement at the rear end, it is necessary that the box is thus a separate structural element which can accomodate the forces of the load and properly transmit those forces to the jack and to the frame at the rear end without bending or deformation of the box occuring during the di~charge process.
In order -to provide this structural strength, conventionally the truck box uses the side walls of the truck box as the main structural member which communicates the forces longitudinally to the jack at the front end and to the frame at the rear end. For this purpose, the floor includes a plurality of transverse beams or ribs which extend ~rom one side wall to ~ ~ .
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. : ~ ' - ' ; : ' ' the opposed side wall and are generally provided as shallow beams attached to the flat sheeting forming the floor itself.
The side walls are -then formed with a structural box section at the bottom edge extending along the full length of the box. In addition~ a second box section is provided at the top of the side wall and then a plurality of vertical ribs are provided in the side wall to connect the structural beams at the side wall and to form a truss arrangement. The tower or coupling arrangement between the front end of the box and the jack then communicates forces from the top of the jack to the sidewalls.
Similarly at the rear end of the box forces are communicated from the side walls inwardly to the pivotal mounting arrangement on the frame of the vehicle.
In addition longitudinal beams are provided along the length of the floor at positions spaced inwardly of the side walls and extending the full length of the box from the front wall to the tailgate section. However these beams are designed so that they are incapable of receiving the full load from the box since the main structural member of the box is constituted by the side walls. The longitudinal beams are therefore present to communicate or spread forces from the floor to more than one of the transverse beams. Thuæ an impacting load dropped onto the floor at a particular location -, . .
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along the length of the floor is communicated into forces applied to a number of the transverse beams through the longitudinal beams, thus reducing the strength necessary for each of the transverse beams individually.
This conventional arrangement is widely used and has been accepted as the norm for many years.
SUMMARY OF THE INVE:NTION
It is one object of the present invention to prcvide an improved structural arrangement for the box of a road vehicle of the type having a rear dump box.
According to the first aspect of the invention there is provided a road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front ~nd of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel ..~;
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assembly arranged ad]acent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the ~ront end wall of the box for raising the front end of the box to cause said discharge, the box incl~lding connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the f loor at a portion spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to constitute the main longitudinal structural members of the box, first beam means connected to .. . . .. ..
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, :' ~ ' ~ ' ' ' , said longitudinal beams for transmitting loading from thelongitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, two side beams each arranged longitudinally along a respective ona of the side walls at a position thereon spaced upwardly of the floor, those portions of the side walls between the front end and the rear end consisting solely of longitudinally smooth surfaces so as to be free from vertically extending structural ribs, and that portion of the floor between the front end and the rear end consisting solely of a flat sheet of metal extending across the box from one side wall to the opposed side wall and supported by said longitudinal beams so as to be free of transversely extending structural ribs.
According to a second aspect of the invention there is provided a road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extendin~ along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front end of the box upstand.ing from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear , ' ' ~` ,., -.
end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the s~pport assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assem~ly ~urther including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiviny force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to receive the majority of the vertical loading of ths box thereupon, beam means connected to said longitudinal beams for transmitting said loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, that portion of the floor between the front end and the rear end being substantially free of transversely extending structural ribs, and means on each of said side walls for preventing outward bowing of the side walls in response to force from the load.
According to a third aspect of the invention there is provided a road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horiæontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floo~, a front end wall at a front end of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to :',. ' ' ., ,"' '' , ' ~ , .
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allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at ; the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being .
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shaped and arranged to constitute the main longitudinal struc~ural members of the box, beam means connected to said longitudinal beams for transmitting said full loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, two side beam means each arranged longitudinally along a respective one of the side walls at a position thereon spaced upwardly of the floor, the floor being formed and arranged such that forces thereon from the load are primarily applied to said longitudinal beams and being substantially free from transverse structural members transmitting forces transversely to said side walls.
One or more embodiments of the i~vention will now be described in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
; Figure 1 is a side elevational view of a semi trailer including a liftable load carrying box according to the present invention~
Figure 2 is a cross sectional view along the lines 2-2 of Figure 1 with the main frame of the trailer omitted from the illustration of the box for convenience.
Figure 3 is a cross-sectional view along the lines 3-3 of Figure 1.
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Figure 4 is a cross sectional view alony the lines 4-4 of Figure 3.
In the drawings like characters of reference indicate corresponding parts in the different figures.
DETAILED DESCRIPTION
The trailer shown in Figure 1 comprises a truck box generally indicated at 10 mounted upon a frame generally indicated at 11. The frame 11 is shown only schematically as this is of a conventional natureO
The frame 11 includes an elongate frame structure extending along the full length of the trailer having at a forward end a king pin arrangement 12 again of conventional nature for attachment to the fifth wheel of a tractor unit.
The king pin includes a transverse plate 13 and a downwardly extending pin 14 for engagement with the coupling slot of the fifth wheel of the tractor.
At the rear end of the frame 11 is provided a ground wheel a~sembly generally indicated at 14 including two axles 15 and 16 each of which carries a suitable number of ground wheels 17 for supporting the ground wheel assembly in movement across the road surface. A construction of the ground wheel assembly is shown only schematically and this will of course include the necessar-y suspension arrangements and other : : : .
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conventional systems necessary for a trailer, which are of course well known to one skilled in the art.
The main fra~e 11 further comprises a pair of longitudinal beams shown best in Figure 3 and indicated at 18 and 19 respectively. The beams are shown as box beams but any suitable frame structure is possible. The beams can be interconnected by suitable transverse elements (not shown) to hold the longitudinal frame structurally rigid.
At the rear of the beam 18 and 19 is a transverse support assembly generally indicated at 20 defining a transverse pin 21 to which the box is pivotally mounted for lifting action about the transverse pin 21 in conven~ional manner. The ~tructure of the support assembly 20 is again shown only schematically as this can vary according to design requirements and is well known to one skilled in the art.
At the forward end of the longitudinal beams 18 and 19 just rearward of the king pin assembly 12 is provided a support cradle generally indicated at 22 for the lower end of a jack 23. Generally the jack 23 will comprise a multi stage hydraulic cylinder actuable to raise the upper end of the jack to lift the forward end of the box in a disharge action. The cylinder is again only shown schematically as the details of this will be apparent to one skilled in the art. It suffice to say that the cylinder includes a transverse pin 24 at a lower end for pivotal attachment to the cradle 22 so that the lower end of the cylinder can pivot forwardly and rearwardly to accomodate the arcuate movement of the front end of the box.
In addition the cylinder 23 includes a transverse pin 25 at an upper end for connection to the box as described hereinafter ~lthough the frame structure described above is -shown in relation to a trailer, it will be appreciated that the same frame structure can be directly attached to a tractor unit at the forward end or can include front ground wheels coupled to a steering hitch so that the frame forms part of a pup trailer. ~:~
Turning now to the structure of the box, the main detail of the structure is shown best in Figure 2. The box structure thus comprises a floor 30, a front wall 31, two side walls 32 and 33, a rear tail gate section 34 (Figure 1) and a pair of longitudinal support beams 35 and 36.
The floor 30 consists solely of a flat sheet of steel or other suitable metal without the addition of transverse supporting ribs, which are conventional in the manufacture of boxes of this nature. The floor sits directly on top of the beams 35 and 36 each of which extends along the full length of the floor from the front wall 31 to the tailgate - ~ .:: , - , .~
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section 34. Each of the beams comprises a flanged beam sec-tion generally of an "I-beam" or "Z-beam" shape including a top flange 37, a bottom flange 38 and a single vertical web 39.
The top horizontal flange 37 is formed integrally with the web 39 by bending the plate from which the web is formed. The bottom horizontal flange 38 is welded along the bottom edge of the web 39 at an intermediate point 40 so that an inner edge 41 of the web 38 projects inwardly from the inside surface of the web 39 and the outer edge 41 of the web 38 projects outwardly from the outer surface of the web 39. However the intermediate point 40 is offset so that only a short portion of the flange project~ inwardly. As shown in Figure 3, the shape allows the box beam 18 to pass inside the edge ~1 of the bottom flange 38 but with the top edge of the box beam engaging the underside of the top flange 37 to allow the top flange 37 to rest on the top of the box beam when in a normal lowered condi~ion of the box on the frame.
As shown in Figure 1, a central portion of the vertical web 39 of the beam 35, the portion being indicated at 39A, is of increased height. The central or intermediate portion 39A is located forwardly of the wheel assembly and rearwardly of the tractor unit and is provided to increase the structural strength of the I-beam members at the central : ~ ; '.'`
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location which is the area which receives the maximum loading when transmitting forces from the load on the floor forwardly and rearwardly to the jack at the front and to the support section 20 at the rear.
The side walls 32 and 33 are identical in structure so that only one of these will be described. Thus the side wall 32 is formed of four pieces 43,44,43A,44A. The first piece 43~ includes a flange portion 45 at an upper end which turns outwardly at right angles to the vertical height of the side wall extends substantially vertically downwardly therefrom. The piece 43 includes a top flange 50 connected to the flange 45 at a weld line D. The piece 43 then turns vertically downwardly at a position 51 and inwardly at a position 52 the bottom edge of which is welded to the bottom of the piece 43A and at a weld line B. The piece 43 further includes a portion 53 3xtending dc,wnwardly from the weld line and forming a straight line with the piece 43A thus defining the inside wall of the side wall 32. The piece 44 commences at a weld line A on the outside o the porton 53 and extends outwardly and downwardly therefrom in a position 55, vertically downwardly in a posi-tion 56 and downwardly and inwardly in a position 57. The bottom of the portion 57 is welded at a weld line C to the bottom edge of the portion 53. The pie~e 44 ,' .~ . ': ' .: .'i .
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further includes a vertical portion 46 which extends downwardly from the weld line C and includes an outturned portion 47 which is inclined outwardly and downwardly from the portion 46. From the outer edge of the inclined portion 47 is provided a vertical portion 48 which extends downwardly into contact with the outer edge of the floor 30 with a flange 49 turned at right angles to the portion 48 to tuck underneath the floor 30. The portion 48 is then welded to the floor along a weld line E.
The fourth piece 44A is welded at a weld line E
to the bottom edge of the vertical portion 46 and is inclined downwa dly and inwardly to a weld line G at the floor 30.
Thus the portions 50, 51 and 52 o:E the outer sheet together with the vertical portion of the inner piece 43 form a fabricated box beam at the top edge of the side wall. The box beam is completed by welding along the line indicated at B and D.
A second box beam underneath the upper most box beam is defined by the inclined wall portion 55 of the piece 44, the vertically depending portion 56, and the inwardly and downwardly inclined portion 57. The portions 55, 56 and 57 cooperate with the vertical portion of the sheet 43 to form a hollow box beam completed by welding along the lines indicated at A and C. A third box beam is provided by the portion 6 ~ .~
47,48,44A and the outer part of the floor 30 connected at the weld lines E, F and G.
It will be noted that the side wall is formed without any vertical struts, beams or ribs or other vertical structural members so that the only vertical element of the side wall is defined by the sheet forming part of the side wall itself which are reinforced by the longitudir,ally extending box bea~s. Thus the side wall is formed only by smoothly longitudinally extending wall portions.
In order to prevent twisting of the beams 35 and 36, a plurality of interconnecting struts 58 are provided at spaced positions along the length of the beams. Each strut 58 extends from a pad 59 on an upper surface of the flange 38 or on the web 39 (not shown) to a pad 60 attached to the underside of the floor 30. These struts are only limited in number and in one example three such struts can be provided at spaced positions along the length of each of the beams. The struts are not intenaed to communicate forces from the outer edge of the floor to the beam but are simply there to prevent the lower edge of the beam tending to twist inwardly or outwardly under bending loads.
Turning now to Figures 3 and 4, the forward end of the box is shown in more detail and particularly the forward ' .
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end of the beams 35 and 36 is shown including the bottom flange 38, the upstanding web 39 and the top flange 37.
To the top flange of each of the beams 35 and 36 is welded a respective one of a pair of upstanding beams 61 and 62. Each of the beams 61 and 62 comprises a box heam or open channel or otehr member capable of transmitting longitudinal tension forces, attached at its lower end to the flange 37 and extending generally upwardly therefrom to a coupling section generally indicated at 63 for receiving the upper end of the jack 23. Each beam 61, 62 is inclined upwardly and forwardly as shown in Figure 4 and is also inclined inwardly as shown in Figure 3. On the inside surface of each of the beams 61 and 62 is attached the front wall 31 so that the front wall 31 is similarly inclined as shown in Figure 4~ Across the top of the beams 61 and 62 and the front wall 31 is attached a front cap 64 which includes a horizontal flange 65, a front depending flange portion 66 and a rear depending flange portion 67 which extends downwardly and then forwardly. The interconnection between the beam 61, 62 and the cap 64 provide a structural strength for receiving the transverse pin 25 which extends through an upper part of the beams 61 and 62 to communicate the force thereto from the jack 23. The jack 23 is thus located outside khe box on the forward side of the front wall 31. The :' '' ', 2~6~1 upward and forward inclination of the front wa~l provides an attractive aerodynamic appearance and the beams 61 and 62 provide a simple attractive structure receiving and housing the jack 23. As shown in Figure 1, the upper part of the jack can be encased within a depending shroud 67 to prevent the penetration of moisture or other contaminants.
The longitudinal strength for the box for communication of forces from the load both to the jack at the forward end and to the pivot mounting 20 at the rearward end is provided mainly by the I-beams 35 and 36 so that the I beams constitute the main longitudinal structural members of the box.
The floor includes no transverse elements communicating forces to the side walls and it is not intended that the side walls act, as in the conventional construction, to communicate the majority of the forces in the longitudinal direction. The I-beams are thus selected according to good enginQering principles to provide suff icient strength to accomodate the bending forces applied to the box by the load across the forward and rearward ends as described above. The floor therefore does not need transverse elements transmitting forces outwardly to the sides. The floor is thus constituted solely by a single sheet which is sufficient to carry the loads and to transmit those loads inwardly from the side edges to the .. , :. ., .
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I-beams 35 and 36. The side walls do however pre~ent the otusrmost edges of the floor from bending downwardly and thus do receive some of the vertical loading from the floor. In one practical example, this proportion of the loading may be 2S% of the total loading. This loading is transmikted back to the jack at the forward end by the front sheet 31 and to the transverse beam 20 at the rear end.
The side walls include no vertical structural members and include basically a box beam along the upper edge which is provided for the primary reason of preventing outward bowing of the sides due to the outward pressure from the load when stacked above the floor to a height adjacent the top of the side walls.
As the forces from the load are thus transmitted along the I-beams to the forward end, the upright beam 61 and 62 thus are connected directly to the I-beams and communicate the forces upwardly therefrom to the coupling means or cradle at the top of the jack. The forces from the jack can be communicated outwardly to the sides of the box through the sheet 31 since the sides are used for the transmission of only a smaller proportion of the bending loads~
The structure described above has the following advantages relative to conventional truck box structures . :.
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described hereinbefore in the preamble.
1. The loads are transmitted more efficiently using less materials thus significantly decreasing the weight of the box as a whole and significantly reducing the cost of manufacture due to the reduction in materials.
2. The absence of transverse members in the floor prevents the floor from forming depressions or bowed sections between each transverse member in the next (known as "washboarding"). These depressions in the floor are known to inhibit discharge of the ~aterials from the box since the floor is no longer a smooth channel from which the rnaterial can readily flow. In the present dev:ice any such bowing of the floor will form three troughs longitudinally in the floor which will not inter~ere with the sliding action of the material during discharge.
3. The absence of vertical ribs on the outside surface o the side walls significantly improves the aerodynamic effect of the truc~ box. Thus the conventional vertical ribs of the truck box significantly interfere with the smooth flow of air along the sides of the truck box and this is prevented in the present design by the longitudinally smooth or flat surfaces which form the side walls without vertical restriction to flow.
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4. The appearance of the truck box is significantly improved due to the smooth sides and due to the inclined front wall and the neat and simple appearance oP the structural members at the front end.
5. The absence of transverse members both across the floor and vertically of the side walls allows a significantly easier cleaning of the box to maintain the attractive appearance.
Since various modifications can be made in my invention as hereinabove described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
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Since various modifications can be made in my invention as hereinabove described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without departing from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
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Claims
(1) A road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front end of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a portion spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to constitute the main longitudinal structural members of the box, first beam means connected to said longitudinal beams for transmitting loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, two side beams each arranged longitudinally along a respective one of the side walls at a position thereon spaced upwardly of the floor, those portions of the side walls between the front end and the rear end consisting solely of longitudinally smooth surfaces so as to be free from vertically extending structural ribs, and that portion of the floor between the front end and the rear end consisting solely of a flat sheet of metal extending across the box from one side wall to the opposed side wall and supported by said longitudinal beams so as to be free of transversely extending structural ribs.
(2) The road vehicle according to Claim 1 wherein each of the longitudinal beams comprises a top horizontal flange, a bottom horizontal flange and a single vertical web extending therebetween.
(3) The road vehicle according to Claim 2 wherein the top flange has one edge thereof connected to a top edge of the web and extending inwardly therefrom and wherein the bottom flange has an inner edge thereof projecting inwardly from a bottom edge of the web, an outer edge thereof projecting outwardly from a bottom edge of the web and the bottom edge of the web connected to an intermediate line along the length of the bottom flange, the intermediate line being offset from a centre of the web toward the inner edge.
(4) The road vehicle according to Claim 1, 2 or 3 wherein an intermediate portion of each of the beams along the length of the respective beam is increased in height.
(5) The road vehicle according to Claim 1 wherein each of the side beam means comprises a closed box section.
(6) The road vehicle according to Claim wherein each of the side beam means is fabricated from an inner sheet and an outer sheet welded thereto, at least one of the inner and outer sheets being formed to define top and bottom walls of the box section.
(7) The road vehicle according to Claim wherein each of the side beam means is arranged at a top edge of the respective side wall.
(8) The road vehicle according to Claim 6 wherein the inner sheet includes a portion thereof extending substantially vertically and wherein the outer sheet includes a horizontal portion attached to a top edge of the inner sheet and extending outwardly therefrom to define said box section at a top edge of the inner sheet.
(9) The road vehicle according to Claim 8 wherein the outer sheet includes a second outwardly extending portion spaced downwardly of the box section at the top edge to define a second side beam spaced downwardly of the box section at the top edge.
(10) The road vehicle according to Claim 1 wherein said first beam means comprises a pair of upstanding beams, each connected at a lower end thereof to a respective one of the longitudinal beams and extending generally upwardly therefrom to said connecting means at a height above said longitudinal beams.
(11) The road vehicle according to Claim 10 wherein each of the upright beams is inclined inwardly from the longitudinal beam to said connecting means such that the spacing between the upright beams at the connecting means is reduced relative to the spacing at the longitudinal beams.
(12) The road vehicle according to Claim 10 or 11 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams.
(13) The road vehicle according to Claim 10 or 11 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams, and wherein the front end wall of the box is positioned inside said upright beams and is attached to said upright beams so as to be inclined forwardly and upwardly from a forward end of the longitudinal beams.
(14) A road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front end of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gats section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to receive the majority of the vertical loading of the box thereupon, beam means connected to said longitudinal beams for transmitting said loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, that portion of the floor between the front end and the rear end being substantially free of transversely extending structural ribs, and means on each of said side walls for preventing outward bowing of the side walls in response to force from the load.
(15) The road vehicle according to Claim 14 wherein each of the longitudinal beams comprises a top horizontal flange, a bottom horizontal flange and a single vertical web extending therebetween.
(16) The road vehicle according to Claim 15 wherein the top flange has one edge thereof connected to a top edge of the web and extending inwardly therefrom and wherein the bottom flange has an inner edge thereof projecting inwardly from a bottom edge of the web, an outer edge thereof projecting outwardly from a bottom edge of the web and the bottom edge of the web connected to an intermediate line along the length of the bottom flange, the intermediate line being offset from a centre of the web toward the inner edge.
(17) The road vehicle according to Claim 14, 15 or 16 wherein an intermediate portion of each of the beams along the length of the respective beam is increased in height.
(18) The road vehicle according to Claim 14 wherein said means on each of said side walls comprises side beam members defined by a closed box section.
(19) The road vehicle according to Claim 18 wherein each of the side beam means is fabricated from an inner sheet and an outer sheet welded thereto, at least one of the inner and outer sheets being formed to define top and bottom walls of the box section.
(20) The road vehicle according to Claim 18 wherein each of the side beam means is arranged at a top edge of the respective side wall.
(21) The road vehicle according to Claim 19 wherein the inner sheet includes a portion thereof extending substantially vertically and wherein the outer sheet includes a horizontal portion attached to a top edge of the inner sheet and extending outwardly therefrom to define said box section at a top edge of the inner sheet.
(22) The road vehicle according to Claim 21 wherein the outer sheet includes a second outwardly extending portion spaced downwardly of the box section at the top edge to define a second side beam spaced downwardly of the box section at the top edge.
(23) The road vehicle according to Claim 14 wherein said beam means comprises a pair of upstanding beams, each connected at a lower end thereof to a respective one of the longitudinal beams and extending generally upwardly therefrom to said connecting means at a height above said longitudinal beams.
(24) The road vehicle according to Claim 23 wherein each of the upright beams is inclined inwardly from the longitudinal beam to said connecting means such that the spacing between the upright beams at the connecting means is reduced relative to the spacing at the longitudinal beams.
(25) The road vehicle according to Claim 23 or 24 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams.
(26) The road vehicle according to Claim 23 or 24 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams, and wherein the front end wall of the box is positioned inside said upright beams and is attached to said upright beams so as to be inclined forwardly and upwardly from a forward end of the longitudinal beams.
(27) A road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front end of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to constitute the main longitudinal structural members of the box, beam means connected to said longitudinal beams for transmitting loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, two side beam means each arranged longitudinally along a respective one of the side walls at a position thereon spaced upwardly of the floor, the floor being formed and arranged such that forces thereon from the load are primarily applied to said longitudinal beams and being substantially free from transverse structural members transmitting forces transversely to said side walls.
(28) The road vehicle according to Claim 27 wherein each of the longitudinal beams comprises a top horizontal flange, a bottom horizontal flange and a single vertical web extending therebetween.
(29) The road vehicle according to Claim 28 wherein the top flange has one edge thereof connected to a top edge of the web and extends inwardly therefrom and wherein the bottom flange has an inner edge thereof projecting inwardly from a bottom edge of the web, an outer edge thereof projecting outwardly from a bottom edge of the web and the bottom edge of the web connected to an intermediate line along the length of the bottom flange, the intermediate line being offset from a centre of the web toward the inner edge.
(30) The road vehicle according to Claim 27, 28 or 29 wherein an intermediate portion of each of the beams along the length of the respective beam is increased in height.
(31) The road vehicle according to Claim 27 wherein each of the side beam means comprises a closed box section.
(32) The road vehicle according to Claim 31 wherein each of the side beam means is fabricated from an inner sheet and an outer sheet welded thereto, at least one of the inner and outer sheets being formed to define top and bottom walls of the box section.
(33) The road vehicle according to Claim 27 wherein each of the side beam means is arranged at a top edge of the respective side wall.
(34) The road vehicle according to Claim 6 wherein the inner sheet includes a portion thereof extending substantially vertically and wherein the outer sheet includes a horizontal portion attached to a top edge of the inner sheet and extending outwardly therefrom to define said box section at a top edge of the inner sheet.
(35) The road vehicle according to Claim 34 wherein the outer sheet includes a second outwardly extending portion spaced downwardly of the box section at the top edge to define a second side beam spaced downwardly of the box section at the top edge.
(36) The road vehicle according to Claim 27 wherein said beam means comprises a pair of upstanding beams, each connected at a lower end thereof to a respective one of the longitudinal beams and extending generally upwardly therefrom to said connecting means at a height above said longitudinal beams.
(37) The road vehicle according to Claim 36 wherein each of the upright beams is inclined inwardly from the longitudinal beam to said connecting means such that the spacing between the upright beams at the connecting means is reduced relative to the spacing at the longitudinal beams.
(38) The road vehicle according to Claim 36 or 37 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams.
(39) The road vehicle according to Claim 36 or 37 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams, and wherein the front end wall of the box is positioned inside said upright beams and is attached to
(2) The road vehicle according to Claim 1 wherein each of the longitudinal beams comprises a top horizontal flange, a bottom horizontal flange and a single vertical web extending therebetween.
(3) The road vehicle according to Claim 2 wherein the top flange has one edge thereof connected to a top edge of the web and extending inwardly therefrom and wherein the bottom flange has an inner edge thereof projecting inwardly from a bottom edge of the web, an outer edge thereof projecting outwardly from a bottom edge of the web and the bottom edge of the web connected to an intermediate line along the length of the bottom flange, the intermediate line being offset from a centre of the web toward the inner edge.
(4) The road vehicle according to Claim 1, 2 or 3 wherein an intermediate portion of each of the beams along the length of the respective beam is increased in height.
(5) The road vehicle according to Claim 1 wherein each of the side beam means comprises a closed box section.
(6) The road vehicle according to Claim wherein each of the side beam means is fabricated from an inner sheet and an outer sheet welded thereto, at least one of the inner and outer sheets being formed to define top and bottom walls of the box section.
(7) The road vehicle according to Claim wherein each of the side beam means is arranged at a top edge of the respective side wall.
(8) The road vehicle according to Claim 6 wherein the inner sheet includes a portion thereof extending substantially vertically and wherein the outer sheet includes a horizontal portion attached to a top edge of the inner sheet and extending outwardly therefrom to define said box section at a top edge of the inner sheet.
(9) The road vehicle according to Claim 8 wherein the outer sheet includes a second outwardly extending portion spaced downwardly of the box section at the top edge to define a second side beam spaced downwardly of the box section at the top edge.
(10) The road vehicle according to Claim 1 wherein said first beam means comprises a pair of upstanding beams, each connected at a lower end thereof to a respective one of the longitudinal beams and extending generally upwardly therefrom to said connecting means at a height above said longitudinal beams.
(11) The road vehicle according to Claim 10 wherein each of the upright beams is inclined inwardly from the longitudinal beam to said connecting means such that the spacing between the upright beams at the connecting means is reduced relative to the spacing at the longitudinal beams.
(12) The road vehicle according to Claim 10 or 11 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams.
(13) The road vehicle according to Claim 10 or 11 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams, and wherein the front end wall of the box is positioned inside said upright beams and is attached to said upright beams so as to be inclined forwardly and upwardly from a forward end of the longitudinal beams.
(14) A road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front end of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gats section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to receive the majority of the vertical loading of the box thereupon, beam means connected to said longitudinal beams for transmitting said loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, that portion of the floor between the front end and the rear end being substantially free of transversely extending structural ribs, and means on each of said side walls for preventing outward bowing of the side walls in response to force from the load.
(15) The road vehicle according to Claim 14 wherein each of the longitudinal beams comprises a top horizontal flange, a bottom horizontal flange and a single vertical web extending therebetween.
(16) The road vehicle according to Claim 15 wherein the top flange has one edge thereof connected to a top edge of the web and extending inwardly therefrom and wherein the bottom flange has an inner edge thereof projecting inwardly from a bottom edge of the web, an outer edge thereof projecting outwardly from a bottom edge of the web and the bottom edge of the web connected to an intermediate line along the length of the bottom flange, the intermediate line being offset from a centre of the web toward the inner edge.
(17) The road vehicle according to Claim 14, 15 or 16 wherein an intermediate portion of each of the beams along the length of the respective beam is increased in height.
(18) The road vehicle according to Claim 14 wherein said means on each of said side walls comprises side beam members defined by a closed box section.
(19) The road vehicle according to Claim 18 wherein each of the side beam means is fabricated from an inner sheet and an outer sheet welded thereto, at least one of the inner and outer sheets being formed to define top and bottom walls of the box section.
(20) The road vehicle according to Claim 18 wherein each of the side beam means is arranged at a top edge of the respective side wall.
(21) The road vehicle according to Claim 19 wherein the inner sheet includes a portion thereof extending substantially vertically and wherein the outer sheet includes a horizontal portion attached to a top edge of the inner sheet and extending outwardly therefrom to define said box section at a top edge of the inner sheet.
(22) The road vehicle according to Claim 21 wherein the outer sheet includes a second outwardly extending portion spaced downwardly of the box section at the top edge to define a second side beam spaced downwardly of the box section at the top edge.
(23) The road vehicle according to Claim 14 wherein said beam means comprises a pair of upstanding beams, each connected at a lower end thereof to a respective one of the longitudinal beams and extending generally upwardly therefrom to said connecting means at a height above said longitudinal beams.
(24) The road vehicle according to Claim 23 wherein each of the upright beams is inclined inwardly from the longitudinal beam to said connecting means such that the spacing between the upright beams at the connecting means is reduced relative to the spacing at the longitudinal beams.
(25) The road vehicle according to Claim 23 or 24 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams.
(26) The road vehicle according to Claim 23 or 24 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams, and wherein the front end wall of the box is positioned inside said upright beams and is attached to said upright beams so as to be inclined forwardly and upwardly from a forward end of the longitudinal beams.
(27) A road vehicle having a rear dump box, comprising a box for receiving and containing a load of a pourable solid material including a horizontal floor, two vertical side walls each extending along a respective side of the floor from a front end of the floor to a rear end of the floor, a front end wall at a front end of the box upstanding from the floor and connected to the side walls, a rear tail gate section of the box upstanding from the floor at the rear end of the box and connected across the side walls, the tail gate section including a portion thereof which can be opened to allow discharge therethrough of the pourable material from the box, a support assembly for the box including a ground wheel assembly arranged adjacent said rear end of the floor of the box for supporting the rear end, the ground wheel assembly having ground wheels for engaging the ground and frame means connected to the ground wheel assembly, the frame means including pivot mounting means for engaging the box adjacent said rear end for allowing pivotal movement of the box relative to the support assembly about a horizontal axis transverse to the length of the box such that the front end of the box can be raised relative to the rear end to cause said discharge of the pourable material, the support assembly further including a front support portion for engaging and supporting the box at the front end wall, the front support portion including jack means connected between the front support portion and the box at the front end wall of the box for raising the front end of the box to cause said discharge, the box including connecting means for engaging said jack means and receiving force therefrom for raising said front end, the improvement wherein the box comprises two longitudinal parallel beams extending from the front end of the box to the rear end of the box underneath the floor at a position spaced inwardly of the side walls and attached to the floor, the longitudinal beams being shaped and arranged to constitute the main longitudinal structural members of the box, beam means connected to said longitudinal beams for transmitting loading from the longitudinal beams to said connecting means such that force from the jack when raising the front end of the box is transmitted to said longitudinal beams, two side beam means each arranged longitudinally along a respective one of the side walls at a position thereon spaced upwardly of the floor, the floor being formed and arranged such that forces thereon from the load are primarily applied to said longitudinal beams and being substantially free from transverse structural members transmitting forces transversely to said side walls.
(28) The road vehicle according to Claim 27 wherein each of the longitudinal beams comprises a top horizontal flange, a bottom horizontal flange and a single vertical web extending therebetween.
(29) The road vehicle according to Claim 28 wherein the top flange has one edge thereof connected to a top edge of the web and extends inwardly therefrom and wherein the bottom flange has an inner edge thereof projecting inwardly from a bottom edge of the web, an outer edge thereof projecting outwardly from a bottom edge of the web and the bottom edge of the web connected to an intermediate line along the length of the bottom flange, the intermediate line being offset from a centre of the web toward the inner edge.
(30) The road vehicle according to Claim 27, 28 or 29 wherein an intermediate portion of each of the beams along the length of the respective beam is increased in height.
(31) The road vehicle according to Claim 27 wherein each of the side beam means comprises a closed box section.
(32) The road vehicle according to Claim 31 wherein each of the side beam means is fabricated from an inner sheet and an outer sheet welded thereto, at least one of the inner and outer sheets being formed to define top and bottom walls of the box section.
(33) The road vehicle according to Claim 27 wherein each of the side beam means is arranged at a top edge of the respective side wall.
(34) The road vehicle according to Claim 6 wherein the inner sheet includes a portion thereof extending substantially vertically and wherein the outer sheet includes a horizontal portion attached to a top edge of the inner sheet and extending outwardly therefrom to define said box section at a top edge of the inner sheet.
(35) The road vehicle according to Claim 34 wherein the outer sheet includes a second outwardly extending portion spaced downwardly of the box section at the top edge to define a second side beam spaced downwardly of the box section at the top edge.
(36) The road vehicle according to Claim 27 wherein said beam means comprises a pair of upstanding beams, each connected at a lower end thereof to a respective one of the longitudinal beams and extending generally upwardly therefrom to said connecting means at a height above said longitudinal beams.
(37) The road vehicle according to Claim 36 wherein each of the upright beams is inclined inwardly from the longitudinal beam to said connecting means such that the spacing between the upright beams at the connecting means is reduced relative to the spacing at the longitudinal beams.
(38) The road vehicle according to Claim 36 or 37 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams.
(39) The road vehicle according to Claim 36 or 37 wherein each of the upright beams is inclined upwardly and forwardly of the box such that the connecting means is located at a position spaced upwardly and forwardly of a forward end of the longitudinal beams, and wherein the front end wall of the box is positioned inside said upright beams and is attached to
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2058661 CA2058661A1 (en) | 1991-12-31 | 1991-12-31 | Road vehicle having a rear dump box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2058661 CA2058661A1 (en) | 1991-12-31 | 1991-12-31 | Road vehicle having a rear dump box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2058661A1 true CA2058661A1 (en) | 1992-03-31 |
Family
ID=4149016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2058661 Abandoned CA2058661A1 (en) | 1991-12-31 | 1991-12-31 | Road vehicle having a rear dump box |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2058661A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5480214A (en) * | 1994-10-20 | 1996-01-02 | Rogers; Ralph R. | Side dump trailer |
| US5681095A (en) * | 1996-01-03 | 1997-10-28 | Diesel Equipment Limited | Dump body for a vehicle |
| AU698505B2 (en) * | 1990-09-03 | 1998-10-29 | Bhp Australia Coal Pty Ltd | Suspension system & body for large dump trucks |
| US6056368A (en) * | 1999-02-02 | 2000-05-02 | Circle R, Inc. | Side dump body having an increased carrying capacity |
| US6089670A (en) * | 1999-02-10 | 2000-07-18 | Ralph R. Rogers | Detachable side dump body |
| US7992942B2 (en) | 2008-06-02 | 2011-08-09 | Heider Dale J | Dump device for side dump trailer |
| CN106672087A (en) * | 2016-12-26 | 2017-05-17 | 苏州奥杰汽车工业有限公司 | Aluminum alloy light composite frame type carriage structure |
-
1991
- 1991-12-31 CA CA 2058661 patent/CA2058661A1/en not_active Abandoned
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU698505B2 (en) * | 1990-09-03 | 1998-10-29 | Bhp Australia Coal Pty Ltd | Suspension system & body for large dump trucks |
| US5480214A (en) * | 1994-10-20 | 1996-01-02 | Rogers; Ralph R. | Side dump trailer |
| US5681095A (en) * | 1996-01-03 | 1997-10-28 | Diesel Equipment Limited | Dump body for a vehicle |
| US6056368A (en) * | 1999-02-02 | 2000-05-02 | Circle R, Inc. | Side dump body having an increased carrying capacity |
| US6089670A (en) * | 1999-02-10 | 2000-07-18 | Ralph R. Rogers | Detachable side dump body |
| US7992942B2 (en) | 2008-06-02 | 2011-08-09 | Heider Dale J | Dump device for side dump trailer |
| US8220874B2 (en) | 2008-06-02 | 2012-07-17 | Jet Co. | Dump device for side dump trailer |
| CN106672087A (en) * | 2016-12-26 | 2017-05-17 | 苏州奥杰汽车工业有限公司 | Aluminum alloy light composite frame type carriage structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |