Abstract:
An earthmoving scraping device has a bowl-shaped frame with walls and a frame floor that define an interior for transporting material and a walking beam system for the rear wheels thereof that includes a suspension arm pivotally connected between the back end of the frame and a beam, the beam having first and second axles disposed in parallel orientation on separate sides of the beam. The scraping device may have two walking beams independently connected to the rear end of the frame, each having a cylinder connecting the back of the frame and the suspension arm. The first axles of the beam may extend outward to position the outer tires closest to the frame, the inner axles and associated tires being positioned furthest from the frame between the two walking beams.

Description:
[0001]    This is a continuation of application Ser. No. 11/906,472, filed Oct. 2, 2007, the entire contents of which are hereby incorporated by reference. 
     
    
     TECHNICAL FIELD  
       [0002]    The present disclosure relates generally to a scraping device and, more particularly, to a walking beam system for a scraping device. 
       BACKGROUND  
       [0003]    The present invention generally relates to a walking beam system, a tire system and a method for using the walking beam system and the tire system. The walking beam system and the tire system may be attached to an earthmoving scraping device and may allow the earthmoving scraping device to travel over various types of surfaces. The walking beam system, the tire system, and the method for using the walking beam system and the tire system may have a central beam, one or more axles, and two forks having bearings. The central beam may transversely support a load of the earthmoving scraping device. One or more tires may be attached to the axles of the central beam. As a result, the walking beam system may provide stability, may allow the attached earthmoving scraping device to smoothly travel over irregularities in a road, and/or may provide increased ground clearance. 
         [0004]    The walking beam system, the tire system and the method for using the walking beam system and tire system may include a rim. The rim may attach to multiple mounted plates wherein each mounted plate is separated from adjacent mounted plates by a distance. The mounted plates of the tire may contain rubber tracks which may be connected, mounted, and/or laminated to the mounted plates. The mounted plates of the tire may be removably attached to the rim, and the rubber tracks may be removably attached to the mounted plates. Each rubber track of the tire may be removed and replaced upon being damaged. As a result, quick and/or efficient removal of damaged tires and minimized costs associated with fixing a damaged tire as well as work delay associated with fixing the damaged tire may result. 
         [0005]    Earthmoving generally involves breaking up the soil of the construction area. The soil may be used in the existing project and/or hauled away to a remote site. Like other construction projects, highway construction often requires an earthmoving step. To ensure safe and smooth roads, soil must be broken down and removed before paving of a roadway begins. 
         [0006]    Highway systems are vital parts of any economy. Highways allow goods to be transported across the country and around the world. Furthermore, the travel of cars, trucks and other vehicles provides economic stimulus to areas they pass through. Given such importance, building roads and maintaining existing ones is undertaken by national governments and local municipalities throughout the world. 
         [0007]    Removal of earth materials is performed by several different machines with the decision regarding use of specific machinery determined by the type of project. Several factors to be considered are the type of material to be removed, removal distance and the ultimate plans for the materials. Choosing the proper machine factors significantly into the final costs of the project. Using the wrong equipment for a project results in delays that lead to inefficient expenditure of labor and/or money. As a result, the process of removing earth materials may result in an economic burden to the overall cost of the project. Therefore, construction projects require use of the proper equipment as well as efficient and successful performance of the equipment. 
         [0008]    Typically, earthmoving equipment, such as scrapers, may carry large volumes of materials. Scrapers may be towed or self-propelled. One such scraper has a frame shaped like a bowl and a lip that serves as a wall to prevent soil or other materials from leaving the bowl. To aid in removal and containment of materials, the lip may be attached to a cylinder which raises or lowers the lip. A blade is attached near the bottom of the bowl and below the lip. As the scraper is moved across an area of soil to be broken, the blade of the scraper may press into the soil, and the soil may be collected within the bowl. The lip is lowered to prevent the material from exiting the bowl during transport of the bowl to another area. After the soil is transported to a desired location, the collected material may be deposited by raising the lip to provide an open area to allow removal of the material from the scraper. 
         [0009]    Many different types of scrapers have been built, including pull-scrapers, motor scrapers, twin-engine scrapers, paddle wheel scrapers, and auger scrapers. Transportation of the loads of these scrapers has always been subject to inefficient delays because many models include rudimentary tire systems that allow road irregularities to impede travel. In addition, commonly known tire systems are prone to damage that necessitates repair before further scraper use. As a result, a need exists for a scraper that also has more efficient and/or consistent scraper operation. 
         [0010]    Many scrapers have areas that become worn and are costly for the user to maintain and/or to repair. One of these areas is the axle and tire area. Due to the rough terrain and heavy loads carried by the scraper, the tires and the axles may be subject to extensive wear. Sunken tracks or grooves in the road may form as construction machines travel along unpaved roads. The sunken tracks may inflict tire or axle damage or cause scrapers to get stuck in the channels. It may be difficult to remove the heavy, material-filled scrapers after the same becomes stuck. A stuck scraper may cause efficiency problems because the project is delayed, and construction ceases until the scraper is unloaded and freed from the rut. Furthermore, the unevenness of the roads causes these machines to vibrate. Vibration causes greater stress on the roadways, which further exacerbates the formation of road grooves. Vibration transmitted through rigid tire systems stresses the frame of the machinery which increases the likelihood of structural damage that necessitates repair. 
         [0011]    Grooves or channels formed in the roads often results in lower productivity as tire damage becomes a greater possibility. Uneven roads and the channels that form as a result cause cuts, punctures, snags, tears, or complete tire blowouts. Flat or damaged tires can hinder completing a project within budget, particularly if tire damage occurs frequently or at a remote distance construction site. 
         [0012]    Therefore, tire selection and maintenance plays an important role because productivity and/or payload unit costs depend on reliable and cost effective performance. Furthermore, improper tire inflation places additional stress on the tire system of the machine, resulting in tire damage. Since large scraper tires are difficult to replace, damaged tires may slow down the progress of any project that may result in project stoppage until a new tire is found or a new machine is secured. In either case, damaged tires often result in slowed work that increases the likelihood of cost over-runs. 
         [0013]    The type of topography and/or soil scraped affects the overall performance of scrapers. Scrapers are inefficient in moist, rough, and/or rocky terrain. Rough terrain and bad weather may further strain the tires of the scraper and/or may require additional maintenance. When scraping earth materials in those environments, scrapers often need help from other machines to make full contact with the ground. Furthermore, certain topography and grades of land do not allow for efficient use of the scraper that causes problems related to clearance issues. 
         [0014]    A need, therefore, exists for a walking beam system, a tire system and a method for using the walking beam system and the tire system that allow earthmoving equipment to function in a reliable and/or efficient manner in collection and/or removal of materials. 
       SUMMARY  
       [0015]    The present invention generally relates to a walking beam system, a tire system and a method for using the walking beam system and the tire system. More specifically, the present invention relates to a walking beam system, a tire system and a method for using the walking beam system and the tire system which may contain a beam system for providing stability and ground clearance. The beam system may have a central beam transversely supporting a load. The central beam may have one or more axles in a parallel spaced relation. The axles may be on opposite sides of the central beam. The axles may connect one or more tires to the central beam. The walking beam system may also have one or more forks with bearings that attach the central beam to the device to be moved. 
         [0016]    The present invention relates to a tire system and a method for using the tire system to engage a surface with at least one tire to provide movement for an attached earthmoving machine. The tire system may have a rim with one or more mounted plates attached to the rim. The mounted plates may be removable and may be connected and/or bolted to the rim by a fastening device. The mounted plates may be separated from each other by a defined distance. The rim of the tire may be made from a material such as, for example, steel. 
         [0017]    Furthermore, the mounted plates may have rubber tracks attached to the mounted plates. Each rubber track may fit to the same dimensions as that of the associated mounted plate. Furthermore, each individual rubber track may form a determined portion of the total circumference of the tire. 
         [0018]    The walking beam system and/or the tire system may be attached to a scraping device containing a frame having a first end and a second end. The scraping device may have a front wall and back wall attached to the frame that may create an open-air, bowl-shaped interior. The scraping device may also have a lip pivotally attached to the first end. An ejecting mechanism may be provided to remove collected materials. The scraper may have a blade attached to the bottom of the frame. As the scraper moves across the ground, the blade may chop the surface and/or may push the materials into the bowl. 
         [0019]    In an embodiment of the present invention, a scraping device is provided. The scraping device has a frame having walls defining an interior and further having a length defined between a first end and a second end wherein the second end is in a position opposite to the first end wherein opposing walls of the frame connect the first end to the second end of the frame; and a suspension arm having a first fork wherein the first fork has at least two prongs projecting from the first fork; a beam having a front end, a back end in a position opposite to the front end, a first side, a second side in a position opposite to the first side and a first pivot between the front end and the back end wherein the first pivot is connected to the first fork to allow the beam to rotate relative to the first fork. The scraping device has a first axle attached to the front end of the beam on the first side of the beam; and a second axle attached to the back end of the beam on the second side of the beam wherein the second axle is parallel to the first axle. 
         [0020]    In an embodiment, the scraping device has a second fork having at least two prongs projecting from the second fork wherein the first fork attaches to the first side of the beam and the second fork attaches to the second side of the beam. 
         [0021]    In an embodiment, the scraping device has a cylinder that connects the suspension arm to the frame wherein the cylinder provides movement of the suspension arm relative to the ground independent of movement of the frame. 
         [0022]    In an embodiment, the scraping device has a second pivot that connects the suspension arm to the frame and allows vertical rotation of the suspension arm relative to the frame. 
         [0023]    In an embodiment, the scraping device has a blade attached to the frame wherein the blade projects from a bottom of the frame. 
         [0024]    In an embodiment, the scraping device has a plurality of tires connected to the frame wherein a first tire of the plurality of tires resides on the first axle and extends in a direction rearward past the second end of the beam and a second tire of the plurality of tires resides on the second axle and extends in a direction forward past the first end of the beam. 
         [0025]    In another embodiment, a tire system for moving a scraping device is provided. The tire system has a rim; a plurality of mounted plates radially connected to the rim wherein each of the plurality of mounted plates is separated from adjacent ones of the plurality of mounted plates by a defined distance wherein the plurality of mounted plates form a circumference wherein each one of the plurality of mounted plates forms a defined portion of the circumference; a fastener that connects the rim to the mounted plates; and a plurality of rubber tracks connected to the plurality of mounted plates. 
         [0026]    In an embodiment, each one of the plurality of rubber tracks is laminated onto one of the mounted plates. 
         [0027]    In an embodiment, the plurality of rubber tracks conforms to sizes of the mounted plates. 
         [0028]    In an embodiment, the mounted plates are identical. 
         [0029]    In an embodiment, the defined portion of the circumference is the same for each one of the mounted plates. 
         [0030]    In an embodiment, the plurality of rubber tracks is removably connected to the plurality of mounted plates so that one of the plurality of rubber tracks is removable by a user and replaceable with a substitute track. 
         [0031]    In an embodiment, each one of the plurality of mounted plates has only one rubber track attached. 
         [0032]    In an embodiment, the plurality of mounted plates are removably connected to the rim so one of the plurality of mounted plates is removable from the rim and replaceable with a substitute plate. 
         [0033]    In an embodiment, the tire system has an axle rotatably attached to the rim. 
         [0034]    In another embodiment, a method for collecting a material from a ground surface is provided. The method for collecting a material from a ground surface comprises the steps of providing a scraping device having a frame having walls defining an interior wherein the walls have an interior surface and the frame has a length defined between a first end and a second end further wherein a first opening exists at the first end and wherein the scraping device has a lip connected to the first end of the frame which is raised to uncover the opening at the first end; connecting a beam to the scraping device so that the beam vertically rotates with respect to the ground surface; connecting two axles to the beam so that each axle is located on a different side of the beam and further wherein each axle resides adjacent to a different end of the beam; attaching a tire to each axle wherein each tire has a rim and a plurality of mounted plates radially connected to the rim, wherein each one of the plurality of mounted plates is separated from an adjacent one of the plurality of mounted plates by a defined distance wherein each one of the plurality of mounted plates forms a defined portion of a circumference of the tire; and attaching rubber tracks to the plurality of mounted plates. 
         [0035]    In an embodiment, a method for collecting a material from a ground surface is provided further comprising the step of attaching a blade to the scraping device. 
         [0036]    In an embodiment, a method for collecting a material from a ground surface is provided further comprising the step of moving a plate positioned at the second end of the frame toward the first end of the frame to force the material through the opening in the first end. 
         [0037]    In an embodiment, a method for collecting a material from a ground surface is provided further comprising the step of removing one of the rubber tracks from the mounted plates and replacing the one rubber track with a substitute track. 
         [0038]    In an embodiment, a method for collecting a material from a ground surface is provided further comprising the step of removing one of the plurality of mounted plates from the rim and replacing the one of the plurality of mounted plates with a substitute plate. 
         [0039]    It is, therefore, an advantage of the present invention to provide a walking beam system, a tire system and a method for using the walking beam system and the tire system which may provide an earthmoving device with efficient travel over various topographies, including topographies that have irregularities in the ground surface, reducing the risk of delays associated with damage to the machine and attached tires. 
         [0040]    Another advantage of the present invention is to provide a walking beam system, a tire system and a method for using the walking beam system and the tire system which may have one or more axles allowing one or more tires to be connected to the axles which provide movement, support and/or spacing between the tires needed for around clearance. 
         [0041]    A further advantage of the present invention is to provide a walking beam system, a tire system and a method for using the walking beam system and the tire system which may have removable fasteners for attaching the mounted plates to the rim. 
         [0042]    Yet another advantage of the present invention is to provide a tire that may regain functionality by the replacement of one component rather than replacing the entire tire. 
         [0043]    A still further advantage of the present invention is to provide a walking beam system, a tire system and a method for using the walking beam system and the tire system that provides stability to an earthmoving device relative to an attachment between a frame and a tire. 
         [0044]    Another advantage of the present invention is to provide a walking beam system, a tire system and a method for using the walking beam system and the tire system that allows an earth moving device to have increased ground clearance so that heightened areas in a road do not interrupt travel of the device. 
         [0045]    Further, an advantage of the present invention is to provide a walking beam system, a tire system and a method for using the walking beam system and the tire system which may have one or more tires containing multiple, removably mounted plates attached to a rim providing a system for an airless tire which eliminates the possibility of a flat tire. 
         [0046]    Additional features and advantages of the present invention are described in, and will be apparent from, the detailed description of the presently preferred embodiments and from the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0047]      FIG. 1  illustrates a side view of the earth moving scraping device in an embodiment of the invention. 
           [0048]      FIG. 2  illustrates a perspective view of the earth moving scraping device in an embodiment of the invention. 
           [0049]      FIG. 3A  illustrates a perspective view of the walking beam system in an embodiment of the present invention. 
           [0050]      FIG. 3B  illustrates an overhead view of the walking beam system in an embodiment of the present invention. 
           [0051]      FIGS. 4A and 4B  illustrate side views of the walking beam system in an embodiment of the present invention that includes a suspension arm. 
           [0052]      FIGS. 5A ,  5 B and  5 C illustrate side views of the walking beam system in an embodiment of the present invention. 
           [0053]      FIG. 6  illustrates an overhead view of an earth moving scraping device that includes two beam systems and multiple tires attached in an embodiment of the present invention. 
           [0054]      FIG. 7  illustrates a side view of the tire system in an embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION  
       [0055]    The present invention generally relates to a walking beam system, a tire system and a method for using the walking beam system and the tire system. The walking beam system  100  may have a central beam  102  having a first end  103  and a second end  104 . The central beam  102  may transversely support a load of an earthmoving scraping device  1 . A first axle  106  may be attached to the central beam  102  at the first end  103  and a second axle  107  may be attached to the central beam  102  at the second end  104 . 
         [0056]    Referring now to the drawings wherein like numerals refer to like parts,  FIG. 1  illustrates a scraping device  1  for which the walking beam system  100  and the tire system  200  may provide movement and/or stability. The scraping device  1  may have a bowl-shaped frame  2  having a floor  17  and walls  13  defining an interior  3  into which materials may be collected and/or transported. A blade  10 , which may allow soil to be broken apart by the scraping device  1 , may be attached to the frame  2  at front end  22  along an edge of floor  17 . Adjacent to the blade  10  may be a router bit  82  which may assist in cutting into materials and may prevent the materials from causing wear to the scraping device  1 . 
         [0057]      FIG. 2  illustrates an elevated view of the frame  2 . A lip  20  may be attached to the frame  2  at a front end  22  of the frame  2 . The size of the lip  20  may prevent materials within the frame  2  from falling from an opening (not shown) at the end  22  of the frame  2 . The lip  20  may be pivotally connected to the frame  2  at points  29   a,    29   b  on the sides  28 ,  30 , respectively, of the lip  20 . Cylinders  24 ,  26  may be attached to the lip  20  on the sides  28 ,  30  at points  63   a,    63   b.  The cylinders  24 ,  26  may be partially shielded by flaps  55  that may be attached to the lip  20 . The cylinders  24 ,  26  may be attached to the frame  2  at the front end  22  of the frame  2 . 
         [0058]    An ejector plate  36  may be positioned at a back end  38  of the frame  2 . In addition, a guard  7  may be attached to, or integrally formed with, the ejector plate  36 . The guard  7  may be a planar wall and may extend vertically from the ejector plate  36 . Further, the guard  7  may prevent materials accumulated within the frame  2  from falling behind the ejector plate  36 . The ejector plate  36  may move toward, or away from, the lip  20 . As the ejector plate  36  moves forward, the materials within the frame  2  may be pushed by the ejector plate  36  through the opening within the frame  2 . 
         [0059]    The frame  2  may be connected to a hitch  4  by a tongue  57 . The hitch  4  may allow the scraping device  1  to be connected to a tractor (not shown) or other vehicle. The tractor may pull the scraping device  1  along an area, such as, for example, an area of grass or soil to be broken and/or collected. Tires  80  may be associated with the scraping device  1  to enable the scraping device  1  to be transported. 
         [0060]    As illustrated in  FIGS. 3A and 3B , the walking beam system  100  may have a central beam  102  with a first end  103  and a second end  104 . The central beam  102  may be connected to an earthmoving scraping device  1  to transversely support a load of the device  1 . A first axle  106  may attach to the first end  103  of the central beam  102 . A second axle  107  may attach to the second end  104  of the central beam  102  so that the pivot  115  may be located between the first axle  106  and the second axle  107 . The first axle  106  may attach to a first side  116  of the central beam  102 . The second axle  107  may attach to a second side  117  of the central beam  102  opposite in position to the first side  116  of the central beam  102 . The first axle  106  may be separated from the second axle  107  by a distance  111 . Multiple axles may be attached to the central beam  102  and may allow multiple tires (not shown) to connect to the central beam  102 . At the pivot  115 , a first pivot shaft  118  and a second pivot shaft  120  may extend from the central beam  102 . 
         [0061]    As illustrated in  FIG. 4A , a suspension arm  150  may connect the central beam  102  to the scraping device  1 . The suspension arm may have a first (front) end  158  that is pivotally connected at second pivot  152  to rear end  38  of frame  2 , and a second (back) end  160  that is pivotally connected to the beam  102 . As shown, the suspension arm  150  may provide a non-linear connection between pivot point  152  and pivot  115 . For example, as shown, the suspension arm  150  may have a first portion  168  connected to the rear end of the frame  38  and a second portion  170  that extends downward from the first portion  168 , forming an angle  166 . The first portion  168  and second portion  170  of the suspension arm may be disposed perpendicular to each other, wherein angle  166 , as shown, is a 90 degree angle. 
         [0062]    A first tire  109  may be rotatably connected to the central beam  102  via the first axle  106 , and a second tire  110  may be rotatably connected to the central beam  102  via the second axle  107 . The suspension arm  150  may have a first fork  112  and/or a second fork (not shown). The first fork  112  and/or the second fork  113  may contain bearings (not shown). The first fork  112  and the second fork may connect to the central beam  102  at a first pivot  115  on the central beam  102 . The first fork  112  may connect to the central beam  102  on the first side  116  of the central beam  102 , and the second fork may connect to the central beam  102  on the second side  117  of the central beam  102 . The first pivot shaft  118  may project from the first side  116  of the central beam  102  and may insert between prongs  119  of the first fork  112 , and the second pivot shaft  120  may project from the second side  117  of the central beam  102  and may insert between prongs of the second fork. The second fork may be parallel to the first fork  112 , and the forks may be perpendicular to the axles  106 ,  107 . Alternatively, only one fork may be used to connect the central beam  102  to the frame  2  of the scraping device  1 . 
         [0063]    Referring again to  FIGS. 3A and 3B , the distance  111  between the first axle  106  and the second axle  107  may be small relative to the size of the tires  109 ,  110 . The first tire  109  may extend rearward toward the second end  104  of the central beam  102  past the first pivot  115 . The second tire  110  may extend forward toward the first end  104  of the central beam  102  past the first pivot  115 . Preferably, the distance  11  may be such that the first tire  109  extends rearward to a point past the second end  104  of the central beam  102 , and the second tire  110  extends forward to a point past the first end  103  of the central beam  102 . In a preferred embodiment, the distance  111  between the first axle  106  and the second axle  107  is approximately one foot. However, the distance  111  may be from approximately one inch to approximately four feet. 
         [0064]    As illustrated in  FIG. 4A , the suspension arm  150  may be connected to back end  38  of frame  2  of the scraping device  1  by a cylinder  151 . A first end  162  of the cylinder being connected to the back end  38  of the frame, and a second end  164  of the cylinder being connected to the suspension arm  150 . In one embodiment, the second end of  164  of the cylinder may be connected to a pivot disposed on an upper surface  174  of the first portion  168  of the suspension arm  150 . If the central beam  102  moves, such as, for example, during travel over irregularities in a road, the cylinder  151  may allow the suspension arm  150  to move without transmitting vibrations from the suspension arm  150  to the frame  2  of the scraping device  1 . Because the cylinder  151  may lessen vibrations of the frame  2  of the scraping device  1 , the cylinder  151  may provide smooth travel. By keeping the frame  2  of the scraping device  1  at a consistent position relative to the ground, the angle of the blade  10  of the scraping device  1  may be maintained at a consistent angle. 
         [0065]    The suspension arm  150  may rotate vertically relative to the ground. In a preferred embodiment, the suspension arm  150  may be rotatably attached to back end  38  of frame  2  of the scraping device  1  at a second pivot  152 . For example, the suspension arm  150  may rotate in a position upward in response to upward movement of the central beam  102  that may be caused by a road irregularity, as illustrated in  FIGS. 4A and 4B . The rotation of the suspension arm  150  in response to the upward movement of the central beam  102  may preclude vertical movement from being transmitted to the frame  2 . The cylinder  151  may further absorb vertical movement if the suspension arm  150  rotates. Therefore, the suspension arm  150  of the walking beam system  102  may maintain the scraping device  1  at a consistent position relative to the ground and may provide smooth travel for the scraping device  1 . 
         [0066]    The central beam  102  may rotate vertically relative to the ground at the first pivot  115  while the pivot shafts  118 ,  120  are held between the first fork  112  and the second fork (not shown). For example, the central beam  102  may rotate in response to irregularities in the road that may cause vertical movement of the first tire  9  upwards and vertical movement of the second tire  10  in a direction downward. If the central beam  102  is connected to the frame  2  of the scraping device  1 , the rotation of the central beam  102  in response to the road irregularities may preclude vertical movement being transmitted from the tires  109 ,  110  to the frame  2  of the scraping device  1 . Therefore, the walking beam system  2  may maintain the scraping device  100  at a generally consistent height despite road irregularities, such as bumps or divots. As a result, smooth travel is provided by maintaining clearance below the device and/or by maintaining an angle of the blade  10 . 
         [0067]    For example, as illustrated in  FIGS. 5A and 5B , as the scraping device  1  travels over an irregularity  145  in the road, such as a bump or mound of material, the first tire  109  may rotate vertically upward relative to the frame  2  to traverse the irregularity. As a result, the first end  103  of the central beam  102  may also rotate vertically upward relative to the frame  2 , as illustrated in  4 A and  4 B. Correspondingly, the second tire  110  and the second end  104  of the central beam  102  may rotate in a direction vertically downward relative to the frame  2 . As the first tire  109  traverses the heightened irregularity  145 , the first tire  109  and the first end  103  of the beam may rotate in a direction vertically downward relative to the frame  2 . Because the tires  109 ,  110  may move vertically in response to the bump without moving the frame  2  of the scraping device  1 , the scraping device  1  may maintain a generally consistent distance  140  from the road and/or may smoothly travel the road without transfer of stress and/or vibration. 
         [0068]    If the scraping device  1  travels across a depression  146  in the road, such as a divot or a pothole, the first tire  109  may rotate in a direction vertically downward relative to the frame  2  to traverse the road depression. As a result, the first end  103  of the central beam  102  may rotate in a direction vertically downward relative to the frame  2 , as illustrated in  FIGS. 5A and 5C . Correspondingly, the second tire  110  and the second end  6  of the central beam may rotate vertically upward relative to the frame  2 . As the first tire  109  traverses the depression  146  in the road, the first tire  109  and the first end  103  of the beam may rotate in a direction vertically upward relative to the frame  2 . Because the tires  109 ,  110  may move in a direction vertically in response to the depression  146 , the scraping device  1  may maintain the generally consistent distance  140  from the road and thus traverse irregularities in the road. 
         [0069]    In addition, vertical movement of the first tire  109  and/or the second tire  110  may cause the suspension arm  150  to rotate at the second pivot  152 , as illustrated in  FIGS. 4A and 4B . Rotation of the suspension arm  150  may further prevent vertical movement of the tires  109 ,  110  from being transmitted to the frame  2  of the scraping device  1 . The cylinder  151  may absorb shock and may allow the suspension arm  150  to rotate without transfer of the movement of the suspension arm  150  to the frame  2  of the scraping device  1 . Because the suspension arm  150  may move vertically in response to the road, the scraping device  1  may travel the road without transfer of stress and/or vibration to the frame  2 . 
         [0070]    In a preferred embodiment, two walking beam systems  100 ,  101  may be utilized, as illustrated in  FIG. 6 . The walking beam systems  100 ,  101  may be attached to a scraping device  1  so that the walking beam systems  100 ,  101  are adjacent one another. For example, the frame  2  of the scraping device  1  may have a left side  154  and a right side  156 . A first walking beam system  100  may reside near the left side  154  of the frame  2 , and a second walking beam system  101  may reside near the right side  156  of the frame  2 . The walking beams  100 , 101  may be disposed on opposing sides of longitudinal axis  15 , the first (front) axles  106  disposed at the first (front) end of the beam being proximate the back end  38  of the frame  2  and extending outwardly from the longitudinal axis  15  in opposite directions. Accordingly, rear (second) axles  107  extend inwardly, towards axis  15 . 
         [0071]    As shown, the walking beam systems  100 ,  101  are independently connected to the back end  38  of the frame  2  via their respective pivot points  152  such that the walking beams  100 , 101  may move independently of each other for a more level and smooth ride over adverse terrain. 
         [0072]      FIG. 7  illustrates a type of tire system  200 . The tire system  200  may be used to move earth moving equipment and/or may be connected to the walking beam system  100  as shown in  FIG. 2 . The tire system  200  may include a rim  202  and mounted plates  204   a - 204   h.  The rim  202  may be rotatably attached to an axle (not shown). The mounted plates  204   a - 204   h  may be attached, connected and/or bolted to the rim  202  by fasteners  206 . Rubber tracks  208   a - 208   h  may be connected, such as by lamination, to the mounted plates  204   a - 204   h.  The rubber tracks  208   a - 208   h  may conform to sizes and/or shapes of the mounted plates  204   a - 204   h.  Alternatively, only one rubber track may be connected to the mounted plates  204   a - 204   h.  The mounted plates  204   a - 204   h  may be separated from each other by defined distances  210   a - 210 h. In an embodiment, the defined distances  210   a - 210   h  may each be less than one inch. In another embodiment, the defined distances  210   a - 210   h  may be equal. In a preferred embodiment, the defined distances  210   a - 210   h  may each be approximately ⅛ of one inch. 
         [0073]    The mounted plates  204   a - 204   h  may form a circumference. In a preferred embodiment, the circumference is circular. Each of the mounted plates  204   a - 204   h  may form a portion of the circumference. In an embodiment, each of the mounted plates  204   a - 204   h  may form an equal portion of the circumference. For example, an embodiment having five mounted plates (not shown) may have the mounted plates  204   a - 204   h  that are each about 20% of the circumference. 
         [0074]    The tire system  200  may allow an attached scraping device  1  to travel the road by contacting the road with the rubber tracks  208   a - 208   h.  As the rim  202  rotates, each of the rubber tracks  208   a - 208   h  successively contacts the road. For example, as the rim  202  rotates, a first rubber track  208   a  may contact the road, subsequently a second rubber track  208   b  may contact the road, and so on, to allow the rotation of the tire system  200  and/or to provide movement to the scraping device  1 . 
         [0075]    The tire system  200  may be used with the walking beam system  100  and the scraping device  1  to provide stability, ground clearance, and movement to the scraping device  1 . Movement may be provided by the tire system  200  which may be the first tire  109  and/or the second tire  110  that may be mounted in the walking beam system  100 . 
         [0076]    It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages.