Abstract:
An earthmoving scraping device including a bowl-shaped frame having a front end, a back end, and opposing first and second side walls extending upwardly from a floor. The first side wall, the second side wall, and the floor define an interior of the frame for transporting material over a surface. A mechanism is configured for adjusting the frame to change the height of the frame relative to the surface. A push block is mounted adjacent the back end of the frame and includes a bumper. A linkage system pivotally connects the push block to the back end of the frame and is configured to maintain a consistent height of the push block from the surface when the mechanism adjusts the frame to change the height of the frame relative to the surface.

Description:
This is a continuation of application Ser. No. 11/977,367, filed Oct. 24, 2007, the entire contents of which are hereby incorporated by reference. 

   TECHNICAL FIELD 
   The present disclosure relates generally to a scraping device and, more particularly, to a push block for a scraping device. 
   BACKGROUND 
   The present invention generally relate to a push block, a scraping device and a method for collecting a material. The push block may be attached to an earthmoving scraping device and may allow the push block to maintain a clearance from the ground. The push block may have a bumper that transmits force to a frame of an attached scraping device. As a result, the push block may provide a mechanism that allows a scraping device to receive force from contact by an additional vehicle despite variations in ground clearance of the scraping device. 
   Earthmoving generally involves breaking apart soil of a construction area. The soil may be used in the existing project and/or hauled to a remote site. Like other construction projects, highway construction often requires breaking apart the soil of the construction area. The soil must be broken apart and removed before paving of a roadway. An area must be pre-treated to create a surface that is suitable for paving. If the area to be paved has soil, the soil may be broken prior to compaction or other processes. The soil may also be collected and moved to a different location. 
   Highways allow goods to be transported and provide economic stimulus to areas through which cars, trucks and other vehicles travel. Given such importance, building roads and maintaining existing ones are undertaken by national governments and/or local municipalities. 
   Removal of earth materials is performed by several different machines. The use of specific machinery is determined by the type of project. Several factors to be considered are the type of material to be removed, the distance the material is to be transported and/or the plans for the use of the material. Choosing the machine factors significantly into the costs of the project. Using the wrong equipment for a project results in delays that lead to significant expenditure of labor and/or money. As a result, the process of removing earth materials may result in an economic burden to the cost of the project. Therefore, construction projects require use of the proper equipment as well as efficient and successful performance of the equipment. 
   Typically, earthmoving equipment, such as scrapers, may carry large volumes of materials. The 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 frame. 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 frame and below the lip. As the scraper is moved across an area of soil to be broken apart, the blade of the scraper may press into the area of the soil, and the soil may be collected within the frame. The lip may prevent the material from exiting the frame during transport of the frame to another area. After the frame is transported to a desired location, the collected material may be deposited by lowering the lip to provide an open area to allow removal of the material from the scraper. 
   Many different types of scrapers are known, such as 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 delays because travel of construction machines along unpaved roads may form road irregularities. The road irregularities, such as sunken tracks or grooves in the road, may cause scrapers to get stuck in the channels. It may be difficult to remove the heavy, material-filled scrapers after the same become stuck. A stuck scraper may cause efficiency problems because the project is delayed, and construction ceases until the scraper is unloaded and freed. Further delay may be incurred because many models have rudimentary push block systems that impede efficient removal of a stuck scraper. The rudimentary push block systems have an altered height of the bumper as a result of the scraping device being in a hole or on a bump, and thus, a height of the push block may not allow the other vehicle to push upon the push block. Therefore, continued scraper operation determines productivity of the scraping device. A stuck scraper that is not freed from the road irregularity that impedes travel may slow down the progress of any project, may cease progress of the project and/or may increase the likelihood of cost overruns. 
   Additionally, the rudimentary push block systems are fixedly attached to the frame of the scraping device so that raising or lowering of the frame to adjust ground clearance of the device also raises or lowers the bumper. Raising or lowering of the bumper may preclude an additional vehicle from contacting the bumper to exert force upon the scraping device. Therefore, scraping that requires additional force is hindered by the height of the bumper preventing contact by the additional vehicle. 
   A need, therefore, exists for a push block, a scraping device and a method for collecting a material that allow earthmoving equipment to function in a reliable and/or efficient manner in collection and/or removal of materials. 
   SUMMARY 
   The disclosure generally relates to a push block, a scraping device and a method for collecting a material. More specifically, the disclosure relates to a push block, a scraping device and a method for collecting a material wherein the push block extends rearward from the scraping device. The push block may have a bumper for transmitting force to the scraping device. The bumper may have a convex surface facing away from the scraping device that transmits force exerted on the push block by another vehicle to the scraping device. The push block may be pivotally attached to an upper arm that may be connected to a back end of a frame of the scraping device. The push block may be pivotally attached to a tire beam that may be connected to the back end of the frame of the scraping device. The tire beam and/or the upper arm may be pivotally connected to the back end of the frame of the scraping device. The tire beam may have one or more axles that connect one or more wheels to the tire beam. The wheels may engage a surface to provide movement for the attached scraping device. The bumper of the push block may maintain a consistent ground clearance for the push block despite changes in a position of the scraping device and changes in ground clearance of the frame of the scraping device. 
   The push block 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 a 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 frame. In addition, the scraper may have a rear lift mechanism and/or a front lift mechanism. 
   In an embodiment of the present invention a push block is provided. The push block has an arm having a length defined by a first end and a second end wherein the second end is in a position opposite to the first end; a tire beam having a length defined by a first end beam and a second end wherein the second end is in a position opposite to the first end of the tire beam; and a bumper connected to the arm and the tire beam wherein the bumper has an inner surface and an outer surface wherein the outer surface is in a position opposite to the inner surface. The push block has a first pivot on the arm wherein the first pivot on the arm connects the bumper to the second end of the arm; a second pivot on the arm wherein the second pivot on the arm is positioned at the first end of the arm; and a first pivot on the tire beam wherein the first pivot on the tire beam connects the bumper to the second end of the tire beam wherein the first pivot on the tire beam is positioned at a distance from the first pivot on the arm. The push block has a second pivot on the tire beam wherein the second pivot on the tire beam is positioned at the first end of the tire beam wherein the second pivot on the tire beam is positioned at a distance from the second pivot on the arm wherein the distance of the second pivot on the tire beam from the second pivot on the arm is equal to the distance of the first pivot on the tire beam from the first pivot on the arm wherein the second pivot on the tire beam is a distance from the first pivot on the tire beam wherein the distance of the second pivot on the tire beam from the first pivot on the tire beam is equal to the length of the arm. 
   In an embodiment, the push block has a plurality of pins wherein the first pivot on the arm, the first pivot on the tire beam, the second pivot on the arm and the second pivot on the tire beam each have one of the plurality of pins. 
   In an embodiment, the push block has a support that connects the bumper to the first pivot of the arm and the first pivot of the tire beam wherein the support has an inner surface that is connected to the arm and the tire beam and an outer surface that is attached to the inner surface of the bumper wherein the outer surface is in a position opposite to the inner surface. 
   In an embodiment, the push block has an upper surface on the bumper and a lower surface on the bumper wherein the lower surface is in a position opposite to the upper surface wherein the upper surface and the lower surface are substantially parallel. 
   In an embodiment, the push block has a tire connected to the tire beam. 
   In an embodiment, the push block has a cylinder connected to the tire beam and to a cylinder pivot adjacent to the second pivot of the arm wherein movement of the cylinder moves the tire beam from a first position relative to the cylinder pivot to a second position relative to the cylinder pivot wherein the first position is a different position than the second position. 
   In another embodiment, a method for collecting a material from a surface is provided. The method for collecting a material comprises the steps of providing a scraping device having a frame having walls defining an interior wherein the frame has a length defined between a front end and a back end wherein the back end is connected to a tire beam at a first lower pivot wherein the tire beam rotates relative to the back end of the frame wherein the back end of the frame is connected to an arm at a first upper pivot wherein the first upper pivot is positioned at a height above the first lower pivot wherein the arm is connected to a push block at a second upper pivot wherein the push block has a bumper wherein the second upper pivot is positioned at a distance from the first upper pivot wherein the push block transmits force from the bumper to the frame wherein the tire beam is connected to the push block at a second lower pivot wherein the second upper pivot is positioned at a height above the second lower pivot wherein the height of the first upper pivot above the first lower pivot is equal to the height of the second upper pivot above the second lower pivot wherein the second lower pivot is positioned at a distance from the first lower pivot wherein the distance of the second lower pivot from the first lower pivot is equal to the distance of the second upper pivot from the first upper pivot; contacting the push block with another vehicle; and moving the scraping device across the ground surface. 
   In an embodiment, a method for collecting a material is provided further comprising the step of moving a cylinder attached to the tire beam and to the back end of the frame wherein moving the cylinder adjusts a distance of the back end from the tire beam. 
   In an embodiment, a method for collecting a material is provided further comprising the step of moving a plate positioned in the interior from the back end to the front end to force the material from the frame. 
   In an embodiment a method for collecting a material is provided further comprising the step of raising a lip connected to the front end of the frame and extending above the frame wherein the lip is raised to allow material to be pushed from the frame. 
   In an embodiment a method for collecting a material is provided further comprising the step of moving the frame from a first position relative to the tire beam to a second position of the frame relative to the tire beam wherein the second position is a position different from the first position. 
   In an embodiment a method for collecting a material is provided further comprising the step of moving the push block from a first position relative to the back end to a second position relative to the back end wherein the second position is a position different from the first position wherein a distance of the push block from the ground surface is the same in the first position and the second position. 
   In another embodiment, a scraping device for scraping an area of soil 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. The scraping device has a tongue extending from the first end of the frame; and a tire beam connected to the second end of the frame at a first lower pivot wherein the frame is at a first vertical position relative to the tire beam. The scraping device has a push block connected to the tire beam at a second lower pivot wherein a first distance is defined by the first lower pivot and the second lower pivot wherein the push block has an outer surface wherein the outer surface is located in a position opposite to the first end of the frame; and connecting means attached to the second end of the frame at a first upper pivot wherein the connecting means is attached to the push block at a second upper pivot wherein a second distance is defined by the first upper pivot and the second upper pivot wherein the first distance is equal to the second distance wherein a third distance is defined by the first upper pivot and the first lower pivot wherein a fourth distance is defined by the second upper pivot and the second lower pivot wherein the third distance is equal to the fourth distance. 
   In an embodiment, the scraping device has a surface on the push block wherein the surface is convex relative to the push block and in a position opposite to the first end of the frame. 
   In an embodiment, the scraping device has pins that attach the connecting means to the first upper pivot and the second upper pivot. 
   In an embodiment, the scraping device has a support that connects the tire beam to the first lower pivot wherein rotation of the support relative to the back end of the frame moves the second end of the frame from a first distance from the tire beam to a second distance from the tire beam wherein the second distance is a distance different from the first distance. 
   In an embodiment, the scraping device has a cylinder connected to the second end of the frame and to the tire beam wherein movement of the cylinder adjusts a distance of the second end of the frame from the tire beam. 
   In an embodiment, the scraping device has a cylinder connected to the first end of the frame and to the tongue wherein the cylinder moves to adjust a distance of the first end of the frame from the tongue. 
   In an embodiment, the scraping device has an ejector plate positioned at the back end of the frame wherein moving the ejector plate in a direction toward the front end of the frame pushes material from the frame. 
   In an embodiment, the scraping device has a lip connected to the front end of the frame and extending above the frame wherein the lip is raised to allow material to be pushed from the frame. 
   It is, therefore, an advantage of the present invention to provide a push block, a scraping device and a method for collecting a material which may provide an earthmoving device with efficient travel over various topographies, including topographies that have irregularities in the ground surface. 
   Another advantage of the present invention is to provide a push block, a scraping device and a method for collecting a material which may reduce the risk of delays associated with damage to the machine and attached tires. 
   Another advantage of the present invention is to provide a push block, a scraping device and a method for collecting a material that maintains ground clearance for the push block during travel of an earthmoving device. 
   Another advantage of the present invention is to provide a push block, a scraping device and a method for collecting a material that prevents heightened areas in a road from interrupting travel of the device. 
   Another advantage of the present invention is to provide a push block, a scraping device and a method for collecting a material that allows force to be exerted upon the push block without altering the ground clearance of the push block. 
   Another advantage of the present invention is to provide a push block, a scraping device and a method for collecting a material that positions a push block at a height that allows a scraping device having impeded travel to be pushed away from a road irregularity. 
   Another advantage of the present invention is to provide a push block, a scraping device and a method for collecting a material that adjusts a ground clearance of the scraping device frame and/or maintains a height of the push block. 
   Another advantage of the present invention is to provide a push block, a scraping device and a method for collecting a material that allows a second vehicle to push a scraping device while the ground clearance of the scraping device may be altered. 
   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 
       FIG. 1  illustrates a side view of the earth moving scraping device in an embodiment of the invention. 
       FIG. 2  illustrates a perspective view of the earth moving scraping device in an embodiment of the invention. 
       FIG. 3  illustrates a perspective view of the earth moving scraping device in an embodiment of the invention. 
       FIG. 4  illustrates a side view of the push block attached to the earth moving scraping device in an embodiment of the invention. 
       FIG. 5  illustrates a side view of the push block attached to the earth moving scraping device in an embodiment of the invention. 
       FIG. 6  illustrates a side view of the push block attached to the earth moving scraping device in an embodiment of the invention. 
   

   DETAILED DESCRIPTION 
   The present invention generally relates to a push block, a scraping device, and a method for collecting a material. More specifically, the present invention relates to a push block, a scraping device and a method for collecting a material wherein the push block extends rearward from a scraping device. The push block may have a bumper for transmitting force to a scraping device. The bumper may have a surface facing away from the vehicle that allows force to be exerted on the push block by contact with another vehicle. The push block may have a first upper pivot connected to an upper arm and/or may have a lower pivot connected to a tire beam. The tire beam and/or the upper arm may be pivotally connected to the frame of the scraping device. The tire beam may have one or more axles that connect one or more wheels to the tire beam. The wheels may engage a surface to provide movement for the attached scraping device. The bumper of the push block may maintain a consistent ground clearance despite changes in a position of the scraping device and/or clearance of the frame of the scraping device. 
     FIG. 1  generally illustrates a scraping device  1  in an embodiment of the present invention. The scraping device  1  may have a bowl-shaped frame  2  having side walls  13  and a floor  5  defining an interior  3  into which materials may be collected and/or transported. A blade  10  may be attached to the frame  2  at a front frame end  22  of the frame  2 . 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 . 
     FIG. 2  generally illustrates an elevated view of the frame  2 . A lip  20  may be attached to the frame  2  at the front end  22  of the frame  2 . The lip  20  may be sized wherein a height of the lip  20  may be substantially the same or may be greater than a height of the frame  2 . A width of the lip  20  may be substantially the same or may be less than a width 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 front end  22  of the frame  2 . 
   The lip  20  may be pivotally connected to the frame  2  at lip connection points  29   a ,  29   b  on sides  28 ,  30 , respectively, of the lip  20 . Cylinders  24 ,  26  may be attached to the lip  20  on the sides  28 ,  30  at cylinder connection points  63   a ,  63   b . The cylinders  24 ,  26  may be partially shielded by flaps  55  that may be attached to the lip  20 . In an embodiment, the lip  20  may be pivotally attached to the walls  13  of the frame  2  by, for example, pins (not shown) inserted at points  29   a ,  29   b . The cylinders may be attached to the frame  2  at the front end  22  of the frame  2 . The cylinders  24 ,  26  may be hydraulic and may use a hydraulic fluid to effect movement of the cylinders  24 ,  26 . 
   An ejector plate  36  may be positioned at a back end  38  of the frame  2 . The ejector plate  36  may be sized wherein a height of the ejector plate  36  may be substantially the same as, or may be greater than, the height of the frame  2 . A width of the ejector plate  36  may be substantially the same as, or may be less than, the width 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 . 
   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. Wheels  80  may be associated with the scraping device  1  to enable the scraping device  1  to be transported. 
   The scraping device  1  may be connected to a tractor (not shown) and may be pulled across an area to collect materials within the frame  2 . The cylinders  24 ,  26  may be moved to raise the lip  20 . The opening may then be exposed at the front frame end  22  of the frame  2 , and materials may be collected through the opening. As the scraping device  1  is moved across the area, the blade  10  and/or the router bit  82  may slice into the area and may cause materials to be removed from the area. The removed materials may be collected at the back end  38  of the frame  2 . After the materials have been collected, the cylinders  24 ,  26  may be moved to lower the lip  20  and may prevent the collected materials from slipping from the frame  2  through the opening at the front frame end  22  of the frame  2 . The ejector plate  36  may move toward the lip  20  for removing the materials from the scraping device  2 . As the ejector plate  36  moves toward the lip  20 , the materials within the frame  2  may be pushed by the ejector plate  36  through the opening within the frame  2 . 
   A front lift mechanism  60  may be associated with the front end  22  of the frame  2 . The front lift mechanism  60  may have two front cylinders  12   a ,  12   b . Alternatively, the front lift mechanism  60  may have one front cylinder. The front cylinders  12   a ,  12   b  may be positioned above the tongue  57 . The front cylinders  12   a ,  12   b  may be pivotally connected to first plates  14   a  at top ends  15   a  of the first plates  14   a . The first plates  14   a  may be fixedly connected to the back end  59  of the tongue  57  so that movement of the first plates  14   a  may cause corresponding movement of the back end  59  of the tongue  57 . The second plates  14   b  may be fixedly connected to the front end  22  of the frame  2  so that movement of the second plates  14   b  may cause corresponding movement of the front end  22  of the frame  2 . In a preferred embodiment, the second plates  14   b  may be fixedly attached to a front tube  91  on the front end  22  of the frame  2 . The front cylinders  12   a ,  12   b  may be connected to the second plates  14   b  at top ends  15   b  of the second plates  14   b . Accordingly, the first plates  14   a , second plates  14   b  and front cylinders  12   a ,  12   b  may provide a triangular shape. 
   Furthermore, the first plates  14   a , the second plates  14   b  and the front cylinders  12   a ,  12   b  may associate the tongue  57  with the front end  22  of the frame  2 . Bottom ends  16   b  of the second plates  14   b  may be in a position opposite to the top ends  15   b  of the second plates  14   b . Bottom ends  16   a  of the first plates  14   a  may be in a position opposite to that of the top ends  15   a  of the first plates  14   a . The bottom ends  16   a  of the first plates  14   a  may be pivotally connected to the bottom ends  16   b  of the second plates  14   b . The bottom ends  16   a  of the first plates  14   a  may be pivotally connected to the bottom ends  16   b  of the second plates  14   b  at a pivot  71  below the tongue  57 . Therefore, pivotal association of the first plates  14   a  with the second plates  14   b  may allow the tongue  57  to be pivotally associated with the front end  22  of the frame  2 . 
   A rear lift mechanism  61  may be associated with the back end  38  of the frame  2 . The rear lift mechanism  61  may have a rear cylinder  63 . Alternatively, the rear lift mechanism  61  may have more than one rear cylinder. As generally shown in  FIG. 3 , the rear lift mechanism  61  may have rear plates  66  attached to the back end  38  of the frame  2 . The rear plates  66  may be fixedly connected to the back end  38  of the frame  2  so that movement of the rear plates  66  may cause corresponding movement of the back end  38  of the frame  2 . In a preferred embodiment, the rear plates  66  may be fixedly attached to a rear tube  92  on the back end  38  of the frame  2 . The rear plates  66  may have top ends  70  and/or bottom ends  72  in a position opposite to the top ends  70 . The rear plates  66  may have a top pivot  68  at the top ends  70  and/or a bottom pivot  69  at the bottom ends  72 . The rear lift mechanism  61  may have a beam  102  with at least one tire  80  ( FIGS. 1 and 2 ) attached to the beam  102 . The beam  102  may have a front end  105  pivotally attached to the bottom pivot  69  of the rear plates  66 . The rear cylinder  63  may be pivotally attached to the top pivot  68  of the rear plates and/or may be pivotally attached to the beam  102 . Accordingly, the rear plates  66 , the beam  102  and the rear cylinder  63  may provide a triangular shape. In a preferred embodiment of the present invention, the rear cylinder  63  may be attached to a top surface  103  of the beam  102  by a third rear pivot  110 . 
   The front end  22  and/or the back end  38  may be raised to increase clearance underneath the frame  2  of the scraping device  1 . The front end  22  and/or the back end  38  may be lowered to decrease clearance underneath the frame  2  of the scraping device  1 . 
     FIGS. 4-6  illustrate an embodiment of a push block arrangement and an adjustable linkage system connecting the push block arrangement to the back end  38  of a scraper frame  2 . Certain components illustrated in  FIGS. 1-3  are illustrated in  FIGS. 4-6  along with details of the linkage system and the push block arrangement. As generally shown in  FIGS. 4-6 , a tire beam system  200  may include a central beam  202  with a first end  203  and a second end  204 , and may include a support  218 . The central beam  202  may be connected to the frame  2  of the scraping device  1  to transversely support a load of the scraping device  1 . A first axle (not shown) may attach to the first end  203  of the central beam  202  and/or a second axle (not shown) may attach to the second end  204  of the central beam  202 . Multiple axles may be attached to the central beam  202  and may allow multiple tires (not shown) to connect to the central beam  202 . An extensible tire beam arm  250  (compare the varying length of tire beam arm  250  in  FIGS. 4 ,  5 , and  6 ) may connect to the support  218  via a tire beam pivot  215 . The support  218  may be connected to the central beam  202 . 
   As seen in  FIGS. 4-6 , a push block  300  may be connected to the back end  38  of the frame  2  of the scraping device  1 . The push block  300  may have a generally rectangular bumper  301 . The bumper  301  may have a flat upper surface  302 . The bumper  301  may have a flat lower surface  303  that may be in a position opposite to the flat upper surface  302  and/or may be parallel to the flat upper surface  302 . An inner vertical surface  304  may be adjacent to the frame  2  of the scraping device  1  and/or may be perpendicular to the upper surface  302  and/or the lower surface  303 . An outer vertical surface  305  may be in a position opposite to the inner vertical surface  304 . The push block  300  may have a support  360  that connects the bumper  301  to the back end  38  of the frame  2 . The support  360  may have an upper block surface  320  and/or may have a lower block surface  330 . The lower surface  330  of the bumper  301  may have a distance  340  from the ground that may provide ground clearance for the push block  300 . The frame  2  of the scraping device  1  may have a distance  240  from the ground. 
   The outer vertical surface  305  may be convex relative to the bumper  301  so that the convex outer vertical surface  305  provides additional surface area relative to a bumper  301  having a flat outer vertical surface  305 . The additional surface area of the outer vertical surface  305  may increase the force transmitted to the scraping device  1  by contact of an additional vehicle (not shown) with the push block  300 . The additional surface area provided by the convex shape of the outer vertical surface  305  may allow contact with the push block  300  from various angles to transmit force to the scraping device  1 . Force generated by the scraping device  1  and/or the force transmitted by the contact with the additional vehicle may be transmitted to the blade  10 . 
   The push block  300  may be pivotally attached to an upper arm  306  at a first upper pivot  307  and/or may be pivotally attached to the central beam  202  at a first lower pivot  309 . The first lower pivot  309  may be a distance  440  from the ground. The push block  300  may be in a level orientation wherein the distance  440  of the first lower pivot  309  from the ground may be approximately equal to the distance  340  of the lower surface  330  of the push block  300  from the ground. Pivotal attachment at the first upper pivot  307  may be provided by a first pin  350  inserted between the upper arm  306  and the push block  300 . Pivotal attachment at the first lower pivot  309  may be provided by a second pin  351  inserted between the central beam  202  and the push block  300 . 
   The upper arm  306  may be pivotally attached to the back end  38  of the frame  2  of the scraping device  1  at a second upper pivot  310 . Pivotal attachment at the second upper pivot  310  may be provided by a third pin  352  inserted between the upper arm  306  and the back end  38  of the frame  2  of the scraping device  1 . The support  218  may connect the central beam  202  to a second lower pivot  311  on the back end  38  of the frame  2  of the scraping device  1 . Pivotal attachment at the second lower pivot  311  may be provided by a fourth pin  353  inserted between the support  218  and the back end  38  of the frame  2  of the scraping device  1 . 
   The first lower pivot  309  and the second lower pivot  311  may form a line  312  that may be parallel to the upper arm  306 . A length of the upper arm  306  may be equal to a length of the line  312  between the first lower pivot  309  and the second lower pivot  311 . The first lower pivot  309  and the first upper pivot  307  may form a line  313  that may be parallel to a line  314  between the second upper pivot  310  and the second lower pivot  311 . A distance from the first lower pivot  309  to the first upper pivot  307  may be equal to a distance from the second upper pivot  310  to the second lower pivot  311 . Thus, the first upper pivot  307 , the first lower pivot  309 , the second upper pivot  310  and the second lower pivot  311  may each form a corner of a parallelogram shape. As can be seen in  FIGS. 4-6 , the upper arm  306  and tire beam system  200  together with the four pivots  307 ,  309 ,  310 , and  311 , form components of a parallelogram linkage system that connects the push block  300  to the back end  38  of scraper  1 . 
   INDUSTRIAL APPLICABILITY 
   As generally shown in  FIGS. 4-6 , the scraping device  1  may be adjusted to raise or to lower the frame  2  relative to the ground. The frame  2  may be raised and/or lowered by the front lift mechanism  60  and/or the rear lift mechanism  61 . As can be seen by comparing the length of tire beam arm  250  and the varying positions of the parallelogram shape in  FIGS. 4-6 , tire beam arm  250  may be extended and retracted, and may be, for example, rear cylinder  63  of rear lift mechanism  61  shown in  FIGS. 1 and 3 . 
   As shown in  FIG. 5 , the push block  300  may maintain the distance  340  from the adjacent ground despite adjustment of the frame  2  so that the back end  38  of the frame  2  may be closer to the ground. Movement of the back end  38  of the frame  2  to a position closer to the ground may move the central beam  202  in a direction upward relative to the frame  2  and, therefore, may move the first lower pivot  309  in a direction upward relative to the second lower pivot  311 . The movement in an upward direction of the central beam  202  and/or movement in an upward direction of the first lower pivot  309  may force the push block  300  in a direction upward relative to the second lower pivot  311 . Movement of the push block  300  upward relative to the second lower pivot  311  may move the first upper pivot  307  in a direction upward relative to the second lower pivot  311  and/or the second upper pivot  310 . 
   The upper arm  306  may maintain the distance between the first upper pivot  307  and the second upper pivot  310 . The push block  300  may maintain the distance between the first upper pivot  307  and the first lower pivot  309 . The support  218  may maintain the distance between the first lower pivot  309  and the second lower pivot  311 . The back end  38  of the frame  2  may maintain the distance between the second upper pivot  310  and the second lower pivot  311 . 
   Thus, the first upper pivot  307 , the first lower pivot  309 , the second upper pivot  310  and the second lower pivot  311  may maintain the parallelogram shape despite the movement in a direction upward of the push block  300  relative to the back end  38  of the frame  2 . 
   Maintaining the parallelogram shape may maintain the distance  340  of the push block  300  from the ground consistent despite the decrease in the distance  240  of the frame  2  from the ground. The parallelogram shape may provide a level orientation of the push block  300  relative to the ground wherein the distance  440  of the lower pivot  309  from the ground is approximately equal to the distance  340  of the lower surface  330  of the push block  300  from the ground. 
   As generally shown in  FIG. 6 , if the back end  38  of the frame  2  is at a distance farther from the ground, the push block  300  may maintain the distance  340  from the adjacent ground. Movement of the back end  38  of the frame  2  to a position farther from the ground may move the central beam  202  downward relative to the frame  2  and, therefore, may move the first lower pivot  309  in a direction downward relative to the second lower pivot  311 . The movement of the central beam  202  in a direction downward and/or the first lower pivot  309  in a direction downward may force the push block  300  in a direction downward relative to the second lower pivot  311 . Movement of the push block  300  downward relative to the second lower pivot  311  may move the first upper pivot  307  downward relative to the second lower pivot  311  and/or the second upper pivot  310 . 
   The first upper pivot  307 , the first lower pivot  309 , the second upper pivot  310  and the second lower pivot  311  may maintain the parallelogram shape if the push block  300  moves in a direction downward relative to the back end  38  of the frame  2 . Maintaining the parallelogram shape may maintain the distance  340  of the bumper  301  from the ground if the distance  240  of the frame  2  from the ground is increased. The parallelogram shape may provide level orientation of the push block  300  relative to the ground wherein the distance  440  of the lower pivot  309  from the ground is approximately equal to the distance  340  of the lower surface  330  of the push block  300  from the ground. 
   It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments disclosed. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed embodiments. It is intended that the specification and examples be considered as examples only, with a true scope being indicated by the following claims.