Patent Publication Number: US-6984088-B1

Title: Pivoting barrier transporter and positioner

Description:
REFERENCE TO PRIOR APPLICATIONS 
   The present application is a continuation-in-part to U.S. application Ser. No. 10/146,613 filed on May 15, 2002, now U.S. Pat. No. 6,832,870 entitled “Barrier Transporter and Positioner,” having the same inventor. Applicant claims May 15, 2002 as his filing date. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The field of the invention is traffic barriers, or, more specifically, movable traffic barriers. 
   2. Description of Related Art 
   For security reasons, many government and private organizations desire to control automotive traffic into their facilities through gates, entrances and the like. Typically, these organizations transport heavy, solid traffic barriers using forklifts and other heavy equipment. In other instances, water-filled barriers are used so that the barriers are lighter during transport due to lack of water in the barrier until it is later added after the barrier is positioned. 
   In some instances electric gates are provided that allow rapid opening and closing of an entrance, however, these are cantilevered or wheeled, thus significantly reducing resistance to automobile or truck impact. 
   It is a significant drain on time and the workforce to have heavy equipment involved when barriers must be moved or installed. Similarly, refilling water-filled barriers is time consuming and labor intensive. 
   These problems are amplified when a row of barriers is desired to block access to large facility items such as a ship in dock, etc. 
   What is needed is an apparatus that provides for rapid, rolling transport of a heavy barrier into a desired security position and then provides a rapid ability to position the barrier on the ground for maximum impact resistance. The apparatus should be readily operated by one user without the need for forklifts or heavy equipment, and the apparatus should transport water-filled barriers without the need to drain the barrier. 
   SUMMARY OF THE INVENTION 
   My invention provides an apparatus for the rapid, rolling transport of a heavy barrier, including water-filled barriers, and also provides for the rapid placement of the barrier on the ground surface when in the desired position. The apparatus is operable by a single user without the need for forklifts or heavy equipment. Subsequent relocation of the barrier is accomplished rapidly, even in a gate open-close environment requiring frequent repositioning of the barrier. 
   In various embodiments of my invention, the barrier is received by a wheeled elevator structure and lift assemblies for raising and lowering the elevator structure, such that the barrier received by the elevator structure is also raised and lowered. While raised the apparatus can be rolled and steered to a desired barrier position. When in the desired location the lift assemblies lower the elevator structure to its lowest position such that the barrier&#39;s weight is off the wheels and on the ground surface. In some embodiments my invention pivots in gate-like fashion about a fixed member such as a post. 
   My invention provides an apparatus for transporting and positioning a barrier on a surface, the apparatus comprising: an elevator adapted to receive the barrier, the elevator having a first end and a second end; a first wheel assembly having at least two wheel members and a second wheel assembly having at least two wheel members; and a first lift assembly positioned proximate the elevator first end and cooperating with the first wheel assembly for raising and lowering the elevator first end, and a second lift assembly positioned proximate the elevator second end and cooperating with the second wheel assembly for raising and lowering the elevator second end, the barrier being raised and lowered with the elevator. 
   In one exemplary embodiment the elevator provides lateral support for the barrier. 
   In one exemplary embodiment the apparatus further comprises a powered hydraulic system for simultaneously operating the first and second lift assemblies, the first and second lift assemblies each comprising a hydraulic cylinder. 
   In one exemplary embodiment at least one of the first and second lift assemblies comprises a single acting hydraulic cylinder. 
   In one exemplary embodiment at least one of the first and second lift assemblies comprises a double acting hydraulic cylinder. 
   In one exemplary embodiment both the first and second lift assemblies comprise double acting hydraulic cylinders and the cylinders are positioned such that the first and second wheel assemblies are elevated above the surface after the elevator is lowered to the elevator&#39;s lowest position. 
   In one exemplary embodiment the apparatus further comprises a controller for operating the powered hydraulic system. 
   In one exemplary embodiment the controller is detachable. 
   In one exemplary embodiment the apparatus further comprises a powered system for simultaneously operating the first and second lift assemblies, the first and second lift assemblies each comprising a powered lift mechanism. 
   In one exemplary embodiment the apparatus further comprises a controller for operating the powered system. 
   In one exemplary embodiment the controller is detachable. 
   In one exemplary embodiment the apparatus further comprises a remote controller. 
   In one exemplary embodiment the first lift assembly comprises a first manual jack and the second lift assembly comprises a second manual jack. 
   In one exemplary embodiment the first and second manual jacks are positioned such that the first and second wheel assemblies are elevated above the surface after the elevator is lowered to the elevator&#39;s lowest position. 
   In one exemplary embodiment the first lift assembly comprises a first hydraulic jack and the second lift assembly comprises a second hydraulic jack. 
   In one exemplary embodiment the first and second hydraulic jacks are in hydraulic communication for simultaneous lifting. 
   In one exemplary embodiment the apparatus further comprises a steering assembly for turning the apparatus. 
   In one exemplary embodiment the steering assembly comprises a powered hydraulic system having a double-acting hydraulic cylinder, the cylinder having a rod, and a steering linkage assembly for linking the hydraulic cylinder to one of the first wheel assembly wheel members and linking the one wheel member to the other first wheel assembly wheel member for simultaneous steer-turning in response to extension and retraction of the rod from and into the hydraulic cylinder. 
   In one exemplary embodiment the steering assembly comprises: a pivot member for each first wheel assembly wheel member, each wheel member steer-turning in response to movement of the pivot member; a shaft member, the handle member being attached to the first wheel assembly for pivoting; and a link member for linking the handle member and wheel pivot members, such that both wheel member pivot arms move in response to pivoting motion of the shaft. 
   In one exemplary embodiment the apparatus further comprises a powered driving assembly for driving the apparatus. 
   In one exemplary embodiment the apparatus further comprises a powered driving assembly for driving the apparatus by rotating at least one of the second wheel assembly wheel members. 
   In one exemplary embodiment the driving assembly comprises a powered hydraulic system having a hydraulic driving assembly on the at least one wheel member. 
   In one exemplary embodiment the apparatus further comprises a hydraulic brake. 
   In one exemplary embodiment the apparatus further comprises a brake. 
   There is provided herein an apparatus for transporting and positioning a barrier on a surface, the apparatus comprising: an elevator adapted to receive the barrier, the elevator having a first end and a second end; a first wheel assembly having at least two wheel members and a second wheel assembly having at least two wheel members, the first wheel assembly positioned proximate the elevator first end, the second wheel assembly positioned proximate the elevator second end; and elevating means for raising and lowering the elevator with respect to the first and second wheel assemblies, the barrier being raised and lowered with the elevator. 
   In one exemplary embodiment the elevating means comprises a first manual jack proximate the first wheel assembly and a second manual jack proximate the second wheel assembly. 
   In one exemplary embodiment the elevating means comprises a first hydraulic jack proximate the first wheel assembly and a second hydraulic jack proximate the second wheel assembly. 
   In one exemplary embodiment the elevating means comprises a powered hydraulic system comprising a first hydraulic cylinder proximate the first wheel assembly and a second hydraulic cylinder proximate the second wheel assembly. 
   In one exemplary embodiment the elevating means comprises a powered system comprising a first powered lifting mechanism proximate the first wheel assembly and a second powered lifting mechanism proximate the second wheel assembly. 
   In one exemplary embodiment the apparatus further comprises means for driving the apparatus. 
   In one exemplary embodiment the apparatus further comprises means for steering the apparatus. 
   In one exemplary embodiment the apparatus further comprises means for braking the apparatus. 
   I have provided in my invention, an apparatus for transporting and positioning a barrier on a surface, the apparatus comprising: an elevator adapted to receive the barrier, the elevator having a first end and a second end; a first wheel assembly having at least two wheel members and a second wheel assembly having at least two wheel members; and a first lift assembly positioned proximate the elevator first end and cooperating with the first wheel assembly for raising and lowering the elevator first end, and a second lift assembly positioned proximate the elevator second end and cooperating with the second wheel assembly for raising and lowering the elevator second end, the barrier being raised and lowered with the elevator; and further wherein the elevator provides lateral support for the barrier; and the apparatus further comprises: a powered hydraulic system for simultaneously operating the first and second lift assemblies, the first and second lift assemblies each comprising a double-acting hydraulic cylinder, the cylinders being positioned such that the first and second wheel assemblies are elevated above the surface after the elevator is lowered to the elevator&#39;s lowest position; a controller for operating the powered hydraulic system; a powered steering assembly for turning the first wheel assembly wheel members, the steering assembly being powered by the powered hydraulic system; and a powered driving assembly for turning the second wheel assembly wheel members, the driving assembly being powered by the powered hydraulic system. 
   My invention provides an apparatus for transporting and positioning a barrier on a surface, the barrier having a first end, second end, a front side, a rear side, a top portion, and a bottom portion having a lower surface, the bottom portion being substantially wider than the top portion when viewed from the barrier first and second ends, the apparatus pivoting about a fixed member, the apparatus comprising: an elevator adapted to receive the barrier, the elevator having a base, the barrier bottom portion lower surface being positioned on the base, a first end and a second end, a first upright member having a top, a second upright member having a top, and a connection member for connecting the first upright member top and the second upright member top, the first upright member having a width substantially the same as or less than the barrier top portion first end, the second upright member having a width substantially the same as or less than the barrier top, portion second end, and the connection member having a width substantially the same as or less than the barrier top portion, the first and second upright members and the connection member being positioned proximate the barrier first and second ends and top portion, respectively, such that the barrier front side and the barrier rear side are viewable without substantial obstruction from the first upright member, second upright member and the connection member; a wheel assembly having a wheel member; a pivot assembly for pivotably affixing the apparatus to the fixed member; a first lift assembly positioned proximate the elevator first end and cooperating with the pivot assembly for raising and lowering the elevator first end, and a second lift assembly positioned proximate the elevator second end and cooperating with the wheel assembly for raising and lowering the elevator second end, the barrier being raised and lowered with the elevator. 
   In one exemplary embodiment, the elevator provides lateral support for the barrier. 
   In one exemplary embodiment, the apparatus further comprises a powered hydraulic system for simultaneously operating the first and second lift assemblies, the first and second lift assemblies each comprising a hydraulic cylinder. 
   In one exemplary embodiment, at least one of the first and second lift assemblies comprises a single acting hydraulic cylinder. 
   In one exemplary embodiment, at least one of the first and second lift assemblies comprises a double acting hydraulic cylinder. 
   In one exemplary embodiment, both the first and second lift assemblies comprise double acting hydraulic cylinders and the cylinders are positioned such that the wheel assembly is elevated above the surface after the elevator is lowered to the elevator&#39;s lowest position. 
   In one exemplary embodiment, the apparatus further comprises a controller for operating the powered hydraulic system. 
   In one exemplary embodiment, the controller is detachable. 
   In one exemplary embodiment, the apparatus further comprises a powered system for simultaneously operating the first and second lift assemblies, the first and second lift assemblies each comprising a powered lift mechanism. 
   In one exemplary embodiment, the apparatus further comprises a controller for operating the powered system. 
   In one exemplary embodiment, the controller is detachable. 
   In one exemplary embodiment the apparatus further comprises a remote controller. 
   In one exemplary embodiment, the first lift assembly comprises a first manual jack and the second lift assembly comprises a second manual jack. 
   In one exemplary embodiment, the first and second manual jacks are positioned such that the wheel assembly is elevated above the surface after the elevator is lowered to the elevator&#39;s lowest position. 
   In one exemplary embodiment, the first lift assembly comprises a first hydraulic jack and the second lift assembly comprises a second hydraulic jack. 
   In one exemplary embodiment, the first and second hydraulic jacks are in hydraulic communication for simultaneous lifting. 
   In one exemplary embodiment the apparatus further comprises a powered driving assembly for driving the apparatus by rotating the wheel member. 
   In one exemplary embodiment, the driving assembly comprises a powered hydraulic system having a hydraulic driving assembly on the wheel member. 
   An apparatus is provided for transporting and positioning a barrier on a surface, the barrier having a first end, second end, a front side, a rear side, a top portion, and a bottom portion having a lower surface, the bottom portion being substantially wider than the top portion when viewed from the barrier first and second ends, the apparatus pivoting about a fixed member, the apparatus comprising: an elevator adapted to receive the barrier, the elevator having a base, the barrier bottom portion lower surface being positioned on the base, a first end and a second end, a first upright member having a top, a second upright member having a top, and a connection member for connecting the first upright member top and the second upright member top, the first upright member having a width substantially the same as or less than the barrier top portion first end, the second upright member having a width substantially the same as or less than the barrier top portion second end, and the connection member having a width substantially the same as or less than the barrier top portion, the first and second upright members and the connection member being positioned proximate the barrier first and second ends and top portion, respectively, such that the barrier front side and the barrier rear side are viewable without substantial obstruction from the first upright member, second upright member and the connection member; a pivot assembly pivotably affixing the apparatus to the fixed member, the pivoting a assembly positioned proximate the elevator first end; a wheel assembly having a wheel member, the wheel assembly positioned proximate the elevator second end; and elevating means for raising and lowering the elevator with respect to the pivot assembly and the wheel assembly, the barrier being raised and lowered with the elevator. 
   In one exemplary embodiment, the elevating means comprises a first manual jack proximate the pivot assembly and a second manual jack proximate the wheel assembly. 
   In one exemplary embodiment, the elevating means comprises a first hydraulic jack proximate the pivot assembly and a second hydraulic jack proximate the wheel assembly. 
   In one exemplary embodiment, the elevating means comprises a powered hydraulic system comprising a first hydraulic cylinder proximate the pivot assembly and a second hydraulic cylinder proximate the wheel assembly. 
   In one exemplary embodiment, the elevating means comprises a powered system comprising a first powered lifting mechanism proximate the pivot assembly and a second powered lifting mechanism proximate the wheel assembly. 
   In one exemplary embodiment the apparatus further comprises means for driving the apparatus. 
   I have provided in my invention an apparatus for transporting and positioning a barrier on a surface, the barrier having a first end, second end, a front side, a rear side, a top portion, and a bottom portion having a lower surface, the bottom portion being substantially wider than the top portion when viewed from the barrier first and second ends, the apparatus pivoting about a fixed member, the apparatus comprising: an elevator adapted to receive the barrier, the elevator having a base, the barrier bottom portion lower surface being positioned on the base, a first end and a second end, a first upright member having a top, a second upright member having a top, and a connection member for connecting the first upright member top and the second upright member top, the first upright member having a width substantially the same as or less than the barrier top portion first end, the second upright member having a width substantially the same as or less than the barrier top portion second end, and the connection member having a width substantially the same as or less than the barrier top portion, the first and second upright members and the connection member being positioned proximate the barrier first and second ends and top portion, respectively, such that the barrier front side and the barrier rear side are viewable without substantial obstruction from the first upright member, second upright member and the connection member; a pivot assembly for pivotably affixing the apparatus to the fixed member; a wheel assembly having a wheel member; and a first lift assembly positioned proximate the elevator first end and cooperating with the pivot assembly for raising and lowering the elevator first end, and a second lift assembly positioned proximate the elevator second end and cooperating with the wheel assembly for raising and lowering the elevator second end, the barrier being raised and lowered with the elevator; and further wherein the elevator provides lateral support for the barrier; and the apparatus further comprises: a powered hydraulic system for simultaneously operating the first and second lift assemblies, the first and second lift assemblies each comprising a double-acting hydraulic cylinder, the cylinders being positioned such that the wheel assembly is elevated above the surface after the elevator is lowered to the elevator&#39;s lowest position; a controller for operating the powered hydraulic system; and a powered driving assembly for turning the wheel assembly wheel member, the driving assembly being powered by the powered hydraulic system. 
   My invention provides an apparatus for transporting and positioning a barrier on a surface, the barrier having a first end, second end, a front side, a rear side, a top portion, and a bottom portion having a lower surface, the bottom portion being substantially wider than the top portion when viewed from the barrier first and second ends, the apparatus comprising: an elevator adapted to receive the barrier, the elevator having a base, the barrier bottom portion lower surface being positioned on the base, a first end and a second end, a first upright member having a top, a second upright member having a top, and a connection member for connecting the first upright member top and the second upright member top, the first upright member having a width substantially the same as or less than the barrier top portion first end, the second upright member having a width substantially the same as or less than the barrier top portion second end, and the connection member having a width substantially the same as or less than the barrier top portion, the first and second upright members and the connection member being positioned proximate the barrier first and second ends and top portion, respectively, such that the barrier front side and the barrier rear side are viewable without substantial obstruction from the first upright member, second upright member and the connection member; a wheel assembly having a wheel member; a fixed member, the fixed member being attached to the surface; a pivot assembly, the pivot assembly being pivotably attached to the fixed member; a first lift assembly positioned proximate the elevator first end and cooperating with the pivot assembly for raising and lowering the elevator first end, and a second lift assembly positioned proximate the elevator second end and cooperating with the wheel assembly for raising and lowering the elevator second end, the barrier being raised and lowered with the elevator. 
   The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts of exemplary embodiments of the invention. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an oblique view of an exemplary embodiment of the present invention having manual lift assemblies. The barrier is in position on the elevator structure. 
       FIG. 2  is an oblique view of a conventional water-filled barrier. 
       FIG. 3  is an oblique view of an exemplary embodiment of the present invention with the barrier removed. 
       FIG. 4  is a side view of an exemplary embodiment of the present invention with the barrier removed. 
       FIG. 5  is an end view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in a raised position. 
       FIG. 6  is an end view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in the down position with the wheels jacked off the ground. 
       FIG. 7  is a top view of an exemplary embodiment of the present invention with the barrier removed and a manual steering assembly included. 
       FIG. 8  is an oblique view of an exemplary embodiment of the present invention with the barrier removed and selected components of a powered hydraulic system shown representatively. 
       FIG. 9  is a top view of an exemplary embodiment of the present invention with the barrier removed and a powered hydraulic system shown, with hydraulic line routing being shown representatively for clarity. 
       FIG. 10  is a schematic of an exemplary embodiment of the powered hydraulic system. 
       FIG. 11  is a front view of an exemplary embodiment of the controller control panel and a remote controller. 
       FIG. 12  is an end view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in a raised position. 
       FIG. 13  is an end view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in the down position with the wheels hydraulically lifted off the ground. 
       FIG. 14  is a side view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in a raised position. 
       FIG. 15  is an oblique view of an exemplary embodiment of the present invention having manual lift assemblies. 
       FIG. 16  is a side view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in a raised position. 
       FIG. 17  is a side view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in a lowered position. 
       FIG. 18  is an end view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in a raised position. 
       FIG. 19  is a top view of an exemplary embodiment of the present invention with the barrier removed. 
       FIG. 20  is an oblique view of an exemplary embodiment of the present invention with the barrier removed and selected components of a powered hydraulic system shown representatively. 
       FIG. 21  is a top view of an exemplary embodiment of the present invention with the barrier removed and a powered hydraulic system shown, with hydraulic line routing being shown representatively for clarity. 
       FIG. 22  is a schematic of an exemplary embodiment of the powered hydraulic system. 
       FIG. 23  is a side view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in a raised position. 
       FIG. 24  is a side view of an exemplary embodiment of the present invention with the barrier removed and the elevator structure in the down position with the wheel hydraulically lifted off the ground. 
   

   DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
   Introduction 
   The present invention is described to a large extent in this specification in connection with conventional water-filled barriers traffic barriers that are drainable and refillable to assist in transport. Persons skilled in the art, however, will recognize that any barrier material or construction having similar shape and function also falls well within the scope of the present invention, including without limitation, concrete and metal barriers. 
   Detailed Description 
   As shown in  FIGS. 1–6 , an exemplary embodiment of my invention provides transport and positioning for a barrier  22  on a surface  21 . The barrier  22  shown is of a conventional water-filled type, as shown in  FIG. 2 . These typically interlock at the ends to form barrier rows, although many installations include single barrier applications for blocking a gate, road or entrance. 
   The barrier  22  is removed from  FIG. 3 , wherein an exemplary embodiment of the apparatus  20  is shown to include a first wheel assembly with two wheels  30 , 32  and an axle structure  34  that connects the wheels. Similarly, a second wheel assembly includes two wheels  40 , 42  and an axle structure  44  that connects these wheels. In other embodiments, one or more additional wheels are included in the first and/or second wheel assemblies. 
   As shown in  FIG. 3 , an elevator structure  50  is positioned between the first and second wheel assemblies. The elevator structure  50  includes the base with openings  51  and sides  52 . In this exemplary embodiment, the sides  52  encapsulate the lower portion of the barrier  22 , and as shown in  FIG. 1 , thus provide lateral support for the barrier. 
   Attached to the first end of the elevator structure  50  and sides  52  is an upright post-like member  54 , with a similar member  56  on the second end of the elevator structure. The upright members  54 , 56  are attached by a cross member  58 . In some embodiments, the elevator structure includes angle iron with four inch sides  52  and the upright members  54 , 56  are made from with iron and boxed on one side with braces on the open side. In other embodiments, the elevator structure includes side-less elevator structure. 
   As shown in  FIG. 1  the upright members  54 , 56  have top portions that have widths that are substantially the same as or less than the narrower top portion of the barrier  22  ends. The cross member  58  that connects the upright members also has a width that is less than the width of the top portion of the barrier. In another exemplary embodiment, the cross member is substantially the same as the width of the barrier top portion. With the upright members and the cross member sized in this manner, the upright members and the cross members do not substantially obstruct the view of the front or rear sides of the barrier. 
   As shown in  FIG. 3 , the elevator structure  50  has a base upon which the lower surface of the barrier bottom portion is shown to be positioned in  FIG. 1 . 
   Turning now to  FIG. 4 , a first lift assembly is shown in side view, where attached to the first end upright member  54  is a manual jack telescoping portion  60  that telescopes over a manual jack telescoped portion  62  during a jacking operation wherein a jack handle  64  is cranked. The manual jack telescoped portion  62  is attached to the first wheel assembly axle structure  34 . As the telescoped portion is extended from the jack telescoping portion  60 , the upright member  54  rises with the telescoping portion  60 , thus lifting the elevator  50  and the barrier  22  positioned on the elevator. 
   A similar arrangement is present on the second end for a second lift assembly where a manual jack telescoping portion  70  telescopes over a manual jack telescoped portion  72  in response to manual cranking of the jack handle  74 . The telescoping portion is attached to the upright member  56  and the telescoped portion  72  is attached to the second wheel assembly axle structure  44 . During coordinated rotation (simultaneous or alternating) of both handles  64 , 74  the telescoping portions are forced upwardly thus raising the upright members  54 , 56  and the elevator structure  50 . As shown clearly in  FIG. 5 , this coordinated cranking displaces the elevator structure from the surface  21  and the wheels are free to turn as the apparatus  20  is pushed or pulled. 
   Conversely, and as shown in  FIG. 6 , if the coordinated rotation of jack handles  64 , 74  is reversed the elevator structure  50  is lowered to the surface  21 . Continued cranking in this direction, after the elevator structure is on the surface, will elevate the wheels  30 , 32 , 40 , 42  from the ground surface  21 . This assures that the full weight of the barrier  22  is being borne by the surface, avoids damage to the tires caused by long term, static contact with the surface, which may be dirt with moisture, and also makes it simpler to attach protective wheel coverings. The appearance also suggests a “permanent” placement of the barrier to an observer and facilitates easy removal of the wheels, if desired. 
   The manual jacks are conventional mechanical jacks for which several known types will suffice. As shown in  FIG. 5  and  FIG. 6 , however, the amount of jack travel must be sufficient to allow the elevator structure  50  to descend to its lowest position. In some embodiments, the jack travel is limited to the length necessary for the elevator structure to reach the lowest position. In others, such as the type of embodiments shown in  FIG. 5  and  FIG. 6 , additional travel allows the wheels to be elevated above the ground. 
   With reference to  FIG. 7 , an additional exemplary embodiment of the apparatus  100  is shown to include a modified first wheel assembly with the two wheels  110 , 112  being attached for pivoting in steering fashion on an axle structure  114 . The first wheel  110  is attached to a pivot member  116  that is pivotably attached to the axle structure on a pivot pin  118 . Similarly, the second wheel  112  is attached to a pivot member  120  that is pivotably attached to the axle structure on a pivot pin  122 . A steering shaft  124  with a handle  126  is pivotably attached to the axle structure with a similar pivot pin (not shown). 
   As shown in  FIG. 7 , this embodiment has a tie-rod assembly  132  attached to the steering shaft  124  on a pivot pin  130 . The steering shaft is attached to the first wheel&#39;s pivot member  116  on a pivot pin  134 , and attached to the second wheel&#39;s pivot member  120  on a pivot pin  136 . The rigid tie-rod assembly moves left and right toward the wheels  110 , 112  as the steering shaft moves left and right. This tie-rod movement causes simultaneous movement of the pivot members  116 , 120  in the same direction, thus steering the apparatus  100  left and right in response to the left and right steering shaft  124  movements. 
   An additional exemplary embodiment of the apparatus  200  is shown in  FIGS. 8–14  to include a powered hydraulic system for operating the lift assemblies, steering the apparatus, and driving the rear wheels. Selected components of the hydraulic system are shown representatively in  FIG. 8 , with more detail shown in  FIG. 9 .  FIG. 10  is a schematic depiction of the powered hydraulic system. 
   As shown in  FIG. 9 , the first wheel assembly includes two wheels  210 , 212  on an axle structure  214 . The first wheel is pivotably attached to the axle structure on a pivot member  216 , the pivot member pivoting about a pivot pin  218 . Similarly, the second wheel is pivotably attached to the axle structure on a pivot member  220 , this pivot member pivoting about a pivot pin  222 . 
   In embodiments of the type shown in  FIG. 9 , a tie-rod  224  is attached to the first wheel pivot member  226  on a pivot pin  226  and to the second wheel pivot member on a pivot pin  228 . A double-acting hydraulic cylinder  230 , has an extendable rod  232 . The rod&#39;s exposed end is attached to the second wheel pivot member  220  on a pivot pin  234 . A fixed extension member  236  extends from the axle structure  214  and attaches to the hydraulic cylinder  230  on a pin  238 . The travel of the rod  232  is positioned and sized such that a longer extension of the rod moves the second wheel pivot member  220  and simultaneously pulls the tie-rod  224 , and the first wheel pivot member  216 , such that both wheels are steer-turned, i.e. turned in steering fashion, to the left. Conversely, the retraction of the rod pulls the second wheel pivot member  220  and simultaneously pushes the tie-rod  224  and the first wheel pivot member  216 , such that both wheels are steer-turned to the right. 
   In other embodiments, the powered steering assembly is on the second wheel assembly wheels. 
   Embodiments of the kind shown in  FIG. 9 , include a second wheel assembly with two wheels  240 , 242  and an axle structure  244 . Each wheel has a hydraulic drive assembly  246 , 248 , including a hydraulic wheel motor. 
   Embodiments of the kind illustrated in  FIG. 9 , also include a first hydraulic lift assembly including a double-acting hydraulic cylinder  250 . As shown in  FIG. 14 , the hydraulic cylinder has an extendable rod  252 . The rod  252  is attached to the axle structure  214  while the hydraulic cylinder  250  is attached to the elevator structure  264  on the upright member  260 . Such embodiments also include a second hydraulic lift assembly including a double-acting hydraulic cylinder  254  with an extendable rod  256 . The rod  256  is attached to the axle structure  244  while the hydraulic cylinder  250  is attached to the elevator structure  264  on the upright member  262 . The upright members  260 , 262  are connected by a cross member  268 . 
   In other embodiments, the hydraulic cylinders in the lift assemblies are single-acting hydraulic cylinders, and the elevator structure lowers in response to gravity and the weight of the barrier  22  and elevator structure  264 . 
   A frame  270  for positioning a controller  272  is attached to the elevator structure upright member  262 , the controller having a control panel, a control valve assembly, and electric circuitry for operating the panel and control valve assembly. Electric batteries  274  are provided as a power source with conventional wiring  276  shown representatively on  FIG. 9 . Primary hydraulic lines  278  connect the controller to the electrically powered pump assembly  280 . The pump assembly  280  and the batteries  274  are stored in an extension of the elevator structure  264 . 
   Embodiments of the type shown in  FIG. 9  and  FIG. 10 , also include hydraulic lines  282  for providing pressured fluid for the double-acting hydraulic cylinder  250  in the first lift assembly, and hydraulic lines  284  for the double-acting hydraulic cylinder  284  in the second lift assembly. 
   Similarly, a hydraulic line  286  provides fluid to the hydraulic drive assembly  246  on the first wheel  240  of the second wheel assembly, and also provides fluid to line  290  that delivers fluid to the hydraulic drive assembly  248  on the second wheel  242  of the second wheel assembly. Hydraulic line  288  provides fluid to a hydraulic brake  289  on the first wheel  240 , and hydraulic lines  292  provide hydraulic fluid to the double-acting hydraulic cylinder  230  that provides hydraulic power for the steering. 
   Many of the hydraulic lines in  FIG. 9  are shown in a substantially horizontal position for clarity. Persons of skill in the art, upon review of this disclosure will recognize that the present invention includes additional routing configurations in addition to the configuration shown. 
   The functionality of the controller  272  as it operates the powered hydraulic system is shown in  FIG. 11 . Steering controls  294  cooperate with the hydraulic cylinder  230  through conventional valving mechanisms in the controller  272 , to turn the wheels  210 , 212  in the first wheel assembly left and right. The steering controls  294  cause the rod  232  to extend for turning left and retract for turning right. 
   Lift assembly controls  296  cooperate with the hydraulic cylinders  250 , 254  through valving mechanisms in the controller  272  to lift or lower the elevator structure  264 . The lift assembly controls  296  cause the elevator structure to lift as the rods  252 , 256  extend, and to descend as the rods retract. The raised elevator structure position is depicted in  FIG. 12  and the lowered elevator structure position is depicted in  FIG. 13 . 
   Driving controls  298  cooperate with the hydraulic drive assemblies in the second wheel assembly wheels  240 , 242  through valving mechanisms in the controller  272  to rotate such wheels, in rolling fashion, in a forward or reverse direction. In some embodiments, the wheels stop rolling automatically when the driving controls cease to be pressed. In other embodiments, the wheels free-wheel after the driving controls cease to force rolling. The exemplary embodiment shown in  FIG. 9  and  FIG. 11  include an emergency stop control  302  that cooperates with the hydraulic brake  289  in wheel  240  through valving mechanisms in the controller  272  to brake the wheel. In other embodiments, a conventional spring assembly in a brake is biased to apply the brake when the hydraulic fluid flow to the hydraulic driving assemblies  246 , 248  ceases. 
   Persons of skill in the art will recognize, upon review of the present disclosure, that various conventional hydraulic valving mechanisms are available that route hydraulic fluid as necessary for the performance of multiple functions such as those described in exemplary embodiments herein. 
   As shown in  FIG. 11 , this exemplary embodiment  200  has a controller  272  with a keyed on-off switch  300 , for preventing unauthorized use of the hydraulic system controls. 
   In some embodiments of the kind shown in  FIG. 11 , the apparatus  200  includes a remote controller  304  having controls analogous to those of the attached controller  272 , including steering controls  306 , driving controls  308 , lift assembly controls  310 , emergency stop controls  314 , and keyed access control  312 . The remote controller  304  is connected to the controller  272  through cable  314 . 
   In other embodiments, the controller  272  is detachable for storage apart from the barrier and remaining apparatus. 
   Through the use of the controller  272  or remote controller  304 , the operator maneuvers the apparatus  200  into a desired location, either standing alone, in rows, or in staggered patterns that slow, but do not prevent automotive traffic. Once the apparatus is so positioned, the operator manipulates the lift assembly controls  296 , 310  to lower the elevator structure  264  to the lower position on the surface  21 . If desired, the operator can raise the wheels from the surface, as shown in  FIG. 13 . 
   In some embodiments, the first wheel assembly has the hydraulic driving assemblies, in lieu of, or along with the second wheel assembly. 
   In some embodiments, the powered hydraulic system for steering, lifting, driving, and/or braking is replaced with a powered electrical system for steering, lifting, driving and/or braking. 
   In some embodiments, the electric batteries, as a source of power for the pump assembly  280  is replaced by an internal combustion engine. 
     FIGS. 15–19  illustrate an additional exemplary embodiment  400  of my invention that provides transport and positioning for a barrier on a surface  21 . 
   The barrier  22  is removed from  FIG. 15 , wherein an exemplary embodiment  400  of the apparatus is shown as pivotably attached to a fixed member  410  on a base  408  affixed to the ground surface  21 . Such an embodiment includes an elevator  436 , 438  adapted to receive the barrier, the elevator having a first end and a second end, and a wheel assembly having a wheel member  402 . Such an embodiment also includes a pivot assembly  412 ,  414  for pivotably affixing the apparatus to the fixed member  410 , a first lift assembly  420  positioned proximate the elevator first end and cooperating with the pivot assembly  412 , 414  for raising and lowering the elevator first end, and a second lift assembly  428  positioned proximate the elevator second end and cooperating with the wheel assembly  402 , 404  for raising and lowering the elevator second end, the barrier being raised and lowered with the elevator. 
   As shown in  FIG. 16 , an elevator structure  436 , 438  is positioned between the pivot assembly  412 , 414  and the wheel assembly  402 , 404 . The elevator structure includes the base  436  with openings  442  and sides  438 . In this exemplary embodiment, the sides  438  encapsulate the lower portion of the barrier  22 , thus providing lateral support for the barrier. 
   Attached to the first end of the elevator base  436  and sides  438  is an upright post-like member  426 , with a similar member  428  on the second end of the elevator structure. The upright members  426 ,  428  are attached by a cross member  440 . In some embodiments, the elevator structure includes angle iron with four inch sides  438  and the upright members  426 , 428  are made from with iron and boxed on one side with braces on the open side. In other embodiments, the elevator structure includes side-less elevator structure. 
   In  FIG. 16  a first lift assembly is shown in side view, and shown attached to the first end upright member  426  is a manual jack telescoping portion  420  that telescopes over a manual jack telescoped portion  422  during a jacking operation wherein a jack handle  424  is cranked. The manual jack telescoped portion  422  is attached to a pivot assembly extension member  414 . As the telescoped portion is extended from the jack telescoping portion  420 , the upright member  426  rises with the telescoping portion  420 , thus lifting the elevator  436  and the barrier positioned on the elevator. 
   A similar arrangement is present on the second end for a second lift assembly where a manual jack telescoping portion  430  telescopes over a manual jack telescoped portion  432  in response to manual cranking of the jack handle  434 . The telescoping portion is attached to the upright member  428  and the telescoped portion  432  is attached to the wheel assembly axle structure  404 . During coordinated rotation (simultaneous or alternating) of both handles  424 , 434  the telescoping portions are forced upwardly thus raising the upright members  426 , 428  and the elevator structure  436 . As shown clearly in  FIG. 16  and  FIG. 18 , this coordinated cranking displaces the elevator structure from the surface  21  and the wheel is free to pivot about the fixed member  410  as the apparatus  400  is pushed or pulled. 
   Conversely, and as shown in  FIG. 17 , if the coordinated rotation of jack handles  424 , 434  is reversed the elevator structure  436 ,  438  is lowered to the surface  21 . Continued cranking in this direction, after the elevator structure is on the surface, will elevate the wheel  402  from the ground surface  21 . 
   The manual jacks are conventional mechanical jacks for which several known types will suffice. As shown in  FIG. 16  and  FIG. 17 , however, the amount of jack travel must be sufficient to allow the elevator structure to descend to its lowest position. In some embodiments, the jack travel is limited to the length necessary for the elevator structure to reach the lowest position. In others, such as the type of embodiments shown in  FIG. 16  and  FIG. 17 , additional travel allows the wheel to be elevated above the ground. 
   In the exemplary embodiment of  FIG. 15 , the generally perpendicular positioning of the wheel member  402  with respect to the elevator structure  436 , 438  provides a gate-like motion of the apparatus  400  as it pivots about the fixed member  410 . The pivot assembly includes a collar-like member  412  attached to the pivot assembly extension member  414  that allows free-wheeling of the apparatus about the fixed member  410 . 
   An additional exemplary embodiment  500  of the apparatus is shown in  FIGS. 20–24  to include a powered hydraulic system for operating the lift assemblies and driving the wheel member  402 . Selected components of the hydraulic system are shown representatively in  FIG. 20 , with more detail shown in  FIG. 21 .  FIG. 22  is a schematic depiction of the powered hydraulic system. 
   As shown in  FIG. 23 , the wheel assembly includes a wheel  402  on an axle structure  534 . The wheel has a hydraulic drive assembly  538 , including a hydraulic wheel motor. 
   Embodiments of the kind illustrated in  FIG. 23  and  FIG. 24 , also include a first hydraulic lift assembly including a double-acting hydraulic cylinder  510 . As shown in  FIG. 23 , the hydraulic cylinder has an extendable rod  512 . The rod  512  is attached to the pivot assembly extension member  414  while the hydraulic cylinder  510  is attached to the elevator structure  518 , 520  through the upright member  514 . Such embodiments also include a second hydraulic lift assembly including a double-acting hydraulic cylinder  530  with an extendable rod  532 . The rod  532  is attached to the axle structure  534  while the hydraulic cylinder  510  is attached to the elevator structure  518 , 520  through the upright member  516 . The upright members  514 , 516  are connected by a cross member  522 . 
   In other embodiments, the hydraulic cylinders in the lift assemblies are single-acting hydraulic cylinders, and the elevator structure lowers in response to gravity and the weight of the barrier and elevator structure. 
   A frame  540  for positioning a controller  541  is attached to the elevator structure upright member  516 , the controller having a control panel, a control valve assembly, and electric circuitry for operating the panel and control valve assembly. Electric batteries  542  are provided as a power source with conventional wiring  556 , as shown representatively on  FIG. 22 . Primary hydraulic lines  558  connect the controller to the electrically powered pump assembly  544 . The pump assembly  544  and the batteries  542  are stored in an extension of the elevator structure, as shown in  FIG. 21 . 
   Embodiments of the type shown in  FIG. 21  and  FIG. 22 , also include hydraulic lines  550  for providing pressured fluid for the double-acting hydraulic cylinder  510  in the first lift assembly, and hydraulic lines  552  for the double-acting hydraulic cylinder  530  in the second lift assembly. 
   Similarly, hydraulic lines  554  provide fluid to the hydraulic drive assembly  538  on the wheel member  402  of the wheel assembly. 
   Many of the hydraulic lines in  FIGS. 20–21  are shown in a substantially horizontal position with exposed routing for clarity. Persons of skill in the art, upon review of this disclosure will recognize that the present invention includes additional routing configurations in addition to the configuration shown. 
   The functionality of the controller  541  as it operates the powered hydraulic system includes lift assembly controls that cooperate with the hydraulic cylinders  510 , 530  through valving mechanisms in the controller  541  to lift or lower the elevator structure. The lift assembly controls  564  cause the elevator structure to lift as the rods  512 , 532  extend, and to descend as the rods retract. The raised elevator structure position is depicted in  FIG. 23  and the lowered elevator structure position is depicted in  FIG. 24 . 
   Driving controls  562  cooperate with the hydraulic drive assembly  538  in the wheel assembly wheel member  402  through valving mechanisms in the controller  541  to rotate the wheel, in rolling fashion, in a clockwise or counter-clockwise direction. In some embodiments, the wheel stops rolling automatically when the driving controls cease to be pressed. In other embodiments, the wheel free-wheels after the driving controls cease to force rolling. 
   Persons of skill in the art will recognize, upon review of the present disclosure, that various conventional hydraulic valving mechanisms are available that route hydraulic fluid as necessary for the performance of multiple functions such as those described in exemplary embodiments herein. 
   This exemplary embodiment  500  has a controller  541  with a keyed on-off switch  560 , for preventing unauthorized use of the hydraulic system controls. 
   In some embodiments of the kind shown in  FIG. 20 , the apparatus  500  includes a remote controller having controls analogous to those of the attached controller  541 , including driving controls, lift assembly controls, and keyed access control. The remote controller is connected to the controller  541  through a cable. The controller  541  and remote controller are similar in function and appearance to their counterparts illustrated in  FIG. 11 . 
   In other embodiments of the type shown in  FIG. 20 , the controller  541  is detachable for storage apart from the barrier and remaining apparatus. 
   Through the use of the controller  541  or remote controller, the operator maneuvers the apparatus  500  into a desired location. Once the apparatus is so positioned, the operator manipulates the lift assembly controls to lower the elevator structure to the lower position on the surface  21 . If desired, the operator can raise the wheels from the surface, as shown in  FIG. 24 . 
   In some embodiments of the kind shown in  FIG. 20 , the powered hydraulic system for lifting and/or driving is replaced with a powered electrical system for lifting and/or driving. 
   In other embodiments of the kind shown in  FIG. 20 , the electric batteries, as a source of power for the pump assembly  544  is replaced by an internal combustion engine. 
   In another embodiment of the kind shown in  FIG. 20 , the apparatus includes the fixed member  410  and base  408 . 
   With respect to the above description then, it is to be realized that the optimum material and dimensional relationships for the parts of the apparatus, as described in the foregoing exemplary embodiments, will include variations in size, materials, shape, and form, which will occur to those skilled in the art upon review of the present disclosure. 
   It will be understood from the foregoing description that various modifications and changes may be made, and in fact will be made, in the exemplary embodiments of the present invention without departing from its true spirit. The descriptions in this specification are for purposes of illustration only and are not to be construed in a limiting sense. The scope of the present invention is limited only by the language of the following claims.