Abstract:
A track assembly and electrolytic container for the electro-refining and electrowinning of metals is disclosed. The container of this invention has mirror image integrally cast lip and trough sections in each interior side wall of the container for accepting a track assembly. The track assembly has a track means for engaging and guiding a separating member and a track retainer means for frictionally engaging and securing the track means to both of the interior side walls. The track assembly and electrolytic container of the instant invention facilitates the removal of unwanted slimes from the electrolytic container while keeping the electrolytic process operational during the removal period.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to containers for highly corrosive solutions and more particularly to containers for use in the electrolytic refinement or electrowinning of metals such as for example, copper, cobalt, nickel and zinc. 
     The electrolytic refining process for various metals results in the deposition of by-products on the floor of the electrolytic container. The by-products are known by those skilled in the art as “slimes”. The slimes include precious metals, such as for example, gold and silver, and impurities contained in the electrolyte. These by-products over time accumulate as a slurry on the floor of the electrolytic container. Up until the present invention, removal of the slimes from the container involved removing the cathodes and anodes (i.e., the electrodes) contained within the electrolytic container, decanting the liquid electrolyte in the container above the slimes and then draining the slimes from the bottom floor of the container. Prior to the present invention, removal of the slimes, involved stopping the entire electrolytic process to accomplish the removal of the accumulated precious metals and salt impurities that accumulated on the bottom of the electrolytic container. As will be understood by those skilled in the art, the slimes were required to be removed in the course of the electrolytic process to prevent the deposition of the slimes on the cathode. Deposition of the slimes on the cathode results in a drop in the purity of the metal to be produced by the electrolytic process. Interruption of the electrolytic process to accomplish slime removal reduces the efficiency and the productivity of the electrolytic plant. Removal of the electrodes and electrolyte from the electrolytic container and the manual washing of the electrolytic container makes the process of removing slimes labor-intensive and subjects individuals carrying out these tasks to various health hazards due to the potential for contact with the corrosive liquid electrolyte. 
     The present invention provides a track assembly and electrolytic container for the automated removal of the slimes from the bottom of the container while the electrolytic process carried out in the container remains operational. Thus, manual labor of removing the electrodes and electrolyte and washing of the container is minimized and/or substantially eliminated along with the above-mentioned health risks. 
     2. Brief Description of the Background Art 
     U.S. Pat. No. 5,066,379 (&#39;379 Patent) discloses a container for corrosive material. The &#39;379 Patent discloses an electrolytic container formed of polymer concrete having an integrally molded overflow box, inlet channel, decanting passage, discharge pipe and drain hole. This patent discloses that sludge on or near the bottom of the container is drained from the container through a normally plugged drain hole. The &#39;379 Patent sets forth that the bottom of the container is sloped from one side and one end or both sides and one end to facilitate the removal of sludge. 
     PCT/F198/00655 (&#39;655 Application) entitled, “Separating Member for Separating the Tank Bottom Part from the Rest of the Tank” discloses a separating member for separating the bottom part of an electrolytic tank from the rest of the tank in connection with the removal of solids settled onto the bottom of the electrolytic tank. The &#39;655 Application discloses support and control members installed in the electrolytic tank which form the trajectory of the separating member. In contrast, the present invention provides an integrally molded container allowing engagement of the track without mechanical fasteners that can corrode or create unacceptable stresses in the polymer composite of the electrolytic container construction. 
     While the above-mentioned background art electrolytic containers and separating members are known, they do not disclose an electrolytic container having the unique integrally molded lip and trough section embodiments of the present invention, nor is the background art concerned with providing a track assembly and an electrolytic container having a constant and uniform cross-section of the track slot from the entry point at the top of the electrolytic container through the vertical path, the curved elbow transition section, and horizontal path of the lip and trough section of the shell as described herein by the present invention. 
     Therefore, in spite of this background material, there remains a very real and substantial need for an electrolytic container having an integrally molded shell and track assembly capable of mechanically engaging and guiding a bendable separating member providing for the separation of the slimes on the bottom of the electrolytic container from the electrolyte that is in the rest of the electrolytic container. Having the separating member in place and engaged in the track assembly of this invention provides for the elimination of the slimes from the electrolytic container during active operation of the electrorefining process. 
     SUMMARY OF THE INVENTION 
     The present invention has met the above-described needs. The present invention provides a electrolytic container comprising a cured polymer concrete shell having an integrally cast lip and trough section on the interior side walls. The trough section and lip of the present invention form an area in the interior of the side wall having a cavity. The present invention provides an electrolytic container including at least two track assemblies, each having track means for mechanically engaging and guiding a bendable separating member. The track means of the present invention is in juxtaposition to and in communication with the cavity of the interior side wall formed by the trough section and the lip of the shell. The instant invention further provides retainer means for frictionally engaging the track means and the lip of the interior side wall of the shell of the container. The retainer means secures the track means to the cavity of the interior side wall of the shell. One track assembly is secured to each interior side wall of the container. 
     Another embodiment of the present invention provides the electrolytic container as described herein, wherein any one point of reference along the track assembly as secured in the cavity area of one of the interior side walls is equidistant relative to a mirror image corresponding point of reference of the other track assembly secured in the cavity area of the other interior side wall. 
     A further embodiment of the instant invention provides an electrolytic container having a track means that includes a bottom face having a groove. The groove of the bottom face of the track means of the present invention accommodates an elastic gasket. The elastic gasket is flexible and compressible, thus allowing the retainer means to be positioned on top of the track means by frictional engagement as described herein. 
    
    
     The track assembly and the electrolytic container of the present invention will be more fully understood from the following descriptions of the invention, the drawings and the claims appended hereto. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a partial sectional side view of a form of the track assembly, track means, retainer means and the integrally cast lip and trough section of the electrolytic container of the present invention, wherein the retainer means is shown frictionally engaging the track means to secure the track means in the cavity of the interior side wall. 
     FIG. 2 is a partial sectional side view of a form of the track assembly, track means, retainer means and the integrally cast lip and trough section of the electrolytic container of the present invention, wherein the retainer means is shown as it rotates into position while causing mechanical compression of the elastic gasket of the track. 
     FIG. 3 is a partial sectional side view of a form of the track assembly and the electrolytic container of the instant invention that shows an optional embodiment of the present invention wherein a pin is inserted through the inclined face of and through the body of the retainer means and through the top face and body of the track. 
     FIG. 4 is a partial left side view of a form of the track assembly and electrolytic container of the present invention that shows the modular sections of the track and retainer means installed in the electrolytic container. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention provides for a track assembly and electrolytic container for use in the electrorefining or electrowinning of various metals such as for example, but not limited to, copper, zinc, nickel and cobalt. FIGS. 1-4 illustrate various views of a preferred form of the track assembly and electrolytic container of the present invention. In FIGS. 1-4, the electrolytic container comprises a cured polymer concrete shell  3 , having a floor  5 , a pair of tapered interior side walls  7   a ,  7   b  ( 7   b  not shown in FIGS. 1-4) wherein the taper provides a greater width at the top  9  of the shell relative to the floor  5  of the shell. FIG. 4 shows that the shell  3  has a pair of opposed interior end walls  11   a ,  11   b  ( 11   b  not shown in FIG. 4;  11   a  and  11   b  not shown in FIGS.  1 - 3 ). In FIGS. 1-3, each of the interior side walls  7   a ,  7   b  include a lip  13   a ,  13   b  ( 13   b  not shown in FIGS. 1-3) and trough section  15   a ,  15   b  ( 15   b  not shown in FIGS.  1 - 3 ). The lip  13   a ,  13   b  has a negative return surface  17   a ,  17   b  ( 17   b  not shown in FIGS. 1-4;  17   a  not shown in FIG. 4) that is integrally cast on the interior side wall  7   a ,  7   b  of the shell  3 . The lip  13   a ,  13   b  is located above the trough section  15   a ,  15   b , wherein the trough section  15   a ,  15   b  is integrally cast on the bottom portion of the interior side wall  7   a ,  7   b  of the shell  3 . In FIGS. 1-3, the trough section  15   a ,  15   b  is in juxtaposition to and in communication with the floor  5 , and wherein the lip  13   a ,  13   b  and the trough section  15   a ,  15   b  form an area in the interior side wall  7   a ,  7   b  having a cavity  19   a ,  19   b  ( 19   b  not shown in FIGS.  1 - 3 ). The lip  13   a ,  13   b  and the trough section  15   a ,  15   b  extend in a substantially horizontal path  21   a ,  21   b  ( 21   b  not shown in FIG.  4 )along the length of each of the interior side walls  7   a ,  7   b . FIG. 4 shows that the floor  5  has a first end  5   a  (FIG.  4 ), a second end  5   b  (not shown in FIG. 4) and a middle section  5   c  (FIG. 4) disposed between the first end  5   a  and the second end  5   b , wherein the first end  5   a  of the floor  5  has an arcuate shape  5   d  (FIG.  4 ). Preferably, arcuate shape  5   d  has a radius of curvature from about 180 to 380 millimeters. The arcuate shape  5   d  bows upwardly relative to the middle section  5   c  of the floor  5  such that the first end  5   a  of the floor  5  communicates with interior end wall  11   a  of the shell  3 . The lip  13   a ,  13   b  and the trough section  15   a ,  15   b  continue from the horizontal path  21   a ,  21   b  ( 21   b  not shown in FIG. 4) along the length of the interior side wall  7   a ,  7   b  ( 7   b  not shown in FIG. 4) to form a curved elbow transition section  23   a ,  23   b  ( 23   b  not shown in FIG. 4) on the interior side wall  7   a ,  7   b  ( 7   b  not shown in FIG.  4 ). The curved elbow transition section  23   a ,  23   b  each has a radius of curvature from about 180 to 390 millimeters that is substantially similar to the radius of curvature of the arcuate shape  5   d  of the first end  5   a  of the floor  5 . It will be understood by those skilled in the art that FIG. 4 shows that the present invention includes wherein the lip  13   a ,  13   b  ( 13   b  not shown in FIG. 4) and the trough section  15   a ,  15   b  ( 15   a  and  15   b  not shown in FIG. 4) continue to extend in a vertical path  25   a  (FIG. 4) on the interior side wall  7   a ,  7   b  ( 7   b  not shown in FIG. 4) from the curved elbow transition section  23   a ,  23   b , respectively, to the top  9  of the shell  3 . 
     Any one point of reference along the lip  13   a  and the trough section  15   a  of interior side wall  7   a  is equidistance relative to a mirror-image corresponding point of reference of the lip  13   b  and the trough section  15   b  of the interior side wall  7   b  throughout the horizontal paths  21   a  and  21   b , respectively, the curved elbow transition sections  23   a  and  23   b , respectively, and the vertical paths  25   a  and  25   b , respectively. 
     The container of the present invention, as described herein, further includes at least two track assemblies  27   a ,  27   b  ( 27   b  not shown in FIGS. 1-4) each having (i) track means  29   a ,  29   b  ( 29   b  not shown; and all further reference numerals bearing a letter “b” for all future elements of this invention are not shown in FIGS. 1-4) for mechanically engaging and guiding a bendable separating member (not shown) wherein the track means  29   a ,  29   b  is in juxtaposition to and in communication with at least a portion of the cavity  19   a ,  19   b  of the interior side wall  7   a ,  7   b  formed in part by the trough section  15   a ,  15   b  and the lip  13   a ,  13   b , and (ii) retainer means  31  a,  31   b  for frictionally engaging the track means  29   a ,  29   b  and the negative return surface  17   a ,  17   b  of the lip  13   a ,  13   b  of the interior side wall  7   a ,  7   b  for securing the track means  29   a ,  29   b  to the interior side wall  7   a ,  7   b , respectively, of the shell  3 , as shown in FIGS. 1-3. 
     The retainer means  31   a ,  31   b  is in communication with and is positioned above the track means  29   a ,  29   b , respectively, and below the negative return surface  17   a ,  17   b  of the lip  13   a ,  13   b , respectively. One track assembly  27   a  is in juxtaposition to and in communication with one interior side wall  7   a  and wherein the other track assembly  27   b  is in juxtaposition to and in communication with the other interior side wall  7   b.    
     In another embodiment of this invention, the track assembly and electrolytic container further includes wherein any one point of reference along the track assembly  27   a  is equidistance relative to a mirror image corresponding point of reference of the other track assembly  27   b.    
     The track assembly and the electrolytic container of the present invention are fabricated with abrasion-resistant ceramics in the composite material to provide wear resistance to the sliding movement of the separating member that is engaged in the track means. The structural shape, as shown in FIGS. 1-4, of the electrolytic container of the present invention is designed to eliminate sharp corners and stress concentrations. More particularly, FIG. 4 shows the arcuate shape  5   d  of the floor  5  that communicates with the interior end wall  11   a  of the shell  3 . U.S. Pat. No. 5,079,050, incorporated by reference herein, sets forth a polymer composite that may be used in the fabrication of the track assembly and electrolytic container of the present invention. 
     In another embodiment of the present invention as set forth in FIG. 1-3, the track assembly and container as described herein, further includes wherein the track means  29   a ,  29   b  comprises a track  33   a ,  33   b , respectively. The track  33   a ,  33   b  has a front face  35   a ,  35   b  having a first end  37   a ,  37   b , a second end  39   a ,  39   b , and a middle section  41   a ,  41   b  disposed between the first end  37   a ,  37   b  and the second end  39   a ,  39   b , respectively. The front face  35   a ,  35   b  of the track  33   a ,  33   b  is oriented such that it is exposed to the open interior space of the container  1 . Further, the track  33   a ,  33   b  has a top face  43   a ,  43   b  having a first end  45   a ,  45   b , a second end  47   a ,  47   b  and a middle section  49   a ,  49   b  disposed between the first end  45   a ,  45   b  and the second end  47   a ,  47   b , respectively. FIGS. 1-3 show that the surface of the top face  43   a  of the track  33   a  is a sloped surface, wherein the slope proceeds downward from the first end  45   a  to the second end  47   a  of the top face  43   a . Preferably, the slope of the top face  43   a  is at an angle of from about 1 to 15 degrees, and most preferably is an angle of about 10 degrees. The second end  39   a ,  39   b  of the front face  35   a ,  35   b  of the track  33   a ,  33   b  is in communication with the first end  45   a ,  45   b  of the top face  43   a ,  43   b  of the track  33   a ,  33   b , respectively. Further, the track  33   a ,  33   b  includes a back face  51   a ,  51   b  having a first end  53   a ,  53   b , a second end  55   a ,  55   b , and a middle section  57   a ,  57   b  disposed between the first end  53   a ,  53   b  and the second end  55   a ,  55   b , respectively. The first end  53   a ,  53   b  of the back face  51   a ,  51   b  of the track  33   a ,  33   b  is in communication with the second end  47   a ,  47   b  of the top face  43   a ,  43   b  of the track  33   a ,  33   b , respectively. The back face  51   a ,  51   b  of the track  33   a ,  33   b  is in juxtaposition to and in communication with a portion of the interior side wall  7   a ,  7   b  above the trough section  15   a ,  15   b  and below the lip  13   a ,  13   b , respectively. Further, the track  33   a ,  33   b  has a chamfered section  59   a ,  59   b  having a first end  61   a ,  61   b , a second end  63   a ,  63   b  and a middle section  65   a ,  65   b  disposed between the first end  61   a ,  61   b  and the second end  63   a ,  63   b , respectively. The first end  61   a ,  61   b  of the chamfered section  59   a ,  59   b  of the track  33   a ,  33   b  is in communication with the second end  55   a ,  55   b  of the back face  51   a ,  51   b  of the track  33   a ,  33   b , respectively. When completely installed into position, FIGS. 1-3 show that the chamfered section  59   a ,  59   b  of the track  33   a ,  33   b  is free of any communication with the interior side wall  7   a ,  7   b , respectively. Further, the track  33   a ,  33   b  has a bottom face  67   a ,  67   b  having a first end  69   a ,  69   b , a second end  71   a ,  71   b  and a middle section  73   a ,  73   b  disposed between the first end  69   a ,  69   b  and the second end  71   a ,  71   b , respectively. The first end  69   a ,  69   b  of the bottom face  67   a ,  67   b  of the track  33   a ,  33   b  is in communication with the second end  63   a ,  63   b  of the chamfered section  59   a ,  59   b  of the track  33   a ,  33   b , respectively. The second end  71   a ,  71   b  of the bottom face  67   a ,  67   b  of the track  33   a ,  33   b  is in communication with the first end  37   a ,  37   b  of the front face  35   a ,  35   b  of the track  33   a ,  33   b , respectively. Further, the track  33   a ,  33   b  has a pair of side walls  75   a ,  75   b  and  77   a  (not shown in FIGS.  1 - 3 ),  77   b  wherein each side wall  75   a ,  75   b  and  77   a ,  77   b  is in communication with the front face  35   a ,  35   b , the top face  43   a ,  43   b , the back face  51   a ,  51   b , the chamfered section  59   a ,  59   b , and the bottom face  67   a ,  67   b  of the track  33   a ,  33   b , respectively. The bottom face  67   a ,  67   b  of the track  33   a ,  33   b  has an arcuate shape  68   a ,  68   b , respectively. The arcuate shape  68   a ,  68   b  preferably has a radius of curvature of from about 20 to 25 millimeters. The bottom face  67   a ,  67   b  of the track  33   a ,  33   b  has a groove  79   a ,  79   b  extending from and through one side wall  75   a ,  75   b  of the track  33   a ,  33   b , through the body of track  33   a ,  33   b  and through the other side wall  77   a ,  77   b  of the track  33   a ,  33   b , respectively. The groove  79   a ,  79   b  accommodates a portion of a circumference of an elastic gasket  81   a ,  81   b , respectively. FIGS. 1-3 show that the middle section  41   a ,  41   b  of the front face  35   a ,  35   b  of the track  33   a ,  33   b  has a slot  36   a ,  36   b , respectively, for engaging and guiding the bendable separating member (not shown). FIGS. 1-3 show that slot  36   a ,  36   b  has a base surface  34   a ,  34   b , a ceiling surface  38   a ,  38   b , and a rear wall surface  40   a ,  40   b , respectively. Slot  36   a ,  36   b  extends from and through one side wall  75   a ,  75   b  of the track  33   a ,  33   b , through the body of the track  33   a ,  33   b , and through the other side wall  77   a ,  77   b  ( 77   a  and  77   b  not shown in FIGS. 1-3) of the track  33   a ,  33   b , respectively. 
     In FIGS. 1-3, the retainer means  31   a ,  31   b  has a front face  83   a ,  83   b  having a first end  85   a ,  85   b , a second end  87   a ,  87   b , and a middle section  89   a ,  89   b  disposed between the first end  85   a ,  85   b  and the second end  87   a ,  87   b , respectively. The retainer means  31   a ,  31   b  further includes, an inclined face  91   a ,  91   b  having a first end  93   a ,  93   b , a second end  95   a ,  95   b , and middle section  97   a ,  97   b  disposed between the first end  93   a ,  93   b  and the second end  95   a ,  95   b , respectively. FIGS. 1-3 show that the surface of the inclined face  91   a  of the retainer means  31   a  is a sloped surface, wherein the slope proceeds upward from the first end  93   a  to the second end  95   a  of the inclined face  91   a . Preferably, the slope of the inclined face  91   a  is at an angle of from about 40 to 50 degrees, and most preferably is an angle of about 45 degrees. 
     The first end  93   a ,  93   b  of the inclined face  91   a ,  91   b  of the retainer means  31   a ,  31   b  is in communication with the second end  87   a ,  87   b  of the front face  83   a ,  83   b  of the retainer means  31   a ,  31   b , respectively. The retainer means  31   a ,  31   b  further includes a chamfered face  99   a ,  99   b  having a first end  101   a ,  101   b , a second end  103   a ,  103   b , and a middle section  105   a ,  105   b  disposed between the first end  101   a ,  101   b  and the second end  103   a ,  103   b , respectively. Preferably, the chamfered face  99   a ,  99   b  is a curved face, and most preferably the curved face has a radius of curvature from about 3 to 6 millimeters. The first end  101   a ,  101   b  of the chamfered face  99   a ,  99   b  of the retainer means  31   a ,  31   b  is in communication with the second end  95   a ,  95   b  of the inclined face  91   a ,  91   b  of the retainer means  31   a ,  31   b , respectively. The retainer means  31   a ,  31   b  further includes a back face  107   a ,  107   b  having a first end  109   a ,  109   b , a second end  111   a ,  111   b , and a middle section  113   a ,  113   b  disposed between the first end  109   a ,  109   b  and the second end  111   a ,  111   b , respectively. The first end  109   a ,  109   b  of the back face  107   a ,  107   b  of the retainer means  31   a ,  31   b  is in communication with the second end  103   a ,  103   b  of the chamfered face  99   a ,  99   b  of the retainer means  31   a ,  31   b , respectively. 
     The retainer means  31   a ,  31   b  further includes a heel face  110   a ,  110   b  having a first end  112   a ,  112   b  and a second end  114   a  and  114   b , respectively. The second end  111   a ,  111   b  of the back face  107   a ,  107   b  of the retainer means  31   a ,  31   b  is in communication with the first end  112   a ,  112   b  of the heel face  110   a ,  110   b  of the retainer means  31   a ,  31   b , respectively. Preferably, the heel face  110   a ,  110   b  each have a radius of curvature of from about 3 millimeters to 6 millimeters. 
     The retainer means  31   a ,  31   b  further includes a bottom face  115   a ,  115   b  having a first end  117   a ,  117   b , a second end  119   a ,  119   b , and a middle section  121   a ,  121   b  disposed between the first end  117   a ,  117   b  and the second end  119   a ,  119   b , respectively. The second end  114   a ,  114   b  of the heel face  110   a ,  110   b  of the retainer means  31   a ,  31   b  is in communication with the first end  117   a ,  117   b  of the bottom face  115   a ,  115   b  of the retainer means  31   a ,  31   b , respectively. The second end  119   a ,  119   b  of the bottom face  115   a ,  115   b  of the retainer means  31   a ,  31   b  is in communication with the first end  85   a ,  85   b  of the front face  83   a ,  83   b  of the retainer means  31   a ,  31   b , respectively. Further, the retainer means  31   a ,  31   b  of the present invention includes a pair of side walls  123   a ,  123   b  and  125   a ,  125   b , respectively. Each side wall  123   a ,  123   b  and  125   a ,  125   b  is in communication with the front face  83   a ,  83   b , the incline face  91   a ,  91   b , the chamfered face  99   a ,  99   b , the heel face  110   a ,  110   b , the back face  107   a ,  107   b , and the bottom face  115   a ,  115   b  of the retainer means  31   a ,  31   b , respectively. 
     FIG. 1 shows the container  1  of the present invention wherein the bottom face  115   a  of the retainer means  31   a  is in frictional engagement with and is in communication with the top face  43   a  of the track  33   a . FIG. 1 shows the chamfered face  99   a  of the retainer means  31   a  is in frictional engagement with and is in communication with the negative return surface  17   a , of the lip  13   a  of the interior side wall  7   a , and wherein the back face  107   a  of the retainer means  31   a  is in frictional engagement and is in communication with the interior side wall  7   a  at a location below the negative return surface  17   a  of the lip  13   a  and above the back face  51   a  of the track means  29   a.    
     FIG. 1 further shows the elastic gasket  81   a  in the track means  29   a  is compressed to establish a sealed engagement of the bottom face  67   a  of the track means  29   a  with the trough section  15   a  of the interior side wall  7   a  when the retainer means  29   a  is completely positioned and in frictional engagement with the top face  43   a  of the track means  29   a  and the negative return surface  17   a  of the lip  13   a  of the interior side wall  7   a.    
     As is shown in FIGS. 1-3, the sum of the height of the (a) track assembly  27   a , (b) the elastic gasket  81   a  in an uncompressed state and positioned in the groove  79   a , and (c) the maximum height of the retainer means  31   a , is greater than the clearance height from the lowest portion of the trough section  15   a  to the negative return surface  17   a  of the lip  13   a.    
     FIG. 2 shows retainer means  31   a  being rotated into position and thus resulting in mechanical frictional engagement with the track means  29   a . The chamfered face  99   a  and heel face  110   a  of the retainer means  31   a , and the top face  43   a  of the track means  29   a  and the elastic gasket  81   a  allow for the rotation and snap-fit of the track assembly  27   a  into the final position as shown in FIGS. 1 and 3. FIG. 2 illustrates the leverage action of the snap-fit of the retainer means  31   a  compressing the track means  29   a  and the elastic gasket  81   a  into the oval cross-section of the trough section  15   a . FIG. 1, shows the final position of the track assembly  27   a  with elastic gasket  81   a  in a compressed state to maintain a tight and secure fit of the track assembly  27   a  in the cavity  19   a , of the interior side wall  7   a . The retainer means  31   a ,  31   b  is sized in the vertical dimension of the interior side wall  7   a , 7   b  when the elastic gasket  81   a ,  81   b  is deformed into a semi-flattened shape and thus resulting in the elastic gasket&#39;s  81   a ,  81   b  sealed engagement with the trough section  15   a ,  15   b  of the interior side wall  7   a ,  7   b , respectively. It will be appreciated by those skilled in the art that the deformation of the elastic gasket  81   a ,  81   b  is designed to apply sufficient constant pressure on the track  33   a ,  33   b  and the retainer means  31   a ,  31   b  to keep the track assembly  27   a ,  27   b  in permanent compression and position, respectively. 
     In an optional embodiment of the present invention as shown in FIG. 3, a hole is drilled and a pin  131  is inserted through the hole created through the incline face  91   a  of the retainer means  31   a  and through the body of the retainer means  31   a  and through the top face  43   a  and the body of the track  33   a . Preferably, grouting is placed in the area  132  (FIG. 3) above the pin  131  (and surrounding the circumference of the pin  131 ) for establishing a sealed engagement of the pin  131  to and in the body of the retainer means  31   a  and the body of the track  33   a . The grouting used is preferably of a polymer composite as described in U.S. Pat. No. 5,079,050. 
     It will be appreciated by those skilled in the art that the track of the present invention may be made up of one or more modular sections. The modular sections of the track are selected from a group of straight modules and curved modules. Preferably, each of the curved modules has a radius of curvature of from about 180 to 390 millimeters. It will also be appreciated by those skilled in the art that the retainer means of the present invention may be made up of one or more of modular sections, wherein the modular sections are selected from a group of straight modules and curved modules, and preferably, wherein each of the curved modules has a radius of curvature of from about 180 to 390 millimeters. 
     Whereas particular embodiments of the present invention have been described herein for the purpose of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present invention may be made without departing in the invention as defined in the appended claims.