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FIELD OF THE INVENTION  
       [0001]     The present invention relates to a retaining wall block that is resistant to damage and wear caused by the environment and includes a chamber, which allows the flow of fill material to adjacent blocks below and above. The deterioration resistant block is generally a hollowed frame or shell of a deterioration resistant material that is light-weight and is configured to at least partially align with blocks positioned above and below, thereby forming a continuous chamber capable of accepting and retaining any type of filling material. The filling material provides weight, stability and security to a retaining wall constructed of such blocks.  
       BACKGROUND OF THE INVENTION  
       [0002]     The use of retaining walls to protect and beatify property in all types of environmental settings is a common practice in the landscaping, construction and environmental protection fields. Walls constructed from various materials are used to outline sections of property for particular uses, such as gardens or flower beds, fencing in property lines, reduction of erosion, and to simply beautify areas of a property.  
         [0003]     Numerous methods and materials exist for the construction of retaining walls. Such methods include the use of natural stone, poured in place concrete, masonry, landscape timbers or railroad ties. In recent years, segmental concrete retaining wall units, sometimes known as keystones, which are dry stacked (i.e., built without the use of mortar), have become a widely accepted product for the construction of retaining walls. Examples of such units are described in U.S. Pat. No. RE 34,314 (Forsberg) and in U.S. Pat. No. 5,294,216 (Sievert).  
         [0004]     However, many of the materials utilized in the construction of retaining walls are susceptible to deterioration and/or are not very aesthetically appealing. The ability of these retaining walls to withstand sunlight, wind, water, general erosion and other environmental elements is a problem with most retaining wall products.  
         [0005]     A particular concern is the utilization of erosion protection materials in water shorelines. Leaving the shoreline natural can lead to erosion, cause an unmanageable and unusable shoreline, create high maintenance, and inhibit an aesthetically pleasing property. Many materials utilized in retention of shorelines are subject to immediate deterioration and/or are not as aesthetically appealing as one would desire. Furthermore, many materials utilized on shoreline structures are difficult to maintain due to the awkward location in the water and also the prevalent growth and presence of organic materials that can get caught and flourish in such a structure. For example, many lakeshore or ocean side properties utilize riprap as a retention device for prevention of erosion. Riprap is a configuration of large to medium size stones placed along the shoreline. A problem with waterfront properties that use a continuous wall of typical riprap is the shoreline will retain some organic material or will accumulate additional organic material brought in by the water. This usually leads to an unmanageable and aesthetically displeasing shoreline or higher maintenance. Furthermore, the riprap is never uniform in color and size and therefore does not as provide the most aesthetically pleasing shoreline or complete coverage of the shoreline. The lack of uniform shoreline coverage allows for some erosion, collection of various materials and the growth of weeds.  
         [0006]     Another problem with materials normally utilized in the construction of retaining walls, such as poured in place concrete, masonry, landscape timbers, railroad ties or keystones is that regulations in most states and counties prohibit their use in or near bodies of water because of the crumbling or deterioration of the material into the body of water over time or the leaching of chemicals from the materials into the body of water. Many of these retaining wall materials dissolve, crumble, break apart and/or float into the body of water for which they line causing problems with the shoreline and pollution of the water. For example, the average life of various types of concrete block or keystone in water is approximately a couple of years. A need exists for a retaining wall, which would be resistant to such deterioration.  
         [0007]     An additional concern that exists in the construction of retaining walls is the weight of the materials. Concrete blocks, large or medium size stones, timbers or keystones can be heavy and cumbersome to move into the wall location and maneuver when constructing the wall. Many locations for which retaining walls are constructed are positioned in awkward terrain. Heavy building materials are difficult to move into the location and furthermore are difficult to position when constructing the retaining wall thereby adding additional cost and labor for installation. However, the heavy materials are needed once the wall is constructed to provide stability and security to the structure. Therefore, the easy to install light-weight units used for the construction of a retaining wall, which can be weighted once placed into position thus retaining the block in position and stabilizing the completed retaining wall, would be beneficial to construction of such structures.  
       SUMMARY OF THE INVENTION  
       [0008]     The present invention relates to a retaining wall block that is resistant to damage and wear caused by the environment and includes a chamber, which allows the flow of fill material to adjacent blocks below and above. The deterioration resistant block is generally a hollowed frame or shell of a deterioration resistant material that is light-weight and is configured to interlock with adjacent blocks, thereby forming a continuous chamber capable of accepting and retaining any type of filling material. The filling material provides density and stability to the retaining wall block and also ultimately provides stability and security to the retaining wall constructed of such blocks.  
         [0009]     Various embodiments of the deterioration resistant block of the present invention comprise a front panel, back panel and two or more side panels, which adjoin the front panel and back panel thereby forming a block having a continuous flow chamber. In various embodiments at least two of the side panels extend from the front panel to the back panel at angles (e.g. less than 90°), thereby allowing for a back panel that is of shorter length than the front panel. The continuous flow chamber of each block generally forms a series of integrated channels which allow the flow of fill material from various blocks when such blocks are positioned in a retaining wall. The blocks of the present invention may further include one or more anchoring devices for securing each block to adjacent blocks or securing them into position in the retaining wall. In various embodiments of the present invention one or more of the panels include one or more aprons for interconnecting the stacked blocks. The aprons assist in positioning and/or adjoining adjacent blocks and facilitating the flow of fill material to the adjacent blocks. Additionally, the aprons assist in retaining the fill material within the adjoined blocks and also may lock the adjacent blocks to each other. As previously suggested, the chambers are adapted for receiving and retaining fill materials, such as sand, dirt, gravel, pea rock, concrete or any other similar material, which provides the permanent weighting and stability of the retaining wall block.  
         [0010]     In additional embodiments of the present invention, the blocks may comprise two or more separated panels that are adjoined by a securing mechanism, such as a “T-hook and T-slot”, or a “peg and socket system”. For example, the front panel, side panels and back panel may be separated panels that are secured together to form the blocks of the present invention. These embodiments provide the benefits of providing two or more substantially flat panels and/or nestable panels that may be assembled to form the block. Also, such a process may open other beneficial manufacturing techniques to form such panels, such as extrusion. Such embodiments will also generally provide benefits related to transportation and storage.  
         [0011]     Embodiments the deterioration resistant retaining block of the present invention may be used in constructing retaining walls on a number of property terrains, such as along waterfront properties. The deterioration resistant blocks are particularly useful for terrains near water or underwater due to their resistance to degradation. However, the deterioration resistant blocks could also be used for land applications for those that want a light-weight retaining wall block that can be filled on-site to add weight and stability and doesn&#39;t require heavy equipment for moving. Therefore, the deterioration resistant retaining wall block could be utilized to construct any form of wall or fence structure.  
         [0012]     One unique feature of the present invention is the lightweight characteristic of the block before it is filled. As previously mentioned, embodiments of the present invention can be waterproof and may be filled with any type of fill material located at the site, such as rocks (e.g. crushed rock and pea rock), sand, gravel, soil, concrete or similar materials. The filling characteristic of the deterioration resistant block means that when the block is not filled it is very light-weight. The light-weight feature provides individuals constructing such walls the advantage of easily moving large numbers of the blocks to the site of construction with relative ease. Furthermore, the lightweight characteristic of the blocks allows for easy maneuvering of the blocks into final position when constructing a retaining wall or revetment and still allows for the stability found in heavy blocks after they are filled. These characteristics are met by the block being made of a lightweight material, such as plastic, and by it also being configured to receive a heavy fill material once it has been placed in its final position on the retaining wall.  
         [0013]     Individuals would be more inclined to install block made of a deterioration resistant material themselves rather than cement block, timbers, dry cement process block (e.g. Keystone® or Anchor® block) and the like, because of the ease of installation, due to the lightweight material and also the longevity of the block. The weight of most regular retaining wall block is approximately 30-120 lbs, whereas embodiments of the present invention may be approximately 0.1-10 lbs. Of course, weight may vary depending on the size and materials utilized in manufacturing embodiments of the present invention. Also, as previously mentioned the blocks of the present invention achieve stability and weight by filling the block with an appropriate fill material either prior to or after it has been permanently installed.  
         [0014]     Embodiments of the present invention further fills an unmet landscaping need for shorelines in that the deterioration resistant blocks are easily manufactured. Examples of possible manufacturing methods include but are not limited to injection-molding, extrusion, roto-molding and blow-molding. Also any high volume application for production may be utilized in manufacturing the present invention. The individual units are light-weight, aesthetically pleasing, easy to install, prevent shoreline and other terrain erosion and compliment existing retaining wall block. Various embodiments of the deterioration resistant blocks of the present invention are also waterproof, can withstand ice damage due to their flexible nature and are easily replaced or repaired in case of damage. Furthermore, they are rugged and require very low maintenance. Additionally, embodiments of the present invention are easily transportable and storable due to their light-weight and possible stacking and/or nesting features.  
         [0015]     As previously suggested, embodiments of the present invention are also resistant to deterioration, such as wear, discoloration, crumbling and breaking. Therefore, the deterioration resistant block does not have to be replaced as often and/or increases the lifespan of the retaining wall. Due to these characteristics, the blocks of the present invention generally have a much greater lifespan than the life of a regular dry cast concrete type block or timber. The increased lifespan of the block translates to fewer or no occurrences of replacement of individual blocks or the potential complete reconstruction of the entire wall. Furthermore, retaining wall materials, such as concrete block formed by the dry cast process, (e.g. Keystone® blocks) and timbers are typically not used in water applications because they dissolve, crumble and/or break down over time and exposure. The durability and resistant characteristics of the present invention reduce and prevent this deterioration, therefore making it very beneficial for all applications that come in contact with water.  
         [0016]     Another consideration relating to the water application of embodiments of the retaining wall block of the present invention is the block&#39;s resistance to ice damage when installed around a body of water when it freezes. When ice expands and/or moves it shifts, tears and damages various types materials utilized for shoreline retention, such as concrete block formed by the dry cast process, rip rap, landscape timbers or anything rigid. Embodiments of the present invention can be manufactured with a material that has flexibility, such as non linear low density polyethylene, that may be designed to flex in a similar way as a Rubbermaid® trash container. Considering that the deterioration resistant block would be filled with a fill material, the deformation would be minimal, but still enough to prevent damage to the retaining wall block and/or the entire wall. Furthermore, upon melting or shifting of the ice the deterioration resistant block would return to its original configuration.  
         [0017]     Another advantage of embodiments of the present invention relates to the high cost of waterfront property and people&#39;s inclination to improve their property to keep it well-maintained and aesthetically pleasing. As previously mentioned riprap, is commonly stacked along property shorelines to prevent erosion. The trouble with this shoreline preservation application is that the rock leaves many crevices for organic material to reside and, since it is close to water, the crevices are prominent areas for the growth of vegetation. One advantage of embodiments of the present invention is that they are designed to fit next to each other, which reduces the amount of organic material lodging between the blocks, thereby preventing vegetation from growing in such structures.  
         [0018]     In addition, many waterfront properties suffer water damage when water levels rise above the shoreline. The retaining wall block of the present invention is a solution to water retention and erosion problems in such areas of threatening high or rising water levels. Furthermore, the retaining wall block poses a solution in locations where there is a flood plane or areas that are washed out by any type of water movement. Sandbags have been a solution to such problems, but are not a permanent or aesthetically pleasing solution. The retaining wall block can replace sand bags in an area for which a more permanent and aesthetically pleasing alternative is desired.  
         [0019]     As previously suggested, the deterioration resistant retaining wall block can comprise any type of shape, configuration, color and design. In addition the retaining wall block may include any design or color located anywhere on any panel or wall of the block. Furthermore, the utilization of conventional type materials for retaining walls, such as concrete blocks, timbers or keystones, are heavy to install and do not provide long term or permanent solutions, due to the previously mentioned deterioration problems. Therefore, the present invention provides an aesthetically pleasing solution and replacement for materials, including sandbags, concrete, mortar block, or rip rap, presently utilized in retaining wall construction. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0020]      FIG. 1   a  is a perspective view of one embodiment of a deterioration resistant retaining wall block.  
         [0021]      FIG. 1   b  is a perspective view of another embodiment of a deterioration resistant retaining wall block.  
         [0022]      FIG. 2   a  is a perspective view of an embodiment of a deterioration resistant retaining wall panel block including a T-hook and T-slot securing mechanism.  
         [0023]      FIG. 2   b  is a perspective view of an embodiment of a deterioration resistant retaining wall panel block having no front panel and including a peg and socket securing mechanism.  
         [0024]      FIG. 2   c  is an exploded view of an embodiment of a corner of a deterioration resistant retaining wall panel block having a peg and socket securing mechanism.  
         [0025]      FIG. 2   d  is a perspective view of an embodiment of a deterioration resistant retaining wall panel block including a peg and socket securing mechanism and integral back and side panels.  
         [0026]      FIG. 3   a  is a perspective view of a front, side or back panel that includes a T-hook and T-slot securing mechanism.  
         [0027]      FIG. 3   b  is a front view of a front, side or back panel that includes a plurality of threads that are part of a peg and socket securing mechanism.  
         [0028]      FIG. 3   c  is a front view of a front, side or back panel that includes a slot securing mechanism.  
         [0029]      FIG. 4   a  is a perspective view of a peg including a plurality of panel slots.  
         [0030]      FIG. 4   b  is a top view of the peg of  FIG. 4   a  and also a plurality of partial T-slot panels.  
         [0031]      FIG. 4   c  is a perspective view of a peg and a plurality of panel slots adjacent to a front panel and side panel that include T-hooks.  
         [0032]      FIG. 4   c  is a perspective view of a plurality of pegs including panel slots adjacent to a front panel and side panel that include T-hooks.  
         [0033]      FIG. 5  is a perspective view of one embodiment of a block of the present invention that includes a molded or fabricated front panel displaying a plurality of block or brick.  
         [0034]      FIG. 6   a  is a perspective view of one embodiment of a deterioration resistant retaining wall block with a partial top panel.  
         [0035]      FIG. 6   b  is a perspective view of another embodiment of a deterioration resistant retaining wall block with a partial top panel.  
         [0036]      FIG. 7   a  is a perspective view of a staggered row retaining wall that includes deterioration resistant retaining wall blocks having a flat front panel.  
         [0037]      FIG. 7   b  is a perspective view of a staggered row retaining wall that includes deterioration resistant retaining wall blocks having a beveled front panel.  
         [0038]      FIG. 8   a  is a perspective view of one embodiment of a front panel including a partial top panel.  
         [0039]      FIG. 8   b  is a perspective view of one embodiment of a front panel including a partial top panel with a planting aperture.  
         [0040]      FIG. 9   a  is a perspective view of an embodiment of a deterioration resistant retaining wall block, which includes a securing apron and a partial top panel.  
         [0041]      FIG. 9   b  is a perspective view of another embodiment of a deterioration resistant retaining wall block, which includes a securing apron and a partial top panel.  
         [0042]      FIG. 9   c  is a perspective view of another embodiment of a deterioration resistant retaining wall block, which includes a securing apron that has interlocking slots.  
         [0043]      FIG. 10   a  is a side view of a deterioration resistant retaining wall block, which includes a securing apron that extends forward.  
         [0044]      FIG. 10   b  is a side view of a deterioration resistant retaining wall block, which includes a securing apron that extends forward and is offset from the front panel.  
         [0045]      FIG. 10   c  is a side view of another embodiment of a deterioration resistant retaining wall block, which includes a securing apron that extends forward and a hooking device.  
         [0046]      FIG. 10   d  is a side view of a deterioration resistant retaining wall block, which includes a retaining flange.  
         [0047]      FIGS. 11   a  and  11   b  are perspective views of top cover embodiments used to cap a deterioration resistant retaining wall block.  
         [0048]      FIGS. 12   a  and  12   b  are perspective views of bottom cover embodiments used to seal a deterioration resistant retaining wall block.  
         [0049]      FIG. 13  is a perspective view of an embodiment of a deterioration resistant retaining wall block that includes a top cover with a planter aperture.  
         [0050]      FIG. 14  depicts a perspective view of a multi-unit deterioration resistant retaining wall block.  
         [0051]      FIG. 14   a  depicts a perspective view of a single unit or partial block of a multi-unit deterioration resistant retaining wall block after division of the block.  
         [0052]      FIG. 15  depicts a perspective view of an embodiment of the present invention formed into a partial block.  
         [0053]      FIG. 16  depicts a top view of a multi-unit deterioration resistant retaining wall block with disengaging tabs.  
         [0054]      FIG. 16   a  depicts a front view of a multi-unit deterioration resistant retaining wall block.  
         [0055]      FIG. 17  depicts a front view of a deterioration resistant retaining wall constructed of multi-unit deterioration resistant block and having a colored and textured front panel.  
         [0056]      FIG. 18  depicts a top view of a multi-unit deterioration resistant retaining wall block comprising a plurality of front, side and back panels.  
         [0057]      FIG. 19  depicts a top view of a deterioration resistant retaining wall row that includes a plurality of blocks that have interlocking pegs and hinges.  
         [0058]      FIG. 20  depicts an exploded perspective view of the deterioration resistant retaining wall block that includes pegs and hinges.  
         [0059]      FIG. 21  depicts a side view of an embodiment of a deterioration resistant retaining wall block having an aperture for accepting an interlocking spool.  
         [0060]      FIG. 22  depicts a perspective view of an embodiment of the deterioration resistant retaining wall block of the present invention that is secured with a clipping device.  
         [0061]      FIG. 23  depicts a perspective view of an embodiment of the deterioration resistant retaining wall block of the present invention that is secured with a integral hook.  
         [0062]      FIG. 24   a  depicts a perspective view of more than one stackable deterioration resistant retaining wall blocks in nesting positions.  
         [0063]      FIG. 24   b  depicts a perspective view of more than one stackable deterioration resistant retaining wall panel blocks without the front panel in nesting positions.  
         [0064]      FIG. 25   a  depicts a perspective view of an embodiment of a deterioration resistant retaining wall block including a structural stabilization grid.  
         [0065]      FIG. 25   b  depicts a perspective view of a deterioration resistant retaining wall including a structural stabilization grid and block having a textured and designed front panel.  
         [0066]      FIG. 26  depicts one embodiment of a row of capping blocks.  
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0067]     The embodiments of the present invention described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art can appreciate and understand the principles and practices of the present invention.  
         [0068]      FIG. 1   a  depicts one embodiment of the deterioration resistant retaining wall block  10  comprising a front panel  12 , a back panel  14  and one or more side panels  16 . The side panels  16  of this embodiment operably join the front panel  12  and back panel  14  to form a retaining wall block  10  having a continuous flow chamber  18 . The continuous flow chamber  18  is positioned within the front panel  12 , back panel  14  and side panels  16 .  
         [0069]     It is noted that various embodiments of the retaining wall block of the present invention include no top panel or a partial top panel and no bottom panel or a partial bottom panel, thereby providing an open top and bottom to allow for the substantially uninhibited flow and/or commingling of fill material from one block to adjacent blocks above and/or below in the continuous flow chambers when such blocks are operably adjoined or positioned in proximity to each other. In other embodiments, the bottom panel may include one or more apertures to allow for at least a partial alignment of openings, thereby allowing the flow and commingling of fill material from one block to blocks positioned above and/or below.  
         [0070]     In an alternate embodiment, as depicted in  FIG. 1   b,  the retaining wall block  10  may comprise a beveled front that includes one or more bends, slants or creases in the front panel  12 .  FIG. 1   b  depicts one embodiment of the retaining wall block of the present invention, wherein the front panel  12  is beveled thereby taking on a tri-panel appearance. It is noted that the front panel  12  may also be rounded rather than beveled to provide a more natural appearance. Similar to the embodiment depicted in  FIG. 1   a,  the open top and bottom of each retaining wall block  10  that includes the beveled front panel  12  also allows for the receiving of fill material that may flow through the block  10  and commingle with the fill material in one or more adjacent blocks positioned above and below.  
         [0071]     Other embodiments of the present invention, as depicted in  FIGS. 2   a - 2   c  include retaining wall blocks in a panel block design. Similar to the retaining blocks of  FIGS. 1   a  and  1   b,  the panel blocks of the present invention generally comprise a front panel  12 , a back panel  14  and one or more side panels  16 . However, rather than an integral joining of all panels, the panel blocks  20  include two or more separated panels that are operably connected with one or more securing mechanisms  22  to join the two or more panels, thereby forming the block  20 . In other embodiments the panel blocks  20  require securing mechanisms  22  to join three or more panels to form the panel block  22 . Also, in still other embodiments, the panel block  20  of the present invention requires securing mechanisms  22  to join four or more separated panels to form the panel block  20 . In many of these embodiments, the side panels  16  are operably joined to the front panel  12  and back panel  14  with two or more securing mechanisms  22  to form a continuous flow chamber  18  within the panel block  20 . Similar to the retaining wall blocks  10  described above, the continuous flow chamber  18  of the panel block is positioned within the front panel  12 , back panel  14  and side panels  16 .  
         [0072]     In other embodiments, the panel block  20  may also include a front panel  12  that is beveled (e.g. beveled to take on a tri-panel appearance). It is noted that the front panel  12  of the panel block  20  may also be rounded or provided in other shapes rather than beveled as depicted in  FIGS. 2   a  and  2   b.    
         [0073]     As previously mentioned, the panel blocks  20  generally include one or more securing mechanisms  22  that provide a sufficient means for securing the separated panels to each other. A sufficient means is generally one wherein the panels will not release when the force of the fill material is applied to the panels  12 , 14 , 16  of the panel block  20 .  FIG. 3   a  depicts one side panel  16  that includes part of a securing mechanism  22  that may be utilized to form a panel block  20  similar to that depicted in  FIG. 2   a.  It is noted that the panel or variations thereof, depicted in  FIG. 3   a,  could also be utilized as a front panel  12  or back panel  14 . The securing mechanism  22  of some embodiments includes a T-hook positioned at one or more ends of the panel  16  that fits securely into a T-slot positioned on an adjacent panel  12 ,  14 , or  16 . By inserting a T-hook into a T-slot, one corner of a panel block  20  is thereby formed.  
         [0074]     In another embodiment, as depicted in  FIG. 3   b,  the panel  16  includes a securing mechanism  22  including a series of threads  24  that are part of a peg and socket system. It is noted that the panel  16  depicted in  FIG. 3   b  could also be utilized as a front panel  12  or back panel  14 .  FIG. 2   b  depicts one embodiment of the panel block  20  of present invention before the attachment of a front panel (not shown) wherein the side panels  16  are operably joined to the back panel utilizing a securing mechanism  22  that is one embodiment of a peg and socket system. In operation the panels  12 ,  14  and  16  are positioned so that threads  24  of each adjacent panel intertwine, thereby forming a slot that a peg or pin  26  can be inserted to secure the panels  12 , 14 , 16 . An exploded view of the securing mechanism  22  of this embodiment is depicted in  FIG. 2   c.  In this embodiment, the insertion of the pegs or pins  26  into the threaded sockets  24  secures the front panel  12 , back panel  14  and the side panels  16  together in a manner similar to a door hinge. It is noted that other peg and socket systems may be utilized to secure the panels when forming the panel blocks  20  of the present invention.  
         [0075]      FIG. 2   d  depicts another embodiment of the panel block  20  of the present invention wherein the block  20  includes side panels  16  and a back panel  14  that are formed or manufactured in a single part, thereby foregoing the need for one or more securing mechanisms to secure the side panels  16  with the back panel  14 . Such an embodiment has benefits in providing for additional stability of the block structure and the ability to manufacture the entire block  20  in a limited number of parts (e.g. two part system; a side/back panel and a front panel). Such embodiments allow for the side and back panels  14 ,  16  to be formed in a single part by processes that have manufacturing benefits, such as extrusion or thermoforming. Once the single side/back panel  14 , 16  is provided, it may be adjoined to a molded and/or fabricated front panel  12  by securing the pieces together with one or more securing mechanisms  22 .  
         [0076]     In yet another embodiment of the present invention a securing mechanism  22  may be provided as a hybrid of the T-hook and T-slot system and the peg and socket system. In such embodiments a peg  26  including a plurality of panel slots  28 , as depicted in  FIG. 4   a,  may be positioned to receive and secure two or more panels to form one or more corners of a panel block  20 . Examples of some peg and panel systems are depicted in  FIG. 4   b - 4   d.    
         [0077]     In still another panel block embodiment, the panels may include two or more slits to accommodate the securing of various panels together.  FIG. 3   c  depicts a side panel  16  of the present invention that includes a pair of slits  30 , one opening upward and one opening downward. It is noted that the embodiment depicted in  FIG. 3   c  and variations thereof could also be utilized as a front panel  12  and/or back panel  14 . In operation the slit  30  of a panel with a downward opening slit is inserted into the slit  30  of a panel having an upward opening slit. The nesting of the slits of the two panels forms a corner of one embodiment of the panel block  20  of the present invention. The remaining panels may then be joined in a similar fashion or with an alternative securing mechanism (not shown) to form the continuous chamber and a panel block embodiment.  
         [0078]      FIGS. 2   b  and  2   d  also depict embodiments of a panel block  20  of the present invention that include a stabilizing partition  32 . The stabilizing partition may be included in the retaining wall block  10  or panel block  20  to further stabilize the block structure, take pressure off of the front panel caused by the packed fill material and also provide a divider so that different fill materials may be added to the same block  10 ,  20  (e.g. a packing material toward the back of the block and a planting fill material in the front of the block). In various embodiments the stabilizing partition  32  may take a form similar to a side panel or back panel that includes attachment members  34  (e.g. T-hooks, pegs . . . ) positioned on the ends to act as part of the securing mechanisms  22 . In some embodiments the partition  32  may include peg extensions  36  that operate as a block positioning and securing means when constructing a retaining wall. The peg extensions  36  may be placed anywhere on the partition including the ends and/or dispersed along the bottom edge of the partition  32 . In construction of a wall, the peg extensions  36  may butt up against one or more partitions present in blocks positioned below, thereby holding the block  20  in position and providing an indication of proper positioning of the block  20 . It is noted that the peg extensions  36  may be included on the back panel  16  rather than or in addition to the partition  32  so as to butt up against the back panel of the blocks positioned below. Such peg extensions may be utilized in integral blocks  10  (blocks with no securing mechanisms) or panel blocks  20 .  
         [0079]     In the blocks of the present invention, including the panel blocks  20 , the front panel  12  will generally include a molded and/or fabricated texture and/or pattern in the deterioration resistant material that is visible to an observer. In various embodiments of the present invention the exposed surface of the front panel  12  will have a natural earthen appearance simulating the texture and color of natural earthen surfaces. For example, the exposed surface of the front panel  12  may be textured and colored to have the appearance of rock, stone, sand, soil, clay, wood, trees and foliage, water, or any other natural earthen appearance. Additionally, in other embodiments, the exposed surface of the front panel  12  may further include one or more designs (e.g. symbols, company names, logos, images) that may be positioned in the natural earthen appearance texture and color (e.g. a company logo embedded in a stone color and texture). Also, in other embodiments of the present invention, the front panel  12 , as depicted in the  FIG. 5 , may further include a design, such as the appearance of multiple bricks, stones, or blocks. This allows for the installation of larger blocks in a wall that appears to include a multitude of bricks, stones or blocks.  
         [0080]     As previously indicated the blocks  10 ,  20  of the present invention generally include one or more side panels  14  that engage and extend from the front panel  12  back to engage with a back panel  16 . As depicted generally in  FIGS. 1   a,    1   b  and  2   a - 2   c,  in some embodiments of the present invention, the side panels  14  engage the front panel  12  at angles to provide for a tapering of the block as it moves back in width. The angle  38  formed between the front panel  12  and side panel  14  is generally less that 90° when the front panel  12  is substantially straight and less than 150° when the front panel  12  is rounded or beveled. In other embodiments, the angle  38  is between about 45° and 85° for substantially straight front panels  12  and between 60° and 120° for beveled and rounded front panels  12 . In various embodiments the side panels  14  may extend from the front panel  12  at angles that would allow them to engage each other at the back of the block, thereby forming the back panel  16  and chamber  18  by their engagement (e.g. a triangle or diamond configuration). Finally, in various embodiments, the top edge of the side panels  14  may slightly slope down from front to back, thereby providing a back end of the block that is slightly lower than the front of the block (e.g. 0.5-10 mm).  
         [0081]     In other embodiments, as illustrated in  FIGS. 6   a  and  6   b,  the retaining wall block  10  further includes an optional partial top panel  40  that is exposed when a retaining wall is constructed. The partial top panel  40  assists to close or partially close the top front portion of the block  10 ,  20  that may be exposed to the outer environment. In the embodiment depicted in  FIG. 6   b,  the top panel  40  further includes a protrusion  42 , which is intended to fill the void created by the beveled front panel  12  when constructing a retaining wall that includes staggered rows of such blocks  10 . See  FIGS. 7   a  and  7   b  for a depiction of a perspective view of a retaining wall  44  including staggered rows. In various embodiments, the blocks  10 ,  20  include a partial top panel  40  that extends from the front panel  12  back to no more than 75% of the width of the block. It is noted that block width is measured from the front panel  12  to the back panel  14  of the block. In other embodiments of the present invention, such a partial top panel extends from the front panel no more than 50% of the width of the block. In yet other embodiments the partial top panel  20  extends from the front panel no more than 35% of the width of the block. Such a partial top panel  40  provides for at least a partial sealing of the block at the top front portion, of which may be exposed when the retaining wall is constructed in a configuration wherein the wall inclines back toward the surface or slope intended to be protected. It is noted that in various embodiments the top panel  40  may further include one or more planting apertures  46  that may allow plant growth from the top surface of the block. As previously suggested, the open top and bottom of each retaining wall block  10 ,  20  allows for the receiving and commingling of fill material that may flow from and through the block  10 ,  20  to one or more adjacent blocks  10 ,  20  below.  
         [0082]     A partial top panel  40  may also be incorporated into embodiments of the front panel  12  utilized in embodiments of the panel blocks  20  of the present invention.  FIG. 8   a  depicts a front panel  12  of a panel block  20  wherein the partial top panel  40  extends back from the front edge of the panel block  20 . The partial top panel  40  of this embodiment further includes optional top side panels  48  that extend downward from the partial top panel  40  and may extend over or within the side panels  16  of the panel block (not shown). The partial top panel  40  of  FIG. 8   a  further includes one or more cover tabs  50  to assist in securing the top panel  40  into the fill material or over a partition (not shown). The partial top panel  40  may also include one or more planting apertures  46 , as depicted in  FIG. 8   b,  that allows for the growth of plants from the top of the panel blocks  20 . Also, various embodiments may also include more than two securing mechanisms  22  as depicted in  FIG. 8   a.  This is advantageous if partial blocks are required, as will be explained further below. By providing additional securing mechanisms  22 , the cutting of the front panel  12  still allows for the remaining portion of the front panel  12  to have two outer securing mechanisms  22  for securing a side panel to the cut front panel. Partial blocks may further include one or more shorter stabilizing partitions (not shown) to assist in securing the two halves of the block together after cutting and provide addition stability to the partial block.  
         [0083]      FIGS. 9   a  and  9   b  depict a front perspective view of two embodiments of the present invention wherein the retaining wall block  10  of the present invention further includes one or more anchoring devices for securing each block to adjacent blocks or securing them into position in the retaining wall. Generally the anchoring devices may be adjoined, rested within or inserted into the top panel  12 , back panel  14  and/or side panels  16 . For example, as depicted in  FIGS. 9   a  and  9   b  the anchoring devices include one or more securing aprons  52  adjoined to the front panel  12 , side panels  14  and/or back panels for interconnecting the stacked blocks  10  and assisting the flow of fill material within the continuous chambers  18  of the blocks. As depicted in  FIGS. 9   a  and  9   b,  the aprons  52  may include a plurality of teeth  54  that extend downward from one or more of the various panels  12 ,  14 ,  16  into the adjacent blocks  10  below, thereby adjoining the blocks  10  and formulating the continuous chamber system. The aprons  52  generally secure the block into place and inhibit leakage of the fill material when it is poured into and retained within the chambers  18 . The teeth  54  of the present invention allow for indentations between the teeth  54  that may accommodate the side panels  16  of adjacent blocks  10  below. The indentations further provide for a secure and flush fit of the adjoining blocks  10 . Also, it is noted that individual teeth may be removed or cut away to further assist the proper fit of blocks in the wall.  
         [0084]     In another embodiment of the present invention, as depicted in  FIG. 9   c,  the aprons  52  include one or more slots  56  configured to accept one or more interlocking members  58 , which are positioned on the top panel  400 . The interlocking members  58  extend inwardly from the edge of the top panel  40  a length sufficient to pass through the slots  56  of the adjacent blocks  10  positioned above.  
         [0085]     In an alternate embodiment of the present invention the apron  52  adjoined to the front panel  12  may extend forward. See  FIGS. 10   a - c.  The extension of the apron  52  forward allows for a secure locking of adjacent blocks by inserting the forward extending apron  52  under the top ledge  40  of the adjacent blocks  10  below.  FIG. 10   b  depicts the apron  52  offset from the front panel  12  of the block  10 . In such embodiments, the apron  52  would be secured to a bottom panel (not shown). The bottom panel may be secured to the front panel  12  and side panels  16  or hingedly attached to the front panel  12 . Such an offset apron  52  allows for the bottom panel to partially extend over the top panel  40 , thereby further assisting in sealing the continuous chamber from the environment in front of the wall.  
         [0086]     In one embodiment of the present invention, as depicted in  FIGS. 10   a  and  10   b,  an apron  52  may attached to an extension  60  of the back panel  14 . The extension  60  may be adjoined to and extend along the back panel  14  in a manner that would allow it to rotate or swing inward, thereby allowing the apron  52  to engage the back panel  14  of the adjacent blocks  10  below. The extension  60  may be adjoined to the back panel  14  by any means known in the art, such as hinges (e.g. living hinge), hooks, flexible plastic portions, perforations or any other means that would allow the extension  60  to swing inward.  
         [0087]     In an alternate embodiment depicted in  FIG. 10   c  the back panel  14  includes one or more hooking devices  62 . The hooking devices  62  are adjoined to the back panel  14  similar to the extensions  60  of  FIGS. 10   a  and  10   b.  Generally, the hooking devices  62  are capable of swinging inward and engaging the back panels  14  of adjacent blocks  10  below. One or more apertures (not shown) may be positioned on the top portion of the back panel  14  to accept the hooking device  62  and thereby lock the blocks  10 ,  20  in place. Examples of hooking devices include but are not limited to latch hooks, clips, snaps and the like.  
         [0088]     The back panel  14  may also include or be adjoined to a flange  64 .  FIG. 10   d  depicts the side view of an embodiment of the present invention, which includes a retaining flange  64  adjoined to the back panel  14  of the block  10 ,  20 . On a constructed wall, each retaining flange  64  is a wall retention device that operates to inhibit outward movement of the wall. Normally, the retaining flange  64  extends downward from the back of the back panel  14  and rests against the back of the retaining block  10 ,  20  located below. The retaining flange  64  may be a unitary piece extending downward from the back of the retaining block  10 ,  20  or a series of fingers (not shown) extending downward from the back of the retaining block  10 . Optionally, a clipping member  66  may be included in proximal location to the flange  64 , thereby forming a clip that can accept and retain the upper portion of the back panel  14  of the blocks  10 ,  20  below.  
         [0089]      FIGS. 11   a - 11   b  and  12   a - 12   b  depict various embodiments of top covers  68  and bottom covers  70 , which are configured and adapted to securely fit over or under embodiments of the retaining wall blocks  10  of the present invention. Generally, in some embodiments, the top covers  68  and bottom covers  70  utilized in constructing some of the retaining walls of the present invention are at the very top of the wall and very bottom of the wall to at least partially seal the continuous chamber channels. However, the use of such covers  68 ,  70  at intermediate locations through the wall may also be performed. In various embodiments of the present invention, the top cover  68  generally includes a continuous top panel  72  that includes overlapping edges  74 , which overlap securely over the outside side and back panels  14 ,  16 . In some embodiments of the invention, the overlapping edges  74  may be present around the entire perimeter of the top panel  72 . Alternately, a forward extending apron  52  may be positioned at the front of the top cover  68  and utilized to secure the cover  68  to the adjacent blocks  10 ,  20  below by inserting the apron  52  under the top panel  40  of said blocks  10 ,  20 .  
         [0090]     Embodiments of the bottom covers  70  of the present invention, as depicted in  FIGS. 12   a  and  12   b,  may include a bottom panel  76  with attached bottom side walls  78  extending around the perimeter of the bottom panel  76 . The side walls  78  may be configured to overlap the front, back and side panels (depicted in  FIG. 12   a ) or configured to nest within the front, back and side panels  12 ,  14  and  16  (depicted in  FIG. 12   b ). In other embodiments, as depicted in  FIG. 12   a,  the overlapping sides may include an optional channel  80  for receiving and retaining the front, side and back panels  12 ,  14 , and  16  of the adjacent block  10 ,  20  above. Finally, the front of the bottom cover  70  may include one or more apron apertures  82  opening to the side or bottom of the bottom cover  70  for receipt of an apron  52  from the adjacent block  10 ,  20  above. Alternatively, the top covers  68  and/or bottom covers  70  may include only a top panel  72  or bottom panel  76  that nest and optionally secure into place just within the front panel  12 , back panel  14  and side panels  14  of the block  10 ,  20 . Additionally, the top cover  68  may include one or more planting apertures  46  for allowing the growth of vegetation from the block. An illustration of one such embodiment is depicted in  FIG. 13 .  
         [0091]     Another embodiment of the present invention is depicted in  FIG. 14 . The embodiment shown in  FIG. 14  comprises a deterioration resistant retaining block  10 ,  20  wherein more than one chamber  18  is included within the retaining block  10 ,  20 . The multiple chambers  18  are defined by interior partitions  32  that may extend either the length and/or the width of the block  10 ,  20 . The interior partitions  32  may also be utilized to add additional support to the retaining block  10 ,  32  to prevent any possible crushing or expansion of the block  10 ,  20 . The interior partitions  32  are within the interior of the retaining block  10 ,  20  and are present to define separate chambers that can accommodate filling of each individual chamber  18  with appropriate fill material, such as sand, gravel, crushed rock, pea rock, soil, cement, concrete or any other suitable material.  
         [0092]     Multiple chambers  18  also allow for the retaining block  10 ,  20  to be cut into various shapes or into partial blocks and still maintain a chamber  18  that can receive and retain fill materials as illustrated in  FIG. 14   a.    FIG. 14   a  depicts a section of the retaining block  10 ,  20  as shown in  FIG. 14  wherein the block  10  has been cut in half. The ability to cut the retaining block  10 ,  20  and still retain the same features is particularly useful in preparing ends and awkward segments of retaining walls. In one embodiment, a block  20 , as depicted in  FIG. 2   b,  and a front panel  12 , as depicted in  FIG. 8   a,  may be cut to a desired width, and adjoined with a side panel to secure the front panel  12  to the back panel  14  of the block  20  utilizing an interior securing mechanisms  22  positioned on the front panel  12  and back panel  14 .  
         [0093]     In another embodiment, as depicted in  FIG. 15 a  partial block may be formed by cutting a retaining wall block  10 ,  20  and nesting the first front section  84  of the front panel  12  within the second front section  86  of the front panel  12  and nesting the second back section  88  within the first back section  90 . The nested partial block sections may be adjoined using any attachment means known in the art; for example clips, tacks, rivets, adhesives, securing mechanisms as described above, or combinations thereof. It is noted that the first front section  84  and either or both back sections  88 ,  90  may be trimmed to properly fit when nesting. Alternate top and bottom covers (not shown) configured to conform to the various shapes of a divided retaining block  10 ,  20  may also be provided or formed by cutting. As previously mentioned, partial blocks may further include one or more shorter stabilizing partitions (not shown) to assist in securing the two halves of the block together after cutting and provide addition stability to the partial block.  
         [0094]      FIG. 16  illustrates a top view of a retaining wall block wherein multiple units  92  are incorporated into a single block  94 . A single multi-unit block  94  provides the appearance of multiple retaining blocks present in a single structure and generally includes a front panel  12 , back panel  14  and two or more side panels  16  operably adjoined to form two or more chambers  18 . A top cover (not shown) or bottom cover (not shown) may be provided for a multi-unit block  94  and may include a single sheet or multiple sheets of material which covers each unit  92 . The interior of the retaining block  94  of this embodiment includes one or more interior partitions  32 .  FIG. 16   a  depicts the front view of the multi-unit retaining block  61 , which has the appearance of multiple separate units  92 . In various embodiments, the multiple multi-unit blocks  94  provide the appearance similar to the partial assembly of a retaining wall comprising a plurality of individual blocks, such as depicted in  FIG. 17 . The multi-unit retaining block  94  may be a unitary structure or may include multiple components, such as a multi-unit block  94  including individual top or bottom covers (not shown).  
         [0095]     Also, as depicted in  FIG. 16 , the multi-unit retaining wall block  94  may have disengaging tabs  96  positioned between each individual unit  92  on the front and back of the multi-unit block  94  for disconnecting units  92  of the block  94 . One example of the tabs  96  may be one or more thin sections of flexible or rigid plastic positioned between the units  92  that adjoin and separate each individual unit  92 . The units  92  can be separated or pushed together in the back to curve a wall by simply cutting or removing the tab  96 .  
         [0096]     In an alternate embodiment of the present invention, the multi-unit block  94  may include a plurality of panels, similar to those previously described in the explanation of the panel block  20  embodiments.  FIG. 18  depicts another embodiment of the multi-unit block of the present invention, wherein a plurality of front panels  12 , back panels  14  and side panels have been adjoined with securing mechanisms  22  to form a multi-unit block  94 .  
         [0097]      FIGS. 19-23  depict other embodiments of the present invention wherein the block  10  or panel block  20  include an interconnecting device  98 . It is noted that in the panel block  20  embodiments, the interconnecting device  98  may be a securing mechanism as described above or a variation thereof. In various embodiments, as depicted in  FIG. 20  the interconnecting device  98  includes a peg and socket system having one or more insertable pegs  26  to adjoin two or more blocks by inserting the pegs  26  into threads  24  that form a socket. The sockets are generally positioned on an edge or just inside the edge of the front, side and/or back panels  12 ,  16 ,  14 . The sockets may be integral to the front or back panels  12 ,  14  or may be secured to the panels  12 ,  16 ,  14  in any manner known in the art. The pegs  26  are configured to be securely receivable in the sockets and may be configured to swivel the block  10 ,  20 . The insertable pegs  26  can be made of any shape and size, which can be securely fit into the sockets.  
         [0098]     Another type of anchoring device included in the present invention may be a side locking mechanism. As depicted in  FIG. 21 , one or more interlocking spools  100 , each comprising an elongated member  102  operably adjoined to one or more flat cylinder  104  attached to one or more ends, may adjoin adjacent side blocks  10 . Each cylindrical end  104  of each spool  100  may be inserted into connecting apertures  106  positioned on the side panels  16  of adjacent blocks  10 ,  20  thereby securing them together.  
         [0099]     Alternatively, in one embodiment of the present invention side by side adjacent blocks  10 ,  20  may be adjoined with a clipping device  108 . In one embodiment the clipping device  108  my be configured in a U shape and sized to snuggly fit over the side panels  16  of two adjacent blocks. An illustration of one embodiment of a clipping device is depicted in  FIG. 22 .  
         [0100]      FIG. 23  depicts an additional embodiment of the present invention, similar to hook attachments, wherein the retaining wall block  10  or panel block  20  includes an interlocking feature that comprises a hook or peg  110 . An optional pocket (not shown) may also be placed in the block  10  for receiving the hook  110  from adjacent blocks  10 . In such an embodiment one or more hooks or pegs  110  extend from one side panel  16  of a retaining wall block  10 ,  20  and may be inserted over the opposite side panel  16  of an adjacent block  10 ,  20 . Such interlocking mechanisms provides for a overall secure retaining wall structure by reducing the amount of movement that may occur during filling with unsecured individual blocks.  
         [0101]     Another advantage of certain embodiments of the blocks of the present invention is that they also allow for easy storage and transport due to the stackable capabilities present.  FIG. 24   a  depicts a plurality of such blocks  10  in a stacked arrangement. For example, an individual block  10  may be inserted into chamber  18  of another block  10 , thereby creating a stackable arrangement.  
         [0102]     In other embodiments of the present invention, panel blocks are easily transported and stored by separating the front panel  12 , back panels  14  and side panels  16  and stacking and/or nesting the respective panels  12 ,  14 ,  16  when in transport or storage.  FIG. 24   b  depicts a plurality of panel blocks  20 , as depicted in  FIG. 2   b,  in a nested position.  
         [0103]     The blocks  10  of the present invention may also be utilized with other wall stabilizing products to secure and stabilize a structure constructed of such blocks  10 . For example,  FIG. 25  depicts an embodiment of a retaining wall block  10  wherein a structural grid  112  is attached to block  10  or panel block  20  (e.g. attachment to the upper back panel  14 , bottom panel (not shown or peg extensions  36  on the back panel  14  or partition  32 ). The grid  112  is buried behind the wall constructed of the blocks of the present invention and acts to support and stabilize the wall from moving forward away from the embankment it is protecting.  FIG. 25   b  depicts an additional embodiment of the grid  112  positioned between the rows of a retaining wall that includes the block  10 ,  20 ,  94  of the present invention having a textured front panel  12  and a molded or fabricated design.  
         [0104]     As previously mentioned, the present invention may be manufactured from a deterioration resistant, substantially rigid composite or polymeric material including, but not limited to, plastic, a rubber composition, fiberglass, or any other similar material or a combination thereof. Preferable materials comprise light-weight and slightly flexible polymers, such as high and low density polyethylene. However, other plastics may also be used. Examples of other plastics include, but are not limited to polypropylene, acrylonitrile-butadiene-styrene (ABS), poly(butylene terephthalate) (PBT), poly(cyclohexanedimethylene terephthalate) (PCT), styrene-acrylonitrile copolymers (SAN), polystyrene, polycarbonate and combinations thereof. It is also noted plastics the include filler materials, such as saw dust or paper byproducts may also be used in the present invention. Generally, the embodiments of the present invention may comprise any type of material that would have the similar characteristics to plastic, vinyl, silicone, fiberglass, rubber or a combination of these materials. It is noted that the material utilized in the present invention should be rigid enough to hold its form upon addition of filling material and also when placed in contact with other objects. Also the panels of the blocks should be substantially non-collapsible when in a filled and stacked state. Another preferable material may be comprised of a material similar to that utilized in the production of some types of garbage cans or the utilization of recycled rubber from objects such as tires. Such materials would be capable of holding rigidity and still offer flexibility when placed in contact with other objects, such as ice. Also, such materials have the ability to regain its original form when the object or material has been removed.  
         [0105]     Embodiments of the present invention may also vary in appearance. Since embodiments of the present invention may be manufactured by a process such as injection molding, extrusion, thermo-forming, compression molding, roto-molding and the like, the molds may include any type of design or shape. Furthermore, the front panels of the retaining wall block  10  or  20  could be molded in almost any type of configuration. In one embodiment, multiple retaining wall blocks could be molded to include designs that, when positioned on a retaining wall, would complete a larger single design, such as the spelling of a company or school name in large letters or the completion of a large image. Also, since the present invention may be manufactured from a number of different products, such as plastic, a rubber composition or fiberglass, the retaining wall block may comprise any color or a multitude of colors. For example, a retaining wall installed in a beach setting may be manufactured of a plastic or rubber product and be colored in so that organic matter wash up on it would not show up as readily or may take on the appearance of sand.  
         [0106]     As previously suggested the environment resistant retaining wall block is utilized in the construction of any type of wall or border. In application, the blocks  10  or panel blocks  20  are provided in a usable form. For the blocks  10  no additional preparation may be required. However, for the panel blocks  20 , some assembly may be required. Next, a foundation is created in the area that the wall or border is to be constructed. The foundation preferably is flat and or level and can accommodate one or more retaining blocks  10 . In various embodiments one or more courses of block  10 ,  20  may be partially submerged or totally submerged below the earth surface to provide wall stability. Once a foundation is completed, a first row is laid by positioning the blocks  10 ,  20 ,  94  in their proper position side by side and filling each retaining block  10   20 ,  94  with a fill material while back filling behind the block until the row is completed. A fill material packing device may be utilized while filling to ensure stability of the fill material as the wall is constructed. The chamber  18  is normally filled with materials such as sand, crushed rock, pea rock, gravel, dirt, cement, concrete or other like materials to provide weight and structure stability to the retaining wall block  10  and the entire retaining wall. The filling of the retaining wall block  10  gives it the added weight that it needs to retain its structure and hold it in place. A funneling device may be utilized, which fits securely into the openings or apertures of the retaining wall block to guide fill into the chamber of the block. The first row and subsequent rows may be straight or rounded. Upon completion of the first row, additional rows are constructed by placing the retaining wall block  10  in the proper position and performing the same filling and back filling process until a continuous retaining wall is completed. It is noted that with the continuous chamber of the present invention, multiple rows can be secured in place before filling. However, it is recommended that filling be done regularly (e.g. row by row) to ensure proper packing of the fill material. Generally, a continuous retaining wall includes stacked rows wherein individual retaining blocks are placed adjacently to one another thereby eliminating or minimizing cracks or gaps in the wall. Rows of retaining wall blocks  10  may be positioned directly over other rows of retaining wall blocks  10  wherein the blocks are positioned directly over other blocks. However, many embodiments of the present invention provide a constructed wall wherein the blocks are staggered in alternating rows. See  FIG. 7   a  and  7   b  for an illustration of a staggered retaining wall. It is noted that each retaining wall block  10 ,  20 ,  94  placed in the retaining wall is configured to retain and seal the contents of the fill material back towards the slope when the wall has been properly constructed. This may be further accomplished by applying top covers  42  and/or bottom covers  44  that at least partially seal the continuous chamber or by plant vegetation on the top row of the retaining wall. Furthermore, the retaining wall blocks  10 ,  20 ,  94  of the upper rows may be further sealed into place by an overlap of the back of retaining wall blocks  10 ,  20 ,  94  of lower rows if a retaining flange  64  or peg extensions  36  are included on the block. In the alternative or additionally, each individual retaining block  10  may be locked into position with adjacent blocks if spools  100  and apertures  106 , clipping devices  108  or hooks  110  are present with the retaining block  10 ,  20 ,  94 .  
         [0107]     Upon completion of the top row of the retaining wall, a cover or capping block  114  may be placed over the top row to close and seal the continuous chamber of the retaining wall and to provide a finishing border to the top of the retaining wall. One embodiment of a capping block  114 , as depicted in  FIG. 26 , may be polygonal in shape and include textured and designed faces on both the front panels  12  and back panels  16  of the block  114 . The capping blocks  114  may further include pegs (not shown), similar to those depicted in the previous block embodiments, that may be utilized to secure the capping block to the blocks positioned below. Alternatively, the capping blocks may be secured to the blocks  10 ,  20 ,  94  below by any means known in the art, such as clips, tacks, adhesives or the like. The capping blocks  114  may be filled with a fill material, similar to the other embodiments of the present invention, or may be a simple thinner block that may include a plurality of reinforcing partitions  116  as disclosed in  FIG. 26 .  
         [0108]     Embodiments of the present invention may also be used in conjunction with regular dry cement process blocks, bricks or stones, such as those produced by Keystone® or Anchor® Wall Systems. A retaining wall constructed in water or along a waterfront property may utilize the retaining wall block of the present invention at water level and below and then the regular keystone or retaining wall materials can be used on top of the retaining wall block of the present invention. The utilization of the retaining wall block of the present invention would be easy to match colors with the conventional retaining wall building materials because the materials utilized to manufacture the present invention can be colored and designed to match virtually any type of retaining wall construction material.  
         [0109]     Furthermore, the retaining wall block may be manufactured in a multitude of different sizes, shapes and configurations. For example, an embankment or steep shoreline could support a retaining wall configured in a step like arrangement or design. Such a structure, may be utilized as a retaining wall and/or a stairway down to the beach or to the water.  
         [0110]     While the invention has been illustrated and described in detail in the drawings and foregoing description, such an illustration and description is to be considered as exemplary and not restrictive in character, it being understood that only the preferred embodiments have been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.

Summary:
The present invention relates to a retaining wall block that is resistant to damage and wear caused by the environment and includes a chamber, which allows the flow of fill material to adjacent blocks below and above. The deterioration resistant block is generally a hollowed frame or shell of a deterioration resistant material that is light-weight and is configured to interlock with adjacent blocks, thereby forming a continuous chamber capable of accepting and retaining any type of filling material. The filling material provides weight, stability and security to a retaining wall constructed of such blocks.