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FIELD OF THE INVENTION 
   This invention relates generally to a low profile enclosure constructed of plastic structural panels. More specifically, the present invention relates to a low profile enclosure which includes telescoping roof panels. 
   BACKGROUND INFORMATION 
   Storage sheds are a necessity for lawn and garden care, as well as general all-around home storage space. Typically, garden tools and equipment are found either stacked into a corner of the garage, or bundled together and covered with a tarpaulin to protect them from the elements. During the off-seasons, lawn mowers, tillers and snow equipment often consume the available floor space of a garage, forcing the homeowner to park his/her automobile outside. 
   The prior art has proposed a number of different panel systems, or kits comprising blow molded or extruded panels and connector members for forming a wide variety of structures. Typically such systems are assembled into structures having a height sufficient to allow the owner to walk into the structure. Generally, such systems require extruded metal or plastic connector members having a specific cross-sectional geometry that facilitate an engagement between such members and one or more blow molded plastic panels having a complimentary edge configuration. Due to the nature of the manufacturing process, blow molded plastic components cannot be formed with the intricate shapes and/or sharp corners required for integrated connectors. In addition, blow molded plastic components are hollow and cannot be formed with the integral strengthening ribs and gussets possible with injection molding. 
   A particularly common structure for the connector members is the I-beam cross section. The I-beam defines free edge portions of the connector member which fit within appropriately dimensioned and located slots in the panel members. U.S. Pat. No. D-371,208 teaches a corner extrusion for a building sidewall that is representative of the state of the art I-beam connector members. The I-beam sides of the connector engage with the peripheral edge channels of a respective wall panel and thereby serve to join such panels together at right angles. Straight or in-line versions of the connector members are also included in the kits to join panels in a co-planar relationship to create walls of varying length. 
   The aforementioned systems can also incorporate roof and floor panels to form a freestanding enclosed structure such as a utility shed. U.S. Pat. Nos. 3,866,381; 5,036,634; and 4,557,091 disclose various systems having interfitting panel and connector components. 
   Such prior art enclosure systems, while functional, nevertheless fail to meet longfelt needs of consumers to provide structural integrity combined with modularity and aesthetic appearance. The walk-in structures may be undesirable or unsightly where the roofs are visible over neighborhood fences or hedges. In some areas homeowner associations may not permit structures having an adequate height to allow the owner to walk into the enclosure due to the unsightly nature of the visible roof tops. 
   Paramount among such needs is a telescoping roof and pivoting door combination which allows items such as lawn tractors to be driven into the enclosure. Telescoping roof panels allow a low profile enclosure while still allowing an owner to walk into the enclosure for easy access to the contents. From a structural standpoint, the telescoping roof should be capable of easy installation after assembly of the wall and floor components, and be compatible with the walls. The wall and floor components should utilize a panel system which eliminates the need for panel connectors creating enclosure walls which resist panel separation, buckling, racking and weather infiltration. 
   There are also commercial considerations that must be satisfied by any viable low profile enclosure system or kit; considerations which are not entirely satisfied by state of the art products. The enclosure must be formed of relatively few component parts that are inexpensive to manufacture by conventional techniques. The enclosure must also be capable of being packaged and shipped in a knocked-down state. In addition, the system must be modular and facilitate the creation of a family of enclosures that vary in size but which share common, interchangeable components. 
   Finally, there are ergonomic needs that an enclosure system must satisfy in order to achieve acceptance by the end user. The system must be easily and quickly assembled using minimal hardware and requiring a minimal number of tools. Further, the system must not require excessive strength to assemble or operate. Moreover, the system must assemble together in such a way so as not to detract from the internal storage volume of the resulting enclosure, or otherwise negatively affect the utility of the structure. 
   BRIEF DESCRIPTIONS OF THE INVENTION 
   The present invention provides a system, or kit, of injection molded panels having integrated connectors which combine to form an enclosure, commonly in the form of a low profile utility enclosure. The enclosure is provided with a telescoping roof panel and pivoting doors which allow easy and dependable access to the interior of the enclosure. The system incorporates a minimum number of components to construct a low profile enclosure by integrally forming connectors into injection molded panels. The panels utilized to construct the low profile enclosure are formed of injection molded plastic and include sockets which accept both roof and floor locking posts for interlocking cooperative engagement which serves to rigidly connect the components together. 
   This minimizes the need for separate extruded or molded connectors to assemble the low profile enclosure. The symmetry of the wall, roof, floor and door components also minimizes component shapes and simplifies enclosure construction. Injection molding the wall panels allows them to be formed with adequate height to eliminate the need for stacking panels to achieve the desired height. Injection molding also allows the panels to be formed with integral cross-bracing, ribs and gussets for increased rigidity when compared to blow molded or extruded panels. 
   In one embodiment the enclosure system utilizes three types of wall panel construction for the side walls, expansion of the side walls, and the rear wall assembly. The embodiment also utilizes one construction of fixed roof panel, one construction of sliding roof panel, and one construction of floor panel. The system further includes a door assembly which utilizes two types of panels and slides into place after the walls and roof have been fully assembled. The floor of the system is constructed to allow optional wooden or plastic floor joists to be added to the plastic floor panels further increasing the structural integrity of the enclosure. The same components are used to create sheds of varying size and the assembly of the system requires minimal hardware and a minimum number of hand tools. 
   Accordingly, it is an objective of the present invention to provide a modular panel system having integrated connectors for creating low profile enclosures of varying dimension using common components. 
   A further objective is to provide a modular panel system for creating low profile enclosures wherein the panels include integrated connectors which accommodate injection molding plastic formation of the panel components for increased structural integrity. 
   Yet a further objective is to provide a low profile enclosure constructed from modular panels in which the side walls, roof, and floor are integrally interlocked without I-beam connectors. 
   Another objective is to provide a low profile enclosure constructed of modular panels having a roof assembly which allows a portion of the roof to be telescopically retracted and extended. 
   Other objectives and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention. The drawings constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof. 

   
     BRIEF DESCRIPTION OF THE FIGURES 
       FIG. 1  is a perspective view of a low profile enclosure constructed using the instant enclosure system; 
       FIG. 2  is an exploded view of the enclosure shown in  FIG. 1 ; 
       FIG. 3  is a perspective view of one embodiment of the floor assembly utilized in the instant invention; 
       FIG. 4A  is a perspective view of the floor assembly illustrating the optional wooden floor joists; 
       FIG. 4B  is a perspective view of the floor assembly illustrating the sliding engagement of the floor panels; 
       FIG. 5  is a bottom view of the floor assembly illustrating the cross-bracing; 
       FIG. 6  is a partial perspective view illustrating assembly of the first left side wall panel to the floor assembly; 
       FIG. 7  is a partial perspective view further illustrating assembly of the left side wall panels; 
       FIG. 8  is a partial cross sectional view illustrating the locking engagement between the dowel and adjacent wall panels; 
       FIG. 9  is a partial perspective view illustrating assembly of the rear wall panels; 
       FIG. 10  is a partial perspective view further illustrating assembly of the rear wall panels; 
       FIG. 11  is a partial perspective view illustrating assembly of the right side wall panels; 
       FIG. 12  is a partial perspective view further illustrating assembly of the right side wall panels; 
       FIG. 13  is a perspective partially exploded view of the roof panels utilized in the instant invention; 
       FIG. 14  is a perspective view of the bottom surface of the telescoping roof panel utilized in the instant invention; 
       FIG. 15  is a perspective view of the bottom surface of the fixed roof panel utilized in the instant invention; 
       FIG. 16  is a front view illustrating the door assembly utilized in the instant invention; 
       FIG. 17  is a perspective view illustrating the installation of one of the doors; 
       FIG. 18  is a partial perspective view of the enclosure with enlarged partial views illustrating assembly of the door hinges utilized in the instant invention; 
       FIG. 19  is a partial perspective view of the enclosure with enlarged partial views illustrating assembly of the door hinges utilized in the instant invention; 
       FIG. 20  is a partial view illustrating assembly of one of the door latch housings utilized in the instant invention; 
       FIG. 21  is a partial view illustrating assembly of one of the door latch pins utilized in the instant invention; 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   While the present invention is susceptible of embodiment in various forms, there is shown in the drawings and will hereinafter be described a presently preferred embodiment with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiments illustrated. 
     FIGS. 1 and 2  which are now referenced show an isometric and exploded view of the low profile enclosure, generally referenced as  10 , according to a preferred embodiment of the present invention. The enclosure is made up of a floor assembly  100 , left and right side wall assemblies  200 , rear wall assembly  300  ( FIG. 2 ), roof assembly  400  and door assembly  500 . In the preferred embodiment, the panels comprising the assemblies are formed of, but not limited to, a suitable polymeric material through the process of injection molding. The result is that the panels comprising the floor  100 , walls  200 - 300 , roof  400 , and doors  500  of the enclosure  10  are formed as unitary panels with integral connectors and cross bracing. Strengthening ribs  204  and gussets  206  ( FIG. 2 ) are formed within the inner surfaces of the wall panels  202 ,  203 ,  302  and  502  in order to enhance rigidity of the panels while leaving the external surface in a generally smooth condition for aesthetic purposes, as shown in  FIG. 1 . The panels are utilized to construct the floor assembly  100 , left and right wall assemblies  200 , rear wall assembly  300 , door assembly  500 , and roof assembly  400  using a minimal number of components. 
   Referring to  FIGS. 3-5 , the enclosure includes a pair of like-constructed floor panels  102 . Each panel has a top surface  104 , bottom surface  106 , locking edge  108 , ramp edge  110 , and two closed edges  112  and  114 . Adjacent to each of the closed edges is a means of attaching the floor assembly to the wall assemblies illustrated as a plurality of locking posts  116  extending upwardly from the top surface  104 . The locking posts  116  are constructed and arranged to cooperate with sockets  210  ( FIG. 7 ) located at each longitudinal end of the first, second, and third structural wall panels  202 ,  302  and  203  respectively. Adjacent to each of the ramp edges  110  is a pair of generally cylindrical hinge pins  128  extending upwardly. The hinge pins  128  cooperate with the door panels  502  to allow pivotal movement. A series of spaced apart tubes  118  extend through each floor panel  102  under the top surface  104  and between the locking edge  108  and the ramp edge  110 . The tubes  118  are sized to accept optional wooden floor joists  120  (FIGS.  4 A, 4 B) adding increased weight capacity and stability to the enclosure  10 . Along the locking edge  108  of each bottom panel  102  is a series of spaced apart fingers  122  and recesses  124  for attaching the panels together into a floor assembly  100 ; each of the fingers being provided with at least one countersank aperture for receiving a fastener (not shown). The fingers  122  and recesses  124  are constructed and arranged so that the fingers  122  overlap and mateably engage the recesses  124  and the fasteners secure the panels together in an inter-fitting engagement with their respective top surfaces  104  in a co-planar arrangement. The bottom surface  106  ( FIG. 5 ) illustrates the cross-bracing  128  facilitated by injection molding of panels. Injection molding offers significant strength and stability advantages over blow-molding as utilized in the prior art. In this manner the enclosure of the instant invention is capable of handling a significant amount of weight as compared to blow molded enclosures. 
   Referring to  FIGS. 6-7  a first structural side wall panel is shown. The first structural wall panel  202  constitutes one of a plurality of like-configured panels in the system used to construct the left and right side wall assemblies  200 . The first structural wall panels  202  are each configured having a first longitudinal end  208  including an integrally formed attachment means illustrated as a plurality of sockets  210 . A second longitudinal end  212  also including an integrally formed attachment means also illustrated as a plurality of sockets  210 . The sockets  210  are generally constructed and arranged to cooperate with either a floor assembly  100  or a roof assembly  400 . The first horizontal edge  222  is constructed generally flat extending inwardly to a depending semi-circular conduit  224 , the semi-circular conduit  224  extending from the second horizontal end  212  toward the mid-portion of the edge  222 . The conduit  224  is arranged to cooperate with a structural wall panel member  302  having a complimentary semi-circular conduit in a perpendicular relationship. To facilitate mechanical connection with structural second wall panel members  302  in a co-planar relationship the panels are provided a second horizontal edge  214  constructed with an attachment means illustrated as a semi-circular conduit  216  extending from about the first longitudinal end  208  past the middle portion of the edge  214 . Centrally located within the semi-circular conduit  216  is a generally circular aperture  218  for accepting a dowel  220 . 
   Continuing with regard to  FIGS. 6-8 , a third structural side wall panel is shown. The third structural wall panel  203  constitutes one of a plurality of like-configured panels in the system used to construct the left and right side wall assemblies  200 . The third structural wall panels  203  are each configured having a first longitudinal end  209  including an integrally formed attachment means illustrated as a plurality of sockets  210 . A second longitudinal end  213  also including an integrally formed attachment means also illustrated as a plurality of sockets  210 . The sockets  210  are generally constructed and arranged to cooperate with either a floor assembly  100  or a roof assembly  400 . To facilitate mechanical connection with structural second wall panel members  302  in a co-planar relationship the panels are provided a first horizontal edge  215  constructed with an attachment means illustrated as a semi-circular conduit  217  extending from about the second longitudinal end  213  toward the middle portion of the edge  215 . Centrally located within the semi-circular conduit  217  is a generally circular aperture  218  for accepting a dowel  220 . The second horizontal edge  223  is constructed generally flat extending inwardly to a depending semi-circular conduit  224 , the semi-circular conduit  224  extending from the first horizontal end  209  toward the mid-portion of the edge  223 . The conduit  224  is arranged to cooperate with a structural wall panel member  302  having a complimentary semi-circular conduit in a perpendicular relationship. 
   Continuing with regard to  FIGS. 6-8 , the outer surface  228  ( FIG. 2 ) of the panels  202  and  203  are constructed generally smooth having a plurality of inwardly bowed surfaces  230  for added strength and aesthetic appearance. The inside of the panels  232  are constructed with a plurality of ribs  204  extending from the first edge  222 ,  223  across the panel  202 ,  203  to the second edge  214 ,  215  respectively. Each of the ribs  204  being provided with a plurality of gussets  206  to further strengthen the panels. The ribs  204  and gussets  206  increase the structural integrity of the enclosure  10  by preventing the panels  202 ,  203  from bowing or bending inwardly or outwardly, and thus, adversely affecting the appearance or operation of the enclosure  10 . The reinforced ribs also provide support for optional shelves (not shown). The construction of the ribs  204  allow shelving to extend across the span of the shed thereby dividing the load between two walls and eliminating the cantilever effect of attaching a shelf to a single wall surface. 
   Assembly of the left side wall  200  of the shed is completed by attaching the first wall panel  202 , second wall panel  302 , and third wall panel  203  to the interconnected floor-panels  102  by sliding the first longitudinal ends  208 ,  308 ,  209  respectively over a plurality of the locking posts  116 . Thereafter, each corresponding panel being slid into place in an adjacent relationship to the prior panel. The sockets  210  in each end of the panels  202 ,  302 ,  203  correspond in shape and size to that of the posts  116 . Spring tabs  126  ( FIG. 3 ) integrally formed into the posts  116  align with apertures  234  in the sockets  210  to engage the side wall panels  202 ,  302  and  203 . The result is a positive mechanical connection between the wall-panels  200  and the floor assembly  100 . The first wall panel  202  being assembled to the floor assembly  100  with the first longitudinal end  208  downward. The second panel  302  is thereafter assembled adjacent to the first with its first longitudinal end  308  downward ( FIG. 7 ). The third wall panel  203  is assembled adjacent to the second panel with its first longitudinal end  209  downward. Secured to the first longitudinal end  209  of the conduit  224  of the third assembled wall panel  203  is a hinge pin connector  238  constructed and arranged to cooperate with a floor assembly hinge pin  128  ( FIG. 3 ) and the rear wall assembly  300 . 
   It will be appreciated that the purpose of the semi-circular conduits  216 ,  224  are to align two panels in a co-planar or perpendicular relationship and to facilitate their mechanical connection via the dowel  220 . The semi-circular conduits  216 ,  224  are brought into an overlapping relationship wherein a dowel pin  220  enters the corresponding aperture  218  in each conduit ( FIG. 6 ). The result is a mechanically secure connection between the two panels (FIG.  8 ). The overlapping edges between the panels as described above provides a secure connection and offers several advantages. First, the design allows the panels to be connected without the need for I-beam connectors. Second, the design creates a positive lock that prevents separation of the panels. Third, the design maintains alignment of the panels in the same plane and prevents bowing or bending of either panel relative to one another. The resultant wall created by the combination of the interlocking wall-panels benefits from high structural integrity and reliable operation. 
   Referring to  FIGS. 9-10 , assembly of the structural rear wall is shown. The second wall panel  302  constitutes one of a plurality of like-configured panels in the system used to construct the rear wall assembly  300 . The second wall panels  302  are each configured having a first longitudinal end  308  including an integrally formed attachment means illustrated as a plurality of sockets  210 . A second longitudinal end  312  includes an integrally formed attachment means also illustrated as a plurality of sockets  210 . The sockets are generally constructed and arranged to cooperate with either a floor assembly  100  or a roof assembly  400 . To facilitate mechanical connection with first, second, or third wall panel members  202 ,  302 ,  203  respectively in a co-planar or perpendicular relationship, the panels are provided a first horizontal edge  314  constructed with a semi-circular conduit  316  extending from about the second longitudinal end  312  toward the middle portion of the edge. Centrally located within the semi-circular conduit  316  is a generally circular aperture  318  for accepting a dowel  220 . The second horizontal edge  322  is constructed generally the same as the first horizontal edge  314  with the exception that the semi-circular conduit  324  extends from the first horizontal end  308  past the mid-portion of the panel. The conduits  316 ,  324  are arranged to cooperate with a other panel members having a complimentary semi-circular conduit in a co-planar or a perpendicular relationship. Hinge cap  336  is constructed and arranged to cooperate with the first longitudinal end of the semi-circular conduit and a floor assembly hinge pin  128 . 
   Continuing with regard to  FIGS. 9-10 , the outer surface  328  ( FIG. 2 ) of the panels  302  are constructed generally smooth having a plurality of inwardly bowed surfaces  330  ( FIG. 2 ) for added strength and aesthetic appearance. The inside of the panel  332  is constructed with a plurality of ribs  304  extending from the first edge  314  across the panel to the second edge  322 . Each of the ribs  304  being provided with a plurality of gussets  306  to further strengthen the panel  302 . The ribs  304  and gussets  306  increase the structural integrity of the enclosure  10  by preventing the panels  302  from bowing or bending, inwardly or outwardly and thus, adversely affecting the appearance or operation of the enclosure  10 . 
   The panels  302  are attached to the interconnected floor panels  102  and the installed left side panels  202 ,  203  by sliding the first longitudinal end  308  of a second wall panel downward over a dowel  220  aligning the semi-circular conduits. The second assembled rear panel  302  being adjacent in relation to the first and slid downward engaging the inserted post  338  and the hinge pin in the floor assembly via a hinge cap  336  inserted into the semi-circular conduit and engaging the first assembled rear panel via the dowel  220 . Spring tabs  126  integrally formed into the inserted post  338  and hinge caps  336  align with apertures  234  in the second wall panels  302  for engagement. The result is a positive mechanical connection between the left wall assembly  200 , rear wall assembly  300  and the floor assembly  100 . 
   Referring to  FIGS. 11-12  the right side wall panels are attached to the interconnected floor-panels  102  and the assembled rear wall assembly  300  by sliding the first longitudinal end  208  of a first wall panel  202  over a plurality of the locking posts  116 . The second wall panel  302  is thereafter assembled adjacent to the first with its first longitudinal end  308  downward ( FIG. 7 ). The third wall panel  203  is assembled adjacent to the second panel with its first longitudinal end  209  downward. Secured to the first longitudinal end  209  of the conduit  224  of the third assembled wall panel  203  is a hinge pin connector  238  constructed and arranged to cooperate with a floor assembly hinge pin  128  ( FIG. 12 ) to allow rotational movement of the door assembly  500 . The sockets  210  in the ends of the panels  202 ,  203  and  302  correspond in shape and size to that of the posts  116 , and spring tabs  126  ( FIG. 3 ) integrally formed into the posts  116  align with apertures  234  in the sockets  210  to engage the side wall panel  202 ,  203  or  302 . The result is a positive mechanical connection between the wall panels  200  and the floor assembly  100 . 
   Referring to  FIGS. 13-15  the enclosure  10  includes a fixed roof panel  402  and a sliding roof panel  403 . The fixed roof panel includes a top surface  404 , bottom surface  406 , and four closed edges  408 ,  410 ,  412  and  414 . The bottom surface of the fixed roof panel is constructed generally smooth and may include a securely attached steel reinforcement tube  480  to add additional structural integrity to the roof assembly. ( FIG. 15 ) Adjacent to the two side closed edges  410 ,  414  and the rear closed edge  412  are a plurality of locking posts  416  extending outwardly from the bottom surface  406 . The locking posts  416  are constructed and arranged to cooperate with sockets  210  located at the second longitudinal end of the structural wall panels  202 ,  203  and  302 . The fixed roof panel  402  is placed over the assembled left, right, and rear walls and lowered into place. The locking posts  416  are lined up with the corresponding sockets  210  in the wall panels  202 ,  203 , and  302 . The fixed roof panel  402  is secured in place by pulling downward on the panel until the spring tabs  446  integrally formed into the locking posts  416  engage corresponding apertures  234  formed in the sockets  210 . The result is a positive mechanical connection between the wall panels  202  and  302  and the fixed roof panel  402 . 
   The fixed roof panel  402  includes an upper track groove  418  adjacent to each of the two side closed edges  410 ,  414  and extending along the top surface  404 . The upper track groove  418  extends inwardly into the fixed roof panel and is constructed generally having a V-shaped cross section, and is arranged to cooperate with the tracks  430  which extend outwardly from the bottom surface  422  of the telescoping roof panel  403 . The fixed roof panel also includes a outer track groove  488  adjacent to each of the two side closed edges  410 ,  414  extending along the bottom surface  406 . The outer track groove  488  extends inwardly into the fixed roof panel  402  and is constructed having a generally U-shaped cross section. 
   Continuing with regard to  FIGS. 13-15 , the roof assembly  400  also includes a right wall cap  450  and a left wall cap  470 . The right wall cap includes a top surface  452 , a bottom surface  454 , an inner closed edge  456 , and an outer closed edge  458 . The lower surface  454  is constructed with a plurality of outwardly extending locking posts  416  which are arranged to cooperate with sockets  210  located at each longitudinal end of the structural wall panels  202 ,  302 , and  203 . Along the lower surface  454  and adjacent to the inner closed edge  456  is an inner track groove  482  having a generally U-shaped cross section. The top surface  452  is constructed generally smooth having an upper track groove  460  with a generally V-shaped cross section extending along a longitudinal centerline. 
   The right wall cap  450  is placed over the assembled right wall and lowered into place. The locking posts  416  are lined up with the corresponding sockets  210  in the wall panels  202 ,  203 , and  302 . The right wall cap  450  is secured in place by pulling downward on the cap until the spring tabs  446  integrally formed into the locking posts  416  engage corresponding apertures  234  formed in the sockets  210 . The result is a positive mechanical connection between the wall panels  202 ,  203  and  302  and the wall cap  450 . 
   The left wall cap  470  includes a top surface  472 , a bottom surface  474 , an inner closed edge  476 , and an outer closed edge  478 . The bottom surface  474  is constructed and arranged with a plurality of outwardly extending locking posts  416  which cooperate with sockets  210  located at the second longitudinal end of the structural wall panels  202 ,  203  and  302 . Along the bottom surface  474  and adjacent to the inner closed edge  476  is a generally U-shaped inner track groove  482 . The top surface  472  is constructed generally smooth having an upper track groove  460  with a generally V-shaped cross section extending along a longitudinal centerline. 
   The left wall cap  470  is placed over the assembled left wall and lowered into place. The locking posts  416  are lined up with the corresponding sockets  210  in the wall panels  202  and  302 . The left wall cap  470  is secured in place by pulling downward on the cap until the spring tabs  446  integrally formed into the locking posts  416  engage corresponding apertures  234  formed in the sockets  210 . The result is a positive mechanical connection between the wall panels  202  and  302  and the left wall cap  470 . 
   Continuing with regard to  FIGS. 13-15 , the telescoping roof panel  403  includes a top surface  420 , bottom surface  422 , and four closed edges  424 ,  426 ,  428  and  430 . The top surface is constructed generally smooth and includes a pair of integrally formed sockets  484  which are constructed and arranged to slidingly cooperate with outer track guides  490 . The outer track guides  490  are generally C-shaped and constructed and arranged to be secured to the telescoping roof panel  403  and to slidingly cooperate with the outer track groove  488  in the fixed roof panel  402 . The upper surface also includes an integrally formed handle  492 . The bottom surface includes a plurality of strengthening ribs  482 . The strengthening ribs add structural rigidity and load capacity to the roof assembly  400 . The bottom surface  422  also includes a pair of integrally formed sockets  484  which are constructed and arranged to cooperate with inner track guides  486 . The inner track guides  486  are constructed and arranged to slidingly cooperate with their respective inner track grooves  482  in wall caps  450 ,  470 . Adjacent to each of the two side closed edges  424 ,  428  and depending downwardly from the bottom surface  422  are tracks  430 . The tracks  430  have a generally V-shaped cross section to cooperate with the upper track grooves  418  of the fixed roof panel  402  and the wall caps  450  and  470 . 
   The telescoping roof panel  403  is placed over the assembled fixed roof panel  402 , and the assembled first and second wall caps  450 ,  470  and lowered into place aligning the tracks  430  with their respective upper track grooves  418 . The inner track guides  486  are secured in place by pushing upward on each of the inner track guides until the spring tabs  446  integrally formed into the inner track guides  486  engage corresponding apertures  234  formed in the sockets  484 . The result is a positive mechanical connection between the inner track guides  486  and the telescoping roof panel  403 . The outer track guides are secured in place by pushing downward on the outer track guide until the spring tabs  446  engage corresponding apertures  234  formed in the sockets  484 . The result is a positive mechanical connection between the inner track guides  486  and the telescoping roof panel  403 . The cooperative sliding engagement between the upper, inner, and outer track guides allow the telescoping roof panel to be easily and reliably retracted and extended to allow easy access to the enclosure contents. The construction of the inner and outer track guides provide anti-lift protection and security to the contents of the enclosure. 
   Referring to  FIGS. 16-19 , the enclosure includes a door assembly including a left and a right door panel, a hinge means, a left and a right door header, and a latch assembly. The left door panel  502  and right door panel  503  constitute the panels in the system used to construct the door assembly. The left door panel  502  is configured having a first longitudinal end  508  including at least one integrally formed socket  210 . The socket  210  is generally constructed and arranged to cooperate with a hinge cap  336  having a C-shaped annular portion. The second longitudinal end  512  includes a plurality of integrally formed sockets  510 . The sockets are generally constructed and arranged to cooperate with the left header  550 . The left header  550  is constructed with a plurality of outwardly extending locking posts  416  which are constructed and arranged to cooperate with sockets  210  located at the second longitudinal end  512  of the left door panel  502 . To facilitate mechanical connection with other side wall panel members  202  in a pivoting relationship the left side panel is provided with a first horizontal edge  514  constructed with a semi-circular conduit  516  extending from about the first longitudinal end  508  past the middle portion of the edge. The hinge cap  336 , and the semi-circular conduit  516  each containing at least one hinge means illustrated as a C-shaped annular portion  518  having an open side  520  constructed and arranged to accept a hinge pin  128 , or a dowel pin  220  and to cooperate with a hinge clip  540  to close the annular cavity  518  and allow pivoting movement of the left door panel  502 . The second horizontal edge  522  is constructed generally flat. 
   The right door panel  503  is configured having a first longitudinal end  509  which includes an integrally formed C-shaped annular hinge portion  524 . The second longitudinal end  513  includes a plurality of integrally formed sockets  510 . The sockets are generally constructed and arranged to cooperate with the right header  552 . The right header  552  is constructed with a plurality of outwardly extending locking posts  416  which are constructed and arranged to cooperate with sockets  210  located at the second longitudinal end  513  of the left door panel  503 . To facilitate mechanical connection with other side wall panel members  202  in a pivoting relationship the right door panel is provided with a first horizontal edge  515  constructed with a semi-circular conduit  517  extending from about the second longitudinal end  513  toward the middle portion of the edge. The integrally formed hinge portion  524 , and the semi-circular conduit  517  each containing at least one hinge means illustrated as a C-shaped annular portion  518  having an open side  520  constructed and arranged to accept a hinge pin  128 , or a dowel pin  220  and to cooperate with a hinge clip  540  to close the annular cavity  518  and allow pivoting movement of the right door panel  503 . The second horizontal edge  523  is constructed generally flat with the exception of a optional ledge  532  extending the full length of the panel. The optional ledge  532  may be attached by any suitable fastening means well known in the art or may be integrally formed with the panel. The right door panel  503  is also provided with a lower sliding latch mechanism  534 . 
   Continuing with regard to  FIGS. 16-19 , the outer surface  528  of the panels  502 ,  503  are constructed generally smooth having a plurality of inwardly bowed surfaces  530  for added strength and aesthetic appearance. The inside surface of the left and right door panels  502  and  503  are constructed with a plurality of ribs  504  extending from the first edge  514  across the panel  502  to the second edge  522 . Each of the ribs  504  may be provided with a plurality of gussets (not shown) to further strengthen the panel  502 . The ribs  504  increase the structural integrity of the enclosure  10  by preventing the panels  502  from bowing or bending, inwardly or outwardly and thus, adversely affecting the appearance or operation of the enclosure  10 . 
   Referring to  FIG. 17-19 , the door panels  502 ,  503  are attached to the interconnected floor panels  100 , and the left and right side wall assemblies  200  by aligning the hinge pins and sliding the panel horizontally into place over the respective pins and engaging the hinge clips  540 . The body of the hinge clip  540  is generally concave and rectangular and includes spring tabs  542  located at each end adapted to fit within the respective hinge caps to secure the door panels to the hinge pins and facilitate independent rotational movement of each door. It should be appreciated that this construction allows the doors to be installed or removed without disassembling or partially disassembling other components from the enclosure  10 . The construction also provides economic advantage allowing inexpensive hinge components to be easily removed and replaced in the event they become damaged. The right door panel is also provided with removable and replaceable door latching mechanism  534 . 
   Referring to  FIGS. 20-21 , installation of the lower door latch is illustrated. The door latch is constructed and arranged to allow simple push-in installation. The latch housings  552  are merely pushed into apertures  546  located adjacent to edge  523  in the door panel  503  until the spring clips  548  engage the panel  503 . Thereafter the one end of the door latch pin  554  is inserted through the housing  552  and downwardly until spring clip  550  is snapped into place. In this manner the door latches can be installed and removed as need without the need for tools or screw type fasteners. By sliding the latch pin  554  to extend it outwardly to engage the floor assembly  100  the contents contained within the enclosure  10  are secured. 
   All patents and publications mentioned in this specification are indicative of the levels of those skilled in the art to which the invention pertains. All patents and publications are herein incorporated by reference to the same extent as if each individual publication was specifically and individually indicated to be incorporated by reference. 
   It is to be understood that while a certain form of the invention is illustrated, it is not to be limited to the specific form or arrangement herein described and shown. It will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is shown and described in the specification. 
   One skilled in the art will readily appreciate that the present invention is well adapted to carry out the objectives and obtain the ends and advantages mentioned, as well as those inherent therein. The embodiments, methods, procedures and techniques described herein are presently representative of the preferred embodiments, are intended to be exemplary and are not intended as limitations on the scope. Changes therein and other uses will occur to those skilled in the art which are encompassed within the spirit of the invention and are defined by the scope of the appended claims. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in the art are intended to be within the scope of the following claims.

Summary:
The present invention provides a system of injection molded panels having integrated connectors which combine to form a low profile enclosure having a telescoping roof. The panels are formed of injection molded plastic to interlock with one another without the need for separate I-beam connectors. The ends of the wall panels have cavities to accept both roof and floor outwardly projecting locking posts for interlocking cooperative engagement which serve to rigidly connect the components together. The construction of the wall, roof, floor and door components minimizes component shapes and simplifies enclosure construction.