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FIELD OF THE INVENTION 
   This invention relates generally to a wall cabinet assembly constructed of injection molded plastic structural panels. More specifically, the present invention relates to a wall cabinet with a flipper door which is capable of being packaged and shipped in a knocked-down state and constructed into a secure wall cabinet at a desired site. 
   BACKGROUND INFORMATION 
   Throughout the home, a need exists to store a large variety of different items. This is particularly true of garage and utility areas where a vast array of products have been developed to increase the comfort level of living. The accumulation of these various objects and products gives rise to a need for adequate storage of those items when not in use. 
   Various cabinets for storing household items such as gardening tools, automotive supplies, barbeque accessories and the like are well known. One of the more popular types of cabinets for storing household items is a wall cabinet with a flipper door. Cabinets with flipper doors are well-known in the prior art. Flipper doors are opened by pulling the bottom of the door upward in a 90 degree arc such that the door is parallel to the top wall of the cabinet. The flipper door is then slid into the opening adjacent the top wall such that the opening is completely exposed. The movement of the flipper door is usually accomplished through use of a rack and pinion assembly. Usually the rack is located on the inside of the sidewalls of the cabinet, while the pinion is connected to an axle or rod which is attached to the door by brackets or hinges. Illustrative of such cabinets with flipper door systems are U.S. Pat. No. 644,434 to Macey; U.S. Pat. No. 657,017 to Tobey; U.S. Pat. No. 726,411 to Knight; U.S. Pat. No. 726,957 to Macey; U.S. Pat. No. 761,312 to Luellen; U.S. Pat. No. 1,288,665 to Page; U.S. Pat. No. 3,339,995 to Bencene; U.S. Pat. No. 3,748,005 to Chovanec et al; U.S. Pat. No. 3,794,401 to Dean et al; U.S. Pat. No. 4,265,502 to Blodee et al; U.S. Pat. No. 4,375,907 to Vander Kooi et al; U.S. Pat. No. 4,600,254 to Whalen; and U.S. Pat. No. 4,641,896 to Iimura et al. 
   Cabinets including drop doors and counterbalanced doors are also well known in the art, and are often preferred over other cabinets because the doors are less likely to produce the guillotine effect which may be caused by heavier flipper doors. 
   U.S. Pat. No. 2,258,948 to Garrison describes a bookcase unit with a drop door which uses a rack and pinion system similar to that used with a flipper door. However, instead of the door swinging outward and being stored adjacent to the top wall, the rack and pinion system is used to drop the door vertically down past the bottom of the unit. The pinion is attached to a rod which extends through loops in the hinges located at the top of the door. A runway located on the front inner sides of the bookcase contains a deep portion and a shallow portion. The shallow portion contains the rack which coacts with the pinion and allows the door to drop smoothly. The deep portion is engaged by the end of the rod which extends through the pinion. A spring is also provided around the rod which assists to counteract the effects of gravity and to achieve a more gradual dropping of the door. This door style lacks the space saving feature of the flipper door and tends to hinder access to lower cabinets or shelves. 
   U.S. Pat. No. 6,557,958 to Motta et al. discloses a storage bin with a counterbalanced door. The assembly includes panels forming a bin or cabinet, and a flipper door operably attached to the bin by a pair of opposing modules. Each module includes a body forming a groove in the form of a curvilinear track along its upper edge, and the door includes a follower operably engaging the track. Each module further includes a spring biased lever pivoted to the body of the module at a mid-lever point. A first leg of the lever is pivoted to the door at a door pivot point, and an oppositely extending second leg is connected to a spring biased force generating device. The arrangement is constructed to counterbalance the door in most intermediate positions. 
   Cabinets including an over-the-top door are also well known in the art and are often preferred over other cabinets because the doors do not take up space within the cabinet when opened. Such cabinets and doors often use a sliding hinge arrangement, where a pair of hinges are attached to the top and front of the cabinet and a track is attached to a side of the door for both slidably and pivotally engaging the hinge. The door opens by sliding the door upwardly and/or outwardly until the door can be slid onto the top of the cabinet for storage in an open position. 
   A problem is that these pivot/slide hinged doors can close with guillotine-like motion if the doors are prematurely released when partially open. This results in the doors moving vertically downwardly by gravity with a potentially unsafe speed and force unless proper care is used. Some cabinet manufacturers have conceived of alternatives to reduce the potential or likelihood of such accidental downward movement of the doors. However, the known alternatives are costly, include an unacceptable number of components, are mechanically too complex, and/or are difficult to assemble. 
   U.S. Pat. No. 4,615,570 to Goodman describes a cabinet with a flipper door which is stored horizontally above the top wall of the cabinet when in the open position. The flipper door is operated by a rack and pinion assembly. The rack is located on the upper inside wall of the cabinet and includes a lower guide channel. The pinion gears are rotatably coupled to each other by a transverse axle. The terminal ends of the axle extend through the pinion gears and slidably engage the lower guide channel. The flipper door of the cabinet is larger than the cabinet opening in order to cover the edges of the side walls when the door is closed. The rack is also provided with an upper guide channel. A link is attached between the transverse axle of the rack and pinion assembly and the door hinges. The stud shaft which secures the link to the hinge extends past the link to slidably engage the upper guide channel and to create a pivot axis which is shifted forward a sufficient amount to accommodate the extra width of the flipper door. The configuration of the door in this reference requires extra space above the cabinet for the door which also prevents stacking of the cabinets. U.S. Pat. No. 6,007,171, to Varellas-Olree discloses a cabinet assembly with an over the top door. The assembly includes a cabinet, a follower, and a mating guide. The cabinet is configured with a front opening. The door is configured to close the front opening. The sliding hinge structures operably support the door on the cabinet for pivotal and sliding movement between a closed position covering the front opening, and an open position uncovering the front opening and storing the door above the cabinet. The follower and the mating guide are separate from the hinge structures and operably attach an upper edge of the door to a front edge of the cabinet. The follower and guide constrain the door to a pivotal movement as the door is initially opened to prevent a sliding guillotine-like movement when the door opened. 
   Such prior art systems fail to meet all of the needs of manufacturers to provide a product that can be easily manufactured, packaged and shipped, or the needs of consumers requiring structural integrity combined with modularity and aesthetic appearance. Moreover, because these devices do not break down they are difficult to ship from the manufacturer to the consumer. 
   Paramount among such needs is a panel system which creates cabinet walls which resist panel separation, buckling and racking. Structure is a further consideration; the cabinet formed by the panels must tie into the flipper door and back panel in such a way as to unify the entire enclosure. Also, from a versatility standpoint, a flipper door should be present which can be easily opened and closed after assembly of the side, top, bottom and back panels, and which provides security and dependable pivoting access to the contents of the wall cabinet without the guillotine-like motion associated with the prior art. 
   There are also commercial considerations that must be satisfied by any viable wall cabinet system or kit; considerations which are not entirely satisfied by state of the art products. The wall cabinet must be formed of relatively few component parts that are inexpensive to manufacture by conventional techniques. The wall cabinet must also be capable of being packaged and shipped in a knocked-down state. 
   In addition, there are ergonomic needs that a wall cabinet 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 include heavy component parts. Moreover, the system must assemble together in such a way so as not to detract from the internal storage volume of the resulting wall cabinet or otherwise negatively affect the utility of the wall cabinet. 
   BRIEF DESCRIPTION OF THE INVENTION 
   The present invention provides an assembly, or kit, of injection molded panels having integrated connectors which combine to form a wall cabinet with a flipper door. The panels are formed to interlock with one another without the need for separate fasteners or connectors. The system incorporates a minimum number of components to construct a wall cabinet by integrally forming the connectors into the injection molded panels. This minimizes the need for separate connectors or fasteners to assemble the wall cabinet. The integrated connection of the side wall, cover and bottom panel components also simplifies the wall cabinet construction. Injection molding allows the panels to be formed with integral cross-bracing, ribs and gussets for increased rigidity. When supplied as a kit, assembly of the wall cabinet requires minimal hardware and a minimum number of hand tools. 
   The left and right side wall panels are constructed with outwardly extending contoured locking posts for interlocking cooperative engagement with sockets in the ends of the like-constructed top and bottom panels. The engagement between the locking posts and the sockets serve to rigidly connect the components together. The assembly includes a rear panel which interlocks into grooves integrally formed into the left, right, top and bottom panels to prevent the panel from bowing inwardly or outwardly to provide security and aesthetic appearance. The rear panel includes a plurality of keyhole slots to allow the assembled cabinet to be easily and securely attached to a wall. The interior of the wall cabinet assembly includes two integrally molded tracks which extend front to rear along the upper portion of each side panel. Each track is constructed to accept D-shaped pin members which define an axis of rotation and which extend outwardly from each side of the upper portion of the flipper door. The cooperation between the tracks and the D-shaped pins only allow the flipper door to be rotated while it is in its farthest forward position, and only allow the flipper door to be slid into the cabinet while the door has been rotated about the axis to an essentially horizontal position such that the door is generally parallel to the top wall of the cabinet. This construction allows the flipper door to be secured across the opening of the cabinet while in the closed position, and allows the flipper door to be slid into the cabinet to an essentially juxtaposed position beneath the top panel such that the opening is completely exposed. 
   Accordingly, it is an objective of the present invention to provide a wall cabinet system having a flipper door which operates via a novel hinge and slider track assembly. 
   It is a further objective of the present invention to provide a guide device, by which a flipper door can be smoothly guided inwardly into a cabinet body, and the flipper door can be received sufficiently far into the cabinet body to provide access to the interior of the cabinet. 
   Yet a further objective of the present invention is to provide a wall cabinet system constructed from panels having integrated connectors which accommodate injection molding plastic formation of the panel components for increased structural integrity. 
   Another objective of the present invention is to provide a wall cabinet storage system in which the side walls, top panel, and bottom panel are interlocked without the need for separate fasteners. 
   Yet another objective of the present invention is to provide a kit for a wall cabinet that is capable of being packaged and shipped in a knocked-down state and constructed into a secure cabinet. 
   Other objectives and advantages of the present 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 the instant invention; 
       FIG. 2  is an exploded view of the instant invention illustrated with the flipper door omitted for clarity; 
       FIG. 3  is a perspective view of the back of the instant invention; 
       FIG. 4  is a perspective view of the instant invention, illustrated with the flipper door in the open position; 
       FIG. 5  is a perspective view of the flipper door of the instant invention; 
       FIG. 6  is a perspective view of the inner surface of the left side panel of 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. 1–5  which are now referenced illustrate perspective and exploded views of the wall cabinet assembly, generally referenced as  10 , according to a preferred embodiment of the present invention. The wall cabinet generally includes like-constructed top and bottom panels  100 , left side panel  200 , right side panel  300 , rear panel  400  ( FIG. 2 ), and flipper door panel  500 . In the preferred embodiment, the panels comprising the assembly 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 wall cabinet assembly  10  are formed as unitary panels with integral connectors and cross bracing. Strengthening ribs  102 ,  202  ( FIG. 2 ) are integrally formed within the inner and lower surfaces respectively of the side, top, and bottom panels 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 top and bottom panels  100  have an upper surface  104 , lower surface (not shown), front edge  106 , rear edge  108 , and like-constructed left edge  112  and right edge  114 . Adjacent to each of the left and right edges  112 ,  114  is a means of attaching the top and bottom panels to the left side panel  200  and right side panel  300 , illustrated as a plurality of formed sockets  116  extending inwardly from each end. The formed sockets  116  are constructed and arranged to cooperate with locking posts  210  extending outwardly along the inner surfaces  204  of the left and right side panels  200 ,  300 . The locking posts  210  and sockets  116  are constructed and arranged so that the locking posts  210  enter and mateably engage the sockets  116  securing the panels together in an inter-fitting perpendicular engagement. The upper and lower surfaces  104  of the top and bottom panels  100  are also constructed with a groove  118  extending from about the left end  112  to about the right end  114  of the panels. The groove  118  is constructed and arranged to cooperate with the rear panel  400 . The cooperating engagement between the rear panel  400  and the grooves  118  increases the structural integrity of the wall cabinet assembly  10  by preventing the rear panel  400  from bowing or bending inwardly or outwardly, and thus, adversely affecting the appearance or operation of the wall cabinet assembly  10 . 
   The inner surfaces  204  of the left and right side wall panels  200  and  300  are each configured having an upper portion  208  and a lower portion  212 . Both portions  208 ,  212  include an integrally formed attachment means illustrated herein as outwardly extending locking posts  210 . The locking posts  210  are generally constructed and arranged to cooperate with the sockets  116  provided in either end of the top and bottom panels  100 . 
   The outer surface of the panels  200 ,  300 ,  400 ,  500  and the upper surface of the panels  100  are constructed generally smooth and may be bowed inwardly for added strength and aesthetic appearance. The inner surfaces of the panels  200  and  300  and the lower surfaces of the panels  100  are constructed with a plurality of strengthening ribs  202  and  102 , respectively, extending across the panels, and may additionally be provided with a plurality of gussets (not shown) to further strengthen the panels. The ribs and gussets increase the structural integrity of the wall cabinet assembly  10  by preventing the panels  100 ,  200 , and  300  from bowing or bending inwardly or outwardly, and thus, adversely affecting the appearance or operation of the wall cabinet  10 . The integrally formed ribs  102 ,  202  and optional gussets are facilitated by injection molding. Injection molding offers significant strength and stability advantages over wood or metal construction 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 wooden or sheet metal cabinets. 
   The left and right side panels  200 ,  300  are attached to the top and bottom panels  100  by inserting the locking posts  210  into formed sockets  116  until the spring tabs  214  integrally formed into the locking posts  210  engage the apertures  120  in the sockets  116  of the top and bottom panels  100 . It will be appreciated that the purpose of the locking posts  210  are to align two panels in a perpendicular relationship and to facilitate their mechanical connection. The perpendicular panels are brought into an overlapping relationship wherein the locking posts  210  enter the corresponding socket  116  in the top and bottom panels  100 . The result is a coupling engagement between the two panels. The overlapping edges between the panels as described above provide a secure connection and offer several advantages. First, the design allows the panels to be connected without the need for separate fasteners. 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 cabinet created by the combination of the interlocking panels benefits from high structural integrity and reliable operation. 
   Referring to  FIGS. 2 and 3 , the rear panel  400  is attached to the top and bottom panels  100  by sliding the upper and lower edges  402 ,  404  into the corresponding grooves  118  in the upper and lower surfaces of the top and bottom panels  100 . The grooves  118  in the top and bottom panels  100  correspond in shape and size to that of the upper and lower rear panel edges to engage the rear panel  400 . The result is a positive mechanical connection between the rear panel  400  and the top and bottom panels  100 . 
   Referring to  FIGS. 3 and 6 , the wall cabinet mounting means is illustrated. The wall cabinet mounting means is illustrated herein in a non-limiting embodiment as a plurality of integrally formed keyhole slots  216 . The keyhole slots  216  depend inwardly from the rear portion of the left side panel  200  and right side panel  300 . The keyhole slots are adapted to allow the wall cabinet to be easily mounted and dismounted from a wall surface. In operation, a minimum of two and preferably four fasteners are locationally arranged and attached to a wall surface. The wall cabinet keyhole slots  216  are thereafter slid over the heads of the fasteners (not shown) and the wall cabinet is slid downward a small amount. The cooperation between the keyhole slots and the fasteners holds the wall cabinet assembly  10  securely to the wall surface. 
   Referring to  FIGS. 4 and 5 , the flipper door  500  is illustrated. The flipper door  500  is generally constructed and arranged for enclosing the front of the wall cabinet  10 . The flipper door  500  includes an outer surface  502 , an inner surface  504 , a top edge  506 , a bottom edge  508 , a left edge  510 , and a right edge  512 . The left edge  510  and the right edge  512  each include a pivot means, illustrated herein as a D-shaped pin member  514  which defines an axis of rotation and extend outwardly from the upper portion thereof. The D-shaped pin members are generally constructed and arranged to cooperate with the left and right side panel tracks  218  ( FIG. 6 ) to allow the lower edge  508  of the flipper door  500  to rotate about the axis to an essentially horizontal position when in a forward most position and thereafter slide inwardly in a generally parallel and adjacent manner to the lower surface of the top panel  100  along the track  218  and to an essentially juxtaposed position beneath the top panel to provide ingress into the wall cabinet. The flipper door  500  is also provided with a latch means for releasably securing the flipper door in a lowered position across the wall cabinet opening. The latch means is illustrated herein as a spring-lock  516  integrally formed into the lower portion of the left and right edges  510 ,  512  of the flipper door  500 . The spring-locks  516  are generally constructed and arranged to cooperate with a catch plate  220  ( FIG. 6 ) depending inwardly from the front portion of the inner surfaces of the left and right side panels  200 ,  300 . 
   Referring to  FIG. 6 , the inner surface of the left side panel  200  is shown, illustrating the like-constructed tracks  218  integrally formed into the inner surface of the left and the right side panels  200 ,  300 . The tracks  218  are constructed as inwardly depending tracks having a generally circular front portion  222  and a rearwardly extending upper track portion  224  and lower track portion  226  terminating in a rear stop portion  228 . The lower track portion  226  extending rearwardly and about tangentially from the lower quadrant of the circular portion  222 , and the upper track portion  224  extending rearwardly and generally parallel to the lower track portion. The circular front portion  222  is constructed and arranged to allow rotation of the cooperating D-shaped pin  514 , and the rearwardly extending track portions  224 ,  226  operably engage the cooperating D-shaped pin to allow linear translation after upward rotation of the flipper door  500 . The flat side of the D-shaped pin  518  cooperates with the upper track portion  224  and the radiused side of said D-shaped pin  520  cooperates with the lower track portion  226  to prevent rotation of the flipper door  500  during its linear translation. 
   Thus, a wall cabinet assembly with a flipper door comprised of injection molded components having integrated connectors which may be provided as a kit and assembled on a desired site has been shown and described. 
   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:
A self-fastening wall cabinet including a plurality of panels having integrated connectors, and a flipper door. The plurality of panels are formed of injection molded plastic and interlock with one another to assemble the wall cabinet without the need for separate fasteners or connectors.