Abstract:
The present invention relates generally to electrical panels or enclosures. More particularly, the invention encompasses a removable endwall plate for electrical panels or enclosures. The present invention is also directed to a novel electrical panel or enclosure where an endwall is removably attached to a frame. The endwall can be removed and can be cut at desired locations to create holes or openings for electrical components. The removable endwall can also have one or more knockouts which can be removed from the endwall as needed. One could also have at least one knockout within the knockout.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    The instant patent application claims priority to and the benefit of pending U.S. Provisional Patent Application Ser. No. 61/167,594, filed on Apr. 8, 2009, titled “Removable Endwall Plate For Electrical Panels or Enclosures,” the entire disclosure of which provisional application is incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates generally to electrical panels or enclosures. More particularly, the invention encompasses a removable endwall plate for electrical panels or enclosures. The present invention is also directed to a novel electrical panel or enclosure where an endwall is removably attached to a frame. The endwall can be removed and can be cut at desired locations to create holes or openings for electrical components. The removable endwall can also have one or more knockouts which can be removed from the endwall as needed. One could also have at least one knockout within the knockout. 
       BACKGROUND INFORMATION 
       [0003]    Contractors/electricians/installers spend hours aligning conduit to pre-cut knockouts in an enclosure wall. They also spend excessive time measuring and transposing conduit profiles on a fixed blank endwall which is permanently attached to a panel or enclosure before cutting the required openings for a wire conduit or any other required opening or conduit. Most of the time these openings have to be made prior to hanging or mounting the panel or enclosure onto the wall. For this reason, panels or enclosures having a fixed endwall creates an awkward process of cutting the holes needed for the conduit, such as, a wire conduit. It also produces an awkward process for hanging or mounting of the enclosure to the wall once the openings have been cut. In this manner the installation of a panel or enclosure becomes very labor intensive and time consuming. Therefore, there is a need for improvement in electrical panels or enclosures, especially for accommodating electrical components, such as, electrical wires, electrical conduits, to name a few. 
         [0004]    U.S. Pat. No. 4,679,867 (Stanley W. Heldenbrand, et al.), the entire disclosure of which is incorporated herein by reference, discloses a cabinet for an electronic apparatus which includes a shelf of removable electronic circuit modules being interconnected by a back plane structure, the cabinet including side walls for supporting the shelf and a rear closure wall detachably fixed to rear edges of the side walls. Connector panels each diagonally straddle rear interior corners at junctions of the rear wall and the side walls to define vertical cable channels. An interconnect cavity behind the back plane structure is defined by a central portion of the rear wall between the connector panels and is limited by upper and lower closure panels at upper and lower ends of the connector panels. Edges of the upper and lower closure panels and the connector panels define a port for convenient physical access to the interconnect cavity when the rear wall is removed. Cable spans between the back plane structure and the connector panels are inherently direct and short, thereby minimizing potential EMI radiation such that feedthrough capacitance of connectors in the connector panel is likewise advantageously minimized. 
         [0005]    U.S. Pat. No. 6,751,913 (John R. Marrotte, et al.), the entire disclosure of which is incorporated herein by reference, discloses a wall structure includes at least two studs that are designed to support panels front and back, and end caps or raceway channel defining members on the leading and trailing edges of the panel wall structure. Each of the studs includes sets of oppositely arranged flanges that in turn cooperate with marginal edges of both the panels and the raceway defining members. Cross bracing is provided to allow wiring either within the enclosed space between the panels, or more preferably in the wireways defined in the raceway members so that the power and data communication conductors can be isolated from one another. The feature of the panel structure is that the panels themselves can support light fixtures or other lightweight electrical devices, and heavier electrical devices or units can be accommodated from the cross bracing or from shelves secured to the cross bracing and to the studs. Knockout openings in the studs and in the cross bracing provides for convenience in wiring and in mounting of electrical devices generally. 
         [0006]    U.S. Pat. No. 7,286,339 (William C. Baca), the entire disclosure of which is incorporated herein by reference, discloses an underground combination service entrance apparatus for temporary and permanent service comprising two enclosures. A utility enclosure contains a meter socket and the second enclosure contains a breaker panel. The breaker panel on the customer side and the meter on the utility side meet NEC requirements and the local utility company regulations. An optional section in the utility enclosure provides a raceway space for routing wiring. Knockout holes are provided on the utility enclosure for installation of a hub for running wires to and from the service apparatus. The enclosures can be semi-flushed mounted. The two enclosures are isolated from each other, fastened together, and mounted on a wall. A removable hood is provided to weatherproof the customer enclosure for temporary use. 
         [0007]    However, this invention improves on the deficiencies of the prior art and provides an inventive removable endwall plate for electrical panels or enclosures. 
       PURPOSES AND SUMMARY OF THE INVENTION 
       [0008]    The invention is a novel removable endwall plate for electrical panels or enclosures. 
         [0009]    Therefore, one purpose of this invention is to provide a removable endwall plate for electrical panels or enclosures. 
         [0010]    Another purpose of this invention is to provide at least one endwall for an electrical panel or enclosure, which can be removed in the field, and where at least one opening can be created in the endwall, and the endwall with at least one opening is then secured back onto the frame of the electrical panel or enclosure. 
         [0011]    Yet another purpose of this invention is to provide an endwall having at least one knockout, and where the knockout can be removed when desired. 
         [0012]    Therefore, in one aspect this invention comprises an electrical apparatus comprising: 
         [0000]    (a) an enclosure, said enclosure having at least one back wall, a first side wall, a second side wall;
 
(b) a bottom frame, wherein said bottom frame is secured to a bottom edge of said enclosure;
 
(c) a top frame, wherein said top frame is secured to a top edge of said enclosure; and
 
(d) at least one removable endwall secured to said enclosure.
 
         [0013]    In another aspect this invention comprises an electrical apparatus comprising: 
         [0000]    (a) an enclosure, said enclosure having at least one back wall, a first side wall, a second side wall;
 
(b) a bottom frame, wherein said bottom frame is secured to a bottom edge of said enclosure;
 
(c) a top frame, wherein said top frame is secured to a top edge of said enclosure;
 
(d) at least one removable endwall secured to said enclosure.
 
(e) at least one means for removing said at least one removable endwall from said enclosure;
 
(f) at least one means for creating at least one opening in said at least one removable endwall; and
 
(g) at least one means for securing said at least one removable endwall with said at least one opening back into its previous location in said enclosure.
 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    Although the scope of the present invention is much broader than any particular embodiment, a detailed description of the preferred embodiment follows together with drawings. These drawings are for illustration purposes only and are not drawn to scale. Like numbers represent like features and components in the drawings. The invention may best be understood by reference to the ensuing detailed description in conjunction with the drawings in which: 
           [0015]      FIG. 1 , illustrates a perspective view of a first embodiment of an inventive electrical panel or enclosure of this invention. 
           [0016]      FIG. 2 , illustrates an exploded view of the inventive electrical panel or enclosure of the invention illustrated in  FIG. 1 . 
           [0017]      FIG. 3 , illustrates a top view of a second embodiment of an inventive removable endwall of this invention. 
           [0018]      FIG. 4 , illustrates a top view of a third embodiment of an inventive removable endwall of this invention. 
           [0019]      FIG. 5 , illustrates a perspective view of a fourth embodiment of an inventive electrical panel or enclosure of this invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0020]    The removable endwall plate of this invention alleviates the need for measuring and transposing conduit profiles on a fixed blank endwall. This invention also eliminates the time spent awkwardly aligning conduit to an endwall with pre-cut knockouts. Furthermore, this invention also allows contractors/electricians/installers to remove the endwall, as needed, and directly transpose conduit profiles after the panel has been hung or mounted onto the wall or similar surface. Cutting the required hole or openings for a conduit, such as, a wire conduit, using this invention is an easier and much more efficient method. 
         [0021]    The removable endwall plate invention provides a convenient method of passing incoming or outgoing wire conduits through the top and/or bottom of an electrical panel or enclosure. This also allows installing the electrical panel or enclosure before cutting openings, and handling a small endwall plate or panel instead of the entire electrical panel or enclosure when adding or creating openings. 
         [0022]    This invention, as stated earlier, comprises of at least one removable endwall plate that can be removed before or after installing an electrical panel or enclosure onto the wall. Removing the endwall plate provides a convenient method for the contractor/electrician/installer to create openings of any size and location required for conduits used while wiring the electrical panel or enclosure. The removable endwall plate can either be blank or consist of knockouts (pre-defined weakened area in a panel used in the industry to create openings as needed) that the contractor/electrician/installer can remove to create the desired opening(s). This invention will reduce hours of wiring time from an electrical panel or enclosure installation. 
         [0023]      FIG. 1 , illustrates a perspective view of a first embodiment of an inventive electrical panel or enclosure  23 , of this invention. The electrical panel or enclosure  23 , comprises of a base or bottom frame  14 , a top or upper frame  24 , a wrapper  50 , a top removable endwall  20 , and a bottom removable endwall  10 . The base frame  14 , comprises of a bottom front frame  16 , a bottom first side frame  17 , a bottom rear frame  18 , and a bottom second side frame  19 . The wrapper  50 , typically comprises of a first side panel  40 , having a bottom side edge  37 , and a top side edge  47 , a rear or back panel  30 , comprising a bottom rear edge  38 , and a top rear edge  48 , and a second side panel  60 , having a bottom side edge  39 , and a top side edge  49 . For some applications the wrapper  50 , may have a front panel or front door (not shown). The top or upper frame  24 , comprises of a top front frame  26 , a top first side frame  27 , a top rear or back frame  28 , and a top second side frame  29 . For most applications it is preferred that the bottom frame  14 , is permanently secured to the wrapper  50 , such that the bottom side edge  37 , is secured to the bottom side frame  17 , the bottom back edge  38 , is secured to bottom back frame  18 , and that the bottom side edge  39 , is secured to the bottom side frame  19 . Similarly, for most applications it is preferred that the top frame  24 , is permanently secured to the wrapper  50 , such that the top side edge  47 , is secured to the top side frame  27 , the top back edge  48 , is secured to top back frame  28 , and that the top side edge  49 , is secured to the top side frame  29 . The removable bottom endwall  10 , is preferably secured to the bottom frame  14 , using at least one securing means  12 . The removable top endwall  20 , is preferably secured to the top frame  24 , using at least one securing means  22 . In a typical installation one would pass incoming or outgoing wire conduits through either the top endwall  20 , and/or bottom endwall  10 , of the inventive electrical panel or enclosure  23 . For the ease of understanding the other electrical and mechanical components of the inventive electrical panel or enclosure  23 , are not shown. 
         [0024]      FIG. 2 , illustrates an exploded view of the inventive electrical panel or enclosure  23 , of the invention illustrated in  FIG. 1 .  FIG. 2 , clearly shows the removable top endwall plate  20 , and the removable bottom endwall plate  10 , of the enclosure or wrapper  50 . The removable bottom endwall plate  10 , and the removable top endwall plate  20 , are preferably blank plates  10 ,  20 , when they are initially assembled. However, the plates  10 ,  20 , can have one or more specific sized knockout or knockout clusters (shown in  FIGS. 3 and 4 ). The removable endwall plate  10 ,  20 , can be removed or assembled to the base frame  14 , top frame  24 , with the use of hardware or securing means  12 ,  22 , respectively. The hardware or securing means  12 ,  22 , can be selected from a group comprising, screws, nuts, bolts, welds, to name a few. For the ease of understanding the bottom frame  14 , and the top frame  24 , is shown separated from the wrapper  50 , however, for most applications the bottom frame  14 , and the top frame  24 , are permanently secured to the wrapper  50 . The removable bottom endwall  10 , has at least one opening or location  11 , to secure the removable bottom endwall  10 , to the bottom frame  14 , via at least one securing means  12 . Similarly, the removable top endwall  20 , has at least one opening or location  21 , to secure the removable top endwall  20 , to the top frame  24 , via at least one securing means  22 . Thus, for most applications the removable bottom endwall  10 , and the removable top endwall  20 , are removable panels or plates from the inventive electrical panel or enclosure  23 . It should be appreciated that the endwall  10 , could be secured to the bottom or top surface of the frame  14 . Similarly, the endwall  20 , could be secured to the bottom or top surface of the frame  24 . As illustrated in  FIG. 2 , the endwall  10 , is secured to the top surface of the frame  14 , while the endwall  20 , is secured to the bottom surface of the frame  14 . 
         [0025]      FIG. 3 , illustrates a top view of a second embodiment of an inventive removable endwall  70 , of this invention. The removable endwall  70 , is similar to the bottom endwall  10 , or the top endwall  20 , however, the removable endwall  70 , has either at least one knockout  76 , or at least one hole or opening  75 . The removable endwall  70 , could have at least one opening or location  71 , for securing the removable endwall  70 , to either the bottom frame  14 , or the top frame  24 , of the inventive electrical panel or enclosure  23 . 
         [0026]      FIG. 4 , illustrates a top view of a third embodiment of an inventive removable endwall  80 , of this invention. The removable endwall  80 , is similar to the removable endwall  10 ,  20 ,  70 , however, the removable endwall  80 , has either at least one removable knockout  76 , or at least one hole or opening  75 . The removable knockout  76 , could further comprise of one or more knockouts, such as, knockout  86 ,  87 ,  88 , having a weakened outline  81 ,  82 ,  83 , respectively. The knockouts  86 ,  87 ,  88 , could also have one or more perforations or tabs  96 ,  97 ,  98 , respectively, along the weakened outline  81 ,  82 ,  83 , respectively. This concept of a knockout within a knockout allows an operator or installer to select the opening that is desired and remove each knockout  76 ,  86 ,  87 ,  88 , as desired or needed for the application. Additionally, having one or more perforations or tabs  96 ,  97 ,  98 , along the knockout outline or weakened area  81 ,  82 ,  83 , allows an installer to easily pop-out a knockout  76 ,  86 ,  87 ,  88 , from the removable endwall  10 ,  20 ,  70 ,  80 , without the use of specialized tools. 
         [0027]      FIG. 5 , illustrates a perspective view of a fourth embodiment of an inventive electrical panel or enclosure  73 , of this invention. The electrical panel or enclosure  73 , has a first removable endwall  70 , secured to a bottom frame  14 , and a second removable endwall  70 , secured to a top frame  24 . The removable endwall  70 , could have at least one knockout  76 , or at least one hole or opening  75 . However, the removable endwall  70 , could be similar to removable endwall  10 ,  20 . As shown in  FIGS. 1 and 2 , the removable endwall  10 ,  20 , do not have an opening, however, when desired, an operator could remove the removable endwall  10  and/or  20 , and create one or more opening  75 . As one can appreciate that it is rather easy for an operator to remove endwall  10 ,  20 ,  70 , and then work on the endwall  10 ,  20 ,  70 , as desired, and then easily secure the endwall  10 ,  20 ,  70 , back in the frame  14 ,  24 . With this invention an operator does not have to manipulate the whole electrical panel or enclosure  23 ,  73 , but only the endwall  10 ,  20 ,  70 . The opening  75 , can be created by methods well known in the art, such as, for example, using a saw, a snip, a cutter, a laser beam, or any other device or tool that can cut a hole or opening in a panel or plate or endwall  10 ,  20 ,  70 . 
         [0028]    The shape of the hole or opening  75 , could be selected from a group comprising, a square shape, a circular shape, an elliptical shape, a triangular shape, a polygonal shape, a jagged shape, to name a few. 
         [0029]    The shape of the knockout  76 , could be selected from a group comprising, a square shape, a circular shape, an elliptical shape, a triangular shape, a polygonal shape, a jagged shape, to name a few. 
         [0030]    The material for the endwall  10 ,  20 ,  70 , could be selected from a group comprising, a metallic material, a plastic material, a fiberglass material, a rubber material, a composite material, to name a few. 
         [0031]    The material for the wrapper  50 , could be selected from a group comprising, a metallic material, a plastic material, a fiberglass material, a rubber material, a composite material, to name a few. 
         [0032]    While the present invention has been particularly described in conjunction with a specific preferred embodiment, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. It is therefore contemplated that the appended claims will embrace any such alternatives, modifications and variations as falling within the true scope and spirit of the present invention.