Removable electrical fixtures for modular wall panels
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is directed to an electrical accessory for use on panel wall modules and more particularly to removable assemblies providing connection interfaces for various electrical apparatus. 
     2. Description of the Prior Art 
     Modern offices have frequently utilized removable interior wall partitions to accommodate flexible office planning. In fact, many new building structures are now designed to provide permanent load-bearing exterior walls while relying upon semi-permanent or mobile non-load bearing interior partition walls for a subjective determination of office floor plans. Frequently the mobile wall partitions include a sheet or pad of a sound absorbing material, for example a sheet of fibrous material such as glass fibers. A rigid frame structure surrounds the perimeter of the sound absorbing panel, as disclosed in the Gartung U.S. Pat. No. 3,934,382. The sound absorbing panel is capable of supporting a decorative surface but generally is not capable of supporting any additional direct weight, such as shelving, coat hangers, etc. 
     As can be readily appreciated, it is frequently necessary in an office environment to provide electrical outlets and telephone connections for the rooms partitioned by a modular wall panel. To date, the prior art has primarily relied upon the installation of standard junction box electrical fixtures with the attendant necessity to provide a permanent aperture in the associated wall. Another approach is to use floor-mounted junction boxes. Either approach is not entirely compatible for use with modular wall panel units where rooms are continually being reconfigured. Unnecessary electrical fixtures may be required to be retained in place in wall units to prevent leaving unsightly gaps. Floor-mounted electrical connection units may also prove to be disadvantageously located and difficult to relocate. 
     The prior art to date has not provided a relatively inexpensive and aesthetically pleasing form of removable electrical outlets that can be utilized with modular wall panels. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the invention to provide electrical interface apparatus which can be removably mounted on modular wall panel units without alteration or damage to the wall panels. 
     It is another object of the invention to provide electrical interface apparatus in a modular and aesthetically pleasing configuration. 
     It is another object of the invention to adapt such electrical interface apparatus for providing typical interface functions necessary to office operation such as providing electrical outlets and carrying telephone cables. 
     These and other objects and advantages are accomplished according to the invention by provision of a panel which carries electrical interfacing elements such as standard electrical wall sockets. This panel also bears attachment means insertable between the rigid frame and compressible surface material of a modular wall unit to hold the panel in position. According to another aspect of the invention, a hollow molding is provided which contains similar attachment means for mounting to a modular wall unit. This hollow molding is adapted to interlockingly engage with the interface element bearing panel and may carry and conceal electrical cables such as telephone wires. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The preferred embodiment and best mode presently contemplated for practicing the just summarized invention will now be described in detail in conjuction with the drawings of which: 
     FIG. 1 is a perspective view illustrating two electrical interface apparatus mounting fixtures of the preferred embodiment of the invention mounted in place on adjacent modular wall panel units. 
     FIG. 2 is a sectional view taken at 2--2 in FIG. 1 illustrating a cross-section of the electrical apparatus mounting fixture of the preferred embodiment and its cooperation with a wall panel unit. 
     FIG. 3 is a front view of the socket bearing plate of the preferred embodiment of the invention. 
     FIG. 4 is a perspective view of a molding member according to the preferred embodiment. 
     FIG. 5 is an enlarged view of the section of FIG. 2 more particularly illustrating the cooperation of the mounting fixtures and a wall panel unit. 
     FIG. 6 is a front view illustrating the mounting of a molding member and socket bearing plate according to the preferred embodiment. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 1 illustrates removable fixtures providing electrical interfaces according to the preferred embodiments of the invention. Two such fixtures 11 are illustrated mounted on two adjacent modular wall units 13. The wall units 13 may be of any preferred size and are not shown to scale. 
     The wall units 13 have a rigid frame 15 surrounding the perimeter of a compressible panel 17. These compressible panels 17 may be sound absorptive glass fiber pads constructed as disclosed in the aforementioned U.S. Pat. No. 3,934,382 to Gartung, which is incorporated by reference herein. 
     An electrical interface fixture 11 of the preferred embodiment is shown in greater detail in FIGS. 2 through 5. As there illustrated, the fixture 11 comprises two separate components, a molding 19 and a socket bearing panel 21. The molding 19 and socket bearing panel 21 interlock to form a cooperating assembly as illustrated in FIG. 2. The molding 19 may carry and conceal cables such as telephone cables. 
     The molding 19 is constructed of a pair of L-shaped metal members 23, 25 jointed together to form a U-shaped channel. This channel is closed by a U-shaped capping member 27. The capping member 27 is composed of a first U-shaped member 31 disposed within a second U-shaped member 29. The first U-shaped member 31 is of a width small enough to leave a slight gap 33 on either side between the first and second U-shaped members 29, 31. These gaps 33 permit the capping member 27 to be tightly pressfitted onto the U-shaped channel. 
     The molding 19 is fitted with a mounting plate 35 bearing mounting tabs 38. This plate 35 is attached to the side of one of the L-shaped members 23 of the molding 19 by means of a spacer plate 37. The spacer plate 37 spaces the mounting plate slightly away from the side of the adjacent L-shaped member 23. 
     The socket bearing panel 21 is composed of a socket bearing channel 39 and a channel mounting plate 41. Suitable mounting tabs 49 are attached at each end of the back surface of the channel mounting plate 41. 
     The socket bearing channel 39 is rectangular in shape and bears an arbitrary number of electrical sockets 43. At one end of the socket bearing channel 39, a connector block 44 is provided for attaching the conductors emanating from the electrical sockets 43 to an external plug 47. Other apparatus for interfacing with electrical equipment could be provided in the socket bearing channel according to the invention. 
     To install the electrical fixture 11 in a wall unit 13, the socket bearing panel 21 is first mounted by inserting the tabs 49 and the lower edge 51 of the channel mounting plate 41 into the space between the compressible panel 17 and the rigid frame 13. This mounting is accomplished by placing the mounting plate 41 along a diagonal of a wall unit 13 (FIG. 6) and then pressing the tabs 49 and edge 51 into place while sliding the mounting plate into final position parallel to the bottom edge of the wall unit 13. The resilient nature of the compressible panel 17 facilitates mounting and retaining the socket bearing plate 21. 
     Once the socket bearing panel 21 is installed, the molding 19 may be similarly mounted by placing it diagonally to enable insertion of the tabs 38 between the rigid frame 15 and compressible material 17 of the wall unit 13. The upper edge 42 of the channel mounting plate 41 interlocks with the gap created in the molding 19 by the spacer plate 37, as illustrated in FIG. 2. 
     To remove the fixture 11, an inverse procedure to the one just described is used. The molding 19 and the socket bearing panel 21 are successively slid to a diagonal position to disengage their respective mounting tabs 38, 49. Thus, the insertion and removal of the electrical socket mounting assemblies 11, is accomplished without damaging or altering the wall panels 13. Flexibility in configuration and reconfiguration of spaces partitioned by such panels is thereby facilitated. In addition, the molding member 19 supplements the aesthetically pleasing appearance of the wall units 13. 
     As shown in FIG. 1, several fixtures 11 may be provided on adjacent wall panel sections 13 and may be simply connected together by means of the plug 47. Various modifications in this cooperating structure are apparent. For example, the moldings 19 could extend across the rigid vertical frame members 15 to give the appearance of a continuous assembly. Similarly, the socket bearing channels 39 could be extended to meet one another. These channels 39 could also easily be provided with respective male and female connectors mounted interiorly such that adjacent socket bearing channels 39 could be effectively plugged together while still maintaining a continuous appearance. Such modifications are easily within the purview of one of ordinary skill in the art. In addition, various methods and materials such as plastic could be used for forming the moldings 19 and socket bearing panels 21. Many other modifications are possible without departing from the scope and spirit of the invention. It is therefore to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described above.