Abstract:
An extension housing for a data transmission pedestal is disclosed. The extension has an upper portion essentially identical to the upper portion of a base of a pedestal and a lower portion essentially identical to the lower portion of a cover section of a pedestal. The extension is simple and inexpensive and can be used singly or in multiple quantities depending upon the pedestal height to be achieved. The use of extensions alleviates inventory of different size pedestals and allows quick and easy height adjustments in the field.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an extension for a data transmission pedestal and more particularly to a data transmission pedestal extension that minimizes inventory costs and allows for field expansion of existing pedestals. 
     2. Description of the Related Art 
     Data transmission lines connect central distribution offices to customer locations usually through buried underground cable. In close vicinity to a customer&#39;s location, the data transmission cable is brought above ground where preselected lines of the cable are connected to an underground service line from the customer, whose line is also brought above ground. The appropriate cable lines and service line are connected by the use of terminal blocks mounted to grounded frames. These above-ground connections are then covered by a pedestal to protect the electrical connections against weather and other environmental factors, as well as against tampering and vandalism. The pedestal may be opened to facilitate service of the lines and cable and to allow additional service lines to be connected to the cable. 
     At times, there is a need to extend the height of a pedestal due to tall grass or deep snow or after there is a change in the final grade of the surrounding terrain. Such a change necessitates a new longer pedestal and a time consuming and expensive exchange. Such an exchange also requires a disconnection of the cable and service lines thereby interrupting service to customers. Further, there is the disadvantage of requiring that a large inventory of different size pedestals be available to accommodate different height requirements. 
     BRIEF SUMMARY OF THE INVENTION 
     The difficulties encountered by the above mentioned problem have been overcome by the present invention. What is described here is a data transmission pedestal extension comprising a housing having a front wall, a left side wall, a right side wall and a rear wall, the housing being divided into an upper portion and a lower portion, the lower portion having walls with larger dimensions than the walls of the upper portion, the lower portion having an open bottom for receiving an upper portion of a pedestal base or the upper portion of another pedestal extension in a telescoping relationship, the upper portion also having an open top and dimensioned to be received by the lower portion of a pedestal cover or the lower portion of another extension housing, also in a telescoping relationship, and openings formed in the upper and lower portions of the housing. 
     There are a number of advantages, features, and objects achieved with the present invention which are believed not to be available in earlier related devices. For example, one advantage is that the pedestal extensions are simple to use and relatively inexpensive. Another object of the present invention is to provide a pedestal extension which will minimize inventory costs. Still another aim of the present invention is to provide a pedestal extension that may be used in the field with existing pedestals. A further advantage of the present invention is to provide a pedestal extension that may be used in multiple numbers thereby adding flexibility in constructing a pedestal with the proper height. 
     A more complete understanding of the present invention and other objects, advantages, and features thereof will be gained from a consideration of the following description of the preferred embodiment read in conjunction with the accompanying drawing provided herein. 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
     FIG. 1 is a right rear isometric view of a data transmission pedestal illustrating the extension of the present invention. 
     FIG. 2 is an enlarged isometric view of the extension shown in FIG.  1 . 
     FIG. 3 is a rear elevation view of the pedestal extension shown in FIG.  2 . 
     FIG. 4 is a top plan view of the pedestal extension shown in FIGS. 2 and 3. 
     FIG. 5 is a left side elevation view of the pedestal extension shown in FIGS. 2-4. 
     FIG. 6 is a front elevation view of the pedestal extension illustrated in FIGS. 2-5. 
     FIG. 7 is right side elevation view of the pedestal extension illustrated in FIGS. 2-6. 
     FIG. 8 is an enlarged isometric view of the pedestal cover section shown in FIG.  1 . 
     FIG. 9 is a left side view of the pedestal cover section shown in FIG.  8 . 
     FIG. 10 is a left rear isometric view of the pedestal base section shown in FIG.  1 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     While the present invention is open to various modifications and alternative constructions, the preferred embodiment shown in the drawing will be described herein in detail. It is understood, however, that there is no intention to limit the invention to the particular form disclosed. On the contrary, the intention is to cover all modifications, equivalent structures and methods, and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims. 
     Referring now to FIG. 1, a data transmission pedestal with an extension is designated generally by the reference numeral  10 . The pedestal is an elongated housing defined by a cover section  12  and a base section  14 . To give the pedestal extended height, a pedestal extension  16  is shown attached to the pedestal. A fuller disclosure of a data transmission pedestal is contained in U.S. Pat. No. 6,198,041 which disclosure is incorporated here by reference. 
     An interior chamber is formed by the pedestal housing. The housing includes a front wall  20 , a left side wall  22 , a right side wall  24 , a rear wall  26  and a top wall  28 . The simplicity and relative low cost of the extension may be seen by referring to FIGS. 2-7. The extension  16  includes the four walls  20 ,  22 ,  24 ,  26  and is divided into an upper portion  30  and a lower portion  32 . These walls also form a housing. As can be seen, the upper portion has four walls  20   a ,  22   a ,  24   a ,  26   a  which have smaller dimensions than the walls  20   b ,  22   b ,  24   b ,  26   b  of the lower portion. This allows the upper portion to be received in a telescoping manner by the cover  12  of the pedestal or by another pedestal extension. The upper portion  30  of the extension has the same interior arrangement as an upper portion of the base  14  of the pedestal. In the upper portion of the extension, attached to inner surfaces  33 ,  35  of the walls  22   a ,  24   a , respectively, there are oppositely disposed mounting channel members  34 ,  36  for receiving the flexible legs of a mounting plate (not shown) whereby the mounting plate may be removably attached to the extension  16  in the same way that it is attached to the base of the pedestal. 
     Also located in the upper portion  30  of the extension is a first opening  40  mounted in the right side wall  24   a . The first opening  40  is partially covered by a bracket  44  with a thread hole to mount a threaded fastener  46 . The upper portion  30  also includes a flexible tab element  48  having a cylindrical projection  50  at its end. As will be explained, the flexible tab and projection are cammed out of position when the extension is telescoped into a cover section or another extension and when full engagement is reached the tab springs back and the projection enters an opening in the cover section or other extension to create an interference fit. 
     The lower portion  32  of the extension includes a hole  52  in the left side wall  22   b  and a slot  54  in the right side wall  24   b . The hole  52  is positioned to receive a cylindrical projection, like the projection  50 , of another extension or of a base section to create the interference fit mentioned above. The slot  54  receives a fastener, like the fastener  46 , from another extension or from a base section. The slot slides past the fastener as the smaller upper portion of the base section or of another extension are engaged. When they are fully engaged, the projection springs into the opening  52  and the right wall  24   b  is flanked by the upper portion wall of a base section or other extension and the fastener head. The fastener may then be rotated inwardly to create a friction fit between the extension and the engaged upper portion. 
     The fastener  46  includes a bolt surrounded by a tamper-proof washer. The bolt is restrained by the bracket  44  which is attached to the upper portion  30  of the extension by suitable fasteners such as rivets. A fastener and bracket  60 ,  62  are mounted to an upper portion  64  of the base section  14 , FIG.  10 . The upper portion of the base section also includes a flexible tab  70  and a cylindrical projection  72 , and two opposing channel members  74 ,  76 . The base channel members  74 ,  76  are similar to the extension channel members  34 ,  36 , the flexible tab  70  and the projection  72  are similar to the tab and projection  48 ,  50  of the extension, and the fastener  60  and the bracket  62  are generally similar to the fastener  46  and the bracket  44  of the extension. Also, the upper portion  64  of the base section includes smaller dimensioned walls  20   c ,  22   c ,  24   c  and  26   c  which are essentially identical to the upper portion walls  20   a ,  22   a ,  24   a ,  26   a  of the extension. It may now be appreciated that the telescoping upper portions of the extensions and the upper portion of the base part are essentially identical so that either may be connected to another extension. 
     The cover section  12  of the pedestal includes a slot  80  in the right wall  24 , FIG. 8 and a hole  82  in the left wall  22 , FIG.  9 . The placement and function of the slot  80  and the hole  82  are identical to the slot  54  and hole  52  of the extension  16 . The hole  82  receives a projection, such as the projection  50  of an extension or the projection  72  of a base portion. Similarly the slot  80  receives the fastener  46  of the extension or the fastener  60  of the base section. Either another extension or a cover section may be connected to the extension  16 . This enhances the flexibility of the extension; one or more may be used to extend the height of a pedestal depending upon the requirements of a specific location. Meanwhile, inventory is minimized because each extension is identical (within a size category). 
     The material of the extension is structural foam, such as high density polyethylene, having walls of about 0.19 inches. The height of the extension is approximately eighteen inches of which four inches relates to the upper portion and fourteen inches relates to the lower portion. Thus, each extension is capable of adding fourteen inches to the height of a pedestal. Length and width vary depending on the length and width of the pedestal. Generally these lengths and widths range from about 8.04 by 5.69 inches to about 14.31 inches by 11.81 inches. 
     In operation, an extension may be added to a pedestal simply by removing the pedestal cover section and mounting plate from the base section and telescoping the lower portion of the extension over the upper portion of the base. The tab locking mechanism will automatically lock the extension to the base and thereafter, the fastener may be tightened to prevent separation. Thereafter, the mounting plate is engaged to the extension and the pedestal cover section is replaced over the upper portion of the extension. Of course, a second extension may be mounted on a first extension. The first extension increases the height of the pedestal by fourteen inches. A second extension will increase the height of the pedestal by another fourteen inches or a total of twenty-eight inches. It should be appreciated that the height of the extension may be more or less than fourteen inches and more than two extensions may be used. To separate the cover section from an extension or one extension from another extension, the fastener is loosened and the projection is dislodged from the hole  52  simply by pushing the projection inwardly into the interior of the housing while at the same time, lifting upwardly on the cover section or the other extension. 
     It is now apparent that pedestal inventory may be greatly reduced by requiring only pedestal bases and standard covers and extensions. The final height of the pedestal is determined by the number of extensions used if each extension is of the same height. Secondly, it is now apparent that extensions may be added to existing pedestals without disruption of service or disconnection of the cable or any of the service lines. Finally, it is apparent that as many extensions as are required may be used since each extension telescopes over another extension or the base section of the pedestal and each extension includes the same two connecting mechanisms that exist on the pedestal base section. Further, each extension also includes the mounting channel members so that the mounting plate may easily be connected to and disconnected from the uppermost extension in exactly the same manner that the mounting plate operates with the pedestal base section 
     The specification describes in detail an embodiment of the present invention. Other modifications and variations will, under the doctrine of equivalents, come within the scope of the appended claims. For example, changing the dimensions to match existing pedestals or using different connecting mechanisms are considered equivalent structures. Still other alternatives will also be equivalent as will many new technologies. There is no desire or intention here to limit in any way the application of the doctrine of equivalents.