Abstract:
A containment system for batteries of a data transmission equipment enclosure is disclosed. The system includes a number of identical side plates and integral top flanges for positioning around the batteries along with a front retention bar that has a series of slots for mating with slots formed in the side plates. A top channel frame member is connected to each of the side plates and to the enclosure. The system when installed in an enclosure prevents sideward, frontward and damaging upward movements of the batteries in response to seismic events. The system is careful, however, not to block the region under the batteries so that a heating pad can easily be installed if desired.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field Of The Invention  
           [0002]    The present invention relates to a containment system and more particularly to a simple, reliable and inexpensive system for restraining batteries in an equipment enclosure to protect the batteries during seismic events.  
           [0003]    2. Description Of The Related Art  
           [0004]    Equipment enclosures for telecommunications, cable television and other data transmission equipment are in use around the country, often as outdoor stand-alone units. Each enclosure generally has an upper compartment or chamber for electronic components, a lower compartment for back-up batteries to provide power should commercial power fail, and side compartments for other equipment. In some areas of the country the enclosures are subjected to seismic events, such as earthquakes. Hence, it is desirable to restrain the batteries in some fashion. Previous systems included brackets and straps, typically constraining the batteries from their bottom surfaces or their bottom portions. When this is done, it is difficult to place a heating pad or heating plate beneath the batteries because of the restraining equipment. Heating batteries may be desirable since certain types of batteries operate most efficiently and with longer life at specific temperatures, often above ambient. Hence, depending upon ambient weather conditions, heating the batteries may be justified.  
         BRIEF SUMMARY OF THE INVENTION  
         [0005]    The difficulties encountered by previous devices have been overcome by the present invention. What is described here is a containment system for a battery compartment of an equipment enclosure comprising a plurality of side plates, each side plate adapted to be placed along side a battery, a plurality of top flanges, each top flange being connected to a corresponding side plate, a front retainer bar adapted to engage each of the plurality of side plates for preventing forward movement of the batteries, and an extended top frame member connected to each side plate for connecting each of the side plates together and to the enclosure.  
           [0006]    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 present invention is an enclosure containment system which is simple, reliable and inexpensive. Another feature of the present invention is to provide a containment system for batteries of an equipment enclosure so as to protect the batteries against seismic events. Still another object of the present invention is to provide a containment system for restraining batteries of an equipment enclosure against seismic events without blocking the space under the batteries within the enclosure. Yet another feature of the present invention is to provide a containment system for a battery compartment of an equipment enclosure without using any loose hardware or straps. A further advantage of the present invention is to provide a battery containment system for an equipment enclosure which is modular and thereby able to fit in a number of different size enclosures and constrain the battery or batteries regardless of their number.  
           [0007]    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 embodiments read in conjunction with the accompanying drawing provided herein. 
       
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING  
       [0008]    [0008]FIG. 1 is a downward looking isometric view of five aligned side plates of the present invention.  
         [0009]    [0009]FIG. 2 is an isometric view of the five side plates of FIG. 1 and two batteries placed between three of the side plates.  
         [0010]    [0010]FIG. 3 is an upward looking isometric view of a variation side plate.  
         [0011]    [0011]FIG. 4 is a front elevation view of the side plate of FIG. 3 and a restrained battery.  
         [0012]    [0012]FIG. 5 is a partial exploded isometric view of the five side plates of FIG. 1, a front retainer bar and a channel connector.  
         [0013]    [0013]FIG. 6 is an elevation view taken along line  6 - 6  of FIG. 5.  
         [0014]    [0014]FIG. 7 is an isometric view of the five side plates, the front retaining bar and the channel connector of FIG. 5 and four constrained batteries.  
         [0015]    [0015]FIG. 8 is an isometric view of the five side plates, the retainer bar, the channel connector and four constrained batteries of FIG. 7 installed in a lower chamber of an equipment enclosure. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0016]    While the present invention is open to various modifications and alternative constructions, the preferred embodiments 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 forms 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.  
         [0017]    The simplicity, reliability and inexpensiveness of the present invention may best be exemplified by referring to FIG. 1 where there is shown a portion of the containment system in the form of five side plates,  10 ,  12 ,  14 ,  16  and  18 . As can be seen, each of the plates is identical to each other and may be used in left or right facing directions. For example, the side plate  10  faces to the right and the side plates  12 ,  14 ,  16  and  18  face to the left. Each side plate includes a flat vertical panel, such as the vertical panel  20  of the side plate  18  and an integral top flange, such as the top flange  22 . The vertical panel of each of the side plates has an irregular but symmetrical peripheral edge  23 . The peripheral edge is symmetrical about a vertical axis represented by the vertical center line  24 . The symmetry also extends to the top flanges and allows each side plate to be left or right facing.  
         [0018]    The irregular peripheral edge includes a generally horizontal bottom edge  30 , and opposed arm edges  32 ,  34  for forming slots  36 ,  38  with vertical edges  40 ,  42 , respectively. The side plate narrows in its upper portion as it transitions to the top flange  22 . The top flange includes a horizontal panel  44  connected to a step down panel  46 . Two sets of peripheral openings  50 ,  52  and  54 ,  56  are provided along the vertical edges  40 ,  42 , respectively, while three large horizontally disposed openings  60 ,  62  and  64  are provided at the top of the vertical panel. Fastener openings  70 ,  72  and  74  are provided in the top flange.  
         [0019]    The side plates may be made of aluminum plate having a thickness of about 0.125 inches and may easily be formed by a stamping operation to create the peripheral edge, the holes and the bends. The side plates may also be made of steel having a thickness of about 0.06 to 0.09 inches if more strength is required.  
         [0020]    Referring now to FIG. 2, the five side plates are again shown and in addition two batteries  80 ,  82  are illustrated in stalls created between the three side plates  10 ,  12  and  14 . As depicted in the drawing, the side plates are modular in that any number of plates can be spaced in a horizontal direction to contain any number of batteries. In areas of high seismic events, referred to as Seismic Four Events, the relationship of plates to batteries is “n” side plates to “n- 1 ” batteries. Depending upon expected seismic events, a different relationship may be used. It may also be seen that the vertical panels of the side plates abut the vertical sides of the batteries, such as the vertical side  84  of the battery  82 . The step down panel  46   a  of the top flange of the side plate  14  is located close to but spaced from the top of the battery, such as the top  86  of the battery  82 . Further, it may be observed that the arm  32   a  of the side plate  14  extends beyond the front surface  88  of the battery  82 . Finally, it is noted that the bottom edge  30   a  of the side plate  14  is spaced from a bottom  90  of the battery  82 . This spacing and the spacing between the top flange and the battery top mean that another device may easily be located under the batteries, such as a heating pad or plastic sheet as will be explained hereinbelow.  
         [0021]    Referring now to FIGS. 3 and 4, there is shown a modified side plate  100 . This side plate is very similar to the side plates of FIG. 1 except that instead of a step down panel  46 , there is a depending flange  102 . A lower edge  104  of the flange  102  is slightly spaced from a battery  82   a . As with the side plates of FIG. 1, the side plate  100  prevents potentially damaging horizontal or lateral movement of the batteries when the side plates are connected as described below.  
         [0022]    Referring now to FIG. 5, there again is illustrated the five side plates  10 ,  12 ,  14 ,  16  and  18  where they are attached to an extended top frame member  110  having a generally channel shaped cross section. As shown in FIG. 7, the channel frame member  110  includes openings, such as the opening  112 , which align with the openings in the top flanges so that a fastener, such as a screw or rivet (not shown), may attach the side plates to the channel frame member.  
         [0023]    There is also shown a front retainer bar  120 , FIG. 5, which has an L-shaped section, FIG. 6, including a vertical portion  122  and a horizontal portion  124 . Five slots  130 ,  132 ,  134 ,  136  and  138  are formed in the vertical portion  122  of the retainer bar. Each of these slots mate with a corresponding slot in the side plates, such as the bar slot  138  mating with the slot  36  in the side plates  18 . A view of the retainer bar engaging the slots of the side plates is shown in FIGS. 7 and 8. When the retainer bar is in place, the batteries are restrained from forward movement. Thus, when the batteries are installed in a battery compartment or chamber  139  of an enclosure, such as shown in FIG. 8, each of the four batteries shown are restrained from lateral movement by the side plates, from forward movement by the retainer bar and from damaging upward movement by virtue of the side plates/top flanges and the connected channel frame member. This arrangement protects the batteries from movement due to seismic events without blocking the space under the batteries. A heating pad  140  or a plastic sheet is usually placed on the bottom surface of the equipment enclosure  142 . The pad acts to keep the batteries at a predetermined optimum storage temperature regardless of ambient temperatures, and the pad and the sheet provide low friction surfaces to facilitate moving the batteries into or out of the enclosure. Thus, the bottom  90   a  of the battery slides on the pad or sheet and not on the metal of the enclosure.  
         [0024]    Referring now to FIGS. 7 and 8, the integral side plates/top flanges, the retention bar and the channel frame member package the batteries. More batteries (or less) may also be packaged simply by adding or subtracting side plates, and by lengthening or shortening the retention bar and the channel frame member. Of course, as shown, a larger channel frame member can be used with a smaller number of batteries. The same is true for the retention bar. For example, a five battery retention bar with six slots may function with only four batteries and five side plates or with four batteries and two side plates.  
         [0025]    The top extended channel frame member includes a second set of openings, such as the opening  150  located along an outer arm  152 , which may be used to connect the channel frame  110  to a frame member (not shown) of the enclosure  142 .  
         [0026]    In operation, a determination is made of the number of batteries to be restrained. A plurality of side plates equal to the number of batteries plus one (or less if the area is more stable) are selected and attached to a channel frame member of appropriate length or greater length. Attachment is occasioned by fasteners received by the aligned openings in the channel frame member and the top flanges. The channel frame member is attached to the equipment enclosure in any suitable manner well known to those familiar with equipment enclosures. After the heating pad or low friction plastic sheet is installed, the batteries are then inserted into the stalls created between the side plates. After the batteries are in place, the retention bar, of at least a length to extend across all of the batteries, is lowered into the front slots of the side plates.  
         [0027]    With the retention bar in place, the batteries are restrained from movement sideways by the side plates, or very far upwardly by the step flanges/top flanges or forwardly by the retention bar. Downward and backward movements are prevented by the floor and the wall or frame of the enclosure, respectively. Therefore, in the case of a seismic event, the batteries are prevented from damage or dislodgement.  
         [0028]    An advantage of the inventive apparatus is that access to the region beneath the batteries and above the enclosure bottom panel is allowed so that the heating pad or even a hot or cold plate may be used, if necessary or desirable to maintain the batteries at a specific temperature or within a specific temperature range.  
         [0029]    The specification describes in detail two embodiments of the present invention. Other modifications and variations will, under the doctrine of equivalents, come within the scope of the appended claims. For example, other geometries for the side plates, the retention bar and the channel frame may be developed and used but are considered equivalent structures. Also, less side plates may be used if the level of protection needed is lower. For example, for more stable areas, side plates may be used for every four batteries. The thickness and material used is also dependant on the stability of the area in which the system is to be used. Stronger side plates should be used in less stable areas. 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.