Abstract:
An network interface device (NID) cabinet has removably mounted or fixedly mounted cable spools. The NID cabinet is a small enclosure, typically made of plastic, which sits on the outside wall of an end user&#39;s building, such as a home or office. Pre-terminated cables are spooled around each cable spool, and the cable connector at one end of each cable is connected to a network interconnection junction within the NID cabinet. A series of interlocking mounting features are formed on both the cable spool and the mating NID cabinet back wall. Two different types of mounting features enable the cable spool to be removably or fixedly mounted within the NID cabinet. When fixedly mounted, the cable spool can still be removed from the NID cabinet, but only if the spooled cabled is completed un-spooled and removed from the cable spool.

Description:
RELATED APPLICATIONS 
       [0001]    This Patent Application claims priority under 35 U.S.C. 119(e) of the co-pending U.S. provisional patent application No. 62/153,338, filed on Apr. 27, 2015, and entitled “REMOVABLE SPOOL FOR OPTICAL FIBER STORAGE,” which is hereby incorporated by reference in its entirety. This Patent Application also claims priority under 35 U.S.C. 119(e) of the co-pending U.S. provisional patent application No. 62/153,351, filed on Apr. 27, 2015, and entitled “FASTENER FREE SPOOL FOR OPTICAL FIBER STORAGE,” which is hereby incorporated by reference in its entirety. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention is generally directed to optical fiber storage. More specifically, the present invention is directed to a removable spool for optical fiber storage within a network interface device (NID) cabinet. 
       BACKGROUND OF THE INVENTION 
       [0003]    Communications networks, such as cable television, internet and telephone networks, rely on physical transmission cables, such as optical fibers, to interconnect various points within the network. The last leg of such networks is typically the connection between an end user&#39;s physical location, such as a house or business office, and a nearby network junction location, such as a junction box located proximate the end user&#39;s physical location. The network transmission signal is split at the junction box, and multiple last line cables are connected from the junction box to proximate end user locations. A network interface device (NID) cabinet is typically installed on the side wall or proximate the side wall of the end user&#39;s building. The NID cabinet is a small enclosure, typically made of plastic, with a front opening door for access to the interior. A last line cable is strung between the junction box and the NID cabinet. A first end of the last line cable is fitted with a cable connector that mates with a corresponding network interface connector in the junction box. A second end of the last line cable is fitted with a cable connector that mates with a corresponding network interface connector in the NID cabinet. The NID cabinet includes a network interconnection junction having at least two network interface connectors. One network interface connector is configured to mate with the cable connector of the inside wiring cable. Another network interface connector is configured to mate with the cable connector of the last line cable. The network interconnection junction provides an interconnection between the last line cable and the inside wiring cable. 
         [0004]    During building of the end user building, insider wiring is terminated at the NID cabinet. External connection between the NID cabinet and the communication network is performed at a later date. Installation of such external connection requires the running of cable between the junction box and the NID cabinet. The last line cable is cut-to-length to meet the distance between the junction box and the NID cabinet. Since the last line cable is cut-to-length on-site at the point of installation, the line connectors are also connected on-site to the ends of the cut last line cable. Connecting line connectors to the cut ends of the last line cable, also referred to as terminating the cable, is time consuming and requires special equipment. It also requires a clean connection which is not always easily achievable in the field. Terminating the cable on-site is also less precise than terminating the cable in the factory. 
       SUMMARY OF THE INVENTION 
       [0005]    Embodiments are directed to an NID cabinet having removably mounted or fixedly mounted cable spools. The NID cabinet is a small enclosure, typically made of plastic, which sits on the outside wall of an end user&#39;s building, such as a home or office. Pre-terminated cables are spooled around each cable spool, and the cable connector at one end of each cable is connected to a network interconnection junction within the NID cabinet. A series of interlocking mounting features are formed on both the cable spool and the mating NID cabinet back wall. Two different types of mounting features enable the cable spool to be removably or fixedly mounted within the NID cabinet. When fixedly mounted, the cable spool can still be removed from the NID cabinet, but only if the spooled cable is completely un-spooled and removed from the cable spool. Because the cable spool is removable, the NID cabinet may be installed separately during a site survey of the end user location, at which time the required length of cable from an external junction point, such as a junction box, to the NID cabinet is determined. The cable can be brought to the end user location pre-cut and pre-terminated to avoid the need to do time consuming cable cutting, cable termination and cable testing in the field. Pre-terminating the cable eliminates the need for special equipment in the field. Pre-terminating the cable in a factory is cleaner, more precise and more efficient than terminating the cable in the field. 
         [0006]    In an aspect, a network interface device cabinet is disclosed. The network interface device includes a base, a removable cable spool and a lid. The base has an interior cavity with a back wall, wherein the back wall comprises removable mounting features. The removable cable spool is configured for a cable to be spooled about the removable cable spool. The removable cable spool comprises cable spool mounting features configured to removably mate with the removable mounting features on the back wall of the base. The lid is coupled to the base to cover and uncover the interior cavity. In some embodiments, the removable mounting features are integral to the back wall. In some embodiments, the base further comprises an enclosed opening extending from the interior cavity to outside the base through which cable is threaded. In some embodiments, the base further comprises a laterally open-ended slot extending from the interior cavity to outside the base through which the cable passes. In some embodiments, the base further comprises a network interconnection junction having multiple network interface connectors, wherein a first end of the cable has a cable interconnect and the cable interconnect is configured to mate with one of the multiple network interface connectors. In some embodiments, the cable spool comprises a first plate and a second plate between which the cable is spooled. In some embodiments, the cable spool mounting features are disposed on the first plate. In some embodiments, the first plate comprises an interior opening, wherein cable spool mounting features comprise a cable spool radius feature formed from a portion of the interior opening in the first plate. In some embodiments, the removable mounting features comprise a cabinet radius feature extending from the back wall, wherein the cabinet radius feature mates with the cable spool radius feature. In some embodiments, the cabinet radius feature comprises a trapping radius and a radius lip, configured such that the cable spool radius feature is positioned on the trapping radius and between the radius lip and the back wall when the removable cable spool is removably mounted. In some embodiments, the cable spool mounting features further comprise a plurality of cable spool interlocking fingers, further wherein the plurality of cable spool interlocking fingers are formed on the first plate and extend into the interior opening of the first plate. In some embodiments, the removable mounting features further comprise a plurality of cabinet interlocking fingers extending from the back wall and configured to mate with the plurality of cable spool interlocking fingers. In some embodiments, the cable spool is vertically symmetrical and horizontally symmetrical. In some embodiments, the cable spool comprises a plurality of cable spool parts that assemble with and disassemble from each other, wherein the cable when wound around the cable spool prevents disassembly of the plurality of cable spool parts. In some embodiments, the plurality of cable spool parts consists of two cable spool parts. In some embodiments, the two cable spool parts are identically shaped. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]    Several example embodiments are described with reference to the drawings, wherein like components are provided with like reference numerals. The example embodiments are intended to illustrate, but not to limit, the invention. The drawings include the following figures: 
           [0008]      FIG. 1  illustrates a front perspective view of a NID cabinet according to some embodiments. 
           [0009]      FIG. 2  illustrates a front perspective view of the NID cabinet from  FIG. 1  with the lid and cable spools removed. 
           [0010]      FIG. 3  illustrates the removable mounting features of  FIG. 2  in greater detail. 
           [0011]      FIG. 4  illustrates a left back perspective view of the removable mounted cable spool. 
           [0012]      FIG. 5  illustrates a right back perspective view of the removable mounted cable spool. 
           [0013]      FIG. 5  illustrates perspective front views of the removably mounted cable spool. 
           [0014]      FIG. 6  illustrates the fixed mounting features from  FIG. 2  in greater detail. 
           [0015]      FIG. 7  illustrates the fixedly mounted cable spool assembled. 
           [0016]      FIGS. 8-10  illustrate various angles of the two spool parts disassembled. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0017]    Embodiments of the present application are directed to a NID cabinet. Those of ordinary skill in the art will realize that the following detailed description of the NID cabinet is illustrative only and is not intended to be in any way limiting. Other embodiments of the NID cabinet will readily suggest themselves to such skilled persons having the benefit of this disclosure. 
         [0018]    Reference will now be made in detail to implementations of the NID cabinet as illustrated in the accompanying drawings. The same reference indicators will be used throughout the drawings and the following detailed description to refer to the same or like parts. In the interest of clarity, not all of the routine features of the implementations described herein are shown and described. It will, of course, be appreciated that in the development of any such actual implementation, numerous implementation-specific decisions must be made in order to achieve the developer&#39;s specific goals, such as compliance with application and business related constraints, and that these specific goals will vary from one implementation to another and from one developer to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking of engineering for those of ordinary skill in the art having the benefit of this disclosure. 
         [0019]      FIG. 1  illustrates a front perspective view of a NID cabinet according to some embodiments. The NID cabinet  2  includes a base  4  and lid  6  coupled to the base  4 . Within an interior of the base  4  are positioned multiple cable spools. In this exemplary embodiment, the NID cabinet  2  is configured to hold two cable spools, a cable spool  8  and a cable spool  10 . It is understood that alternative configurations can hold a single cable spool or more than two cable spools. Each cable spool is configured to hold spooled cable (not shown). As used herein, “cable” refers to any electrical transmission line having an interior transmission signal medium and an outer insulating layer. In some embodiments, the electrical transmission line is a network communications line such as coaxial cable or optical fiber used in cable television, internet and/or telephone networks. A cable has a first end and a second end, each end terminated by a cable connector. The base  4  also includes a network interconnection junction  5  having multiple network interface connectors. Each network interface connector is configured to mate with a cable connector of cable spooled on one of the cable spools. In the exemplary configuration where the base  4  is configured to house two cable spools, such as in  FIG. 1 , the network interconnection junction  5  includes two network interface connectors, one network interface connector for mating with a cable connecter on a first end of cable spooled around cable spool  8  and another network interface connector for mating with a cable connecter on a first end of cable spooled around cable spool  10 . 
         [0020]    Each cable spool is either fixedly mounted or removably mounted within the base  4  depending on the types of mounting features fabricated on a back wall of the base  4  and on the cable spool. There are two different types of mounting features on the back wall, fixed mounting features and removable mounting features. Each type of mounting feature is permanently fabricated as part of the back wall of the base  4 . In some embodiments, each cable spool is assembled from multiple disparate parts that can be repeatedly assembled and disassembled., as described later in relation to  FIGS. 7-9 . As used herein “fixedly mounted” refers to the cable spool being assembled and fixed to the back wall of the NID cabinet. While in the assembled state, the cable spool is interlocked with the fixed mounting features and locked in position against the back wall of the NID cabinet. Only by disassembling the cable spool into its constituent parts can the cable spool parts be removed from the mounted position against the NID back wall. Spooling cable around the fixedly mounted cable spool prevents the assembled cable spool from being disassembled. As such, in order to disassemble the fixedly mounted cable spool for dismounting, any spooled cable must first be removed. As used herein “removably mounted” refers to the cable spool being assembled and attached to the removable mounting features. While in the assembled state, the cable spool is interlocked with the removable mounting features and locked in position against the back wall of the NID cabinet. However, a cable spool that is removably mounted can be dismounted while fully assembled, either with or without spooled cable still wrapped around the cable spool. 
         [0021]      FIG. 2  illustrates a front perspective view of the NID cabinet  2  from  FIG. 1  with the lid  6  and cable spools  8 ,  10  removed. The base  4  includes an opening  12  through which passes cable spooled on cable spool  8 , and an opening  14  through which passes cable spooled on cable spool  10 . On the back wall  16  are removable mounting features  18  and fixed mounting features  44 .  FIG. 3  illustrates the removable mounting features  18  from  FIG. 2  in greater detail. The removable mounting features  18  include a radius  20 , interlocking fingers  22 , detent protrusions  24  and stop protrusions  26 . The radius  20  includes a trapping radius  31  that rests against the back wall  16  ( FIG. 2 ) of the base  4 , and radius lip  28  positioned away from the back wall  16 . Multiple gussets  30  extend from the radius lip  28 . 
         [0022]      FIG. 4  illustrates a left back perspective view of the cable spool  10 .  FIG. 5  illustrates a right back perspective view of the cable spool  10 . The cable spool  10  is formed from two parts, a spool part  72  and a spool part  74 , which are mated together. In some embodiments, such as that shown in  FIGS. 4 and 5 , the two spool parts  72 ,  74  are identical. The two spool parts  72 ,  74  are shown assembled in  FIGS. 4 and 5 . The two spool parts  72 ,  74  each include mating features for mating together. In some embodiments, the two spool parts  72 ,  74  include similar interconnect mating features as the two spool parts  76 ,  78  of the cable spool  8  shown in  FIGS. 7-9 . The cable spool  10  includes a front plate  32  and a rear plate  34 . Each of the front plate  32  and the rear plate  34  has a radius  36 , interlocking fingers  38 , detent fingers  40  and a radius  42 . 
         [0023]    The cable spool  10  is retained in the NID cabinet  2  by first lifting the cable spool  10  such that radius  36  of the rear plate  34  is directly above the radius  20  on the back wall  16  of the base  4  ( FIGS. 2 and 3 ) and such that the centers of radius  36  of the rear plate  34  and radius  42  of the rear plate  34  in  FIGS. 4 and 5  are in the same vertical plane. Second, insuring that the height of the cable spool allows interlocking fingers  38  on rear plate  34  to clear the interlocking fingers  22  ( FIGS. 2 and 3 ) on the back wall  16 . Third, pushing the cable spool  10  inward towards the back wall  16  of the base  4  until the rear plate  34  of the cable spool  10  contacts the back wall  16  of the base  4 . Fourth, sliding the cable spool  10  downward until the interlocking fingers  38  on the rear plate  34  are guided into and trapped in the interlocking fingers  22  on the back wall  16 , and a lip of the radius  36  on the rear plate  34  is wedged behind the radius lip  28  of the radius  20  ( FIG. 3 ). Fifth, continuing to slide the cable spool  10  downward until the detent fingers  40  on the rear plate  34  snap onto the detent protrusions  24  on the back wall  16 , and the detent fingers  40  on the rear plate  34  rest against the stop protrusions  26  on the back wall  16 . The cable spool  10  can be removed by reversing the steps  1 - 5  above. The architecture could be modified for more robust retention by the detent protrusion. Such an implementation would require an extension of the cable spool detent finger that would allow it to be accessed and pulled outwards towards the front of the NID cabinet. 
         [0024]      FIG. 6  illustrates the fixed mounting features  44  from  FIG. 2 . The fixed mounting features  44  include a radius  46  and a radius  54 . The radius  46  includes a trapping radius  48  that rests against the back wall  16  ( FIG. 2 ) of the base  4 , and radius lip  50  positioned away from the back wall  16 . Multiple gussets  52  extend from the radius lip  50 . Radius  54  has the same configuration as radius  46 , but is aligned upside down relative to the radius  46 . 
         [0025]      FIG. 7  illustrates the cable spool  8  assembled. The cable spool  8  is formed from two parts, a spool part  76  and a spool part  78 , which are mated together. In some embodiments, such as that shown in  FIG. 7 , the two spool parts  76 ,  78  are identical. The cable spool  8  includes a front plate  56  and a rear plate  58 . Both the front plate  56  and the rear plate  58  have a radius  70  and a radius  80 .  FIG. 8  illustrates the two spool parts  76 ,  78  disassembled.  FIGS. 7-10  show various interconnect mating features for the two spool parts  76 ,  78  including snap pair  60 , mate pair  62 , mate pair  64 , mate pair  66  and mate pair  68 . 
         [0026]    The interconnect mating features restrain the two spool parts  76 ,  78  in all directions as they are guided together for a positive locking snap. The two spool parts  76 ,  78  are initially separated and placed at the back wall  16  of the base  4  ( FIGS. 2 and 6 ) such that radius  70  of spool part  76  is positioned above radius  46  ( FIG. 6 ) and radius  80  of spool part  78  is positioned below radius  54  ( FIG. 6 ). The separated spool parts  76 ,  78  are then snapped together such that radius  70  ( FIG. 10 ) is trapped behind radius lip  50  ( FIG. 6 ) and in contact with trapping radius  48  ( FIG. 6 ), and radius  80  is trapped behind radius lip of radius  54  ( FIG. 6 ) and in contact with trapping radius of radius  54  ( FIG. 6 ). The spool parts  76 ,  78  are dimensioned such that they snap together just before the two trapping radii of radii  46 ,  54  ( FIG. 6 ) interfere with the corresponding radii  70 ,  80 . When cable is spooled around the cable spool  8 , the spool parts  76 ,  78  are prevented from separating and therefore the cable spool  8  is prevented from being removed from the fixed mounting features  44 . In this manner, the cable spool  8  is fixedly assembled in the NID cabinet  2  without the use of fasteners. Note that the full gravitational load of the cable is transferred to the upper spool part  76  and does not stress the interconnect mating features which connect the upper and lower spool parts  76 ,  78  since the cable hangs free off the lower spool part  78 . 
         [0027]    In some embodiments, the cable spool  10  has exactly the same radii features and size as the cable spool  8 , and the radius  46  of the fixed mounting features  44  is the same as the radius  20  of the removable mounting features  18 , which enables the cable spool  10  to be mounted on either the removable mounting feature  18  or the fixed mounting features  44 . 
         [0028]    In some embodiments, the cable spool  8  has the same interconnect mating features as the cable spool  10 , and the radius  46  of the fixed mounting features  44  is the same as the radius  20  of the removable mounting features  18 , which enables the cable spool  8  to be mounted on either the removable mounting feature  18  or the fixed mounting features  44 . 
         [0029]    In some embodiments, the outer edges of the rear plate and the front plate are smaller for cable spool  8  than for cable spool  10 . This embodiment is shown in  FIG. 1 . Different sized rear plates and front plates of the cable spool can be used to accommodate spooling of different sized cables. For example, the last line cable used to connect the NID cabinet to a junction box is typically thicker than the inside wiring cable used to connect the NID cabinet to the inside wire in the end user location. Larger sized rear and front plates provide a larger volume within which to spool the larger sized cable. 
         [0030]    In some embodiments, the cable spool is symmetrical from top to bottom (vertically symmetrical), from side to side (horizontally symmetrical) and from front to back. Being symmetrical, the cable spool can be installed upside down and/or front-side back relative to the aforementioned embodiments. 
         [0031]    In the exemplary embodiments shown in  FIGS. 1-10 , the base  4  is configured with removable mounting features  18  for removably mounting cable spool  10  and is configured with fixed mounting features  44  for fixedly mounting cable spool  8 . It is understood that the base can be alternatively configured with the types of mounting features reversed such that the cable spool  8  is removably mounted and the cable spool  10  is fixedly mounted. It is also understood that the base can be alternatively configured with only fixed mounting features such that both cable spools  8  and  10  are fixedly mounted, or the base can be alternatively configured with only removable mounting features such that both cable spools  8  and  10  are removably mounted. In either of these alternative base embodiments, the cable spools are configured with the appropriate mounting features. 
         [0032]    The openings  12  and  14  ( FIG. 2 ) in the base  4  are shown as enclosed openings, which requires cable to be threaded through the openings. Alternatively, the openings can be configured as laterally open-ended slots that enable the cable to simply be slid into the slot. The slot enables the cable spool to be mounted into the base while the cable is externally connected. In this manner, cable can be more easily installed from the junction box to the NID cabinet. For example, the cable spool can be used as a transport device between the factory and on-site. When on-site, one end of the cable spooled to the cable spool is connected to the junction box. As the installer then walks from the junction box to the NID cabinet, cable is un-spooled from cable spool. Once the installer reaches the NID cabinet, the cable un-spooled from the cable spool is slid through the slot in the base, the second end of the cable is connected to the network interface connector and the cable spool is mounted to the removable mounting features. In this manner, the cable spool protects the cable during shipping, and also aids the installer in running cable between the junction box and the NID cabinet. 
         [0033]    The present application has been described in terms of specific embodiments incorporating details to facilitate the understanding of the principles of construction and operation of the NID cabinet. Many of the components shown and described in the various figures can be interchanged to achieve the results necessary, and this description should be read to encompass such interchange as well. As such, references herein to specific embodiments and details thereof are not intended to limit the scope of the claims appended hereto. It will be apparent to those skilled in the art that modifications can be made to the embodiments chosen for illustration without departing from the spirit and scope of the application.