Abstract:
By way of summary, in the preferred form of the invention, the patch panel comprises a manually programmable device that incorporates shunts or dip switches that are readily accessible from the front panel of the device. In the patch panel construction of the invention, a multi-pin connector block is connected to a first circuit board that, in turn, is connected to a second circuit board via a cable connector, thus allowing the signal switching (normalizing) and grounding circuits of the respective jacks to be selectively altered from the front access panel of the device. By manually changing the shunt or dip switch configurations, the respective normalizing and grounding circuits can easily and simply be altered as may be desired without costly system interruption.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to electrical systems. More particularly, the invention concerns a patching device for use in connection with communication systems that permits altering the signal flow paths within selected normalizing and grounding circuits of the communication system from the front panel of the patching device. 
     2. Discussion of the Prior Art 
     Electrical patching equipment is widely used in a variety of different applications for selectively connecting and disconnecting electrical circuits. By way of example, electrical patching equipment is frequently used to make selected circuit connections between a number of types of electrical equipment. More particularly, present day professional communication systems, which include telecommunication, production, post-production, media storage and other devices utilizing transmission equipment, typically embody patch panels for temporarily connecting various circuits. A patch panel or patch board is a device having a number of jacks at which circuits are terminated. In use, patch cords are plugged into the jacks to temporarily connect the selected circuits. 
     Modem day communication systems have numerous work stations and production rooms. In most cases being able to access the equipment inputs and outputs becomes essential. Accordingly, communication system users have long recognized the need for quick access patch panels for flexibility in setup requirements, and have realized the need for a manual patch panel even if it is used only for a service loop, backing up an active router system. 
     In practice, it is highly desirable for communication system users to have a patch panel with numerous electrical configuration possibilities. Location of equipment, adding new equipment and rearranging studio work environments makes it particularly inviting to have quick and easy access to the normalizing and grounding circuits on the patch panel. In addition, it is most desirable in practice to have connect and disconnect capability of the normalizing and grounding circuits for circuit tracing and troubleshooting. However, prior art patch panels of conventional design do not permit altering of the signal paths of either normalized or grounding circuits without shutting down the system and removing the patch panel from the equipment rack. It is this drawback of the prior patch panels that is uniquely overcome by the apparatus of the present invention. 
     SUMMARY OF THE INVENTION 
     It is a primary object of the present invention to provide an improved patch panel for use with a communication system that provides a simple and convenient means for altering selected normalizing and grounding circuits of the communication system without costly system interruption. 
     Another object of the invention is to provide an apparatus of the aforementioned character in which specially constructed banks of contacts, which are readily accessible from the front of the patch panel, can be selectively interconnected to program a particular circuit to full, half, or non-normal and can also be selectively interconnected to program the grounding of a circuit without costly equipment shutdown and without the necessity of removing the patch panel from the equipment rack. 
     Another object of the invention is to provide an apparatus as described in the preceding paragraph in which the contacts are provided in the form of ten-pin header assemblies, the pins of which can be selectively interconnected from the front panel using small, easy-to-manipulate shunts. 
     By way of summary, in the preferred form of the invention, the patch panel comprises a manually programmable device that incorporates shunts or dip switches that are readily accessible from the front panel of the device. In the patch panel construction of the invention, a multi-pin connector block is connected to a first circuit board that, in turn, is connected to a second circuit board via a cable connector, thus allowing the signal switching (normalizing) and grounding circuits of the respective jacks to be selectively altered from the front access panel of the device. By manually changing the shunt or dip switch configurations, the respective normalizing and grounding circuits can easily and simply be altered as may be desired without costly system interruption. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a generally perspective view of a pair of electrical patching systems of the invention mounted on a conventional equipment rack. 
     FIG. 2 is an enlarged, fragmentary front view of one of the patching systems shown in FIG. 1 with the designation strips that overlay the banks of contacts of the apparatus removed. 
     FIG. 3 is an enlarged, cross-sectional view taken along lines  3 — 3  of FIG.  2 . 
     FIG. 4 is a greatly enlarged, generally perspective view of a group of the upper and lower contacts of the apparatus. 
     FIG. 5 is a generally perspective view of a group of contacts similar to FIG. 4, and further illustrating the manner of interconnection of the contacts within the system. 
     FIG  5 A is a generally schematic view of a bank of contacts comprising rows of five upper and five lower contacts with no shunts connected to the contacts to provide a non-normaled with isolated ground connections. 
     FIG. 5B is a generally schematic view of a bank of contacts with two shunts connecting the ground contacts of the bank of contacts to provide a non-normaled with bussed grounds connection. 
     FIG. 5C is a generally schematic view of a bank of contacts with two shunts, each connecting a pair of adjacent end normals to provide a full normaled with isolated grounds connection. 
     FIG. 5D is a generally schematic view of a bank of contacts with two shunts, each connected to a pair of adjacent end normals and one shunt connected to a pair of upper and lower end ground contacts to provide a full normaled with looped grounds connection. 
     FIG. 5E is a generally schematic view of a bank of contacts with two shunts, each connected to a pair of adjacent normals and two shunts each connected to a pair of adjacent end ground contacts to provide a full normaled with bussed grounds connection. 
     FIG. 5F is a generally schematic view of a bank of contacts with two shunts, each connected to a pair of adjacent intermediate normals to provide a half normaled with isolated grounds connection. 
     FIG. 5G is a generally schematic view of a bank of contacts with two shunts, each connected to a pair of adjacent intermediate normals and one shunt connected to a pair of upper and lower end ground contacts to provide a half normaled with looped grounds connection. 
     FIG. 5H is a generally schematic view of a bank of contacts with two shunts, each connecting adjacent intermediate normals and two shunts connecting the adjacent upper and lower ground contacts to provide a half normaled with bussed grounds connection. 
     FIG. 5I is a generally schematic view of a bank of contacts with one shunt connecting a pair of adjacent lower ground contacts to provide a non-normaled with single row bussed grounds connection. 
     FIG. 5J is a generally schematic view of a bank of contacts with a pair of shunts, each connected to a pair of adjacent end normals and one shunt connecting a pair of adjacent lower ground contacts to provide a full normaled with single row bussed grounds connection. 
     FIG. 5K is a generally schematic view of a bank of contacts with a pair of shunts, each connecting a pair of adjacent intermediate normals and one shunt connecting a pair of adjacent upper ground contacts to provide a half normaled with single row bussed grounds connection. 
     FIG. 6 is a generally schematic view illustrating the interconnection of the various components of the patch panel. 
    
    
     DESCRIPTION OF THE INVENTION 
     Referring to the drawings and particularly to FIGS. 1,  2  and  3 , one form of the programmable patch panel of the invention is there shown. More particularly, FIG. 1 shows a pair of the panels  14  of the invention mounted in a conventional equipment rack  16 . As best seen by referring to FIGS. 1 and 3, the patch panels  14  are of identical construction and each comprises a chassis  18  having a front panel assembly  20  that is made up of a front mounting plate  24  and an insulator panel  26 . As depicted in FIG. 1, mounting plate  24  is connected to equipment rack  16  by means of threaded connectors  28 . Removably connected to each mounting plate  24  is a pair of vertically spaced designation strips  30  that are adapted to carry designation indicia that identify the various electrical circuits carried by chassis  18 . 
     Connected to the insulator panel of each of the patch panels  14  is a circuit board  32  having a plurality of circuits to which a plurality of transversely spaced apart ten-pin header assemblies  34  are connected (FIG.  3 ). As shown in FIG. 4, each header assembly  34 , which comprises a part of the programming means of the invention, includes two upper and lower banks of pins, each having five spaced-apart pins that are connected to five insulator blocks  34   a,    34   b,    34   c,    34   d  and  34   e.  In the drawings the contacts of the upper and lower banks are identified by the indicia  36   u,    36 L,  38   u,    38 L,  40   u,    40 L,  42   u,    42 L,  44   u,  and  44 L. In the manner illustrated in FIG.  6  and as well understood by those skilled in the art, the pins or contacts of each five pin bank can be electrically interconnected with the electrical circuits carried by circuit board  32  using appropriate connector cables. As will presently be described, a plurality of shunts can be selectively connected to the aforementioned contacts to alter circuitry signal flow via the upper and lower banks of five pins or contacts of each of the ten-pin header assemblies  34 . 
     Turning once again to FIG. 3, it is to be noted that circuit board  32  is electrically connected to a rearwardly disposed circuit board  46  having a plurality of circuits by connector pins  47  and by means of ribbon connectors  48 . Circuit board  46  is, in turn, connected to a rear panel  50  which cooperates with the circuit board to form a rear interface to which the signal inputs of a plurality of different types of outboard equipment sources OES can be connected. The outboard equipment, such as video and audio tape players and other analog or digital media sources, can be connected to the rear interface via the source cables, such as cables  50   a  and  50   b  which, in turn, are connected to a selected signal jack  51  (see FIG. 6 which illustrates, by way of example, the interconnection of one OES, such as a tape player, with one destination device, such as a tape recorder). 
     Disposed between circuit boards  32  and  46  and suitably interconnected therewith are transversely spaced-apart stacks of leaf springs generally designated in the drawings by the numeral  52 . Each of these stacks comprises a plurality of leaf springs  52   a  and  52   b,  the latter having switch contacts  52   c.  Stacks  52  are of a conventional, readily commercially available construction and can be selectively electrically coupled with selected circuits of the communication system using conventional patch cords  54  (FIG.  2 ). As indicated in FIG. 3, the jack sleeves  51  as well as the ten-pin header assemblies  34  extend through openings  53  and  55  respectively formed in insulator panel  26  and are readily accessible from the front panel assembly  20 . In a manner presently to be described, when the designation strips  30  are removed from the mounting plate  24 , the contacts or pins that make up the upper and lower ten-pin header assemblies  34  are easily accessible to the user so as to permit the selective interconnection therewith of one or more shunts  56  which shunts comprise one form of the connector means of the invention. Shunts  56  also comprise a part of the programming means of the invention for programming a selected circuit to full, half or non-normal and for programming the grounding of a selected circuit. 
     Turning particularly to FIGS. 3 and 6, it is to observed that PC board  46 , which comprises a first interface, is also connected to the outboard equipment destination OED by means of cables  58  and  60  that are, in turn, connected to a jack  62 . By way of example, equipment at the outboard equipment destination can comprise audio and video tape recorders and other analog or digital media equipment. 
     As depicted in FIG. 6, PC board  32  can be connected to a selected one of the contacts of the ten-pin header assembly  34 , such as contact  36   u,  by a connector cable  64 . Similarly, a lower contact, such as contact  36 L, can be connected to PC board  32  by means of a connector cable  66 . As indicated in FIG.  6  and as will be discussed more fully in the paragraphs that follow, connecting contacts  36   u  and  36 L with a shunt will complete a signal path between the first interface and the second or rear interface thereby connecting the signal outputs from the OES and the signal inputs to the OED. 
     Turning to FIGS. 5A through 5K, it is to be observed that the various pins that comprise the ten-pin header assemblies  34  can be interconnected in a variety of ways to easily program a selected circuit to full, half or non-normal and also to program the grounding of a selected circuit. In this regard, the term “normalizing” as used herein means to establish or resume (circuit path) in a normal manner, as between electrical equipment. The upper portion of each of the FIGS.  5 A through  5 K illustrates the manner by which the various pins can be interconnected by shunts. The lower portion of each figure shows the interconnection of the leaf spring contacts of the apparatus with the sleeve, the ring and the tip of the jack Through use of the novel programming means of the invention, the user can, in the manner shown, readily alter the signal paths of both normal and grounding circuits without interrupting the system operation and without removing the patch panel from the equipment rack. It is this important aspect of the invention that distinguishes it from the prior art systems wherein altering the signal paths require system interruption and removal of the patch panel from the equipment rack. 
     Referring specifically to FIG. 5A, this figure depicts a non-normaled with isolated ground arrangement wherein none of the contacts or pins is interconnected by the connector means or connector shunts. FIG. 5B shows a non-normaled with bussed grounds arrangement. In this arrangement, first ground contacts  42   u  and  42 L are interconnected by a first ground shunt  70 . Similarly, second ground contacts  44   u  and  44 L are connected by a second ground shunt  72 . Ground shunts  44   u  and  44 L comprise a part of the second programming means of the invention for programming the grounding of a selected circuit. 
     Referring to FIG. 5, the construction of a ground shunt, such as ground shunt  70  is there illustrated. Shunt  70  as well as all of the remaining normalizing and ground shunts of the invention comprise a body portion  70   a  having pin receiving connector grooves or looping contacts  70   b  and  70   c.  As indicated in FIG. 5, the contacts, or pins identified in FIG. 5, by the numeral  37  are closely received within grooves  70   b  and  70   c  so as to make electrical contact between the pins. 
     Turning next to FIG. 5C, a full normaled with isolated ground arrangement is there depicted. In this arrangement, first normal contacts  36   u  and  38   u  are interconnected by a first normalizing shunt  74 . Similarly, second normal contacts  36 L and  38 L are interconnected by means of a second normalizing shunt  76 . Shunts  74  and  76 , which comprise a part of the first programming means of the invention for normalizing a selected circuit, are of a similar construction to that shown in FIG.  5  and as described in the preceding paragraph. 
     In FIG. 5D a full normaled with loop ground arrangement is illustrated. In this arrangement, contacts  36   u  and  38   u  are once again interconnected by means of normalizing shunt  74  and contacts  36 L and  38 L are interconnected by normalizing shunt  76 . Additionally, ground contacts  44   u  and  44 L are interconnected by ground shunt  72 . 
     In FIG. 5E, a full normaled with bussed grounds arrangement is illustrated. In this arrangement, pins  36   u  and  38   u  are connected by normalizing shunt  74  and contacts  36 L and  38 L are interconnected by normalizing shunts  76 . However, in this arrangement, not only are pins  44   u  and  44 L interconnected by a ground shunt  72 , pins  44   u  and  44 L are also interconnected by ground shunt  70 . 
     Turning to FIG. 5F, a half normaled with isolated grounds arrangement is depicted. In this arrangement, contacts and  38   u  and  40   u  are interconnected by normalizing shunt  74  while contact  38 L and  40 L are interconnected by normalizing shunt  76 . 
     Referring to FIG. 5G a half normaled with looped grounds arrangement is there illustrated. In this arrangement, contacts  38   u  and  40   u  are once again interconnected by normalizing shunt  74  and contacts  38 L and  40 L are interconnected by a normalizing shunt  76 . Additionally, contacts  44   u  and  44 L are interconnected by grounding shunt  72 . 
     In FIG. 5H a half normaled with bussed grounds arrangement is there depicted. In this arrangement, contacts  38   u  and  40   u  are once again interconnected by normalizing shunt  74  and contacts  38 L and  40 L are interconnected by normalizing shunt  76 . Once again, contacts  44   u  and  44 L are interconnected by grounding shunt  72 . In this latest arrangement, however, contacts  44   u  and  44 L are also interconnected by a grounding shunt  70 . 
     In FIG. 5I a non-normaled with single row bussed grounds arrangement is illustrated. In this arrangement, only contacts  42 L and  44 L are interconnected with a ground shunt  72 . 
     Turning to FIG. 5J, a full normaled with single row bussed grounds arrangement is illustrated. In this arrangement, contacts  36   u  and  38   u  are interconnected by means of normalizing shunt  74  and contacts  36 L and  38 L are interconnected by normalizing shunt  76 . Additionally, in this latest arrangement, contacts  42 L and  44 L are interconnected by grounding shunt  72 . 
     In FIG. 5K, a half normaled with single row bussed grounds arrangement is shown. In this arrangement, contacts  38   u  and  40   u  are interconnected by normalizing shunt  74 , while contacts  38 L and  40 L are interconnected by normalizing shunt  76 . Additionally, contacts  42 L and  44 L are interconnected by a grounding shunt  72 . 
     As best seen by referring to FIG. 2, wherein the indicator strips  30  have been broken away from panel  24  to show internal construction, the transversely spaced-apart ten-pin headers are exposed and can be seen to be readily accessible from the front of panel  24 . Accordingly, shunts such as the previously identified shunts  72 ,  74 , and  76  can be manipulated in the manner earlier discussed to interconnect selected pairs of contacts or pins such as pins  38   u  and  40   u,  pins  38 L and  40 L, and pins  44   u  and  44 L. Various other normalizing and grounding connections can, of course, be made in a manner illustrated in FIG. 2 by appropriate manipulation of the connector means or shunts of the invention. 
     From a study of FIGS. 2 and 6, it is readily apparent that when the various jacks of the apparatus are interconnected with the front and rear PC boards in the manner shown by way of example in FIG. 6 and, when the front panel PC board  32  is interconnected with selected contacts of the ten-pin header assemblies, a plurality of the various circuits carried by the apparatus can be interconnected to complete various signal paths between outboard equipment sources and outboard equipment destinations. This unique feature of the apparatus of the invention provides great versatility and ease of circuit altering to the user of the apparatus without requiring equipment shutdown and removal of the patch panels from the equipment rack. 
     Having now described the invention in detail in accordance with the requirements of the patent statutes, those skilled in this art will have no difficulty in making changes and modifications in the individual parts or their relative assembly in order to meet specific requirements or conditions. Such changes and modifications may be made without departing from the scope and spirit of the invention, as set forth in the following claims.