Abstract:
A lighted line having an elongate flexible wire-formed bulbless light source is encased in a supportive covering which may include a surrounding rope and tubular sheathing. An electrical power source operatively connected to the wire-formed light source is adapted to energize it to produce light which radiates laterally of the line and emanates through the rope and tubular sheathing.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to a lighted line, and more particularly to a lighted line which has sufficient strength and durability that it may be used in place of a working rope.  
         BACKGROUND OF THE INVENTION  
         [0002]    There are many instances where it would be desirable to have an elongate flexible line which is self-lighted, yet which has the strength and durability found in a normal working rope.  
           [0003]    Specific applications include use as a lifeline for interconnecting people in environments where visibility may be impaired. Examples of such are darkened tunnels, or smoke-filled buildings. In such instances multiple parties may be attached to a single line at spaced intervals therealong. In the past, where non-lighted lines have been used, they have been subject to tripping hazards, entangling on obstacles, and other problems which cause difficult or dangerous situations for the users.  
           [0004]    Further, lighted lines having sufficient strength and durability also could be used for other activities, such as for tethering or supporting in dark or impaired visibility regions, for entertainment value, such as might be used in jump ropes, and many other applications.  
         SUMMARY OF THE DISCLOSURE  
         [0005]    An object of the present invention is to provide a novel self-lighted, strong and durable elongate flexible line which may be used in applications where a usual rope may have been used in the past.  
           [0006]    A further object of the invention is the provision of an elongate self-lighted line which may be segmented by different light characteristics, such as colorations, along the length of the line to denote specific positional arrangements.  
           [0007]    Another object of the invention is the provision of a lighted line which requires only small power requirements, such that it is adaptable for use in environments where the use of lighted lines requiring higher electrical power requirements would be unsafe or could produce hazards.  
           [0008]    A still further object of the present invention is to provide an elongate flexible line which produces light radiating outwardly generally from all sides of the line, such that it is visible from any direction.  
           [0009]    Yet another object of the present invention is to provide a novel lighted lifeline which may be used in darkened or otherwise impaired visibility environments for interconnecting multiple parties in an activity such that the lifeline is visible to alleviate tripping and falling problems and to allow personnel working in such environments, or around moving machinery in low light areas, to be seen more easily.  
           [0010]    These and other objects and advantages of the present invention will become more fully apparent upon reading of the following description in light of the following drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]    [0011]FIG. 1 is a general view of a number of parties interconnected to each other in what could be a darkened, smoky, or other impaired visibility environment, using a lighted line according to the present invention;  
         [0012]    [0012]FIG. 2 is an enlarged view of the lighted line with attachments as it might be used in the illustration of FIG. 1.;  
         [0013]    [0013]FIG. 3 is an enlarged perspective view of a section of the lighted line with portions broken away to illustrate component parts of the line; and  
         [0014]    [0014]FIG. 4 is an electrical circuit diagram illustrating schematically means for powering the lighted line. 
     
    
     DETAILED DESCRIPTION  
       [0015]    Referring to FIG. 1, a plurality of rescue, or other working team members  10 ,  12 ,  14 ,  16 ,  18  are illustrated in a potentially impaired visibility environment, such as a mining tunnel  20 . The members of the team are operatively connected to an elongate connecting line  22 . The lead and tail members of the team  10  and  18 , respectively, are connected generally directly to line  22 , while members  12 ,  14 , and  16  are connected to line  22  via auxiliary lines, or straps,  26 . As is best seen in FIG. 2, line  22  has double locking snap connectors  30  secured to its opposite ends, to which team members  10  and  18  may be connected in a usual fashion. Other double locking snap connectors, such as that indicated generally at  32 , are mounted for sliding along line  22  by having line  22  extending through an eye  32   a  as illustrated in FIG. 3. Carabiners or other styles of connectors indicated generally at  34  in FIG. 2 interconnect straps, or auxiliary lines,  26  to connectors  32 . The opposite sets of ends of lines  26  are operatively connected to individual team members in a usual fashion. Swivel connectors (not shown) also may be used in connecting team members to the line. For example swivels could be connected between connectors  30  and line  22 , and between connectors  32  and lines  26 .  
         [0016]    In this working arrangement as indicated in FIG. 1, connectors  30  at opposite ends of line  32  are connected to the lead and tail team members, while intermediate members  12 ,  14 , and  16 , although generally positioned at spaced intervals along line  22 , are allowed to move longitudinally along the line due to connectors  32  being slidable along line  22 .  
         [0017]    It has been found that when using the usual rope or line, it is difficult for team members to maintain their position in relation to the line, they may get entangled in the line, or trip over such and fall which may cause other team members to fall, or the line may get entangled in other obstacles which presents its own set of problems Further, if there is equipment working in the region and the environment is dark, smoky, or visibility is impaired for some other reason, it is difficult for others to see the workers and their line, again presenting safety hazards.  
         [0018]    In an effort to overcome these and other problems the present device uses a self-lighted line for line  22 .  
         [0019]    Explaining further, and referring to FIG. 3, a section of line  22  is shown on an enlarged scale. The line includes an elongate translucent plastic outer tube or sheathing  40 . Extending longitudinally through the center of tube  40  is an elongate braided rope  42 . The rope  42  is so constructed that light may pass therethrough also. In the illustrated embodiment the rope has openings extending between braided strands through which light may pass. Further, the strands of material in the braided rope may be of a material which allows light to pass therethrough.  
         [0020]    Extending longitudinally through the center of rope  42  is an elongate flexible, bulbless, light wire  44 . In the illustrated embodiment the light wire may be a wire-formed electroluminescent light source in the form of an elongate flexible cable which incorporates a pair of electrodes  46 ,  48  typically made of copper wire. These wires are encased in a surrounding supporting sheath  50  which may be a plastic covering. An electroluminescent material (not shown) is interposed between electrodes  46 ,  48 . The electroluminescent material may typically comprise an electroluminophor powder disposed in a resin. Sheath  50  is made of a flexible translucent material through which light may pass also. The resulting elongated light wire  44  is compact, flexible, and is easily extended through the center of braided rope  42 . As is known in the art, the color, or possibly other differentiation characteristics, of the light which may be emitted by the electroluminescent light source, or line,  44  is generally dependent upon the type of electroluminophor powder selected or may be varied by the characteristics of sheath  50 .  
         [0021]    The flexible elongate light source, or light wire,  44  may be of the type disclosed in U.S. Pat. No. 5,485,355 entitled “Electroluminescent Light Sources.” A source of light wire in the United States which has been found to work well is Live Wire Enterprises at P.O. Box 670081, Flushing, N.Y. 11367.  
         [0022]    A battery pack  60  is shown in FIG. 2 connected to line  22  as an electrical source for operating light source, or wire,  44 . As shown in greater detail in FIG. 4, the battery  5  pack  60  includes a battery  62 , a switch  64 , and an inverter  66 . Terminals  68 ,  70  are operatively connected to electrodes  46 ,  48 . Light source, or wire,  44  includes a pair of terminals  68 ,  70  which are connected to inverter  66 . The inverter  66  also includes input lines  72 ,  74 . Input line  74  is connected directly to one side of battery  62 , while line  72  is connected to one side of switch  64 . Closing of switch  64  operatively connects battery  62  to inverter  66  which provides alternating current to the light source, or wire,  44 . When the switch is open, as shown in FIG. 4, no current flows to light source  44 , and thus no light is produced thereby. When switch  64  is closed current is provided to light source  44  and it is in a luminescent condition to produce light.  
         [0023]    The light source, or wire,  44  produces substantially continuous laterally radiating light along a light emitting path, or region, which is coextensive with the length of light source  44 . In the illustrated embodiment, the full length of line  22  would be lit by light source  44  extending longitudinally therealong. Since sheath  50 , rope  42 , and tubing  40  all permit light to pass therethrough, light emanating from light source  44  will be visible radiating laterally along the length of the line.  
         [0024]    In selected operations, it may be desirable to have different longitudinal sections of a line show in different colors, or have other different light characteristics. Thus, as illustrated in FIG. 1, each one quarter length of line  22 A,  22 B,  22 C,  22 D, may be colored differently from other quarters of the line. For example, one quarter length of the line may be blue, the next quarter length orange, the next quarter length green, and the final quarter length red. This is accomplished by using lines with different color characteristics connected in series along line  22 .  
         [0025]    As is known in the art, the color of the light emitted by an electroluminescent source depends on the type of electroluminophor powder used and/or the characteristics of sheath  50 , and thus lines of different colors may be provided to be connected in series to produce sections of different color along the line.  
         [0026]    A specific embodiment of the invention which has been found to work well to provide a lighted team lifeline  22  as shown in FIGS.  1 - 3  includes four different colored flexible light wires  44  (from Live Wire Enterprises as noted previously) connected in series and passing longitudinally through a 0.6 cm diameter hollow single braided polypropylene rope  42  (336 kg tensile strength). The light wire has four sections, each of which is approximately two meters in length, and each in a different color, such as blue, orange, green, and red, respectively from one end to the other end. The entire length of the braided rope is sheathed with a clear polyvinyl chloride tubing  40 . This line structure has double locking snap connectors, such as that indicated at  30 , connected thereto by having the opposite end portions of line  22  doubled back and bound.  
         [0027]    Battery pack  60  is connected to one end of the line as indicated schematically in FIGS. 2 and 4. Battery  62  may be a 9 volt battery which will power the light source throughout the full length of the line. The three movable double locking snap connectors  32  are slidably mounted on the line intermediate connectors  30  allowing intermediate team members to move freely along the line to provide flexibility of motion to perform activities needed. When the switch  64  is closed, power from battery  62  causes line  22  to light. The multiple line segments of different colors permit the team members to visualize a normal work spacing along the line, but they can move as needed along the length of the line.  
         [0028]    Although the lighted line has been discussed in detail above as being used as a lighted line to which personnel may be attached, the line may also serve other purposes. Since the line has good tensile strength due to the use of the braided rope  42  and good durability due to the enclosing tube sheathing  40  it allows the line to be used in many other applications. Such other applications where a normal rope would be used, but where a lighted line is beneficial are use as support lines, tethers, leashes, such as may be used for controlling animals in nighttime conditions, jump ropes, or for other entertainment purposes.  
         [0029]    The product is strong, durable, and versatile to provide a wide variety of uses where a lighted line may be desirable.  
         [0030]    While a preferred embodiment of the present invention has been described in detail above, various modifications, alterations, and changes may be made without departing from the spirit and scope of the invention as is defined in the following claims.