All rights, including copyrights, in the material included herein are vested in and the property of the Applicants. The Applicants retain and reserve all rights in the material included herein, and grant permission to reproduce the material only in connection with reproduction of the granted patent and for no other purpose.
With conventional systems, many electricians may be needed to install wire. One electrician would pull and feed the wire from a reel (i.e. spool) on an axle that has to be rotated to pay the wire off from the reel, one electrician would feed the wire and possibly lubricate the wire into a conduit, and a third electrician would pull the wire through the conduit. This method of installing wire is very labor intensive and strenuous as the electrician pulling wire from the reel holder may have to pull hard enough to overcome the stationary inertia to cause multiple reels holding 50 or more pounds of wire. For example, if there are seven reels with 50 pounds of wire on each reel, the electrician must pull with a force to overcome 350 pounds of stationary wire.
U.S. Pat. No. 2,620,997 and U.S. Pat. No. 3,390,844 disclose wire packages that can be used by an electrician to pay off wire for installation in commercial and residential buildings. The wire packages disclosed in these patents, however, do not withstand the conditions in which they may be used by an electrician in the field. These conditions may be simulated by tests that include the following steps, with each step performed ten times in succession: (a) sliding the package from side-to-side, (b) turning the package over, (c) dropping one horizontal edge of the package onto a hard surface from a height of two feet, (d) dropping the opposite horizontal edge of the package onto a hard surface from a height of two feet, and (e) dropping the opposite horizontal edge of the package onto a hard surface from a height of one foot. To pass these tests, the cable within the package should pay off without becoming tangled within the package after being subjected to these conditions at three points in time—when the package is 100% full, 50% full and 25% full.
When tested, the package disclosed in U.S. Pat. No. 2,620,997 failed these tests in each of ten attempts, and the package disclosed in U.S. Pat. No. 3,390,844 failed these tests in nine of ten attempts. The failures may be due to the packages breaking, or the cable within the packages becoming tangled such that it will not pay off correctly from the packages. Thus, there exists a need to develop a wire package that will withstand the conditions under which such packages are used by an electrician, while also overcoming the problem in the art of allowing a single electrician to pay off multiple wires at one time with less effort.
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate various embodiments of the present invention. In the drawings:
The following detailed description refers to the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the following description to refer to the same or similar elements. While embodiments of the invention may be described, modifications, adaptations, and other implementations are possible. For example, substitutions, additions, or modifications may be made to the elements illustrated in the drawings, and the methods described herein may be modified by substituting, reordering, or adding stages to the disclosed methods. Accordingly, the following detailed description does not limit the invention.
Consistent with embodiments of the invention, a cable package may be provided. The cable package may comprise a cable and a chamber. The cable may comprise a winding and at least one free end. The chamber may define an internal volume containing the cable. The chamber may comprise a continuous opening. The continuous opening may comprise at least one surface arranged to apply pressure to a portion of the cable located proximate to the continuous opening.
A portion of partition 106 may pass through continuous opening 210 and two mating surfaces may comprise the portion of partition 106 and a portion of top surface 208. For example, partition 106 may be located at least partially within chamber 200. In addition, partition 106 may divide chamber 200 into a first section and a second section. Partition 106 may be in the shape of a disk or other shapes. Partition 106 may be free to move or may be mounted in a fixed position.
First piece 102, second piece 104, and partition 106 may be manufactured from a polymer, metal, or both. First piece 102, second piece 104, and partition 106 may be manufactured via injection molding, rotational molding, vacuum forming, or stamping.
As shown in
Free end 304 may pass between partition 106 and top surface 208. In embodiments where package 100 does not comprise partition 106, continuous opening 210 may be formed by top surface 208 and inner surface 202. For example, inner surface 202 may comprise an angled portion 306. Top surface 208 and angled portion 306 may form continuous opening 210. Free end 304 may pass between top surface 208 and angled portion 306.
Continuous opening 210, whether formed by inner surface 202 and top surface 208 or top surface 208 and partition 106, may maintain a back tension on winding 302. Winding 302 may be wound tightly around inner surface 202. In other words, winding 302 may be wound around inner surface 202 such that winding 302's position or the position of the individual cables making up winding 302 do not change a significant amount during normal handling of package 100. The back tension may keep winding 302 from unwinding within chamber 200 when cable 300 is not being paid off from package 100.
Furthermore, the characteristics of the specific cable 300 to be placed in a package 100, including the cable's composition and flexibility, will help determine the amount of cable 300 is placed in a package 100 the inner diameter of the winding 302 and the height of the winding 302.
After winding cable 300 onto inner surface 202, chamber 200 may be formed around winding 302. Free end 304 may be passed through continuous opening 210. Passing free end 304 through continuous opening 210 may comprise passing free end 304 from the first section around partition 106 to the second section. Cable 300 may be paid off from package 100 by passing free end 304 through continuous opening 210.
Top surface 608 may include a curved portion 612 that may be adjacent to inner surface 602. As shown in
First piece 502 and second piece 504 may be manufactured from a polymer, metal, or both. First piece 502 and second piece 504 may be manufactured via injection molding, rotational forming, vacuum forming, thermoforming, or stamping.
As shown in
Continuous opening 610 may maintain a back pressure on winding 702. Winding 702 may be wound tightly against outer surface 606. In other words, winding 702 may be wound against outer surface 606 such that winding 702's position or the position of the individual cables making up winding 702 do not change a significant amount during normal handling of package 500. The back pressure may keep winding 702 from unwinding within chamber 600 when cable 700 is not being paid off from package 500. In other words, the back pressure created by continuous opening 610 may cause winding 702 to remain against outer surface 606 and not collapse onto inner surface 602.
Where a is half the length of the major axis, D is the diameter of package 500, and θ is the angle of the strands of winding 702 relative to the central axis 806 of package 500.
The circumference C of the ellipse may be calculated as:
C
ellipse=4αE(e) (Eqn. II)
Where E(e) is a complex elliptical integral of the second kind and e is the eccentricity of the ellipse e may be given by the formula:
Where b is D/2 (i.e., the radius.
Substituting an approximation for the infinite series that results from the complex elliptical integral of the second kind may result in the circumference of a strand of winding 702 proximate outer surface 606 that may be approximated as:
The circumference of package 500 (e.g., outer surface 606 proximate winding 702) may be:
Cpackage500=πD (Eqn. V)
Cellipse is greater than Cpackage 500 when 2b=D. Therefore, for a rigid container (i.e., package 500), the length of each revolution of wire in winding 702 may be greater than the circumference of the surface constraining each revolution of wire in winding 702 (i.e., outer surface 606). As a result, the wire in winding 702 may not lay flat on bottom surface 604. In other words, the length of each revolution of wire within winding 702 may cause the wires within winding 702 to maintain a stable position within package 500 and not collapse onto each other. The stability of winding 702 may be maintained even when winding 702 comprises a wire having a lubricated jacket (i.e., SIMpull® wire). In addition, the stability of winding 702 may be maintained during normal handling of package 500. For example, winding 702 may maintain its shape and position when package 500 slides side-to-side, turns in any direction or is dropped. Indeed the winding inside the packages disclosed herein pass the tests discussed above that simulate the conditions in which the packages may be used by an electrician in the field.
Winding 702 may be constrained on three sides. For example, winding 702 may be constrained by outer surface 606, top surface 608, and bottom surface 604. Due to cable 700 being laid at angle θ, the three sides may each apply a pressure to winding 702. The three sides may act to constrain winding 702's movement by applying a pressure that does not exceed the yield point of the packaging material. Winding 702 also may be constrained due to its lay pattern and geometry. The constraining of winding 702's movement may allow package 500 to be moved, even after portions of cable 700 have been paid off of winding 702, without winding 702 becoming tangled within package 500.
Winding 702 being constrained by bottom surface 604, outer surface 606, and top surface 608 may include winding 702 being in close proximity to bottom surface 604, outer surface 606, and top surface 608. In other words, winding 702 may be substantially close to bottom surface 604, outer surface 606, and top surface 608 such that during movement of package 500 winding 702 may retain its shape and position within chamber 600.
Winding 702 may comprise a solid or stranded cable or wire. Constraining winding 702 may provide stability. For instance, if winding 702 is a stranded wire or other wire with an increased flexibility, having winding 702 constrained may allow for portions of winding 702 to be paid off from package 500 while still allowing winding 702 to maintain its shape and resist tangling. For example, an electrician may use 50% or 75% of the wire within package 500 and due to winding 702 being constrained, the electrician may then be able to move package 500 without winding 702 becoming tangled or otherwise unusable.
The wire or cable may include a jacket that may comprise lubrication integrated into the jacket. For example, the wire or cable may be SIMPULL® wire manufactured by SOUTHWIRE® Company of Carrollton, Ga. Alternatively, the wire or cable may include a jacket that does not comprise lubrication integrated into the jacket, and, in such cases, lubrication may be integrated into the package 500.
A rigid container may be a container that maintains a cylindrical shape as the size of winding 702 decreases. In other words, a rigid container may be a container that maintains its shape and have a constant cylindrical profile as wire is paid off from the rigid container. The rigid container may also be tear and puncture resistant.
As shown in
Top surface 1008 may comprise a recessed portion 1012. Bottom surface 1004 may comprise a protrusion 1014. As shown in
First piece 902 and second piece 904 may be manufactured from a polymer, metal, or both. First piece 902 and second piece 904 may be manufactured via injection molding, rotational molding, vacuum forming, or stamping. Wire or cable may be located within chamber 1000 and pay off from package 900 as described above with respect to
Continuous opening 1010 may maintain a back pressure on winding 702. Winding 702 may be wound tightly against outer surface 1006. In other words, winding 702 may be wound against outer surface 1006 such that winding 702's position or the position of the individual cables making up winding 702 do not change a significant amount during normal handling of package 900. The back pressure may keep winding 702 from unwinding within chamber 1000 when cable 700 is not being paid off from package 900. In other words, the back pressure created by continuous opening 1010 may cause winding 702 to remain against outer surface 1006 and not completely collapse onto inner surface 1002.
As described above with respect to
Wire may feed from a first continuous opening 1118 and a second continuous opening 1120. The wire from first package 1102 may feed through a center core 1122 of second package 1104. In addition, more than two packages may be stacked. For example, an electrician may need five wires and therefore may stack five packages. Furthermore, while
First piece 1202 and second piece 1204 may form a chamber. The chamber may define an internal volume. The chamber may comprise an inner surface 1212, a bottom surface 1214, an outer surface 1216, and a top surface 1218. Top surface 1218 and inner surface 1212 may form a continuous opening, such as continuous opening 1010 shown in
Top surface 1218 may comprise a plurality of recessed portions 1220. Bottom surface 1214 may comprise a plurality of protrusions 1222. Plurality of recessed portions 1220 may be discrete in size. Plurality of protrusions 1222 may comprise discrete protrusions.
First piece 1202 and second piece 1204 may be manufactured from a polymer, metal, or both. First piece 1202 and second piece 1204 may be manufactured via injection molding, rotational molding, vacuum forming, thermoforming, or stamping. Wire or cable may be located within the chamber and pay off from package 1200 as described above with respect to
The continuous opening may maintain a back pressure on winding 702. Winding 702 may be wound tightly against outer surface 1216. In other words, winding 702 may be wound against outer surface 1216 such that winding 702's position or the position of the individual cables making up winding 702 do not change a significant amount during normal handling of package 1200. The back pressure may keep winding 702 from unwinding within the chamber when cable 700 is not being paid off from package 1200. In other words, the back pressure created by the continuous opening may cause winding 702 to remain against outer surface 1216 and not completely collapse onto inner surface 1212.
First piece 1202 and second piece 1204 may be connected with a hinge 1224. Hinge 1224 may allow first piece 1202 and second piece 1204 to open so a replacement winding may inserted into package 1200. In other words, hinge 1224 may allow package 1200 to be reusable by an end user. Alternatively, first piece 1202 and second piece 1204 may be connected using twist locks, snaps, pins, rivets, heat bonding, thermal bonding or some similar mechanism or technique. Any of these types of connections also may allow first piece 1202 and second piece 1204 to open so a replacement winding may be inserted into package 1200.
The various packages may be manufactured from various materials and may be of varying thicknesses. For example, the material thickness may range from 30 mils to 60 mils. The material may be, for example, a PVC, polyethylene, or any polymer having a high molecular weight. The combination of material and material thickness may be dependent on the operating environment. For example, in a cold climate, a material with a high molecular weight may be used to help combat brittleness. In a warm climate, a thicker material with a lower molecular weight may be used. In addition the material may be clear or semi-transparent to allow a user to see and/or determine how much wire is remaining in the package.
Handle 1300 may be part of or attached to first piece 1202 of package 1200, second piece 1204 of package 1200, or both. To facilitate attaching handle 1300 to a package, first side 1302 may include a first prong 1310. Second side 1304 may include a second prong 1312 and a third prong 1314. The prongs may engage indentions located on the package. In addition, the prongs may include a tacky substance (e.g., an adhesive or grip tape) to facilitate securing handle 1300 to the package.
Handle 1300 may be manufactured by injection molding, rotational molding, thermoforming, or other manufacturing techniques. Once handle 1300 is formed, any tacky substance used to facilitate securing handle 1300 to the package may be applied. In addition, during manufacturing grooves may be formed in first prong 1310, second prong 1312, and third prong 1314.
Consistent with embodiments of the invention, a method of manufacturing a cable package may be provided. The cable package may comprise a cable and a chamber. The chamber may be formed by connecting a first piece and a second piece. The first piece and second piece may be manufactured via injection molding, rotational molding, vacuum forming, or stamping.
A cable may be wound into a winding, and the cable may have a free end. The winding may be wound around a reel at an angle θ relative to an axis perpendicular to a central axis of the reel. During installation, the reel may rotate about a central axis. A cable may feed from a head. The head may oscillate along parallel to the central axis, and the oscillation of the head may cause a cable to lay on the reel at angle θ. Angle θ may range from approximately 2 degrees to approximately 85 degrees. Angle θ may be a function of a cable's gauge and flexibility. In addition, angle θ may be a function of the curvature of the reel. As a cable winds around the reel, instead of forming a circle around the reel, a cable may form one or more ellipses around the reel. Furthermore, as discussed in embodiments above, a cable may buildup in both the z and r directions simultaneously to form a winding.
A winding formed on a reel may then be removed from the reel and placed onto the second piece of a package. Alternatively, the winding may be formed directly onto an inner surface of the second piece using the steps discussed above.
Once a winding is in place, the first piece and the second piece may be connected together to form a chamber. The first piece and the second piece may be connected with a hinge, twist locks, snaps, pins, rivets, heat bonding, thermal bonding or some similar mechanism or technique. The connection between a first piece and a second piece may be arranged to allow a first piece and a second piece to open so a replacement winding may be inserted into a package.
The connection of a first piece and a second piece may be arranged to form a continuous opening between a first piece and a second piece, and a free end of a cable may pass through the continuous opening.
A handle may be manufactured as part a first piece of a package, a second piece of a package or both. Alternatively, a handle may be attached to a first piece of a package, a second piece of a package or both. A handle may be manufactured by injection molding, rotational molding, thermoforming, or other manufacturing techniques.
While certain embodiments of the invention have been described, other embodiments may exist. While the specification includes examples, the invention's scope is indicated by the following claims. Furthermore, while the specification has been described in language specific to structural features and/or methodological acts, the claims are not limited to the features or acts described above. Rather, the specific features and acts described above are disclosed as examples for embodiments of the invention.
The current application claims the benefit of U.S. Provisional Patent Application No. 61/725,227, entitled “WIRE PACKAGE,” filed on Nov. 12, 2012; and U.S. Provisional Patent Application No. 61/776,323, entitled “WIRE PACKAGE,” filed on Mar. 11, 2013, both of which are hereby incorporated by reference in their entirety.
Number | Date | Country | |
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61725227 | Nov 2012 | US | |
61776323 | Mar 2013 | US |