The embodiments described herein relate to insulators and clamps for electrical utility lines. The clamping insulators of the present embodiments integrate an improved clamp to secure the wires to the insulators, as well as features to provide greater bearing force on the wire and to provide easier installation and removal of insulators.
An electrical insulator acts as a barrier between the electricity flowing in a charged electrical utility line and the ground. For brevity, the term “electrical wire” or, for brevity, “wire” (including plural forms), is used herein to encompass various conduits through which electricity passes including wires, cables, and utility lines.
Conventionally, wires are attached to and supported by poles, towers, and other support structures by both an insulator and a clamping arrangement to secure the live line to the insulator. Typically, the clamping arrangement includes an insulator and a clamping device comprising a body member on which the line is placed and a clamping arm which is seated over the line and bolted to the body member using bolts, nuts, and washers. In other conventional examples, the electrical wire is secured to the insulator by the use of a vice-like arrangement that presses against the wire from the left and right side by tightening the nuts and bolts.
Electrical utility workers, or linemen, are generally not allowed to touch the insulator through which a charged wire passes. Instead, the lineman are required to utilize an insulated pole known as a “hot stick” or “switch stick” to protect them from electric shock and to provide physical separation from the insulator to reduce the chances of burns. Hot sticks are usually made of fiberglass and are made in variety of lengths, from a few feet up to forty feet in length. However, most hot sticks are typically six to ten feet in length.
While insulated hot sticks provide safe contact with energized equipment, their use presents a number of disadvantages in installing, tightening, removing, and loosening the typical conductor from an insulator. This operation requires the lineman to meticulously manipulate the hot stick in order to tighten or loosen the nuts and bolts of the typical clamping arrangement. Typically, said bolt is positioned parallel to the ground which makes it difficult to access the eyelet or bolt with a hot stick. This extensive and meticulous operation presents obvious safety hazards to the lineman and results in an inefficient and time consuming process for most electrical line crews.
The conventional electrical power line clamp presents other disadvantages. This includes the opportunity for parts, such as nuts and bolts, to be dropped during the installation or removal process. Rather than carrying a clamping apparatus that also serves as an insulator, the conventional arrangement also requires linemen to carry separate insulators and clamps for the installation and removal process. Moreover, because conventional electrical clamps are not universally adapted to secure electrical wires of various diameters, linemen are often required to carry a variety of clamp sizes for securing electrical wires of different sizes.
Some conventional clamping arrangements utilize a clamping device comprising a body member on which the line is placed and a clamping arm. The clamping arm is then seated over the line and bolted to the body member so they are hingebly connected. When the electrical wire is secured to the clamp in this typical arrangement, the electric wire runs parallel to the axis of the hinge that secures the clamping arm to the body member and also runs perpendicular to the clamping arm itself. Furthermore, when the electrical wire is secured to the clamp in the conventional arrangement, the electrical wire is equidistant from the axis of the hinge and the end of the clamping arm in the closed position such that a “symmetrical fulcrum” effect is utilized to secure the wire. However, in this conventional arrangement the symmetrical fulcrum effect and the parallel relationship between the electrical wire and the axis of the hinge do not provide a sufficient bearing force directly on the electrical wire to secure it in place. Herein, the term “axis” refer to an imaginary line about which rotation occurs (e.g., hinge axis 50) or the term axis can be a reference line used in defining one or more angles (examples include fixture axis 72 and longitudinal axis 78, described below).
Accordingly, there is a significant need for a clamping insulator that provides greater bearing force directly on the wire and can be easily manipulated using a hot stick. Such an improvement would further reduce certain hazards to linemen and limit the time required for installation and removal of the insulator. There is a need for an integrated insulator and clamp suitable for a variety of electrical wire diameters. Likewise, it is desirable for an insulated clamp to utilize an eyebolt, or a similar type of attachment, instead of nuts and bolts for securing the wire to the insulator. Along with other features and advantages outlined herein, clamping insulators within the scope of present embodiments meet these and other needs. In doing so, the inventive apparatuses provide greater bearing force directly on the wire, easier installation and removal of the insulator. Moreover, the use of an eyebolt or a similar type of attachment for securing the clamp in the closed position allows a lineman to easily manipulate the insulated clamp by the use of a hot stick, and a clamping apparatus with insulator adapted for accommodating a variety of wire diameters.
A clamping insulator, sometimes referred to herein as “clamping apparatus” or “clamp” for brevity, according to present embodiments provides greater direct bearing force directly to the wire, with easier installation and removal. Structurally, the clamps of the present embodiments comprise a fixture for holding specific parts in certain positions during engagement with a wire, i.e., for securing a first clamp member in a position relative to a second clamp member as selectably chosen by a user. The present embodiments allow for easier and safer manipulation of the inventive clamping apparatus, such as by a lineman using a hot stick, with the clamp able to self-adjust to secure a variety of wire sizes.
For illustrative (and non-limiting) purposes, the present embodiments are described with an eyebolt for the fixture, to secure the clamp members in position relative to one another. However, any number of other fixtures besides eyebolts are well known to persons of ordinary skill in the art, which can be used easily with the inventive clamp for securing the positioning of the clamp members when the apparatus is in the closed position. Accordingly, references to an eyebolt or an eyelet are not intended as limiting of the scope of embodiments.
Current embodiments provide for a clamping insulator with a first clamp member that can be either opened or closed relative to the second clamp member. In this way, the first clamp member is connected to the second clamp member in a hinged relationship, i.e., hingebly. This hinge provides a single axis of rotation for the first clamp member relative to the second clamp member. In this embodiment, the hinge allows the first clamp member to simply be flipped or folded over upon the lower member to a closed state in order to secure the electrical wire in place. The first and second clamp members form a channel through which the electrical wire passes through. As will be explained in more detail below, in some embodiments the channel contains a series of grooves which are indentations in the channel surface for receiving at least one insert (shown in non-limiting fashion as a plurality of inserts in the figures). The inserts are formed from known materials that can be used to provide different holding and retention effects directly upon the electrical wire by increasing the friction between the wire and the clamp. Examples of such materials include ceramics, polymers, semi-metallic, or metallic.
In some embodiments, an eyebolt is utilized as the fixture, which both secures the first and second clamp members together and allows a lineman to manipulate the clamp without manual contact. The eyebolt is hingebly connected to the first clamp member of the clamp, such that the eyebolt swivels upon the axis of this eyebolt hinge when the first clamp member is closed or opened. When the clamp is manipulated from the open position to the closed position by the use of a hot stick, the eyebolt engages a fixture receiving notch formed in the second clamp member.
In addition, when the clamp is manipulated from the open position to the closed position, the clamp self-adjusts to secure electrical wires of different diameters. In some embodiments, a lineman can choose to tighten the insulated clamp about the electrical wire based on the application and/or vary the clamping force by accessing the eyelet of the eyebolt with a hot stick, and rotating the eyebolt to tighten the clamp shut. In other embodiments, the eyebolt automatically locks in place, without additional tightening with a hot stick, by merely being folded into the closed position.
In some embodiments, the first and second clamp members are arranged with corresponding angled regions such that when the first clamp member is in the closed position and the eyebolt is automatically secured in place, the eyebolt is positioned at an angle (e.g., including but not limited to 30° in some embodiments) relative to the support structure on which the wire sits, making it easier for the lineman to access the eyelet with the hot stick. When the first clamp member is in the open position and the eyebolt is not secured in placed to the lower member, the eyebolt is also positioned away from the support structure making it easier for the lineman to flip the clamp closed.
The fixture axis rests in a compound angle that also allows orientation relative the ground. This creates easier installation for the lineman by allowing hot stick access from below the plane of the electrically charged wires. Existing vise type products position the eyebolt parallel to the ground requiring difficult access for installation unless the lineman positions themselves dangerously close to the adjacent electrically charged wires.
In conventional insulators that position a wire relative to a utility pole or support structure, the electrical wire runs parallel to the axis of the hinge of the clamping arm, perpendicular to the clamping arm itself, and/or perpendicular to the body member on which the electrical line is placed. Further, in conventional insulators with clamping arms, the electrical line is placed equidistant between the axis of the hinge and the end of a clamping arm when in the closed position, such that the clamping arm creates a symmetrical fulcrum. However, this typical clamping arrangement fails to provide a sufficient bearing force directly on the electrical wire to secure it in place.
According to present embodiments, the electrical wire is placed at an angle relative to the axis of the hinge rather than running parallel. In addition, the wire is not equidistant between the axis of the hinge and the end of the first clamp member when in the closed position. Rather, in these embodiments, the electrical wire is secured in place closer to the hinge point than the point equidistant the hinge axis and the end of the first clamp member when in the closed position. These embodiments create a mechanical force marked by an “asymmetrical fulcrum” effect in which more surface area of the clamp is applied to the wire. As compared to other conventional insulators, the asymmetrical fulcrum effect of the present embodiments results in more pressure directly on the wire to secure it in place (e.g. 1.3 times).
The drawings and embodiments described herein are illustrative of multiple alternative structures, aspects, and features of the present embodiments, and they are not to be understood as limiting the scope of present embodiments. It will be further understood that the drawing figures described and provided herein are not to scale, and that the embodiments are not limited to the precise arrangements and instrumentalities shown.
It will be appreciated that in some embodiments first clamp member 18 rotates about hinge 45 relative to second clamp member 28. For example, external rotation is denoted by arrow 17 shown in
Embodiments shown in
As shown in later figures, when first clamp member 18 engages second clamp member 28, first clamp member 18 and second clamp member 28 define hinge hole 48 to receive hinge 45. Protrusion 20 and recess 30 define a series of grooves 40 to receive inserts 42. Optionally, at least one insert 42 is positioned on a surface of protrusion 20 to provide this friction effect. In the illustrated embodiment, inserts 42 are corrugated. However, inserts of different texture and material may be used to provide a variety of retention forces, as needed, directly upon the electrical wire.
As will be illustrated in later figures, eyebolt 52 and eyebolt sleeve 65 are connected to clamp 15. Eyebolt 52 includes eyelet 55 to receive a hot stick which can be manipulated to secure an electrical wire in place to insulated clamp 5. Eyebolt 52 also consists of threaded screw 58, and nut 60 and washer 62 that are located on the distal end of eyebolt 52 between threaded screw 58 and eyelet 55. Eyebolt sleeve 65 includes eyebolt sleeve hole 68 to receive eyebolt 52, and in some embodiments sleeve 65 fits securely within a first fixture receiving notch 34 of first clamp member 18 as discussed below. As shown in
Also, a second angled region 32 of second clamp member 28 is where a second fixture receiving notch 35 is positioned to receive the eyebolt with the clamp in an internally rotated position resulting in clamp closure to a degree selected by a user of the clamp, i.e., sufficient to exert a force upon the wire as protrusion 20 contacts the wire. Accordingly, the idea of clamp closure is a relative term, the degree of which may vary based on several factors including the diameter and size of the wire, but which in operation is marked by contact between the protrusion of the first clamp member and the wire. In general, however, clamp opening occurs when the distance between the first angled region and the second angled region (described below) becomes greater, while clamp closure occurs when this distance becomes smaller to the point where protrusion 20 contacts the wire.
To close clamping insulator 5, a lineman would use a hot stick to simply flip or fold first clamp member 18 upon second clamp member 28, without having to removing eyebolt 52, to secure an electrical wire in place. Upon closure of first clamp member 18 upon second clamp member 28, closing clamping insulator 5, and the internal rotation associated with closure causes eyebolt 52 to engage second fixture receiving notch 35 of second clamp member 28.
It will be understood that hollow region 12 of insulator 10 is not limited to the precise arrangement and scale shown in
As shown in various figures, including without limitation
As illustrated in
Referring now to
In certain embodiments as shown in
Referring now to
In operation, clamping insulator 5 shall be pre-assembled. A lineman will then attach clamping insulator 5 to support structure 80 with hollow region 12 fitted over the support structure. A lineman will then use a hotstick to open clamping insulator 5 and rest electrical wire 74 onto recess 30 of second clamp member 28. To close the clamping insulator, a lineman would simply flip or fold first clamp member 18 over upon second clamp member 28, without removing eyebolt 52, in order to secure electrical wire 74 in place. A lineman would then access eyelet 55 with a hot stick and rotate eyebolt 52 until first clamp member 18 and second clamp member 28 fully secure electrical wire 74.
It will be understood that the embodiments described herein are not limited in their application to the details of the teachings and descriptions set forth, or as illustrated in the accompanying figures. Rather, it will be understood that the present embodiments and alternatives, as described and claimed herein, are capable of being practiced or carried out in various ways.
Also, it is to be understood that words and phrases used herein are for the purpose of description and should not be regarded as limiting. The use herein of “including,” “comprising,” “e.g.,” “containing,” or “having” and variations of those words is meant to encompass the items listed thereafter, and equivalents of those, as well as additional items.
Accordingly, the foregoing descriptions of several embodiments and alternatives are meant to illustrate, rather than to serve as limits on the scope of what has been disclosed herein. The descriptions herein are not intended to be exhaustive, nor are they meant to limit the understanding of the embodiments to the precise forms disclosed. It will be understood by those having ordinary skill in the art that modifications and variations of these embodiments are reasonably possible in light of the above teachings and descriptions.
This continuation patent application claims the benefit of and priority to U.S. Pat. No. 10,134,509, which issued on Nov. 20, 2018, the contents of which are fully incorporated herein by reference in its entirety and is claimed as a basis for priority.
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Number | Date | Country | |
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Number | Date | Country | |
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Parent | 15664672 | Jul 2017 | US |
Child | 16182892 | US |