Spiral tension clamp

IPC classes for russian patent Spiral tension clamp (RU 2521438):

H02G7/02 - Devices for adjusting or maintaining mechanical tension, e.g. take-up device

Another patents in same IPC classes:

Phase electric wire of overhead power transmission line and method of wiring of this phase electric wire of overhead power transmission line / 2461936

Phase electric wire contains a core with at least one composite strand and multi-strand layer and is routed in this line on overhead power transmission line providing technologic and maintenance undamageability of the electric wires due to complex developed process equipment and use of individual length for wiring, the length is equal to complete anchor factory length of the line or its mounting section, thus excluding additional losses of transmitted electric power in electric wires joints which number is minimal.

High-voltage overhead power transmission line and method of erection of high-voltage overhead power transmission line / 2461935

Power transmission line includes mounted on foundation tower supports with traverses, insulators, terminal and trunnion-type clamps nondamaging housing and structure of high-temperature composite electric wires fixed in them, each of wires contains a core with at least one composite strand and multi-strand layer. Overhead transmission line is mounted by the method providing technologic and maintenance undamageability of the electric wires due to complex developed process equipment and use of individual length for electric wires line routing, the length is equal to complete anchor factory length of the line or its mounting section, thus excluding additional losses of transmitted electric power in electric wires joints which number is minimal.

Tension wedge clamp / 2435265

Tension wedge clamp for fixation of wires (ropes) 1 of air power transmission lines comprises a body 2, covers 3, wedges 4, 5, traction rods 6 and a helical protector 10. The external and internal surfaces of the protector 10 are processed with an abrasive and glue along their whole length or only in the area of wedges 4, 5 location. Besides, the abrasive with glue may also be applied onto surfaces of the wedges 4, 5 or only onto the inner surface of the protector 10 and simultaneously onto surfaces of the wedges 4, 5. Wire spirals of the protector 10 have opposite direction of winding relative to winding direction of external winding of wires in a wire (a rope) 1. The length of the protector 10 makes (1.0÷15.0) of the selected length of the clamp body 2, diameter of the wires in spiral strands of the protector 10 equals (0.6÷3.0) of the diameter of wires in the external winding of the wire (rope) 1, and pitch of the spiral strands in the protector 10 is selected as equal to (0.1÷5.0) from the value of the wire (rope) 1 wires twisting pitch 1.

Method to manufacture helical clamps with protector / 2417496

Wire spirals of the protector are wound in a pre-forming machine, twisted into a strand, fixed relative to each other in the produced strand with the soft wire, and glue with abrasive is applied onto inner and outer surfaces of the strand. Thicknesses of glue and abrasive layer applied at both sides of the protector strand are selected within the range of (0.15÷6.0). To make power strands, selected wires are joined into a bundle, the central part of the bundle wires are twisted with each other, and end sections of the bundle are formed into power strands of wire spirals, thus leaving inner and outer surfaces of the power strands without glue with abrasive; direction of the protector wire spirals winding is opposite to direction of the power strand wire spirals winding.

Overhead power transmission line / 2405234

Anchorage section of proposed overhead power transmission line comprises two dead-end structure and tension section of the conductor with its ends connected to first and second said dead-end structures and including two sequential subsections. Note here that at least one first subsection incorporates at least one composite or invar core. First subsection of tension section features coefficient of thermal expansion and density other than those of second subsection. Composite core comprises at least one of aluminium-based composites or aluminium-alloy matrix. Composite core comprises composite with polymer matrix. Tension section comprises at least one additional subsection with composite core. Tension section comprises at least three intermediate tower supports mounted between first and second dead-end structures.

Anchor bracket / 2391758

Bracket is formed as rod staple (1) of triangular or other shape, having eye (3) at one end, to which anchor clamp is fixed with wire or cable, and on the other end there are shoulders (4) arranged, directed towards each other with gap (5). Bracket is provided with pressing plate arranged with recesses along longitudinal axis of symmetry and oval hole. With recesses shoulders (4) of plate are put onto bracket (1), and several turns of mounting tape of stainless steel are wound on top, and with its help the bracket is fixed to line supports. Strength of bracket design is provided by optimal selection of according geometric dimensions of bracket (1) and plate (2).

Anchor bracket (versions) / 2389115

First version of bracket design is arranged in the form of profiled body made of various material and having base (1), central part (2) that rests on base (1), and two side surfaces (3, 4); body profile ends with two tongues (5, 6) arranged at the angle α=0÷30° to each other. Bracket is fixed to anchor clamp through tongues by means of bolt (8) with hexahedral head (9), nut (10) and splint (11), it is also fixed to base (1) by means of strip clamps arranged in slots-cavities of body - to line support. In order to eliminate various movements of strip clamps or nut (10), limiters (13) are added. The second version of design represents a body of "П"-shaped profile, on horizontal shelf of which there are yokes of metal belt arranged, and a finger is fixed in its vertical holes for connection to anchor clamp.

Device to anchor and intermediate fastening of overhead power line independent isolated wires / 2379809

Invention relates to electrical engineering, particularly to overhead power line isolated wire fastening. Proposed device comprises casing (1), base (2) and one single-finger clevis (3) with hole to fasten anchor or support clamp. Casing (1) represents equilateral triangle with sides (5, 6) and base-plate (7) with slots (10 ,11) that have holes. Width 1 of every slot (10, 11) exceeds size S between faces of fastening bolt head, while distance A between extreme holes of plate 7 is determined from relationship A=(4.0 to 5.0)·d_bolt, where d_bolt is the fastening bolt diametre. Note that width I of slots (10,11) is I=S+(1.0 to 1.3) mm, where S is the distance between bolt hexagonal head faces. Note that distance L between casing lateral sides is L=(0.55 to 0.72)·A, casing height H is H=(1.0 to 1.2)·L, and casing lateral sides are made along radius R with its center located on the plane of plate 7 and calculated from relationship covered by this invention.

Wedge strain clamp / 2368049

Invention relates to electrical power engineering, more specifically to wedge strain clamps for fastening cables or overhead transmission lines. The clamp has side plates (1, 2), journals (3), covers (4, 5), top and bottom wedges (6, 7) and devices (11, 12) for pre-tightening the wedges (6, 7). Rods (13, 14) are attached to journals (3), and the latter join the clamp through a pin (17) to elements of the insulator set of the line. On plates (1, 2) there are rectangular projections (18), and on covers (4, 5) there are reciprocating open grooves (22). When assembling the clamp, projections (18) enter grooves (22), forming a one-piece casing (23) for the clamp. Wedges (6, 7) are made with segment channels (8, 9) under the cable (line) (10) installation. To increase adhesion of wedges (6, 7) to surfaces of the cable (line) radial cuts (25) are made on the channels, lying across longitudinal axes (26) of the cables (lines) (10) and at height h=(0.4-0.8) mm, apex angle α₁=(55°-65°) and spacing 1=(1.1-1.6)·h. There is a rectangular cavity (27) on the top wedge (6), in which are fixed support bar (29) and U-bolt (31) of the first device (11) for pre-tightening the wedges (6, 7). On the bottom elongated and bent wedge (7) there are annular cavities (33, 34). U-bolt (35) and billet (36) of the second device (12) for pre-tightening wedges (6, 7) are fixed in cavity (34).

Tension clamp / 2360344

Invention refers to electrical power engineering, namely to tension clamps by means of which wires are attached to angle-tension towers of overhead transmission lines. Clamp consists of housing 2 with chute 3, hold-down strap 4, tightening bolts 5, 6 with nuts 29, and lug 7 with pin 8. Housing 2 and strap 4 have eyes 9, 10, 11 and 12 which are offset relative to axis 13 of straight-line section 14 of chute 3 of housing 2 and located relative to each other at the distance H₁=(0.25÷0.7)·H, where H - length of straight-line section 14 of chute 3 of housing 2, which is calculated depending on maximum wire diametre d_wire.max as per the following ratio: H=(4.7÷8.0)-d_wire.max. Curvature radius R of chute 3 of housing 2 is equal to curvature radius R₁ of chute 15 of strap 4. Holes 16, 17 of eyes 11, 12 of strap 4 are provided with cavities for heads 20, 21 of bolts 5, 6, and hole 16 has through slot 22. Holes 23, 24 of eyes 9, 10 of housing 2 of oval shape and their centres 25, 26 of radii are located from each other at distance a equal to (0.25÷0.3)d_bolt, where d_bolt - tightening bolt diametre. Hole 23 of eye 9 is provided with wall 28 inclined relative to vertical 27.

/ 2272346

/ 2280303

/ 2291535

/ 2315408

/ 2315409

/ 2317621

Clamp for attaching load-carrying element of optical cable of 8 type / 2360343

Invention refers to electrical power engineering, namely to tension (connection) clamps for attaching a load-carrying element of optical cable of 8 and reverse 8 type ("8"). Clamp consists of connection element (2) and clamp member in the form of round compression sleeve (3) with casing (4) put thereon. In end hole (5) of sleeve (3) there introduced is elastomeric ring (6) the end whereof is provided with flexible diaphragm and on internal surface whereof there are shaped protrusions (7) of variable height from maximum at ring (6) inlet to minimum at the outlet, which deflect when load-carrying member (1) of optical cable is introduced (some part of which is introduced without insulation), thus providing clamp tightness. At that, it is necessary that diametre d of load-carrying member (1) with insulation is equal to inner diametre D of elastomeric ring (6). Connection element (2) of the clamp is designed as per one of the types of standard line accessories. The proposed clamp is used on air lines 0.4 kV with self-bearing insulated wires.

Tension clamp / 2360344

Wedge strain clamp / 2368049

Device to anchor and intermediate fastening of overhead power line independent isolated wires / 2379809

FIELD: electricity.

SUBSTANCE: invention is related to electric engineering, and namely to spiral tension clamps intended for fixation of wires and cables of overhead transmission lines. The spiral tension clamp is made as spirals wound into a strand and consisting of at least two branched wound onto the wire or cable and forming in the middle part a U-shaped loop with an eye inserted into it and fixed through connecting elements to the line support equipped with a protector made as coiled wires or ribbon coils and mounted at the U-shaped loop side at a section of the wire or cable free from wound strands.

EFFECT: invention ensures reliable fixture of wires and cables to overhead transmission lines and excludes damage of wires and cables of the overhead transmission line within the whole period of its operation at minimum complication of the clamp manufacturing technology, increase of material consumption and labour costs for its installation.

3 cl, 2 dwg

The present invention relates to the field of electric power industry, namely the helical tension clamps to hold the wires and cables of overhead power lines.

Known helical tension clamp for anchoring wires of overhead power lines or cables, air lines, containing wound or wire, or cable, or protector, mounted on a wire or cable, U-shaped strand of wire helices, consisting of two branches, and one end of the mounting ending loop, which is nested the eye; the clip has an additional U-shaped strand of wire spirals with opposite direction of winding [Description to the patent of Russian Federation №2291535 "Spiral tension clamp", H02G 7/02, declared 12.10.2005, published 10.01.2007,].

Known also similar in design straining clamp, consisting of two power strands with opposite directions of winding, which can be mounted directly on the wire or cable and mounted on the wire or cable protector [Description to the patent of Russian Federation №2315408 "Spiral tension clamp", H02G 7/02, declared 30.08.2006, published 20.01.2008,].

These clamps are designed primarily for operation at very high loads (tens of tons), so in addition to the two power locks in their composition may include tread, and manual is, having a length greater than the length of the power locks and intended to achieve the specified strength of the seal and to prevent damage to the wire under the action of intense compressive loads. At the same time, due to the presence of two power strands with opposite directions of winding is not typical for spiral reinforcement phenomena: changing the magnitude of tensile load during operation is twist the wires together with the clamp along the longitudinal axis of the wire. The specified rotation can cause abrasion and deformation of the wires of the upper Posiva wires in places irregular contact of the wire with a U-shaped strand of wire spirals on the hinge side with Deadeye. Unfortunately, the design of the clamps are relatively complex and expensive; requires installers particular skill when installing clamps on the wire.

The closest technical solution with respect to the invention is a helical tension clamp for securing wires and cables overhead power lines, made in the form of helices, twisted to form a strand, comprising at least two branches, nauywaima on the wire or cable, and forming in the middle part of the strands of the U-shaped loop with invested in it, Deadeye, attached via connecting elements to the support of air line [Description to Pat the NTU of the Russian Federation No. 2272346 "Spiral tension clamp", H02G 7/02, declared 29.07.2004, published 20.03.2006,].

This clip has a simple and robust design, however, does not solve the problem of damage of the wire or cable wires U-shaped loop clamp that if we change the value of tensile load begin (clip elasticity as if winded and leaves the wire) irregularly to touch and move on the surface of the unprotected area of the wire in contact with them branches of power strands and damage the wire up to a possible failure of individual wires.

The technical result of patentable solution lies in the exclusion of local damage to the wire or cable overhead power transmission lines under the clamp during the entire period of operation with minimum complication of the manufacture of the clamp and the increase in its consumption of materials and labor during installation. The claimed technical result is achieved due to the structure of spiral tension clamp: "spiral tension clamp for securing wires and cables overhead power lines on poles line, made in the form of helices, twisted to form a strand, comprising at least two branches, nauywaima on the wire or cable, and forming in the middle part of the strands of the U-shaped loop with invested in it, Deadeye, attached through the connecting elements of copora line, he is further provided with a protector, made in the form of wire spirals, in the form of a tape spirals or multiple strands of the cable and mounted on the open wound from the branches of the loop section of the wire or cable under a U-shaped loop, close to the wound branches of the loop". Spiral protector, wire, tape or strand spirals (e.g., a wire helix collected in strands with adhesive or heat-shrink tubing) avivausa on the part of the wire under the U-shaped loop close to the wound branches of the loop. During the operation of changing the magnitude of the tensile load is, as mentioned previously, the rotation of the wire clamp, and a small displacement of the strands of the clamp relative to the wire at the point of contact between the branches of power strands with wire, but twisted to form a strand of the helix clamp on the site where the advances are in contact with the surface of the wire, and with the spiral protector that protects the wires. Since the length of the protected area of the wire is very small (the part of the wire under the U-shaped loop with Deadeye), and the shape of the protector is the simplest, consumption of materials and labor for the production of the clip increases slightly; the mounting clamp is not complicated.

The protector clamp has a relatively small length, so to avoid samorost the high offset tread on the wire with a strong initial bend coming out of the wire, as well as fluctuations in the wire under the influence of wind, "the protector of its end facing the flight line, comes under the section of the strand tension clamp on which they are wound upon the wire or cable, length up to 2 steps of the spirals of the protector, so that the ends of the spirals of the protector are securely clamped between the wire and the branches of the U-shaped loop.

Reliability clutch protector with wire, obviously, the more friction between them, which is achieved by the fact that the inner surface of the spirals of the tread is covered with a layer of glue or a glue layer with abrasive".

Run the wire spirals protector "from steel wire with a protective corrosion-resistant coating, or aluminum wire, or a wire made of corrosion-resistant alloy or of a plastic polymer material, and tape spirals of metal corrosion-resistant or polymeric tape allows you to increase the service life of the clip, excluding atmospheric corrosion. However, regardless of material and shape (single wire helix, strand spirals, ribbons) execution of the protector, the protector performs its functions, except for a local damage to the wires at the output of the tension clamp and extending the life of the clamp. The choice of material and shape of the tread elements is determined on the basis of tacticskarzai operation of the clamp with the goal of ensuring maximum strength (resistance to abrasion) of the tread elements at the minimum value.

The direction of winding of the spiral protector, which coincides with the direction of winding wires of the upper Posiva wire or rope or opposite to the direction of winding wires of the upper Posiva wire or cable" due to the structure of the wire or cable (material wires of the upper Posiva), the magnitude of perceived stress, the direction of winding twisted to form a strand helices, forming a U-shaped loop.

The invention is illustrated by drawings, where figure 1 shows a General view of the set of helical tension clamp made according to the present invention; figure 2 - General view mounted on the wire clamp.

The inventive helical tension clamp (figure 1), designed for fastening wires and cables overhead power lines, consists of a retinue of spiral strands having two branches 1 and 2 with a U-shaped loop 3 in the middle part, in which is embedded the eye 4. The clamping structure includes the protector 5, made in the form of a separate wire helices, strands of wire spirals or in the form of a ribbon spirals. The direction of winding of the coils of the protector 5 may coincide with the direction of winding of the upper Posiva wires wire (cable), on which it is installed, or to be opposite to the direction of winding wires wire (cable). PROTEK is a PR 5 is in the form of wire coils, made of steel wire with a protective corrosion-resistant coating, or a wire made of corrosion-resistant alloy, for example, aluminum alloy, or from a plastic polymer material, and tape spiral protector 5 can be made of corrosion-resistant metal or polymer tape. On the inner surface of the strands of wire spirals or tape spirals protector 5 can be applied to the adhesive layer with the abrasive.

There are two variants of the clamp Assembly.

In the first case, the wire 6 first avivausa branches 1 and 2 strands of the clamp, the U-shaped loop 3 which invested the eye 4, and then, on the part of the wire under the loop coils close to the wound branches strands clamp protector 5. The eye is joined with fittings, wire given load. With increasing tensile load (the clip is installed on the unloaded wire) the elastic part of the hinge attached Deadeye coming to the end of the tread, mounted wire or ribbon spirals. Further, during operation, when the magnitude of tensile load result in small shifts of the loop 3 of the clamp relative to the wire 6, but twisted to form a strand of the helix clamp on the site where the advances are in contact with the surface of the wire, and with the spiral protector that provides safe is th wire. The presence of abrasive on the inner surface of the spiral protector 5 increases its adhesion to the surface of the wire 6 and guarantees the absence of movement of the tread 5 of the wire 6. The execution of the spirals of the tread 5 of corrosion-resistant materials ensures durability of the clip to weathering and increases its service life.

In the second case, the wire 6 is initially mounted protector 5 based that part of it will be under the branches of the clip, then mounted the branches 1 and 2 strands clamp, loop 3 which invested the eye 4, the branches 1, 2 start navigates on the edge of the tread 5 with the transition to the wire 6. In this embodiment provides a more secure mounting of the protector 5 wire 6 even in the absence of the adhesive layer with the abrasive on the inner surface of the spirals of the tread 5. The work clamp is not different from that as described in the previous version.

The inventive helical tension clamp has the advantage that it does not detrimentally impact on the wire or cable overhead power transmission lines: wire U-shaped loop locks the clamp to the extent that the tensile load is not in contact with the wire (cable) and, therefore, not hurt them. The clamp of simple construction, has a minimum overall dimensions and low weight, and relatively what about the cheap.

1. A helical tension clamp for securing wires and cables overhead power lines on poles line, made in the form of helices, twisted to form a strand, comprising at least two branches, nauywaima on the wire or cable, and forming in the middle part of the strands of the U-shaped loop with invested in it, Deadeye, attached via connecting elements to the support line, characterized in that it is equipped with a protector, made in the form of a separate wire spirals or multiple strands of spirals made of steel wire with a protective corrosion-resistant coating or wire, aluminum alloy, or from a wire made of corrosion-resistant alloy, or from a plastic polymer material, or in the form of a tape spirals made of metal aluminum or corrosion-resistant tape or plastic tape, and the protector is mounted on the open wound from the branches of the loop section of the wire or cable under a U-shaped loop close to the wound branches of the spiral and has a direction of winding, matching or opposite to the direction of winding wires of the upper Posiva wire.

2. The clamp according to claim 1, characterized in that the protector with its end facing the flight line, comes under the section of the strand tension clamp on which they are wound upon the wire or tro is for up to 2 steps spirals tread.

3. The clamp according to claim 1 or 2, characterized in that on the surface of helices, strands of wire spirals or tape spirals protector applied abrasive.