Come-along for retaining overhead wires and temporary support method for overhead wire tension using it

Abstract

To provide an aerial wire drawing come-along which is installed on an aerial wire through a remote operation from a steel tower to be able to temporarily grip the aerial wire and robust without using a gondola machine or a mobile machine, and an aerial wire tension temporary support method using the same.SOLUTION: A come-along 1 comprises a gripping device 2 and an operation rod 3. The gripping device 2 grips an aerial wire G between upper and lower clamps 5 and 6 at a position away from a steel tower T on the aerial wire G, and is drawn to the steel tower T by traction means. The operation rod 3 carries out a remote operation from the steel tower T to send out the gripping device 2 through sliding on the aerial wire G to an installation position, and to temporarily grip the aerial wire G by the upper and lower clamps 5 and 6. The upper clamp 5 descends through rotation of an operation lever 8 executed by the operation rod 3, and temporarily grips the aerial wire G by an initial gripping force of a compression spring 81 with the lower clamp 6. A link mechanism 7 is connected to the lower clamp 6 so as to push up the lower clamp 6 following traction, thereby gripping the aerial wire G with the upper clamp 5 by a gripping force added to the initial gripping force.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] In construction work such as replacing an overhead line such as an existing overhead ground wire or replacing ancillary equipment around the overhead line, the overhead line is pulled to the tower and temporarily fastened while the work of disconnecting or connecting the overhead line from the tower is being carried out, and the tension is temporarily transferred to the tower to remove tension from the work area. The present invention relates to a come-along used in such construction work to pull the overhead line to the tower side and temporarily support it. [Background technology]

[0002] For example, when disconnecting an existing overhead line from its connection to a tower, the overhead line is separately tensioned with a come-along and temporarily fastened to the tower, and the tension at the connection is temporarily applied to the tower before work can begin. In this case, the come-along must be attached to the overhead line at a position farther away from the tower than the connection. The come-along described in Patent Document 1 includes a two-part wedge member that grips an electric wire, a cylindrical come-along body into which the wedge member is inserted, and an arm that connects to the come-along body. The outer peripheral surface of the wedge member and the inner peripheral surface of the come-along body are tapered toward the insertion side. After the wedge member with the electric wire inserted is attached to the come-along body and connected to a steel tower, the arm is pulled in with a chain block or the like, causing the wedge member and the come-along body to grip the electric wire and tighten the wire. The come-along described in Patent Document 2 has an arm connected to the wire of a chain block coupled to a steel tower, and a clamp equipped with a pair of opposing clamping pieces that receive and grip the electric wire inside, connected by a link. The pair of clamping pieces grip the electric wire and can tension it by the relative movement between the arm and the clamp in the wire extension direction as the arm is pulled in by the chain block. The self-propelled come-along described in Patent Document 3 comprises a main body that can move by passing the overhead electric wire between it and a wedge, and a self-propelled vehicle positioned behind the main body in the direction of travel. The self-propelled vehicle uses a push rod to push the main body along the overhead electric wire, transporting it to a predetermined gripping position. After the self-propelled vehicle is driven in reverse to retrieve the wire, the wire connected to the handle of the main body is pulled by a winch or the like, and the wedge is pushed into the main body via a cam mechanism, thereby gripping and pulling the electric wire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 58-193807 [Patent Document 2] Patent No. 4121081 [Patent Document 3] Publication No. 3-006100 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0004] In both the come-alongs described in Patent Documents 1 and 2, installation and removal work requires a worker to ride on a flying machine suspended from the overhead wire and move to a position beyond the connection point (for example, the tip of the insulator).The use of a flying machine itself is prohibited for small-diameter overhead wires, so there is a problem in that this cannot be applied. The self-propelled come-along described in Patent Document 3 cannot be used if there are obstacles such as dampers on the electric wires, and because it requires a driving source such as a power source, it is heavy and overall workability is reduced.In addition, there are problems such as the electrical equipment deteriorating quickly over time and the difficulty of recovering equipment due to breakdowns, which are prone to problems due to the vulnerability of the electrical equipment. Therefore, the present invention aims to provide a robust come-along for pulling in overhead wires that can be attached to and detached from overhead wires by a worker on a steel tower by remote control without using a flying machine or an electrically powered self-propelled machine, and also to provide a construction method using the same for temporarily supporting the tension of the overhead wire on the steel tower during construction. [Means for solving the problem]

[0005] In the following description, reference will be made to the reference numerals in the accompanying drawings, but the present invention is not limited thereto. To solve the above problem, the come-along 1 of the present invention comprises a gripping device 2 and an operating rod 3 connected thereto. The gripping device 2 grips the overhead wire G between upper and lower clamps 5, 6 at a position away from the tower T on the overhead wire G that is fastened to the tower T, and is pulled to the tower T by a towing means such as a chain block C. The operating rod 3 is connected to the gripping device 2 and is provided so that the gripping device 2 can be remotely operated from above the tower T. The gripping device 2, which has received the overhead wire G between the open upper and lower clamps 5, 6, slides along the overhead wire G to an installation position, pulls it back, and brings the upper and lower clamps 5, 6 closer to each other to temporarily grip the overhead wire G with an initial gripping force, then separates them to release the grip. These operations are performed remotely from above the tower T using the operating rod 3. The gripping device 2 comprises a main body 4, and an upper clamp 5, a lower clamp 6, an operating lever 8, and a link mechanism 7 supported thereon. The upper clamp 5 is placed on the overhead wire G and is movable up and down relative to the lower clamp 6 between a lower gripping position where it grips the overhead wire G together with the lower clamp 6 and an upper open position where it releases the gripping position. The lower clamp 6 is located below the upper clamp 5 and is movable up and down relative to the upper clamp 5 between an upper gripping position where it grips the overhead wire G together with the upper clamp 5 and an upper open position where it releases the gripping position. The operating lever 8 is pivotally supported on the main body 4 by a pivot 86 at one end so as to be swingable up and down, and is connected at the other end to the tip of the operating rod 3, holding a compression spring 84 therebetween, thereby remotely adjusting the tilt angle relative to the main body 4. The link mechanism 7 is connected at one end to the traction means and connected at the other end to the lower clamp 6. The operating lever 8 presses the upper clamp 5 to the gripping position with the compression spring 84 at a first tilt angle relative to the main body 4, and the overhead wire G is temporarily gripped between the upper clamp 5 and the lower clamp 6 with an initial gripping force. The main body 4 has a first engagement portion 451 that holds the operating lever 8 at a first tilt angle. The operating lever 8 has an engagement member 83 that engages with and disengages from the first engagement portion 451. The engagement member 83 is biased in a direction that engages with the first engagement portion 451, and can be operated at the base end side of the operating rod 3 via a transmission means such as an operating wire 85.The link mechanism 7 is connected to the lower clamp 6 so as to push the lower clamp 6 up to the gripping position as it is pulled by the pulling means, thereby gripping the overhead wire G between the upper clamp 5 with a gripping force that is additional to the initial gripping force. Furthermore, the method for temporarily supporting an overhead wire G using the come-along 1 of the present invention includes a first step of taking the overhead wire G between the upper and lower clamps 5, 6 of the gripping device 2 with the upper and lower clamps 5, 6 open, and supporting the gripping device 2 on the overhead wire G; a second step of sliding the gripping device 2 on the overhead wire to a predetermined installation position using the operating rod 3 connected to the gripping device 2; a third step of rotating the operating rod 3 downward to hold the operating lever 8 at a first tilt angle position, pressing the upper clamp 5 to the gripping position with the compression spring 84, and temporarily gripping the overhead wire G between the lower clamp 6 and the upper clamp 5 with an initial gripping force; and a third step of pulling one end of the link mechanism 7 with the pulling means to push up the lower clamp 6 and remove the upper clamp 5 from the overhead wire G. The method includes a fourth step of temporarily supporting the overhead wire G by holding the overhead wire G between the lamp 5 and the overhead wire G with a holding force added to the initial holding force, and pulling it toward the tower T, thereby eliminating the tension on the overhead wire G at the specified construction location; a fifth step of reducing the holding force between the upper and lower clamps 5, 6 by releasing the pulling force by the pulling means; a sixth step of operating the transmission means at the base end side of the operating rod 3 to disengage the engaging member 83 of the operating lever 8 from the first engaging portion and rotating the base end side of the operating rod 3 upward, thereby returning the upper clamp 5 to the open position, releasing the grip on the overhead wire G and releasing the tension; and a seventh step of pulling the operating rod 3 to pull the holding device 2 along the overhead wire G to the hand and removing it from above the overhead wire G. [Effects of the Invention]

[0006] According to the present invention, a robust come-along for pulling in overhead wires can be provided that can be easily attached to and detached from overhead wires by a worker on a steel tower via remote control without using a flying machine or an electrically powered self-propelled machine. Furthermore, the come-along can be used to safely and quickly perform temporary support work for overhead wires. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view of a come-along for holding an overhead wire according to the present invention; FIG. [Figure 2] FIG. 2 is an explanatory diagram of the come-along of FIG. 1 in use. [Figure 3] FIG. 2 is a front view of the come-along of FIG. 1. [Figure 4] FIG. 2 is a front view of a gripping device in the come-along of FIG. 1. [Figure 5] 5 is a cross-sectional view of FIG. 4 taken along line V-V. [Figure 6] 6 is a cross-sectional view taken along the line VI-VI in FIG. 4. [Figure 7] FIG. 2 is a perspective view of a gripping device main body in the come-along of FIG. 1. [Figure 8] FIG. 2 is a perspective view of an upper clamp in the come-along of FIG. 1. [Figure 9] FIG. 2 is a perspective view of a lower clamp and a push-up lever in the come-along of FIG. 1. [Figure 10] FIG. 2 is a perspective view of an operating lever in the come-along of FIG. 1. [Figure 11] 2A and 2B show the operation process (release) of the come-along of FIG. 1, in which (A) is a front view and (B) is a side view. [Figure 12] 2A and 2B show the operation process (derailment prevention) of the come-along in FIG. 1, where (A) is a front view and (B) is a side view. [Figure 13] 2A and 2B show the operation process (temporary grip) of the come-along shown in FIG. 1, in which (A) is a front view and (B) is a side view. [Figure 14] 2A and 2B show the operation process (temporary support) of the come-along of FIG. 1, in which (A) is a front view and (B) is a side view. BEST MODE FOR CARRYING OUT THE INVENTION

[0008] An embodiment of a come-along for holding an overhead wire according to the present invention will be described with reference to the drawings.

[0009] As shown in Figure 2, for example, in construction work such as replacing an existing overhead line G that is attached to a steel tower T, the overhead line G is temporarily secured to the steel tower T and tensioned while the overhead line G is being removed from the insulator string I. The Come Along 1 is used to grasp the overhead line G in front of the removal point with the gripping device 2, and pull the overhead line G to the steel tower T and temporarily support it using a traction means such as a traction wire W or chain block C, and then remove it from the overhead line G and recover it after the construction work is completed.

[0010] As shown in Figures 1 and 3, the come-along 1 comprises a gripping device 2 and an operating rod 3. The gripping device 2 is placed on an overhead wire G, such as an existing overhead ground wire, that is fastened to a steel tower T, and grips the overhead wire G, allowing it to be pulled by a chain block C or the like on the steel tower T via a towing wire W.

[0011] The operating rod 3 can be connected and disconnected from the gripping device 2, and can be remotely controlled from the tower T to send the gripping device 2 to a predetermined installation position on the overhead wire G, and to apply or remove an initial gripping force to the overhead wire G to the gripping device 2.

[0012] 4 to 6, the gripping device 2 comprises a main body 4, an upper clamp 5 supported on the main body 4 so as to be movable up and down relative to the main body 4 and placed on the overhead wire G, and a lower clamp 6 positioned below and facing the upper clamp 5 and supported on the main body 4 via a link mechanism 7 so as to be movable up and down relative to the main body 4. The link mechanism 7 is supported on the main body 4, connected to the pulling wire W at one end, and connected to the lower clamp 6 at the other end.

[0013] The upper clamp 5 is configured to descend relative to the main body 4 by an operating lever 8 that swings in conjunction with the downward rotation of the operating rod 3, thereby temporarily gripping the overhead wire G with an initial gripping force between it and the lower clamp 6, and to rise and release the grip by an upward rotation operation.

[0014] The link mechanism 7 is connected to the lower clamp 6 so as to push up the lower clamp 6 as the pulling wire W is pulled, thereby gripping the overhead wire G between the upper clamp 5 with a gripping force that is additional to the initial gripping force.

[0015] As shown in Figures 5 to 7, the main body 4 of the gripping device 2 includes a vertical, flat support plate 41 disposed along the overhead wire G on one side (rear side) of the overhead wire G in the direction perpendicular to the wire extension, and a horizontal plate 42 extending forward from the upper edge of the support plate 41 and perpendicularly overhanging the overhead wire G. The horizontal plate 42 includes a guide tube 43 in the center, a bearing projection 44 in the front direction of the wire extension, and an engagement projection 45 in the rear. The engagement projection 45 includes first and second upper and lower engagement portions 451, 452. A rib 411 is formed on the rear side of the support plate 41. A link support plate 46 is fixed to the lower front side of the support plate 41, parallel to and spaced from it. The link support plate 46 is fixed to the support plate 41 with bolts 47 and 48. The bolts 47 and 48 pivotally support the link mechanism 7 between the support plate portion 41 and the link support plate 46 .

[0016] 6 and 8, the upper clamp 5 is disposed in front of the support plate portion 41 and comprises a clamp body 51 placed on the overhead wire G, and a lifting rod 52. As shown in Fig. 8, the lifting rod 52 extends vertically upward from the center of the clamp body 51 and passes through the guide tube portion 43 of the main body 4 so as to be able to move up and down, and is connected to the operating lever 8. The lifting rod 52 has, at its upper portion protruding from the guide tube portion 43, an axially elongated hole 52a and a small-diameter spring receiving rod portion 52c that extends upward via a spring receiving step portion 52b.

[0017] The upper clamp 5 is provided with a guide frame 53 extending downward and forward from the lower edge of the clamp body 51 so as to guide the clamp body 51 below the upper clamp 5 when the clamp body 51 is placed on the overhead wire G.

[0018] 9, the lower clamp 6 comprises a clamp body 61 and a link plate 62. The clamp body 61 abuts against the underside of the overhead wire G and grips the overhead wire G between it and the upper clamp 5. A pair of link plates 62 extend downward, sandwiching the clamp body 61 from the front and rear, and are pivotally attached at their bottoms to the middle part of the push-up lever 72 by a shaft 74.

[0019] 4, 5, and 10, the pipe-shaped operating lever 8 is pivotally supported at one end by a pivot 86 on the bearing projection 44 of the main body 4 so as to be able to swing freely up and down, and the other end is connected to the tip of the operating rod 3. The operating lever 8 has a long hole 8a provided at the other end position near the pivot 86 through which the lift rod 52 passes in the vertical direction, and holds a compression spring 81 that presses against the lift rod 52. The operating lever 8 is connected to the lift rod 52 at the through-portion of the lift rod 52 by a through-shaft 87 that passes through the long hole 52a.

[0020] The compression spring 81 is held in a spring case 82 whose lower part is pivotally supported on the operating lever 8 by a through shaft 87, and its lower end is engaged on the spring receiving step 52b of the lifting rod 52.

[0021] The operating lever 8 has an elongated hole 8b through which the engaging protrusion 45 of the main body passes in the vertical direction. An engaging member 83 that engages with and disengages from the engaging protrusion 45 is provided inside the operating lever 8, adjacent to this elongated hole 8b. The engaging member 83 is made up of a plunger pin, and its tip side is biased by an internal spring 84 in a direction that engages with the engaging portions 451, 452, and an operating wire 85 is engaged with its base end side. The operating wire 85 is drawn out from the elongated hole 8c and extends along the operating rod 3 to its base end side so that it can be remotely operated together with the operating rod 3.

[0022] 13, the operating lever 8 is held at a first tilt angle at which the engaging member 83 engages with the first engaging portion 451 of the engaging projection 45, i.e., at an tilt angle at which the operating lever 8 is approximately parallel to the overhead wire G, and the compression spring 81 presses the upper clamp 5 down to the gripping position. The upper clamp 5 provisionally grips the overhead wire G between itself and the lower clamp 6 with the initial gripping force due to this spring force.

[0023] When the operating lever 8 engages the engaging member 83 with the second engaging portion 452 of the engaging projection 45 and is held at the second inclination angle shown in Figure 12, the upper clamp 5 does not descend to the gripping position and the overhead wire G is not gripped between the upper and lower clamps 5, 6. In this state, the tip of the guide frame 53 is lower than the upper surface of the lower clamp 6. Therefore, when the gripping device 2 is moved over the overhead wire G in this state, the guide frame 53 closes the lateral opening between the upper and lower clamps 5, 6, preventing the gripping device 2 from derailing from the overhead wire G.

[0024] 11, the operating lever 8 is released from the engaging projection 45 at an inclination angle position greater than the second inclination angle position, so the inclination angle can be freely changed to compress the spring 81 and widely open the space between the upper and lower clamps 5 and 6. Therefore, in this state, when the gripping device 2 is attached to the overhead wire G, it is easy to insert the overhead wire G between the upper and lower clamps 5 and 6.

[0025] 4 and 5, the link mechanism 7 is supported between the support plate portion 41 of the main body 4 and the link support plate 46 (FIG. 5). The link mechanism 7 includes a generally arc-shaped pulling lever 71 connected to the pulling wire W, and a generally L-shaped push-up lever 72 that rotates to push up the lower clamp 6 when the pulling lever 71 is pulled (FIG. 4).

[0026] The traction lever 71 is connected at one end to the traction wire W, pivoted to the main body 4 by a bolt 48 at a circular arc-shaped elongated hole 71a in the middle, and pivoted at the other end to one end of the push-up lever 72 by a shaft 73. The push-up lever 72 is pivoted at the middle to the link plate 62 of the lower clamp 6 by a shaft 74, and pivoted at the other end to the main body 4 by a bolt 47. A tension spring 75 is interposed between the traction lever 71 and the link plate 62 of the lower clamp 6. This prevents the traction lever 71 from rotating solely by the load of the traction means, such as the traction wire W or chain block C, connected to the traction lever 71, and therefore the lower clamp 6 is held in a lower position until the traction lever 71 is pulled.

[0027] Next, we will explain the wire stringing operation using the come-along 1 of the present invention. As shown in Figure 11, when the operating lever 8 is not engaged with the engaging protrusion 45 and therefore the upper and lower clamps 5 and 6 of the gripping device 2 are open, the guide frame 53 is hung on the overhead wire G and the overhead wire G is taken in between the upper and lower clamps 5 and 6 (below the upper clamp 5). In this state, the entire device is supported on the overhead wire G.

[0028] Next, as shown in Figure 12, the operating rod 3 is swung downward to engage the operating lever 8 with the second engaging portion 452 of the engaging projection 45. During this time, the lifting rod 52 descends relative to the main body 4 together with the upper clamp body 51. Because the clamp body 51 is resting on the overhead wire G, the main body 4 is pulled up relative to the overhead wire G together with the lower clamp 6, and the gap between the upper and lower clamps 5, 6 narrows, but in this state the overhead wire G is not gripped. However, the guide frame 53 closes the lateral opening between the upper and lower clamps 5, 6, preventing the gripping device 2 from derailing.

[0029] In this state, while pushing the operating rod 3, the gripping device 2 is slid over the overhead wire G to move it to a predetermined position. When the gripping device 2 reaches the predetermined position, the operating rod 3 is further swung and rotated downward to engage the operating lever 8 with the first engaging portion 451 of the engaging protrusion 45, causing the upper clamp 5 to further descend, and the overhead wire G is provisionally gripped between the upper and lower clamps 5, 6 with the initial gripping force of the compression spring 81, as shown in Figure 13.

[0030] Next, when the traction wire W connected to the traction lever 71 is pulled toward the tower T by the chain block C, the traction force exceeds the spring force of the tension spring 75, and the push-up lever 72 rotates counterclockwise around the axis 47 in Figure 14 (A), pushing up the lower clamp 6 via the axis 74, increasing the gripping force of the overhead wire G and pulling the overhead wire G toward the tower T.

[0031] This completes the wiring work. The tension on the overhead wire G at the construction site is now removed, and the specified construction work can begin.

[0032] Once the required construction work is completed, the chain block C is loosened and the gripping force between the upper and lower clamps 5, 6 is reduced, and then the operating wire 85 is pulled to disengage the engaging member 83 from the first engaging portion 451, and the operating rod 3 is rotated upward to an angle (Figure 12) at which the engaging member 83 engages with the second engaging portion 452. This causes the upper clamp 6 to rise to the open position, releasing its grip on the overhead wire G and releasing the tension on the overhead wire G.

[0033] In this state, the operating rod 3 is pulled in to pull the gripping device 2 toward the steel tower T. During this time, the guide frame 53 closes the side opening between the upper and lower clamps 5 and 6, so the gripping device 2 will not derail from the overhead wire G. Once the gripping device 2 has been pulled close to hand, the operating wire 85 is pulled to disengage the engaging member 83 from the second engaging portion 452, releasing the operating lever 8, and the operating rod 3 is further pulled up to further open the space between the upper and lower clamps 5 and 6, allowing the gripping device 2 to be removed from the overhead wire G and recovered. [Explanation of symbols]

[0034] 1 Come Along 2 Gripping device 3 Control stick 4. Main body of the gripping device 41 Support plate part 411 Rib 42 Horizontal plate section 43 Guide tube 44 Bearing protrusion 45 Engagement protrusion 451 first engagement portion 452 Second engagement part 46 Link support plate 47 volts 48 volts 5 Upper clamp 51 Upper clamp body 52 Lifting rod 52a long hole 52b Spring receiving step 52c Spring retainer rod 53 Guide Frame 6 Lower Clamp 61 Lower clamp body 62 Link Plate 7 Link mechanism 71 Towing lever 71a Arc-shaped slot 72 Push-up lever 73 axes 74 axes 75 Tension spring 8 Operating lever 8a long hole 8b long hole 8c long hole 81 Compression spring 82 Spring case 83 Engagement member 84 Interior spring 85 Control wire 86 Axis 87 Through shaft C Chain Block G overhead line I Insulator Ren T-pylon W towing wire

Claims

1. a holding device that is disposed on an overhead wire attached to a steel tower at a position away from the steel tower, holds the overhead wire between upper and lower clamps, and is pulled to the steel tower by a pulling means; the holding device is connected to the holding device, and is capable of sliding the holding device, which has received the overhead wire between the opened upper and lower clamps, over the overhead wire to an installation position and then pulling it back; and an operating rod for remotely operating the holding device from above the tower so as to bring the upper and lower clamps closer together to temporarily hold the overhead wire with an initial holding force and then separate them to release the holding force; the gripping device comprises a main body, the upper clamp placed on the overhead wire and supported on the main body so as to be relatively movable up and down between a lower gripping position where the overhead wire is gripped between the upper clamp and the upper clamp and an upper open position where the overhead wire is released; the lower clamp facing below the upper clamp and supported on the main body so as to be relatively movable up and down between an upper gripping position where the overhead wire is gripped between the upper clamp and the lower open position where the overhead wire is released; an operating lever pivoted to the main body by a pivot at one end so as to be freely swingable up and down, and connected to the tip of the operating rod at the other end so that the inclination angle relative to the main body can be remotely adjusted, the operating lever holding a compression spring therebetween; and a link mechanism supported on the main body, connected to the traction means at one end, and connected to the lower clamp at the other end. the operating lever is provided so as to press the upper clamp to a gripping position by the compression spring at a first inclination angle relative to the main body, and temporarily grip the overhead wire between the upper clamp and the lower clamp with an initial gripping force, the main body includes a first engagement portion that holds the operating lever at the first tilt angle; the operating lever includes an engaging member that is biased in a direction to engage with the first engaging portion and that can be engaged with and disengaged from the first engaging portion at a base end side of the operating rod, The link mechanism is connected to the lower clamp so as to push the lower clamp up to the gripping position when pulled by the pulling means, thereby gripping the overhead wire between the link mechanism and the upper clamp with a gripping force that is additional to the initial gripping force.

2. The upper clamp includes a lift rod extending above the body, the lift rod having an axially elongated hole; the operating lever has an elongated hole in the axial direction, and is pivotally attached to the lifting rod by a through shaft that movably passes through the elongated hole and the elongated hole of the lifting rod; the compression spring is held by a spring receiving member connected to the operating lever by the through shaft of the operating lever, and is provided so that a lower end thereof abuts against the lifting rod; The come-along for pulling overhead wires as described in claim 1, characterized in that when the operating lever is pressed down to the first inclination angle, the spring receiving member descends together with the pivot relative to the lifting rod, and the compression spring presses the upper clamp together with the lifting rod to the gripping position.

3. A cam-along for pulling overhead lines as described in claim 1 or 2, characterized in that the engaging member is biased by an internal spring in a direction to engage with the first engaging portion of the main body, is connected to an operating wire extending along the operating rod toward the base end of the operating rod, and is configured to be able to engage and disengage with the first engaging portion of the main body by pulling and retracting the operating wire.

4. The main body includes a flat support plate portion disposed vertically along the overhead wire on the rear side, which is one side of the overhead wire in the direction perpendicular to the extension of the overhead wire, and a vertical guide tube portion provided so as to protrude from an upper portion of the support plate portion onto the overhead wire on the front side, which is the other side of the overhead wire in the direction perpendicular to the extension of the overhead wire, the upper clamp is provided so that the lifting rod passes through the guide tube portion and moves up and down along the front side surface of the support plate portion, the upper clamp is provided with a guide frame that extends forward at a downward forward incline so as to guide the overhead wire below the upper clamp when the upper clamp is placed on the overhead wire; the main body further includes a second engagement portion that holds the operating lever at a second tilt angle that is greater than the first tilt angle; The overhead wire pulling come-along according to claim 2, characterized in that the upper and lower clamps and the guide frame are arranged so that when the operating lever is in the second tilt angle position, the overhead wire is not gripped between the upper and lower clamps and the guide frame closes the side opening between the upper and lower clamps, preventing the overhead wire from falling out from between the upper and lower clamps.

5. The overhead line pulling come-along according to claim 4, characterized in that the operating lever is arranged so that the inclination angle relative to the main body can be freely changed when the operating lever is at an inclination angle position greater than the second inclination angle position.

6. the link mechanism includes a push-up lever that rotates to push up the lower clamp in response to pulling by the pulling means, A cam-along for pulling overhead wires as described in any one of claims 1 to 5, characterized in that the lower clamp is biased downward by a tension spring so as to hold it in a lower open position away from the upper clamp until the link mechanism is pulled by the pulling means.

7. A temporary support method for overhead wire tension using the come-along according to claim 1, a first step of taking the overhead wire between the upper and lower clamps of the holding device in an open state and supporting the holding device on the overhead wire; a second step following the first step of sliding the gripping device on the overhead wire by the operating rod connected to the gripping device to move the gripping device to a predetermined installation position; a third step following the second step of rotating the operating rod downward to hold the operating lever at the first tilt angle position, and pressing the upper clamp to a gripping position with the compression spring to temporarily grip the overhead wire between the upper clamp and the lower clamp with an initial gripping force; a fourth step following the third step, in which one end of the link mechanism is pulled by the pulling means, thereby pushing up the lower clamp and gripping the overhead wire between the lower clamp and the upper clamp with a gripping force added to the initial gripping force, while pulling the overhead wire toward the tower and temporarily supporting it, thereby eliminating tension on the overhead wire at a predetermined construction location; a fifth step of reducing the gripping force between the upper and lower clamps by releasing the traction by the traction means after completion of the work at the predetermined work location; a sixth step following the fifth step of operating the engaging member of the operating lever to disengage from the first engaging portion and rotating the base end side of the operating rod upward to return the upper clamp to the open position and release the tension by releasing the grip on the overhead wire; A temporary support method for overhead wire tension, characterized in that following the sixth step, it includes a seventh step of pulling the operating rod to pull the holding device along the overhead wire to the hand and removing it from the overhead wire.

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