Section insulator wedge removal device

Abstract

To provide a wedge extraction device which enables any operator to easily carry out work irrespective of skills of an operator, and with no possibility of damaging a metal fitting.SOLUTION: A wedge extraction device 1 comprises: an abutment member 2 annularly disposed to abut at a bottom surface against an upper end surface 12a of a connection part 12 of a section insulator 11; a pair of fastening members 3 superposed on the abutment member 2 to face each other so as to grip a projected part 14c of a wedge 14 from the connection part 12; a fastening bolt 4 that fastens the fastening members 3 to each other in a direction orthogonal to the axis of the wedge 14 so as to grip the projected part 14c of the wedge 14; and push bolts 5 that penetrate the fastening members 3 through the wedge 14 in the axis direction, abut at the tips against a top surface of the abutment member 2, and separate the fastening members 3 gripping the wedge 14 from the abutment member 2 through screwing-in.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The trolley wires connected to different power sources are electrically insulated and connected via section insulators at power supply division points. The present invention relates to a device for removing from the section insulator a cone chuck-type wedge used to prevent the trolley wire from coming loose at the connection between the section insulator and the trolley wire. [Background technology]

[0002] A conventional device for extracting a contact wire from a section insulator is disclosed in Patent Document 1. This device comprises a square-bar-shaped lower member having a contact portion on the underside of one end that contacts the upper surface of the section insulator, a square-bar-shaped upper member having a fixing portion on one end that grips the end of the contact wire protruding from the section insulator, a connecting member that connects the upper member to the lower member so that the upper member can tilt freely, and an approaching means such as a bolt that brings the other end of the lower member and the other end of the upper member closer to each other.When the bolt is tightened to bring the other ends of the lower member and the upper member closer to each other, one end of the upper member that grips the end of the contact wire rises relative to one end of the lower member, and the contact wire is extracted from the section insulator. Other methods that have been used include gripping the protruding part of the wedge with a pliers-type tool and pulling it out, or striking the wedge with a tool such as a flathead screwdriver and a hammer to remove the wedge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-158224 Summary of the Invention [Problem to be solved by the invention]

[0004] The device described in Patent Document 1 cannot be used at sites where the amount of protrusion of the contact wire varies depending on the site and there is not enough gripping space to hold the contact wire. All other methods rely heavily on the skill and ability of the worker, and there is also the possibility of damaging the metal fittings during the work. Therefore, an object of the present invention is to provide a wedge extracting device that can be easily performed by anyone regardless of the skill of the worker and that does not cause damage to metal fittings. [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. In order to solve the above problem, the wedge removal device 1 of the present invention comprises: an abutment member 2 arranged in an annular shape so that its underside abuts against the upper end surface 12a of the connection portion 12 from which the end of the cone chuck-type wedge 14 in the section insulator 11 protrudes; a pair of tightening members 3 arranged opposite each other and overlapping on the abutment member 2 so as to grip the outer periphery of the protruding portion 14c of the wedge 14 from the connection portion 12; a tightening bolt 4 that tightens between the pair of tightening members 3 in a direction perpendicular to the axis of the wedge 14 so as to grip the protruding portion 14c of the wedge 14; and a push bolt 5 that penetrates each of the pair of tightening members 3 in the axial direction of the wedge 14, has its tip abutting against the upper surface of the abutment member 2, and pulls the tightening members 3 gripping the wedge 14 away from the abutment member 2 when tightened. [Effects of the Invention]

[0006] According to the present invention, since the protruding portion of the wedge is gripped by a pair of fastening members, the wedge can be attached to the section insulator regardless of the length of the protruding dimension of the contact wire from the section insulator, and the wedge can be removed by simply tightening the push bolt, which does not require skill or great force. Since the work can be done without applying impact or shock, there is no damage to the components. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a front view of the wedge removal device of the present invention attached to a section insulator. [Figure 2] FIG. 2 is a plan view of the state shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2. [Figure 5] FIG. 10 is a front view of the state in which the wedge has been removed. [Figure 6] FIG. 4 is a cross-sectional view taken at the same position as FIG. 3 with the wedge removed. [Figure 7] FIG. 5 is a cross-sectional view taken at the same position as FIG. 4 with the wedge removed. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] 10 is a cross-sectional view of the trolley wire connection portion of the section insulator before the wedge is removed. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] Fig. 11 shows one end of a section insulator 11 from which a wedge is to be removed using the wedge removal device of the present invention. The section insulator 11 has a generally cylindrical connection portion 12 for retaining the end of a trolley wire 13. The end of the trolley wire 13 is inserted into this connection portion 12. Within the connection portion 12, the trolley wire 13 is held by a pair of holding pieces 14a of a cone chuck-type wedge 14, and is prevented from slipping out of the connection portion 12.

[0009] The wedge 14 has a pair of opposing slits 14b for forming a pair of gripping pieces 14a. One slit 14b extends over the entire length, while the other slit 14b terminates at the base end 14c, leaving a continuous portion 14d. The cylindrical base end 14c of the wedge 14 and the upper end of the contact wire 13 protrude from the upper end surface 12a of the connection part 12.

[0010] The wedge 14 is pulled into the connection part 12 by the tension of the trolley wire 13 when the section insulator 11 is installed, and since the pair of gripping pieces 14a tightly grip the trolley wire 13, it cannot be easily removed from the connection part 12.

[0011] The wedge removal device 1 of the present invention for removing the wedge 14 from the section insulator 11 described above comprises a pair of abutment members 2, a pair of tightening members 3, a pair of tightening bolts 4, and a pair of pushing bolts 5, as shown clearly in Figure 8.

[0012] The pair of contact members 2 includes a contact plate 21 made of a half doughnut-shaped metal plate, and a pair of cylindrical guide pins 22 standing vertically from the contact plate 21.

[0013] As shown in Figure 1, the abutment member 2 is arranged in an annular shape so that, when in use, its lower surface abuts against the upper end surface 12a of the connection portion 12 of the section insulator 11, and the axis of the guide pin 22 is arranged parallel to the axis of the wedge 14.

[0014] As clearly shown in Figures 1 and 8, the pair of fastening members 3 consist of half-donut-shaped metal blocks, and when in use, they are placed on top of the abutting member 2, facing each other so as to grip the outer periphery of the base end 14c of the wedge 14 protruding from the connecting portion 12.

[0015] As shown clearly in FIGS. 8 to 10, the fastening member 3 is provided with a grip recess 31, a guide hole 32, a push bolt screw hole 33, a fastening bolt insertion hole 34, and a screw hole 35.

[0016] The gripping recess 31 has a generally semicircular cross section that follows the outer periphery of the base end 14c of the wedge 14, and on its inner periphery is formed an engaging protrusion 36 that engages with the split groove 14b of the wedge 14. When the fastening member 3 is placed on top of the abutting member 2, as shown in Figure 3, the engaging protrusion 36 is positioned so as to face the split groove 14b.

[0017] The guide hole 32 is a through hole through which the guide pin 22 is inserted when the fastening member 3 is attached to the abutting member 2 in an overlapping manner, and guides the vertical up and down movement of the fastening member 3 relative to the abutting member 2.

[0018] The press bolt screw holes 33 are threaded holes provided in parallel to the guide holes 32, which penetrate vertically, and into which press bolts 5 are screwed to press up the tightening member 3 from the abutting member 2. The press bolts 5 are screwed into the appropriate screw hole 33 depending on the mounting direction of the wedge 14, etc.

[0019] The tightening bolt insertion hole 34 and the tightening bolt screwing hole 35 are provided at opposing positions on either side of the gripping recess 31, in a direction perpendicular to the guide hole 32, and a tightening bolt 4 for gripping the wedge 14 is inserted and screwed between the pair of tightening members 3.

[0020] The operation of removing the wedge 14 from the connection portion 12 of the section insulator 11 will now be described. As shown in Figures 1 to 4, a pair of components, consisting of a contact member 2 and a tightening member 3 to which a pressure bolt 5 has been attached, is placed facing each other on the upper end surface 12a so as to sandwich the base end 14c of the wedge 14 protruding from the connection portion 12. At this time, the engaging protrusion 36 of the tightening member 3 is butted against the split groove 14b of the wedge 14. The axial position of the split groove 14b relative to the connection portion 12 varies from site to site. Therefore, the screwing position of the pressure bolt 5 is determined each time by appropriately selecting the opposing press bolt screwing hole 33 at a position that makes it easy to screw it in.

[0021] Next, the clamping bolt 4 is threaded into the clamping bolt threaded hole 35 through the clamping bolt insertion hole 34 to clamp the pair of clamping members 3, and the base end 14c, which is the protruding part of the wedge 14, is gripped between them. At this time, the engaging protrusion 36 is pressed into the narrowed split groove 14b of the wedge 14, acting to open the split groove 14b.

[0022] Next, the pressing bolt 5 is evenly advanced downward until its tip projects from the underside of the tightening member 3, thereby pushing the tightening member 3 together with the wedge 14 up onto the abutment member 2, as shown in Figures 5 to 7. At this time, the engaging protrusion 36 abuts against the end of one of the split grooves 14b, preventing the tightening member 3 and the wedge 14 from sliding. The wedge 14 is then removed from the connection portion 12 of the section insulator 11.

[0023] If the gripping force of the wedges by the fastening member 3 is strong enough to prevent slippage between them, the engaging protrusions 36 can be omitted.

[0024] In the above embodiment, the contact member 2 is configured as a pair of half-donut shaped members, but it may be configured as a single annular member, and the guide pin may be omitted.

[0025] In the above-described removal operation, the protruding portion 14c of the wedge 14 is gripped by a pair of fastening members 3, so that the wedge removal device 1 can be easily attached to the connection portion 12 of the section insulator 11 regardless of the length of the protruding dimension of the trolley wire 13 from the section insulator 11. Furthermore, the operation does not require skill or great force, and no damage to the components is caused by impact or shock. [Explanation of symbols]

[0026] 1 Wedge removal device 2 Contact member 21 Contact plate 22 Guide pin 3 Fastening member 31 Gripping recess 32 Guide hole 33 Push bolt screw hole 34 Fastening bolt insertion hole 35 Fastening bolt screw hole 36 Engagement protrusion 4 Fastening bolts 5 Push Bolt 11 Section insulator 12 Connection 12a Top surface 13 Contact wire 14 Wedge 14a Grip piece 14b split groove 14c Proximal end 14d Continuous section

Claims

1. A device for extracting a trolley wire from a section insulator connected to the trolley wire by gripping an end of the trolley wire inserted into a generally cylindrical connecting part with a cone chuck-type wedge having a pair of gripping pieces to prevent the wedge from coming out, a contact member that is annularly arranged so that its lower surface contacts the upper end surface of the connection portion from which the end of the wedge protrudes; a pair of fastening members disposed opposite each other and overlapping on the upper surface of the abutting member so as to grip the outer periphery of the protruding portion of the wedge from the connecting portion; a fastening bolt that fastens the pair of fastening members in a direction perpendicular to the axis of the wedge so as to grip the protruding portion of the wedge; a push bolt that penetrates each of the pair of fastening members in the axial direction of the wedge, has a tip that abuts against the outer surface of the abutment member, and pulls the fastening members that grip the wedge away from the abutment member when tightened.

2. 2. The wedge extracting device for a section insulator according to claim 1, wherein the abutting member is composed of a pair of members arranged opposite each other in an annular shape.

3. 2. The section insulator wedge removal device according to claim 1, wherein the pair of fastening members each include a gripping recess along an outer periphery of the wedge and an engaging protrusion protruding from an inner periphery of the gripping recess so as to engage with a half groove of the wedge.

4. the abutment member is composed of a pair of components arranged annularly facing each other, each of which is provided with a guide pin standing vertically; 2. The wedge removal device for a section insulator according to claim 1, wherein the pair of fastening members face respective components of the abutting member and are provided with guide holes through which the guide pins are inserted.

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