WO2008085692A1 - Mécanisme serre-câble et boîtier de connexion de câbles le comprenant - Google Patents

Mécanisme serre-câble et boîtier de connexion de câbles le comprenant Download PDF

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Publication number
WO2008085692A1
WO2008085692A1 PCT/US2007/088324 US2007088324W WO2008085692A1 WO 2008085692 A1 WO2008085692 A1 WO 2008085692A1 US 2007088324 W US2007088324 W US 2007088324W WO 2008085692 A1 WO2008085692 A1 WO 2008085692A1
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WO
WIPO (PCT)
Prior art keywords
cable
cables
clamping
base
clamp
Prior art date
Application number
PCT/US2007/088324
Other languages
English (en)
Inventor
Hiroyuki Chiba
Shinichi Ono
Kenneth D. Rebers
Original Assignee
3M Innovative Properties Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Company filed Critical 3M Innovative Properties Company
Publication of WO2008085692A1 publication Critical patent/WO2008085692A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/182—Cable junctions protected by sleeves, e.g. for communication cable held in expanded condition in radial direction prior to installation

Definitions

  • the present invention relates to cable clamping hardware installed in a state housed in a protective cover in the air, underground, in a trough, etc. and clamping cables to be connected with each other and a cable connection box having the same.
  • Patent Document 1 In general, as an example of cable clamping hardware for clamping a cable for splicing cables or for connecting a branch line split off from a main line to another cable, there is the one disclosed in Patent Document 1, which corresponds to Japanese Patent Publication (A) No. 2001-249232.
  • Each cable disclosed in this document is an optical fiber cable provided with a fiber core, one or two tension members, and an external sheath protecting the fiber core and tension member.
  • Each cable is normally treated at its end to peel off the external sheath and expose the fiber core and tension member, then is clamped by the cable clamping hardware to be connected.
  • the cable clamping hardware is a member for clamping a cable in a closure serving as a protective cover so as to maintain the electrical connection state of cables. It has parts clamping a tension member in the front and rear in the axial direction of the cable and a part clamping the external sheath.
  • the part clamping the external sheath is provided with a pair of top and bottom clamp members clamping the external sheath at the two sides in the diametrical direction.
  • Patent Document 2 which corresponds to Japanese Patent Publication (A) No. 7-111724.
  • the cable clamping hardware disclosed in this document is provided with three clamp members arranged at equal intervals in the circumferential direction of a cable and clamping the cable from the diametrical direction and a winding band wound around the outside of the cable and clamp members to make the clamp members abut against the outer circumference of the cable.
  • the clamp members have pushing parts abutting against the outer circumference of the cable.
  • the abutting surfaces of the pushing parts abutting against the outer circumference of the cable are formed with large numbers of projections biting into the outer circumference of a large cable (external sheath).
  • FIG. 8 is a cross-sectional view along the axial perpendicular direction at a position of the cable clamping hardware in the metal cable connection box 100 shown in FIG. 7.
  • one cable 101 in the closure 102 is clamped between bolts 104 serving as a pair of clamp members provided at the cable clamping hardware 103 so as to be arranged at the center of the split structure cable clamping hardware 103.
  • each cable is clamped by a plurality of clamp members 104 arranged at rotationally symmetrical positions at the outside of the diametrical direction, since the cable clamping hardware 103 including the clamp members 104 is arranged in the ring shaped space between the closure 102 and the cable 101, there was the problem that extra empty space cannot be left around the cable 102.
  • the clamping hardware 103 itself is not structured to clamp a plurality of cables, so when clamping a plurality of cables, if arranging a plurality of clamping hardware in parallel, there was the problem that extra space would be required for arranging screws and other fastening members for fastening the clamping hardware between the adjoining cables. For this reason, even when it becomes necessary to increase the number of cables, the number of cables cannot be increased. Unless adding another new closure 102, it was not possible to handle an increase in cables 101. This means that there was low flexibility in increasing or changing cables for a target zone and that expansion or changes in communication lines could not be flexibly handled.
  • a single cable 101 was centered among a plurality of clamp members 104.
  • clamp members 104 were made to move to the inside in the diametrical direction by fastening screws, a band, etc.
  • a plurality of clamp members 104 clamped a single cable 101, so there was the problem that time was taken for the work for clamping (fastening) the cable 101. If a cable 101 has kinks, the kinks in the cable 101 have to be straightened out and while fastening the screws, band, etc. by a predetermined strength. The work of clamping the cable 101 was therefore not easy.
  • the present invention has as its object the provision of cable clamping hardware able to reduce the space for clamping a cable and thereby enabling increases in the number of cables to be flexibly handled and a cable connection box having the same.
  • the present invention has as its object the provision of cable clamping hardware enabling the efficiency of cable clamping work to be improved and a cable connection box having the same.
  • the cable clamping hardware described herein is a cable clamping hardware provided with, inside a protective cover protecting a cable splice, a plate-shaped base supporting cables and fastened to said protective cover and clamps provided at said base and clamping said cables with said base, characterized in that each clamp is provided with a support point supported at said base in a pivotable state, a working part clamping a cable with said base at an opposite side from said support point, and an action point functioning as a fulcrum and receiving external force for making said working part operate.
  • each said clamp is provided with a cable insertion part forming with said base a cable space for passing another cable adjoining said clamped cable and each said clamp straddles two cables parallel with each other comprised of said cable clamped by said clamp and said cable passed through said cable space.
  • An aspect of the invention as described herein is cable clamping hardware as set forth above characterized in that one of said clamps is provided with a support point, another of said clamps is provided with a working part functioning as a free end, an action point is provided between said support point and said working part, and a cable insertion part is formed between said action point and said support point.
  • An aspect of the invention as described herein is cable clamping hardware as set forth above, characterized in that an inside surface of each said working part is provided vertically sticking out from it with a position limiting stopper abutting against said base and limiting the facing distance of said working part and said base.
  • An aspect of the invention as described herein is cable clamping hardware as set forth above characterized in that a front end of said position limiting stopper is formed with a guide part extending out from it and said base is formed with a guide hole guiding and receiving said guide part.
  • An aspect of the invention as described herein is cable clamping hardware as set forth above characterized in that said at least one clamping surface of said base and said working part clamping said cable is a spiked surface stopping slip of the clamped cable.
  • An aspect of the invention as described herein is cable clamping hardware as set forth above characterized in that said base is provided with a pair of support plates arranged facing each other in an axial direction of said cables and supporting said cables and a pair of joint bars arranged facing each other in a diametrical direction of said cables and linking said pair of support plates together.
  • An aspect of the invention of the cable splice connection box as described herein is provided with a protective cover protecting a cable splice and cable clamping hardware as set forth above for clamping cables in said protective cover.
  • each clamp for clamping a cable with the base is provided with a support point supported at the base in a pivotable state, a working part for clamping a cable with the base at an opposite side of support point, and an action point receiving external force for making working part operate, so for example when using a single mounting bolt or other fastening means to mount a clamp to the base, by applying the axial force of the mounting bolt to the action point of the clamp, the clamp pivots about the support point as a fulcrum, the working part moves in a direction approaching the base to narrow the space between the working part and base, and the cable is clamped between the working part and the base.
  • the action point is provided between the support point and the working part, so the left-right balance of the cable clamping hardware becomes good, a cable is reliably clamped without unintentional detachment, and the work efficiency when clamping a cable is improved. Since a working part and support point are provided at the two sides of the action point, by mounting the clamp to the base changed in direction by 180°, two parallel cables can be individually clamped. Further, a cable insertion part is provided near the support point, and the working part is provided at a position away from the support point, so the cable are easily clamped between the base and working part and the work efficiency is improved.
  • each working part is provided with a position limiting stopper projecting out from it vertically, so when force is applied to the action point, the front end of the position limiting stopper abuts against the base, whereby the facing distance between the working part and the base is limited to a predetermined distance, more than necessarily strong clamping of a cable between the base and working part is prevented, and cable damage is avoided.
  • each position limiting stopper is formed with a guide part extending outward for insertion in a guide hole of the base, so when applying force to an action point of a clamp to clamp a cable between the working part and base, the guide part is guided into the guide hole, whereby looseness of the clamp is prevented and the efficiency of cable clamping work is improved.
  • At least one clamping surface of the base and working part is a spiked surface, so a clamped cable is prevented from slipping by the spiked surface and unintentional detachment of a cable from the cable clamping hardware can be prevented.
  • the base is provided with a pair of support plates and a pair of joint bars linking the pair of support plates, so, for example, it is possible to splice a pair of cables in the state with each of the pair of cables to be electrically connected clamped by individual support plates and clamps and therefore the work efficiency is improved. Further, by clamping positions of a cable at two locations by a pair of support plates and clamps, the connection work can be performed while correcting kinks of the cables.
  • FIG. 1 is a perspective view showing an embodiment of a cable connection box according to the present invention.
  • FIG. 2 is a plan view of cable clamping hardware of a cable connection box shown in FIG. 1.
  • FIG. 3 is a plan view showing one support plate of the cable clamping hardware shown in FIG. 2.
  • FIG. 4 is a cross-sectional view along the line A-A of the support plate of FIG. 3.
  • FIG. 5 is a cross-sectional view along the line B-B of the support plate of FIG. 3.
  • FIG. 6 are views showing a clamp, wherein (a) is a front view, (b) is a plan view, and (c) is a side view.
  • FIG. 7 is a plan view showing an example of a conventional cable connection box.
  • FIG. 8 is a cross-sectional view along the line A-A of the cable connection box of
  • FIG. 1 shows an embodiment of a cable connection box according to the present invention.
  • the cable connection box 1 of the present embodiment is comprised of cable clamping hardware 15 for clamping a set of four signal cables 2 to be spliced together and a cable closure (cable protective cover) 5 for protecting the cable splices 4c and the cable clamping hardware 15.
  • the set of four signal cables 2, for example, are cut in advance to predetermined lengths so have the same lengths and having the same diameters. By connecting these, a cable is extended in length.
  • a mode of connection other than connection for extension as modes of connection of a signal cable, for example, it is also possible to split off a branch line from a main line of a cable in a closure 5 and splice it to a cable including a telephone line laid inside a building.
  • Each signal cable 2 is comprised of 50 pairs of conductors each comprised of a signal line 3 a and a ground line 3b and an external sheath formed by an insulative plastic having flexibility for protecting these conductors.
  • a cable of a diameter of about 15 mm is used.
  • each signal cable 2 is stripped of the external sheath to a predetermined length (end treated) to expose the signal lines 3 a and ground lines 3b, then another signal cable 2 is connected to by for example fitting together a male connector 4a and female connector 4b.
  • a male connector 4a and female connector 4b is also possible to use an optical fiber cable having fiber cores.
  • the cable closure 5 is made of plastic and has a split top cover 6 and bottom cover 7 connected by a hinge part 8 at one side.
  • the top cover 6 and the bottom cover 7 are designed so that one side opens pivoting about one hinge part 8 so that the cable clamping hardware 15 can be attached from the open side.
  • the cable clamping hardware 15 is housed in the cable closure 5. In that state, the two end openings of the cable closure 5 are sealed by disk- shaped water caps 11, 12 provided at the two ends of the base 16. The top cover 6 and the bottom cover 7 are closed after the cable clamping hardware 15 is attached.
  • Lock members 13 a, 13b provided at two locations in the front and rear in the long direction of the top cover 6 are engaged with engagement parts 14a, 14b provided at the bottom cover 7 at positions corresponding to these lock members 13a, 13b, whereby the locked state of the covers 6, 7 is held.
  • the cable clamping hardware 15 is provided with a frame-shaped base 16 and a large number of clamps 17 clamping cables 2 with the base 16 at the two ends of the base 16.
  • the base 16 is comprised of a pair of support plates 19, 20 facing each other in the long direction of the cable 2 and a pair of joint bars 21, 22 arranged in parallel with the cables 2 and linking the pair of support plates 19, 20.
  • the pair of support plates 19, 20 and the pair of joint bars 21, 22 are both made of a metal material and are used assembled together in a frame shape.
  • the region inside the thus assembled base 16 is used as the region for connection of cables 1. As shown in FIG.
  • the support plate 19 is comprised of a rectangular plate-shaped plate body 23, a pair of arm parts 24, 25 sticking out in the same direction from the two sides of the plate body 23, and a mounting piece 27 vertically provided on the arm part 24 positioned above.
  • the plate body 23 is formed as a part clamping four cables 2 arranged in parallel together with the clamps 17. There is no need to clamp four cables 2, but the plate body 23 of the present embodiment is formed so as to be able to clamp four cables 2 at a maximum.
  • the positions on the plate body 23 where the cables 2 are clamped with the clamps 17 are positions corresponding to the working parts 36 of the clamps 17 mounted straddling two cables 2, 2.
  • the positions of the working parts 36 of the clamps 17 differ with each adjoining cable 2. That is, the clamps 17 mounted on the line A-A of FIG. 3 are arranged in a line in the same direction, while the clamps 17 mounted on the line B-B are arranged in a line changed 180° in direction from the clamps 17 mounted on the line A-A.
  • the different clamping positions are provided with antislip pieces 28 having top spiked surfaces 28a.
  • Each antislip piece 28 has engagement tabs 28b at the two sides of the spiked surface 28a. These engagement tabs 28b are inserted in the plate body 23 from holes 29. By bending the front ends inward at the rear side of the plate body 23 (see FIGS. 4 and 5), the plate body 23 is attached thereto.
  • the plate body 23 is provided with threaded holes 30 formed as threads for engagement with the male threads of mounting bolts 42 for attaching the clamps 17 by the mounting bolts 42, support pieces 31 formed straddling the threaded holes 30 and sticking up at the opposite sides of the clamping positions and abutting against the support points of the clamps 17 at their front ends, and guide holes 32 formed straddling the clamping positions at the opposite sides of the threaded holes 30 and into which guide parts 44 of the clamps 17 are inserted.
  • the top and bottom arm parts 24, 25 have the joint bars 21, 22 separate from the support plates 19, 20 fastened to them by screws. At the edges of the top and bottom arm parts 24, 25, projecting pieces 26 having threaded holes 26a are provided at positions of two locations.
  • the mounting piece 27 vertically provided on the top arm part 24 has a mounting hole 27a. This mounting hole 27a is locked with a not shown lock part provided at an inside wall of the not cable closure 5, whereby the frame-shaped base 16 is fastened to the cable closure 5.
  • Each clamp 17 is provided with a support point 35 supported by the support plate 19 in a pivotable state at one side, a working part 36 functioning as a free end and clamping a cable 12 with the base 16 at the other side, and an action point 39 provided between the support point 35 and working part 36 and functioning as a fulcrum receiving external force for making the working part 36 operate.
  • the working part 36 operates by the above principle whereby the cable 2 is clamped between the base 16 and working part 36. That is, the clamp 17 according to the present invention is configured with the support point 35 and the action point 39 provided at positions away from each other. Further, between each action point 39 and support point 35, there is a cable insertion part 40 forming a cable space 41 for passing another cable 2 adjoining the clamped cable 2.
  • Each clamp 17 is mounted to the support plate 19 so as to straddle the two parallel cables 2, 2 of the cable 2 clamped by the clamp 17 and the cable 2 passed through the cable insertion part 40.
  • the mounting bolt 42 provided at the action point 39 is used.
  • the clamp 17 of the present embodiment has an action point 39 arranged between the working part 36 and the support point 35 and has a working part 36 provided at the free end side of the clamp 17, so the clamp 17 can be attached by a single mounting bolt
  • each working part 36 is provided with an antislip piece 38 having a spiked surface 38a.
  • the antislip piece 38 is similar to the antislip piece 28 provided at the plate body 23.
  • the spiked surface 38a has engagement tabs 38b at its two sides.
  • the engagement tabs 38b are bent inward from the inside surface of the working part 36 along the outside surface, whereby the piece is attached to the working part 36.
  • the front end of each working part 36 is provided with, vertically projecting from it, a position limiting stopper 43 abutting against the surface of the base 16 and limiting the facing distance between the working part 36 and base 16.
  • each position limiting stopper 43 is formed along its direction of extension with a guide part 44 extending outward for insertion into a guide hole 32 formed in the support plate 19.
  • the guide part 44 is formed narrower than the position limiting stopper
  • the cable insertion part 40 is a part formed by the arch shaped wall part at the opposite side from the working part 36 across the mounting bolt 42 and forms the cable space 41 with the base 16.
  • the formed cable space 41 is formed as a space larger than the thickness of the cable 2, so when mounting a clamp 17 on the support plate 19, a cable 2 can be inserted through the cable space 41 without interference. For this reason, each clamp 17 can be mounted straddling two parallel cables 2, 2. Two clamps 17, 17 mounted straddling two cables 2, 2 are mounted so that the working parts 36 of their clamps 17 are offset.
  • Cables 2 are clamped between the base 16 and the clamps 17 as follows: Two cables 2, 2 are provisionally clamped on support plates 19, 20 of a base 16 assembled into a frame shape in advance by two front and rear clamps 17, 17. In this provisional clamping, in the state with the cables 2, 2 laid at predetermined positions of the support plates 19, 20, the clamps 17 are mounted offset on the support plate 19 from above the cables 2, 2 using the mounting bolts 42.
  • the clamped one of the cables 2, 2 is arranged so as not to be detached in the space formed by the working part 36, the base 16, the mounting bolt 42, and the position limiting stopper 34, while the other nonclamped cable 2 adjoining that cable 2 is inserted through the cable space 31 between the cable insertion part 40 and the base 16.
  • the mounting bolts 42 are strongly fastened to clamp the cables 2 in earnest. If strongly fastening the mounting bolts 42, a downward bolt axial force is applied to the action points 39 of the clamps 17, the support points 35 of the clamps 17 abut against the front ends of the support pieces 31 formed rising up from the support plate 19, and, in the state with the support points 35 supported by the support pieces 31, the working parts 36 move in a direction clamping the cables 2 with the base 16. That is, the cables 2 are clamped by the working parts 36 of the clamps 17 moving by this principle and the base 16 by fastening the single mounting bolts 42.
  • the clamping forces of the cables 2 are limited by the stopper surfaces 43 a of the position limiting stoppers 43 abutting against the surface of the base 16, whereby the cables 2 are clamped by a constant force without being excessively clamped.
  • the signal lines 3 a and ground lines 3b of the cables 2 are connected to the signal lines 3 a and ground lines 3b of the opposing cables 2 by connectors.
  • the cable clamping hardware 15 is enclosed inside the cable closure 5.
  • each clamp 17 is attached to the support plate 19 in the state straddling two cables 2, 2, but it can also be attached in the case where there is only one cable 2. In this case, another cable 2 can be clamped at the time of increasing capacity.
  • the action point 39 is arranged between the working part 36 and the support point 35, but the working part 36 may also be arranged between the action point 39 and the support point 35 and the action point 35 may be arranged at the opposite side of the support point 36.
  • each clamp 17 can be attached to the support plate 19 using a single mounting bolt 42.
  • each clamp 17 is designed to be supported by abutting against the front end of a support piece 31 formed rising up from the support plate 19, but the support point 35 can also be connected through a pin etc. to the support plate 19 or connected by a hinge.
  • each support piece 31 supports the support point 35 of a clamp 17 at its top surface (front end) and is designed so that a downward force (force toward base 16) is transmitted to the support piece 31, but it is also possible to provide an opening (hole) in the support piece, insert into the opening the support point of the clamp, and have an upward force (force for upward separation from the base 16) act on the support piece.
  • This configuration is particularly effective when arranging the working part between the support point and the action point.
  • a location corresponding to the cable insertion part 40 of the embodiment need not be provided.
  • the invention may be configured with the clamp 17 straddling only the cables 2 to be held. When configured in this way, it is necessary to arrange the stopper part (corresponding to position limiting stopper 43) near the mounting bolt of the action point. That much more space becomes required around the cable.
  • the antislip pieces 28, 38 having the spiked surfaces 28a were later attached to the base plate 19 and the clamps 17, but the spiked surfaces may also be formed integrally with the base plate and clamps. Further, the spiked surfaces may be provided with triangular shape teeth sticking out, with a plurality of grooves perpendicular to the axial direction of the cables, or with columnar or cylindrical projections sticking out.

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  • Installation Of Indoor Wiring (AREA)
  • Cable Accessories (AREA)

Abstract

La présente invention concerne un mécanisme serre-câble permettant de réduire l'espace nécessaire pour enserrer des câbles et ainsi de gérer de manière flexible toute augmentation du nombre de câbles. L'invention concerne également un boîtier de connexion de câbles comprenant ledit mécanisme. Le mécanisme serre-câble (15) comprend, à l'intérieur d'une fermeture de câble protégeant l'épissure (4c) des câbles (2), une base en forme de plaque (16) présentant une plaque de support (19) qui sert de support à des câbles et est fixée à la fermeture de câble, et des serre-câbles (17) qui sont disposés sur la plaque de support (19) et enserrent les câbles (2) avec la plaque de support (19), chaque serre-câble (17) étant doté d'un point de support prenant appui sur la plaque de support (19) dans un état pivotant, d'une partie active qui enserre un câble (2) avec la plaque de support (19) sur un côté opposé au point de support, et d'un point d'action qui sert de point d'articulation et reçoit une force externe destinée à faire fonctionner la partie active.
PCT/US2007/088324 2007-01-10 2007-12-20 Mécanisme serre-câble et boîtier de connexion de câbles le comprenant WO2008085692A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007002168A JP2008172883A (ja) 2007-01-10 2007-01-10 ケーブル把持金具及びそれを有するケーブル接続箱
JP2007-002168 2007-01-10

Publications (1)

Publication Number Publication Date
WO2008085692A1 true WO2008085692A1 (fr) 2008-07-17

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PCT/US2007/088324 WO2008085692A1 (fr) 2007-01-10 2007-12-20 Mécanisme serre-câble et boîtier de connexion de câbles le comprenant

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WO (1) WO2008085692A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011092080A1 (fr) * 2010-01-29 2011-08-04 Tyco Electronics Raychem Bvba Dispositif d'étanchéité et de retenue de câbles, et raccordement de câbles
US9671569B2 (en) 2010-01-29 2017-06-06 CommScope Connectivity Belgium BVBA Cable sealing device, cable termination and attaching device
CN112271656A (zh) * 2020-10-31 2021-01-26 贵州电网有限责任公司 一种交联架空绝缘导线拉力恢复连接线夹

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1173914B1 (fr) * 1999-04-26 2003-03-12 Tyco Electronics Raychem NV Boitier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1173914B1 (fr) * 1999-04-26 2003-03-12 Tyco Electronics Raychem NV Boitier
US6797878B1 (en) * 1999-04-26 2004-09-28 Tyco Electronics Raychem Nv Closure casing

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011092080A1 (fr) * 2010-01-29 2011-08-04 Tyco Electronics Raychem Bvba Dispositif d'étanchéité et de retenue de câbles, et raccordement de câbles
EP2355285A1 (fr) * 2010-01-29 2011-08-10 Tyco Electronics Raychem BVBA Dispositif de rétention et d'étanchéité de câble et raccordement de câble
US9671569B2 (en) 2010-01-29 2017-06-06 CommScope Connectivity Belgium BVBA Cable sealing device, cable termination and attaching device
US10061091B2 (en) 2010-01-29 2018-08-28 CommScope Connectivity Belgium BVBA Cable sealing device, cable termination and attaching device
US10613278B2 (en) 2010-01-29 2020-04-07 CommScope Connectivity Belgium BVBA Cable sealing device, cable termination and attaching device
US11550105B2 (en) 2010-01-29 2023-01-10 CommScope Connectivity Belgium BVBA Fiber plug connector with seal and threaded region
CN112271656A (zh) * 2020-10-31 2021-01-26 贵州电网有限责任公司 一种交联架空绝缘导线拉力恢复连接线夹
CN112271656B (zh) * 2020-10-31 2022-04-01 贵州电网有限责任公司 一种交联架空绝缘导线拉力恢复连接线夹

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