JP5389142B2 - Overhead wire impact load relaxation device - Google Patents

Description

  The present invention relates to an impact load relaxation device for an overhead wire, and more particularly to an impact load relaxation device for an overhead wire that prevents breakage of the overhead wire due to an impact load applied to the overhead wire and breakage of the overhead wire gripping portion and the fixing portion.

  The overhead wire stretched between the steel tower and the power pole is, for example, held and fixed to a retaining clamp and is fastened to the steel tower or the power pole via an insulator or the like. Such overhead wires stretched between steel towers and utility poles are subject to abnormal shock loads due to strong vibrations and increased tension due to strong winds and snow, etc., such as excessive tension, disconnection of overhead wires, retention clamps, insulators, etc. There is concern about damage.

  As countermeasures, various impact load relaxation devices that are interposed between the tension clamp and the insulator and relieve the impact load have been proposed. For example, Patent Document 1 is an example of this type of impact load reducing device.

  As shown in the sectional view of FIG. 11A and the plan view of FIG. 11B, the impact load reducing device of Patent Document 1 includes a first support fitting 101 and a first support fitting 101 each having an elongated rectangular plate shape. Two second support fittings 111 arranged on both side surfaces are provided. The first support fitting 101 is provided with a connecting hole 102 that is connected to a retention clamp by a cotter or the like on one end side, and a linear long hole 103 that extends from the center to the other end. On the other hand, the two second support fittings 111 arranged so as to sandwich the first support fitting 101 from both side surfaces and be shifted in the longitudinal direction which is the tension direction F are formed on the first support fitting 101 on one end side. Pin insertion holes 113 and 114 facing the respective end portions 103a and 103b of the long hole 103 are formed, and a connection hole 112 connected to the lever by a cotter or the like is formed on the other end side.

  Each of the first support fitting 101 and the pin 122 passing through the long hole 103 of the first support fitting 101, the pin insertion hole 113 of each second support fitting 111, and the pin 122 passing through the long hole 103 and each pin insertion hole 114, The impact load reducing device 100 is configured by integrating the second support fitting 111.

  In the normal state, the impact load reducing device 100 interposed along the tension direction F between the tension clamp and the insulator is inserted into the long hole 103 of the first support fitting 101 and the pin of each second support fitting 111. A pin 121 passing through the hole 113 abuts on the end 103a of the long hole 103 to maintain the tension of the overhead wire.

  On the other hand, when a large impact load exceeding a predetermined value, that is, excessive tension is applied to the overhead wire, the impact load P acts on the first support bracket 101 via the retention clamp, and the first support bracket 101 and the second support bracket move relative to each other. The first support fitting 101 and the second support fitting 111 are moved relative to each other in the tension direction F by breaking, that is, shearing, the pin 121 with the fitting 111. As a result, as shown in FIG. 11C, the pin 122 penetrating the long hole 103 of the first support fitting 101 and the pin insertion hole 113 of the second support fitting 111 moves in the long hole 103 and the pin 121 is broken. The intermediate member 121a moves in the long hole 103, the intermediate member 121a is sandwiched between the intermediate member 121a and the pin 122, and the first support fitting 101 and the second support fitting 111 are stopped. Hold. As a result, the slackness of the overhead wire is increased by the amount of relative movement between the first support fitting 101 and the second support fitting 111, and the tension is reduced by that amount, thereby avoiding disconnection of the overhead wire, breakage of the tension clamp or insulator, etc. The

Japanese Unexamined Patent Publication No. 2009-23551

  According to the impact load reducing device 100 of Patent Document 1, the pin 121 is moved between the first support fitting 101 and the second support fitting 111 that move relative to each other due to an increase in the tension of the overhead wire when a large impact load of a predetermined level or more is applied to the overhead wire. The increase in the tension of the overhead wire is reduced by the first support metal fitting 101 and the second support metal fitting 111 that are further broken and moved relatively in the tension direction F to avoid breakage of the overhead wire, breakage of the tension clamp or the insulator.

  However, in order to shear the pin 121 with the first support fitting 101 and the second support fitting 111 that move relative to each other, the interval between the first support fitting 101 and the second support fitting 111 must be appropriately maintained, Its management is extremely difficult. That is, if the distance between the first support fitting 101 and the second support fitting 111 is too small, the frictional resistance between the first support fitting 101 and the second support fitting 111 becomes large, and the first support fitting 101 If the distance between the second support fitting 111 is too large, good shear stress on the pin 121 cannot be obtained, and the relative movement between the first support fitting 101 and the second support fitting 111 is hindered, and the impact load reducing device 100 is located. The function of the period may not be achieved.

  In addition, with the lapse of a long period of time, the first support fitting 101 and the second support fitting 101 and the second support fitting 101 and the second support fitting 111 are caused by rusting or wear due to intrusion of rainwater, salt water, and dust containing sand dust. There is also a concern that the gap between the support fitting 111 may change and affect the function of the impact load relaxation device 100.

  Further, when changing the impact load relaxation characteristics due to a specification change or the like, if the diameter of the pin 121 is changed, the long hole 103 of the first support fitting 101 or the pin insertion hole 113 needs to be changed along with the change of the pin 121. Therefore, many of the first support fitting 101 and the second support fitting 111 must be changed, and it is difficult to change the setting.

  Accordingly, an object of the present invention, which has been made in view of the above points, is to provide an impact load mitigation device for an overhead wire that can secure good impact mitigation characteristics over a long period of time with a simple configuration and can simplify management and maintenance.

  An impact load reducing device for an overhead wire according to claim 1 that achieves the above object, wherein both ends of the overhead wire gripping portion and the fixing portion are coupled to each other and are interposed between the overhead wire gripping portion and the fixing portion. An impact load relaxation device for an overhead wire that retains a tension at which the fixing portion separates and relaxes an impact, the plate-like first support fitting having an end portion connected to one of the overhead wire gripping portion or the fixing portion, A pin shaft that is held by the first support fitting and protrudes from both side surfaces of the first support fitting, and an end portion is connected to the other of the overhead wire gripping portion and the fixing portion, and arranged on both surfaces of the first support fitting. Two second support fittings that are formed in a plate shape and have a long hole that penetrates the pin shaft and allows movement in the tension direction, and are fixed to both sides of the second support fitting with the long hole therebetween. Both ends are supported by a pair of locking pins and are installed between the locking pins. And a shaft holding fitting for restricting the movement of the pin shaft, and the pin shaft abuts against the shaft holding fitting to restrict the relative movement of the first support fitting and the second support fitting, while the impact load exceeds a predetermined value. The pin shaft breaks the shaft holding bracket by the relative movement of the first support bracket and the second support bracket, and the pin shaft abuts against the end of the long hole and stops.

  According to this, in a normal state, the pin shaft provided in the first support fitting comes into contact with the shaft holding fitting supported by the second support fitting and the relative movement of the first support fitting and the second support fitting is prevented, and the overhead wire Holds the tension of the overhead wire gripped by the gripping part. On the other hand, when an impact load exceeding a predetermined value, that is, excessive tension is applied, the pin shaft breaks the shaft holding bracket by the first support bracket and each second support bracket that move relative to the impact load, and the impact is generated. While the load is absorbed and reduced, the first support fitting and the second support fitting are further moved relative to each other in the extending direction to weaken the tension, and the pin shaft comes into contact with the end portion of the long hole to stop the movement. As a result, the slackness of the overhead wire is increased by the relative movement of the first support fitting and the second support fitting, and the tension is reduced by that amount to avoid breakage of the overhead wire, breakage of the overhead wire gripping portion, fixing portion, etc. . Further, the broken shaft holding metal parts, that is, the respective fragments are held on the second support metal parts by the locking pins to prevent the falling.

  Further, the breaking force required to break the shaft holding bracket erected and supported by the second support bracket with the pin shaft provided on the first support bracket includes the first support bracket, the second support bracket, the shaft holding bracket, and the like. It is relatively less affected by the assembly accuracy, and the shape and mounting accuracy of the first support bracket, the second support bracket, the shaft holding bracket, etc. are relaxed, and each component can be simplified. With the configuration, it is possible to ensure reliable impact relaxation over a long period of time, and simplify management and maintenance such as maintenance.

  In addition, when changing the impact load relaxation characteristics due to specification changes, etc., it is possible to cope with simple changes such as changing the shape of the shaft holding bracket according to the specification change. It can be applied to various specifications without changing the metal fittings and pin shafts, and has excellent versatility.

  According to a second aspect of the present invention, in the overhead wire impact load reducing device according to the first aspect, the elongated hole of the second support fitting is opposite between both ends of the first end and the second end in the tension direction. Are connected by a guide portion having a pair of side surfaces, and the shaft holding member holds the pin shaft at the first end portion of the elongated hole, while the first support fitting and the second support fitting are moved relative to each other by a predetermined impact load. The pin shaft breaks the shaft holding bracket and moves along the guide portion so as to come into contact with the second end portion and stop.

  The second aspect of the present invention is a specific configuration such as a long hole formed in the second support bracket and a shaft holding bracket, and the pin shaft provided in the first support bracket is normally connected to the second support bracket by a locking pin. The pin shaft is held at the first end portion of the long hole by abutting against the shaft holding fitting supported at both ends. On the other hand, when an excessive impact load acts on the overhead wire or the like, the pin shaft breaks the shaft holding bracket due to the impact load to reduce the impact load, and further, the first support bracket and the second support bracket apply tension. The pin shaft comes into contact with the second end portion and stops by holding the tension of the overhead wire by moving relative to the weakening extension direction to reduce the tension.

  According to a third aspect of the present invention, the overhead wire impact load reducing device according to the second aspect is characterized in that the guide portion is provided with an impact attenuating means that abuts against the pin shaft to attenuate the impact.

  According to this, since the pin shaft moves while attenuating the impact load by the impact attenuating means formed on the guide portion and comes into contact with the second end portion to stop the movement, it is efficient in addition to the first embodiment. Thus, the shock load is attenuated, and the breakage of the overhead wire, the shock load buffering device, the overhead wire gripping portion, the fixing portion, and the like can be avoided more reliably.

  According to a fourth aspect of the present invention, in the impact load reducing device for an overhead wire according to the third aspect, the impact attenuating means is a plurality of protrusions formed on a side surface of the guide portion. According to this, when the impact damping means is constituted by a plurality of protrusions formed on the side surface of the guide portion, the pin shaft can move to the side surface of the guide portion when the first support bracket and the second support bracket move relative to each other in the extending direction. The pressing load that is latched by the protrusions formed on the metal plate is repeated, so that the impact load can be attenuated efficiently.

  According to a fifth aspect of the present invention, in the overhead wire impact load alleviating device according to any one of the first to fourth aspects, the shaft holding fitting is a contact portion between the locking pins and the pin shaft. It has a fragile part. According to this, by forming the fragile portion in the abutting portion of the shaft holding fitting with which the pin shaft abuts, the shaft holding fitting can be reliably broken at the portion.

  According to a sixth aspect of the present invention, in the overhead wire impact load alleviating device according to any one of the first to fifth aspects, each of the locking pins swings the shaft holding bracket relative to the second support bracket. The support is possible.

  According to this, by supporting the shaft holding metal fitting so as to be swingable by the locking pin, the broken shaft holding metal piece, that is, the fractional piece, is securely held by the second support metal fitting and can be prevented from falling.

  A seventh aspect of the present invention is the overhead wire impact load alleviating device according to any one of the first to sixth aspects, wherein the pair of second support fittings are integrally connected at the ends. And

  According to this, by forming the second support fittings disposed on both surfaces of the first support fitting integrally, the constituent members of the impact load reducing device can be reduced, and the configuration can be simplified. The distance between the support brackets is kept constant, and the mutual position such as the distance between the first support bracket and each second support bracket is kept constant, so that stable impact load relaxation characteristics can be obtained.

  According to the present invention, the pin shaft provided on the first support fitting normally contacts the shaft support fitting supported at both ends by the locking pins on the second support fitting, so that the first support fitting and the second support fitting The relative movement is restricted, and the tension of the overhead wire gripped by the overhead wire gripping portion is maintained. On the other hand, when an impact load of a predetermined level or more is applied, the pin support shaft breaks the shaft holding bracket and reduces the impact load by the first support bracket and the second support brackets that move relatively with the impact load. Further, the first support fitting and the second support fitting move relative to each other in the extending direction to reduce the tension, and the pin shaft comes into contact with the end of the elongated hole and the movement stops. As a result, disconnection of the overhead wire, breakage of the overhead wire gripping portion or fixing portion, etc. are avoided.

  In addition, since the shaft support fitting that is installed and supported on the second support fitting by the locking pin is broken by the pin shaft provided on the first support fitting to reduce the impact, the first support fitting, the second support fitting, The shape and assembly accuracy of the shaft support bracket, etc., hardly affect the breaking action of the shaft support bracket, making it possible to suppress these precisions and ensure reliable impact relaxation over a long period of time with a simple configuration. At the same time, management and maintenance such as maintenance can be simplified.

It is a perspective view which shows the impact load relaxation apparatus of the overhead wire which concerns on 1st Embodiment of this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is the sectional view on the AA line of FIG. It is a B arrow view used as the top view of FIG. It is a figure which shows the use condition of an impact load relaxation apparatus. It is sectional drawing which shows the effect | action of an impact load relaxation apparatus. It is C arrow perspective view of FIG. It is a disassembled perspective view of the impact load relaxation apparatus which concerns on 2nd Embodiment. It is the DD sectional view taken on the line of FIG. It is a perspective view of the impact load relaxation apparatus which concerns on 3rd Embodiment. It is explanatory drawing of the conventional impact load relaxation apparatus.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an overhead wire impact load reducing device of the present invention will be described below with reference to the drawings.

(First embodiment)
A first embodiment of an overhead wire impact load reducing device according to the present invention will be described with reference to FIGS.

  1 is a perspective view showing an outline of the impact load reducing device 10, FIG. 2 is an exploded perspective view of the impact mild load summing device 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG.

  The impact load reducing device 10 includes a first support fitting 11 made of a metal material such as steel or aluminum, and two second support fittings 21 arranged on both side surfaces of the first support fitting 11. A pin shaft 41 that connects the first support fitting 11 and the second support fitting 21 is provided.

  As shown in FIG. 2, the pin shaft 41 connecting the first support fitting 11 and the second support fitting 21 is larger than the shaft portion 42 at the base portion of the shaft portion 42 having the screw portion 42a formed at the tip and the shaft portion 42. It is a bolt shape having a head portion 43 having a diameter, and has a nut portion 44 that can be screwed into the screw portion 42a.

  The first support fitting 11 is in the form of an elongated rectangular plate, one end of which is a tension clamp serving as an overhead wire gripping portion or a lever serving as a fixing portion, and in this embodiment, a coupling hole for coupling to the tension clamp 2. 12, the shaft insertion hole 13 through which the shaft portion 42 of the pin shaft 41 passes and is press-fitted and held is formed at the other end.

  On the other hand, each of the second support fittings 21 arranged so as to sandwich the first support fitting 11 from both side surfaces and be shifted in the longitudinal direction is an elongated rectangular plate, and has one end portion of the other of the retention clamp or the insulator, In the present embodiment, a connecting hole 22 for connecting to the insulator 6 is formed, and a long hole 25 that is linearly continuous along the longitudinal direction is formed from the center to the other end. The long hole 25 has a first end portion 26 on the center side and a second end portion 27 on the other end side formed in an arc shape into which the shaft portion 42 of the pin shaft 41 can be inserted, and the first end portion 26 and the second end portion. A linear guide portion 28 having side surfaces 28a and 28b facing each other with a distance equal to or slightly larger than the diameter of the shaft portion 42 of the pin shaft 41 is formed. The second support fitting 21 is provided with locking holes 29a and 29b on both sides of the guide hole 28 in the vicinity of the first end 26 of the long hole 25.

  Furthermore, the shaft holding fitting 31 is bridged across the long hole 25 between both sides of the guide portion 28 in the vicinity of the first end portion 26 of the long hole 25 on the side surface of each second support fitting 21. The shaft holding metal 31 is an elongated rectangular plate in which locking pin insertion holes 32a and 32b that are spaced apart from each other corresponding to the locking holes 29a and 29b are formed at both ends, and the longitudinal length of the edge on the first end 26 side. A concave contact portion 33 into which the shaft portion 42 of the pin shaft 41 can be fitted is formed at the center in the direction, and a weak portion 34 having a relatively low rigidity is formed in this portion.

  The shaft holding metal 31 is swingable by the locking pins 36a and 36b that are inserted from the locking pin insertion holes 32a and 32b and inserted into the locking holes 29a and 29b of the second support metal 21 and fixed. It is attached to the second support fitting 21 while being pivotally supported. The locking pins 36a and 36b are preferably fixed so that they do not fall off by being driven into the locking holes 29a and 29b, and a large-diameter head is formed so that the shaft holding fitting 31 does not fall off.

  The shaft portion 42 of the pin shaft 41 can be inserted by the contact portion 33 of the shaft holding bracket 31 attached to the second support bracket 21 and the first end portion 26 of the elongated hole 25, and the head portion 43 and the nut portion 44 can be inserted. An opening having a diameter that prevents insertion is formed.

  Each of the second support fittings 21 to which the first support fitting 11 and the shaft holding fitting 31 configured as described above are attached is arranged such that each shaft holding fitting 31 is on the both sides of the first support fitting 11 and the first support fitting 11 is outside. The first end portions 26 of the long holes 25 of the respective second support fittings 21 face each other and are overlapped with the 11 shaft insertion holes 13.

  In a state where the second support fitting 21 is overlapped on both sides of the first support fitting 11, the first end portion 26 of the long hole 25 formed in one of the second support fittings 21 and the contact portion between the shaft holding fitting 31. The shaft portion 42 of the pin shaft 41 is inserted from the tip through the opening formed by 33, and is press-fitted into the shaft insertion hole 13 of the first support fitting 11 and penetrated to be formed in the other second support fitting 21. The tip end of the shaft portion 42 protrudes from the opening formed by the first end portion 26 of the long hole 25 and the abutting portion 33 of the shaft holding metal fitting 31, and the nut portion 44 is screwed into the screw portion 42a. The support metal fitting 11 and each second support metal fitting 21 are integrated, and the impact load reducing device 10 is configured as shown in a perspective view in FIG. 1, a cross-sectional view in FIG. 3, and a plan view in FIG.

  For example, as shown in FIG. 5, the impact load reducing device 10 has a connecting hole 12 of the first support fitting 11 connected to a clevis portion 2 a of a retaining clamp 2 that holds and fixes the overhead wire 1 by a cotter 3. At the end side of each second support fitting 21, the connection fitting 7 of the insulator 6 connected to the support 5 provided on the utility pole or the like is sandwiched, and each connection hole 22 is connected by the cotter 8 to connect the tension clamp 2 and the insulator 6. It is inserted between. A direction in which the tension clamp 2 and the insulator 6 are separated from each other is a tension direction F.

  When the first support fitting 11 is connected to the tension clamp 2 and the second support fitting 22 is connected to the insulator 6, the impact load reducing device 10 is attached to the first support fitting 11 as shown in FIGS. The shaft portion 42 of the pin shaft 41 that is held and protrudes from both side surfaces abuts on a contact portion 33 that is recessed in the shaft holding bracket 31 provided in each second support bracket 20, and the first support bracket 11 and the first support bracket 11. 2 It is installed between the tension clamp 2 and the insulator 6 in a state where the relative movement in the tension direction F, that is, the extension direction of the support fitting 21 is restricted. As a result, tension is applied between the insulator 6 and the tension clamp 2 by the impact load relaxation device 10, and the overhead wire 1 gripped and fixed to the tension clamp 2 is retained on the steel tower or utility pole via the impact load relaxation device 10, the insulator 6, and the like. And a preset normal tension is maintained.

  On the other hand, when an abnormal impact load, that is, an excessive tension is applied to the overhead wire 1 stretched between the steel tower and the utility pole with a normal tension in this way due to a strong vibration or an increase in tension due to strong wind or snowfall, etc. As shown in FIG. 3, the impact load P acts on the end portion of the first support fitting 11 of the impact load relaxation device 10 via the retention clamp 2. Due to this impact load P, the first support fitting 11 and each second support fitting 21 move relative to each other in the tension direction F, and the shaft portion 42 of the pin shaft 41 supported by the first support fitting 11 is attached to the second support fitting 21. The weakened portion 34 formed at the center in the longitudinal direction of the shaft holding metal 31 is broken by pressing or striking the contact part 33 of the shaft holding metal 31 supported at both ends by the locking pins 36a and 36b. Absorbs and reduces impact load.

  When the pin shaft 41 having broken the central portion of the shaft holding metal 31 moves from the first end 26 side of the elongated hole 25 to the guide portion 28, the divided pieces 31A and 31B of the divided shaft holding metal 31 are The pin pins 41 are pushed apart to swing around the locking pins 36a and 36b. Here, the fraction pieces 31A and 31B are held by the second support fitting 21 by the locking pins 36a and 36b, respectively, and are prevented from dropping from the impact load reducing device 10.

  As shown in FIGS. 6 and 7, the shaft portion 42 of the pin shaft 41 provided in the first support fitting 11 passes through the guide portion 28 from the first end portion 27 side of the long hole 25 of each second support fitting 21. The movement of the first support fitting 11 and the second support fitting 21 in the extending direction, which is in contact with the second end portion 27 and the tension direction F, stops.

  As a result, the slackness of the overhead wire 1 held by the tension clamp 2 increases in accordance with the extension of the first support fitting 11 and the second support fitting 21 in the tension direction F, and the tension decreases accordingly, and the overhead wire 1 is disconnected. In addition, the breakage of the tension clamp 2 or the insulator 6 can be avoided.

  Therefore, in the impact load reducing device 10 according to the present embodiment, the pin shaft 41 provided on the first support fitting 11 is normally held on both ends of the second support fitting 21 by the locking pins 36a and 36b. Abutting on the metal fitting 31, the relative movement of the first support metal 11 and the second support metal 21 is restricted to maintain the tension of the overhead wire 1. On the other hand, when an excessive tension is applied to the overhead wire 1, the shaft holding bracket 31 is supported by the shaft portion 42 of the pin shaft 41 by the first support bracket 11 and each second support bracket 21 that move relatively by the impact load. The first support fitting 11 and the second support fitting 21 are moved relative to each other in the tension direction F in which the tension is weakened, and the pin shaft 41 abuts against the second end 27 to provide the first support. The movement of the metal fitting 11 and the second support metal fitting 21 in the extending direction stops.

  As a result, the slackness of the overhead wire 1 gripped by the tension clamp 2 increases in accordance with the extension of the first support fitting 11 and the second support fitting 21 in the tension direction F. Damage to the tension clamp 2 or the insulator 6 is avoided.

  In addition, the breaking force that breaks the fragile portion 33 of the shaft holding bracket 31 that is supported by the second support bracket 21 by the locking pins 36a and 36b by pressing or striking the pin shaft 41 provided on the first support bracket 11. However, the mutual positional accuracy of the first support bracket 11, the second support bracket 21, the shaft holding bracket 31 and the like hardly affects the breaking action of the shaft support bracket 31. , The shape and assembly accuracy of the second support bracket 21, shaft holding bracket 31, pin shaft 41, etc. can be suppressed, and with a simple configuration, reliable shock relaxation can be secured over a long period of time, and maintenance, etc. Simplify management and maintenance.

  In addition, it can be applied with simple changes such as changing the shape of the shaft holding fitting 31 of the impact load reducing device 1, such as the shape of the plate thickness or the contact portion 33, in accordance with changes in specifications such as required shock load relaxation characteristics. It is possible to meet various specifications without changing the first support bracket 11, the second support bracket 21, the shaft member 41, etc., and has excellent versatility.

(Second Embodiment)
Next, with reference to FIG.8 and FIG.9, 2nd Embodiment of the impact load relaxation apparatus of an overhead wire is described.

  FIG. 8 is an exploded perspective view of the impact load relaxation device 10, and FIG. 9 is a sectional view taken along the line DD of FIG. 8 showing the sectional shape of the second support fitting 21. 8 and 9, the same reference numerals are given to the portions corresponding to those in FIGS. 1 to 7, and detailed description thereof is omitted, and different portions are mainly described.

  As in the first embodiment, the impact load reducing device 10 includes two support brackets 21, a shaft holding bracket 31, and a pin shaft 41 disposed on both sides of the first support bracket 11 and the first support bracket 11. Have. Furthermore, on the side surface of the guide portion 28 of the long hole 25 formed in the second support fitting 21, impact load attenuating means including a plurality of protrusions 30 which are the features of the present embodiment is provided on 28 a and 28 b.

  As shown in FIGS. 8 and 9, the second support fitting 21 provided with the impact load attenuating means has an elongated rectangular plate shape, and has a connecting hole 22 formed at one end thereof, and the other end side from the central portion. The long hole 25 that is continuous in a straight line is formed in an arc shape in which the first end portion 26 on the center side and the second end portion 27 on the other end side can be inserted into the shaft portion 42 of the pin shaft 41. Between the portion 26 and the second end portion 27, there are side surfaces 28 a and 28 b that are opposed to each other with a diameter equal to or slightly larger than the diameter of the shaft portion 42 of the pin shaft 41. A plurality of projections 30 are formed at equal intervals or unequal intervals from the portion 26 side to the second end portion 27 side, and the distance between the top ends of the opposing projections 30 is set smaller than the outer diameter of the shaft portion 42 of the pin shaft 41. The

  According to the impact load reducing device 10 configured as described above, the pin shaft 41 supported by the first support fitting 11 in the normal state is connected to the first end portion 26 of the long hole 25 formed in the second support fitting 21 and the shaft. It protrudes from between the holding metal fittings 31 and comes into contact with the shaft holding metal fitting 31 so that the relative movement between the first support metal fitting 11 and the second support metal fitting 21 is restricted, and the tension of the overhead wire 1 is maintained. On the other hand, when excessive tension is applied to the overhead wire 1, the shaft portion 42 of the pin shaft 41 supported by the first support fitting 11 is attached and supported by the second support fitting 21 by the locking pins 36 a and 36 b. The fragile portion 34 is broken by press-contacting or hitting the shaft-holding metal 31 to reduce the impact load, and the first support metal 11 and the second support metal 21 reduce the tension, and the pin moves with relative movement in the extension direction. The shaft portion 42 of the shaft 41 moves while attenuating the impact load by repeatedly pressing so that the shaft portion 42 is locked to the projections 30 formed on the side surfaces 28 a and 28 b of the guide portion 28, and contacts the second end portion 27. Thus, the movement of the first support fitting 11 and the second support fitting 21 stops.

  Therefore, in addition to the first embodiment, when the excessive tension acts on the overhead wire 1, the impact relaxation by the impact load shock absorber 1 is performed efficiently and smoothly, and the impact load shock absorber 10, the tension clamp 2 or the insulator 6. Thus, the breakage of the overhead wire 1 and the breakage of the tension clamp 2 or the insulator 6 can be avoided more reliably.

  In addition, the size and number of the protrusions 30 can be changed as appropriate according to changes in specifications such as required impact load relaxation characteristics.

(Third embodiment)
Next, a third embodiment of the impact load reducing device will be described with reference to FIG.

  FIG. 10 is a perspective view showing an outline of the impact load relaxation device 10. In FIG. 10, parts corresponding to those in FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The impact load reducing device 10 is formed in an integral block shape by joining the second support fittings 21 arranged on both surfaces of the first support fitting 11 at the ends. In this way, by forming both the second support fittings 21 integrally, in addition to the first embodiment, it is possible to reduce the number of constituent members of the impact load reducing device 10, and the interval between the second support fittings 21 is reduced. It is held constant, the mutual position such as the interval between the first support fitting 11 and each second support fitting 21 is kept constant, and a stable impact load relaxation characteristic can be secured. Similarly to the second embodiment, impact load attenuating means such as protrusions 30 can be applied to the side surfaces 28a, 28b of the guide portion 28 of the long hole 25.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the above embodiment, the impact load attenuating means is configured by the plurality of protrusions 30 formed on the side surfaces 28a and 28b of the guide portion 28 in the elongated hole 25 of the second support fitting 21, but the impact load attenuating means is a pair of impact load attenuating means. The protrusion 30 or the side surfaces 28a and 28b can be formed into a rough surface, or the side surfaces 28a and 28b can be provided with a friction plate or the like.

1 Overhead wire 2 Tension clamp (overhead wire gripping part)
6 Isogo (fixed part)
DESCRIPTION OF SYMBOLS 10 Impact load relaxation apparatus 11 1st support metal fitting 13 Shaft insertion hole 21 2nd support metal fitting 25 Long hole 26 1st edge part 27 2nd edge part 28 Guide part 28a, 28b Side surface 30 Protrusion (impact load attenuation means)
31 Axle holding bracket 33 Abutting part 34 Weak part 36a, 36b Locking pin 41 Pin shaft 42 Shaft part F Tension direction

Claims (7)

Both ends of the overhead wire gripping part and the fixed part are connected to each other, and interposed between the overhead wire gripping part and the fixed part so as to maintain the tension at which the overhead wire gripping part and the fixed part separate from each other, and to reduce the impact load of the overhead wire. A device,
A plate-like first support fitting whose end is connected to one of the overhead wire gripping part or the fixing part;
A pin shaft that is held by the first support fitting and protrudes from both side surfaces of the first support fitting;
A plate-like end is connected to the other of the overhead wire gripping part and the fixed part and arranged on both surfaces of the first support fitting, and a long hole is formed through which the pin shaft penetrates and allows movement in the tension direction. Two second support brackets,
Both ends are supported by a pair of locking pins fixed to both sides of the long hole in the second support fitting, and the shaft is installed between the locking pins and restricts the movement of the pin shaft. Holding brackets,
The pin shaft abuts on the shaft holding bracket and restricts the relative movement of the first support bracket and the second support bracket. On the other hand, the pin shaft is moved by the relative movement of the first support bracket and the second support bracket due to an impact load of a predetermined amount or more. An apparatus for reducing an impact load of an overhead wire, wherein the shaft holding metal is broken and the pin shaft comes into contact with an end of the long hole and stops. The long holes of the second support fittings are connected by a guide portion having a pair of side surfaces facing each other between both ends of the first end portion and the second end portion in the tension direction,
While the pin shaft is held at the first end of the long hole by the shaft holding fitting, the pin shaft breaks the shaft holding fitting by the relative movement of the first support fitting and the second support fitting due to an impact load of a predetermined amount or more. The apparatus according to claim 1, wherein the apparatus is moved along the guide portion and comes into contact with the second end portion to stop.   The apparatus according to claim 2, further comprising impact attenuating means for attenuating impact by abutting the pin shaft on the guide portion.   The apparatus according to claim 3, wherein the impact attenuating means is a plurality of protrusions formed on a side surface of the guide portion.   The said load-holding metal fitting has an fragile part in the contact part with the said pin axis between both locking pins, The impact load relaxation apparatus of the overhead wire of any one of Claims 1-4 characterized by the above-mentioned.   6. The overhead wire impact load reducing device according to claim 1, wherein each of the locking pins supports the shaft holding bracket so as to be swingable with respect to the second support bracket. 7.   The said pair of 2nd support metal fitting was integrally connected in the edge part, The impact load mitigation apparatus of the overhead wire of any one of Claims 1-6 characterized by the above-mentioned.

Images