JP5337940B2 - Tension balancer for overhead wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly prevent tilting of aerial cables accompanying torsion between tubular members due to telescopic motion of the aerial cables. <P>SOLUTION: The tension balancer for the aerial cables includes: a casing 1 provided in a telescopic state; a rod part 4 comprising an middle tube 3 and a pair of opposing long boards 4a, 4a provided in the center part; and compression coil springs 6, 7 biasing the middle tube 3 and the rod part 4 in an immersion direction. The casing 1 is a corner tubular member. The middle tube 3 includes a flange part 3b having an outer diameter shape corresponding to an inner diameter of the casing 1 in an outer periphery. The flange part 3b regulates rotation on an inner peripheral surface of the casing 1 so as to slide. A plate 3a for blocking one end opening is fixed in the middle tube 3. The plate 3a is provided with a hole 3d in a shape corresponding to the outer diameter shape of the rod part 4. The rod part 4 penetrates the hole 3d, and is regulated with rotation in the hole 3d so as to slide. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an overhead wire tension balancer used in equipment for maintaining the tension of a train line.

  For overhead lines, especially train lines (suspended / auxiliary suspended / trolley lines), the slackness is due to expansion / contraction due to temperature change, elastic elongation due to creep and trolley line wear, and inclination of the support over time. Since the tension is affected, it is necessary to keep the tension of the train line constant. In addition, it is desirable to perform the adjustment automatically to make it maintenance-free. For example, as disclosed in Patent Document 1, a plurality of compression coil springs are used, and a cylindrical member is used for further downsizing. A tension balancer in which the springs are concentrically combined and connected in series has been proposed.

  FIG. 19 shows an example of a tension balancer using the above structure. In FIG. 19, an outer middle cylinder 2, an inner middle cylinder 3, and a rod 4 are concentrically received in a cylindrical casing 1 so as to be relatively displaceable in the axial direction. Further, compression coil springs 5, 6 having large, medium, and small diameters are provided between the casing 1 and the outer middle cylinder 2, between the outer middle cylinder 2 and the inner middle cylinder 3, and between the inner middle cylinder 3 and the rod 4, respectively. 7 is installed concentrically. Each compression coil spring 5, 6, 7 is engaged with each inward flange portion 1 a, 2 a, 3 a fixed at one end in the axial direction to the inner peripheral surface of each outer member, and the other end at each inner side The outer flanges 2b, 3b and 4b are fixed to the outer peripheral surface of the member.

  The outer middle cylinder 2, the inner middle cylinder 3 and the rod 4 are received in the casing 1 when assembled, and can protrude rightward in the drawing. The casing 1 is coupled to a support column 16 via a mounting bracket 15 secured to an end plate 1b at the rear end, and a support rope 18 coupled to a perforated bracket 17 secured to the upper surface of the casing 1. It is supported by the support column 16 via. And the end part of the train line 20 as an overhead line is couple | bonded with the overhead wire connection metal fitting 19 attached to the protrusion end of the rod 4 via a insulator and a retention rod part. In the illustrated example of the train line, the suspension line is arranged on the upper side and the trolley line is arranged in parallel on the lower side.

  In the tension balancer thus configured, the compression coil springs 5, 6, 7 are compressed and deformed to some extent under the standard installation conditions, and, for example, as shown in FIG. It is installed in a state where it protrudes by the stroke length that reaches almost the middle position of the working stroke range. Therefore, for example, when the temperature decreases and the train line 20 contracts, the rod 4, the inner middle cylinder 3, and the outer middle cylinder 2 further protrude against the repulsive force of the compression coil springs 5, 6, 7, and the temperature rises. When the train line 20 extends, the rod 4 and the inner middle cylinder 3 and the outer middle cylinder 2 are immersed in the casing 1 by the elastic restoring force of the compression coil springs 5, 6, 7. Displacement due to shrinkage can be absorbed, and the train line 20 can be held in a tensioned state by a stable tension, and has features such as maintenance-free.

  However, in such a tension balancer, the compression coil springs 5, 6, 7 are formed of a simple series combination, and due to the relative circumferential displacement that occurs at the end of each coil when the compression coil springs 5, 6, 7 expand and contract, A “twist” occurs between the outer cylinder (casing) and the innermost cylinder (rod). When the structure of the train line is a parallel line in which a suspension line is arranged on the upper side and a trolley line is arranged on the lower side, there is a problem that the parallel line tilts due to the twist. In order to solve such a problem, for example, there is provided an anti-rotation means provided between the overhead wire connecting member as shown in Patent Document 2 and the outermost cylindrical member.

Japanese Utility Model Publication No. 39-19536 Japanese Patent No. 3477038

  However, the conventional anti-rotation means of the tension balancer is provided with a guide hole with a pair of anti-rotation plates or U-shaped fittings on the inner peripheral surface of the opening end portion of the innermost cylindrical member (rod 4). Since the long plate 24 fixed to the end plate of the outer cylindrical member (casing 1) is inserted into the guide hole, the rod 4 (the overhead wire connecting member is connected) and the casing 1 are used. If a twist occurs between the long plate 24 and the guide hole, the force acts as a contact force in an attempt to prevent the rod from rotating due to the twist, and a frictional resistance is generated. For this reason, there is a problem that the advancement / retraction of the rod, which is influenced by the advancement / retraction of the rod, is obstructed to absorb the displacement due to the expansion / contraction of the train line.

  Further, although drain holes are provided at appropriate positions of the casing 1 and the middle cylinders 2 and 3, the outer middle cylinder 2, the inner middle cylinder 3 and the rod 4 are slid in the casing 1 and the middle cylinders 2 and 3. Since the grease for smooth movement is filled, there is a problem that the grease leaks from the drain hole and scatters to contaminate the surrounding area.

  Furthermore, in the conventional overhead wire tension balancer, the connecting portion of the overhead wire connecting bracket 19 and the rod 4 is located inside the rod 4 and cannot be visually observed from the outside. There is a problem that takes time.

  The present invention has been made paying attention to such a conventional problem, and the tension of the train line can be maintained substantially constant without maintenance by the smooth expansion and contraction of the compression coil spring against the expansion and contraction of the train line due to various causes. In addition, it is possible to reliably prevent the inclination of the train line due to torsion between the cylindrical members based on the relative circumferential displacement at the end of the compression coil spring at the time of expansion and contraction, and drainage provided in the casing and the middle cylinder It is an object of the present invention to provide an overhead wire tension balancer in which grease filled in a casing and an inner cylinder does not leak from a hole.

In order to achieve the above-described object, the overhead wire tension balancer according to the present invention includes:
An overhead wire tension balancer for maintaining a constant tension of an overhead wire installed in the air,
The overhead wire tension balancer has a telescopically provided outer cylinder, a middle cylinder and a rod part consisting of a pair of opposed long plates provided in the central part, and the middle cylinder and the rod part are elastically biased in the immersion direction. A compression coil spring concentrically interposed between the outer cylinder and the middle cylinder and between the middle cylinder and the rod portion,
The outer cylinder is a square cylinder member, and the middle cylinder is provided with an outer-diameter-shaped flange corresponding to the inner diameter of the outer cylinder on the outer periphery, and this flange can be slid by regulating its rotation on the inner peripheral surface of the outer cylinder. ,
A plate that closes the opening at one end is fixed to the middle cylinder, and the plate is provided with a hole having a shape corresponding to the outer diameter shape of the rod portion made of a pair of long plates, and the rod portion passes through the hole and passes through the hole. It is characterized by being restricted in rotation by a hole and slidable.

With this configuration, the outer cylinder (casing) is a square cylinder member, and the middle cylinder is provided with a flange portion having an outer diameter corresponding to the inner diameter of the outer cylinder on the outer periphery, and this flange portion rotates on the inner peripheral surface of the outer cylinder. Since the inner cylinder is slidable in the axial direction with respect to the outer cylinder (can be moved back and forth), it cannot be rotated. In addition, a plate that closes the opening at one end is fixed to the middle cylinder, and the plate is provided with a hole having a shape corresponding to the outer diameter shape of the rod portion made of a pair of long plates, and the rod portion slides on the hole. Since the rod portion is provided so as to be movable, the rod portion is slidable (movable back and forth) in the axial direction with respect to the middle cylinder, but cannot be rotated. The train line (overhead line) is connected to the outside end of the rod portion via an overhead line connecting bracket.
Therefore, the rod portion is prevented from rotating with respect to the middle cylinder, and the middle cylinder is prevented from rotating with respect to the outer cylinder (casing). Even if a force to displace the coil spring in the relative circumferential direction acts, the rotation of the inner cylinder and the rod part can be prevented, and the inclination of the overhead line (train line) can be surely prevented. Even if vibration generated during passage or strong wind, or external force due to wind, snow, or icing acts on a train line (an overhead line), it is possible to avoid the twist of the train line.

  In the overhead wire tension balancer according to the present invention, an overhead wire connecting bracket for connecting an overhead wire is rotatably attached to an end of the rod portion on the outside side, and the overhead wire connecting bracket is attached to the rod portion. On the other hand, a rotation restricting means and its releasing means are provided.

With this configuration, the overhead wire connecting bracket can be restricted from rotating with respect to the rod portion by the rotation restricting means, and can be released with the releasing means. Accordingly, since the overhead wire (train line) is connected to the overhead wire connecting bracket, when the overhead wire does not tilt and is in a predetermined position, the rotation restriction means restricts the rotation of the overhead wire connecting bracket. The position can be held, and when the overhead line (train line) tilts, the rotation restriction is released by the release means, and the overhead wire connecting bracket can be rotated to correct it. can do.
As a result, the overhead wire connecting bracket can be prevented from rotating at any angular position with respect to each of the tubular members (outer cylinder, middle cylinder) and the rod portion, and the overhead wire (train line) is initially installed and thereafter Even when twisting occurs, the twisting can be eliminated, and the anti-rotation action can be surely exhibited after the twisting is eliminated.

The overhead wire connecting bracket rotation restricting means and the releasing means of the overhead wire tension balancer according to the present invention are provided on the rod member and the overhead wire connecting bracket. A cam portion that can be fitted and separated with respect to the cam member, and a spring that biases the cam portion in the fitting direction with respect to the cam member,
When the cam portion is pressed by the spring force of the spring and fitted into the cam member to restrict the rotation of the overhead wire connecting bracket with respect to the rod portion, the cam portion is separated from the cam member against the spring force of the spring. The rotation restriction of the overhead wire connecting bracket is released.

  With this configuration, the rotation of the overhead wire connecting bracket due to torsion or the like is restricted by fitting the cam member and the cam portion, and rotation can be prevented at any position. Even when the twist of the wire occurs, by changing the fitting position of the cam portion with respect to the cam member, the twist can be eliminated, and the anti-rotation action can be surely exhibited after the twist is eliminated.

Further, the overhead wire connecting bracket of the overhead wire tension balancer according to the present invention allows the attachment member to the rod portion to be visually checked from the outside, and enables inspection.
That is, the rod portion of the present invention is composed of a pair of opposed long plates, the ends of the opposed long plates are connected by a plate, and an overhead wire connecting bracket is attached to this plate. The portion is visible from between the opposing long plates. Accordingly, since inspection can be performed without disassembling, the inspection work is facilitated.

Further, the outer cylinder and the middle cylinder of the overhead wire tension balancer according to the present invention are provided with a drain hole, and the drain hole is provided with a filter for preventing leakage of grease filled in the outer cylinder and the inner cylinder. It is characterized by being.
With this configuration, leakage of the grease filled in the outer cylinder and the inner cylinder can be prevented, and the grease in the outer cylinder and the inner cylinder does not leak and contaminate the surroundings.

The overhead wire tension balancer of the present invention has the following effects.
(1) When the train line is extended and contracted, the compression coil spring can be smoothly extended and contracted so that the tension of the train line can be maintained substantially constant without maintenance, and based on the relative circumferential displacement at the end of the compression coil spring during the extension and contraction. It is possible to reliably prevent the inclination of the train line due to the twist between the constituent members.
(2) Since the drain holes of the outer cylinder and the middle cylinder are provided with a filter for preventing leakage of the filled grease, the grease does not leak from the drain hole and contaminate the surroundings.
(3) When the overhead line (train line) twists at the beginning and after the installation of the overhead line (train), the twist can be eliminated and the anti-rotation effect is reliably exhibited after the twist is removed. be able to.
(4) Since the attachment portion of the overhead wire connecting bracket to the rod portion is visible from the outside, the inspection work is easy.

The longitudinal section front view showing the tension balancer for overhead wires by the embodiment of the present invention. FIG. 2 is a bottom view showing a part of the overhead wire tension balancer shown in FIG. 1. FIG. 2 is a left side view of the overhead wire tension balancer shown in FIG. 1. FIG. 2 is a longitudinal front view of the casing illustrated in FIG. 1. The left view of the casing shown in FIG. The longitudinal cross-sectional front view of the middle cylinder shown in FIG. The left view of the middle cylinder shown in FIG. The front view of the rod shown in FIG. The top view of the rod shown in FIG. The front view of the plate of the rod shown in FIG. The front view of the plate of a casing. The right view of the coupling structure of the plate shown in FIG. 11, and a mounting bracket. The disassembled perspective view which shows the correspondence of the plate shown in FIG. 11, and a mounting bracket. The expanded sectional view which shows a connection pin periphery. The perspective view which shows the one end surface side of the tension balancer for overhead wires. The expanded sectional view which shows the other rotation control means of a connection pin, and its cancellation | release means. The longitudinal section front view showing the tension balancer for overhead wires by other embodiments of the present invention. FIG. 18 is a bottom view of part of the overhead wire tension balancer shown in FIG. 17. Front sectional drawing of the principal part which shows the conventional tension balancer.

  Hereinafter, an overhead wire tension balancer according to an embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the part similar to the said prior art example, and the detailed description is abbreviate | omitted.

  In the present embodiment, as in the conventional example, a rectangular tube 1 as an outermost peripheral cylindrical member 1 has a central cylinder 3 as a cylindrical member and a rod portion 4 as an overhead wire connecting member concentrically and Concentric so that the spring constants of the respective compression coil springs 6 and 7 having a large and small diameter between the inner and outer peripheral surfaces of the respective members are sequentially increased from the outside while being received so as to be movable back and forth in the axial direction (reciprocating freely). It is composed of a double structure that is interposed between them.

  The casing 1 is a square tube member, and in this example, as shown in FIGS. 4 and 5, the casing 1 is a square tube member having a rectangular cross section. As shown in FIGS. 6 and 7, an outer diameter flange portion 3 b corresponding to the inner diameter of the casing 1 is provided on the outer peripheral surface of the middle cylinder 3, and this flange portion 3 b is restricted from rotating on the inner peripheral surface of the casing 1. And is slidable. Therefore, since the rotation of the flange portion 3b is restricted by the inner peripheral surface of the casing 1, the middle cylinder 3 can slide (advance and retreat) in the axial direction with respect to the casing 1, but cannot rotate. Yes.

  For weight reduction, the rod portion 4 is formed by connecting a pair of long plates 4a and 4a with plates 10 and 11 at both ends as shown in FIGS. Therefore, the outer diameter shape of the rod part 4 is a substantially square shape. As shown in FIGS. 6 and 7, the intermediate cylinder 3 includes a plate 3 a that closes one end opening, and this plate 3 a corresponds to the outer diameter shape of the rod portion 4 including the pair of long plates 4 a and 4 a. A square-shaped hole 3d is provided, and the rod portion 4 is slidably provided through the hole 3d. Therefore, since the rotation of the rod portion 4 is restricted by the hole 3d, the rod portion 4 can slide (advance and retreat) in the axial direction with respect to the middle cylinder 3, but cannot rotate.

  FIG. 1 shows the assembled state of the overhead wire tension balancer. Between the inward and outward flange portions 1a and 3b as spring seats for locking the axial ends of the coil springs 6 and 7, and Each of the coil springs 6 and 7 is assembled between each pair of the plate 3a and the plate 11 with a predetermined initial load applied thereto.

  Each of the coil springs 6 and 7 according to the present invention is configured by combining a short coil spring having a short axial length in series. In the present embodiment, each of the three short coil springs 6a, 6b, 6c and 7a, 7b, 7c are combined in series. In addition, the tension change rate of the overhead wire can be arbitrarily coped with by changing the series number of each short coil spring, which is effective for the countermeasure against the overhead wire flow. Moreover, since each short coil spring 7a, 7b, 7c contacts in two places of the corner | angular part of the square rod part 4, respectively, stabilization of the shape at the time of load, especially buckling resistance becomes favorable.

  In the coil spring 6, adjacent short coil springs 6a, 6b, 6c are combined in series as described above, but the adjacent winding directions (right-handed / left-handed) are staggered. Has been. Similarly, the other short coil springs 7a, 7b, and 7c are alternately combined in a right-handed and left-handed manner. Thereby, the eccentric load by buckling at the time of combining a coil spring in series can be avoided as much as possible. Further, if each of the short coil springs 6a, 6b, 6c and 7a, 7b, 7c is wound in a manner that avoids an integer winding in which both ends of the coil ends are aligned, an eccentric load can be avoided as much as possible. In addition, salt damage resistance can be improved by using aluminum plating for surface treatment.

  The plate 10 is integrally provided by welding or the like at the protruding end portion on the right side of the rod portion 4 in FIG. 1, and this plate 10 is U-shaped through a rotation restricting means and a connecting pin 21 as its releasing means. The overhead wire connecting bracket (hook member) 19 is supported. Further, a substantially U-shaped support arm 12 that extends downward beyond the outer peripheral surface of the casing 1 is fixed to a part of each long plate 4 a of the rod portion 4. A base portion of a scale plate 8 that extends in the axial direction along the outer peripheral surface of the casing 1 is fixed. A scale indicating the displacement of the rod portion 4 relative to the casing 1 in the axial direction is marked on the scale plate 8.

  In the overhead wire tension balancer configured as described above, when installed in the standard state, FIG. 19 of the conventional example is shown in FIG. 1E_M / ?? <; 88? <7 /// & N0001 = 22 & N0552 = 9 & N0553 = 000005 In the same manner, the middle cylinder 3 and the rod portion 4 are installed in a state protruding from each other by a predetermined amount. In addition, the casing 1 is filled with grease in order to make the sliding of the middle cylinder 3 and the rod part 4 and the sliding of the casing 1, the middle cylinder 3, the rod part 4 and the compression coil springs 6 and 7 smooth. ing.

  A connecting pin 21 is connected to the plate 10 as shown in FIG. 14, and an overhead wire connecting bracket 19 is fixed to the tip of the shaft portion 21 a of the connecting pin 21. As shown in FIG. 14, a polygonal cross section 21b having a rectangular cross section is coaxially provided on the side of the shaft 21a opposite to the overhead wire connecting bracket 19, and the shaft 21a of the polygon cross section 21b is provided. On the side opposite to the head 21c, a head 21c is provided for preventing the removal during assembly.

A through-hole 10a having a polygonal cross-sectional shape as a detent mechanism corresponding to the polygonal cross-sectional portion 21b is formed in the center of the plate 10 so as to penetrate in the axial direction. The shaft portion 21a of the connecting pin 21 can be inserted through the through hole 10a, and has a size that can rotate when positioned in the through hole 10a. The overhead wire connecting bracket 19 is connected to the train line 20 via a insulator, a retaining rod portion, or the like as in the conventional example shown in FIG.
Therefore, when the polygonal cross section 21b of the connecting pin 21 is positioned in the through hole 10a, the rotation of the overhead wire connecting bracket 19 is restricted, and the connecting pin 21 is pushed in by the overhead wire connecting bracket 19 and the shaft portion of the connecting pin 21 When 21a is located in the through-hole 10a, it can rotate. In addition, the code | symbol 4c in FIG. 9 is the jig hole for installation provided in the overhead wire connection metal fitting 19 for making installation work easy.
Moreover, since the attachment part with the plate 10 of the overhead wire connecting metal fitting 19 can be visually observed between the pair of long plates 4a and 4a, the head 21c of the connecting pin 21 can be easily inspected.

  By providing the polygonal cross section 21b described above, the initial position around the axis of the overhead wire connecting bracket 19 at the time of initial assembly or maintenance is rotated at a pitch of 90 degrees because it is rectangular in the illustrated example. The position is adjustable. The shape of the polygonal cross section 21b is not limited to the rectangular shape in the illustrated example, and may be a polygonal shape, such as a triangle or a hexagon. In this case, the through hole 10a also corresponds to this shape.

  The rod portion 4 is reinforced by a U-shaped channel 25 as shown in FIGS. 8 and 14 welded between the long plates 4a and 4a. The U-shaped channel 25 also functions to prevent dust, birds, snakes and the like from entering the long plates 4a, 4a and the middle cylinder 3 from between the long plates 4a, 4a on the installation side of the plate 10. Reference numeral 4d denotes an installation jig hole provided on the long plate 4a for facilitating the installation work. The end of the rod portion 4 opposite to the overhead wire connecting bracket 19 is connected by a plate 11 between the long plates 4 a and 4 a forming the rod portion 4.

FIG. 16 shows another rotation restricting means and a releasing means for the connecting pin. In the connecting pin rotation restricting means and the releasing means in this example, a cam member 59 is fixed on the inner surface of the plate 10 of the rod portion 4, and a through hole 10 a communicating with the central hole of the cam member 59 is provided in the plate 10. Is provided. The shaft portion 58a of the connecting pin 58 to which the overhead wire connecting bracket 19 is fixed is inserted from the through hole 10a of the plate 10 and is slidably inserted through the cam member 59, and at the tip of the shaft portion 58a. A cam portion 58b that can be fitted / separated with respect to the cam member 59 is fixed, and a spring 60 that biases the cam portion 58b in the fitting direction with respect to the cam member 59 is provided on the shaft portion 58a. Configured.
According to this configuration, when the cam portion 58b is pressed by the spring force of the spring 60 and is engaged with the cam member 59, the rotation of the overhead wire connecting bracket 19 with respect to the rod portion 4 is restricted, and the overhead wire connection is established. When the connecting pin 58 is rotated together with the metal fitting 19, the cam portion 58 b can move forward and backward against the spring 60 against the cam member 59. Therefore, in the configuration of this example, the connecting pin 58 can be rotated at a predetermined angle, for example, 60 ° or 90 °, by simply rotating the connecting pin 58 together with the overhead wire connecting bracket 19. The cam portion 58b is automatically fitted to the cam member 59 by the spring force of the spring 60, and the position is maintained.

As shown in FIGS. 4 and 5, a plate 1 a having a circular hole 1 e through which the middle cylinder 3 can move is provided at one end opening of the casing 1. A recess 1c is provided. Further, a notch (water drain hole) 1d for draining water in the casing 1 is provided at the lower portion of the plate 1a.
On the other hand, a substantially rectangular rectangular plate 1b as shown in FIGS. 11 and 12 is attached to the other end (the left end in FIG. 1) of the casing 1 by welding, and two pieces are provided at the center of the rectangular plate 1b. A long hole 30 is formed. Further, a pair of opposing pieces 15a of a mounting bracket 15 having a substantially U-shape as shown in FIG. 13 is inserted into the two long holes 30, and the opposing pieces 15a of these mounting brackets 15 are bolts, nuts and the like. It can be fixedly attached to the utility pole side.

  Further, on the outer periphery of the casing 1 in the vicinity of the rectangular plate 1b, reinforcing plates 34 are fixed to the upper and lower portions by welding as shown in FIG. The casing 1 and the reinforcing plate 34 are provided with insertion holes 35 and 36 so as to communicate with each other. As shown in FIG. 3, a single bolt 37 is inserted into the insertion holes 35 and 36 from above, and a collar 38 for retaining is fitted to the end of the bolt 37 protruding downward from the lower reinforcing plate 34. It is inserted and the rivet 38a is stopped. Further, these bolts 37 are also passed through and held in the through holes 37b of the spacers 37a attached to the outside of the rectangular plate 1b (see FIG. 13).

  The distance between the pair of bolts 37, 37 attached to the casing 1 is wider than the distance between the opposing pieces 15a, 15a of the mounting bracket 15 protruding from the rectangular plate 1b. In addition, bolts and nuts 39 are attached to the mounting holes 15b provided in the facing pieces 15a of the mounting bracket 15 so as to be continuous with mounting members for mounting the tension balancer to the support column 16.

  Further, as shown in FIGS. 6 and 7, a notch (drainage hole) 3 c for draining water in the middle cylinder 3 is formed in the lower part of the plate 3 a provided on the inner circumference on one end side of the middle cylinder 3. Has been. Each notch 1d and 3c is provided with a filter 9 (see FIG. 15) that separates and discharges water that has entered the casing 1 and the inner cylinder 3 from lubricating grease and dust, and prevents leakage of the grease. Has been.

  Spring plates 43 and 44 that support the end portions of the coil springs 6 and 7 are in contact with the plate 11 around the ends of the flange portion 3b and the rod portion 4. These spring seats 43 and 44 are formed by superimposing two plate materials, and are configured so as to interpose an oil groove P containing lubricating oil. When a load is applied to the short coil springs 6a to 6c and 7a to 7c, a rotational force is generated around them, and a large frictional force is generated on the contact surface between these and the spring support portion. When oil is supplied to the contact surface of the plate material through the oil groove P, the behavior of the short coil springs 6a to 6c and 7a to 7c during expansion and contraction becomes smooth and stabilized. As a result, the occurrence of buckling as described above can be avoided.

  In the overhead wire tension balancer having such a configuration, the opposing pieces 15a, 15a of the mounting bracket 15 are inserted into the two long holes 30, 30 formed in the rectangular plate 1b, and the rectangular plate 1b and the substantially rectangular plate The flange portion 3b is non-rotatably attached in the casing 1 as a rectangular prismatic member. For this reason, it is possible to prevent the overhead wire connecting bracket 19 fixed to one end (the right end in FIG. 1) of the middle cylinder 3 and the rod portion 4 guided by the rectangular hole 3d of the middle cylinder 3 from rotating. Therefore, even if an external force due to wind, snow, icing, or the like acts, or vibrations occur when passing through a train or strong wind, and the torsional force acts on the overhead wire 20, the rotation of the rod portion 4 is restricted. Therefore, it is possible to prevent the overhead wire 20 from being twisted.

  Further, since the rod portion 4 does not rotate, the scale plate 8 faces downward in advance, and the display on the scale plate can be observed and confirmed from below the overhead wire tension balancer. Therefore, maintenance and inspection work for the entire overhead wire tension balancer based on this display can be facilitated. And in this embodiment, since the rod part 4 itself does not rotate, it is not necessary to provide a guide for restricting the rotation of the scale plate 8, and it is possible to reduce the number of parts and the manufacturing cost. it can. In addition, it is possible to ensure drainage from the drainage cutouts 1d and 3c provided at the bottom of the cylindrical members 1 and 3 and to prevent intrusion of dust and the like from the outside, and the filter 9 is filled. Grease leakage can be prevented (see FIG. 15).

  FIG. 17 is a longitudinal front view showing another embodiment of the overhead wire tension balancer, and FIG. 18 is a bottom view of the main part thereof. In this embodiment, an installation jig hole 4d for facilitating the installation work of the overhead wire connecting bracket 19 is provided on the rod portion 4 side (see FIG. 14). Also, a pair of bent support arms 12A are screwed on each long plate 4a and below the installation jig hole 4d so as to hang down, and between the ends of the support arms 12A, the same as described above. The scale plate 8 is fixed with screws so that the base of the scale plate 8 is sandwiched. Other configurations are substantially the same as those of the tension balancer shown in FIG. 1, and redundant description thereof is omitted.

As described above, the overhead wire tension balancer of the present embodiment includes a rod portion including a casing (outer cylinder) 1 provided in a telescopic shape, an intermediate cylinder 3 and a pair of opposed long plates 4a and 4a provided in the center. 4 and between the casing (outer cylinder) 1 and the middle cylinder 3 and between the middle cylinder 3 and the rod part 4 so as to elastically urge the middle cylinder 3 and the rod part 4 in the immersion direction. Compression springs 6 and 7 formed,
The casing (outer cylinder) 1 is a square cylinder member, and the intermediate cylinder 3 has an outer diameter-shaped flange portion 3b corresponding to the inner diameter of the casing 1 in sliding contact with the inner peripheral surface of the casing 1 (rotation is restricted). Slidable,
The middle cylinder 3 is fixedly provided with a plate 3a that closes an opening at one end, and the plate 3a is provided with a substantially rectangular hole 3d corresponding to the outer diameter shape of the rod portion 4 composed of a pair of long plates 4a and 4a. The portion 4 is provided slidably through the hole 3d, and an overhead wire connecting bracket 19 for connecting overhead wires is provided at an end of the rod portion 4 on the outside side, and the end of the outermost casing 1 is provided. A pair of elongated holes 30 is formed in the central portion of the rectangular plate 1b that closes the opening of the rectangular portion, and is inserted into these elongated holes 30 so as not to be removable, and the distal end portion is fixed to the column 16 side. It is the structure which provided the attachment metal fitting 15 which consists of a plate-shaped board | plate material.

  As a result, the mounting bracket 15 fixedly attached to the column 16 side is fixed to the plate 1 b of the casing 1, so that the casing 1 cannot rotate with respect to the mounting bracket 15. Since the intermediate cylinder 3 includes a flange portion 3 b having an outer shape corresponding to the inner diameter of the casing 1, the flange portion 3 b is restricted from rotating on the inner peripheral surface of the casing 1, so that it slides in the axial direction with respect to the casing 1. (Advance and retreat) is possible, but rotation is not possible. Further, the rod portion 4 composed of the pair of long plates 4a and 4a is inserted into the hole 3d of the plate 3a of the middle cylinder 3 so as to be slidably controlled, so that it slides in the axial direction relative to the middle cylinder 3. It can move but cannot rotate. Therefore, the casing 1, the middle cylinder 3, and the rod 4 are supported so as not to rotate with respect to the mounting bracket 15 and the support column 16 regardless of the relative circumferential displacement when the compression coil springs 6 and 7 are expanded and contracted. .

  A connecting pin 21 is interposed between the overhead wire connecting bracket 19 to which the overhead wire 20 is connected and the end of the rod portion 4. The connecting pin 21 serves as a rotation restricting means and a releasing means for the rod portion 4. I have. As a result, the overhead wire connecting bracket 19 can be prevented from rotating at an arbitrary angle with respect to the rod portion 4, and the twist can be corrected even when the overhead wire 20 is twisted at and after the overhead wire 20 is installed. After the twist correction, the anti-rotation function can be surely exhibited.

  Further, the casing 1, the middle cylinder 3 and the rod part 4 are provided in a telescopic shape, and the middle cylinder 3 is slidable in the axial direction with respect to the casing 1, but cannot be rotated. The overhead wire connecting bracket 19 and the rod are slidable in the axial direction but cannot be rotated, and the overhead wire connecting bracket 19 for connecting the overhead wire is prevented from rotating relative to the rod portion 4. By providing the rotation preventing means between the overhead wire connecting bracket 19 and the rod portion 4, the overhead wire connecting bracket 19 is prevented from rotating. Therefore, the overhead wire connecting bracket 19 is rotated by a twist or an external force on the overhead wire 20 side. Can be prevented.

  In this case, the connecting pin provided with the rotation restricting means and the releasing means is connected to the cam member 59 provided on the rod portion 4 and the overhead wire connecting bracket 19 so as to be fitted to the cam member 59. In the case of comprising the part 58b and the spring 60 for urging the cam part 58b in the fitting direction with respect to the cam member 59, the overhead wire is connected to the casing 1, the middle cylinder 3 and the rod part 4. The bracket 19 can be prevented from rotating at an arbitrary angular position, and even when the overhead wire 20 is twisted at the beginning and after the installation of the overhead wire (train line) 20, the cam portion 58 b is fitted to the cam member 59. The twist can be corrected by changing the alignment position, and the anti-rotation function can be reliably exhibited after the twist correction.

  The present invention makes it possible to maintain the tension of the train line substantially constant without maintenance by the smooth expansion and contraction of the compression coil spring with respect to the expansion and contraction of the train line, and a cylinder based on the circumferential displacement at the end of the compression coil spring during the expansion and contraction. It has the effect of suppressing the twist between the members and the twist of the train line, and is useful for an overhead wire tension balancer used in facilities for maintaining the tension of the train line.

1 Casing 1a Flange 1d Notch (Drain hole)
3 Middle cylinder 3b Flange 3c Notch (water drain hole)
4 Rod portion 4a Long plate 6, 7 Compression coil spring 9 Filter 10 Plate 10a Through hole 11 Plate 11a Vertical hole 19 Overhead wire connecting bracket 21, 58 Connecting pin 21a, 58a Shaft portion 21b Polygonal cross section 58b Cam portion 59 Cam member 60 spring

Claims (5)

An overhead wire tension balancer for maintaining a constant tension of an overhead wire installed in the air,
The overhead wire tension balancer has a telescopically provided outer cylinder, a middle cylinder and a rod part consisting of a pair of opposed long plates provided in the central part, and the middle cylinder and the rod part are elastically biased in the immersion direction. A compression coil spring concentrically interposed between the outer cylinder and the middle cylinder and between the middle cylinder and the rod portion,
The outer cylinder is a square cylinder member, and the middle cylinder is provided with an outer-diameter-shaped flange corresponding to the inner diameter of the outer cylinder on the outer periphery, and this flange can be slid by regulating its rotation on the inner peripheral surface of the outer cylinder. ,
A plate that closes the opening at one end is fixed to the middle cylinder, and the plate is provided with a hole having a shape corresponding to the outer diameter shape of the rod portion made of a pair of long plates, and the rod portion passes through the hole and passes through the hole. An overhead wire tension balancer that is slidably controlled by a hole.   In the overhead wire tension balancer, an overhead wire connecting bracket for connecting an overhead wire is rotatably attached to an end of the rod portion on the outside side, and the overhead wire connecting bracket is restricted from rotating with respect to the rod portion. The overhead wire tension balancer according to claim 1, further comprising: means and a releasing means thereof. The overhead wire connecting bracket rotation restricting means and the releasing means are a cam member fixed to the rod portion, and a cam portion that is provided on the overhead wire connecting bracket and can be fitted to and separated from the cam member. And a spring for biasing the cam portion in the fitting direction with respect to the cam member,
When the cam portion is pressed by the spring force of the spring and fitted into the cam member to restrict the rotation of the overhead wire connecting bracket with respect to the rod portion, the cam portion is separated from the cam member against the spring force of the spring. 3. The overhead wire tension balancer according to claim 2, wherein the rotation restriction of the overhead wire connecting bracket is released.   The overhead wire connecting bracket, which is pivotally attached to the outside end of the rod part and is provided with the rotation restricting means and the releasing means, can be visually inspected from the outside at the attachment part with the rod part. The overhead wire tension balancer according to claim 2 or 3, wherein   2. The outer cylinder and the middle cylinder are provided with a drain hole, and the drain hole is provided with a filter for preventing leakage of grease filled in the outer cylinder and the middle cylinder. Tension balancer for overhead wires.

Images