JP6083863B2 - Train line tension balancer - Google Patents

Description

  The present invention relates to a tension balancer that holds a train line that expands and contracts due to a temperature change or the like to a structure with a constant tension.

In overhead lines such as train lines, especially trolley lines, the tension is affected by the expansion and contraction due to temperature changes, the elastic elongation due to creep and wear, and the inclination of the support over time. Need to hold. For this reason, various tension balancers have been proposed.
The tension balancer described in Patent Document 1 includes a cylindrical spring case supported by a structure, a frame fixed to one end of the spring case, and a rotating arm pivotally attached to the frame at a first pivot point. A tension rod having one end pivotally attached to the second pivot point of the rotary arm, extending through the lid and extending through the spring case, and having a spring retainer at the other end; a spring retainer and the spring case lid; A coil spring inserted between them, and the train line is held at the third pivot point of the rotary arm.
In such a tension balancer, if the spring is lengthened in order to expand the range of follow-up to the amount of expansion / contraction of the train line, there is a possibility that a large deflection will occur when contracting and the inside of the spring case will come into contact. When the spring contacts the spring case, sliding resistance is generated, and the spring force is reduced. When the spring force is reduced, the tension of the trolley wire is lowered, and the trolley wire and the pantograph of the train cannot be kept in smooth contact.

Japanese Patent Publication No. 50-18651

In the conventional tension balancer, the sliding resistance between the steel spring and the inside of the spring case is large, and the sliding resistance between the cylinders is large, which may affect the spring force of the coil spring. Moreover, there is a problem that wear due to repeated sliding between the steel spring and the spring case is severe, and the deterioration over time is accelerated.
Therefore, an object of the present invention is to provide a tension balancer that can effectively prevent the deflection of the coil spring without causing a large sliding resistance when the coil spring contracts.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above problems, the tension balancer 1 of the present invention includes a guide pipe 14 extending along the inside of the coil spring 13. One end of the guide pipe 14 is fixed to the inside of the lid 3 of the spring case 2, and the other end side has a pair of opposed notch grooves 15 extending in the axial direction. The spring retainer 12 of the tension rod 10 includes a ring member 16 and a guide plate 17. The ring member 16 has an opening 19 having a diameter larger than the outer diameter of the guide pipe 14. The guide plate 17 is provided so as to cross the opening 19 of the ring member, and engages with the notch groove 15 of the guide pipe 14 so as to be relatively movable. The tension rod 10 extends through the guide pipe 14 and is coupled to the guide plate 16 of the spring retainer 12 on the other end side. When the spring 13 is bent due to the contraction, the ring member 16 of the spring retainer 12 abuts against the guide pipe 14 and holds the position of the coil spring 13.

  The tension balancer of the present invention can effectively prevent the deflection of the coil spring without causing a large sliding resistance when the coil spring contracts.

It is the front view which notched a part of tension balancer concerning the present invention. It is the top view which notched a part of tension balancer of FIG. FIG. 2 is an exploded perspective view in which a part of the tension balancer of FIG. 1 is cut away. FIG. 2 is an exploded perspective view of a part of the tension balancer of FIG. 1. It is a front view of the spring presser in the tension balancer of FIG.

Embodiments of the present invention will be described with reference to the drawings.
The tension balancer 1 includes a cylindrical spring case 2 that is supported horizontally or vertically on a structure. The spring case 2 includes a lid 3 having an opening 4 on one end side in the axial direction, and is fixed to the structure by hanging hands 5 and 6.

  A frame 7 is fixed to the outside of the lid 3 of the spring case 2. The frame 7 has a pair of parallel support plates 7a and 7b.

  The rotating arm 8 disposed between the support plates 7a and 7b is composed of a pair of parallel arm plates 8a and 8b having a substantially unequal triangular shape. The rotating arm 8 is pivotally attached to the frame 7 by the main axis 9 at a first pivot point near one vertex of its unequal triangle.

  The tension rod 10 is pivotally attached to the rotary arm 8 by the rotary shaft 11 at a second pivot point near the other vertex of the unequal triangle of the rotary arm 8. The other end of the tension rod 10 extends through the spring case 2 through the opening 4 of the lid of the spring case 2 and has a spring retainer 12 at the other end.

A coil spring 13 is inserted between the spring retainer 12 and the cover 3 of the spring case.
One end of the train line W is held at the third pivot point 22 near the other vertex of the unequal triangle of the rotating arm 8, and the train line W is held by the structure while maintaining a substantially constant tension regardless of the amount of expansion / contraction. It is done.

  The guide pipe 14 is made of stainless steel, one end is fixed to the inside of the lid 3 of the spring case 2, the inside of the coil spring 13 extends along this, and a pair of opposed notch grooves 15 extending in the axial direction to the other end. Have

  As shown in FIG. 5, the spring retainer 12 includes a ring member 16, a guide plate 17, and a puller 18.

  The ring member 16 includes an opening 19 having a diameter larger than the outer diameter of the guide pipe 14, and includes four spacers 20 arranged at equal intervals so as to slightly protrude into the opening 19. The spacer 20 is formed by bending a strip-shaped copper plate into an L shape, is latched on the edge of the ring member 16 on the opening 19 side, and is sandwiched between the other end of the coil spring 13 and the ring member 16. The spacer 20 rubs against the outer periphery of the guide pipe 14 and prevents both of them from being galling or seizing.

  The guide plate 17 is provided so as to cross the opening 19 of the ring member 16, and engages with the notch groove 15 of the guide pipe 14 so as to be relatively movable in the axial direction of the guide pipe 14.

  The tension rod 10 extends through the guide pipe 14 and is coupled to the puller 18 of the spring retainer 12 by the pivot pin 21 on the other end side.

  When the spring 13 bends due to the contraction, the ring member 16 of the spring retainer 12 abuts the guide pipe 14 via the spacer 20 and maintains the center position of the coil spring 13. The sliding resistance between the ring member 16 and the guide pipe 14 is relatively small, and the reaction force due to contact can be ignored.

1 Tension balancer 2 Spring case 3 Lid 4 Opening 5 Suspension hand 6 Suspension hand 7 Frame 8 Rotating arm 9 Spindle (first pivot point)
10 Tension rod 11 Rotation axis (second pivot point)
12 Spring retainer 13 Coil spring 14 Guide pipe 15 Notch 16 Ring member 17 Guide plate 18 Puller 19 Opening 20 Spacer 21 Pivot pin 22 Third pivot point W Train line

Claims (4)

A cylindrical spring case comprising a lid having an opening on one end side in the axial direction and supported by the structure;
A frame secured to the outside of the lid of the spring case;
A rotating arm having first to third pivot points arranged at the vertices of the unequal triangle and pivoted to the frame by a principal axis at the first pivot point;
A tension rod having one end pivotally attached to the second pivot point of the rotary arm by a rotary shaft, extending through the opening of the lid of the spring case and having a spring retainer at the other end;
A coil spring inserted between the spring retainer and the lid of the spring case,
In a tension balancer for supporting a train line, one end of which is held at the third pivot point of the rotating arm, on the structure while maintaining a substantially constant tension regardless of the amount of expansion / contraction,
A guide pipe having one end fixed to the inside of the cover of the spring case, extending along the coil spring inside the coil spring, and having a pair of opposed notches extending in the axial direction on the other end side;
The tension rod spring retainer includes a ring member having an opening larger than the outer diameter of the guide pipe, and a guide plate that is provided so as to cross the opening and engages with the notch groove of the guide pipe so as to be relatively movable. And
The tension rod extends through the guide pipe and is coupled to the guide plate of the spring press at the other end side,
A tension balancer for a train line, characterized in that when a spring is bent by contraction, a ring member of a spring pressing member abuts against a guide pipe to hold the position of the coil spring.   The tension balancer for a train line according to claim 1, wherein the ring member of the spring retainer includes a plurality of spacers that slightly protrude into the opening.   The spacer is formed by bending a copper plate into an L shape, is latched on the edge of the ring member on the opening side, and is sandwiched between the other end of the coil spring and the ring member. The tension balancer for a train line according to claim 2. The spring retainer comprises a puller that rises from the guide plate into the guide pipe,
4. The tension balancer for a train line according to claim 1, wherein the tension rod is pivotally attached to the puller at the other end by a pivot pin .

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