JP7025257B2 - 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.

For overhead lines such as train lines, especially trolley lines, the tension is affected by expansion and contraction due to temperature changes, elastic elongation due to creep and wear, and inclination of the support due to aging, so the tension is kept within a certain range. Need to hold. Therefore, various tension balancers have been conventionally proposed.
The tension balancer described in Patent Document 1 includes a cylindrical spring case supported by a structure, a frame fixed to one end side of the spring case, and a rotating arm pivoted to the frame at a first pivot point. , One end is pivotally attached to the second pivot point of the rotary arm, the tension rod extends through the lid and extends inside the spring case, and the other end is provided with a spring retainer, and the spring retainer and the lid of the spring case. It is equipped with a coil spring inserted between them, and the train line is held at the third pivot point of the rotating arm. The frame is equipped with an indicator with a scale indicating the rotational displacement of the reference position of the rotating arm according to the displacement of the tension rod due to the expansion and contraction of the train line, with the initial pull-out position of the tension rod as the reference point. The amount of expansion and contraction of the line can be visually confirmed.

Japanese Unexamined Patent Publication No. 2014-189112

In the above-mentioned conventional tension balancer, due to the management of the train line, the amount of expansion and contraction of the train line at the time of the inspection can be confirmed by visually checking the indicator at the time of inspection about once every six months. The maximum amount of expansion and contraction, which is important above, cannot be confirmed.
Therefore, an object of the present invention is to provide a tension balancer capable of measuring the maximum expansion / contraction amount of a train line and improving the accuracy of state management of the train line.

In order to solve the above problems, the tension balancer 1 of the present invention includes a lid 3 having an opening on one end side in the axial direction, and has a cylindrical spring case 2 supported by a structure and a lid 3 of the spring case 2. It has a frame 7 fixed to the outside and three first to third pivot points arranged in the vicinity of each apex of the unequal side triangle, and is pivoted to the frame 7 by the spindle 9 at the first pivot point. One end is pivotally attached to the second pivot point of the rotary arm 8 by the rotary arm 8 to be worn and the rotary shaft 11, and the other end extends through the opening of the lid 3 of the spring case 2 and extends inside the spring case 2. The tension rod 10 provided with the spring retainer 12 in the portion, the coil spring 13 inserted between the spring retainer 12 and the lid 3 of the spring case 2, and the displacement of the reference position of the rotary arm 8 due to the expansion and contraction of the train line W. The train line W is provided with an indicator 22 for indicating the scale of the expansion / contraction amount of the train line W, and one end thereof is held at the third pivot point of the rotary arm 8. It is configured to support the structure while maintaining. The indicator 22 is pushed by the pointer 24 fixed to the reference position of the rotary arm 8, the scale plate 23 having the scale 23a fixed to the frame 7 and indicated by the pointer 24 displaced together with the rotary arm 8, and the pointer 24. It is movably held on the scale plate 23, and is provided with holding needles 25 and 26 that indicate the maximum displacement of the pointer by instructing the scale at the stationary position of the moving end of the pointer.

The tension balancer of the present invention can confirm the maximum expansion / contraction amount of the train line by visually observing the indicator scale of the holding needle of the indicator at the time of periodic inspection in the management of the train line. It is possible to grasp the state based on the history of.

It is a perspective view of the tension balancer which concerns on this invention. It is a front view of the upper end part of the tension balancer of FIG. FIG. 2 is a sectional view taken along line III-III of FIG. It is a perspective view of an indicator. It is a front view of a holding needle. It is an exploded perspective view of a part of the tension balancer of FIG. It is a bottom view of the spring presser in the tension balancer of FIG.

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

The 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 arranged between the support plates 7a and 7b is composed of a pair of parallel arm plates 8a and 8b having a substantially isosceles triangle shape. The rotary arm 8 is rotatably pivoted to the frame 7 by a spindle 9 near the first vertex of its isosceles triangle.

The tension rod 10 is rotatably pivotally attached to the rotating arm 8 by the rotating shaft 11 near the second apex of the isosceles triangle of the rotating arm 8. The other end side of the tension rod 10 penetrates the opening 4 of the lid of the spring case 2 and extends inside the spring case 2, and the other end portion is connected to the spring retainer 12.

A coil spring 13 is inserted between the spring retainer 12 and the lid 3 of the spring case 2. One end of the train line W is held near the third apex of the isosceles 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 and contraction thereof.

As shown in FIGS. 1 and 6, the guide pipe 14 is made of stainless steel, one end thereof 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 the axis line is on the other end side. It has a pair of opposed notch grooves 15 extending in the direction.

As shown in FIGS. 6 and 7, the spring retainer 12 includes a ring member 16, a guide plate 17, and a pull tab 18. The ring member 16 has 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 project into the opening 19. The spacer 20 is formed by bending a strip-shaped copper plate into an L shape, is hooked 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 to prevent galling and seizure of both. 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 inside the guide pipe 14 and is coupled to the pull tab 18 of the spring retainer 12 by a pivot pin 21 on the other end side.

As shown in FIGS. 2 to 4, the indicator 22 has a pair of scale plates 23 integrally with the frame 7, a pointer 24 indicating the scale 23a on the scale plate 23, and a scale plate pushed by the pointer 24. It is provided with four holding needles 25 and 26 that are movably held by 23.

The scale plate 23 is composed of a fan-shaped plate that extends upward and bends integrally and continuously on the upper portions of the support plates 7a and 7b of the frame 7. On the upper part of the scale plate 23, the scales 23a arranged in an arc shape indicated by the pointer 24 are displayed. The scale 23a indicates the displacement of the rotary arm 8 from the origin position corresponding to the displacement of the tension rod 10 due to the expansion and contraction of the train line W as a numerical value on the minus side for the extension amount of the train line W and on the plus side for the contraction length. The upper edge portion of the scale plate 23 is provided with an arcuate elongated hole 23b extending in the rotational direction of the rotary arm 8 along the upper edge.

The pointer 24 is a pair of needle portions 24a exposed to the outside of the facing scale plates 23 and 23 to indicate the scales 23a, respectively, and an elongated hole of the scale plate 23 extending in the vertical direction from the vertical intermediate portion of the needle portions 24a. The arm portion 24b penetrating each of the 23b and the arm portion 24b extending from both sides to the left and right are extended between the scale plates 23 and 23, and the connecting block 8c fixed between the arm plates 8a and 8b of the rotary arm 8 is attached. It is provided with a fixing portion 24c fixed by one bolt 24d. The pointer 24 indicates the moving position of the rotary arm 8 from the initial reference position (origin) corresponding to the displacement of the tension rod 10 due to the expansion and contraction of the train line W, and the expansion and contraction amount of the train line W is measured on the scale plate 23. It is represented by the scale 23a.

As shown in FIG. 5, the holding needles 25 and 26 of the scale plate 23 are provided with a bolt 27 penetrating the elongated hole 23b of the scale plate 23, an adjusting nut 28 screwed into the bolt 27, and an adjusting nut 28 and a bolt head 27b. A pair of front and rear washers 29, 29 passed through the bolt shaft 27a between them, a spring 30 ringed around the bolt shaft 27a between the adjusting nut 28 and the washer 29, and a split pin for preventing the adjusting nut 28 from coming off. 31 and. In the holding needles 25 and 26, the washer 29 pushed by the spring 30 on the bolt 27 penetrating the scale plate 23 sandwiches the scale plate 23 with the other washer 29. The washer 29 is made of a metal or synthetic resin material, and is easily displaced together with the pointer 24 due to the expansion and contraction of the train line W due to the contact resistance with the scale plate 23 pushed by the spring 30, but the washer 29 maintains the stationary position due to the separation of the pointer 24. do. The adjusting nut 28 can change the compression length of the spring 30, and can adjust the contact resistance between the washer 29 and the scale plate 23.

In this tension balancer 1, the pointer 24 displaced from the origin position of the scale plate 23 corresponding to the displacement of the rotary arm 8 due to the expansion and contraction of the train line W of the rotary arm 8 provides a scale 23a indicating the expansion and contraction amount of the train line W. Instruct. At this time, the holding needles 25 or 26 arranged adjacent to both sides of the pointer 24 at the time of initial setting move in the elongated hole 23b integrally with the pointer 24, but are stationary due to the separation of the pointer 24 due to the expansion / contraction operation of the train line W. In order to hold the position, it is pushed to both ends of the moving range of the pointer 24, and the stationary positions of the holding needles 25 and 26 indicate the maximum amount of expansion and contraction of the train line.

In the present embodiment, the tension balancer 1 in which the spring case 2 having the coil spring 13 built in the vertical direction is vertically supported by the structure is configured, but the present invention is not limited to this, and the coil spring is not limited to this. The spring case 2 having the 13 built in the horizontal direction may be a tension balancer that is horizontally supported by the structure.

1 Tension balancer 2 Spring case 3 Lid 4 Opening 5 Hanging strap 6 Hanging strap 7 Frame 7a Support plate 7b Support plate 8 Rotating arm 8a Arm plate 8b Arm plate 8c Coupling block 9 Main shaft (first pivot point)
10 Tension rod 11 Rotating shaft (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 Indicator 23 Scale plate 23a Scale 23b Long hole 24 Pointer 24a Needle part 24b Arm part 24c Fixed part 24d Bolt 25 Retaining needle 26 Retaining needle 27 Bolt 27a Bolt shaft 27b Bolt head 28 Adjusting nut 29 Washer 30 Spring 31 Split pin W Train line

Claims (1)

A cylindrical spring case that has a lid with an opening on one end side in the axial direction and is supported by the structure.
The frame fixed to the outside of the lid of the spring case and
A rotating arm having three first to third pivot points arranged in the vicinity of each vertex of an isosceles triangle and pivotally attached to the frame by a spindle at the first pivot point.
A tension rod having one end pivotally attached to a second pivot point of the rotating arm by a rotating shaft, extending through the opening of the lid of the spring case, extending into 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,
It is equipped with an indicator that indicates the displacement of the reference position of the rotating arm due to the expansion and contraction of the train line to indicate the scale of the expansion and contraction amount of the train line.
In a tension balancer that supports a train line whose one end is held to a third pivot point of the rotary arm to a structure while maintaining a substantially constant tension regardless of the amount of expansion and contraction.
The indicator is a pointer fixed to a reference position of the rotating arm and a pointer.
A scale plate having a scale indicated by the pointer, which is fixed to the frame and displaced together with the rotating arm.
It is provided with a holding needle that is pushed by the pointer and is movably held on the scale plate, and indicates the maximum displacement of the pointer by instructing the scale at the stationary position of the moving end.
The scale plate is provided with an arcuate elongated hole along the scale.
The holding needle includes a bolt penetrating the elongated hole, an adjusting nut screwed into the bolt, and a pair of washers penetrating the bolt and facing each other with the scale plate sandwiched between the adjusting nut and the bolt head. A tension balancer for a train line, characterized in that a compression spring is provided between the adjusting nut and one of the washers, which is locked around the axis of the bolt and presses the washer against the scale plate .

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