JP2003129424A - Shock absorbing device for rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorbing device for ropes, of which the miniaturization, weight reduction, and the improvement of a shock absorbing capability can be achieved simultaneously, and which is superior in transportation handleability and attachability. SOLUTION: The shock absorbing device comprises a restricting plate 20 having an extended part 21 formed by turning back a plate in the middle, a partition 30 interposed between two parts of the restricting plate 20 and splitting up the inner space of the extended part 21 into two sections to form housing spaces 24, 24 for each rope A, B, and fastening means 40, 41 for fastening the extended part of the restricting plate 20 in the direction of contraction to make the extended part 21 and the partition 30 come in contact with each rope A and B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber for a rope that can be applied to a shock absorbing fence that absorbs impact force such as rock fall, avalanche, and collapsed earth and sand, and a guard rail made of rope.

[0002]

2. Description of the Related Art A shock absorber for a rope which constitutes a shock absorbing fence is disclosed in, for example, Japanese Patent Laid-Open Nos. 6-57712 and 7-26527. In both of these devices, a rope material is sandwiched between two plate bodies and fastened with bolts to be gripped, or a bolt provided with a wedge element is pressed against the plate body to be gripped. The tension acting on the rope is attenuated by utilizing the frictional resistance of the gripping portion that grips the rope.

[0003]

The conventional shock absorber has the following problems. <A> The body of the shock absorber is made of cast iron because it is not suitable for cutting. Therefore, the shock absorber is heavy, weighing several tens of kilograms, and requires a great deal of labor for carrying and assembling. <B> Since the shock absorber used for the rockfall protection fence is formed thick so as to withstand the impact of a huge rockfall, not only the weight but also the manufacturing cost increase. <C> In the type in which the rope is partially tightened with a bolt having a wedge element, since the contact area with the rope is small, the cushioning performance is low despite the large tightening force of the bolt. <D> If the shock absorber is of a type that clamps the rope between two plates, in order to exert the prescribed shock absorbing performance, all bolts installed on both sides of the shock absorber main body so as to straddle the rope should be used. It is necessary to conclude evenly. However, it is difficult to uniformly tighten the bolts, and manufacturing tolerances of the shock absorber are also added, so that the tightening force of the bolts on each side tends to vary. In particular, the conventional shock absorbing device can evaluate the shock absorbing performance only after an actual rock fall acts, and the actual shock absorbing performance cannot be confirmed immediately after installation. Therefore, there remains concern about the reliability of the stable cushioning performance. <E> In installation work in mountainous areas where it is difficult to carry in equipment such as compressors, bolts must be tightened with simple tools such as spanners and wrenches. If the bolt tightening work relies on manual work, variations in the gripping force of the rope are more likely to occur.

The present invention has been made in view of the above points, and an object thereof is to provide the following impact device for ropes. A shock absorber for ropes that can achieve both compactness and light weight and high performance in shock absorption. A shock absorber for ropes that is easy to carry and assemble. A rope shock absorber with excellent manufacturability.

[0005]

[Means for Solving the Problems] That is, the invention according to claim 1 is a device to be installed at the overlapping portion of a plurality of ropes on which a tensile force acts, and has an expansion portion formed by folding back the center of a plate body. The restraint plate and tightening means for tightening the expanded portion of the restraint plate in the contracting direction, and bringing the expanded portion and the partition plate into contact with each rope, through the expanded portion, the tightening force applied to the restraint plate, The rope shock absorber is characterized in that it can be transmitted to each rope as an even restraining force. The invention according to claim 2 is a device to be installed at a superposed portion of a plurality of ropes on which a tensile force acts, and a restraint plate having an expansion portion formed by folding back the center of a plate body, and an interposing member in the restraint plate. Tighten the partition plate that divides the inner space of the expansion part and divides the inside of the expansion part into two parts, and tighten the expansion part of the restraint plate in the contraction direction so that the expansion part and the partition plate contact each rope. The rope cushioning device is characterized in that the fastening force acting on the restraint plate can be transmitted as an equal restraint force to each rope through the expansion portion. Claim 3
The invention according to claim 2 is the shock absorbing device for a rope according to claim 1, wherein the restraint plate is formed of a spring steel plate. The invention according to claim 3 is the rope shock absorber according to claim 1 or 2, wherein the tightening means of the restraint plate is a plurality of bolts.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 of the present invention will be described below with reference to the drawings.

<A> Structure of shock absorber FIG. 1 is a perspective view of the shock absorber 10, and FIG. 2 is a cross sectional view thereof. The shock absorber 10 according to the present invention is a restraint for directly restraining the ropes A and B in a gathering portion of the ropes A and B on which mutually opposite tensile forces act, and accommodates the two ropes A and B. The restraint plate 20 includes a partition plate 30 that is interposed between the restraint plate 20 and a tightening unit that tightens both ends of the restraint plate 20.

The ropes A and B include various ropes such as wire ropes, PC strands and PC steel rods having excellent tensile strength. Further, although the case where the tightening means is the bolt 40 and the nut 41 is shown in this example, the present invention is not limited to this, and a known means capable of tightening the end portion of the restraint plate 20 can be applied.

<B> Restraint plate The restraint plate 20 is formed by bending a rectangular plate material, and the center portion of this plate material is bent into an oblong substantially oblong shape (bulb shape), and an expanded portion is curved. 21 and the extension 2
The end of 1 is bent outward, and the flat portion beyond the bent portion 25 is formed as the rising portions 22 and 22.

A plurality of bolt holes 23 are formed in the rising portions 22 and 22 so as to match the bolt holes 31 provided in one lateral line at a predetermined interval on one of the partition plates 30. Bolt holes 23,
The formation position of 31, that is, the fastening position of the bolt is preferably a position closer to the expanded portion 21 in consideration of the restraint effect of the restraint plate 20.

As shown in FIG. 2, the inner space of the expansion portion 21 is divided into two by a partition plate 30 to form two storage spaces 24, 24 for individually storing the ropes A, B respectively.

Explaining the expansion section 21 in more detail, the expansion section 21 has a bilaterally symmetrical shape, and the curved sections 21a and 21a capable of making surface contact with the peripheral surfaces of the ropes A and B, and the curved sections. The connecting portion 21b connects between 21a and 21a. The curved portion 21a is formed so as to have a radius of curvature equal to or slightly larger than the radius of curvature of each rope A, B, and is formed so as to be able to come into contact with the outer peripheral surface of each rope A, B which is close to half. The restraint plate 20 is formed of a single plate body because when the rising portions 22 and 22 of the expanded portion 21 are tightened with the bolts 40, this tightening force is uniformly restrained to the ropes A and B through the expanded portion 21. This is because it acts as force. Therefore, the circumferential length of the expanded portion 21 is equal to the rising portion 2 of the expanded portion 21.
When 2 and 22 are tightened with bolts 40, each rope A, B
Shall be set to a dimension that can be constrained.

The length of the restraint plate 20 in the longitudinal direction (direction parallel to the ropes A and B) and the number of bolts 40 to be installed should be appropriately determined according to the rope diameter and the tensile force acting on the ropes A and B. To do.

The constraining plate 20 can be made of various metal plates having high tensile strength, but is preferably made of spring steel. When the restraint plate 20 is formed of one general steel plate, the ropes A and B can be restrained with an equal force, but the restraint force is determined only by the tightening force of the bolt 40, and the torque control of each bolt 40 is performed. Must be done strictly. If spring steel is used for the restraint plate 20, since the spring force specific to the spring steel can be used in addition to the tightening force of the bolt 40, the ropes A and B can be restrained more firmly and elastically. Further, when spring steel is used for the restraint plate 20, even if there is some variation in the tightening force of each bolt 40, the spring force of the restraint plate 20 alleviates this variation. On the other hand, it becomes possible to restrain with a stable force.

<C> Partition Plate The partition plate 30 is a rigid body having a rectangular shape, and has a thickness several times that of the constraining plate 20. The partition plate 30 is arranged in the restraint plate 20 in order to prevent the ropes A and B from directly contacting each other and to enhance the restraining effect of the restraint plate 20 on the ropes A and B.

In some cases, the end of the partition plate 30 may be fixed to the inner surface of the expansion portion by welding or the like so as to be integrated, and the partition plate 30 may be omitted so that the ropes A and B are brought into direct contact with each other to be restrained. In some cases.

[0017]

Next, a method of using the shock absorber according to the present invention will be described.

<A> The constraining plate 20 before the assembly bolts are fastened, as shown by the alternate long and short dash line in FIG. 2, through the opening between the rising portions 22 and 22 or by inserting it from the side of the expanding portion 21. The ropes A and B are housed inside. At this time, the partition plate 30 is positioned between the ropes A and B in the restraint plate 20.

Next, the bolt 40 is inserted through the rising portions 22 and 22 of the restraint plate 20 and the bolt holes 23, 31 and 23 of the partition plate 30, and the nut 41 is screwed and tightened with a simple tool such as a spanner or a wrench. Then, the peripheral surfaces of both ropes A and B are restrained with a predetermined force.

The mechanism until the shock absorber 10 restrains the ropes A and B will be described in detail with reference to FIG.
When the tightening force F toward the approaching direction of the partition plate 30 is applied to the pair of rising portions 22 and 22, the entire extended portion 21 of the restraint plate 20 is displaced in the approaching direction of the partition plate 30 and each rope A, B. The inner surface of the expanded portion 21 and the side surface of the partition plate 30 contact the peripheral surface of the. A binding force does not occur just by abutting lightly.

When the tightening force F is continuously applied after that,
The tightening force F is determined by the bending portions 21a, 21 of the expanded portion 21.
It acts as forces f ₁ and f ₁ for pulling a in the approaching direction of the partition plate 30. Since the restraint plate 20 is formed of a single plate body, the traction force f acting on both the curved portions 21a, 21a
1, f ₁ are transmitted to each other, and the constraining plate 20 (connecting portion 21
It is supported at the center 21d in b). As a result, the restraint plate 20
Of the restraint plate 20 and the partition plate 30
The binding force of the ropes A and B gradually increases in a state of surface contact with the side surface of the rope. In this way, by simply tightening one side (upright portions 22, 22) of the restraint plate 20, both ropes A,
B can be restrained uniformly and with a large force.

The bolt 40 is tightened until a predetermined restraining force is reached. If the restraint plate 20 is formed so that the restraining force of the ropes A and B reaches a predetermined value when the rising portions 22 and 22 come into contact with the side surface of the partition plate 30, the troublesome bolt 40 is generated.
It is not necessary to manage the tightening torque of. The shock absorber 10
Is smaller and lighter than the conventional cast iron shock absorber, which weighs several tens of kilograms, and is therefore easy to transport and assemble.

<B> Buffering action The buffering action when a tensile force acts in the opposite direction on each rope A, B will be described.

When the tensile force acting on each rope A, B is smaller than the frictional resistance based on the restraining force of the shock absorber 10 for restraining each rope A, B, each rope A, B and the shock absorber 1
Relative sliding does not occur between 0.

When the tensile force acting on each rope A, B becomes large and exceeds the frictional resistance due to the restraining force of the shock absorber 10 for restraining each rope A, B, the force between each rope A, B and the shock absorber 10 is increased. To start relative sliding. That is, the tensile force is attenuated by the frictional resistance of the contact portion of the restraint plate 20 with the expanded portion 21 and the contact portion with the side surface of the partition plate 30 that are pressed against the peripheral surfaces of the ropes A and B. In particular, since the contact surface between the outer peripheral surface of each rope A, B and the shock absorber 10 is formed in a wide area along the longitudinal direction of the rope, a very high shock absorbing performance can be obtained by ensuring a large friction resistance surface.

[0026]

Second Embodiment Hereinafter, other embodiments will be described. In the description, the same parts as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 4, on both side surfaces of the partition plate 30,
It is possible to form concave grooves 32, 32 having an arcuate cross section, which can accommodate the peripheral surfaces of the ropes A, B along the longitudinal direction of the partition plate 30. If the circumferential surfaces of the ropes A and B are housed and constrained in the recessed grooves 32 and 32, the cushioning performance of the cushioning device 10 is increased due to the increase in the contact area with the partition plate 30.

Further, either one or both of the constraining plate 20 and the partitioning plate 30 to be contacted with the peripheral surfaces of the ropes A and B may be provided with dot-shaped or ridge-shaped resistance projection groups.

[0029]

[Third Embodiment of the Invention] In the above-described embodiment, the case where the total number of ropes to be restrained is two has been described. However, each accommodation space 24, 2 in which the inner space of the expansion portion 21 is divided into two by the partition plate 30
It may be configured to accommodate and restrain two or more ropes in each of the four.

[0030]

Fourth Embodiment of the Invention The restraint plate 20 may have a hinge structure capable of rotating the center of the expansion portion 21.

[0031]

The present invention can obtain the following effects. <A> Since the restraint plate is formed of a single plate body, it is possible to reduce the size and weight and the cost as compared with the conventional cast iron product. <B> By simply tightening the ends of the folded back restraint plate, each rope can be restrained with an even force, and a continuous contact surface along the length direction of the rope can be secured, so high damping performance can be exhibited. Therefore, as described above, not only the size and weight of the device can be reduced, but also high performance in cushioning performance can be achieved. <C> The shock absorber can be set with only a simple tool such as a spanner or wrench, and the workability of assembly is good. <D> When spring steel is used for the restraint plate, the spring force specific to the spring steel can be utilized, so that it is possible to reduce variations in the tightening force and to firmly and elastically restrain the rope. Further, there is no variation in binding force, and stable damping performance can be exhibited.

[Brief description of drawings]

FIG. 1 is a perspective view of a rope cushioning tool according to the present invention.

FIG. 2 is a cross-sectional view of a rope cushioning tool.

FIG. 3 is an explanatory diagram of the restraint principle of each rope.

FIG. 4 is an explanatory view of another embodiment in which a groove is provided on the side surface of the partition plate.

[Explanation of symbols]

A, B rope 10 Rope shock absorber 20 restraint plate 21 Extension 21a, 21a curved portion 21b Contact section 22,22 Rise 23, 23 bolt holes 24, 24 accommodation space 30 dividers 40 volts 41 nuts

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Yoshida             561 Mizushima, Oyabe City, Toyama Prefecture (72) Inventor Masai Sono             2-24-14 Higashi Nihonbashi, Chuo-ku, Tokyo Nihonze             Varnish Pipe Co., Ltd. (72) Inventor Kazuo Minami             13-33 Minamitaikoyama, Kosugi Town, Imizu District, Toyama Prefecture F-term (reference) 2D001 PA05 PA06 PC03 PD05                 2D101 CA06 EA01 FA25 FB15 GA11

Claims (4)

[Claims] 1. A device to be installed at a superposed portion of a plurality of ropes on which a tensile force acts, the constraining plate having an expansion part formed by folding back the center of a plate body, and the expansion part of the constraining plate in a contracting direction. Tightening means for tightening the expansion part and the partition plate to contact each rope, and the tightening force acting on the restraint plate can be transmitted to each rope as a uniform restraining force through the expansion part. A shock absorber for ropes, which is characterized in that 2. A device to be installed at a superposed portion of a plurality of ropes on which a tensile force acts, the constraining plate having an expanding portion formed by folding back the center of the plate body, and inserting and expanding in the constraining plate. A partition plate that divides the inner space of the part into two parts to define a rope accommodation space; and a tightening device that tightens the expansion part of the restraint plate in the contraction direction and makes the expansion part and the partition plate contact each rope. The rope shock absorber is characterized in that the tightening force applied to the restraint plate can be transmitted as an equal restraint force to each rope through the expansion portion. 3. The rope shock absorber according to claim 1, wherein the restraint plate is formed of a spring steel plate. 4. The shock absorbing device for a rope according to claim 1, wherein the tightening means of the restraint plate is a plurality of bolts.