JP2001317580A - Buffer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer capable of providing high impact absorbing effect and reducing maintenance cost of an impact absorbing fence. SOLUTION: The buffer 1 includes a tube-shaped body 2; a female screw part 22 formed on a part of a housing chamber 21 formed inside the body 2; an outer coil spring 32 and an inner coil spring 31 housed in the housing chamber 21; a flange part 23 integrally formed on one side of the body 2; and a pressurizing bolt 4 having a male screw part 41 for screwing into other side of the body 2, an inserting hole 43 and an enlarged head part 42. The inner coil spring 31 is formed so as to have an outer diameter larger than an inner diameter of the outer coil spring 32 and smaller than an outer diameter of the outer coil spring 32, and further have an inner diameter larger than a diameter of a rope 5. The outer diameter of the outer coil spring 32 is smaller than a diameter of the housing chamber 21. The male screw part 41 is formed so as to be screwed into the female screw part 22 of the housing chamber 21. A diameter of a hole part 24 formed on the flange part 23 is larger than the diameter of the rope 5 and is smaller than the inner diameter of the inner coil spring 31. A diameter of the inserting hole 43 is larger than the diameter of the rope 5 and is smaller than the inner diameter of the inner coil spring 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber used for a shock absorbing fence such as a rock fall prevention fence or a guard rope.

[0002]

2. Description of the Related Art Conventionally, as a fence for protection against falling rocks, avalanches, etc., wire ropes are stretched in multi-stages between columns erected at predetermined intervals, and a wire mesh or the like is provided over the entire area of the wire rope group. It is formed by stretching the net.

[0003]

The above-mentioned conventional protection fence has the following problems. <B> Conventional fences absorb shocks by the tensile strength of the wire rope and the bending strength of the struts, so in order to increase the impact absorption rate, use large-rigid struts with a large cross section, A wire rope having high tensile strength must be used, and there has been a problem of a decrease in workability due to an increase in the weight of each member and a problem of an increase in construction cost. <B> In order to solve the above-mentioned problem of the fence, various techniques have been proposed in which a shock absorber capable of gripping a wire rope is attached to a support and a shock is absorbed by a frictional resistance between the shock absorber and the wire rope. A conventional shock absorber is composed of a plurality of plates capable of gripping a wire rope and a plurality of bolts for tightening these plates, and the number of components of the shock absorber is large. Moreover, in order to obtain a predetermined gripping force, it is necessary to tighten a large number of bolts with a uniform torque, so that there is a problem that the tightening requires a lot of trouble.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a high-performance shock absorber.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a tubular main body through which a rope is inserted, a storage chamber formed inside the main body, and one of the storage chambers. A screw portion to be formed in a portion, an outer coil spring and an inner coil spring housed in the storage chamber from the other side of the main body, a flange formed integrally with one of the main body, and screwed into the other side of the main body. A shock absorber comprising a male screw portion, a pressure hole having an insertion hole and an enlarged head, wherein the inner coil spring has an outer diameter larger than an inner diameter of the outer coil spring, and an outer coil. While being formed smaller than the outer diameter of the spring, the inner diameter is formed larger than the diameter of the rope,
The outer diameter of the outer coil spring is formed to be smaller than the diameter of the storage chamber, the male screw portion is configured to be screwable into the female screw portion of the storage chamber, and the diameter of a hole formed in the flange portion. Is formed larger than the diameter of the rope and smaller than the inner diameter of the inner coil spring, and the diameter of the insertion hole is
The shock absorber is formed to be larger than the diameter of the rope and smaller than the inner diameter of the inner coil spring. Further, the present invention is a shock-absorbing device having a plurality of hooking portions formed on the outer periphery of the main body of the above-described shock-absorbing device and having a hooking hole penetrating in the axial direction. Further, the present invention provides a tubular main body through which a rope can be inserted, a plurality of coil springs which are accommodated in the main body by being overlapped and have different diameters through which the rope can be inserted, and a coil spring having the different diameter, And a pressure bolt capable of applying a contraction force along the axial direction of the rope.

[0006]

[First Embodiment of the Invention] An embodiment of a shock absorber 1 of the present invention will be described below with reference to the drawings.

<A> Overall Structure (FIG. 1) The shock absorber 1 comprises a main body 2, an inner coil spring 31, an outer coil spring 32, and a pressure bolt 4. Hereinafter, each member will be described in detail.

<B> Main Body (FIGS. 1, 3, and 4) The main body 2 is a tubular steel member composed of a storage chamber 21, a female screw portion 22, and a flange portion 23. The outer shape of the main body 2 may be any shape such as a cylinder or a square tube, and is appropriately selected.

The storage chamber 21 is a space for storing a coil spring formed inside the main body 2 and for inserting the rope 5 therethrough. The flange 23 is formed integrally with one of the storage chambers 21.
The diameter of the hole 24 of the flange 23 is larger than the diameter of the rope 5 and smaller than the inner diameter of the inner coil spring 31 of the coil spring. The internal thread portion 22 is formed by threading an internal thread from one part of the storage chamber 21 toward the other.

<C> Inner Coil Spring and Outer Coil Spring (FIGS. 1, 4 to 7) The inner coil spring 31 has an outer diameter larger than an inner diameter of the outer coil spring 32 and an outer diameter of the outer coil spring 32. It is formed smaller than the diameter and the inner diameter is formed larger than the diameter of the rope 5. The outer diameter of the outer coil spring 32 is slightly smaller than the diameter of the storage chamber 21 of the main body 2. For example, a publicly known coil spring or the like is used for both coil springs.
In addition to the case where the inner coil spring 31 and the outer coil spring 32 are combined, one or more middle coil springs may be combined between the inner coil spring 31 and the outer coil spring 32.

<D> Pressure Bolt (FIGS. 1, 3 to 5) The pressure bolt 4 comprises a male thread 41, an enlarged head 42, and an insertion hole 43. A thread 41 is formed on one of the pressure bolts 4 and an enlarged head 42 is formed on the other. The diameter of the male thread portion 41 is formed to be the same as the diameter of the storage chamber 21 of the main body 2. The enlarged head 42 is
Is formed so as to protrude from the other end in the circumferential direction. Enlarged head 4
2 is formed to be at least larger than the diameter of the storage chamber 21 of the main body 2. The planar shape of the enlarged head 42 is a polygon,
The shape may be any shape such as a circle and an ellipse, and is appropriately selected. The insertion hole 43 is formed to penetrate the pressing bolt 4 in the axial direction. The diameter of the insertion hole 43 is formed larger than the diameter of the rope 5 and smaller than the inner diameter of the inner coil spring 31. The end surface of the external thread portion 41 becomes a pressing end surface 44 for pressing the coil spring when the pressing bolt 4 is screwed to the main body 2.

Next, the operation when the shock absorber 1 is installed on the column 6 of the shock absorbing fence will be described. In this example, as shown in FIG. 2, the shock absorbing fence is configured by extending a predetermined number of ropes 5 between columns 6 and installing a wire mesh 7 between the ropes 5.

<A> Supports (FIGS. 2 to 5) The buffer 1 is installed on a predetermined number of mounting members 61 provided on the support 6. The attachment member 61 is provided with two insertion chambers 62 penetrating the inside of the attachment member 61 in the direction in which the rope 5 is stretched, in the circumferential direction of the column 6. The diameter of the insertion chamber 62 is formed larger than the diameter of the main body 2 of the shock absorber 1. Here, the outer peripheral shape of the main body 2 of the shock absorber 1 and the inner peripheral shape of the insertion chamber 62 of the mounting member 61 are polygonal, and the inner peripheral shape of the insertion chamber 62 is made smaller than the outer peripheral shape of the main body 2 of the shock absorber 1. Also, it is preferable to form the buffer member 1 with a slightly larger dimension since the rotation of the shock absorber 1 in the insertion chamber 62 in the circumferential direction can be prevented. The rope 5 of this insertion chamber 62
The contact portion 63 is integrally formed at the end on the extra length portion 51 side. A contact hole 64 is formed in the contact portion 63. The diameter of the communication hole 64 is larger than the diameter of the external thread 41 of the pressure bolt 4 and smaller than the diameter of the enlarged head 42 thereof. An end of the insertion chamber 62 on the side of the contact portion 63 serves as an opening for inserting the main body 2 of the shock absorber 1.

<B> Installation on pillars (FIGS. 1 to 5) The pillars 6 are installed and fixed at predetermined intervals on a slope in a rock fall area. The inner coil spring 31 and the outer coil spring 32 are housed in the main body 2 of the shock absorber 1, and the rope 5 is inserted therethrough. The main body 2 is inserted into the insertion chamber 62 from the opening of the mounting member 61. At this time, the buffer 1 is inserted with its female thread 22 facing the contact portion 63 of the mounting member 61. Insertion hole 43 for pressure bolt 4
The rope 5 is passed through. Then, as shown in FIGS. 3 and 4, the pressure bolt 4 is screwed into the female screw portion 22 of the main body 2 of the shock absorber 1 from the contact portion 63 side of the mounting member 61 and temporarily fixed. A predetermined number of ropes 5 are stretched, and a known wire mesh 7 is installed between the ropes 5. (FIG. 2) The rope 5 is provided with an extra length portion 51 so as to cope with sliding of the rope 5 described later.

<C> Pressing the rope with a shock absorber (FIG. 4)
7) When the pressure bolt 4 is further screwed in, the pressing end of the pressure bolt 4 presses the coil spring. At this time, the outer coil spring 32
However, it contracts by contacting the flange portion 23, and the gap between the spring lines is eliminated. At the same time, the contracted inner coil spring 31 is pushed and displaced in the inner circumferential direction by the outer coil spring 32, and grips the rope 5 and presses it. (FIG. 7) The crimping force of the shock absorber 1 can be easily adjusted by changing the screwing amount of the pressure bolt 4. Thus, the mounting of the shock absorber 1 is completed.

<D> At the time of impact absorption When rockfall collides with the rope 5 of the rockfall prevention fence and the tensile force due to the collision exceeds the crimping force of the shock absorber 1 with respect to the rope 5, the rope 5 crimped inside the main body 2 Slides in the direction of falling rocks. The sliding of the rope 5 absorbs the impact of the falling rock and prevents the falling of the falling rock. The sliding does not apply a tensile force equal to or greater than the set crimping force of the shock absorber 1 to the column 6, so that the column 6 is not plastically deformed by the tensile force of the rope 5.

<E> At the time of maintenance, the maintenance of the rock fall prevention fence after the rock fall is performed by removing the collided rock, loosening the pressure bolt 4 of the shock absorber 1, returning the rope 5 to a predetermined position, and again applying the pressure bolt. It is only necessary to screw 4 in with a predetermined force.

[0018]

[Embodiment 2 of the present invention] On the outer periphery of the main body 2 of the shock absorber 1,
A plurality of hook portions having hook holes penetrating in the axial direction may be formed (not shown). The diameter of the hook hole is formed larger than the diameter of a known connecting member such as a U-shaped bolt penetrating the hook hole. If a U-bolt or the like is connected using this hooking part, it is installed not only in the case of installing on the pillar 6 of the rock fall prevention fence but also in the anchor head protruding from the ground surface of the anchor buried in the slope, for example. For example, the use of the shock absorber 1 is expanded. The pressure bolts 4 and 4 may be screwed into both openings of the main body 2 to reduce the diameter of the plurality of coil springs. When the enlarged head 42 of the pressure bolt 4 comes into contact with the main body 2, the wire diameters of the coil springs 31 and 32 and the rope 5 are adjusted so that a predetermined gripping force is obtained.
If the total length of the male screw portion 41 is set in advance in consideration of the outer diameter of the thread, the torque control of the pressure bolt 4 becomes unnecessary, and the rope 5 can be gripped with a predetermined gripping force.

[0019]

According to the present invention, as described above, the following effects can be obtained. <A> Of the coil springs housed in the shock absorber main body, the innermost coil spring is displaced in the diameter reducing direction, so that the outer peripheral surface of the rope can be gripped with a large gripping force. <B> With a small tightening force of the pressure bolt, a large gripping force can be generated, so that a high cushioning performance can be exhibited. <C> The structure is simple, so that the manufacturing is easy, and the number of components is small, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of a shock absorber according to the present invention.

FIG. 2 is an explanatory view of a shock absorbing fence to which a shock absorber is attached.

FIG. 3 is an explanatory view of a state in which a shock-absorbing device is attached to an impact absorbing fence.

FIG. 4 is an explanatory view showing a state in which the shock absorber is attached to the shock absorbing fence.

FIG. 5 is an explanatory view of a state in which the shock absorber is attached to the shock absorbing fence.

FIG. 6 is an enlarged explanatory view of a storage chamber before screwing a pressure bolt.

FIG. 7 is an enlarged explanatory view of the storage chamber after screwing a pressure bolt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Buffer 2 ... Main body 21 ... Storage room 22 ... Female thread part 23 ... Flange part 24 ... Hole part 31 ... Inner coil spring 32 ... Outer coil spring 4 ... Pressurization Bolt 41 ... male thread part 42 ... enlarged head 43 ... insertion hole 44 ... pressing end face 5 ... rope 51 ... extra length part 6 ... support column 61 ... mounting member 62 ... insertion chamber 63 ..Abutting part 64.Connection hole 7 ... wire mesh

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[Procedure amendment]

[Submission date] May 16, 2000 (2000.5.1)
6)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 2D001 PA06 PB04 PD05 PD10 2D101 CA06 EA02 FA11 FA24 FA34 FB15 GA12 3J048 BC03 BE12 EA38 3J066 AA01 AA22 BA06 CA05 CB10

Claims (2)

[Claims] 1. A tubular main body through which a rope is inserted, a storage chamber formed inside the main body, a screw portion formed in a part of the storage chamber, and a storage part in the storage chamber from the other side of the main body. An outer coil spring and an inner coil spring, a flange formed integrally with one of the main bodies, and a pressing bolt formed with a male threaded part screwed into the other of the main body, an insertion hole and an enlarged head. A shock absorber configured, wherein the inner coil spring has an outer diameter larger than the inner diameter of the outer coil spring and smaller than the outer diameter of the outer coil spring, and has an inner diameter smaller than the diameter of the rope. The outer diameter of the outer coil spring is formed smaller than the diameter of the storage chamber, and the male screw portion is configured to be screwable into the female screw portion of the storage chamber, and is formed on the flange portion. The diameter of the hole is smaller than the diameter of the rope. Larger than the inner diameter of the inner coil spring, the diameter of the insertion hole is larger than the diameter of the rope,
And a shock absorber formed smaller than the inner diameter of the inner coil spring. 2. The shock absorber according to claim 1, wherein a plurality of hooks having hook holes penetrating in the axial direction are formed on an outer periphery of the main body.