JP6123012B1 - Shock absorber - Google Patents

Abstract

A shock absorber that satisfies all the conditions of low cost, small size and light weight, mounting workability, and stable slip tension is provided. A pair of oblique plates (20A, 20B) and a fastening means (30) are provided, the pair of oblique plates (20A, 20B) has a rope accommodating groove (22) and a plurality of pressing projections (23), and the rope accommodating groove (22) Each of the ropes A and B obliquely crossing with the pressing projection 23 is configured to be restrained individually. [Selection] Figure 2

Description

  The present invention relates to a shock absorber that can be applied to a protective net for falling rock protection work or earth and sand collapse prevention work, and in particular, each rope while maintaining a constant tension when the intersection of a plurality of oblique ropes reaches a constant tension. The present invention relates to a shock absorber that can be slidably fastened.

Patent Documents 1 and 2 disclose a protective net formed in a mesh shape by attaching a fastening device to each intersection of crossed ropes.
This fastening device is composed of two clamping plates and four sets of bolts and nuts for fixing between the clamping plates. Two clamping plates are sandwiched from both sides at the intersection of the ropes and fastened with a plurality of bolts and nuts. .
Patent Document 3 discloses a braided protection net knitted in a rhombus mesh without using a fastening device.
This braided protective net is a net-like structure formed by alternately forming a penetration structure in which one of the intersecting ropes is inserted into the other rope and a penetration structure in which the other rope is inserted into the one rope. Is organized.

No. 2002-322615 No. 2002-322616 2010-43436

Conventional protection net manufacturing techniques have the following problems.
<1> In the triangular nets (side length 400 cm, rhombus mesh 20 cm × 40 cm) described in Patent Documents 1 and 2, there are about 160 intersections of ropes in one net, and there are as many fastening devices as the number of intersections. Necessary.
Since the fastening device is large and heavy, not only a large amount of labor and time is required for assembling the fastening device, but also an expensive fastening device causes an increase in the cost of the work protection net.
<2> The fastening devices described in Patent Documents 1 and 2 are difficult to fasten four bolts with uniform torque, and tend to cause variations in fastening force (slip tension) at each intersection of ropes.
<3> In the braided protection net described in Patent Document 3 that is knitted in a rhombus mesh without using a fastening device, it takes a lot of time and labor to knit the net manually.
Furthermore, there is a risk that the rope will be interrupted or freely slipped at the intersection of the ropes, and the rope may be easily damaged by breaking the rope and passing it through another rope.
<4> Conventionally, various friction sliding shock absorbers that are attached to the intersections of orthogonal ropes have been proposed. However, the shock absorbers for the intersections of ropes obliquely crossed at an acute angle and having stable slip tension are still available. Not proposed.

The present invention has been made in view of the above points, and its object is to provide at least one of the following shock absorbers.
<1> To provide a shock absorber having a stable slip tension for an intersection of ropes obliquely crossed at an acute angle.
<2> To produce a shock absorber having a stable slip tension with a small size and light weight and at a low cost.
<3> To prevent damage to the rope due to the contact between the ropes when the rope slips.
<4> Adjustment of slip tension is easy.
<5> Performance confirmation work such as torque management, which is troublesome and troublesome, is unnecessary.

The present invention relates to a damping device for the intersection of oblique two ropes constrained by sandwiching from both sides at a predetermined oblique angle, allowing sliding of the rope exceeds the slip resistance of the rope, the swash交板A pair of oblique plates having the same structure in which a rope accommodating groove capable of independently accommodating the oblique rope is formed in the main body, and both ends of the obtuse angle side of the pair of oblique plates obliquely intersecting the rope accommodating groove Two fastening means for fixing the two portions together, and the rope housing grooves on the opposing surfaces of the oblique plate main body on both sides of the rope housing grooves so as to press the oblique ropes in the separating direction. When a plurality of pressing protrusions that can be inserted into the protrusion are protruded and tightened until the opposing surfaces of the pair of oblique plates contact each other, the ropes that obliquely cross between the rope receiving groove and the pressing protrusion are individually separated. The depth of the rope-receiving groove and the pressing protrusion Projection height is associated.
In another aspect of the present invention, the plurality of pressing protrusions positioned on the contact surfaces on both sides of the rope receiving groove are formed at point-symmetrical positions with respect to the center of the oblique plate main body.
In another embodiment of the present invention, the fastening means is a bolt fastening means, and is an opposing surface of the oblique plate body on both sides of the rope receiving groove, and is point-symmetric with respect to the center of the oblique plate body. A plurality of bolt holes are formed.
In another embodiment of the present invention, a pair of diagonal plates having a rope housing groove and a plurality of pressing projections have the same structure.
In another embodiment of the present invention, the rope receiving groove has a U-shaped cross section, and the groove width and depth are constant over the entire length.
In another embodiment of the present invention, irregularities are formed on the inner peripheral surface of the rope housing groove.
In another embodiment of the present invention, a corner portion of the end portion of the rope receiving groove or the pressing protrusion is chamfered.

The present invention has at least one of the following effects.
<1> A shock absorber having a stable slip tension can be provided for the intersection of ropes obliquely crossed at an acute angle, which has been difficult to realize so far.
<2> Since the pair of diagonal plates constituting the shock absorber has a simple structure with only a rope receiving groove and a pressing projection, the shock absorber having a stable slip tension can be reduced in size and weight and at low cost. Can be produced.
<3> Since the oblique plates have the same structure, there is no need to use a pair of oblique plates separately during component management or assembly.
Therefore, as compared with the case where two types of oblique crossing plates having different structures are used properly, the assembling work of the oblique crossing plates is simplified, and the manufacturing cost of the oblique crossing plates can be greatly reduced.
Further, when the oblique plate is manufactured by forging or casting, only one type of mold is required.
<4> Since the ropes obliquely intersected by the plurality of pressing protrusions are separated from each other, it is possible to reliably prevent the rope from being damaged due to the contact between the ropes when the rope slips.
<5> If the corner portion of the end of the rope housing groove or the pressing protrusion is chamfered, damage to the rope during rope slip can be reduced.
<6> The slip tension can be easily adjusted by selecting the protrusion height of the pressing protrusion.
<7> A predetermined slip tension can be obtained simply by tightening the opposing surfaces of the pair of oblique plates until they come into contact with each other, so that it is not necessary to perform performance confirmation work such as torque management of a bolt that is troublesome and troublesome.

Partial enlarged view of a protective net with a shock absorber Overall perspective view of the shock absorber according to the present invention in which a part of the rope is omitted. Top view of diagonal plate containing rope Perspective view of diagonal plate Cross-sectional view of the shock absorber for explaining the relationship between the rope housing groove and the ropes A and B obliquely intersecting the pressing protrusion Sectional view of VI-VI in FIG. Illustration of protective net with shock absorber applied to triangular net panel

  Embodiments of the present invention will be described with reference to the drawings.

<1> Protective Net Describing with reference to FIG. 1, the protective net 50 includes a plurality of obliquely crossing ropes A and B and a plurality of shock absorbers 10 attached at the intersections of the two obliquely crossed ropes A and B. The mesh 51 has a vertically long rhombus.
The shock absorber 10 according to the present invention has a function as a gripping tool for fixing the intersection of two ropes A and B that are obliquely crossed without being orthogonal, and a constant slip on each rope A and B while allowing slip (sliding). It is a device that also has a function as a shock absorber that applies tension (slip resistance), and functions to enhance the shock absorbing performance of the protective net 50.
The “slip tension” refers to the tension of the ropes A and B when the ropes A and B start slipping when reaching a certain tension, and slip while maintaining the tension.

  Each of the ropes A and B includes a steel rope, a resin rope, a fiber rope, or a composite thereof.

In this example, a description is given of a case where the oblique angle θ ₁ of the ropes A and B is obliquely inclined at 60 degrees, but the oblique angle θ ₁ of the ropes A and B may be an angle other than 60 °.

<2> Outline of Shock Absorber Referring to FIGS. 2 to 4, the shock absorber 10 is a pair of plates that can sandwich the intersecting points of the oblique ropes A and B from both sides. A pair of oblique plates 20A, 20B having a rope accommodating groove 22 capable of individually accommodating the ropes, and a plurality of pressing projections 23 for pressing the ropes A, B in the separating direction, and these oblique plates 20A, 20B. And fastening means for fixing together.
In the present invention, the rope housing groove 22 having a non-tapered structure and a plurality of pressing protrusions 23 are combined in order to achieve both the problem of manufacturing cost and the problem of stabilization of slip tension.
Hereinafter, the configuration of the shock absorber 10 will be described in detail.

<3> Oblique plate In this example, since the oblique plate 20A that accommodates one rope A and the oblique plate 20B that accommodates the other rope B have the same structure, one oblique plate 20A will be described. A description of the other oblique plate 20B is omitted.

Referring to FIGS. 3 and 4, the oblique plate 20 </ b> A includes one rope receiving groove 22 that traverses through the center P of the oblique plate main body 21, and the oblique plates on both sides with the rope containing groove 22 interposed therebetween. A plurality of pressing projections 23, 23 projecting from the opposing surface 25 of the intersecting plate main body 21, and at positions spaced from the pressing projection 23, drilled on both sides of the oblique intersecting plate main body 21 with the rope housing groove 22 interposed therebetween. Two bolt holes 24, 24 are provided.
In this example, for the sake of weight reduction, the cross-sectional shape of the oblique plate 20A is shown in a substantially hat shape, but the cross-sectional shape of the oblique plate 20A is not limited to the illustrated shape, and the oblique plate The 20 planar shape is not particularly limited.

<3.1> Rope Housing Groove The rope housing groove 22 has a U-shaped cross section, and the groove width and depth are constant over the entire length.
The depth of the rope housing groove 22 is the same as the diameter of the ropes A and B. The groove width is equal to the diameter of the ropes A and B in the upper half of the housing groove and the diameter of the ropes A and B in the lower half. It presents an equal semicircle.
In this example, a description will be given of a form in which the depth of the rope accommodating groove 22 is made the same as the diameter of the ropes A and B so that the entire cross section of the ropes A and B can be accommodated in the rope accommodating groove 22. May be formed larger than the diameter of the ropes A and B.
The point is that the ropes A and B have a depth that does not protrude from the rope housing groove 22 when the oblique plates 20 and 20 are brought into contact with each other and the protrusions press the ropes A and B. .
In order not to damage the ropes A and B, the corners at both ends of the rope housing groove 22 are preferably chamfered and rounded.
In addition, if unevenness | corrugation is formed in the inner peripheral surface of the rope accommodation groove | channel 22, slip resistance with the ropes A and B can be raised.

Since the oblique plates 20A and 20B can be used as a single type of oblique plate, not only can the configuration of the shock absorber 10 be simplified, but the oblique plates 20A and 20B do not have a complicated shape or structure, and can accommodate the rope. Since the groove 22 has a simple structure in which the groove width and depth are constant, it can be manufactured at a low cost by forging or casting, for example.
When the oblique plates 20A and 20B are manufactured by forging or casting, only one type of formwork may be used.
In this example, one side of the oblique plates 20A and 20B can be manufactured with 30 mm and a single mass of 100 g or less.

The conventional shock absorber cannot cope with the ropes A and B obliquely crossed at an acute angle.
Furthermore, the size of the conventional shock absorber for the orthogonal rope was small, but the length was several tens of cm and the width was 5 to 10 cm.
In the shock absorber 10 of the present invention, for example, when it is attached to the ropes A and B having a diameter of 12 mm, even when the pair of diagonal plates 20A and 20B are combined, the dimensions are about 3 cm in length and width and about 3.2 cm in thickness, thereby reducing the size and weight. realizable.

<3.2> Modified Example of Rope Housing Groove In this example, a case where ropes A and B have the same diameter will be described, but each rope A and B may have a combination of different diameters. Also in this case, the groove width and depth of each rope receiving groove 22 are set to dimensions that can accommodate the entire cross sections of the ropes A and B having different diameters.

<3.3> Pressing Protrusions As shown in FIGS. 3 and 4, a plurality of pressing protrusions 23, 23 project from the opposing surfaces 25 of the diagonal plate body 21 on both sides of the rope housing groove 22.
As shown in FIG. 5, the pressing protrusion 23 is a ridge that functions to restrain the ropes A and B in cooperation with the rope housing hole 22, and can be inserted into the opposing rope housing groove 22. .
By selecting the protrusion height of the pressing protrusion 23, the slip tension of the ropes A and B can be controlled.

<3.3.1> Forming Position of Pressing Protrusion As shown in FIG. 3, the pressing protrusions 23 and 23 are formed at point-symmetric positions with respect to the center P of the oblique plate main body 21.
That is, the oblique angle θ _{2 of the} line connecting the center line of the rope A and the center of the pair of pressing protrusions 23 and 23 is equal to the oblique angle θ ₁ of the ropes A and B, and the oblique plate 20A is 180 degrees. When rotated, the pressing protrusions 23 and 23 return to their original positions.
Oblique angle theta ₂ rope A pair of pressing projections 23 and 23 in this example, becomes the oblique angle theta ₁ is equal 60 degrees B, oblique angle theta ₂ of the pair of pressing projections 23, 23 to 60 degrees The angle is not limited, and any angle may be used as long as the ends of the pair of obliquely accommodating rope housing grooves 22 and 22 do not overlap each other.

<3.3.2> Shape of Pressing Protrusion The pressing protrusions 23, 23 of the oblique plates 20A, 20B are formed in a direction orthogonal to the longitudinal direction of the opposing ropes A, B.
In this example, the pressing protrusion 23 has a rectangular cross section or a trapezoidal cross section, and shows a form in which the pressing protrusion 23 is raised in a ridge shape having a uniform height. , B can be determined as appropriate according to the desired slip tension.
In order not to damage the ropes A and B, it is advisable to chamfer the corners at both upper ends of the pressing protrusion 23 so as to be rounded. The pressing protrusion 23 may have any shape that makes it difficult for the ropes A and B to be damaged during slipping.

In this example, the pressing protrusion 23 has a uniform height and the top surface is formed flat, but the top surface of the pressing protrusion 23 may be formed as an arcuate surface that is recessed along the longitudinal direction of the protrusion. By forming the top surface of the pressing projection 23 into a concave arcuate surface, the contact area with the outer peripheral surface of each of the ropes A and B serving as slip resistance surfaces can be increased.
It is desirable that the curvature (curvature radius) when the top surface of the pressing projection 23 is formed as a concave arc surface be larger than the curvature of the groove bottom of the rope housing groove 22.

<3.3.3> Dimensional relationship between the pressing protrusion and the rope receiving groove The pressing protrusion 23 has a total length (horizontal width) that can be inserted into the rope receiving groove 22, but between the entire length of the pressing protrusion 23 and the rope receiving groove 22. When the gap formed becomes large, the strands of the ropes A and B enter the gap.
In order to avoid damage to the strands of the ropes A and B, the gap between the rope housing groove 22 and the pressing projection 23 is set to be equal to or smaller than the diameter of the ropes A and B.

<3.4> Bolt Holes Two bolt holes 24, 24 are formed on both sides of the diagonal plate body 21 with the rope housing groove 22 in between.

<3.4.1> Position of Bolt Hole Formation The pair of bolt holes 24, 24 are also formed at point-symmetrical positions with respect to the center P of the oblique plate main body 21 in the same manner as the pressing projections 23, 23. However, it is formed at a position where it does not interfere with the pressing protrusions 23, 23 and the rope housing grooves 22, 22.
In other words, the oblique plate body 25 is formed by combining the pressing protrusions 23 and the bolt holes 24 on the contact surfaces 25 on both the left and right sides of the rope housing groove 22, and the contact surface 25 on one side of the rope housing groove 22. Is formed by a combination of a pressing projection 23 and a bolt hole 24.

<3.5> Relationship Between Depth of Rope Housing Groove and Protrusion Height of Pressing Projection In the present invention, each rope is tightened until the opposing surfaces 25, 25 of the pair of oblique plates 20A, 20B are in contact with each other. The depth of the rope receiving groove 22 and the protruding height of the pressing protrusion 23 are such that the ropes A and B obliquely intersecting between the receiving groove 22 and the pressing protrusion 23 are individually restrained to obtain a predetermined slip tension. It is related.

<4> Fastening means In this example, the case where the fastening means of the shock absorber 10 is a combination of a pair of tightening bolts 30 and nuts 31 will be described. However, the nuts are omitted and only the tightening bolts 30 are screwed and fixed. May be.
The number of tightening bolts 30 used is not limited to two in this example, and can be selected as appropriate.
The fastening means is not limited to bolt fastening, and various known fastening means can be applied.

[Mounting method of shock absorber]
Next, a method for attaching the shock absorber 10 will be described.

<1> Accommodation of ropes The ropes A and B are accommodated in the respective rope accommodation grooves 22 of the oblique plates 20A and 20B.
Since the groove width of the rope housing groove 22 having a U-shaped cross section is formed to be approximately the same diameter as the ropes A and B, the ropes A and B can be housed in the rope housing grooves 22 and 22 without resistance. B can be accommodated easily in a short time.

<2> swash交板butt rope A, B is such that oblique at a predetermined oblique angle theta _1, the facing surfaces 25 are opposed butting a pair of oblique交板20A, 20B.
In addition to the method in which the oblique plates 20A and 20B are brought into contact with each other with the ropes A and B accommodated, the oblique plates 20A and 20B can be attached so as to be sandwiched from both sides of the oblique ropes A and B. Good.

<3> buffer device 10 according to the engagement present invention of a pair of oblique交板are rope A, oblique交板20A, 20B of the bolt holes 24, 24 when B was allowed interlinked obliquely at a predetermined oblique angle theta ₁ Therefore, the tightening bolts 30 are inserted into the bolt holes 24 and 24 that have been aligned and tightened.

<4> Rope tightening mechanism The tightening mechanism of the ropes A and B that are obliquely crossed by the shock absorber 10 will be described.
5 and 6 are cross-sectional views of a convenient shock absorber 10 that facilitates understanding of the relationship between the rope receiving grooves 22 and the pressing protrusions 23 of the pair of oblique plates 20A and 20B and the oblique ropes A and B. FIG. is there.
In the following, “a” is added to the end of the reference numerals of the constituent elements related to the oblique board 20A so that the constituent elements of the respective oblique boards 20A and 20B can be distinguished, and the reference numerals of the constituent elements related to the oblique board 20B. An explanation will be given with “b” added to the end.

A pair of oblique交板20A, rope receiving groove 22a of 20B, 22b rope A, the oblique to interlinked in accordance with the oblique angle theta ₁ of B, only oblique交板20A, bolt holes 24, 24 and 20B match Instead, the pair of pressing projections 23a, 23a and 23b, 23b are located at positions where they can be inserted into the respective rope housing grooves 22a, 22b.
In other words, the oblique projection plate 23b of the oblique plate 20B is located opposite to the open side of the rope accommodation groove 22a of the oblique plate 20A that accommodates one rope A, and the oblique plate that accommodates the other rope B. On the open side of the rope housing groove 22b of 20B, the pressing protrusion 23a of the oblique plate 20A is located facing.
In this state, when the opposing surfaces 25a and 25b of the oblique plates 20A and 20B are tightened until they come into contact with each other, the rope A is compressed between the rope receiving groove 22a and the pressing projection 23b, and the cross-sectional area of one rope A is reduced. Similarly, it is compressed between the rope housing groove 22b and the pressing projection 23a, and the cross-sectional area of the other rope B is reduced.
A pair of pressing projections 23a, 23a and 23b, 23b bite into two locations on the outer peripheral surfaces of the ropes A, B and press them.
Since there is no escape space for the ropes A and B in the rope housing grooves 22a and 22b, the ropes A and B are sandwiched between the inner peripheral surfaces of the rope housing grooves 22a and 22b and the pressing protrusions 23a, 23a and 23b, 23b. And the restraint state is maintained.

  As described above, a shock absorber is provided at the intersection of the ropes A and B that are obliquely crossed by a simple operation of simply sandwiching the ropes A and B between the pair of diagonal plates 20A and 20B and tightening the two bolts 40. 10 can be attached.

[Slip operation of shock absorber]
The slip operation of the shock absorber 10 will be described with reference to FIGS.

<1> Slip operation When a tensile force acts on one or both of the ropes A and B, the tensile force is transmitted to the outer peripheral surfaces of the ropes A and B and the pressing protrusions 23a, 23a, 23b, and 23b.
When the tensile force exceeds the slip resistance between the circumferential surfaces of the ropes A and B that have undergone compression deformation, the ropes A and B start to slip in the pulling direction.
For example, the behavior of the slip of one rope A in the shock absorber 10 will be described. On the entrance side of the rope A, although the cross-sectional area passes through the portion where the cross-sectional area is reduced by the one pressing protrusion 23b, the cross-sectional area increases once. At the exit of the rope A, it must pass again through the portion where the cross-sectional area is reduced by the one pressing projection 23b.
During this time, a large friction is generated in the reduced area of the cross-sectional area, and the energy originally possessed by the rope A is dissipated as heat energy, so that a stable slip tension can be obtained.
The slip behavior of the other rope B in the shock absorber 10 is the same as the one rope A described above.

For example, it is possible to slip an oblique rope by gripping it in a tapered gripping hole, but in the case of a tapered gripping hole, the slipping direction of the rope is restricted to one direction.
On the other hand, in the present invention, the shock absorber 10 has two pairs of pressing projections 23a, 23a and 23b, 23b that are separated from each other, so that the slip directions of the oblique ropes A, B are not restricted. .

<2> Rope separation action If the intersecting point of the diagonally intersecting ropes A and B is sandwiched between a pair of plates, the oblique ropes A and B come into direct contact with each other and the ropes A and B become intense when a slip occurs. Damaged.
In the shock absorber 10 of the present invention, the pair of pressing protrusions 23a, 23a and 23b, 23b press the ropes A, B in the separating direction, so that the ropes A, B are not in contact with each other and the ropes A, B are damaged. Can be avoided.
Further, although a shock absorber in which a separate insulating plate is interposed between the ropes A and B is known, in the present invention, the oblique ropes A and B can be separated without interposing the insulating plate.

[Usage example of shock absorber]
FIG. 7 shows a protective net 50 composed of a combination of a plurality of net panels 52 exhibiting an upright triangle and an inverted triangle, and shows a form in which the shock absorber 10 is applied to the net panel 52.
The net panel 52 is a combination of a frame rope 53 having a triangular shape, a plurality of ropes A and B obliquely crossed inside the frame rope 53, and a plurality of shock absorbers 10 attached to the intersections of the oblique ropes A and B. The mesh has a long rhombus.
Adjacent net panels 52 are connected by a rope-like connecting material 54.
By using the shock absorber 10 of the present invention, it is possible to reliably and easily manufacture the net panel 52 having a triangular shape at a low cost.
Since the mounting method and slip operation of the shock absorber 10 in this example are the same as those of the shock absorber 10 described above, description thereof is omitted.

A, B ··· rope 10 ··· shock absorber 20A · · · oblique plate 20B · · · oblique plate 21 · · · oblique plate body 22, 22a, 22b · · · Rope receiving grooves 23, 23a, 23b ... pressing protrusions 24 ... bolt holes 25, 25a, 25b ... facing surfaces 30 ... tightening bolts 31 ... nuts 50 ... ... Protective net 51 ... Mesh 52 ... Frame rope 54 ... Connecting material

Claims (7)

The intersection of the oblique two ropes constrained by sandwiching from both sides at a predetermined oblique angle, a damping device that allows slippage exceeds the slip resistance of the rope the rope,
A pair of oblique plates having the same structure in which a rope housing groove capable of independently accommodating the oblique rope is formed in the oblique plate body;
Two fastening means for integrally fixing the two ends of the obtuse angle side of the pair of oblique plates in which the rope housing grooves are obliquely crossed;
A plurality of pressing protrusions that can be inserted into the rope receiving grooves are provided on the opposing surfaces of the oblique plate main body on both sides of the rope receiving grooves so as to press the oblique ropes in the direction away from each other.
When the opposing surfaces of the pair of diagonal plates are tightened until they come into contact with each other, the depth of the rope receiving groove and the pressure are set so that each rope obliquely crossed between the rope receiving groove and the pressing projection can be individually restrained. The protrusion height of the protrusion is related,
Shock absorber.   2. The buffer according to claim 1, wherein the plurality of pressing protrusions positioned on the contact surfaces on both sides of the rope receiving groove are formed in point-symmetric positions with respect to the center of the oblique plate main body. apparatus.   The fastening means is a bolt fastening means, and a plurality of bolt holes are formed on opposite surfaces of the oblique plate main body on both sides of the rope receiving groove, and are point-symmetric with respect to the center of the oblique plate main body. The shock absorber according to claim 1, wherein:   The shock absorber according to any one of claims 1 to 3, wherein the pair of diagonal plates having the rope housing groove and the plurality of pressing protrusions have the same structure.   The shock absorber according to any one of claims 1 to 4, wherein the rope receiving groove has a U-shaped cross-section, and the groove width and depth are constant over the entire length thereof. .   The shock absorber according to any one of claims 1 to 5, wherein irregularities are formed on an inner peripheral surface of the rope housing groove.   The shock absorber according to any one of claims 1 to 6, wherein a corner portion of the end portion of the rope housing groove or the pressing protrusion is chamfered.

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