JP2018031173A - Buffer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer that fulfills all conditions, that is, inexpensiveness, a small size and light weight, mounting workability, and stable slip tension.SOLUTION: A buffer comprises a buffer tool body 20 that has a rope storage groove 22 of an untapered structure, a push-in plate 30 for closing the rope storage groove 22, and fastening means 50. A wedge-shaped belt-like wedge body 31 is provided on one side of the push-in plate 30. Constricted holes 40A and 40B having a cross-sectional area gradually decreased toward a rope outlet side from a rope inlet side are formed between the rope storage groove 22 and an inclined restraining surface 31a formed on the belt-like wedge body 31.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shock absorber that slidably restrains one or more ropes.

Patent Document 1 discloses a protective net composed of an assembly of a plurality of single wheels that form a loop shape by combining a plurality of ropes and a plurality of shock absorbers.
This protective net has a structure in which a single ring is formed by attaching a shock absorber to the overlapping part of the rope, and the adjacent single ring has continuity, and an endless ring body made of rope is engaged. Compared to a protective net formed in a chain (Patent Document 2), the net is superior in many aspects such as the impact absorption performance and cost of the entire net.
For example, in the case of manufacturing a protective net having a single wheel diameter of 30 cm, a span of 10 m, and a height of 4 m, the protective net of Patent Document 1 requires 66 shock absorbers in a horizontal row, and 880 in 13 rows of the entire net. Requires as many shock absorbers.

  In general, when a certain tension is applied to the rope, slip resistance type shock absorbers that allow the rope to slide while maintaining that tension are often used in protective measures such as falling rocks or avalanches, and the slip tension is about 150 kN. The slip tension generally used is in the range of 40 to 80 kN.

Patent Document 3 discloses a shock absorber provided with a pair of gripping plates that grip two ropes and two sets of high-strength bolts that pass through and fix both ends of the pair of gripping plates.
Two receiving grooves each having a semicircular cross section are recessed in the opposing surface of each gripping plate, and the outer peripheral surfaces of the two ropes received in each receiving groove are tightened with two sets of high-strength bolts. ing.
In the shock absorber described in Patent Document 3, when a rope is tightened, some strands of the rope protrude from the gap between the opposing surfaces of the pair of gripping plates, and the entire rope can be completely accommodated in the groove. Can not. For this reason, when the rope is pulled, the strand of the rope is broken and a stable slip tension cannot be obtained.
Furthermore, since the shock absorber described in Patent Document 3 has a size of 10 cm square, a heavy weight of several kilograms, and a high price, it is difficult to use it for a protective net combining loop-shaped single wheels. It is.

Patent Document 4 discloses a shock absorber in which an outer cylinder that can accommodate two ropes and an insertion cylinder that is inlay-fitted to the outer cylinder are combined.
Although the shock absorber disclosed in Patent Document 4 is small and light, the cost is still high, and there is room for improvement in mounting workability.

No. 2015-200086 (FIGS. 1 and 2) JP-A-10-88527 No. 2014-227893 (FIGS. 12 and 13) Japanese Unexamined Patent Publication No. 2006-89479 (FIG. 1)

The present invention has been made in view of the above points, and the objectives thereof are low cost, small size and light weight, good mounting workability, and stable slip tension. The purpose of the present invention is to provide a shock absorber that satisfies all the requirements of the above.
Still another object of the present invention is to provide a shock absorber suitable for use in a protective net composed of an assembly of a plurality of single wheels that form a loop by combining a plurality of ropes and a plurality of shock absorbers.

The present invention is a shock absorber that restrains one or a plurality of ropes in a slidable manner and allows the ropes to slip when the rope slip resistance is exceeded, and a shock absorber body having a rope housing groove that can accommodate the ropes And a push plate capable of closing the rope housing groove of the shock absorber main body and narrowing down the rope, and a fastening means for fixing the shock absorber main body and the push plate integrally, and the rope on one side of the push plate A wedge-shaped band-shaped wedge body that can be inserted into the receiving groove is provided, and the band-shaped wedge body is formed so that a protruding height gradually increases from the rope inlet side to the rope outlet side, and the pushing plate is used as the buffer. When abutting, a throttle hole is formed between the inclined restraint surface formed on the side surface of the belt-like wedge body and the rope housing groove so as to contact and restrain the outer peripheral surface of the rope, and the cross-sectional area of the throttle hole is From the rope entrance side to the rope exit side Only and are formed so as to gradually decrease.
In another embodiment of the present invention, a plurality of throttle holes are provided between the shock absorber main body and the pushing plate.
In another embodiment of the present invention, the belt-like wedge body has a uniform lateral width over the entire length, and the slanting restraint surface of the belt-like wedge body is inclined along the rope housing groove.
In another embodiment of the present invention, a plurality of belt-like wedge bodies are provided in a column along one side of the push plate along the rope housing groove.
In another embodiment of the present invention, the maximum raised height of the plurality of band-shaped wedges is increased stepwise from the rope inlet side to the rope outlet side of the throttle hole.
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 at least one of the inner peripheral surface of the rope housing groove of the shock absorber main body or the inclined restraining surface of the belt-like wedge body.
In another embodiment of the present invention, a corner portion of the end portion of the rope housing groove or the inclined restraint surface is chamfered.
In another embodiment of the present invention, the difference in dimension between the groove width of the rope-receiving groove and the lateral width of the belt-like wedge body so that the rope strands do not enter the gap formed between the rope-receiving groove and the belt-like wedge body. Is less than the diameter of the rope strand.

The present invention has the following effects.
<1> Since both the shock absorber body and the pushing plate have a simple structure, they can be manufactured at low cost.
Since the rope housing groove of the shock absorber main body can accommodate the entire cross section of the rope, the rope can be accommodated easily.
Since the rope can be restrained through the throttle hole formed without forming the rope housing groove of the shock absorber main body into a tapered structure, a stable slip tension can be obtained, so that the shock absorber can be reduced in size and weight.
Therefore, it is possible to provide a shock absorber that satisfies all the conditions of low cost, small size and light weight, mounting workability, and stable slip tension, which have been difficult to achieve until now.
<2> The rope slips because the end of the throttle hole is chamfered and the strands constituting the rope do not enter the gap formed between the rope housing groove and the belt-like wedge body. When doing so, the rope is less likely to be damaged or broken.
<3> It is suitable as a shock absorber for a protective net composed of an assembly of a plurality of single wheels that form a loop shape by combining a plurality of ropes and a plurality of shock absorbers.
<4> The required slip resistance of the rope can be adjusted by selecting the raised height (projection height) of the belt-like wedge body.
<5> A plurality of belt-like wedge bodies that are pushed into a row of rope-receiving grooves are provided in one row on one side of the pushing plate, and the maximum rising height of the plurality of belt-like wedge bodies is increased stepwise, thereby dramatically increasing the sliding tension. And the damage to the rope can be minimized.
<6> Torque management or the like is not required to obtain the required rope slip resistance as found in conventional shock absorbers.

Overall perspective view of the shock absorber according to the present invention in which a part of the rope is omitted. Disassembled assembly drawing of shock absorber Sectional view of III-III in Fig. 1 Sectional view of IV-IV in FIG. Partial expanded sectional view of VV in FIG. Vertical section of shock absorber according to another embodiment Illustration of forming a protective net for a protective fence by assembling multiple ropes and shock absorbers

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

<1> Outline of Shock Absorber Referring to FIGS. 1 and 2, the shock absorber 10 according to the present invention allows ropes A and B while allowing one or a plurality of ropes A and B to slide (slip). This is a squeezing type braking device that imparts a constant slip resistance (slip tension) to the motor.
“Slip resistance” refers to the tension of the ropes A and B when the ropes A and B start to slip when the ropes A and B reach a certain tension and slip while maintaining the tension.
In this example, a mode in which the shock absorber 10 holds two ropes A and B having different tensile directions A ₁ and B ₁ will be described. However, the present invention can be applied even if the number of ropes is one or three or more. is there.
The ropes A and B include a steel rope, a resin rope, a fiber rope, or a composite thereof.

<2> Shock Absorber The shock absorber 10 includes a shock absorber main body 20 that accommodates the ropes A and B, a push plate 30 that blocks the opening of the shock absorber main body 20 and can narrow the ropes A and B, and these shock absorbers. Fastening means for fixing the main body 20 and the pushing plate 30 together is provided.

Between the opposing surfaces of the shock absorber main body 20 and the push-in plate 30, two throttle holes 40A and 40B are formed which can abut against the outer peripheral surfaces of the ropes A and B and can be restrained.
The cross-sectional area of each throttle hole 40A, 40B is formed so as to gradually decrease from the rope inlet side toward the rope outlet side, and exceeds the slip resistance between the throttle holes 40A, 40B and the outer peripheral surfaces of the ropes A, B. And allow the ropes A and B to slip.

<3> Shock absorber body Referring to FIG. 2, the shock absorber body 20 is a plate having a uniform thickness that can accommodate the ropes A and B, and a partition wall 21 is sandwiched between one side of the plate. The same number of rope receiving grooves 22 and 22 as the ropes A and B are provided side by side.
Bolt holes 23 and 23 are provided at both ends of the shock absorber main body 20 with the rope housing grooves 22 and 22 interposed therebetween.

<3.1> Rope Housing Groove Each rope housing groove 22 has a U-shaped cross section, and the groove width and depth are constant over the entire length.
The groove width of the rope accommodating groove 22 is formed to be substantially equal to the diameter of each rope A, B in consideration of the accommodating workability of each rope A, B.
The depth of each rope receiving groove 22 may be the same as or larger than the diameter of each rope A, B. In short, when the pushing plate 30 is pushed, a part of each rope A, B is What is necessary is just to have the depth which can be accommodated so that it may not protrude from the rope accommodating grooves 22 and 22.
In order not to damage the ropes A and B, the corners at both ends of each rope receiving groove 22 are preferably chamfered 24 and rounded.
The shock absorber main body 20 does not have a complicated shape or structure, and has a simple structure in which the rope receiving groove 22 has a constant groove width and depth, and therefore can be manufactured at low cost.
The shock absorber main body 20 can be manufactured, for example, by casting or cutting.
Although the size of the conventional shock absorber is small, the length is several tens of centimeters and the width is 5 to 10 cm. However, in the shock absorber 10 of the present invention, the length and width are about 5 to 6 cm and the thickness is about 2.5 cm. Smaller and lighter can be realized.

<3.2> Modified Example of Rope Housing Groove In this example, the case where the ropes A and B have the same diameter will be described, but the ropes A and B may have a combination of different diameters. Also in this case, the width and depth of the rope housing grooves 22 and 22 are set so as to accommodate the entire cross section of the ropes A and B having different diameters.

<4> Pushing plate If it demonstrates with reference to FIG. 2, the rope accommodation groove | channel is not provided in the pushing plate 30 side in this invention, The strip | belt-shaped wedge body 31 corresponding to the rope accommodation groove 22 on the single side | surface of the pushing plate 30, 31 are juxtaposed.
Each of the wedge-shaped wedge bodies 31 and 31 is a wedge-shaped protrusion that can be inserted into the rope housing grooves 22 and 22 to press the ropes A and B, and is formed along the tension direction of the ropes A and B. .
Bolt holes 32 and 32 are provided at both ends of the pressing plate 30 with the belt-like wedge bodies 31 and 31 therebetween.
The pushing plate 30 does not have a complicated shape or structure, and can be manufactured at a low cost because of the simple structure in which the band-like wedges 31 and 31 protruding on one side of the plate are integrally formed.
The pushing plate 30 can be manufactured by casting or cutting, for example.

<4.1> Band-shaped wedge bodies The band-shaped wedge bodies 31, 31 are uniform in width over the entire length, but from the surface of the pushing plate 30 toward the rope outlet side from the rope inlet side of each throttle hole 40A, 40B. The cross-sectional shape with the bulging height (thickness) gradually increasing has a wedge shape.
In other words, the raised heights of the belt-like wedge bodies 31 and 31 are gradually increased in the pulling direction of the ropes A and B.
Although the present embodiment shows a form in which the slopes of the belt-like wedge bodies 31 and 31 are constant, the slope of the belt-like wedge bodies 31 and 31 is not limited to being constant.
The rope exit side of the belt-like wedge body 31 is most bulged, and the maximum raised height is ½ or less of the diameters of the ropes A and B. This is because the height of the vertical wall of the rope housing groove 22 is the radius of the diameters of the ropes A and B.
In addition, by selecting the maximum raised height of the belt-like wedge body 31, the required slip resistance of the ropes A and B can be set, and the maximum raised height of the belt-like wedge body 31 is the cross section of each rope A and B. Select in consideration of porosity and the like.
The rope entrance side of the belt-like wedge body 31 may be formed flush with the surface of the pushing plate 30 or may be formed by biting into the inside of the pushing plate 30.
In short, the sectional area of each throttle hole 40A, 40B is the largest on the rope inlet side, the sectional area gradually decreases from the rope inlet side to the rope outlet side, and is closest to the rope outlet of the throttle holes 40A, 40B. It is getting smaller.

<4.2> Reason why the belt-like wedge body is wedge-shaped The reason why the wedge-like belt-like wedge body 31 is formed on the pressing plate 30 side is that the rope accommodating groove has a non-tapered structure in which the groove width and depth are constant over the entire length. This is because the aperture holes 40A and 40B equivalent to the taper structure are economically formed using the No. 22.

For example, it is conceivable to form a taper shape by changing the groove width and depth of the rope housing groove on the shock absorber main body 20 side, and to accommodate and restrain the rope in the tapered rope housing groove.
When forming the rope housing groove in a tapered shape, it is necessary to form the smaller diameter side of the rope housing groove smaller than the rope diameter, so it is very difficult to push the rope into the tapered rope housing groove. In addition to this, there is a problem that the processing cost for making the rope housing groove tapered increases.

  In the present invention, in order to achieve both the housing operation of the ropes A and B and the problem of manufacturing cost, the rope housing groove 22 having a non-tapered structure formed on the shock absorber main body 20 side and the wedge-shaped belt-like wedge formed on the pushing plate 30 side are provided. The body 31 is combined.

<4.3> Inclination Constraint Surface A continuous inclination constraint surface 31 a is formed on the side surface of each belt-like wedge body 31.
The inclined restraint surface 31a is inclined toward the tension direction of the ropes A and B, and the cross-sectional shape thereof is formed as a circular arc surface that is recessed so as to be in contact with the outer peripheral surfaces of the ropes A and B.
The curvature radius of the inclined restraint surface 31 a is formed to be larger than the curvature radius of the groove bottom of the rope housing groove 22. This is to make the contact between the outer peripheral surfaces of the ropes A and B deformed by being crushed and deformed in the rope housing groove 22 and the inclined restraining surface 31a when the shock absorber 10 is assembled.
In order not to damage the ropes A and B, the corners at both ends of each inclined restraint surface 31a may be chamfered 33 to be rounded.

  The inner peripheral surface of the rope housing groove 22 of the shock absorber main body 20 and the inclined restraining surface 31a of the pushing plate 30 may be smooth surfaces, but at least one of the inner peripheral surface of the rope housing groove 22 or the inclined restraining surface 31a. If unevenness is formed on the surface, the slip resistance with the ropes A and B can be increased.

<4.4> Positional relationship of the belt-like wedge bodies Since the pulling directions A ₁ and B _{1 of the} ropes A and B are opposite directions, the slope direction of the slope restraint surfaces 31a of the belt-like wedge bodies 31 and 31 adjacent to each other is The positional relationship is reversed.
In other words, the narrowing directions of the ropes A and B are opposite to each other in the throttle holes 40A and 40B.

<4.5> Dimensional relationship between throttle hole and rope diameter A plurality of independent throttle holes 40A and 40B between the rope housing grooves 22 and 22 of the shock absorber main body 20 and the inclined restraining surfaces 31a and 31a of the pushing plate 30 are separated and independent. Is formed.
The cross-sectional areas of the throttle holes 40A and 40B are formed so as to gradually decrease from the rope inlet side toward the rope outlet side.
The dimensional relationship between the throttle holes 40A and 40B and the rope diameter will be described with reference to FIG.
Dimensional relationship of d ₂ <D ≦ d ₁ where D is the diameter of each rope A and B, d _{1 is} the maximum diameter on the rope inlet side of each throttle hole 40A and 40B, and d ₂ is the minimum diameter on the rope outlet side. It is in.
The restraining force of the ropes A and B by the throttle holes 40A and 40B is obtained from the maximum raised height and the gradient of the belt-like wedge bodies 31 and 31.
Therefore, when the pushing plate 30 is tightened until it comes into contact with the shock absorber main body 20, the depth of the rope housing groove 11 and the maximum of the belt-like wedge bodies 31 and 31 can be applied to the ropes A and B. The raised height h and the slope are related.
The slip tension (slip resistance) of the ropes A and B can be adjusted by appropriately selecting the depth of the rope housing groove 11 and the maximum raised height h and gradient of the belt-like wedge bodies 31 and 31.

<4.6> Dimensional relationship between the belt-like wedge body and the rope housing groove Referring to FIG. 5, the dimensional relationship between the belt-like wedge body 31 and the rope housing groove 22 will be described because the belt-like wedge body 31 enters the rope housing groove 22. groove width L ₁ of the rope receiving groove 11 is in a lateral width L ₂ less than the dimensional relationship of the belt-shaped wedge member 31 in.
When the gap G between the rope receiving groove 11 and the strip-shaped wedge member 31 to increase the dimensional difference between the width L ₂ of groove width L ₁ and belt wedge member 31 of the rope receiving groove 11 is increased, the rope A in the gap G, B Cause the wire to enter.
In order to avoid damage to the strands of the ropes A and B, the gap G between the rope housing groove 11 and the belt-like wedge body 31 is set to be equal to or less than the diameter of the ropes A and B. More preferably, the gap G may be set to ½ or less of the diameter of the strands of the ropes A and B.

<5> Fastening means In this example, the fastening means for integrating the shock absorber main body 20 and the pressing plate 30 is a combination of a pair of fastening bolts 50 and nuts 51. Only the bolt 50 may be screwed and fixed.
The number of tightening bolts 50 used is not limited to two in this example, and can be selected as appropriate.
Moreover, as a fastening means between the buffer body 20 and the pushing plate 30, various known fastening means can be applied in addition to bolt fastening.

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

<1> Assembling method of shock absorber Referring to FIGS. 2 and 3, after the ropes A and B are housed in the rope housing grooves 22 and 22 of the shock absorber main body 20, A simple operation of inserting the tightening bolt 50 into the bolt body 23 and 32 of the buffer body 20 and the press plate 30 that have been put on the push plate 30 and aligned, and tightening the bolts 23 and 32, can be applied to the overlapping portions of the ropes A and B. A shock absorber 10 can be attached.
If the shock absorber main body 20 and the pushing plate 30 are brought into close contact with each other, the maximum height h of the band-like wedge body 31 is set in advance so that a predetermined slip tension can be obtained. There is no need for such troublesome torque management.

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.
The belt-like wedge body 31 of the push-in plate 30 is pushed into the rope housing groove 22 by placing the push-in plate 30 on the opening of the shock absorber main body 20 and fastening with the tightening bolts 50, so that the ropes A and B reach the outer peripheral surface. The binding force gradually increases.
Since there is no escape space for the ropes A and B in the throttle holes 40A and 40B, the ropes A and B are clamped between the inclined restraining surface 31a of the belt-like wedge body 31 and the inner peripheral surface of the rope housing groove 22 and restrained. Is maintained.
At this time, the restraining force with respect to the ropes A and B is the smallest at the rope inlet side of the throttle holes 40A and 40B, gradually increases toward the rope outlet side of the throttle holes 40A and 40B, and the rope outlet side of the throttle holes 40A and 40B. The binding force is the largest.

<2> Slip operation of shock absorber The slip operation of the shock absorber 10 will be described with reference to FIG.
When a tensile force acts on one or both of the ropes A and B, the tensile force is transmitted to the rope housing groove 22 and the inclined restraining surface 31a constituting the throttle holes 40A and 40B with which the outer peripheral surfaces of the ropes A and B are in contact.
When the tensile force exceeds the slip resistance between the ropes A and B and the peripheral surfaces of the throttle holes 40A and 40B, the ropes A and B start to slip in the pulling directions A ₁ and B ₁ .
For example, described slip of one of the rope A, the formation section of the throttle hole 40A through while rope A is gradually reduced in diameter and narrowed down to the desired diameter when passing through the minimum diameter d ₂ of the rope outlet side.
The slip operation of the rope B in the other throttle hole 40B is the same as the rope A described above.
As described above, since the entire circumferential surfaces of the ropes A and B are restrained by the inner circumferential surface of the rope housing groove 22 and the inclined restraining surface 31a, the ropes A and B pass through the throttle holes 40A and 40B. Since a substantially constant slip tension is maintained, a stable slip tension can be obtained.
In particular, the constraining surface that constrains the entire circumferential surface of each rope A, B is formed as a continuous surface toward the pulling directions A ₁ , B _{1 of the} ropes A, B. For example, the slip tension of one rope A varies. The slip tension stability is significantly improved. The same applies to the slip tension of the other rope B.
Further, the rope inlet end and the rope outlet end of the throttle holes 40A and 40B are chamfered 24 and 33, and the gap formed between the rope receiving groove 22 and the belt-like wedge body 31 is roped into the gap. Since the wires constituting A and B are formed in dimensions that do not enter, the ropes A and B are unlikely to be damaged or broken when slipping.
In addition, when there is one rope, the shock absorber 10 may be fixed by obtaining a reaction force on a stationary member or the like.

[Other Examples]
A shock absorber 10 according to another embodiment will be described with reference to FIG.

<1> A plurality of wedge-shaped wedge bodies formed in tandem In the previous embodiment, the configuration in which one belt-like wedge body 31 is formed in each throttle hole 40A, 40B has been described. A plurality of belt-like wedge bodies 31 may be formed in a tandem (in series), and the outer circumferential surfaces of the ropes A and B may be narrowed down by the plurality of belt-like wedge bodies 31.
In this example, two band-shaped wedge bodies 31, 31 are formed on one side of the pushing plate 30, and the two band-shaped wedge bodies 31, 31 are accommodated in one rope accommodating groove 22. The number of the belt-like wedge bodies 31 formed along the line 3 may be three or more.
Similar to the previous embodiment, the raised height (thickness) of each band-shaped wedge body 31 arranged in a column gradually increases from the rope inlet side to the rope outlet side of each throttle hole 40A, 40B. is there.
In this example, the throttle hole 40A, the maximum protrusion height h ₂ of the belt-shaped wedge 31 formed on the rope outlet side with respect to the maximum protrusion height h ₁ of the belt-shaped wedge 31 formed on the rope inlet side of 40B is step there will be described a case that is formed so as to increase, may be a maximum protrusion height h _1, h ₂ of a plurality of strip-shaped wedge member 31 in the same.

<2> Mounting method and slip operation of the shock absorber The mounting method and slip operation of the shock absorber 10 are the same as those in the previous embodiment.

<3> Effect of this Example When the number of the belt-like wedge bodies 31 shown in FIG. 4 is single, the ropes A and B are narrowed at one place, so that the ropes A and B are easily damaged, and the belt-like wedge bodies 31 are also damaged. It is assumed that wear damage of the raised portions of the ridges is likely to occur.
On the other hand, as shown in this example, the maximum raised heights h ₁ and h _{2 of} the plurality of belt-like wedge bodies 31 and 31 arranged in a row in the respective throttle holes 40A and 40B are formed to be increased stepwise. At the same time as the ropes A and B slip, the ropes A and B are gradually narrowed down by the belt-like wedge bodies 31 and 31 arranged in tandem, so that the ropes A and B and the belt-like wedge bodies 31 and 31 are damaged. Less.
Further, in this example, after the ropes A and B have passed through the raised portions of the band-like wedge body 31 on the right side of the drawing, the tightening of the ropes A and B is once released, and the band-like wedge body on the left side of the drawing. Since it is squeezed again by the protruding portion 31, there is an advantage that the tightening effect of the ropes A and B is increased.

[Usage example of shock absorber]
FIG. 7 shows a form in which a protection net for a protection fence is formed by combining a plurality of ropes A and B and a plurality of shock absorbers 10.
In this example, the ropes A and B are wound in a loop shape, and the shock absorber 10 is assembled at the intersection of the ropes A and B to form a plurality of single wheels a ₁ and b ₁ continuously in a horizontal row.
Further, a shock absorber 10 is assembled between the intermediate point of each single wheel a ₁ , b ₁ and the straight part of each rope A, B that are vertically adjacent to each other on the drawing, and the space between the ropes A, B located above and below is set. Connect to assemble a protective net consisting of continuous wheel elements.
Since the operation of the shock absorber 10 in this example is the same as that of the shock absorber 10 described above, description thereof is omitted.

A, B ··· Rope h, h ₁ , h ₂ ··· Maximum raised height of the belt-like wedge body 10 ··· shock absorber 20 ··· buffer body 21 ··· partition wall 22... Rope housing groove 23... Bolt hole 24... Chamfer 30 .. push plate 31. 32 ... Bolt hole 33 ... Gap 40A ... Rope A throttle hole 40B ... Rope B throttle hole 50 ... Tightening bolt 51 ... nut

The present invention is a shock absorber that restrains one or a plurality of ropes in a slidable manner and allows the ropes to slip when the rope slip resistance is exceeded, and a shock absorber body having a rope housing groove that can accommodate the ropes And a push plate capable of closing the rope housing groove of the buffer body and narrowing the rope, and fastening means for fixing the buffer body and the push plate integrally, the rope housing groove having a full length A groove- like wedge body that has a constant groove width and depth and that can be inserted into the rope-receiving groove is provided on one side of the push plate so as to protrude from the rope inlet side to the rope outlet. is formed so as to bulge height increases gradually toward the side, when the push plate the strip wedge is pushed in the rope receiving groove is in contact with the bumper body, it is formed on the side surface of the strip wedge Inclined restraint surface and the rope receiving groove Throttle hole to restrain facing against the outer peripheral surface of the rope is formed between the cross-sectional area of the throttle hole is formed so as to gradually decrease toward the inlet side of the rope to the outlet side of the rope.
In another embodiment of the present invention, a plurality of throttle holes are provided between the shock absorber main body and the pushing plate.
In another embodiment of the present invention, the belt-like wedge body has a uniform lateral width over the entire length, and the slanting restraint surface of the belt-like wedge body is inclined along the rope housing groove.
In another embodiment of the present invention, a plurality of belt-like wedge bodies are provided in a column along one side of the push plate along the rope housing groove.
In another embodiment of the present invention, the maximum raised height of the plurality of band-shaped wedges is increased stepwise from the rope inlet side to the rope outlet side of the throttle hole.
In another form of the present invention, the rope receiving groove capable of accommodating the cross-sectional shape of the entire cross-section of the rope and it has a U-shape.
In another embodiment of the present invention, irregularities are formed on at least one of the inner peripheral surface of the rope housing groove of the shock absorber main body or the inclined restraining surface of the belt-like wedge body.
In another embodiment of the present invention, a corner portion of the end portion of the rope housing groove or the inclined restraint surface is chamfered.
In another embodiment of the present invention, the difference in dimension between the groove width of the rope-receiving groove and the lateral width of the belt-like wedge body so that the rope strands do not enter the gap formed between the rope-receiving groove and the belt-like wedge body. Is less than the diameter of the rope strand.

Claims (9)

A shock absorber that restrains one or more ropes in a slidable manner and allows slipping of the rope when the slip resistance of the rope is exceeded,
A shock absorber body having a rope housing groove capable of housing a rope;
A push plate capable of closing the rope housing groove of the buffer body and narrowing down the rope;
Fastening means for fixing the shock absorber main body and the pushing plate together,
A wedge-shaped belt-like wedge body that can be inserted into the rope housing groove is provided on one side of the push plate,
The band-shaped wedge body is formed so that the ridge height gradually increases from the rope entrance side to the rope exit side,
When the pushing plate is brought into contact with the shock absorber, a throttle hole is formed between the inclined restraint surface formed on the side surface of the belt-like wedge body and the rope housing groove so as to contact and restrain the outer peripheral surface of the rope. ,
The cross-sectional area of the throttle hole is formed so as to gradually decrease from the rope inlet side toward the rope outlet side,
Shock absorber.   The shock absorber according to claim 1, wherein a plurality of throttle holes are provided between the shock absorber main body and the pushing plate.   The shock absorber according to claim 1 or 2, wherein the belt-like wedge body has a uniform lateral width over its entire length, and the slant restraint surface of the belt-like wedge body is inclined along the rope housing groove.   The shock absorber according to any one of claims 1 to 3, wherein a plurality of belt-like wedge bodies are provided in a row along one side of the push plate along the rope housing groove.   5. The shock absorber according to claim 4, wherein the maximum raised height of the plurality of band-shaped wedges is increased stepwise from a rope inlet side to a rope outlet side of the throttle hole.   The shock absorber according to claim 1, 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 unevenness is formed in at least one surface of the inner peripheral surface of the rope housing groove of the shock absorber main body or the inclined restraint surface of the belt-like wedge body, according to any one of claims 1 to 6. The shock absorber described in 1.   The shock absorber according to any one of claims 1 to 7, wherein a corner portion of the end portion of the rope accommodating groove or the inclined restraining surface is chamfered.   In order to prevent the strand of the rope from entering the gap formed between the rope housing groove and the belt-like wedge body, the difference in dimension between the width of the rope housing groove and the lateral width of the belt-like wedge body is less than the diameter of the rope strand. The shock absorber according to any one of claims 1 to 8, characterized in that:

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