JP2017186784A - Grip device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grip device, which enables a device structure to be easily manufactured at low cost and enables slip resistance to be easily adjusted.SOLUTION: A grip device comprises: multiple constrained single plates 20a, 20b, which can sandwich outer peripheral surfaces of ropes A, B from both sides; and a fixing means to position and fix the multiple constrained single plates 20a, 20b. The constrained single plates 20a, 20b have a catching opening 22 and a rope storage groove 23 on a single plate body 21. The multiple constrained single plates 20a, 20b adjoin so that the catching opening 23 alternately turns 180 degrees to face the opposite direction. A center Oof the rope storage groove 23 is eccentrically positioned toward an entrance side of the catching opening 22 relative to a center Oof the fixing means.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a grip device that restrains one or a plurality of ropes in a slippable manner.

The rockfall or avalanche protective fence includes a shock absorber having a function of absorbing external force applied to the protective net.
In Patent Documents 1 and 2, a shock absorber provided with two clamping plates formed of steel or cast iron capable of gripping the overlapping portion of a rope forming a loop, and a plurality of fastening bolts and nuts for clamping the clamping plate Is disclosed.
In the conventional shock absorber, one or a plurality of rope receiving grooves continuous on the opposing surface of each clamping plate are recessed, and each rope receiving groove has a semicircular cross section, and the diameter and depth of the entire length of the rope receiving groove are the same. It is uniform.
The sliding resistance between the rope housing groove and the outer peripheral surface of the rope is determined by the tightening force of the fastening bolt that tightens the clamping plate, and if a tensile force greater than the sliding resistance set between the rope and the clamping plate is applied. The rope slips.

JP 2008-267095 A JP 2010-144433 A

The conventional shock absorber has the following problems.
<1> It is difficult to tighten a plurality of fastening bolts uniformly with a predetermined torque, and the fastening force tends to vary.
If the fastening force varies, the shock absorber cannot exhibit normal shock absorbing performance.
<2> For example, just because the rope pulling force has doubled, even if the device size and bolt fastening force are doubled, the sliding resistance of the rope does not double.
Conventional shock absorbers must be individually designed by combining various design elements such as the device size and bolt fastening force according to the magnitude of the tensile force, and the shock absorber design corresponding to the magnitude of the tensile force It took a long time.
<3> Since the corner of the groove end of the rope housing groove is sharply pointed, there is a risk that the rope may be damaged or broken by hitting the sharp corner of the rope housing groove when the rope slides.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a grip device in which the structure of the device is simple and can be manufactured at low cost, and the slip resistance can be easily adjusted. .

The present invention is a grip device that restrains one or more ropes in a slippable manner and allows the ropes to slip when exceeding the slip resistance of the ropes. A plurality of constraining single plates that can be sandwiched from and a fixing means for positioning and fixing the plurality of constraining single plates, and the constraining single plate has a pinching opening at the center of the single plate main body, A rope housing groove is provided at the back of the sandwiching port, and the plurality of constraining single plates are stacked in a state where the direction of the sandwiching port is reversed by 180 °, and the center of the rope housing groove of the constraining single plate However, it is in a positional relationship eccentric to the entrance side of the insertion port with respect to the center of the fixing means.
In another embodiment of the present invention, when the plurality of constraining single plates are pushed so that the eccentricity of the adjacent plural constraining single plates is zero, the push-in direction is reversed via the rope housing groove. The rope is deformed into a corrugated shape.
In another embodiment of the present invention, both ends of the rope housing groove are chamfered.
In another embodiment of the present invention, the housing grooves of the plurality of restraining single plates sandwiching the outer peripheral surface of the rope from both sides are formed discontinuously along the longitudinal direction of the rope.
In another embodiment of the present invention, the fixing means is a combination of a through hole provided at both ends of the single plate main body and a positioning body having a length that can be inserted across the plurality of through holes.

The invention according to the present invention has the following effects.
<1> Since the same structure of restraint veneers can be used in common, the grip device can be manufactured at low cost, and the number of restraint veneers can be selected or the amount of eccentricity of each restraint veneer can be changed. The slip resistance (slip tension) of the grip device can be set easily.
<2> With a simple operation of pushing a plurality of restraining single plates very slightly, the outer peripheral surface of the rope bent into a wave shape can be restrained with an equal force, and a stable slip resistance can be obtained. .
<3> Compared with a conventional shock absorber, not only a large number of tightening bolts and torque management of the bolts become unnecessary, but also the grip device can be miniaturized.
<4> When the rope slips due to the chamfering of both ends of the rope accommodating groove, the rope is hardly damaged or broken.
<5> A protective net having a high buffering performance can be manufactured by combining a plurality of ropes and a plurality of grip devices.

Overall perspective view of grip apparatus according to the present invention, with a portion of the rope omitted Side view of restraint veneer Explanatory drawing when the rope is sandwiched between multiple restraint veneers Explanatory drawing when the rope is restrained between multiple restraint veneers It is sectional drawing of the some restraint single board in the initial state which pinched | interposed the rope, (a) is a longitudinal cross-sectional view of several rope accommodation grooves, (b) is a longitudinal cross-sectional view of several through-holes It is sectional drawing of several restraint single board at the time of pushing in, (a) is a longitudinal cross-sectional view of several rope accommodation groove, (b) is a longitudinal cross-sectional view of several through-holes Explanatory drawing that formed a protective net for a protective fence by assembling multiple ropes and grip devices

  A preferred embodiment for carrying out the present invention will be described with reference to the drawings.

<1> Outline of Grip Device Referring to FIG. 1, the grip device 10 according to the present invention is a device that applies a certain slip resistance to one or a plurality of ropes A and B and restrains them.
“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.
The ropes A and B include a steel rope, a resin rope, a fiber rope, or a composite thereof.
In this example, the grip device 10 will be described as a form of constraining two ropes A and B having different pulling directions A ₁ and B _1. However, the present invention is applicable even when the number of ropes is one or three or more. Is possible.

<2> Grip Device The grip device 10 includes a plurality of restraining single plates 20 that can be sandwiched from both sides of the ropes A and B across the ropes A and B, and a fixing means that integrally fixes the plurality of restrained single plates 20 stacked. It consists of. The plurality of constraining single plates 20 have the same structure, and are made of a hard material such as steel or cast iron.

<3> Restraint veneer Referring to FIG. 2, the restraint veneer 20 includes a veneer body 21 having a uniform thickness, which is generally U-shaped.
The constraining veneer 20 of this example has a sandwiching port 22 established in the center of the veneer main body 21, and a single or a plurality of rope housing grooves formed in the inner part of the sandwiching port 22 in the crossing direction of the single plate main body 21. 23 and a pair of through-holes 24, 24 having a circular shape provided at both ends of the single plate main body 21.
The diameter of the rope accommodating groove 23 having an arc shape is substantially equal to the diameter of the accommodating rope, and both ends of the rope accommodating groove 23 are chamfered 26 so that the ropes A and B are not damaged when slipping.
The outer shape (contour shape) of the constraining single plate 20 is not limited to the illustrated elliptical shape, and may be a rectangle or a circle.
Since the restraint single plate 20 having the same structure is used in common, the grip device 10 can be manufactured at low cost.

<3.1> Number of Constrained Single Plates The constrained single plate 20 is used by overlapping a plurality of single plate main bodies 21.
In this example, the side surfaces 25 of the plurality of single plate main bodies 21 are illustrated as being adjacent to each other, but the adjacent single plate main bodies 21 may be separated without contacting the side surfaces 25.
In this example, a configuration in which a total of three constraining veneers 20 are used in parallel is shown, but the number of constraining veneers 20 may be four, or in short, the number of constraining veneers 20 may be two or more. .

<3.2> Rope Housing Groove In this example, the ropes A and B are both the same diameter, and the pair of rope housing grooves 23 and 23 have the same diameter as the ropes A and B. The ropes A and B may be a combination of different diameters.
In short, the rope housing grooves 23 and 23 corresponding to the ropes A and B may have substantially the same diameter as the ropes A and B.
In addition, the cross-sectional shape of the receiving grooves 23 and 23 is not limited to a circle, and may be an ellipse, a polygon such as a quadrangle, or a hexagon.

<3.3> Assembly Direction of Restraint Single Plate The plurality of restraint single plates 20 are assembled to the ropes A and B with the direction of the sandwiching opening 22 reversed 180 ° for each solid of the restraint single plate 20.
The reason for assembling the plurality of constraining single plates 20 in the reverse direction is to restrain the ropes A and B by bending them into a corrugated shape.
In this example, a configuration is shown in which the constraining single plate 20 is assembled by alternately changing upward and downward.
When assembling to the ropes A and B, the plurality of constraining single plates 20 do not face each other directly, and it is only necessary that the orientations of the sandwiching ports 22 of the plurality of constraining single plates 20 adjacent to each other are reversed.
In this example, the configuration is shown in which the constraining single plate 20 is replaced for each sheet, but may be replaced for a plurality of sheets.
Therefore, when the grip apparatus 10 is assembled to the ropes A and B, the rope receiving grooves 23 of the plurality of restraining single plates 20 are not continuous along the longitudinal direction of the ropes A and B but are formed discontinuously.

<4> Fixing means In this example, the fixing means for fixing the plurality of constraining single plates 20 together has a position where the through holes 24 of the constraining single plate 20 and a length that can be inserted across the plurality of through holes 24 are inserted. The case where it is the combination of the restraint bolt 30 which is a decided body is demonstrated.
In addition, it is also possible to apply a pin with a stopper in place of the restraining bolt 30 of the positioning body.

As another fixing means, it is also possible to apply a spring clip obtained by bending a band-shaped or bar-shaped spring steel into a U-shaped shape or the like that can be sheathed at the end of the constraining single plate 20.
The outer peripheral surfaces of the ropes A and B are restrained with an equal force by applying a spring force in the reverse direction to each of the restraining single plates 20 adjacent to each other by the plurality of spring clips externally mounted on the ends of the restraining single plate 20. be able to.

<5> Positional relationship between the center of the rope housing groove and the center of the fixing means Referring to FIGS. 2 to 4, the center O ₁ of the rope housing groove 23 and the center O of the fixing means (the through hole 24 or the restraining bolt 30 in this example). The positional relationship of ₂ will be described.
The center O ₁ of the rope housing groove 23 is eccentric by a predetermined distance (eccentric amount) e toward the entrance side of the sandwiching port 22 with respect to the center O _{2 of the} fixing means.
In other words, the center O _{2 of the} fixing means is eccentric by a predetermined distance e on the groove bottom side of the rope housing groove 23 with respect to the center O ₁ of the rope housing groove 23.
In this example, the center line L ₁ passing through the center O ₁ of the pair of rope housing grooves 23, 23 is sandwiched with respect to the center line L ₂ passing through the center O ₂ of the pair of through holes 24 or the pair of restraining bolts 30. A predetermined distance e is biased toward the entrance side of the mouth 22.
The reason why the center O ₁ of the rope housing groove 23 and the center O _{2 of the} fixing means are eccentric (biased) is to apply the restraining force of the ropes A and B to the plurality of restraining single plates 20.
When the amount of eccentricity of the constraining single plate 20 is the distance e, a double amount of eccentricity (2e) is generated between adjacent constraining single plates 20.
Therefore, the restraining force of the ropes A and B is obtained from the distance e of the restraining single plate 20.

[Grip device assembly method]
A method for assembling the grip apparatus 10 will be described with reference to FIGS.
In this example, for easy understanding, the case where the restraint veneer 20a with the insertion port 22 facing upward and the restraint veneer 20b with the insertion port 22 facing downward are assembled to the ropes A and B arranged horizontally. explain.

<1> Clamping in Rope As shown in FIG. 3, a plurality of restraining single plates 20a and 20b are arranged with the clamping ports 22 facing each other on both upper and lower sides of the ropes A and B.
The ropes A and B are accommodated in the rope accommodating grooves 23 and 23 by sandwiching the restraining single plates 20a and 20b from the upper and lower sides of the ropes A and B, respectively.

FIG. 5 shows a cross section of the plurality of constraining single plates 20a and 20b in an initial state with the ropes A and B sandwiched therebetween, (a) showing a cross section of the plurality of rope receiving grooves 23, and (b) showing a plurality of penetrations. A cross section of the hole 24 is shown.
In the initial state where the ropes A and B are simply sandwiched between the plurality of restraining single plates 20a and 20b, as shown in FIG. 5 (a), the centers of the plurality of upper and lower rope receiving grooves 23 arranged in the longitudinal direction of the rope. Are located on substantially the same line, and the ropes A and B are in a straight state.
In this initial state, as shown in FIG. 5B, the centers of the plurality of through holes 24 located along the longitudinal direction of the rope are slightly shifted in the vertical direction.

<2> Pushing of Restraint Single Plate Next, as shown in FIG. 4, a plurality of restraint single plates facing each other until the amount of eccentricity becomes zero using a restraint device (not shown) such as a hydraulic jack or a vise. Push 20a, 20b by applying an external force.
That is, as shown in FIG. 4, the centers of the through holes 24 formed on the left and right sides of the adjacent constraining single plates 20a and 20b by pushing the constraining single plates 20a and 20b with the insertion port 22 facing upward and downward. Match O ₂ . In this state, the amount of eccentricity becomes zero.

FIG. 6 shows a cross section of the plurality of restraining single plates 20a and 20b at the time of pushing, and FIG. It shows a longitudinal sectional view of a plurality of through holes 24 in a state in which the center O ₂ were matched for the respective through holes 24 (FIG. 4) formed.
6A shows a displacement state of the plurality of rope housing grooves 23 and 23 in a state where the centers O ₂ of the plurality of through holes 24 are matched (FIG. 4).
When the restraining single plates 20a and 20b are pushed into each other, the plurality of rope receiving grooves 23 and 23 alternately press the outer peripheral surfaces of the ropes A and B upward and downward to bend the ropes A and B into a corrugated shape.
For example, when the diameters of the ropes A and B are 12 mm and the distance e shown in FIG. 2 is set to 0.5 mm, the ropes A and B are discontinuous rope receiving grooves 23 of the restraining single plates 20a and 20b. , 23 is pushed by 1.0 mm from both the upper and lower sides with a gap between the outer peripheral surfaces.
Since the moving distance (2e) of the restraining single plates 20a and 20b is as small as about 1 mm, the ropes A and B can be easily bent and restrained using a small restraining device.

<3> Positioning and Fixing of Restraint Single Plates As shown in FIG. 6B, when the plurality of restraint single plates 20a and 20b are pushed in, the through holes 24 and 24 on the left and right sides of the respective restraint single plates 20a and 20b are provided. The restraint bolts 30 and 30 are inserted in the state aligned on the same line, and the nuts 31 are screwed to fix the plurality of restraint single plates 20a and 20b.
The restraint bolts 30 installed across the plurality of restraint single plates 20a and 20b restrict the return of the restraint single plates 20a and 20b, and the restraint state of the ropes A and B is maintained.

  As a method of assembling the restraint bolt 30, after the restraint bolt 30 is inserted in advance through the left and right through holes 24 of the restraint single plates 20a and 20b, the restraint single plates 20a and 20b are centered on the restraint bolt 30. And the restraint bolt 30 may be inserted into the other through-hole 24, or the restraint bolts may be simultaneously applied to the left and right through-holes 24 and 24 in a state where the opposing restraint single plates 20a and 20b are pressed in parallel. 30 may be inserted.

<4> Slip operation of the grip device When a tensile force acts on one or both of the ropes A and B restrained by the grip device 10, the tensile force is transmitted to the contact surfaces of the ropes A and B and the rope housing groove 23.
When the tensile force does not exceed the slip resistance between the peripheral surfaces of the ropes A and B and the rope housing grooves 23 and 23, the ropes A and B do not slip.
When the tensile force exceeds the slip resistance between the ropes A and B and the circumferential surfaces of the rope housing grooves 23 and 23, the ropes A and B start to slip in the pulling directions A ₁ and B ₁ and are pulled by this sliding resistance. The force is attenuated.
Each of the ropes A and B slips between a plurality of adjacent constraining single plates 20a and 20b while maintaining the waveform shape, so that a stable slip resistance can be obtained.

<5> Setting Method of Slip Resistance Since the grip device 10 has a constant slip resistance between the restraining single plate 20 and the ropes A and B per sheet, the grip device 10 can select the number of laminated single plates 20 (setting method). 1) Alternatively, the slip resistance (slip tension) of the entire grip device 10 can be easily set by changing the amount of eccentricity of the constraining single plate 20 (setting method 2).
The slip resistance of the grip device 10 is set by combining one or both of the setting methods 1 and 2 described above in consideration of the required slip resistance force and installation space.

<6> Assembly Example of Grip Device FIG. 7 shows a form in which a plurality of ropes A and B and a plurality of grip devices 10 are combined to form a protective net for a protective fence.
In this example, the ropes A and B are wound in a loop shape, and the grip device 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, the grip device 10 is assembled between the intermediate point of each single wheel a ₁ , b ₁ adjacent to the upper and lower sides in the drawing and the straight part of each rope A, B, so that the rope A, B positioned above and below Connect to assemble a protective net consisting of continuous wheel elements.
Since the operation of the grip device 10 in this example is the same as that of the grip device 10 described above, the description thereof is omitted.

A, B ··· rope 10 ··· grip device 20 · · · restraint veneer 20a · · · restraint veneer 20b with the insertion port facing upward · · · Restrained veneer 21... Single plate body 22... Clamping opening 23... Rope receiving groove 24... Through hole 30. ····nut

Claims (5)

A grip device that restrains one or more ropes in a slippable manner and allows the rope to slip when the rope slip resistance is exceeded,
A plurality of constraining veneers arranged in an overlapping manner and capable of sandwiching the outer peripheral surface of the rope from both sides;
A fixing means for positioning and fixing the plurality of restraining veneers,
The restraint veneer has a pinch opening at the center of the veneer body, and has a rope receiving groove at the back of the pinch opening,
The plurality of restraining veneers are stacked in a state where the direction of the sandwiching opening is reversed by 180 °,
The center of the rope housing groove of the restraint single plate is in a positional relationship eccentric to the entrance side of the sandwiching port with respect to the center of the fixing means,
Grip device.   When the plurality of constraining single plates are pushed in such that the eccentricity of the plurality of constraining single plates is zero, the rope is deformed into a corrugated shape via a rope receiving groove whose pushing direction is opposite. The grip device according to claim 1, wherein the grip device is characterized.   The grip device according to claim 1 or 2, wherein both ends of the rope housing groove are chamfered.   4. The receiving groove of the plurality of restraining single plates sandwiched from both sides of the outer peripheral surface of the rope is formed discontinuously along the longitudinal direction of the rope. The grip device according to one item.   The said fixing | fixed means is a combination of the through-hole provided in the both ends of the single-plate main body, and the positioning body which has the length which can be penetrated ranging over several through-holes, It is characterized by the above-mentioned. Grip device.

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