JP2002021940A - Wire tensioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost of a wire tensioner capable of tensioning a wire without sagging, and prevent large deflective deformation of the wire extended between columns by diametrally reducing a wire inserting port inserted into an auxiliary column when constituting a protective fence by using the wire tensioner. SOLUTION: This wire tensioner is composed of the wire 1 and a pair of wire connecting tools 2 arranged on both ends, and the total cost of the wire tensioner is reduced. The wire connecting tools 2 are composed of an end metal fitting 3, a compression spring 4 and a case 5 for housing both of these. The end metal fitting 3 is composed of a caulking tool 9 fixed to the wire 1 and a screw 10 screwed in the caulking tool 9, and the end metal fitting 3 and the compression spring 4 can be additionally incorporated into the case 5 by removing the screw 10 from the caulking tool 9. Since a required process is only to insert the caulking tool 9 into the wire inserting port 21 of the auxiliary column 16 by removing the compression spring 4 and the case 5, the wire inserting port 21 can be diametrally reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire tensioning device for stretching a wire between two points without slack. The wire tensioning device is used, for example, when a wire is stretched between adjacent columns to form a fence together with the auxiliary columns.

[0002]

2. Description of the Related Art A wire tensioning device of this type is known, for example, from Japanese Patent Application Laid-Open No. 10-38034. Where,
One end of the wire is fixed to a column via a wire connector, and the other end of the wire is tensioned by a wire tensioner attached to the column, so that the wire is stretched between adjacent columns. The wire connector and the wire tensioner are fixed to the column by screwing each case into a male screw body mounted on the column.

[0003]

In the wire tensioning device constituted by the wire connector and the wire tensioner as described above, the length of the wire at the beginning of tension can be freely adjusted, so that the distance between adjacent columns between the pillars varies. In such a case, the wires can be stretched without hindrance. The problem is that the overall cost of the wire tensioner, especially the wire tensioner with a built-in ball chuck, is expensive. In addition, when a wire is tensioned using a wire tensioner with a built-in ball chuck, the ball cuts into the wire as the tension increases and the wire is deformed, so the wire is cut with a load lower than the breaking load of the wire itself. Resulting in.

Therefore, the present inventor replaces the wire tensioning tool with a built-in ball chuck and spreads the wire with a wire coupling tool that requires less cost, and only calculates the difference in cost between the wire tensioning tool and the wire coupling tool. , Thought to reduce the overall cost of the wire tensioning device. In this case, the end fitting is caulked and fixed to the wire end in a state where the end fitting is assembled in the case together with the compression spring, and the left and right wire connectors are carried to the construction site in a completed state. This is because crimping of end fittings and assembly of parts cannot be performed at the construction site.

[0005] When a protective fence is constructed, as the distance between adjacent columns is larger, the number of wire tensioning devices used to construct the fence can be reduced, and the construction cost of the fence can be reduced. However, when the column spacing, that is, the total length of the wire is increased, the wire is largely bent and deformed, for example, in a case where the wire is held by a person. In many cases, auxiliary columns are provided between adjacent columns to restrict the wire from bending and deforming. As described above, in a protective fence in which an auxiliary column is provided between adjacent columns, it is necessary to pass a wire through a wire opening provided in the auxiliary column. Therefore, in the case of the wire tensioning device constituted by the pair of left and right wire connectors as described above, it is necessary to pass one of the wire connectors through the wire opening, and the diameter of the wire opening becomes large. Inevitable. The problem is that the larger the wire opening is, the larger the amount of bending deformation of the wire stretched between the columns becomes, and the significance of providing the auxiliary columns becomes less.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wire tensioning device which comprises a wire and a pair of wire connectors fixed to both ends thereof, thereby reducing the overall cost as compared with a conventional wire tensioning device. Is to do. Another object of the present invention is to provide a protective fence including an auxiliary strut by using a wire tensioning device constituted by a wire and a pair of wire connectors fixed to both ends of the wire and through the auxiliary strut. An object of the present invention is to make the wire opening as small as possible so that the amount of bending deformation of the wire stretched between the columns can be made as small as possible. Another object of the present invention is to provide a wire which can be stretched with a larger tension than when a wire is stretched using a wire tensioner having a built-in ball chuck. The purpose is to improve the structural strength and durability of the fence.

[0007]

The wire tensioning device of the present invention has a wire 1 and a pair of left and right wire connectors 2 provided at both ends of the wire 1. Each of the two wire connectors 2 is connected to a connector 17 provided on the column 15 via a screw so as to be able to perform a tension operation. The wire connector 2 is
An end fitting 3 fixed to an end of the wire 1, and a compression spring 4 for urging the end fitting 3 to move outside the case 5.
And a cylindrical case 5 that houses the end fitting 3 and the compression spring 4. The end fitting 3 includes a caulking tool 9 having one end caulked and fixed to the end of the wire 1, and a screw 7 which is screwed into the other end of the caulking tool 9 so as to be loosely fastened and receives one end of the compression spring 4. Thus, the end fitting 3 and the compression spring 4 can be assembled to the case 5 later.

More specifically, the case 5 is provided with a spring hole 6 for accommodating the end fitting 3 and the compression spring 4 and a through hole 7 for allowing the end fitting 3 to be inserted. The end fitting 3 and the compression spring 4 are inserted into the spring hole 6 so that they can be assembled to the case 5 later.

An operation section 8 for screwing the case 5 is provided on the peripheral surface of the case 5. On the peripheral surface of the caulking portion of the caulking device 9, an engaging portion 12 for holding the caulking device 9 in a detent is provided. In another wire tensioning device, a thrust bearing is arranged between the compression spring 4 and the case 5.

[0010]

The wire tensioning device is composed of the wire 1 and the pair of left and right wire coupling devices 2 provided at both ends of the wire 1. Therefore, the wire tensioning device having a built-in ball chuck and the wire coupling device are constituted. Compared with the conventional wire tensioning device, the overall cost of the wire tensioning device can be reduced and the cost can be reduced. The end fitting 3 includes a caulking tool 9 caulked and fixed to the wire 1 and a screw 7 screwed into the caulking tool 9, and the end fitting 3 and the compression spring 4 are connected to the case 5.
When the wire 1 is passed through the wire passage 21 provided in the auxiliary support 16, the screw 7
By detaching the compression spring 4 and the case 5 from the caulking device 9 by removing the caulking device 9, only the caulking device 9 needs to be passed through the wire opening 21. The diameter of the wire passage 21 is made as small as possible as compared with the case where the wire is passed through the passage, so that the amount of bending deformation of the wire stretched between the columns can be suppressed.

Further, since the end fittings 3 are fixed to both ends of the wire 1, each end fitting 3 is received by the case 5, and the wire 1 is stretched between the columns, the wire tensioning tool having a built-in ball chuck is used. The wire can be stretched with a larger tension than when the wire is stretched. this is,
This is because there is no deformation of the wire 1 due to the ball due to the increase in the tension. According to the result of the actually performed comparative test, when the wire breaking strength when the wire is stretched using the wire tensioner is 1, The breaking strength of the wire tensioner of the invention is about
It has been confirmed that it can be improved to less than 1.4 times. Therefore, according to the protection fence constituted by using the wire tensioning device of the present invention, the structural strength and durability can be sufficiently improved as compared with this kind of conventional protection fence. Further, the compression springs 4 are built in each of the wire connectors 2 provided at both ends of the wire 1, and the wires 1 are stretched between the columns in a state where each compression spring 4 is fully compressed. Even if the wire is stretched and deformed due to a change or a temperature change, the wire can be absorbed by stretching the compression spring 4. Therefore, once the wire 1 is stretched, it is not necessary to retighten the wire 1,
This is also advantageous in that no maintenance is required.

The case 5 is provided with a spring hole 6 and a through hole 7, and the end fitting 3 and the compression spring 4 are inserted into the case 5 by inserting the caulking tool 9 from the through hole 7 to the side of the spring hole 6. According to the wire connector 2 to be assembled later, for example, a groove for hooking a wire is formed on the peripheral wall of the case 5, and the end fitting 3 and the compression spring 4 are assembled later to the case 5. In addition, the structural strength of the case 5 can be improved, and the size of the case 5 can be reduced accordingly.

When the case 5 of the wire connector 2 is screwed into the connector 17 of the column 15, if the frictional resistance between the end fitting 3 and the compression spring 4 exceeds a certain value as the tension of the wire 1 increases. , The wire 1 rotates together with the case 5 and untwistes or unnecessary twist is added.
May decrease in strength. In order to prevent such a rotation of the wire 1 along with the wire, an engaging portion 12 is provided on the peripheral surface of the caulking portion of the caulking device 9 so that the case 5 can be screwed in a state where the engaging portion 12 is non-rotatably held. I have to.

According to the wire tensioning device in which the thrust bearing is disposed between the compression spring 4 and the case 5, the rotation of the thrust bearing can prevent the wire 1 from rotating together with the case 5, so that The engaging portion 12 can be omitted.

[0015]

1 to 5 show an embodiment in which a protective fence is constituted by a wire tensioning device according to the present invention. In FIG. 5, the wire tensioning device comprises a wire 1 made of stainless steel and a pair of wire connectors 2 provided at both ends thereof.

In FIG. 2, a wire connector 2 is a wire 1
End fitting 3 caulked to the end of
And a bottomed cylindrical case 5 for accommodating them. The case 5 is formed of a stainless steel material, and has a spring hole 6 for accommodating the end fitting 3 and the compression spring 4 therein, and a through hole 7 for inserting the end fitting 3.
And a screw portion 5a is formed on the inner surface of the cylindrical wall on the opening end side. An operation portion 8 for engaging a screwdriver such as a spanner is formed on the opposite peripheral surface of the case 5 near the opening 7.

The end fitting 3 and the compression spring 4 are connected to a case 5
In order to enable post-assembly, the end fitting 3 is screwed into a crimping tool 9 made of a stainless steel material, one end of which is crimped to the end of the wire 1, and the other end of the crimping tool 9 so as to be loosely fastened. And a screw 10 for receiving one end of the compression spring 4. In FIG. 3, the swaging tool 9 is formed of a cylindrical shaft having a circular cross section, and has a screw hole 11 for a screw 10 formed at one end inner surface. The wire 1 and the crimping tool 9 are integrated by inserting the end of the wire 1 into the inner surface on the other end side of the crimping tool 9 and crimping the entire peripheral surface. At this time, by forming the peripheral surface shape after the caulking process into a hexagonal shape, the caulked portion can be used as the engaging portion 12 for a screwdriver tool. As shown in FIG. 3B, the outer line of the engaging portion 12 is located inside the outer peripheral surface of the cylindrical shaft portion where the screw hole 11 is formed.

The dimensional relationship between the compression spring 4, the through-hole 7 of the case 5, the caulking tool 9 and the screw 10 is set as follows. With the diameter of the circular peripheral surface of the caulking tool 9 as a reference value, the diameter of the opening 7 is set slightly larger than the reference value, and the caulking tool 9 can be inserted into the spring hole 6 from the side of the opening 7. To do. The diameter of the coil center diameter of the compression spring 4 is set to be larger than the diameter of the opening 7 so that the compression spring 4 is
So that it can be received inside Similarly, screw 1
The diameter of the operation head 13 of 0 is set larger than the diameter of the center diameter of the coil so that the operation head 13 can receive the compression spring 4.

In FIG. 5, the protective fence is connected to the adjacent support 15
15 and an auxiliary column 16 arranged between both columns 15,
It consists of a wire tensioning device that is stretched between the columns 15 in a multi-stage manner. Each pillar 15 is provided with a connecting tool 17 for screwing and connecting the wire connecting tool 2 in accordance with the number of extending stages of the wire 1.

In FIG. 4, the connecting member 17 has a screw 1 on its peripheral surface.
8 is formed of a bottomed cylindrical metal fitting, and is fastened and fixed to the supporting post 15 with bolts 19 and nuts 20 together with a connecting tool 17 arranged on the opposite wall surface of the supporting post 15. Auxiliary support 1
6, wire openings 21 corresponding to the number of stages of stretching the wire 1 are provided. The diameter of the wire passage 21 is set slightly larger than the diameter of the circular peripheral surface of the caulking tool 9.

The wire tensioning device is stretched in the following procedure.
First, as shown in FIG. 1, the case 5 of one of the wire connectors 2 is temporarily screwed into the connector 17 by several threads. The other wire connecting tool 2 has the compression spring 4 and the case 5 separated by removing the screw 10 from the caulking tool 9. The caulking tool 9 in this state is passed through the wire passage 21 of the auxiliary support 16. After this, the caulking tool 9 is
The screw 10 is screwed into the crimping tool 9 while the compression spring 4 is fitted to the caulking tool 9 from the through hole 7 of the compression spring 4. Finally, the case 5 is screwed into the screw 18 of the connecting member 17 and sufficiently tightened to tension the wire 1 as shown in FIG. The case 5 temporarily assembled earlier is similarly tightened. At this time, as the tension of the wire 1 increases, the end fitting 3 tends to rotate. However, by engaging a wrench or a wrench with the engaging portion 12, only the case 5 can be tightened. . Finally, the case 5 is screwed until the compression spring 4 is fully compressed, so that there is no room for the wire 1 to slack.

When a commercially available screw is used, the diameter of the operation head 13 of the screw 10 is insufficient, and the operation head 13
In some cases, the compression spring 4 cannot be received. In this case, as shown in FIG.
0 is fixed to the end of the caulking tool 9 and the washer 23 is
Can be caught.

In addition to the above embodiment, the screw portion 5a formed on the case 5 can be formed as a male screw on the outer surface of the case.
In this case, a screw is formed on the inner surface of the cylindrical wall of the connecting tool 17. The screw 10 may be any screw provided with the operation head 13 and may have any shape and structure. If necessary, a thrust bearing is arranged between the compression spring 4 and the case 5 to prevent the end fitting 3 from rotating together with the case 5 when the case 5 is tightened. Engaging part 1
No. 2 can be separately formed by cutting or the like irrespective of the peripheral surface shape of the swaged portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of a wire connector.

FIG. 2 is a longitudinal sectional front view of a wire connector.

FIG. 3 is a longitudinal sectional front view showing a caulking structure of an end fitting,
It is a bottom view.

FIG. 4 is a longitudinal sectional front view showing a connection structure between a wire connection tool and a support.

FIG. 5 is a front view of a protection fence.

FIG. 6 is a sectional view showing another embodiment of the end fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire 2 Wire connection tool 3 End fitting 4 Compression spring 5 Case 6 Spring hole 7 Through hole 9 Caulking tool 10 Screw

Claims (4)

[Claims] 1. A wire 1 and a pair of left and right wire connectors 2 provided at both ends of the wire 1. Each of the two wire connectors 2 is screwed with respect to a connector 17 provided on a column 15. A wire tensioning device connected so as to be able to perform a tensioning operation via an end fitting, wherein the wire connecting tool 2 moves the end fitting 3 fixed to the end of the wire 1 toward the outside of the case 5. Compression spring 4, end fitting 3, and compression spring 4
The end fitting 3 includes a crimping tool 9 having one end caulked and fixed to the end of the wire 1, and the other end of the caulking tool 9, which is screwed loosely and freely to be compressed. A wire tensioning device, comprising: a screw (10) for receiving one end of a spring (4); wherein the end fitting (3) and the compression spring (4) can be assembled to the case (5). 2. A case (5) is provided with a spring hole (6) for accommodating the end fitting (3) and the compression spring (4), and a through-hole (7) for allowing the end fitting (3) to be inserted. The end fitting 3 and the compression spring 4 are inserted through the hole 6.
2. The wire tensioning device according to claim 1, wherein the wire tensioning device can be retrofitted to the case 5. 3. An operation portion 8 for screwing the case 5 is provided on the peripheral surface of the case 5, and is provided on the peripheral surface of the caulking portion of the caulking device 9 for holding the caulking device 9 in a detent manner. The wire tensioning device according to claim 1, wherein the engaging portion is provided. 4. The wire tensioning device according to claim 1, wherein a thrust bearing is disposed between the compression spring 4 and the case 5.