KR20180085452A - Apparatus for triggering cable bending - Google Patents

Abstract

Disclosed is an apparatus for triggering bending of a cable that is installed to an optical cable fence for detecting trespassing when a trespasser trespasses over an upper end of the fence. The apparatus includes: a housing forming a cable passage extending in a first direction; a cover for housing the housing; a fixing piece engaged to the cover and penetrating the housing in a second direction, wherein the fixing piece being formed with a slit; and a cable disposed in the first direction through the cable passage and penetrating the slit. The cover and the fixing piece are positioned at a first position, and if an external force is applied thereto, the cover and the fixing piece can be moved to the second direction on the basis of the housing and then be positioned at a second position. At least a portion of the slit is positioned in the cable passage when the cover and the fixing piece are positioned at the first position, but is positioned outside the cable passage when the cover and the fixing piece are positioned at the second position.

Description

[0001] APPARATUS FOR TRIGGERING CABLE BENDING [0002]

The present invention relates to a cable bending inducing device, and more particularly, to a cable bending inducing device installed in an optical fiber fence for intrusion detection and used for detecting an intrusion.

The optical cable is characterized in that the optical signal transmitted through the optical cable changes when it is cut or bent (folded). Optical time-domain reflectometer (OTDR) technology also allows relatively accurate detection of the location of the cut or bent portion of the optical cable. Using these features, optical cables are often used for security purposes.

Specifically, the technique of using an optical cable woven in the form of a net in the form of a security fence, a fence, or a wall to detect an intrusion is already well known. U.S. Patent No. 5,592,149 (registered on January 7, 1997) and Korean Patent Laid-Open No. 10-2006-0108319 (published on November 9, 2007) disclose such an optical cable device for intrusion detection.

In the apparatus according to the prior art, the optical cable is woven in the form of a dense network. This structure is intended to detect when an intruder cuts or severely bends an optical cable to create an intrusion hole. However, an intruder may attempt to place a ladder on a fiber optic cable fence, a blanket on a fence, and then over the top of the fence. Such an attempt does not cut the optical cable in the form of a mesh, and the force applied to the optical cable by the ladder or the blankets may be dispersed, so that sufficient bending may not be formed. Therefore, the conventional structure has a problem that the probability of not detecting such an intrusion is considerable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cable bending induction device capable of detecting intruders entering an upper end of an intrusion detection optical cable fence.

Another problem to be solved by the present invention is to provide a cable bending inducing device having a simple structure and an easy installation of a worker.

Another problem to be solved by the present invention is to provide a cable bending inducing device in which a portion causing bending of a cable is not exposed to the outside and an intruder can not approach the bending inducing portion.

According to an aspect of the present invention, there is provided a cable bending induction apparatus comprising: a housing defining a cable passage extending in a first direction; a cover accommodating the housing therein; And a cable penetrating in a second direction and provided with a slit and a cable disposed along the first direction through the cable passage and passing through the slit, wherein the cover and the fixing piece are located at a first position The slit may be moved in the second direction with respect to the housing when the external force is applied, and may be located at the second position, and at least a part of the slit may be positioned at the first position when the cover and the fixing member are at the first position, And when the cover and the fixing member are positioned at the second position, they are positioned outside the cable passage.

In one embodiment of the present invention, the cable passing through the slit is located inside the cable passage when the cover and the fixing member are located at the first position, and the cover and the fixing member are located within the second It can be located outside the cable passage.

In one embodiment of the present invention, when the cover and the fixing member are positioned at the second position, the cable can be bent at a portion passing through the slit.

In one embodiment of the present invention, the housing includes an opening through which the fixing piece passes, and when the cover and the fixing piece are positioned at the second position, the cable passing through the slit penetrates through the opening And may be located outside the cable passage.

In one embodiment of the present invention, when the cover and the fixing member are placed in the second position, the cable can be bent at a portion passing through the opening.

In one embodiment of the present invention, the opening is formed to be larger than a fixing piece of a portion passing through the opening, and a spacing space may be formed between the inner peripheral surface of the opening and the fixing piece.

In one embodiment of the present invention, when the cover and the fixing member are positioned at the second position, a cable passing through the slit may extend outward through the spacing space.

In one embodiment of the present invention, the slit may be in the form of one end extended to the end of the fixing piece and opened.

In one embodiment of the present invention, the slit may include a separation preventing portion formed to be narrower than other portions of the cable so that the cable is not separated through the open end.

In one embodiment of the present invention, the separation preventing portion may be formed at one end of the slit.

In one embodiment of the present invention, the separation preventing portion may include a protrusion protruding from the inside of the slit.

In an embodiment of the present invention, the other end of the slit may be located inside the stationary piece and closed.

In one embodiment of the present invention, the other end of the slit is positioned inside the cable passage when the cover and the fixing member are located at the first position, and the cover and the fixing member are located at the second position It may be located outside the cable passage.

In one embodiment of the present invention, the slit may include a first slit portion extending in the second direction.

In an embodiment of the present invention, the slit may include a second slit portion spaced apart from the first slit portion and extending in the second direction, and a connection slit portion connecting the first slit portion and the second slit portion, And the like.

In one embodiment of the present invention, one end of the first slit extends to the end of the fixing member and the other end extends to the connection slit, and one end of the second slit extends from the connection slit And the other end portion of the second slit portion may be in the form of being closed and positioned inside the fixing piece.

In one embodiment of the present invention, the first direction and the second direction may be orthogonal to each other.

In one embodiment of the present invention, the cover and the fixing piece are orthogonal to the first direction, and movement in a third direction different from the second direction may be restricted.

In one embodiment of the present invention, the apparatus further includes a guide member fixedly coupled to the cover and extending in the second direction inside the cover, wherein the housing includes a guide hole through which the guide member passes .

In an embodiment of the present invention, the cover may include a first cover portion and a second cover portion which are coupled to each other to form an inner space.

According to an embodiment of the present invention, the elastic body may be disposed between the housing and the cover to restore the housing to the first position.

In one embodiment of the present invention, the cable includes a first cable and a second cable spaced apart in the second direction, and the first cable and the second cable are separated from each other by a first slit and a second cable, 2 slits, respectively.

In one embodiment of the present invention, the cover and the fixing piece may move in a third direction opposite to the second direction with respect to the housing when an external force is applied, and may be located at a third position, When the fixing member is positioned at the third position, it is positioned outside the cable passage. When the cover and the fixing member are positioned at the second position, more bending is caused on the first cable than the second cable And when the cover and the fixing member are positioned at the third position, further bending can be induced in the second cable than the first cable.

In an embodiment of the present invention, the cable bending inducing device may be installed in a bent shape at an upper end of a fence structure installed in a direction perpendicular to the paper surface, and the second direction may be a direction parallel to the paper surface.

The cable bending inducing device according to an embodiment of the present invention can detect that an intruder intrudes over an upper end of an intrusion detection optical cable fence.

In addition, the cable bending inducing device according to an embodiment of the present invention is advantageous in that it is simple in structure and easy to install by a worker.

In addition, the cable bending inducing device according to an embodiment of the present invention is advantageous in that a portion of the cable bending inducing structure is not exposed to the outside, so that the intruder can not approach the bending inducing portion.

1 is a perspective view of an optical cable fence structure for intrusion detection in which a cable bending inducing device according to an embodiment of the present invention is installed.
2 is a perspective view of a cable bending induction device according to an embodiment of the present invention.
3 is an exploded perspective view of a cable bending induction device according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of the cable bending inducing device shown in FIG. 2 cut along line AA '.
Fig. 5 is an enlarged cross-sectional view of a portion of the cable bending inducing device shown in Fig. 4. Fig.
FIG. 6 is a cross-sectional view of the cable bending inducing device shown in FIG. 2, taken along line BB '.
FIG. 7 is a cross-sectional view illustrating a state in which the cover and the fixing member of the cable bending inducing device shown in FIG. 4 are moved to the second position.
Fig. 8 is an enlarged cross-sectional view of a portion of the cable bending inducing device shown in Fig. 7;
FIG. 9 is a cross-sectional view illustrating a state in which the cover and the fixing member of the cable bending inducing device shown in FIG. 6 are moved to the second position.
FIG. 10 is a cross-sectional view of the cable bending inducing device shown in FIG. 4 when the cover and the fixing member are moved to the third position.
Fig. 11 is an enlarged cross-sectional view of a portion of the cable bending inducing device shown in Fig. 10; Fig.
FIG. 12 is a cross-sectional view illustrating a state in which the cover and the fixing member of the cable bending inducing device shown in FIG. 6 are moved to the third position.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is judged that it is possible to make the gist of the present invention obscure by adding a detailed description of a technique or configuration already known in the field, it is omitted from the detailed description. In addition, terms used in the present specification are terms used to appropriately express the embodiments of the present invention, which may vary depending on the person or custom in the relevant field. Therefore, the definitions of these terms should be based on the contents throughout this specification.

Hereinafter, a cable bending inducing device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5 attached hereto.

1 is a perspective view of an optical cable fence structure for intrusion detection in which a cable bending inducing device according to an embodiment of the present invention is installed. Referring to FIG. 1, the intrusion-detecting optical cable fence structure 90 is installed such that the optical cable 91 woven in the form of a mesh is substantially perpendicular to the ground. The optical cable 91 in the form of a net is coupled to the column 94 provided at an appropriate interval.

The intruder must cut or severely bend the optical cable 91 in order to make a hole for passing through the optical fiber cable 91 in the form of a net. An optical signal flows through the optical cable 91. When the optical cable 91 is cut or severely bent as described above, the optical signal is changed. Specifically, when the optical cable 91 is cut, the optical signal is cut off, and strong back scattering occurs at the disconnected position. When the optical cable 91 is bent, the intensity of the optical signal traveling forward is weakened according to the degree of bending, and back scattering occurs depending on the degree of bending at the bent position.

An OTDR device is connected to one end or both ends of the optical cable 91 to measure a signal flowing into the optical cable 91 and a signal obtained by backscattering the optical signal from the optical cable 91. The arrival time of the signal introduced into the optical cable 91 and the signal transmitted after the backward scattering can be calculated to detect the position where the optical cable 91 is cut or bent relatively accurately. In addition, by analyzing the pattern of the optical signal, it is possible to know whether the optical cable 91 is cut or bent, and more specifically, to what extent it is bent if it is bent. In this way, intruders can be detected.

However, the intruder can attempt to break through the top of the fence of the optical cable 91 without making a hole in the optical fiber cable 91 in the form of a net. To detect this, an upper fence 95 may be additionally provided at the upper end of the fence structure 90. The upper fence 95 is additionally installed at the upper end of a general fence structure, and may be integrally formed with a general fence structure or may be a fence structure that is separately classified.

The upper fence 95 may be formed in some oblique shape rather than perpendicular to the ground to prevent it from penetrating over the top of the fence. Also, it may be formed in two different directions bent at the top of a normal fence structure. In this case, the two upper fences 95, which are inclined in two directions different from the general fence structure, can be approximately Y-shaped. When the upper fence 95 is tilted, when an intruder hits the upper fence 95 and applies an external force, the intruder is weighted in a direction perpendicular to the surface of the upper fence.

The cable bending inducing apparatus of the present invention is a device for causing the optical cable 91 to bend by a pressure in a direction perpendicular to the plane of the upper fence 95. Specifically, the cable bending inducing device of the present invention can be used as a top fixing pillar 96 for fixing the upper fence 95. The cable bending inducing device of the present invention is coupled or extended to the upper end of a column 94 of a typical fence structure. The upper fence 95 may be installed as a support column of the cable bending inducing device of the present invention formed at appropriate intervals.

In the present specification, the direction in which the upper fence 95 and the cable bending inducing device stand against the ground is referred to as a first direction d1. The direction perpendicular to the plane of the upper fence is referred to as a second direction d2. Here, the first direction d1 and the second direction d2 may be perpendicular to each other.

In some cases, the second direction d2 may be a horizontal direction to the ground. In this case, the first direction d1 and the second direction d2 may not be orthogonal. At this time, the second direction (d2) may be a direction perpendicular to the fence structure (90). Thus, the cable bending induction device of the present invention can sense external forces at various angles.

2 is a perspective view of a cable bending induction device according to an embodiment of the present invention. 3 is an exploded perspective view of a cable bending induction device according to an embodiment of the present invention.

Referring to Figs. 2 and 3, the cable bending inducing device of the present invention will be described. The cable bending inducing device may be formed as a supporting column for supporting the upper fence, as described with reference to Fig. A plurality of cable bending inducing devices may be provided at appropriate distances, and the upper fences may be coupled and supported.

The cable bending induction device of the present invention includes a housing 200, a cover 100, a fixing piece 300, a guide member 400, and a cable 500.

The housing 200 defines a space corresponding to the cable passage therein. Specifically, the housing 200 may be formed as a column extending in the first direction d1 and forming a space therein. A plurality of openings 210 may be formed in the side surface of the housing 200. The plurality of openings 210 may be formed to face each other in the second direction d2. The plurality of openings 210 are portions through which the fixing pieces 300 to be described later pass.

The cover 100 is a structure for housing the housing 200 therein. The cover 100 may also be formed in the form of a column extending in the first direction d1 and forming a space therein. However, since the cover 100 is formed to surround the housing 200 from the outside, the cross-sectional area of the inner space is larger. The cover 100 may specifically include a first cover 101 portion and a second cover 102 portion. The first cover 101 and the second cover 102 are coupled to each other while facing each other to form an internal space, and the housing 200 can be accommodated in the internal space.

The fixing member 300 is a plate-like structure having the slits 310 formed therein. The fixing piece 300 is located inside the cover 100 and is installed to penetrate the housing 200. Specifically, one end or both ends of the fixing piece 300 are fixedly coupled to the inside of the cover 100. The fixing piece 300 penetrates the housing 200 in the second direction d2. The fixing member 300 penetrates the housing 200 through the opening 210 of the housing 200 described above. Since the fixing piece 300 and the cover 100 are fixedly coupled to each other, when the external force is applied, the fixing piece 300 and the cover 100 move integrally.

Here, the second direction d2 through which the fixing piece 300 passes through the housing 200 may be perpendicular to the first direction d1 in which the cable passage extends. However, in some cases, the second direction d2 may not be perpendicular to the first direction d1, but it is preferable that the second direction d2 is closer to the orthogonal direction. Specifically, it is preferable that the second direction (d2) forms an angle of 60 to 120 with respect to the first direction (d1).

The slit 310 of the fixing member 300 penetrates the cable 500 and exerts an external force on the cable 500 as the fixing member 300 moves to deform the shape of the cable 500. The shape and action of the slit 310 of the fixing piece 300 will be described in more detail below.

The cable 500 is located inside the cable passage of the housing 200. The cable 500 is disposed along the first direction d1 through the cable passage. A portion of the cable 500 that passes through the portion of the fixing piece 300 passing through the housing 200 is disposed along the first direction d1 through the slit 310 of the fixing piece 300. [

The cable 500 may comprise two different strands of cables 501, 502. Specifically, the cable 500 may include a first cable 501 and a second cable 502. The first and second cables 501 and 502 are all disposed along the first direction d1 in the cable passage. The first and second cables 501 and 502 may be a single strand connected to each other at portions other than the vicinity of the fixing member 300 but at least at the fixing member 300, They look like different strands placed.

FIG. 4 is a cross-sectional view of the cable bending inducing device shown in FIG. 2 cut along line AA '. Fig. 5 is an enlarged cross-sectional view of a portion of the cable bending inducing device shown in Fig. 4. Fig. FIG. 6 is a cross-sectional view of the cable bending inducing device shown in FIG. 2, taken along line BB '.

With reference to Figs. 4 to 6, the fixing member and the cable will be described in more detail.

Referring to FIG. 4, both ends of the fixing piece 300 are coupled to the inside of the cover 100. The fixing piece 300 penetrates the housing 200 through the opening 210 of the housing 200 in the second direction d2. The opening 210 of the housing 200 is formed to be larger than the cross section of the fixing piece 300 passing through the opening 210. Accordingly, the opening 210 is formed with a spacing space around the portion through which the fixing piece 300 passes.

A guide member 400 may be installed inside the cover 100. One or both ends of the guide member 400 are fixedly coupled to the inside of the cover 100. And the guide member 400 passes through the housing 200 in the second direction d2. A guide hole 220 is formed in the housing 200 so that the guide member 400 passes through the guide hole 220. The guide member 400 should penetrate the housing 200 in a direction parallel to the fixing piece 300.

The elastic body 230 may be positioned between the housing 200 and the cover 100. The elastic body 230 generates a restoring force for restoring the cover 100 to the initial position when the external force is removed after the cover 100 is moved from the initial position by the external force. Specifically, the elastic body 230 may be positioned between the housing 200 and the cover 100 in combination with the housing 200 or the cover 100. The elastic body 230 can move the cover 100 to the initial position due to the restoring force generated when the cover 100 is deformed and restored as the cover 100 moves.

The cover 100 and the fixing piece 300 can move in the second direction d2 with respect to the housing 200 by an external force. Here, the external force may be an intruder applying a pressure in the second direction d2 to the cable bending induction device or the upper fence of the present invention. Since the housing 200 is connected to the column of the fence structure, it is fixed so as not to move by an external force. However, the cover 100 and the fixing piece 300 are separated from the pillars of the fence structure, and are coupled with the upper fence and can move by external pressure.

The cover member 100 and the fixing member 300 are moved in the second direction d2 with respect to the housing 200 because the fixing member 300 and the guide member 400 pass through the housing 200 in the second direction d2, lt; RTI ID = 0.0 > (d2). < / RTI > Specifically, the cover 100 and the fixing piece 300 are orthogonal to the first direction d1, and the movement is restricted in a direction different from the second direction d2. Here, the second direction d2 corresponds to the inner and outer directions of the upper fence, and may be a direction in which the pressure is most generally applied when the intruder exceeds the upper fence. Therefore, the moving direction of the cover 100 and the fixing piece 300 is limited to the second direction d2, so that the accuracy of detection can be improved.

The position of the cover 100 and the fixing piece 300 in a state in which no external force is applied is referred to as a first position and an external force is applied to the cover 100 and the fixing piece 300, An exemplary position in which the movable member 300 moves in the second direction d2 will be referred to as a second position. 4 to 6 show that the cover 100 and the fixing piece 300 are located at the first position and FIGS. 7 to 9, which will be referred to below, show the cover 100 and the fixing piece 300, 2 < / RTI > position.

Referring to FIG. 6, a slit 310 is formed in the fixing piece 300. The slit 310 is formed to penetrate the fixing piece 300 in the first direction d1.

One end of the slit 310 extends to the end of the fixing piece 300 to be opened. A cable 500 positioned inside the cable passage through one opened end of the slit 310 is coupled to penetrate the slit 310. The width of the slit 310 may be greater than the thickness of the cable 500 so that the cable 500 may extend in the longitudinal direction within the slit 310. [ And can be formed to be movable.

The slit 310 may be formed with a release preventing portion 315 to prevent the cable 500 from being detached through an open end. The separation preventing portion 315 may be formed in the vicinity of one open end of the slit 310. In addition, the separation preventing portion 315 may be a portion formed narrower than other portions of the slit 310. Specifically, the release preventing portion 315 may be of a shape including a protruding portion protruding from the inside of the slit 310.

The width of the portion of the release preventing portion 315 may be formed to be less than or nearly equal to the thickness of the cable 500 to prevent the cable 500 from passing through the escape prevention portion 315. At least the outer jacket portion of the cable 500 is formed of a flexible material so that its shape can be deformed to some degree by an external force. Therefore, when an external force is applied to the cable 500 in the longitudinal direction of the slit 310, the thickness of the slit 310 in the width direction can be reduced, and the cable 500 can pass through the separation preventing portion 315. However, unless an appropriate external force is applied to the cable 500, the thickness of the slit 310 in the width direction becomes greater than or equal to the width of the slit 310, so that it can not pass through the escape prevention portion 315.

The other end of the slit 310 may be formed in a closed form located inside the fixing piece 300. The cable 500 preferably enters the slit 310 through one end of the slit 310 and moves to the other end of the slit 310 to be positioned.

The slit 310 may include a portion extending in the second direction d2. Specifically, the slit 310 may include a first slit portion 311 and a second slit portion 312 that extend in the second direction d2 and are spaced apart from each other. The first slit part 311 and the second slit part 312 can be connected through the connection slit part 313. Specifically, the first slit portion 311 may extend from one end portion of which one end is opened, and the other end may extend to the connection slit portion 313. The second slit part 312 may extend from the connection slit part 313 at one end and extend to the other closed end part of the slit 310 at the other end. It is preferable that the cable 500 enters the slit 310 through the opened one end portion and moves to the second slit portion 312 through the first slit portion 311 and the connection slit portion 313. Particularly, when the fixing piece 300 is located at the first position, the cable 500 preferably penetrates the other end of the second slit part 312, that is, the other end part of the slit 310.

Referring to FIGS. 5 and 6, when the fixing piece 300 is positioned at the first position, at least a part of the slit 310 is located inside the cable passage. In particular, the other end of the slit 310 is preferably located inside the cable passage when the fixing piece 300 is positioned at the first position.

Therefore, when the fixing piece 300 is positioned at the first position, if the cable 500 penetrates the other end of the slit 310, the cable 500 is moved in the first direction d1 without departing from the inside of the cable passage . In this state, bending hardly occurs in the cable 500, and the optical signal flowing through the cable 500 hardly changes.

Hereinafter, with reference to Figs. 7 to 9, the state in which the cover and the fixed member are moved to the second position will be described.

FIG. 7 is a cross-sectional view illustrating a state in which the cover and the fixing member of the cable bending inducing device shown in FIG. 4 are moved to the second position. Fig. 8 is an enlarged cross-sectional view of a portion of the cable bending inducing device shown in Fig. 7; FIG. 9 is a cross-sectional view illustrating a state in which the cover and the fixing member of the cable bending inducing device shown in FIG. 6 are moved to the second position.

7 to 9, the cover 100 and the fixing piece 300 move in the second direction d2 relative to the first position and are located at the second position. Here, the second position may be one of a plurality of positions different from the first position moved in the second direction d2 as compared to the first position. The cover 100 and the fixing piece 300 are moved to the second position by the pressure that can be applied when the intruder crosses the upper fence 95. [ The cover member 100 and the fixing member 300 are moved in the second direction d2 with respect to the housing 200 because the fixing member 300 and the guide member 400 pass through the housing 200 in the second direction d2, (d2).

As the fixing piece 300 moves to the second position, when the fixing piece 300 is positioned at the first position, a part of the fixing piece 300 positioned inside the cable passage is positioned outside the cable passage . Specifically, when the slit 310 of the portion through which the cable 500 penetrates is positioned inside the cable passage when the fixing piece 300 is positioned at the first position, the fixing piece 300 moves to the second position It may be located outside the cable passage. More specifically, the cable 500 penetrates the other end portion of the slit 310, and the other end portion of the slit 310 is located inside the cable passage when the fixing piece 300 is positioned at the first position When the fixing piece 300 moves to the second position, it can be positioned outside the cable passage.

Accordingly, when the fixing piece 300 is positioned at the first position, the cable 510 passing through the slit 310 is positioned inside the cable passage, and the fixing piece 300 is moved to the second position It is located outside the cable passage. As the slit 310 moves in the second direction d2 the slit 310 can push the cable 510 through the slit 310 in the second direction d2, The cable 510 passing through the cable 310 can be pushed out to the outside of the cable passage.

The cable 510 pushed out of the cable passage is discharged to the outside through the opening 210 of the housing 200. The opening 210 of the housing 200 is formed to be larger than the cross section of the fixing piece 300 passing through the opening 210. Accordingly, the opening 210 is formed with a spacing space around the portion through which the fixing piece 300 passes. The cable 500 flows out of the cable passage through the spacing space formed between the inner peripheral surface of the opening 210 and the fixing piece 300.

The cable 500 may be deformed as the cable 500 is pushed out of the cable passage. Specifically, when the cable 500 is pushed out of the cable passage, the cable 510 passing through the slit 310 is bent. Also, the cable 515 passing through the opening 210 of the housing 200 is bent. The extent to which the cable 500 is bent can be determined according to the extent to which the cover 100 and the fixing piece 300 are moved in the second direction d2. For example, when the cover 100 and the fixing piece 300 are slightly moved in the second direction d2, the cable 500 is relatively slightly bent, and the cover 100 and the fixing piece 300 are bent When the cable 500 is moved in the direction d2, the cable 500 is relatively bent.

As shown in FIGS. 7-9, when the cable 500 has two strands, bending can be induced or induced in only one of the two strands. Specifically, the cable 501 in the second direction d2 of the two strands is bent more than the other cable 502. It is possible to detect in which direction the cover 100 and the fixing piece 300 are moved through the difference in the presence or the degree of bending for each cable. Therefore, it is possible to know in which direction the external force is applied to the cable bending inducing device, and to predict the intruder type. The movement of the cover 100 and the fixing piece 300 in the direction d3 opposite to the second direction d2 will be further described below with reference to Figs. 8 and 9. Fig.

As the cable 500 is bent, the optical signal flowing through the bent portion is changed. Specifically, the intensity of the forward optical signal of the optical signal is weakened, and back scattering occurs depending on the degree of bending at the bent position. The OTDR device connected to one end or both ends of the cable 500 senses the change of the optical signal and can detect the bent position of the cable 500.

When the cover 100 moves to the second position, the elastic body 230 is deformed. Specifically, the elastic body 230 may be pressed by the cover 100 to deform its shape. When the external force is removed, the cover 100 can be returned to the first position by the force to restore the elastic body 230. As the cover 100 and the fixing piece 300 are returned to the first position, the bending that has been caused in the cable 500 can be removed.

The cable 500 is positioned inside the cover 100 even if the cover 100 and the fixing piece 300 move in the second direction d2 and bending of the cable 500 is caused as described above. In addition, the bending of the cable 500 is caused by the housing 200, the fixing piece 300, and the like, which is also located inside the cover 100. Therefore, in order to prevent the cable 500 from bending, it is necessary to disassemble the cover 100 in order to release or damage the device causing the bending of the cable 500, which is very difficult. Also, the cover 100 and the fixing piece 300 are easily moved in the second direction d2 due to an external force applied to the cover 100 while disassembling the cover 100, which may cause bending of the cable 500.

Hereinafter, the state in which the cover 100 and the fixing piece 300 are moved to the third position will be described with reference to FIGS. 10 to 12. FIG.

FIG. 10 is a cross-sectional view of the cable bending inducing device shown in FIG. 4 when the cover and the fixing member are moved to the third position. Fig. 11 is an enlarged cross-sectional view of a portion of the cable bending inducing device shown in Fig. 10; Fig. FIG. 12 is a cross-sectional view illustrating a state in which the cover and the fixing member of the cable bending inducing device shown in FIG. 6 are moved to the third position.

The fact that the cover 100 and the fixing piece 300 are located at the third position means that the cover 100 and the fixing piece 300 move from the first position to the opposite direction d3 of the second direction d2 . Specifically, when the cover 100 and the fixing piece 300 are moved to the inside of the fence with respect to the housing 200 and are positioned at the second position, the cover 100 and the fixing piece 300 are moved to the housing 200 It may move to the outside of the fence and be located at the third position.

The fixed piece 300 may have two slits 310 spaced apart from each other. Specifically, the slit 310 may include a first slit 310 and a second slit 310. The first and second slits 310 are formed in the fixing piece 300 in the second direction d2, and may be formed in a symmetrical shape.

The first and second cables 501 and 502 penetrate through the first and second slits, respectively. The first and second cables 501 and 502 passing through the first and second slits 310 are spaced apart in the second direction d2.

When the cover 100 and the fixing piece 300 are positioned at the first position, both of the first and second cables 501 and 502 passing through the first and second slits 310 are located inside the cable passage . Therefore, in this state, bending hardly occurs in the cable 500, and the optical signal flowing through the cable 500 hardly changes.

6 and 7, when the cover 100 and the fixing piece 300 are positioned at the second position, the first cable 501 is pushed by the first slit 310, . Therefore, bending is induced in the first cable 510 passing through the first slit 310 and the cable 515 passing through the opening 210 of the housing 200.

On the other hand, even if the cover 100 and the fixing piece 300 are placed in the second position, the portion of the second slit 310 through which the second cable 502 passes is still located inside the cable passage. Therefore, bending hardly occurs in the second cable 502 passing through the second slit 310.

8 and 9, when the cover 100 and the fixing piece 300 are positioned at the third position, the second cable 502 is pushed by the second slit 310, . Therefore, bending is caused in the second cable 520 passing through the second slit 310 and the cable 525 passing through the opening 210 of the housing 200.

On the other hand, even if the cover 100 and the fixing piece 300 are positioned at the third position, the portion of the first slit 310 through which the first cable 501 passes is still located inside the cable passage. Therefore, bending hardly occurs in the first cable 510 at the portion passing through the first slit 310.

In this way, it is possible to detect in which direction the cover 100 and the fixing piece 300 have moved through which of the first and second cables 501 and 502 has more bending occurred on the cable 500. Therefore, it is possible to know in which direction the external force is applied to the cable bending inducing device, and to predict the intruder type.

The embodiments of the cable bending inducing device of the present invention have been described above. The present invention is not limited to the above-described embodiments and the accompanying drawings, and various modifications and changes may be made by those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be determined by the equivalents of the claims and the claims.

100: cover 101: first cover
102: second cover
200: housing 210: opening
220: Guide hole 230: Elastic body
300: spacing pin 310: slit
311: first slit part 312: second slit part
313: connecting slit part 315:
400: guide member
500: Cable

Claims (24)

A housing defining a cable passage extending therein in a first direction;
A cover for accommodating the housing therein;
A fastening piece fixedly coupled to the cover, the fastening piece passing through the housing in a second direction and having a slit formed therein; And
A cable disposed along the first direction through the cable passage and through the slit,
The cover and the fixing piece may be located at a first position and may move in the second direction with respect to the housing and be located at a second position when an external force is applied,
At least a part of the slit is located inside the cable passage when the cover and the fixing member are located at the first position and is located outside the cable passage when the cover and the fixing member are located at the second position A cable bending inducing device.
The method according to claim 1,
The cable passing through the slit is positioned inside the cable passage when the cover and the fixing member are located at the first position, and when the cover and the fixing member are positioned at the second position, Wherein the cable bending induction device is located at a first position.
3. The method of claim 2,
When the cover and the fixing member are positioned at the second position,
Wherein the cable is bent at a portion passing through the slit.
3. The method of claim 2,
The housing including an opening through which the fastener passes,
And the cable passing through the slit is positioned outside the cable passage through the opening when the cover and the fixing member are located at the second position.
5. The method of claim 4,
When the cover and the fixing member are positioned at the second position,
Wherein the cable is bent at a portion passing through the opening.
5. The method of claim 4,
Wherein the opening is formed to be larger than the fixing piece of the portion passing through the opening, and a space is formed between the inner peripheral surface of the opening and the fixing piece.
The method according to claim 6,
When the cover and the fixing member are positioned at the second position,
And a cable penetrating through the slit extends outwardly through the spacing space.
The method according to claim 1,
Wherein the slit has one end extended to an end of the fixing piece to be opened.
9. The method of claim 8,
And the slit includes a separation preventing portion formed to be narrower than other portions so that the cable is not released through the open end.
10. The method of claim 9,
And the release preventing portion is formed at one end side of the slit.
10. The method of claim 9,
And the release preventing portion includes a protrusion protruding from the inside of the slit.
9. The method of claim 8,
And the other end of the slit is located inside the fixing member and closed.
13. The method of claim 12,
And the other end of the slit is located inside the cable passage when the cover and the fixing member are located at the first position and is located outside the cable passage when the cover and the fixing member are located at the second position Cable bending inducing device.
The method according to claim 1,
Wherein the slit includes a first slit extending in the second direction.
15. The method of claim 14,
Wherein the slit further includes a second slit portion spaced apart from the first slit portion and extending in the second direction, and a connection slit portion connecting the first slit portion and the second slit portion.
14. The method of claim 13,
Wherein one end of the first slit portion is extended to an end of the fixing member to open, and the other end portion extends to the connection slit portion,
Wherein one end portion of the second slit portion extends from the connection slit portion and the other end portion of the second slit portion is located inside the fixing member and is closed.
The method according to claim 1,
Wherein the first direction and the second direction are orthogonal to each other.
18. The method of claim 17,
Wherein the cover and the fixing piece are orthogonal to the first direction and the movement is restricted in a third direction different from the second direction.
The method according to claim 1,
Further comprising a guide member fixedly coupled to the cover and extending in the second direction within the cover,
Wherein the housing includes a guide hole through which the guide member passes.
The method according to claim 1,
Wherein the cover includes a first cover portion and a second cover portion coupled to each other to form an inner space.
The method according to claim 1,
And an elastic body positioned between the housing and the cover to restore the housing to the first position.
The method according to claim 1,
Wherein the cable comprises a first cable and a second cable spaced apart in the second direction,
Wherein the first cable and the second cable each penetrate the first slit and the second slit separated from each other.
23. The method of claim 22,
The cover and the fixing piece may move in a third direction opposite to the second direction with respect to the housing when an external force is applied,
When the cover and the fixing member are positioned at the third position, the cover and the fixing member are positioned outside the cable passage,
When the cover and the fixing member are positioned at the second position, more bending is caused on the first cable than the second cable,
And wherein when the cover and the fixture are in the third position, further bending is induced in the second cable than the first cable.
The method according to claim 1,
Wherein the cable bending inducing device is installed in a bent shape at an upper end of a fence structure installed in a direction perpendicular to the ground,
And the second direction is a horizontal direction to the ground.

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