GB2538662A

GB2538662A - Trough, cable laying structure, and cable laying method

Info

Publication number: GB2538662A
Application number: GB1615215.9A
Authority: GB
Inventors: Wada Naoto; Kozawa Satoshi; Ikeuchi Masato; Hagiwara Takuzo; Usami Takayuki; ando Kazuya
Original assignee: Furukawa Electric Co Ltd
Current assignee: Furukawa Electric Co Ltd
Priority date: 2014-03-12
Filing date: 2014-03-12
Publication date: 2016-11-23
Anticipated expiration: 2034-03-12
Also published as: JP5855321B1; JPWO2015136636A1; GB2538662B; GB201615215D0; WO2015136636A1

Abstract

A main body portion (2) of a trough (1) mainly consists of side wall portions (5), a base portion (7), fitting portions (11a, 11b), cable bend members (9), and so on. The side wall portions (5) respectively rise on both sides of the base portion (7) substantially vertically with respect to the base portion (7). The cable bend members (9) rise on an upper surface of the base portion (7) (in the rising direction of the side wall portions (5)). A cable (17) is alternately hooked to the cable bend members (9), which are provided in a laid direction of the trough (1), at intervals of a predetermined number of the cable bend members (9). That is, the cable (17) is laid so as to meander with respect to the laid direction of the trough (1). In this case, as shown in Fig. 5, since the cable (17) contacts the cable bend members (9), this generates resistance when the cable (17) is pulled out and makes it possible to oppose the pull force acting on the cable (17).

Description

TROUGH, CABLE LAYING STRUCTURE, AND CABLE LAYING METHOD

TECHNICAL FIELD OF THE INVENTION

[0001] This invention relates to troughs that accommodate cables therein, and the like.

BACKGROUND OF THE INVENTION

[0002] Troughs, which are made of resin for example, are conventionally laid along railway tracks and roadsides to hold various types of cables within the interior. Such a trough usually has a fixed lid that prevents foreign substances from entering into the trough, mischief on the cables, and the like. These lids are fixed by fixing members such as bolts or receiving metal fittings such as clips (See Patent Documents 1 and 2 for example).

RE I ATE D ART

PATENT DOCUMENTS

[0003] [Patent Document 11 Japanese Unexamined Patent Application Publication No.2005-94958 (JP-A-2005-94958) 1Patent Document 21 Japanese Unexamined Patent Application Publication No.2008-199756 P -A -2008 -199756)

SUMMARY OF THE INVENTION

(PROBLEMS TO BE SOLVED BY THE INVENTION) [0004] However, stealing or cables inside troughs has been an issue in recent years. One way or stealing a cable is, for example, to take out the lids at two places with a predetermined interval in-between in a laying direction of the troughs, cut the cable at the each part, and then pull out the cable from one side. The cable is pulled out and taken away in this way. [005]

As a countermeasure, a fixing tool that cannot be unfixed without using a special tool is used to make it difficult to open the lids. However, as mentioned above, since it is unnecessary to take out the lids over the entire length of the cable to be pulled out, a few improvements on the fixing method of the lids have never been enough to prevent cable theft because it is necessary to take out only a part of the lids.

[00061 The present invention was achieved in view of such problems. Its object is to provide troughs and the like that make stealing of the cable difficult.

MEANS FOR SOT VTNG PROBLEMS

[00071 To achieve the above object, a first invention is a trough that accommodates a cable within the interior thereof. The trough includes a base portion and side wall portions that rise on both sides of the base portion. On the upper surface of the base portion between the side wall portions, a cable bending member rises. The cable bending member is a part that bends the cable, and this cable bending member may be provided integrally with the trough body or may be provided as a separate body.

Preferably, the cable bending member has a tapered shape in which the tip side is thinner than the base portion side.

[00091 Preferably, the cable bending member is provided at the center of the width direction of the base portion.

A plurality or the cable bending members may be arranged in the longitudinal direction of the trough at predetermined intervals.

[00111 The size of the cable bending member in the longitudinal direction of the trough may be larger than the size of the cable bending member in the width di rection or the trough.

[00121 The cable bending member may have a multi-layer structure and may include a post that is fixed to the base portion and a cylindrical body that is detachable from the post.

[00131 The cable bending member may include a post portion that rises upward from the base portion and a projecting portion that protrudes toward the direction vertical to the rising direction of the post portion.

[00141 The trough may have a lid portion. At the head part of the cable bending member, a fixing portion may be provided and a hole may be provided at a part of the lid portion that corresponds to the fixing portion A fixing member may be inserted from the upper part of the lid portion into the hole so that the lid can be fixed to the fixing portion.

The cable bending member may include a rotating shalt, a rotating portion that rotates around the rotating shaft, and a rotation-restricting portion that restricts the rotational angle of the rotating portion so that the rotating portion rotates in contacting with the cable.

[00161 According to the first invention, since the cable bending member rises inside the trough, the cable can wind with the use of the cable bending member when laid inside the trough. Thus, due to the contact between the cable and the cable bending member, the resistance against the pulling force acting on the cable can be increased. Consequently, this makes it difficult to pull the cable in one direction out of the trough. As a result, the cable theft can be prevented.

[00171 In addition, making the cable bending member in a tapered shape, in which the cable bending member tapers from the base portion side toward the tip side, facilitate the accommodating operation in accommodating the cable inside the trough.

[00181 In addition, since the cable bending member is formed at the center of the width direction of the base portion, the cable can wind equally with respect to the trough width direction.

In addition, by arranging a plurality of the cable bending members in the trough longitudinal direction at the predetermined intervals, the cable can wind with a pitch that is shorter than the length of the trough. By decreasing the winding pitch of the cable, the cable is bent repeatedly alternating over at the every predetermined number of the cable bending members, and thus the resistance against the pulling force can be increased when the cable is pulled out.

Here, if the size of the cable bending member in the trough width direction is decreased, the space between the side wall and the cable bending member is widened and thus the accommodating capacity for the cable increases. Also, increasing the size of the cable bending member in the trough longitudinal direction increases the contacting area between the cable and the cable bending member and this can increase the resistance against the pulling force acting on the cable. Thus, making the size of the cable bending member in the longitudinal direction of the trough larger than the size thereof in the width direction or the trough can increase the resistance against the pulling force acting on the cable as well as ensuring the accommodation capacity for the cable.

[00211 Also, having the multi-layer structure for the cable bending member with the cylindrical body that can be detachable from the post portion enables to adjust the size of the cable bending member easily. For example, if the trough is manufactured by press processing and the trough main body and the cable bending member are formed integrally, it is difficult to make the cable bending member in large size for manufacturing reasons. I n such a case, the cable bending member of a desired size can be obtained by covering with the cylindrical body according to the required size of the cable bending member.

[00221 Also, the cable bending member can be formed of a post portion and a projecting portion. That is, the projecting portion may come into contact with the cable to increase the resistance against the pulling force acting on the cable. This projecting portion may be processed integrally with the post portion or may be detachable.

[00231 Also, in addition to the conventional method of fixing the trough main body with the lid portion, fixing the head part of the cable bending member with the lid portion by a fixing member such as a bolt can fix the lid portion further firmly compared to the case in which only the conventional fixing method is used.

[00241 Also, by forming the cable bending member with a rotational shaft and a rotating portion, the rotating portion rotates when the cable is pulled. This puts the cable between the rotating portion and the side wall portion and can resist the pulling force acting on the cable.

A second invention is a cable laying structure including the trough according to the first invention and a cable that is accommodated by the trough. A plurality or the troughs are connected in the longitudinal direction and the cable is hooked to the cable bending members inside the trough. The cable is hooked over at every predetermined number of the cable bending members alternately and is laid winding in the laying direction of the trough.

[00261 The cable bending members may be formed at substantially equal intervals in the longitudinal direction of the cable laying structure.

[00271 The third invention is a cable laying method in which a plurality of the troughs according to the first invention are connected and arranged in a longitudinal direction and a cable is hooked to at least a part of the cable bending members. The cable is hooked over at every predetermined number of the cable bending member alternately and are laid winding in the laying direction of the trough. Here, if the bending radius of the bent part of the cable laid is ten times the diameter or the cable or more, which is then equal to or more than the allowable bending radius, the cable may not be damaged.

[00281 According to the second and third inventions, a cable laying structure that makes difficult to pull out a cable can be obtained.

At this time, if the cable bending members are arranged at substantially equal intervals in the longitudinal direction or the cable laying structure, the cable can wind with a fixed curvature. Alternatively, if the cable bending members are arranged at unequal intervals in the longitudinal direction of the cable laying structure, a strongly bent part can be formed at some parts of the cable and thus the resistance against the pulling force acting on the cable can be increased.

F WE CTS OF"111-1E INVENTION [00301 The present invention can provide troughs and the like that make stealing of the cable difficult.

PRI FE DESCRIPTION OF DRAWINGS 100311

FTG. 1 is an exploded perspective view showing a trough 1.

FIG. 2 is a plan view or the trough 1.

FIG. 3 is a cross sectional view of a cable bending member 9.

FIG. 4 is a plan view showing a cable laying structure 10.

FIG. 5 is a cross sectional view showing the cable laying structure 10.

FIG. 6 is a plan view showing a cable laying structure 10a.

FIG. 7 is a plan view showing a cable laying structure 10b.

FIG. 8 is a cross sectional view or a cable bending member 9a.

FTG. 9 is a cross sectional view of a cable bending member 9b.

FIG. 10 is a plan view of a trough la.

FIG. 11 is a plan view of a trough lb. FIG. 12 is an exploded perspective view of a cable bending member 9d.

FIG. 13 is an exploded perspective view of a cable bending member 9e.

FIG. 14 is a plan view of a cable bending member 9f.

FIG. 15 is a plan view of a trough lc.

FIG. 16 is an enlarged view of a vicinity of the cable bending member 9f.

FIG. 17 is an enlarged view of a vicinity or the cable bending member 91.

DESCRIPTION OF SOME EMBODIMENTS

[00321 First Embodiment Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing a trough main body and a lid portion or a trough 1 according to an embodiment of the present invention. FIG. 2 is a plan view of the trough 1 without a lid portion 3.

[00331 The trough 1 mainly includes a main body 2 and the lid portion 3. The main body 2 and the lid portion 3 are made or resin, for example, and are formed by press molding or injection molding. The trough 1 is, for example, approximately 1 meter long. In the present invention, the main body 2 alone without the lid portion 3 is sometimes called simply as a trough.

[00341 The main body 2 of the trough 1 mainly includes side wall portions 5, a base portion 7, (liking portions lla and llb, cable bending members 9, and the like. On each side of the base portion 7, the side wall portion 5 rises substantially upright to the base portion 7.

[00351 In addition, the fitting portions Ila and 1lb are provided on both ends of the longitudinal direction of the main body 2. The fitting portion Ila has concave grooves and the fitting portion lib has protrusions corresponding to the concave grooves. Thus, the troughs 1 can be connected to one another by fitting the fitting portion lla of the first main body 2 with the fitting portion lib of the second adjacent main body 2.

[00361 A cable bending member 9 rises on the upper surface of the base portion 7 (in the uprising direction of the side wall portions 5). Although the cable bending members 9 are formed at two locations in the longitudinal direction of the main body 2 in the example shown by the drawing, the number of cable bending members 9 is not limited thereto in the present invention. The cable bending members 9 may be formed at a plurality of locations, three or more, in the longitudinal direction of the main body 2, or may be formed at only one location.

In addition, the cross sectional shape of the cable bending member 9 may be in any shapes other than the circular shape shown in the drawing and can be designed into, for example, a polygonal shape, such as a quadrilateral or a hexagon, or an oval shape as appropriate.

Here, the cable bending members are the parts that rise on some parts or the base portion 7 at predetermined intervals so that the cable can wind inside the main body 2. Thus, partition walls formed continuously in the longitudinal direction of the main body 2 are different from the cable bending members 9 of the present invention, since the partition walls cannot wind the cable but are rather for suppressing the winding of the cable. That is, the cable bending members 9 of the present invention are provided only at some parts or the longitudinal direction or the main body 2, and the parts in which no cable bending members 9 are formed are longer enough with respect to the entire length of the main body 2 in the longitudinal direction.

[00391 FIG. 3 is a cross sectional view cut along A-A line of FIG. 2 and is a cross sectional view of the cable bending member 9. The cable bending member 9 is formed integrally with the main body 2. That is, in forming the main body 2 by, for example, press process, the cable bending member 9 is formed at the same time.

The cable bending member 9 is preferably provided at the substantially center or the width direction of the main body 2 so that the space between the cable bending member 9 and the side wall portion 5 is the same on both right side and the left side. Consequently, the cable can wind equally both to the right and to the left when being laid as described below.

[00401 In addition, the cable bending member 9 has a tapered shape: the tip side is thinner than the base portion 7 (the base side). That is, at least the size of the cable bending member 9 in the width direction decreases toward the tip side in the cross sections of the cable bending member 9, which are parallel to the base portion 7. This facilitates placing of the cable into the main body 2 in laying the cable inside the main body 2 from the upper part of the main body 2. In addition, the molding of the cable bending member 9 by, for example, press molding is easy since materials can move easily.

A fixing portion 15a is provided at the head part of the cable bending member 9 (the vicinity of the upper end part of the cable bending member 9). The fixing portion 15a is formed by embedding a female screw member, such as a nut. The fixing portion 15a is used to be fixed with the lid portion 3.

[00421 As shown in FIG. 1, holes 13a and 13b are provided on the lid portion 3. The hole 13a is a penetrating hole provided at a part that corresponds to the above-mentioned fixing portion 15a (the cable bending member 9). The lid portion 3 can be fixed to the main body 2 by inserting a fixing member, such as a bolt, from the upper part of the hole 13a, which is then fixed with the fixing portion 15a. [00431 Similarly, the hole 13b is a penetrating hole provided at a part that corresponds to the fixing portion 151) provided on the main body 2. The lid portion 3 can be fixed to the main body 2 by inserting a fixing member, such as a bolt, from the upper part of the hole 13b, which is then fixed with the fixing portion 15b. The holes 13a and 13b are counterbores and the heads of the fixing members such as bolts do not protrude above the upper surface of the lid portion 3.

[00441 Next, a cable laying structure using the trough 1 will be described. FIG. 4 is a plan view showing a cable laying structure 10 (the lid portion 3 is not shown) and FIG. 5 is a cross sectional view of the cable bending member 9. The cable laying structure 10 has a plurality of troughs 1 connected in the longitudinal direction, and, furthermore, a cable 17 is laid inside the troughs 1. Although only the one cable 17 is laid in the example shown in the drawings, the size and the number of the cable 17 are not limited to the example shown and a plurality of various types of cables may be laid.

[00451 The cable 17 is hooked to the cable bending members 9, which are provided at a plurality of locations in the laying direction of the trough 1, alternating to the right and to the left. That is, the cable 17 is laid in such a manner to wind with respect to the laying direction of the trough 1. At this time, as shown in FIG. 5, since the cable 17 is in contact with the cable bending members 9, resistance is created when the cable 17 is pulled from one side so as to counter the pulling force applied to the cable 17.

[00461 Preferably, the height of the cable bending member 9 is approximately the same as that of the side wall portion 5. As described above, this allows a fixing member 19 to easily connect with the fixing portion 15, which is formed at the upper part of the cable bending member 9. In addition, when the lid 3 is closed, the lower surface of the lid 3 is in contact with the cable bending member 9. Thus, the cable bending member 9 can support the load applied from the upper part of the lid 3. Consequently, the withstanding load of the trough 1 can be improved.

Here, the cable bending members 9 are formed at substantially equal intervals in the longitudinal direction of the cable laying structure 10 (B in the drawing). In this way, the cable 17 can be laid in a wavy shape with a uniform pitch. Consequently, this can prevent the cable 17 from being applied locally with a strong bending force.

Given that the cable bending members 9 are arranged at equal intervals, if the cable bending member 9 is to be Firmed at one location, the cable bending member 9 is required to be arranged at the center of the longitudinal direction of the trough 1. That is, the cable bending member 9 is required to be at the equal distance from each end of the trough 1.

Also, if a plurality of the cable bending members 9 are arranged, the distance from the cable bending member 9 located at the both end sides or the longitudinal direction or the trough 1 to the ends or the trough 1 is required to be substantially half the interval between the cable bending members 9. For example, Ibr the cable bending members 9 formed at two locations, the distance from the cable bending member 9 to the end of the main body 2 (C in the drawing) is required to he half the interval between the cable bending members 9 (B in the drawing).

[00501 As another method for laying the cable 17, a cable laying structure 10a shown in FTG. 6 may be used. Tn the cable laying structure 10a, the cable 17 is laid winding alternately al: a plurality of the cable bending members 9 instead of winding alternately at the every cable bending member 9. In this way even if the cable 17 has a large allowable bending radius (the minimum bending radius to bend the cable 17, which is, for example, in the range of approximately six to ten times the radius of the cable 17 depending on the size of the cable 17) (i.e. the cable 17 has a large diameter), the cable 17 can be laid with a bending radius equal to or larger than the allowable bending radius, which is approximately ten times the radius of the cable 17. Thus no excessive bending force is applied to the cable 17 and the cable 17 can be laid still winding without any damage.

T0051T As described above, in the present invention, the cable 17 is arranged with respect to the cable bending members 9 in such a manner that the cable 17 alternates over at every predetermined number of the cable bending members 9 so that the cable 17 can be laid winding. The predetermined number or the cable bending members 9 for the cable 17 to alternate may be one, two, or three, or can be set in combination as appropriate if necessary.

[00521 Alternatively, as another method for laying the cable 17, a cable laying structure 10b shown in FIG. 7 may be used. In the cable laying structure lob, the cable bending members 9 are spaced at different intervals in the laying direction or the cable 17. That is, the distance from the cable bending member 9 that is positioned at the end side of the trough 1 to the end of the trough 1 (F in the drawing) is unequal to half the interval between the cable bending members 9 (D in the drawing) (F < D/2 in the example shown in the drawing). Thus, the cable bending members 9 are formed and arranged with the interval D at some parts and with the interval E (twice the distance 11) at other parts.

it the cable 17 is hooked to the cable bending members 9 arranged in this way so that the cable 17 alternates over at the cable bending members 9 to be laid winding, the cable 17 bends strongly at some parts. Such strongly bent parts can have larger resistance against the pulling force acting on the cable. The pitch of arrangement of the cable bending members 9 may be changed intentionally in this way. Decreasing the arrangement pitch for the cable bending members 9 can increase the resistance when the cable is pulled.

According to the first embodiment, the cable 17 can be laid winding because or the cable bending members 9. Thus, the resistance against pulling Ibrce acting on the cable 17 can be increased. As a result, theft of the cable 17 can be prevented. [00551 In addition, since the cable bending member 9 has a tapered shape, in which its diameter tapers toward the tip, and thus the cable 17 can be dropped into the trough 1 from above to be laid, accommodating the cable 17 in the trough is easy. In addition, positioning the cable bending members 9 at the center of the width direction of the trough 1 enables the cable 17 to wind equally both to the right and to the left [005G-I In addition, positioning the cable bending members 9 at equal intervals in the cable laying direction enables the cable 17 to be laid in a wavy shape with a regular pitch. This can suppress a strong bending force given to a part of the cable 17. Alternatively, the resistance against the pulling force acting on the cable 17 can be increased by intentionally bending some parts of the cable 17 strongly.

[00571 In addition, the lid portion 3 can be fixed firmly by providing the fixing portion 15a at the head of the cable bending member 9 to be fixed with the lid portion 3. [0058] In addition, if the height or the cable bending member 9 is the same as that or the side wall portion 5, then the cable bending member 9 can also support the load from the lid portion 3 when the lid portion 3 is closed. Consequently, this increases the withstanding load of the trough 1 as well as improves the rigidity of the cross sections of the trough.

[00591 Second Embodiment Next, a second embodiment will now be described. FIG. 8 is a cross sectional view showing a cable bending member 9a. Tn the embodiments below, the same notations as in RIG. 1 to FIG. 7 will be used for the structures that have the same functions as the cable bending member 9 and the like and redundant descriptions will be omitted.

[00601 The cable bending member 9a is approximately similar to the cable bending member 9 except that the cable bending member 9a is not integrated with the main body 2 but is detachable from the main body 2. The cable bending member 9a is [brined separately from the main body 2. A fixing portion 21 is provided on the base portion 7 of the main body 2. The cable bending member 9a is fixed to the fixing portion 21.

[00611 For example, a nut is embedded into the fixing portion 21 and a bolt portion is formed, or a bolt is embedded, in the lower end of the cable bending member 9a. The main body 2 is, for example, press molded and the cable bending member 9a may be molded by other method of processing. The cable bending member 9a may also be [00621 According to the second embodiment, similar effects as in the first embodiment can be obtained. In addition, since the cable bending member 9a is detachable, the cable bending member 9a can be exchanged easily. In addition, since there is no size limit for the cable bending member 9 to be molded at the time of molding the main body 2, any size of the cable bending member 9a can be used. [00631 Third Embodiment.

Next, a third embodiment will now he described. FIG. 9 is a cross sectional view showing a cable bending member 9b. The cable bending member 9b includes a post 23 and a cylindrical body 25. The post 23 is approximately similar to the cable bending member 9. The cylindrical body 25 is a member having an inner shape that corresponds to the shape or the post 23. The cylindrical body 25 is detachable From the post 23.

[00641 As described above, the cable bending member 9 is molded simultaneously with the main body 2. For this reason, the size of the cable bending member that can be molded has a limit. Thus, in this embodiment, the main body 2 and the post 23 are molded integrally up to the size that can be molded and then the cylindrical body 25 is fitted onto the post 23 to Form the cable bending member 9b. Preparing the cylindrical body 25 having the size required to act as the cable bending member 9b enables to adjust the size and the strength of the cable bending member 9h as well as the frictional force generated between the cable and the cylindrical body by the cylindrical body 25.

[00651 According to the third embodiment, the same effects as in the first embodiment can be obtained. In addition, since the cylindrical body 25 is detachable, the size of the cable bending member 9b can be changed easily according to the size and the number of the cable 17 to be laid. In addition, since it is unnecessary to mold a large sized cable bending member simultaneously with the main body 2, the manufacturability is excellent.

[0066] Fourth Embodiment Next, a fourth embodiment will now be described. FIG. 10 is a plan view of a trough la having a cable bending member 9c (the lid portion 3 is not shown). The cable bending member 9c has a cross section in a flat shape, which is different, from the substantially cylindrical shape of the cable bending member 9 and the like. [00671 In the trough la, the size of the cable bending member 9c in the longitudinal direction of the trough la (LI in the drawing) is larger than the size of the cable bending member 9c in the width direction of the trough la (G in the drawing). As such a shape, there is an ellipse, an oval shape, or a convex-lens shape, for example. Having a smaller size or the cable bending member 9c in the width direction allows the space between the cable bending member 9c and the side wall portion 5 to increase. Thus, the trough la can accommodate more of the cable 17.

[00681 Meanwhile, having a larger size of the cable bending member 9c in the longitudinal direction increases the contacting length or the cable 17 with the cable bending member 9c when the cable 17 is hooked to the cable bending member 9c. As a result, the contacting area between the two can be increased. Thus the resistance against the pulling force acting on the cable 17 can be increased.

[00691 According to the fourth embodiment the same effects as in the first embodiment can be obtained. In addition, the flat shape of the cable bending member 9c can ensure the accommodation capacity for the cable 17 and increase the resistance against the pulling of the cable.

[00701 Fifth Embodiment Next, a fifth embodiment will now be described. FIG. 11 is a plan view of a trough lb having a cable bending member 9d (the lid portion 3 is not shown). FIG. 12 is an exploded perspective view of the cable bending member 9d. The cable bending member 9d includes a post portion 27 and a projecting portion 29.

The post portion 27 has a structure that is similar to the above-mentioned cable bending member 9 and the like. However, as shown in FIG. 12, the post portion 27 has a plurality of grooves 31 formed on the peripheral surface thereof. The groove 31 is formed in a straight line in the height direction of the post portion 27. In addition, the grooves 31 are formed at a predetermined pitch in the circumferential direction and a plurality of sets of the grooves 31 are formed, in which a set is a pair of the grooves 31 facing to each other. The post portion 27 may be tapered off toward the upper end or may have a fixed diameter.

The projecting portion 29 is a plate-like member. The projecting portion 29 has a cutout formed corresponding to the post portion 27. The projecting portion 29 can be inserted into the grooves 31 that are formed on the post portion 27. In attaching the projecting portion 29 to the post portion 27, both ends of the projecting portion 29 protrude in the diameter direction of the post portion 27. The projecting portion 29 becomes the contacting part with the cable 17.

[00731 In addition, the projecting portion 29 can be inserted into any of the plurality of the grooves 31 on the post portion 27. Thus, an angle of the projecting portion 29, which protrudes in the diameter direction of the post portion 27, to the longitudinal direction of the trough can be chosen by choosing the grooves 31 into which the projecting portion 29 is inserted.

[00741 As shown in FIG. 11, the projecting portions 29 are attached to the post portion 27 in such a manner that the projecting portions 29 are in the direction along the cable laying line (I in the drawing). This allows the projecting portion 29 to act as a guide for winding the cable 17. In addition, the direction of the projecting portion 29 can be adjusted according to the winding line or the laid cable.

Alternatively, as shown in FTG. 1:3, a cable bending member 9e including a post portion 27a and a projecting portion 29a may be adopted. Instead or forming grooves on the periphery, the post portion 27a has slits 33 that penetrate the post portion 27a in its diameter direction. The slits 33 are formed in a plurality of directions on the post portion 27a. The projecting portion 29a is inserted into the slits 33. Thus, a cutout as in the projecting portion 29 is unnecessary for the projecting portion 29a.

According to the rah embodiment, the same effects as in the First, embodiment can be obtained. In addition, by Ibrming the cable bending member by inserting the projecting portion 29 or 29a into the post portion 27 or 27a, the projecting portion 29 or 29a can be arranged in the direction along the winding direction of the cable 17. [00771 If the winding direction of the cable is fixed, the post portion and the projecting portion may be formed integrally, instead of making them detachable from one another.

Sixth Embodiment Next, a sixth embodiment will now be described. FIG. 14 is a plan view of a cable bending member Of and FIG. 15 is a plan view of a trough lc having the cable bending member 9f (the lid portion 3 is not shown). The cable bending member 9f includes a post portion 27b, a rotating portion 35, and the like.

The rotating portion 35 can rotate around a rotational shaft 37 in the post portion 27b (all arrow el-in the drawing). i\rotation-restricting portion 39 is provided on the post portion 27h. The rotation-restricting portion 39 restricts the range of rotation of the rotating portion 35. That is, the rotating portion 35 can rotate only in the range of predetermined angles to the post potion 27b.

The rotating portion 35 is a projecting portion that protrudes on two sides or the post portion 271). The rotating portion 35 has rubber members 41 al, the Lips thereof. The rubber member 41 is a part to increase the friction with the outer surface of the cable 17. Preferably, the tip of the rubber member 41 is rounded to increase the contacting area with the cable 17.

As shown in FIG. 15, the cable laying line winds due to the cable bending members 91. Al. this time, since the rotation-restricting portion 39 restricts the rotation or the rotating portion 35, the state in which one or the end parts or the rotating portion 35 is in contact with the cable 17 is maintained.

[00821 FIG. 16 is an enlarged view of section K in FIG. 15, which is an enlarged view of the cable bending member 9f with the cable 17 being laid. As mentioned above, the end part of the rotating portion 35 is in contact with the cable 17. At this time, the rubber member 41 suppresses the slipping between the cable 17 and the rotating portion 35. If a pulling force (an arrow T, in the drawing) is given to the cable 17 at this state, the rotating portion 35 rotates as the cable 17 moves. [00831 FIG. 17 shows the state in which the rotating portion 35 has rotated. The length of projection of the rotating portion 35 from the post portion 27b is larger than the distance between the post portion 27b and the side wall portion 5 subtracted by the diameter of the cable 17. Thus, when the rotating portion 35 rotates (an arrow NI in the drawing), the cable 17 is held between the rotating portion 35 and the side wall portion 5. Consequently, the movement or the cable 17 is restricted and the resistance against the pulling force can be increased.

[00841 If the cable 17 is pulled in the opposite direction, the other cable bending member 9f performs the same action so that the resistance against the pulling force can be increased. That is, a plurality of the cable bending members 9f are arranged so as to be in the opposite directions to one another with respect to the laying direction or the cable 17.

[00851 According to the sixth embodiment, the same effects as in the first embodiment can be obtained. In addition, when the cable 17 is pulled, the rotating portion 35 can hold the cable 17 with the side wall portion 5 to resist the pulling of the cable 17. In addition, in laying the cable 17, there is enough space between the rotating portion 35 and the side wall portion 5 so that laying operation or the cable 17 is easy.

[00861 Although some embodiments of the present invention have been described referring to the attached drawings, the technical scope of the present invention is not limited to the embodiments described above. It is obvious that persons skilled in the art can think out various examples of Changes or modifications within the scope of the technical idea disclosed in the claims, and it will be understood that they naturally belong to the technical scope or the present invention.

DESCRIPTION OF NOTATIONS [00871

1, la, lb, lc trough 2.......... main body 3.......... lid portion 5.......... side wall portion 7.......... base portion 9, 9a, 91), 9c, 9d, 9e, Of.......... cable bending member 10, 10a, 101) .... cable laying structure lla, llb.......... fitting portion 13a, 13b hole 15a, 15b fixing portion 17. cable Fixing member 21...... Fixing portion 23 post cylindrical body 27, 27a, 27b.......... post portion 29, 29a...... projecting portion 31...... groove 33...... slit 35...... rotating portion 37 rotating shaft 39... rotation-restricting portion 41. rubber member

Claims

WHAT IS CLAIMED IS1. A trough that accommodates a cable within the interior thereof, comprising: a base portion; and side wall portions that rise on both sides of the base portion, wherein a cable bending member rises on an upper surface of the base portion between the side wall portions.
2. The trough according to claim 1, wherein: the cable bending member has a tapered shape in which the tip side is thinner than the base portion side.
3. The trough according to claim 1, wherein: the cable bending member is provided at a center of a width direction of the base portion.
4. The trough according to claim 1, wherein: a plurality of the cable bending members are arranged at predetermined intervals in a longitudinal direction of the trough.
5. The trough according to claim 1, wherein: the size of the cable bending member in a longitudinal direction of the trough is larger than the size of the cable bending member in a width direction of the trough.
6. The trough according to claim 1, wherein: the cable bending member has a multi-layer structure and includes a post that is fixed to the base portion and a cylindrical body that is detachable from the post.
7. The trough according to claim 1, wherein: the cable bending member includes a post portion that rises upward from the base portion and a projecting portion that protrudes toward the direction perpendicular to the rising direction of the post portion.
8. The trough according to claim 1, wherein: the trough has a lid portion; a fixing portion is provided at a head part of the cable bending member; a hole is provided at a part of the lid portion that corresponds to the fixing portion; and the lid can be fixed to the fixing portion by inserting a fixing member from an upper part of the lid portion into the hole.
9. The trough according to claim 1, wherein: the cable bending member includes a rotating shaft, a rotating portion that rotates around the rotating shalt, and a rotation-restricting portion that restricts the rotational angle of the rotating portion; and the rotating portion rotates in contacting with a cable.
10. A cable laying structure, comprising: the trough according to any one of claims 1 -9; and a cable that is accommodated by the trough, wherein: a plurality or the troughs are connected in a longitudinal direction; the cable is hooked to the cable bending members inside the trough, the cable being hooked over at every predetermined number of the cable bending member alternately and being laid winding in the laying direction of the trough.
11. The cable laying structure according to claim 10, wherein: the cable bending members are formed at substantially equal intervals in a longitudinal direction of a cable laying structure.
12. A cable laying method, comprising: connecting and arranging a plurality of the trough according to any one of claims 1 -9 in a longitudinal direction; and hooking a cable to at least a part or the cable bending members, the cable being hooked over at every predetermined number of the cable bending member alternately and being laid winding in the laying direction of the trough.
13. The cable laying method according to claim 12, wherein: a cable is laid in such a manner that the bending radius of a bent part of the cable laid is ten times the diameter or the cable or more.