JPH0784895B2 - Openable and closed cable drag chain - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable drag chain suitable for supporting and guiding a hose, a cable or the like (hereinafter, simply referred to as a cable) for supplying power to a moving body.

2. Description of the Related Art Conventionally, cable drag chains have been disclosed in, for example, JP-A-56-
As disclosed in Japanese Patent No. 159914, since it is housed in the drag chain by hermetically sealing the periphery of the cable and the like,
When storing cables etc. in the drag chain, it is necessary to insert the cables etc. from one end opening of the drag chain to the other end opening, and it is extremely troublesome to replace the cables etc., and it takes a lot of time. When it is necessary to repair or inspect the stored cables, etc. at their intermediate positions, it is impossible to inspect and repair unless the entire length of the cables, etc. is pulled out from the drag chain. Had.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is directed to respective link bodies constituting a drag chain,
That is, a link body composed of a pair of link plates spaced apart and opposed to each other on the both sides and a pair of coupling rods for vertically coupling the pair of link plates is disassembled into four pieces, whereby both ends of a cable or the like are separated. In the state where the fixed end and the movable end are connected, the link body can be assembled by surrounding the cables and the respective link bodies can be connected to form a drag tune in which the cables and the like are housed, and at the same time move with the fixed end. To the drag chain already erected between the end,
By opening the upper side connecting rod and twisting the cable etc. from above, it can be stored without entanglement, and by further opening and closing the other end with one end of the connecting rod that connects the upper side of the link plate in a pivoted state, It is an object of the present invention to make it possible to inspect and repair a cable or the like stored in a drag chain even at an intermediate position and to easily replace a link body at the intermediate position.

Means for Solving the Problems In order to achieve the above-mentioned object, firstly, a large number of link bodies in which the upper side and the lower side of a pair of spaced-apart link plates are connected to each other by a connecting rod are freely bendable. In a cable drag chain that is connected to accommodate a cable, a hose, etc., a pair of link plates are provided with connection recesses that can be fitted into and removed from each other on one of the inner surfaces facing one end and the other end on the opposite side of the back side. The upper side connecting rods that connect the upper sides of the link plates to each other are removably and rotatably attached to the link plates, and both ends of the lower side connecting rods that connect the lower sides of the link plates to each other are respectively attached to the link plates. An openable cable drag chain that is detachably attached to each of the above-mentioned upper and lower side connecting rods and is provided with a cover formed with arc surfaces that overlap each other next to each other. Secondly, in a cable drag chain that stores a cable, a hose, etc. inside by flexibly connecting a large number of link bodies in which upper and lower sides of a pair of spaced apart and opposed link plates are joined together by a connecting rod, The pair of link plates are provided with connection recesses that can be fitted into and removed from each other on the inner surface facing one end and the diametrically outer surface on the other end, and one end of an upper side connecting rod that connects the upper sides of the link plates to each other is provided. Of the lower side connecting rod which is removably attached to the link plate and is rotatably mounted, and the other end of the upper side connecting rod is removably attached to the other link plate, and the lower sides of the link plates are mutually connected. Both ends are removably attached to the respective link plates, and opposite side surfaces of one end portion of the pair of link plates and the other end portions of the pair of link plates adjacent to the link plate. A stopper mechanism that has a contact surface and an abutted surface symmetrically with respect to the center of rotation of the link plate between them and restricts mutual rotation, and is directed inward on the upper side of the one link plate. A first and a second hinge element which are complementary to each other between the projecting piece formed as described above and one end of the upper piece connecting rod, and the latch mechanism is provided between the other end of the upper side connecting rod and the upper side of the other link plate. The above-mentioned problems have been solved by an openable and closable cable drag chain.

Since the pair of left and right link plates and the pair of upper and lower connecting rods that constitute the action link body are all fitted and removed so that they can be disassembled and assembled, a cable or the like having one end fixed and the other end attached to the moving body is drag chain. When it is hermetically sealed inside, the connecting recesses formed on the inner and outer surfaces of the adjacent ends of each of the multiple link plates are overlapped with each other in a bendable manner, and the lower side of the lower side of the pair of link plates facing each other. A drag chain storing cables etc. by fitting both ends of the connecting rod into a bendable trough to store cables etc., and then fitting both ends of the upper side coupling rod to a pair of link plates. Can be assembled.

When removing the drag chain from a cable or the like, the upper side connecting rod is unwound from the one end of the upper side connecting rod which is rotatably fitted, and the other end is rotated to rotate the upper side connecting rod. Open and remove the trough-shaped drag chain from the cable, etc. Further, when exchanging a part of the link body of the drag chain accommodating the cables and the like, as described above, after opening the upper side connecting rod and removing the pivotal support, the lower side connecting rod is removed and the adjacent link is connected. By separating the coupling recessed portions of the plates that are fitted together, the two link plates and the two connecting rods can be disassembled into four pieces, so that the link bodies can be partially mounted and removed.

Practical Examples FIGS. 1 to 9 show an embodiment of the present invention, FIG. 1 is a front view showing a bent state of an inner surface of a link plate of a cable drag chain, and FIG. 2 is an enlarged perspective view of an essential part of the drag chain. Fig. 3 is an exploded perspective view of the link body,
(A) is an upper piece connecting rod, (b) and (c) are a pair of link plates spaced apart and facing each other, (d) is a partition plate installed upright between the upper side connecting rod and the lower side connecting rod, (e) Is a lower side connecting rod, FIG. 4 (a) is an inner side view of a link plate having a pivot portion of the upper side connecting rod, and FIG.
FIG. 5 is a plan sectional view in which end portions of adjacent link plates are superposed and connected, and FIG. 6 is a view of a removable and rotatable mounting portion between one end of the upper side connecting rod and the upper side of one link plate. It is a perspective view of a part, (a) is one end of the upper side connecting rod,
(B) is the upper side of the link plate, and FIG. 7 is a perspective view of the other end of the upper side connecting rod, the upper side of the other link plate, and the main part of the attachable / detachable mounting portion, and (a) of the upper side connecting rod. The other end, (b) is the upper side of the other link plate, and
The figure shows another embodiment in which the upper side connecting rod can be disassembled into two members. (A) is a perspective view of the upper cover member, (b) is a perspective view of the upper side connecting member, and FIG. 9 is a lower side connecting member. It is another embodiment in which the rod can be disassembled into two members, (a) is a perspective view of a lower side connecting member, and (b) is a perspective view of a lower surface cover member.

The cable drag chain 1 for accommodating and supporting the cables and the like shown in FIG. 1 superimposes and connects the ends of a large number of link bodies 2 with each other and connects them sequentially with a connecting pin 3, and each link body 2 is a cable. Fixed end F and moving end M of drag chain 1
, And is mutually bendable in one direction, for example, downward as shown, but is not bendable in the other direction, for example, upward, and is connected to each other.

As shown in FIG. 2, each link body 2 includes a pair of spaced-apart link plates 4a, 4b, an upper side connecting rod 6 for connecting the upper sides of both link plates 4a, 4b to each other in a removable manner, and both links. A lower side connecting rod (7) for connecting the lower sides of the plates (4a, 4b) to each other so that they can be fitted to each other; There is.

The upper side connecting rod 6 is rotatably fitted around the upper side of one of the link plates 4a, and the inner connecting recesses 9 are formed on the opposite side faces of the one ends of all the link plates.
A snap engagement connecting pin 3 is projectingly provided on the inner surface of the link plate, and an outer connecting concave portion 10 formed on the opposite outer surface of the other end of the link plate has a snap-fitting pin hole 3'for fitting and removing the connecting pin 3.
As shown in FIG. 5, the inner connecting concave portion 9 and the outer connecting concave portion 10 of adjacent link plates are superposed and connected to each other so that the connecting pin 3 is fitted into the pin hole 3'and snap-engaged. As a result, the respective link bodies 2 are connected to form the cable drag chain 1 as shown in FIG.

Each link body 2 has a cover part as shown in FIG.
The upper side connecting rod 6 having 6c, the pair of spaced apart and opposed link plates 4a, 4b, the partition plate 8, and the lower side connecting rod 7 having the cover portion 7b are assembled into one end portion of the pair of link plates 4a, 4b. As shown in FIG. 4, a connecting pin 3 is projected in the inner connecting concave portion 9 provided on the side surface, and the cable drag chain 1 is unidirectionally arranged at symmetric positions on both sides of the pin 3, for example, the chain 1 in FIG. As described above, the first bending restriction surfaces 11 and 11 'for restricting the downward bending angle, and the first inversion prevention surfaces 12 and 12' for preventing the chain 1 in the opposite direction, for example, the chain 1 in FIG. 1 from being bent upward. And a second bending restriction surface 14 that restricts the downward bending angle of the chain in cooperation with the first bending restriction surfaces 11 and 11 '. , In cooperation with the first reversal prevention surface 12, 12 '. A fan-shaped notch recess 16 having a second reversal blocking surface 15 that prevents upward bending of the vane is provided.

On the other hand, in the other end outer connecting recess 10 of the pair of link plates 4a, 4b, a snap lock pin hole 3'for inserting the snap engaging connecting pin 3 and a stopper receiving recess 13 are rotatably loosely fitted. And a fan-shaped stopper 17 protruding in the diameter and a fan-shaped stopper 18 rotatably fitted in the fan-shaped notch recess 16 are formed, and the boat-shaped stopper 17 includes the first bending restriction surface 11, The first bending stopper surface 19, 1 that pivotally contacts the 11 '
9'and the first reversal stopper surfaces 20, 20 'which are in rotary contact with the first reversal prevention surfaces 12, 12' are formed in a straight line converging in the tip direction, and the fan-shaped stopper 18 is provided. A second bending stopper surface 21 that pivotally contacts the second bending restriction surface 14 and a second reversal stopper surface 22 that pivotally contacts the second reversal blocking surface 15 are formed on the.

Therefore, the inner connecting recess 9 at one end of the link plate and the outer connecting recess 10 at the other end of the link plate that are adjacent to each other in the longitudinal direction are separated by the fifth part.
As shown in the figure, the connecting pin 3
By being inserted into the pin hole 3'and snap-engaged, the adjacent link plates are rotatably connected to each other, and the first bending restriction surfaces 11, 11 'and the first bending stopper surface 19 are connected. , 19 'and the pivotal contact between the second bending restriction surface 14 and the second bending stopper surface 21 causes the cable drag chain 1 to have a maximum downward bending degree as shown in FIG. Is regulated, and the first reversal prevention surface 12, 12 'and the first
The cable drag chain 1 is moved from the direction shown in FIG. 1 by the rotational contact with the reverse stopper surfaces 20, 20 'and the rotational contact between the second reverse blocking surface 15 and the second reverse stopper surface 22. It cannot be inverted and bent upwards, so the chain does not stiffen linearly and the intermediate portion hangs downward.

By making the radius of the other end circular arc surface 10 'smaller than the radius of the one end circular arc surface 9'of the link plates 4a, 4b, it is possible to increase the downward bendable angle between the adjacent link plates. As a result, the bending radius of the chain 1 can be reduced, and the circular arc surface 10 '
By making the radius smaller, the bending rotation guide surface of the arcuate surface 9'of the adjacent link plates can be lengthened, so that the bending guide between the link plates can be smoothly and reliably performed.

Further, an upper side pivotal support portion into which one end of the upper side connecting rod 6 is removably and rotatably fitted and inserted into the upper side of one of the link plates 4a.
23 and a lower side fitting portion 24 having a cover portion 24 'for removably fitting one end of the lower side connecting rod 7 and the other end of the upper side connecting rod 6 to the upper side of the other link plate 4b. The lower side fitting portion 26 is provided with a snap locking portion 25 that enables it and a cover portion 26 'that allows the other end of the lower side connecting rod 7 to be fitted and removed.

Then, as shown in FIG. 6 (a), a pair of rotating shaft portions 27, 27 fitted to the upper side pivotally supporting portion 23 and a rotation guide concave surface 28 are provided at the one end extending portions 6a, 6b of the upper side connecting rod 6. And a snap locking projection 29 projecting on the concave surface is provided, and the upper side pivotal support portion 23 of one of the link plates 4a has the rotation shaft of the upper coupling rod 6 as shown in FIG. 6 (b). Bearing surfaces 30, 30 for rotationally supporting the portions 27, 27, and rotational guide convex surface 31 of the rotational guide concave surface 28.
And the snap locking recess 32 of the snap projection 29, and therefore, one end of the upper side connecting rod 6 has a rotating shaft portion.
The fitting between 27 and 27 and bearing surfaces 30 and 30 prevents movement in the front-rear, left-right direction and downward, snap engagement between snap projection 29 and snap locking recess 32, and rotation guide concave surface 28 and rotation guide convex surface. Since the upper surface is prevented from floating upward by the sliding contact with the lower surface of 31, the end of the upper side connecting rod 6 and the upper side of the ring plate 4a are fixedly connected and are not separated.

However, by opening the other end of the upper side connecting rod 6 upward,
The engagement between the snap projection 29 and the snap locking recess 32 is disengaged, the rotation guide concave surface 28 is slidably guided by the rotation guide convex surface 31, and the rotation shaft portions 27, 27 are supported by the bearing surfaces 30, 30. It becomes rotatable,
When the one end extending portions 6a, 6a of the upper side joint rod 6 abut on the inner side 33, 33 of the upper side of the link plate 4a, the open standing rotation position of the upper side joint rod 6 is regulated, and at the same time, the upper side joint is held at that position. It is possible to insert and remove one end of the rod 6.

In addition, in the inverted position of the upper side connecting rod 6, the upper side connecting rod 6
The cover portions 34, 34 ', which are connected to the edges 6b, 6b, extend inward from the upper side of the link plate 4a and maintain the upper surface hermeticity of the link body 2.

On the other hand, at the other end of the upper side connecting rod 6, as shown in FIG. 7 (a), a fitting concave portion 35 for inserting and removing the snap engaging portion 25 projecting inside the upper side of the link plate 4b is formed. A snap hole 37 having a snap claw locking piece 36 is provided in the 35.

As shown in FIG. 7B, the snap locking portion 25 has a snap hole fitting convex portion 39 having a snap claw 38 for locking the snap claw locking piece 36 and the other end of the upper piece coupling rod 6. And a supporting piece 40 for preventing the falling.

Therefore, when the other end of the upper piece connecting rod 6 is pressed against the snap locking portion 25 of the ring plate 4b, the snap hole 37 is opened and the snap claw locking piece 36 is locked by the snap claw 38, and the snap locking is achieved. The part 25 fits into the fitting recess 35, the snap hole fitting projection 39 fits into the snap hole 37, and the other end of the upper side connecting rod 6 and the upper side of the link plate 4b are detachably connected. .

Both ends 7a, 7a of the lower side connecting rod 7 form a T shape as shown in FIG. 3 (e), and snap claws 41, 41 are provided at both ends.
And the lower side fitting portions 24 and 26 projecting inside the lower sides of the link plates 4a and 4b are engaged with the snap claws 41 and 41 as shown in FIG. 4 (a). T-shaped fitting recesses 43, 43 having locking protrusions 42, 42 are provided as recesses.

Therefore, when both ends 7a, 7a of the lower side connecting rod 7 are pushed into the fitting recesses 43, 43 on the lower sides of the link plates 4a, 4b, the snap claws 41, 41 and the locking projections 42, 42 snap-engage. The lower side connecting rod 7 connects the lower sides of the link plates 4a and 4b to each other so that they can be inserted into and removed from each other.

Further, as shown in FIG. 3 (e), an upper slide guide dovetail groove 45 having a large number of conical tip-shaped locking projections 44 is provided on the inner upper surface of the lower side connecting rod 7. On the inner lower surface of 6, a downward slide guide groove 46 is provided to face directly above the slide guide dovetail groove 45, and the partition plate 8 is provided in each of the opposed slide guide groove grooves 45, 46. A pair of lower sliding snap engaging leg pieces 47, 47 formed at the lower end of the partition plate 8 and a pair of upper sliding snap engaging leg pieces 48, 48 formed at the upper end of the partition plate 8 are slidably and loosely fitted. Between the sliding snap engaging leg pieces 47, a short hanging locking piece (not shown) having a tapered lower end is vertically installed, and the locking piece is inserted and removed between the locking projections 44. .

Therefore, when the partition plate 8 is pushed down at a desired position, the hanging locking piece is clamped between the locking projections 44 and the position is fixed, so that the floating movement of the cable or the like housed in the cable drag chain 1 is prevented. It is suppressed by the partition plate 8,
Prevent surface abrasion damage such as cables.

When the partition plate 8 is turned upside down, since there is no hanging locking piece between the upper sliding snap engagement leg pieces 48, 48, the partition plate 8 does not engage with the locking projection 44. , 46
You can slide freely inside.

The cable drag chains of the above-described examples have the cover portions 6 adjacent to each other in order to prevent foreign matters such as dust and oil from entering the cables and damaging the cables when the cables are moved.
It is a closed type cable drag chain in which c, 6c, 7b, 7b are overlapped to hermetically seal the entire cable drag chain.

FIG. 8 shows another embodiment of the upper piece connecting rod 6, which is separably fitted to an upper surface cover member 6'as shown in (a) and an upper piece connecting 6 "as shown in (b). In FIG. 9, the lower piece connecting rod 7 is separably fitted to the lower side connecting rod 7 ″ as shown in (a) and the lower surface cover member 7 ′ as shown in (b). When the upper cover member 6'and the lower cover member 7'are removed, the cable drag chain can be changed from the closed type to the open type.

The cover portions 6c, 7b (see FIG. 3) and the upper and lower cover members 6 ', 7' (see FIGS. 8 and 9) have outer arc surfaces 6d, 7c, 6'd, respectively. 7'c and inner arc surface 6e, 7d, 6 '
e, 7'd are formed.

These outer and inner arc surfaces are always in contact with the cable drag chain in either a straight state or a bent state.
They are formed so as to overlap with each other next to each other and to maintain the sealed state of the cable drag chain.

EFFECTS OF THE INVENTION In the present invention, a large number of link bodies 2 constituting a cable drag chain each have a pair of spaced-apart opposing link plates that are removably coupled to each other, and upper and lower side coupling rods, and each adjacent link. Since the inner end of the plate and the outer end of the connecting recess are formed at the end of the plate, the inner and outer connecting recesses are overlapped with each other. Since it is formed on a flat surface without unevenness, the bending and movement of the cable drag chain can be performed smoothly without any hindrance, and there is no fear of scratching the surface of the stored cables, etc.
The link plates are connected to each other by fitting and inserting a connecting pin integrally formed with the link plate and a pin hole, and the bending regulation and the reversal prevention between the link plates are performed by a boat-shaped stopper integrally formed with the link plate and a stopper receiving recess. The pair of link plates are connected to each other by pivotal contact with each other, and the link plate is integrally formed with the pivot support part, the snap locking part and the upper and lower side fitting parts, and the upper side connecting rod and the lower side connecting rod. Since the rotation shaft portion, the fitting recess and the T-shaped end portions are fitted into each other, the pair of link plates and the upper and lower side joining rods can be assembled and joined to the link body without using a special tool. In addition, since it can be easily disassembled into four pieces, each of the hermetically-sealed cabled devices encloses a cable or the like provided between the fixed end F and the moving end M. It is possible to assemble the Guchen, conventional as, there is no need for housing is inserted from one end closed in sealed drag chain one end of such a cable, with can also be placed against an existing cable or the like,
Even when removing the drag chain from the cable, etc., it can be done by leaving the cable etc. as it is and disassembling each link body, and further, exchanging the link body in the middle part of the cable drag chain Since it is also possible, it is possible to carry out a partial repair and inspection of the cables etc. stored in the drag chain.

Further, the adjacent upper and lower side connecting rods have a cover portion that connects the upper surface and the lower surface between a pair of spaced apart and opposed link plates to each other and covers them without a gap, and the overlapping connection end portions of the adjacent link plates are Since the link body has a cover that protrudes inward, the upper and lower surfaces of the link body are completely sealed, and there is no risk of foreign matter entering, thus preventing damage to cables and the like. When the lower side connecting rod is integrated by fitting the cover member and the connecting member, the lower side connecting rod can be used as an open type cable drag chain as required.

Furthermore, since the link body can be completely disassembled into four pieces, by changing the lengths of the upper and lower side connecting rods, it is possible to expand or contract the optimum cable drag chain according to the increase or decrease in the storage amount of cables and the like. It is possible and the number of link bodies can be easily increased or decreased, so the chain length can be adjusted to an optimum length, and the structure of the link plate and the upper and lower side connecting rods is integrated with resin etc. Since it is configured so that it can be inserted and removed by the shape that can be formed, the effect is remarkable such that the manufacturing is easy and the cost can be reduced.

Further, since the upper side connecting rods that connect the upper sides of the link plates to each other are not only attachable to and detachable from the link plates but also rotatably attached, disconnection accidents that occur in the cable drag chain or internal inspection or cable parts At the time of work such as dynamic repair, the maintenance and inspection of the cables and the like can be easily and quickly performed by removing one end and rotating the entire upper-side connecting rod without removing it.

[Brief description of drawings]

1 to 9 show an embodiment of the present invention, FIG. 1 is a front view showing a bent state of an inner side surface of a link plate of a cable drag chain, and FIG. 2 is an enlarged perspective view of an essential part of the cable drag chain. 3 is an exploded perspective view of the link body,
(A) is an upper side connecting rod, (b) and (c) are a pair of link plates which are separated and opposed to each other, (d) is a partition plate, (e) is a lower side connecting rod, and FIG. 4 (a) is FIG. 3 ( 3B is a front view of the link plate, FIG. 3B is a rear view of the link plate superposed and connected to the link plate of FIG. 3B, and FIG. FIG. 6 is a perspective view showing a fitting / removing structure between the upper side of one of the link plates and one end of the upper side connecting rod. FIG. 6 (a) is a perspective view of a main part of one end of the upper side connecting rod, and FIG. FIG. 7 is a perspective view of a main part of the upper side of the link plate, and FIG. 7 is a perspective view showing a fitting / removing structure of the upper side of the other link plate and the other end of the upper side connecting rod.
FIG. 8A is a perspective view of a main part of the other end of the upper side connecting rod, FIG. 8B is a perspective view of a main part of the other side of the reclining plate, and FIG. 8 is an exploded view of another embodiment of the upper side connecting rod. (A) is a perspective view of the cover member, (b) is a perspective view of the upper side connecting member, FIG. 9 is an exploded view of another embodiment of the lower side connecting rod, and (a) is a lower side connecting rod member. Is a perspective view, and (b) is a cover member. 2 ... Link body, 3 ... Connecting pin 3 '... Pin hole, 4a, 4b ... Link plate 6 ... Upper side connecting rod, 7 ... Lower side connecting rod 6' ... Top cover member (cover), 7 ′ …… Lower surface cover member (cover) 6c, 7b …… Cover part (cover), 8 …… Partition plate 9,10 …… Connecting concave part, 11,11 ′ …… First bending restriction surface 12,12 ′… ... 1st reversal prevention surface 13 ... stopper receiving concave surface (stopper mechanism) 14 ... second bending restriction surface, 15 ... second reversal prevention surface 16 ... fan-shaped notch recess (stopper mechanism), 17 ... Boat-shaped stopper (stopper mechanism) 18 …… Fan-shaped stopper (stopper mechanism), 19,19 ′ …… First bent stopper surface 20,20 ′ …… First reverse stopper surface, 21 …… Second bent stopper surface 22 …… Second reverse stopper surface, 23 …… Upper side pivotal support section (projection piece) 24,26 …… Lower side fitting section, 25 …… Snap locking section 27 …… Rotating shaft section (Second section) Hinge element) 29 ...... Snap engagement protrusion (rotation restricting portion) 30 …… Bearing surface (first hinge element, pivot portion) 31 …… Rotation guide convex surface (first hinge element, elastic piece) 32 ...... Snap engagement concave surface (rotation limiting part) 34,34 …… Cover part (projection piece), 35 …… Fit insertion recess (latch mechanism) 36 …… Snap claw locking piece (latch mechanism) 37 …… Snap Hole (latch mechanism), 38 ...... Snap claw (latch mechanism) 39 …… Snap hole fitting convex part (latch mechanism) 40 …… Bearing piece (latch mechanism)

Claims (6)

[Claims] 1. A cable drag chain for accommodating a cable, a hose or the like, in which a plurality of link bodies each having an upper side and a lower side of a pair of spaced apart and opposed link plates connected to each other by a connecting rod are bendably connected to each other. A pair of link plates are provided with connection recesses that can be fitted into and removed from each other on the inner surface facing one end and the diametrically outer surface on the other end, and an upper side connecting rod that connects the upper sides of the link plates to the link plate. The upper and lower side connecting rods are detachably and rotatably attached, and both ends of the lower side connecting rods that connect the lower sides of the link plates to each other are removably attached to the respective link plates. A cable drag chain that can be opened and closed, which is provided with a cover having arcuate surfaces that overlap each other. 2. The openable and closable cable drag chain according to claim 1, wherein the respective covers of the upper and lower side connecting rods are detachable. 3. A cable drag chain for accommodating a cable, a hose, etc., in which a plurality of link bodies, each having an upper side and a lower side of a pair of spaced apart and opposed link plates connected to each other by a connecting rod, are bendably connected to each other. A pair of link plates are provided with connection recesses that can be fitted into and removed from each other on one end facing inner surface and the other end diametrically outer surface, and one end of an upper side connecting rod that connects the upper sides of the link plates to each other. Of the lower side linking rod which is removably and rotatably mounted on the link plate, and the other end of the upper side coupling rod is removably mounted on the other link plate, and the lower sides of the link plates are coupled to each other. End portions of the pair of link plates are removably attached to the respective link plates, and opposite side surfaces of the pair of link plates and the other end portions of the pair of link plates adjacent to the link plates. A stopper mechanism is provided between the side surface and the side surface that is symmetrical about the center of rotation of the link plate and has a contact surface and an abutted surface, and restricts mutual rotation. First and second hinge elements that are complementary to each other are provided between the protruding side formed and the one end of the upper side connecting rod, and a latch mechanism is provided between the other end of the upper side connecting rod and the upper side of the other link plate. A cable drag chain that can be opened and closed. 4. The second piece from the first hinge element, wherein the projecting piece includes a pivot portion for pivotally attaching the upper side connecting rod and a rotation limiting portion for limiting a rotation angle. The cable drag chain according to claim 3, which is adapted to prevent the elements from coming off. 5. The openable / closable cable drag chain according to claim 4, wherein the projecting piece is composed of three parts spaced apart along the link plate. 6. An elastic piece for restricting a turning angle of the upper side connecting rod to prevent the first and second hinge elements from being separated from each other, the both ends of the three parts forming the pivotally connecting part, and the central part of the elastic part. Is,
A cable drag chain according to claim 5, which can be opened and closed.