Outer tube mounting jig and outer tube mounting method

Abstract

To provide a mounting jig for an exterior tube capable of smoothly mounting the exterior tube to an electric wire in a short time.SOLUTION: A jig for mounting an exterior tube C to the outer periphery of an electric wire while opening a slit is composed of a body 10 and a cover 20. The body has a trough-shaped bottom plate 11 and a pair of triangular side plates 12 rising from both left and right side edges of the bottom plate. An inclined upper edge 12a of the side plate is inserted into the exterior tube from the slit and serves as a guide for sliding the exterior tube while opening the slit. The cover 20 is fixed on the body so as to surround the outside of the body, and secures a slide passage of the exterior tube between itself and the upper edge 12a of the side plate to restrict upward separation of the exterior tube C.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an attachment jig for attaching an armor tube, such as a corrugated tube, to an electric wire, and a method for attaching the armor tube. [Background technology]

[0002] In a wire harness installed in a vehicle, an outer tube such as a corrugated tube is attached to the outer periphery of the electric wire at a necessary location for protecting the electric wire. For example, a corrugated tube is an outer tube made of resin having a bellows shape and is flexible.

[0003] As shown in Figure 9(a), this type of corrugated tube C has a continuous slit K in the longitudinal direction at one circumferential location on the peripheral wall, and by opening this slit K, it can be attached to the outer periphery of an electric wire from the side. In the corrugated tube C shown in Figure 9(a), both side edges of the slit K do not overlap, but there is also a corrugated tube C as shown in Figure 9(b) in which both side edges of the slit K overlap. When attaching either type of corrugated tube C to an electric wire, the slit K is opened from the side of the electric wire and the tube is attached to the outer periphery of the electric wire.

[0004] In order to facilitate the attachment of this type of corrugated tube to an electric wire, an attachment jig is used as shown in Patent Document 1. Figures 10(a) to 10(g) show the procedure for attaching a corrugated tube C to an electric wire W using the attachment jig described in Patent Document 1.

[0005] As shown in Figure 10(a), this mounting jig 110 has a gutter-shaped bottom plate 111 and a pair of triangular side plates 112 rising from both the left and right edges of the gutter-shaped bottom plate 111, and is integrally molded from resin.

[0006] The upper edges 112a of the pair of side plates 112 are elastically deformable in directions that move them closer to and away from each other, and the upper edges 112a are inclined downward from the rear end to the front end. These upper edges 112a are inserted into the corrugated tube C through the slits K in the corrugated tube C, and function as guides when the corrugated tube C is slid from the rear end to the front end while opening the slits K.

[0007] In addition, the inclined upper edges 112a of the pair of side plates 112 are provided with outward flanges 113 that engage with the edges of the slits K when the upper edges 112a are inserted into the corrugated tube C through the slits K in the corrugated tube C, thereby preventing the corrugated tube C from falling out upward.

[0008] To mount the corrugated tube C around the outer periphery of the electric wire W using this mounting jig 110, first, the electric wire W is inserted onto the bottom plate 111 of the mounting jig 110 as shown in FIG. 10(a).

[0009] 10(b) and 10(c), the upper edges 112a of the pair of side plates 112 of the installation jig 110 are pressed together so that they approach each other. Then, the front end of the corrugated tube C is slid from the rear toward the rear ends of the upper edges 112a of the pair of side plates 112 so that the upper edges 112a are inserted into the corrugated tube C from the front end of the slit K of the corrugated tube C (a pushing operation in the direction of arrow Y).

[0010] Next, as shown in Fig. 10(d), the upper edges 112a of the pair of side plates 112 are opened by the elastic restoring force of the side plates 112, thereby opening the slit K in the corrugated tube C, and the corrugated tube is slid forward (in the direction of arrow Y) as shown in Fig. 10(e) using the upper edges 112a, which are inclined downward toward the front, as a guide. Then, as shown in Fig. 10(f), with the slit K opened, the front end of the corrugated tube C is attached from above (to the side of the electric wire W) to the outer periphery of the electric wire W arranged on the bottom plate 111.

[0011] Then, by gradually pushing the corrugated tube C forward as indicated by the arrow Y, the corrugated tube C is attached while sliding forward on the outer periphery of the electric wire W. Then, as shown in FIG. 10(g), when the corrugated tube C has been attached to the outer periphery of the electric wire W up to its end, the attachment jig 110 is removed from the electric wire W, thereby completing the attachment of the corrugated tube C to the outer periphery of the electric wire W.

[0012] In this case, one work stroke corresponds to the operation of the worker grasping the corrugated tube C with his / her hand and pushing it forward along the upper edge 112a of the side plate 112 by the length of the upper edge 112a. Therefore, by repeating this work stroke operation, the worker can attach the corrugated tube C to the outer periphery of the electric wire W over the entire length. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-39695 Summary of the Invention [Problem to be solved by the invention]

[0014] As described above, when using the conventional installation jig 110, it was necessary to feed the corrugated tube C forward while sliding it over the outer periphery of the electric wire W. Therefore, as the length of the corrugated tube C increased, the frictional resistance between the corrugated tube C and the electric wire W increased, making the installation difficult. Furthermore, if the outer periphery of the electric wire W was uneven, the tip of the corrugated tube C could get caught on the unevenness and be unable to advance any further. Furthermore, since one operation stroke was short, equivalent to the length of the upper edge 112a of the installation jig 110, the installation took a long time.

[0015] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an armor tube mounting jig and an armor tube mounting method that can smoothly and stably mount an armor tube around the outer periphery of an electric wire and that can shorten the working time by lengthening one working stroke. [Means for solving the problem]

[0016] In order to achieve the above-mentioned object, the mounting jig for an armor tube and the mounting method for an armor tube according to the present invention are characterized by the following (1) to (6). (1) An armor tube mounting jig for mounting an armor tube having a continuous longitudinal slit at one circumferential location on the outer periphery of an electric wire, a main body having a trough-shaped bottom plate that forms a passage for inserting electric wires, and a pair of side plates that rise from both left and right side edges of the trough-shaped bottom plate, with upper edges that are elastically deformable in directions approaching and separating from each other, and the upper edges that slope downward from the rear end to the front end serve as guides that slide the armor tube from the rear end to the front end when the armor tube is inserted into the armor tube through the slit; a cylindrical cover that is attached to the main body so as to surround the outside thereof and is fixed to the main body, thereby ensuring a slide passage for the outer tube between itself and the upper edges of the pair of side plates and restricting upward separation of the outer tube that slides along the upper edges of the pair of side plates using the upper edges as guides; Equipped with An outer tube mounting jig characterized by the above.

[0017] (2) The upper edges of the pair of side plates are provided with flanges that engage with the edges of the slits when the upper edges are inserted into the outer tube through the slits in the outer tube, thereby preventing the outer tube from falling off upward. The mounting jig for an exterior tube according to (1) above.

[0018] (3) The cylindrical cover has a pair of side walls located outside the side plates of the main body, a diagonal groove-shaped opening is formed in one of the pair of side walls along the inclined upper edge of the side plate of the main body, The height of the side plate of the main body is set so that at least a part of the upper edge of the side plate is located above the upper edge of the opening. The mounting jig for an exterior tube according to (1) or (2) above,

[0019] (4) Of the pair of side walls of the cover, the side wall opposite to the side wall having the opening and one side plate of the main body facing the side wall are connected to each other by a connecting means. The mounting jig for an exterior tube according to (3) above.

[0020] (5) The upper wall of the cover is inclined upward toward the rear, and a protrusion is provided at the rear end of the upper wall. The mounting jig for an exterior tube according to any one of (1) to (4) above.

[0021] (6) A method for attaching an armoring tube to an outer periphery of an electric wire using the armoring tube attachment jig according to any one of (1) to (5), comprising the steps of: a step of inserting the electric wire into an electric wire insertion passage formed in an upper surface portion of a bottom plate of a main body of the installation jig; a step of squeezing upper edges of a pair of side plates of a main body of the installation jig so that they approach each other, and sliding a front end of the outer tube toward a rear end of the upper edges so that the upper edges are inserted into the outer tube from the front end of the slit in the outer tube; a step of opening the slit in the armor tube by opening the upper edges of the pair of side plates by an elastic restoring force, and sliding the armor tube forward using the upper edges inclined downward toward the front as a guide, thereby attaching the front end of the armor tube to the outer periphery of the electric wire; a step of gripping and fixing a front end of the armor tube attached to the outer periphery of the electric wire so as to press the front end against the electric wire, and sliding the attachment jig rearward along the electric wire from that position, thereby attaching the armor tube to the electric wire as the attachment jig moves rearward while sliding the armor tube relatively forward inside the attachment jig; a step of removing the attachment jig from the electric wire when the outer tube is attached to the electric wire up to its end by repeating the step of attaching the outer tube to the electric wire; A method for attaching an exterior tube, comprising:

[0022] According to the mounting jig having the configuration (1) above, when the grippable length of the front end of the outer casing tube has been mounted around the outer periphery of the electric wire, the portion of the outer casing tube that has already been mounted around the electric wire is gripped and fixed so as to press it against the electric wire, and from that gripped and fixed position, the mounting jig is slid rearward along the electric wire, thereby making it possible to mount the outer casing tube around the outer periphery of the electric wire. As a result, by pulling the attachment jig backward, the armor tube inserted in the attachment jig can be attached smoothly and stably to the outer periphery of the electric wire. Therefore, unlike when the armor tube is pushed toward the front end of the electric wire as in the case of using a conventional attachment jig, there is no risk of the armor tube getting caught on the electric wire midway, and there is no risk of damaging the electric wire, and the armor tube can be attached smoothly to the outer periphery of the electric wire. Furthermore, each working stroke can be longer than when the armor tube is pushed forward as in the conventional case, which shortens the working time.

[0023] According to the installation jig having the configuration (2) above, the outward flange provided on the upper edge of the side plate of the main body can more firmly prevent the armor tube from falling off upward. Also, because the force preventing the armor tube from falling off upward can be exerted by the means on the main body side (the outward flange), the resistance when the armor tube slides along the inner wall of the cover can be weakened, allowing the sliding to occur smoothly. This contributes to reducing the operating force required to slide the installation jig rearward.

[0024] With the mounting jig configured as described above in (3), the upper edges of the side plates of the main body housed inside can be pressed through the oblique openings in the side walls of the cover, thereby easily tightening the upper edges of the side plates of the main body while the cover is surrounding the main body. In addition, since at least a portion of the upper edges of the side plates of the main body are positioned above the upper edge of the opening, the upper edges of the side plates of the main body can be prevented from protruding outside the opening in the cover.

[0025] According to the mounting jig having the configuration (4) above, only one side plate of the main body is fixed to the cover, so that the elastic deformation of the other side plate is not hindered, and the upper edges of both side plates can be smoothly inserted into the slit in the outer tube while being pinched.

[0026] According to the mounting jig having the configuration (5) above, the upper wall of the cover is inclined upward toward the rear, and a protrusion is provided at the rear end of the upper wall of the cover. Therefore, when sliding the mounting jig rearward, the rearward force from the operator's hand gripping the cover can be fully absorbed by the inclined upper wall and the protrusion, and this force can be effectively used as an operating force to slide the mounting jig rearward.

[0027] According to the attachment method having the configuration (6) above, by pulling and moving the attachment jig backward, the armor tube inserted into the attachment jig can be smoothly attached to the outer periphery of the electric wire. Therefore, unlike when the armor tube is pushed toward the front end side of the electric wire as in the case of using a conventional attachment jig, there is no risk of the armor tube getting caught on the electric wire midway, and the armor tube can be smoothly and stably attached to the outer periphery of the electric wire. Furthermore, each working stroke (i.e., the working stroke of gripping and fixing the part of the armor tube that has already been attached to the electric wire so as to press it against the electric wire, and sliding the attachment jig backward along the electric wire from that gripping and fixing position) can be made longer than in the case of pushing it forward as in the conventional case, thereby shortening the working time. [Effects of the Invention]

[0028] According to the present invention, by pulling the installation jig backward, the armoring tube inserted in the installation jig can be smoothly and stably installed around the outer periphery of the electric wire. In addition, each working stroke can be made longer than in the conventional case where the installation jig is pushed forward, thereby shortening the work time.

[0029] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a side view of a mounting jig for a corrugated tube according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the mounting jig for the corrugated tube. [Figure 3] FIG. 3 is a perspective view of the corrugated tube mounting jig as seen from behind, and FIG. 3(a) and FIG. 3(b) are perspective views as seen from different directions. [Figure 4] 4A and 4B are diagrams showing the state at the stage when the corrugated tube begins to be inserted into the corrugated tube mounting jig, with FIG. 4A being a side view and FIG. 4B being a view seen from behind. [Figure 5] FIG. 5 is a side view showing a state in which the front end of the corrugated tube inserted into the corrugated tube mounting jig has started to be mounted around the outer periphery of the electric wire. [Figure 6] 6(a) to 6(d) are diagrams for explaining the procedure for attaching a corrugated tube to the outer periphery of an electric wire using a corrugated tube attachment jig. [Figure 7] 7(e) to (h) are diagrams for explaining the steps following those in FIG. 6(a) to (d). [Figure 8] 8(i) to 8(l) are diagrams for explaining the steps following those in FIG. 7(e) to 7(h). [Figure 9]9A and 9B are diagrams showing examples of corrugated tubes, in which FIG. 9A shows an example in which the edges of the cuts do not overlap, and FIG. 9B shows an example in which they overlap. [Figure 10] 10(a) to 10(g) are diagrams for explaining the procedure for attaching a corrugated tube to the outer periphery of an electric wire using a conventional attachment jig. [Figure 11] FIG. 11 is a diagram for explaining a problem that is expected to occur when a corrugated tube is attached to an electric wire using a conventional attachment jig. DETAILED DESCRIPTION OF THE INVENTION

[0031] Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0032] Fig. 1 is a side view of a corrugated tube installation jig according to an embodiment. Fig. 2 is an exploded perspective view of the corrugated tube installation jig. Fig. 3 is a perspective view of the corrugated tube installation jig as seen from the rear, and Fig. 3(a) and Fig. 3(b) are views as seen from different directions.

[0033] In this embodiment, a corrugated tube is used as an example of an exterior tube to be fitted around the outer periphery of the electric wire W. The corrugated tube C has a continuous slit K in the longitudinal direction at one location in the circumferential direction, similar to that shown in Fig. 9 , and is fitted around the outer periphery of the electric wire W while opening the slit K. The fitting jig 1 of the embodiment shown in Figs. 1 to 3 is for fitting such a corrugated tube C around the outer periphery of the electric wire W.

[0034] The installation jig 1 of this embodiment includes a body 10 and a cover 20, each of which is molded separately from another body 10 made of resin. The body 10 has a trough-shaped bottom plate 11 on the top surface of which an electric wire insertion passage 18 is formed, and a pair of triangular side plates 12 rising from both left and right edges of the trough-shaped bottom plate 11.

[0035] The upper edges 12a of the pair of side plates 12 are elastically deformable in directions that move them closer to and away from each other. The upper edges 12a, which correspond to the hypotenuses of the triangular side plates 12, slope downward from the rear end to the front end. Here, the symbol A in the figure indicates the rear side of the installation jig 1, and the symbol B in the figure indicates the front side of the installation jig 1. The upper edges 12a of the pair of side plates 12 are inserted into the corrugated tube C through the slit K, and serve as guides when the corrugated tube C is slid from the rear end to the front end while opening the slit K.

[0036] Furthermore, small outward flanges 13 are provided along the extending direction of the upper edges 12a on the inclined upper edges 12a of the pair of side plates 12. When the upper edges 12a are inserted into the corrugated tube C through the slits K in the corrugated tube C, these outward flanges 13 engage with the edges of the slits K, thereby preventing the corrugated tube C from falling out upward.

[0037] The cover 20 is formed in a cylindrical shape that penetrates in the front-to-rear direction so as to surround the outside of the main body 10, and has a bottom wall 21 that covers the bottom plate 11 of the main body 10, side walls 22 that cover the side plates 12 of the main body 10, and a top wall 24 that covers the upper part of the main body 10. The bottom wall 21, side walls 22, and top wall 24 are formed to be continuous with smoothly curved surfaces, and the size and smoothness of the outer surface are set so that the worker can hold it with one hand. A passage 28 with a U-shaped cross section is provided above the bottom wall 21, on which the bottom plate 11 of the main body 10 rests.

[0038] The cover 20 is attached to the main body 10 so as to cover the outside of the main body 10 and is fixed to the main body 10, thereby ensuring a slide path 29 for the corrugated tube C between the upper edges 12a of the pair of side plates 12. Furthermore, by covering the upper part of the main body 10 while ensuring the slide path 29, the cover 20 is adapted to restrict upward removal of the corrugated tube C that slides along the upper edges 12a of the pair of side plates 12, using the upper edges 12a as a guide.

[0039] One of the pair of side walls 22 of the cylindrical cover 20 has a diagonal groove-shaped opening 23 formed along the slanted upper edge 12a of the side plate 12 of the main body 10. This opening 23 is provided mainly so that an operator can press with their finger from outside near the upper end of one of the side plates 12 of the main body 10 housed inside the cover 20, and the lower edge 23a and upper edge 23b of the opening 23 are parallel. The inclination of the opening 23 and the inclination of the upper edge 12a of the side plate 12 of the main body 10 are slightly different, and the inclination and height of the side plate 12 are set so that the rear end of the upper edge 12a of the side plate 12 of the main body 10 is located above the upper edge 23b of the opening 23.

[0040] As shown in Fig. 3, the main body 10 and the cover 20 are fixed together by connecting the lower part of the side wall 22 opposite the side wall 22 having the opening 23 to the lower part of one of the side plates 12 of the main body 10 facing the side wall 22 with connecting means 26 such as screws. In the fixed state, as shown in Fig. 1, the front ends of the bottom plate 11 and side plates 12 of the main body 10 protrude forward beyond the front end of the cover 20. Furthermore, the rear ends of the bottom plate 11 and side plates 12 of the main body 10 protrude slightly rearward beyond the rear end of the cover 20. Furthermore, the bottom plate 11 of the main body 10 is placed on top of the bottom wall 21 of the cover 20, and the side wall 22 of the cover 20 is positioned outside the side plate 12 of the main body 10.

[0041] 1, the upper wall 24 of the cover 20 is inclined upward toward the rear, and a protrusion 25 is provided at the rear end of the inclined upper wall 24. This protrusion 25 is provided so that when an operator applies a force to the cover 20 in a rearward direction with his or her hand, the force can be efficiently received.

[0042] Next, a procedure for attaching the corrugated tube C to the outer periphery of the electric wire W using the attachment jig 1 having the above configuration will be described with reference to FIGS.

[0043] Fig. 4 shows the state at the stage when the corrugated tube C begins to be inserted into the installation jig 1, Fig. 4(a) being a side view and Fig. 4(b) being a view from behind. Fig. 5 is a side view showing the state at the stage when the front end of the corrugated tube C inserted into the installation jig 1 begins to be installed around the outer periphery of the electric wire W. Figs. 6 to 8(a) to (h) are views for explaining the procedure for installing the corrugated tube C around the outer periphery of the electric wire W using the installation jig 1.

[0044] The corrugated tube C can be attached to the outer periphery of the electric wire W in the following manner. That is, first, as shown in FIGS. 6(a) and 6(b), the electric wire W is inserted into the electric wire insertion passage 18 formed in the upper surface of the bottom plate 11 of the main body 10 of the installation jig 1.

[0045] The method of insertion can be a method of passing the front end of the electric wire W from the rear of the mounting jig 1. However, if the terminal Wt attached to the tip of the electric wire W is large and it is difficult to pass the electric wire W through, the electric wire W may be inserted into the mounting jig 1 through an oblique opening 23 provided in one side wall 22 of the cover 20.

[0046] After the electric wire W is threaded through, as shown in FIGS. 4(a), 4(b), and 6(b), the upper edges 12a of the pair of side plates 12 of the main body 10 of the installation jig 1 are narrowed toward each other. Then, while narrowing the upper edges 12a, the front end of the corrugated tube C is slid toward the rear end of the upper edges 12a so that the upper edges 12a are inserted into the corrugated tube C from the front end of the slit K in the corrugated tube C. In other words, the corrugated tube C is pushed forward in the direction of arrow Y in FIG. 6(c). To narrow the upper edges 12a of the side plates 12, an operator can narrow the upper edges 12a of the pair of side plates 12 toward each other while pushing one of the side plates 12 with his or her fingers through the opening 23 of the cover 20.

[0047] Next, the pinching operation of the upper edges 12a by the fingers is released, and the upper edges 12a of the pair of side plates 12 are opened by the elastic restoring force of the side plates 12. As a result, the slit K in the corrugated tube C is opened, and the corrugated tube C is slid forward using the upper edges 12a, which are inclined downward toward the front, as a guide, until the front end of the corrugated tube C is attached to the outer periphery of the electric wire W, as shown in Figure 6(d). Figure 5 shows this state.

[0048] Next, as shown in Figures 7(e) and (f), when the grippable length of the front end of the corrugated tube C, i.e., a length that can be held in one hand, has been attached to the outer periphery of the electric wire W, the part of the corrugated tube C that has already been attached to the electric wire W (the part that is being held by the worker's left hand in Figure 7(f)) is gripped and fixed so as to press it against the electric wire W. The gripping and fixing position at this time is designated as P1.

[0049] Next, from the gripping and fixing position P1, the attachment jig 1 is slid backward along the electric wire W as shown by the arrow X in Fig. 7(f). By this operation, the corrugated tube C is slid relatively forward inside the attachment jig 1, and as shown in Fig. 7(g), the corrugated tube C is attached to the outer periphery of the electric wire W as the attachment jig 1 moves backward.

[0050] With one working stroke (the stroke of moving the mounting jig 1 backward from the fixed gripping position), the corrugated tube C can be attached to the outer circumference of the wire W within the length range from the fixed gripping position to the sliding position of the mounting jig 1 (approximately the length of the worker's arms slightly apart).

[0051] As shown in Fig. 7(g), after the installation jig 1 is pulled backward to a distance that does not place a great burden on the worker, this is considered one work stroke, and the gripping and fixing position is moved closer (rearward) to the installation jig 1 to operate the next work stroke. That is, the gripping and fixing position is changed from position P1 shown in Fig. 7(g) to position P2 shown in Fig. 7(h). Then, as shown in Fig. 8(i), the installation jig 1 is pulled backward a distance that does not place a great burden on the worker, thereby installing the corrugated tube C around the outer periphery of the electric wire W.

[0052] By repeating this operation, when the final work stroke is reached, the gripping and fixing position is set to the final position PN as shown in Figures 8(j) and (k), and the mounting jig 1 is pulled backward. Then, as shown in Figure 8(l), the corrugated tube C comes out of the mounting jig 1, and the corrugated tube C is mounted on the outer periphery of the electric wire W up to its end.

[0053] In this way, once the corrugated tube C has been attached to the electric wire W up to its end, the attachment jig 1 is removed from the electric wire W, thereby completing the attachment work of the corrugated tube C.

[0054] As explained above, by repeating this operation of working strokes while changing the gripping and fixing position P (P1, P2, PN) for each working stroke (while changing the gripping and fixing point), the corrugated tube C can be attached to the outer circumference of the electric wire W up to the end of the corrugated tube C.

[0055] During the above operation, as the installation jig 1 moves backward along the wire W, the corrugated tube C slides relatively forward inside the installation jig 1, and a force acts on the sliding corrugated tube C in a direction that causes it to separate from the upper edges 12a of the pair of side plates 12. However, because the upper side of the corrugated tube C is covered by the upper wall 24 of the cover 20, the force in the separation direction is suppressed by the cover 20, and the corrugated tube C does not fall off the upper edges 12a of the pair of side plates 12. Furthermore, unlike when the corrugated tube C is pressed down by hand, the corrugated tube C slides smoothly along the inner surface of the cover 20, and therefore, there is no hindrance to feeding out the corrugated tube C.

[0056] As a comparative example, the case where the mounting jig 110 without a cover shown in FIG. 10 is slid backward (in the direction of arrow X) from the gripping and fixing position P in the same manner as the mounting jig 1 of this embodiment will be explained using FIG. 11.

[0057] In theory, it is thought that the corrugated tube C is fed along the upper edge 112a of the side plate 112 of the mounting jig 110 due to the guiding action of the upper edge 112a, and is mounted on the outer periphery of the electric wire W.

[0058] However, in reality, as the installation jig 110 is moved rearward along the electric wire W, a force S acts on the corrugated tube C, which is guided by the upper edge 112a of the side plate 112, in a direction that causes the corrugated tube C to separate from the upper edge 112a of the side plate 112. For this reason, an operator must manually press the corrugated tube C in the direction of arrow T toward the upper edge 112a of the side plate 112 to prevent the corrugated tube C from separating.

[0059] However, the corrugated tube C must also slide smoothly between the palm of the worker trying to press it and the upper edge 112a of the side plate 112. This requires the worker to perform a difficult operation in which the worker must press the corrugated tube C with the palm of his / her hand while at the same time accepting the smooth sliding of the corrugated tube C with the inside of his / her hand. For this reason, in reality, it is difficult to perform the operation of moving the installation jig 110 backward.

[0060] As described above, by pulling the installation jig 1 backward, the corrugated tube C inserted into the installation jig 1 can be smoothly and stably installed around the outer periphery of the electric wire W. Therefore, unlike when the corrugated tube C is pushed toward the front end of the electric wire as in the case of using the conventional installation jig 1, there is no risk of the corrugated tube C getting caught on the electric wire along the way, and there is absolutely no risk of damaging the electric wire W, and the corrugated tube C can be smoothly installed around the outer periphery of the electric wire W. Furthermore, each working stroke (i.e., the working stroke of gripping and fixing the part of the corrugated tube C that has already been installed on the electric wire W so as to press it against the electric wire W, and sliding the installation jig 1 backward along the electric wire W from the gripping and fixing position P) can be made longer than in the case of pushing it forward as in the conventional case, thereby shortening the working time.

[0061] Furthermore, according to this embodiment, the following advantageous effects can be obtained. That is, first, the outward flange 13 provided on the upper edge 12a of the side plate 12 of the main body 10 can more firmly prevent the corrugated tube C from falling off upward. Also, because the force preventing the corrugated tube C from falling off upward can be exerted by the means on the main body 10 side (the outward flange 13), the resistance when the corrugated tube C slides along the inner wall of the cover 20 can be weakened, allowing the sliding to occur smoothly. This can therefore contribute to reducing the operating force required when sliding the installation jig 1 rearward.

[0062] Furthermore, the vicinity of the upper edge 12a of the side plate 12 of the main body 10 housed inside can be pressed through the oblique opening 23 provided in the side wall 22 of the cover 20, thereby making it possible to easily tighten the upper edge 12a of the side plate 12 of the main body 10 while the main body 10 is surrounded by the cover 20. Furthermore, since at least a part of the upper edge 12a of the side plate 12 of the main body 10 is positioned above the upper edge 23b of the opening 23, the upper edge 12a of the side plate 12 of the main body 10 can be prevented from protruding out of the opening 23 of the cover 20.

[0063] Furthermore, the fixing of the main body 10 and the cover 20 is achieved by simply fixing the lower portion of one of the side plates 12 of the main body 10 to the lower portion of the side wall 22 of the cover 20, and therefore does not hinder the elastic deformation of the other side plate 12. Furthermore, since the vicinity of the upper edge 12a of one of the side plates 12 is not constrained, the upper edges 12a of both side plates 12 can be smoothly inserted into the slits K of the corrugated tube C while they are pinched together.

[0064] Furthermore, according to the mounting jig 1 of this embodiment, the upper wall 24 of the cover 20 is inclined upward toward the rear, and a protrusion 25 is provided at the rear end of the upper wall 24 of the cover 20. Therefore, when sliding the mounting jig 1 rearward, the rearward force from the worker's hand gripping the cover 20 can be fully absorbed by the inclined upper wall 24 and the protrusion 25, and this force can be used effectively as an operating force to slide the mounting jig 1 rearward.

[0065] In the above embodiment, a corrugated tube is given as an example of an exterior tube, but it is not limited to a corrugated tube as long as it is an exterior tube that is fitted around the outer periphery of an electric wire.

[0066] Here, the features of the mounting jig and mounting method for the armor tube according to the embodiment of the present invention described above will be briefly summarized and listed below in [1] to [6]. [1] An installation jig (1) for an armor tube (C) for installing an armor tube (C) having a longitudinally continuous slit (K) at one location in the circumferential direction around an electric wire (W), a main body (10) having a trough-shaped bottom plate (11) forming an insertion passage (18) for an electric wire (W); and a pair of side plates (12) rising from both left and right side edges of the trough-shaped bottom plate (11), with upper edges (12a) elastically deformable in directions approaching and separating from each other, the upper edges (12a) sloping downward from the rear end to the front end serving as guides for sliding the armor tube (C) from the rear end to the front end when the armor tube (C) is inserted into the armor tube (C) through the slit (K); a cylindrical cover (20) that is attached to the main body (10) so as to surround the outside thereof and is fixed to the main body (10), thereby ensuring a slide path (29) for the outer tube (C) between itself and the upper edges (12a) of the pair of side plates (12) and restricting upward separation of the outer tube (C) that slides along the upper edges (12a) of the pair of side plates (12) using the upper edges (12a) as guides; Equipped with An installation jig (1) for an outer tube (C).

[0067] [2] The upper edges (12a) of the pair of side plates (12) are provided with flanges (13) that engage with the edges of the slits (K) of the outer tube (C) when the upper edges (12a) are inserted into the outer tube (C) through the slits (K) of the outer tube (C), thereby preventing the outer tube (C) from falling off upward. The mounting jig (1) for the exterior tube (C) according to the above [1].

[0068] [3] The cylindrical cover (20) has a pair of side walls (22) located outside the side plates (12) of the main body (10), An oblique groove-shaped opening (23) is formed in one of the pair of side walls (22) along the inclined upper edge (12a) of the side plate (12) of the main body (10), The height of the side plate (12) of the main body (10) is set so that at least a part of the upper edge (12a) of the side plate (12) is located above the upper edge (23b) of the opening (23). The mounting jig (1) for the exterior tube (C) according to the above [1] or [2].

[0069] [4] Of the pair of side walls (22) of the cover (20), the side wall (22) opposite to the side wall (22) having the opening (23) is connected to one side plate (12) of the main body (10) facing the side wall (22) by a connecting means (26). The mounting jig (1) for the exterior tube (C) according to the above [3].

[0070] [5] The upper wall (24) of the cover (20) is inclined upward toward the rear, and a protrusion (25) is provided at the rear end of the upper wall (24). The mounting jig (1) for the exterior tube (C) according to any one of the above items [1] to [4].

[0071] [6] A method for attaching an armor tube (C) to an outer periphery of the electric wire (W) using the attachment jig (1) for the armor tube (C) according to any one of the above [1] to [5], a step of inserting the electric wire (W) into an electric wire insertion passage (18) formed on an upper surface of a bottom plate (11) of a main body (10) of the installation jig (1); a step of squeezing upper edges (12a) of a pair of side plates (12) of a main body (10) of the installation jig (1) so that they approach each other, and sliding the front end of the outer tube (C) to the rear end of the upper edges (12a) so that the upper edges (12a) are inserted into the outer tube (C) from the front end of the slit (K) of the outer tube (C); a step of opening the slit (K) of the armor tube (C) by opening the upper edges (12a) of the pair of side plates (12) by elastic restoring force, sliding the armor tube (C) forward using the upper edges (12a) inclined downward toward the front as a guide, and attaching the front end of the armor tube (C) to the outer periphery of the electric wire (W) arranged on the bottom plate (11); a step of gripping and fixing the front end of the outer tube (C) attached to the outer periphery of the electric wire (W) so as to press it against the electric wire (W), and sliding the attachment jig (1) rearward along the electric wire (W) from that position (P, P1, P2, PN), thereby attaching the outer tube (C) to the electric wire (W) as the attachment jig (1) moves rearward while sliding the outer tube (C) relatively forward inside the attachment jig (1); a step of removing the attachment jig (1) from the electric wire (W) when the outer tube (C) is attached to the electric wire (W) up to its end by repeating the step of attaching the outer tube (C) to the electric wire (W); A method for attaching an exterior tube (C), comprising the steps of: [Explanation of symbols]

[0072] 1 Mounting jig 10 Main Unit 11 Bottom plate 12 Side panel 12a Upper edge 13 Flange 18 Electrical wire passage 20 Cover 21 Bottom wall 22 Side wall 23 Aperture 23b Upper edge of opening 24 Upper Wall 25 protrusion 26 Connection means 29 Slideway C Corrugated tube (exterior tube) K break P,P1,P2,PN Gripping fixed position W electric wire

Claims

1. An armor tube mounting jig for mounting an armor tube having a continuous longitudinal slit at one circumferential location on an outer periphery of an electric wire, a main body having a trough-shaped bottom plate that forms a passage for inserting electric wires, and a pair of side plates that rise from both left and right side edges of the trough-shaped bottom plate, with upper edges that are elastically deformable in directions approaching and separating from each other, and the upper edges that slope downward from the rear end to the front end serve as guides that slide the armor tube from the rear end to the front end when the armor tube is inserted into the armor tube through the slit; a cylindrical cover that is attached to the main body so as to surround the outside thereof and is fixed to the main body, thereby ensuring a slide passage for the outer tube between itself and the upper edges of the pair of side plates and restricting upward separation of the outer tube that slides along the upper edges of the pair of side plates using the upper edges as guides; Equipped with An outer tube mounting jig characterized by the above.

2. The upper edges of the pair of side plates are provided with flanges that engage with the edges of the slits when the upper edges are inserted into the outer tube through the slits in the outer tube, thereby preventing the outer tube from falling off upward.

2. The mounting jig for an exterior tube according to claim 1.

3. the cylindrical cover has a pair of side walls positioned outside the side plates of the main body, a diagonal groove-shaped opening is formed in one of the pair of side walls along the inclined upper edge of the side plate of the main body, The height of the side plate of the main body is set so that at least a part of the upper edge of the side plate is located above the upper edge of the opening.

3. The mounting jig for an exterior tube according to claim 1 or 2.

4. The side wall of the pair of side walls of the cover opposite to the side wall having the opening and one side plate of the main body facing the side wall are connected to each other by a connecting means.

4. The mounting jig for an exterior tube according to claim 3.

5. The upper wall of the cover is inclined upward toward the rear, and a protrusion is provided at the rear end of the upper wall.

5. The mounting jig for an exterior tube according to claim 1.

6. A method for attaching an armoring tube to an outer periphery of an electric wire using the armoring tube attachment jig according to any one of claims 1 to 5, comprising: a step of inserting the electric wire into an electric wire insertion passage formed in an upper surface portion of a bottom plate of a main body of the installation jig; a step of squeezing upper edges of a pair of side plates of a main body of the installation jig so that they approach each other, and sliding a front end of the outer tube toward a rear end of the upper edges so that the upper edges are inserted into the outer tube from the front end of the slit in the outer tube; a step of opening the slit in the armor tube by opening the upper edges of the pair of side plates by an elastic restoring force, and sliding the armor tube forward using the upper edges inclined downward toward the front as a guide, thereby attaching the front end of the armor tube to the outer periphery of the electric wire; a step of gripping and fixing a front end of the armor tube attached to the outer periphery of the electric wire so as to press the front end against the electric wire, and sliding the attachment jig rearward along the electric wire from that position, thereby attaching the armor tube to the electric wire as the attachment jig moves rearward while sliding the armor tube relatively forward inside the attachment jig; a step of removing the attachment jig from the electric wire when the outer tube is attached to the electric wire up to its end by repeating the step of attaching the outer tube to the electric wire; A method for attaching an exterior tube, comprising:

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