Insulating cap and jig for attaching insulating cap

Abstract

To reduce the operation burden in attaching a connection terminal to an electric wire or cable.SOLUTION: In order to reduce the operation burden in attaching a connection terminal 3 to an electric wire or cable 2, an insulating cap 4 is provided. The insulating cap 4 is tubular and covers from a connection barrel part 32 of the connection terminal 3, which is attached to a connection end of the electric wire or cable 2 in which a conductor 21 is covered with a covering layer 22, to the covering layer 22 of the electric wire or cable 2. An inner side of an end portion of the insulating cap 4 on the covering layer 22 side has a convex part pressed against the covering layer 22. The convex part is formed as a projection making point contact with the covering layer 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an insulating cap and an insulating cap mounting jig. [Background technology]

[0002] When connecting the conductors of electric wires and cables to terminal blocks, breakers, and other equipment inside panels, connection terminals are usually attached to the ends of the conductors before the connection is made. When attaching a connection terminal to the conductor of an electric wire or cable, the conductor is inserted into the connecting tube of the connection terminal, and the connecting tube is crimped with a die together with the inserted conductor of the electric wire or cable, thereby establishing an electrical and mechanical connection. Then, a cylindrical insulating cap attached in advance to the outer periphery of the retracted position behind the connection end of the electric wire / cable is moved toward the connection end, so that the connection cylindrical portion of the crimped connection terminal is covered with the cylindrical insulating cap (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6422003 [Patent Document 2] Japanese Patent Application Publication No. 6-111863 Summary of the Invention [Problem to be solved by the invention]

[0004] When attaching a connection terminal to an electric wire or cable whose connection end hangs down, it is necessary to first move the insulating cap to a position slightly above the connection end of the electric wire or cable. In this case, if the insulating cap slides downward, it will interfere with the work of attaching the connection terminal to the connection end, so the insulating cap has been held in place in an upward retracted position with adhesive tape or the like.

[0005] However, as the number of wires and cables to which connection terminals need to be attached increases, the work of taping the insulating caps and removing the tape becomes more difficult.

[0006] An object of the present invention is to reduce the workload involved in attaching a connection terminal to an electric wire or cable. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: A cylindrical insulating cap having insulating properties that covers a connection terminal attached to a connection end of an electric wire / cable whose conductor is covered with a covering layer from a connecting cylindrical portion to the covering layer of the electric wire / cable, The inner end of the cover layer side has a protrusion that is in pressure contact with the cover layer.

[0008] The convex portion is characterized in that it has a protrusion shape that makes point contact with the coating layer. Alternatively, the convex portion is a convex stripe along the circumferential direction of the inner peripheral surface of the insulating cap, and has a tapered surface that widens in the axial direction toward the coating layer. Alternatively, the convex portion, which is a convex stripe along the inner peripheral surface of the insulating cap, is characterized in that it is discontinuous in the circumferential direction. Alternatively, the protrusion is a ridge extending along the central axis of the insulating cap.

[0009] The present invention also provides An attachment jig for an insulating cap having a cylindrical insulating property that covers from a connection tube portion of a connection terminal attached to a connection end of an electric wire / cable whose conductor is covered with a covering layer to the covering layer of the electric wire / cable, The insulating cap is characterized by being wedge-shaped and inserted between the insulating cap and the covering layer.

[0010] The present invention also provides An attachment jig for an insulating cap having a cylindrical insulating property that covers from a connection tube portion of a connection terminal attached to a connection end of an electric wire / cable whose conductor is covered with a covering layer to the covering layer of the electric wire / cable, a plurality of wedges inserted between the insulating cap and the covering layer; The present invention is characterized by having an annular support portion that supports the plurality of wedge-shaped portions and has dividing portions that make the support portion discontinuous in the circumferential direction.

[0011] The present invention also provides An attachment jig for an insulating cap having a cylindrical insulating property that covers from a connection tube portion of a connection terminal attached to a connection end of an electric wire / cable whose conductor is covered with a covering layer to the covering layer of the electric wire / cable, The insulating cap is characterized in that it is annular with a divided portion that is discontinuous in the circumferential direction, and tightens the central side of the electric wire / cable on the outer peripheral surface of the insulating cap. [Effects of the Invention]

[0012] According to the present invention, it is possible to reduce the workload involved in attaching a connection terminal to an electric wire or cable. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an axial cross-sectional view of a connection structure between an electric wire / cable and a connection terminal according to a first embodiment. [Figure 2] FIG. 2 is an axial cross-sectional view of the insulating cap. [Figure 3] FIG. [Figure 4] FIG. 10 is a rear view of the insulating cap as seen from the holding end portion. [Figure 5] 10 is an axial cross-sectional view showing an example in which the axial arrangement of each protrusion is changed. FIG. [Figure 6] 10 is a perspective view of an insulating cap showing an example in which the axial arrangement of each protrusion is changed. FIG. [Figure 7] 10 is a partial cross-sectional view of an insulating cap illustrating a state in which the tip of the holding side end of the insulating cap is in sliding contact with the outer peripheral surface of the coating layer. FIG. [Figure 8] FIG. 10 is a perspective view of a jig used when manufacturing an insulating cap by dipping. [Figure 9] FIG. 4 is a partial cross-sectional view showing the insulating cap during manufacturing. [Figure 10] FIG. 10 is a perspective view of an insulating cap according to a second embodiment. [Figure 11] FIG. 2 is an axial cross-sectional view of an insulating cap and an electric wire / cable. [Figure 12] 12 is an enlarged cross-sectional view of the insulating cap in region P of FIG. 11. [Figure 13] 10 is a perspective view of an insulating cap showing an example in which the axial arrangement of the protrusions is changed. FIG. [Figure 14] 10 is a perspective view showing an example in which a recessed notch is provided at the holding side end of the second cylindrical portion of the insulating cap. FIG. [Figure 15] FIG. 10 is a perspective view of an insulating cap according to a third embodiment. [Figure 16] FIG. 2 is an axial cross-sectional view of an insulating cap attached to an electric wire / cable. [Figure 17] FIG. 10 is a perspective view of an insulating cap according to a fourth embodiment. [Figure 18] FIG. 2 is an axial cross-sectional view of an insulating cap and an electric wire / cable. [Figure 19] 10 is a perspective view of an insulating cap in which a notch is formed in the holding side end of the second cylindrical portion of the insulating cap to separate the protrusion. FIG. [Figure 20] 10 is a perspective view of an insulating cap showing an example in which a convex portion is formed on a tapered surface formed on the holding side end portion of a second cylindrical portion of the insulating cap. FIG. [Figure 21] FIG. 10 is an axial cross-sectional view of an insulating cap according to a fifth embodiment. [Figure 22] 22 is an enlarged cross-sectional view of the area surrounded by the dashed-dotted circle in FIG. 21. [Figure 23] FIG. 2 is an enlarged perspective view of the holding side end of the insulating cap. [Figure 24] 5 is an axial cross-sectional view showing the movement of a protrusion when the insulating cap is attached to an electric wire or cable. FIG. [Figure 25]FIG. 2 is an axial cross-sectional view of the insulating cap after it has been attached to the electric wire / cable. [Figure 26] FIG. 26 is an enlarged cross-sectional view of the area surrounded by the dashed-dotted circle in FIG. 25. [Figure 27] 1 is an axial cross-sectional view of a jig and a mold used in molding to form an insulating cap. FIG. [Figure 28] 28 is an enlarged cross-sectional view of the area surrounded by the dashed-dotted circle in FIG. 27. [Figure 29] FIG. 10 is a perspective view of an insulating cap mounting jig, an insulating cap, and an electric wire / cable according to a sixth embodiment. [Figure 30] FIG. 1 is an axial cross-sectional view of an insulating cap attached to an electric wire / cable. [Figure 31] FIG. 13 is a perspective view of an insulating cap mounting jig, an insulating cap, and an electric wire / cable according to a seventh embodiment. [Figure 32] FIG. [Figure 33] FIG. 1 is an axial cross-sectional view of an insulating cap attached to an electric wire / cable. [Figure 34] FIG. 13 is a perspective view of an insulating cap mounting jig, an insulating cap, and an electric wire / cable according to an eighth embodiment. [Figure 35] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, various embodiments of the connection structure between an electric wire / cable and a connection terminal according to the present invention and related configurations will be described with reference to the drawings. However, although each of the embodiments described below has various limitations that are technically preferable for carrying out the present invention, the scope of the present invention is not limited to the following embodiments or illustrated examples. In the following description, the direction of the center line of an electric wire or cable will be referred to as the "axial direction," the circumferential direction around the center line will be referred to as the "circumferential direction," and the direction perpendicular to the center line will be referred to as the "radial direction."

[0015] [First embodiment] FIG. 1 is an axial cross-sectional view of a connection structure 10 between an electric wire / cable 2 and a connection terminal 3 according to a first embodiment, FIG. 2 is an axial cross-sectional view of an insulating cap 4 attached to the electric wire / cable 2, and FIG. 3 is a perspective view of the insulating cap 4. As shown in the figure, the connection structure 10 has a connection end of an electric wire / cable 2, a connection terminal 3 attached to the connection end, and a cylindrical insulating cap 4 that covers from the connection tubular portion of the connection terminal 3 to the coating layer of the electric wire / cable 2.

[0016] [Wires and cables] The electric wire / cable 2 is formed by covering a conductor 21 with a covering layer 22 . Copper or a copper alloy, or aluminum or an aluminum alloy, is used as the material of the conductor 21 of the electric wire / cable 2. The conductor 21 is formed by twisting together a plurality of wires made of the above materials. The covering layer 22 is made of an insulating material (for example, cross-linked polyethylene, ethylene propylene rubber, or polyvinyl chloride) and covers the entire outer periphery of the conductor 21. The covering layer 22 may be made of two layers, an insulating layer and a protective layer on the outside thereof. However, when attaching the connection terminal 3 to the electric wire / cable 2, the covering layer 22 is peeled off and removed at the connection end over an approximately predetermined length, leaving the conductor 21 exposed over a predetermined length.

[0017] [Connection terminal] The connection terminal 3 has a connection portion 31 at one end for electrically connecting the conductor 21 of the electric wire / cable 2 to a connection destination such as a terminal block, and a connection tube portion 32 at the other end into which the conductor 21 of the electric wire / cable 2 is inserted.

[0018] The connection terminal 3 is integrally formed from copper or a copper alloy, or aluminum or an aluminum alloy. The metal material of the connection terminal 3 may be the same as or different from that of the conductor 21 of the electric wire / cable 2. For example, both may be copper or a copper alloy, or aluminum or an aluminum alloy. Alternatively, one may be copper or a copper alloy and the other may be aluminum or an aluminum alloy. The connected portion 31 has a rectangular flat plate shape extending in the axial direction away from the connecting tube portion 32, and has a circular hole in the center for passing a screw through it to fasten it to the target connection location.

[0019] The connecting tube portion 32 is a cylinder with constant inner and outer diameters, and is closed at the end on the connected portion 31 side. The connecting tube portion 32 has an inner diameter that is slightly larger than the outer diameter of the conductor 21 of the electric wire / cable 2, allowing the conductor 21 to be easily inserted. With the conductor 21 inserted, the connection tube portion 32 is crimped by external compression or crimping to connect the conductor 21 of the electric wire / cable 2 to the connection terminal 3. When the connection tube portion 32 is crimped and connected to the conductor 21, its outer diameter is larger than the outer diameter of the coating layer 22 of the electric wire / cable 2.

[0020] [Insulating cap] The insulating cap 4 is a cylindrical body that covers from the connection tube portion 32 of the connection terminal 3 attached to the connection end of the electric wire / cable 2 to the covering layer 22 of the electric wire / cable 2. The insulating cap 4 is made of an insulating material (for example, polyvinyl chloride, ethylene propylene rubber, silicone rubber, or other insulating resin).

[0021] 1 to 3, the insulating cap 4 has a first cylindrical portion 41 on the connection terminal 3 side, a second cylindrical portion 42 on the electric wire / cable 2 side, and a transition portion 43 located therebetween. The first cylindrical portion 41, the transition portion 43, and the second cylindrical portion 42 are formed concentrically and integrally. Furthermore, both axial ends of the insulating cap 4 are open. Hereinafter, the end of the insulating cap 4 on the connection terminal 3 side will be referred to as the "coating side end" (reference numeral 401), and the end on the electric wire / cable 2 side will be referred to as the "holding side end" (reference numeral 402). The same applies to the other insulating caps 4A to 4F described later.

[0022] The first tubular portion 41 is a cylindrical body with constant inner and outer diameters. The inner diameter of the first tubular portion 41 is equal to or slightly smaller than the outer diameter of the circumscribing circle of the connection tubular portion 32 of the connection terminal 3 in a state where it has been crimped and connected to the conductor 21 (hereinafter referred to as the connection tubular portion 32 after the connection process). However, the inner diameter of the first tubular portion 41 may be slightly larger than the outer diameter of the circumscribing circle of the connection tubular portion 32 after the connection process. Alternatively, the inner diameter of the first tubular portion 41 may be equal to or slightly smaller than the outer diameter of the connection tubular portion 32 before crimping.

[0023] The insulating cap 4 is generally flexible and elastic, so that the first tubular portion 41 can be easily placed over the connecting tubular portion 32 after connection processing. The axial length of the first tubular portion 41 may be approximately equal to or slightly longer than the axial length of the connecting tubular portion 32. The tip of the covering side end 401 of the first cylindrical portion 41 may be formed into a slightly tapered shape by reducing the inner and outer diameters.

[0024] The second tubular portion 42 is a cylindrical body with constant inner and outer diameters. The inner diameter of the second tubular portion 42 is set to be slightly larger than the outer diameter of the covering layer 22 of the electric wire / cable 2, so that the second tubular portion 42 can be easily fitted over the covering layer 22.

[0025] The transition portion 43 has one end connected to the first cylindrical portion 41 and the other end connected to the second cylindrical portion 42 . The inner and outer diameters of one end of the transition portion 43 match those of the first cylindrical portion 41, and the inner and outer diameters of the other end match those of the second cylindrical portion 42. The inner and outer diameters of the transition portion 43 gradually decrease from one end to the other end. Therefore, the outer peripheral surface of the transition portion 43 is a conical surface when viewed from the outside, and the inner peripheral surface is a conical surface when viewed from the inside.

[0026] Near the holding side end 402 of the second cylindrical portion 42, one or more (preferably three or more, four are exemplified here) protrusions 44 are provided on the inner peripheral surface thereof. The protrusions 44 are hemispherical protrusions and are arranged on the same circumference at uniform intervals in the circumferential direction. However, the shape of the axial cross section of the protrusions 44 is not limited to being hemispherical as long as it protrudes toward the coating layer 22. As shown in FIG. 4, the diameter D of the inscribed circle C 1 of the four protrusions 44 is set to be slightly smaller than the outer diameter of the coating layer 22 of the electric wire / cable 2 . Therefore, as shown in FIG. 2, when the electric wire / cable 2 is passed through the insulating cap 4, the tip of each protrusion 44 is pressed against the outer circumferential surface of the coating layer 22 in a point contact state.

[0027] The protrusion 44 can function with at least one protrusion 44, but in that case, the diameter D of the inscribed circle between the tip of the protrusion 44 and the inner surface of the second tubular portion 42 is set to be slightly smaller than the outer diameter of the coating layer 22 of the electric wire / cable 2.

[0028] [Installation of insulating cap] The work of attaching the insulating cap 4 in connection with the work of connecting the electric wire / cable 2 and the connection terminal 3 will be described. For example, it is assumed that the electric wire / cable 2 has already been installed in a hanging state with the connection end side facing downward. At the connection end of the electric wire / cable 2, the covering layer 22 is removed by a predetermined length to expose the conductor 21.

[0029] At the same time, the connection end of the electric wire / cable 2 is inserted into the holding end 402 of the insulating cap 4. At this time, the insulating cap 4 is attached at a position where the entire insulating cap 4 is somewhat spaced apart from the connection end of the electric wire / cable 2, as shown in Fig. 2, so as not to interfere with the operation of connecting the connection terminal 3 to the connection end of the electric wire / cable 2. This position is the standby position of the insulating cap 4. At this time, the connection end of the electric wire / cable 2 is facing downward, and the insulating cap 4 in the standby position is subjected to a downward gravitational load, but since the four protrusions 44 are in pressure contact with the outer peripheral surface of the coating layer 22, the standby position is maintained and the cap is prevented from falling off the connection end of the electric wire / cable 2.

[0030] Then, the conductor 21 of the connection end of the electric wire / cable 2 is inserted into the connection tube portion 32 of the connection terminal 3. Furthermore, the connection tube portion 32 is crimped from the outside by compression or crimping, and the connection terminal 3 and the conductor 21 of the electric wire / cable 2 are mechanically and electrically connected. Thereafter, the insulating cap 4 that was in the standby position is moved toward the connection end of the electric wire / cable 2 against the frictional force caused by the pressure contact of each protrusion 44, and the first tubular portion 41 is placed over the connection tubular portion 32 of the connection terminal 3. As a result, the insulating cap 4 covers the area from the connecting tube portion 32 to the covering layer 22 of the electric wire / cable 2 . As a result, a connection structure 10 consisting of the electric wire / cable 2, the connection terminal 3 and the insulating cap 4 is formed.

[0031] [Technical effect of the first embodiment] In the connection structure 10, the insulating cap 4 has a protrusion 44 on the inside of the holding side end 402, which is in pressure contact with the coating layer 22. Therefore, during the operation of connecting the electric wire / cable 2 and the connection terminal 3, even if the connection end of the electric wire / cable 2 is facing downward, the convex portion 44 holds the coating layer 22, effectively preventing the insulating cap 4 from slipping downward from the standby position or falling off from the connection end of the electric wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and temporary fixing of the insulating cap 4 with adhesive tape is not required, so the connection work is facilitated and the work efficiency is improved.

[0032] The insulating cap 4 has a structure in which the second cylindrical portion 42, which is the end on the coating layer 22 side, has a smaller inner diameter than the first cylindrical portion 41 on the connecting cylindrical portion 32 side. Therefore, the first cylindrical portion 41 having a large inner diameter can be fitted over the connecting cylindrical portion 32 of the connecting terminal 3 connected to the conductor 21 of the electric wire / cable 2 with ease, making it easier to install the insulating cap 4 and enabling the connecting cylindrical portion 32 to be well covered. In particular, when the connection tubular portion 32 of the connection terminal 3 is crimped, the cross-sectional shape of the outer periphery may be deformed from a circular shape, but even with such a deformed connection tubular portion 32, the first tubular portion 41 of the insulating cap 4 can be easily placed over it, making it possible to adequately cover the connection tubular portion 32.

[0033] Furthermore, each protrusion 44 of the insulating cap 4 is in the form of a projection that makes point contact with the coating layer 22, and thus exerts concentrated pressure contact over a small area, providing high holding power and enabling the insulating cap 4 to be effectively held against the electric wire / cable 2.

[0034] [Other placement of protrusions] As shown in FIGS. 5 and 6, each of the protrusions 44 may be formed at a position on the inner circumferential surface of the second cylindrical portion 42 that is closest to the tip of the holding side end portion 402 in the axial direction. If each protrusion 44 is provided at a certain distance from the holding end 402, when the wire / cable 2 is inserted from the holding end 402, as shown in FIG. 7, the tip side of the holding end 402 beyond each protrusion 44 may come into sliding contact with the outer peripheral surface of the coating layer 22 of the wire / cable 2, causing friction and making it difficult to attach the wire / cable 2. However, as shown in Figures 5 and 6, if each protrusion 44 is provided at the position closest to the tip of the holding side end 402 of the second tubular portion 42, when the electric wire / cable 2 is inserted from the holding side end 402, there will be no portion that comes into sliding contact with the coating layer 22 of the electric wire / cable 2, and the insertion can be performed smoothly.

[0035] [Insulating cap manufacturing] A method for manufacturing the insulating cap 4 will now be described. The insulating cap 4 can be manufactured by dipping. Fig. 8 is a perspective view of a jig G used in the dipping process, and Fig. 9 is a partial cross-sectional view showing the state of the insulating cap 4 during manufacturing.

[0036] 8, the jig G for the insulating cap 4 is a rod-like body having the same shape as the internal space of the insulating cap 4. The jig G has portions corresponding to the inner circumferential surfaces of the first cylindrical portion 41, the second cylindrical portion 42, and the transition portion 43, and is also formed with a recess G1 corresponding to the protrusion 44 in the second cylindrical portion 42. First, a release agent is applied to the outer surface of the jig G, and then the outer surface of the jig G is immersed in a dipping tank in which the resin forming the insulating cap 4 is in a molten state, with the portion corresponding to the inner surface of the second cylindrical portion 42 of the jig G facing downward relative to the portion corresponding to the inner surface of the first cylindrical portion 41 of the jig G. Thereafter, when the jig G is pulled out of the dipping tank, the resin material adheres to its outer peripheral surface as shown in Fig. 9, and this is cooled, and air is blown between the jig G and the resin material to separate the jig G and peel the cylindrical resin material from the jig G. Then, the upper and lower ends of the resin material are cut at predetermined positions, and the insulating cap 4 is completed.

[0037] In addition, when the axial position of the convex portion 44 relative to the holding side end portion 402 differs, as in the case of the insulating cap 4 shown in Figure 2 and the insulating cap 4 shown in Figure 5, it is possible to adjust it appropriately by changing the cutting position for forming the holding side end portion 402 in the tubular resin material after demolding.

[0038] [Second embodiment] 10 is a perspective view of an insulating cap 4A according to a second embodiment, FIG. 11 is an axial cross-sectional view of the insulating cap 4A attached to an electric wire / cable 2, and FIG. 12 is an enlarged cross-sectional view of the insulating cap 4A in region P in FIG. This second embodiment illustrates an insulating cap 4A having a different configuration from the previously described insulating cap 4. The electric wires / cables 2 and the connection terminals 3 that constitute the connection structure together with the insulating cap 4A are the same as the electric wires / cables 2 and the connection terminals 3 of the previously described connection structure 10.

[0039] The insulating cap 4A has a different structure from the protrusion 44 in that the structure of the protrusion 44A that presses against the covering layer 22 of the electric wire / cable 2 is different from the protrusion 44, but the other structure is the same as that of the insulating cap 4. Therefore, the same components of the insulating cap 4A as those of the insulating cap 4 are denoted by the same reference numerals as those of the insulating cap 4. Unlike the aforementioned protrusion 44, which is a protrusion that makes point contact with the coating layer 22, the protrusion 44A of the insulating cap 4A consists of a protrusion that runs around the inner surface of the second tubular portion 42 in the circumferential direction. As shown in FIG. 12, the shape of the axial cross section of the protrusion 44A is not limited as long as it protrudes toward the coating layer 22, but here a semicircular shape is shown as an example. The inner diameter of the innermost periphery of the protrusion 44A is equal to or slightly smaller than the outer diameter of the coating layer 22.

[0040] The procedure for attaching the insulating cap 4A is the same as that for the insulating cap 4 described above. Since the convex portion 44A of the insulating cap 4A is a circumferentially extending convex strip, the insulating cap 4A can hold the coating layer 22 from the entire periphery, and can more effectively prevent the insulating cap 4A from slipping downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, the insulating cap 4A does not interfere with the connection work of the electric wire / cable 2 and the connection terminal 3, and also makes the connection work easier by eliminating the need for adhesive tape, thereby contributing to improved work efficiency. Other technical effects are the same as those of the insulating cap 4.

[0041] Also, in the case of the insulating cap 4A, as shown in FIG. 13, the protrusion 44A may be formed at a position on the inner circumferential surface of the second cylindrical portion 42 that is closest to the tip of the holding side end 402 in the axial direction. In the case of the insulating cap 4A, when the electric wire / cable 2 is inserted from the holding side end 402, there is no part that comes into sliding contact with the coating layer 22 of the electric wire / cable 2, and the cap can be attached smoothly.

[0042] 14, the protruding portion 44A formed by the ridge is not limited to a continuous, round configuration, and may be discontinuous in the circumferential direction. For example, as shown in FIG. 14, the protruding portion 44A of the ridge may be divided into the same number of notches 45A as the number of notches 45A by forming a plurality of rectangular recesses 45A at uniform intervals in the circumferential direction in the holding-side end 402 of the second cylindrical portion 42 of the insulating cap 4A. In this case as well, the protrusion 44A may be formed at the position closest to the tip of the holding side end 402 of the second cylindrical portion .

[0043] As described above, the convex portion 44A divided into multiple pieces exerts a reduced force on the coating layer 22 of the electric wire / cable 2 compared to the convex portion 44A of a continuous circumferential convex strip, but such a divided structure does not pose a problem if, for example, the rigidity of the divided second tubular portion 42 supporting the divided convex portion 44A generates a sufficient frictional force between the convex portion 44A and the coating layer 22 to sufficiently restrain the insulating cap 4A. Furthermore, if the convex portion 44A of the ridge is divided, excessive frictional force is not generated when the insulating cap 4A is attached to the electric wire / cable 2, making it easier to move the insulating cap 4A relative to the electric wire / cable 2 and improving workability when forming the connection structure.

[0044] The insulating cap 4A is manufactured in the same manner as the insulating cap 4, except that grooves are formed on the outer peripheral surface of the jig G along the circumferential direction to form the ridge-like protrusions 44A. In addition, in the case of an insulating cap 4A having a segmented convex portion 44A, after forming an unsegmented insulating cap 4A, a rectangular notch 45A can be formed in the holding side end 402 of the second tubular portion 42 by a cutting process.

[0045] [Third embodiment] FIG. 15 is a perspective view of an insulating cap 4B according to the third embodiment, and FIG. 16 is an axial cross-sectional view of the insulating cap 4B attached to the electric wire / cable 2. As shown in FIG. The third embodiment illustrates an insulating cap 4B having a different configuration from the previously described insulating cap 4. The electric wires / cables 2 and the connection terminals 3 that constitute the connection structure together with the insulating cap 4B are the same as the electric wires / cables 2 and the connection terminals 3 of the previously described connection structure 10.

[0046] The insulating cap 4B differs from the protrusion 44 in the structure of the protrusion 44B that presses against the covering layer 22 of the electric wire / cable 2, but the other structures are the same as those of the insulating cap 4. Therefore, the same reference numerals as those of the insulating cap 4 are used for the same components of the insulating cap 4B. Unlike the protrusion 44 described above, which is in point contact with the coating layer 22, the protrusion 44B of the insulating cap 4B is a ridge extending along the axial direction of the second cylindrical portion . The shape of the cross section perpendicular to the axis of the protrusion 44B is not limited as long as it protrudes toward the coating layer 22, but a semicircular shape is shown here as an example. The length of the protrusion 44B is also not limited, but may be, for example, the longest length equal to the axial length of the second tubular portion 42. It is preferable to provide a plurality of protrusions 44B at uniform intervals in the circumferential direction. Here, an example is shown in which four protrusions 44B are provided. The diameter of the inscribed circle at the innermost periphery of each protrusion 44B is slightly smaller than the outer diameter of the coating layer 22.

[0047] The procedure for attaching the insulating cap 4B is the same as that for the insulating cap 4 described above. Since the protrusion 44B of the insulating cap 4B is long in the axial direction, it is pressed against the coating layer 22 over a long range in the axial direction, providing high holding power and enabling the insulating cap 4B to be effectively held against the electric wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and adhesive tape is no longer necessary, making the connection work easier and improving work efficiency. Other technical effects are the same as those of the insulating cap 4.

[0048] The insulating cap 4B is manufactured in the same manner as the insulating cap 4, except that grooves are formed on the outer peripheral surface of the jig G along the axial direction to form the ridge-like protrusions 44B.

[0049] [Fourth embodiment] FIG. 17 is a perspective view of an insulating cap 4C according to the fourth embodiment, and FIG. 18 is an axial cross-sectional view of the insulating cap 4C and the electric wire / cable 2. As shown in FIG. The fourth embodiment illustrates an insulating cap 4C having a different configuration from the previously described insulating cap 4. The electric wires / cables 2 and the connection terminals 3 that constitute the connection structure together with the insulating cap 4C are the same as the electric wires / cables 2 and the connection terminals 3 of the previously described connection structure 10.

[0050] This insulating cap 4C has a similar structure to the above-described protrusion 44A in the protrusion 44C that presses against the covering layer 22 of the electric wire / cable 2, but other structures are the same as those of the insulating cap 4. Therefore, the same reference numerals as those of the insulating cap 4 are used for the same components of the insulating cap 4C as those of the insulating cap 4. The protrusion 44C of the insulating cap 4C is located at the tip of the holding end 402 on the inner circumferential surface of the insulating cap 4C, and is formed as a ridge that runs around the inner circumferential surface of the second cylindrical portion 42 in the circumferential direction. The cross-sectional shape of the protrusion 44C in the axial direction is different from that of the protrusion 44A described above.

[0051] The protrusion 44C is provided at the tip of the holding side end 402 on the inner circumferential surface of the second tubular portion 42, and its axial cross section is not semicircular like the protrusion 44A. The cross section of the protrusion 44C has a sharp wedge shape at the tip of the holding side end 402. As a result, the protrusion 44C is formed on the inner circumferential surface of the second tubular portion 42 on the tip side of the holding side end 402, and is made up of a convex ridge on which a tapered surface 441C in the shape of an expanded cone whose inner diameter increases toward the tip is formed. The inner diameter of the innermost periphery of the protrusion 44C is equal to or slightly smaller than the outer diameter of the coating layer 22.

[0052] The procedure for attaching the insulating cap 4C is the same as that for the insulating cap 4 described above. Since the convex portion 44C of the insulating cap 4C is a circumferentially extending convex strip, it can hold the coating layer 22 from all sides, and more effectively prevents the insulating cap 4C from slipping downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and adhesive tape is no longer necessary, making the connection work easier and improving work efficiency. Furthermore, the convex portion 44C of the insulating cap 4C has a tapered surface 441C, so that the wire / cable 2 can be easily inserted from the holding side end portion 402 of the insulating cap 4C, improving workability. Other technical effects are the same as those of the insulating cap 4.

[0053] Similarly to the protrusion 44A, the protrusion 44C formed of a ridge is not limited to a continuous, round configuration, and may be discontinuous in the circumferential direction. For example, as shown in Fig. 19, a plurality of rectangular recessed notches 45C facing the covering-side end 401 may be formed at uniform intervals in the circumferential direction in the holding-side end 402 of the second tubular portion 42 of the insulating cap 4C, thereby dividing the protrusion 44C into the same number of notches 45C. The effect of the division is the same as that of the protrusion 44A described above.

[0054] The insulating cap 4C is manufactured in the same manner as the insulating cap 4, except that grooves are formed on the outer peripheral surface of the jig G along the circumferential direction to form the ridge-like protrusions 44C. In the case of the insulating cap 4C having the divided ridge-like protrusions 44C, the cutting process is carried out in the same manner as in the case of the insulating cap 4A.

[0055] Furthermore, in the case of the protrusion 44C, the end of the tapered surface 441C closest to the connection terminal 3 has the smallest inner diameter, and the smallest inner diameter part comes into sliding contact with the coating layer 22 of the electric wire / cable 2, but this is not limiting. For example, as in an insulating cap 4D shown in Fig. 20, instead of forming a circumferentially encircling convex stripe on the holding side end 402 of the second tubular portion 42, a widened tapered surface 441D may be formed at the tip of the holding side end 402 of the second tubular portion 42, and multiple protruding convex portions 44D protruding radially inward may be formed on the inner circumferential surface of the tapered surface 441D. In this case, the diameter of the inscribed circle of the multiple convex portions 44D is set to be slightly smaller than the outer diameter of the coating layer 22 of the electric wire / cable 2. Furthermore, each convex portion 44D is shaped to make point contact with the coating layer 22. The insulating cap 4D having such a protrusion 44D also has a tapered surface 441D, so that the wire / cable 2 can be easily inserted from the holding end 402 of the insulating cap 4D, improving workability. In addition, other technical effects are the same as those of the insulating cap 4.

[0056] [Fifth embodiment] 21 is an axial cross-sectional view of an insulating cap 4E according to the fifth embodiment, FIG. 22 is an enlarged cross-sectional view of the area within the dashed-dotted circle in FIG. 21, and FIG. 23 is an enlarged perspective view of a holding end portion 402. As shown in FIG. The fifth embodiment illustrates an insulating cap 4E having a different configuration from the previously described insulating cap 4. The electric wires / cables 2 and the connection terminals 3 that constitute the connection structure together with the insulating cap 4E are the same as the electric wires / cables 2 and the connection terminals 3 of the previously described connection structure 10.

[0057] The insulating cap 4E has a plurality of protrusions 44E that are brought into pressure contact with the covering layer 22 of the electric wire / cable 2, and a plurality of support portions 46E that extend radially inward from the tip of the insulating cap 4E on the covering layer side. The insulating cap 4E has the same first cylindrical portion 41, second cylindrical portion 42, and transition portion 43 as the insulating cap 4 described above.

[0058] Each of the protrusions 44E is individually supported by the tip of each of the support portions 46E. 22, the support portion 46E extends radially inward from the inner edge of the end face of the second tubular portion 42 on the holding-side end portion 402 side toward the coating layer 22 side (one side in the axial direction, the coating layer 22 side facing the connection terminal 3), and a protrusion 44E is formed on the extending end portion. The support portion 46E has a thin, rectangular shape. The support portion 46E may extend from the tip of the inner circumferential surface of the second tubular portion 42 on the holding-side end portion 402 side. The support portion 46E may extend radially inward, and may extend toward the connection terminal 3 side (the other side in the axial direction, the connection terminal 3 side with respect to the coating layer 22) rather than toward the coating layer 22 side. The support portion 46E may extend radially inward and not be inclined toward either the coating layer 22 side or the connection terminal 3 side.

[0059] Each support portion 46E extends radially inward, and therefore, as shown in FIG. 24, when the electric wire / cable 2 is inserted from the holding side end portion 402 of the insulating cap 4E, it abuts against the tip of the electric wire / cable 2 and is folded back toward the connection terminal 3 inside the holding side end portion 402. Furthermore, when the insulating cap 4E is moved further inward from the connection end of the electric wire / cable 2, as shown in Figures 25 and 26, at the tip of the folded-back support portion 46E, the convex portion 44E is sandwiched between the inner surface of the second tubular portion 42 and the outer surface of the coating layer 22 and is pressed against the coating layer 22.

[0060] Each protrusion 44E is formed in a direction that protrudes toward the cover layer 22 side with respect to each support portion 46E, with the support portion 46E facing the connection terminal 3 side. Each of the protrusions 44E is a semispherical protrusion, and the protrusions 44E and the support portions 46E are arranged on the same circumference at uniform intervals in the circumferential direction. Furthermore, when each convex portion 44E is oriented so as to be convex toward the coating layer 22 on the inner surface of the second tubular portion 42, the diameter of the inscribed circle of each convex portion 44E is set to be slightly smaller than the outer diameter of the coating layer 22. The shape of the axial cross section of the protrusion 44E may be any shape that protrudes toward the coating layer 22, and the protrusion 44E is not limited to a hemisphere.

[0061] The procedure for attaching the insulating cap 4E is the same as that for the insulating cap 4 described above. When the wire / cable 2 is inserted into the insulating cap 4E from the holding end 402 side, the convex portion 44E faces the coating layer 22 side, and the insulating cap 4E can hold the coating layer 22 from all sides, more effectively preventing the insulating cap 4E from slipping downward from the standby position or falling off the connection end of the wire / cable 2. Therefore, the connection work between the electric wire / cable 2 and the connection terminal 3 is not hindered, and adhesive tape is no longer necessary, making the connection work easier and improving work efficiency. Furthermore, since each protrusion 44E is supported by a support portion 46E, when the insulating cap 4E is attached to the electric wire / cable 2, the holding side end portion 402 of the insulating cap 4E is unlikely to be pulled inward, which allows the work of connecting the electric wire / cable 2 and the connection terminal 3 to be carried out smoothly, further improving work efficiency. Other technical effects are the same as those of the insulating cap 4.

[0062] [Insulating cap manufacturing] A method for manufacturing the insulating cap 4E will be described. The insulating cap 4E can be manufactured by molding. Fig. 27 is an axial cross-sectional view of a jig GE and a mold ME used in molding, and Fig. 28 is an enlarged perspective view of the area within the dashed-dotted circle in Fig. 27.

[0063] 27, the jig GE of the insulating cap 4E is a rod-like body having the same shape as the internal space of the insulating cap 4E. The jig GE has portions corresponding to the inner circumferential surfaces of the first cylindrical portion 41, the second cylindrical portion 42, and the transition portion 43, but does not have portions corresponding to the protrusions 44E and the support portions 46E. The mold ME is a pair of upper and lower halves separated by a jig GE. The mold ME has a recess for storing the jig GE when the upper and lower halves are joined together, and also has a clearance space formed on the outer circumferential surface of the jig GE for forming the first cylindrical portion 41, the second cylindrical portion 42, and the transition portion 43 of the insulating cap 4E. Furthermore, the jig GE has a conical portion GE2 whose diameter is reduced from the end of a portion corresponding to the inner circumferential surface of the second cylindrical portion 42. The mold ME has a recess formed therein that corresponds to the conical portion GE2, as well as recesses ME1 and ME2 that form gap spaces for forming the protrusions 44E and the support portions 46E.

[0064] Each support portion 46E is formed along the outer peripheral surface of the conical portion GE2 of the jig GE, and can be formed in an inclined direction along the coating layer 22 side on the radially inner side. As mentioned above, each support portion 46E does not have to face the coating layer 22 side in the axial direction as long as it faces radially inward, but by configuring each support portion 46E to face radially inward and in an inclined direction that faces the coating layer 22 side in the axial direction, it is possible to easily manufacture the support portion 46E by molding using the jig GE and the mold ME. For example, if each support portion 46E faces radially inward and in an inclined direction that faces the connection terminal 3 side in the axial direction, a mold with a complex configuration is required, which reduces manufacturability. Furthermore, when each support portion 46E is formed in the above-mentioned orientation, after the resin is injected into the mold ME and the material resin hardens, it has good demoldability, which also makes it possible to improve manufacturability.

[0065] [Sixth embodiment] FIG. 29 is a perspective view of the mounting jig GF for the insulating cap 4F according to the sixth embodiment, the insulating cap 4F, and the electric wire / cable 2, and FIG. 30 is an axial cross-sectional view thereof. In this sixth embodiment, the insulating cap 4F does not have a structure for holding the electric wire / cable 2. That is, the insulating cap 4F has a configuration in which all of the protrusions 44 have been removed from the insulating cap 4 described above.

[0066] An attachment jig GF suitable for forming a connection structure using the insulating cap 4F, the electric wire / cable 2, and the connection terminal 3 will now be described. The mounting jig GF is a substantially rectangular parallelepiped, and has a wedge shape with a tapered surface GF1 where a corner on one end is removed, so that the mounting jig GF has a sharpened shape on one end. The connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4F is connected in the same procedure as the connection structure consisting of the above-mentioned electric wire / cable 2, the connection terminal 3, and the insulating cap 4. In this connection, the electric wire / cable 2 is inserted from the holding side end 402 of the insulating cap 4F, and when the insulating cap 4F is placed in the retracted position, the sharpened end of the mounting jig GF is inserted between the coating layer 22 and the holding side end 402 of the second tubular portion 42 of the insulating cap 4F. This allows the inner surface of the second tubular portion 42 of the insulating cap 4F and the mounting jig GF to be pressed against the coating layer 22, and the insulating cap 4F can be held in the retracted position even when the connection end of the electric wire / cable 2 is facing downward. Furthermore, after the connection terminal 3 is attached to the conductor 21 of the electric wire / cable 2, the mounting jig GF can be pulled out, allowing the insulating cap 4F to be easily moved and cover the connection tube portion 32 of the connection terminal 3.

[0067] As described above, the mounting jig GF effectively prevents the insulating cap 4F from moving downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, the insulating cap 4F can be prevented from interfering with the connection work of the electric wire / cable 2 and the connection terminal 3. Furthermore, the mounting jig GF can hold and release the insulating cap 4F simply by inserting and removing it into the gap between the coating layer 22 and the second tubular portion 42 of the insulating cap 4F, eliminating the need for adhesive tape, making the connection work easier and improving work efficiency. Furthermore, the mounting jig GF can be reused over and over again, making it more economical than adhesive tape.

[0068] The attachment jig GF may have a contact surface on the coating layer 22 side that has a concave peripheral shape corresponding to the peripheral shape of the coating layer 22. In addition, a projection for removal may be provided on the end opposite to the sharp end of the mounting jig GF.

[0069] The attachment jig GF may have a contact surface on the coating layer 22 side that has a concave peripheral shape corresponding to the peripheral shape of the coating layer 22. In addition, a projection for removal may be provided on the end opposite to the sharp end of the mounting jig GF.

[0070] [Seventh embodiment] Figure 31 is an oblique view of an installation jig GG for an insulating cap 4F according to the seventh embodiment, the insulating cap 4F, and an electric wire / cable 2, Figure 32 is an oblique view of the installation jig GG, and Figure 33 is an axial cross-sectional view of the insulating cap 4F attached to the electric wire / cable 2. Similar to the sixth embodiment, the seventh embodiment is directed to an insulating cap 4F that does not have a holding structure.

[0071] An attachment jig GG suitable for forming a connection structure using the insulating cap 4F, the electric wire / cable 2, and the connection terminal 3 will now be described. The mounting jig GG has an annular support portion GG1 that is partially discontinuous in the circumferential direction, and a plurality of wedge-shaped portions GG2 that extend from the annular support portion GG1 along one side of the center line of the annular support portion GG1. The mounting jig GG is made of a flexible material, such as resin.

[0072] The annular support portion GG1 has a divided portion GG3 that is discontinuous in the circumferential direction, and has a substantially C-shape when viewed from the axial direction. The inner diameter of the support portion GG1 may be equal to or slightly larger than the outer diameter of the coating layer 22. Each wedge-shaped portion GG2 is formed so as to become thinner in the radial direction from its base end on the support portion GG1 side toward its end extending in one axial direction. The radially inner surface of each wedge-shaped portion GG2 is flush with the radially inner surface of the support portion GG1.

[0073] The connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4F is connected in the same procedure as the connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4 described above. In this case, the electric wire / cable 2 may be inserted through the support portion GG1 of the mounting jig GG before inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F. Alternatively, after inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F, the dividing portion GG3 may be pushed open so that it faces the holding side end 402 of the insulating cap 4F, and the mounting jig GG may be attached to the electric wire / cable 2. In either case, the tip of each wedge-shaped portion GG2 is attached in a direction facing the holding side end 402 of the insulating cap 4F. Then, when placing the insulating cap 4F in the retracted position, the tip of each of the pointed wedge-shaped portions GG2 of the mounting jig GG is inserted between the coating layer 22 and the holding side end portion 402 of the second tubular portion 42 of the insulating cap 4F. This allows the inner peripheral surface of the mounting jig GG to be pressed against the coating layer 22, and the insulating cap 4F to be held in the retracted position even when the connection end of the electric wire / cable 2 is facing downward. Furthermore, after the connection terminal 3 is attached to the conductor 21 of the electric wire / cable 2, the attachment jig GG is pulled out, and the divided portion GG3 is pushed apart and removed from the electric wire / cable 2, so that the insulating cap 4F can be easily moved and the connection tube portion 32 of the connection terminal 3 can be covered.

[0074] As described above, the mounting jig GG effectively prevents the insulating cap 4F from sliding downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, the insulating cap 4F can be prevented from interfering with the connection work of the electric wire / cable 2 and the connection terminal 3. Furthermore, the mounting jig GG can hold and release the insulating cap 4F simply by inserting and removing it into the gap between the coating layer 22 and the second tubular portion 42 of the insulating cap 4, eliminating the need for adhesive tape, making the connection work easier and improving work efficiency. Furthermore, the mounting jig GG can be reused over and over again, making it more economical than adhesive tape.

[0075] [Eighth embodiment] FIG. 34 is a perspective view of an installation jig GH for an insulating cap 4F according to the eighth embodiment, the insulating cap 4F, and the electric wire / cable 2, and FIG. 35 is a perspective view of the installation jig GH. Similar to the sixth embodiment, the eighth embodiment is directed to an insulating cap 4F that does not have a holding structure.

[0076] An attachment jig GH suitable for forming a connection structure using the insulating cap 4F, the electric wire / cable 2, and the connection terminal 3 will now be described. The mounting jig GH has an annular main body GH1 that is discontinuous in the circumferential direction. The mounting jig GH is made of a flexible material, such as resin. The annular main body GH1 has a dividing portion GH3 that is discontinuous in the circumferential direction, and has a substantially C-shape when viewed from the axial direction. The inner diameter of the main body GH1 is slightly smaller than the outer diameter of the second cylindrical portion 42 of the insulating cap 4.

[0077] The connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4F is connected in the same procedure as the connection structure consisting of the electric wire / cable 2, the connection terminal 3, and the insulating cap 4 described above. In this case, the electric wire / cable 2 may be inserted into the main body GH1 of the mounting jig GH before inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F. Alternatively, after inserting the electric wire / cable 2 from the holding side end 402 of the insulating cap 4F, the dividing portion GH3 may be pushed open so that the dividing portion GH3 faces the holding side end 402 of the insulating cap 4F, and the mounting jig GH may be attached to the electric wire / cable 2. Then, the insulating cap 4F is placed in the retracted position, and the divided portion GH3 of the mounting jig GH is pushed open to place the mounting jig GH on the outer peripheral surface of the second cylindrical portion 42 of the insulating cap 4. As a result, the second tubular portion 42 of the insulating cap 4F is tightened radially inward by the mounting jig GH, and the inner surface of the second tubular portion 42 is pressed against the coating layer 22, so that the insulating cap 4F can be held in the retracted position even when the connection end of the electric wire / cable 2 is facing downward. Furthermore, after the connection terminal 3 is attached to the conductor 21 of the electric wire / cable 2, the divided portion GH3 of the attachment jig GH can be pushed apart and removed from the electric wire / cable 2, allowing the insulating cap 4F to be easily moved and covering the connection tube portion 32 of the connection terminal 3.

[0078] As described above, the mounting jig GH effectively prevents the insulating cap 4F from sliding downward from the standby position or from falling off the connection end of the electric wire / cable 2. Therefore, the insulating cap 4F can be prevented from interfering with the connection work of the electric wire / cable 2 and the connection terminal 3. Furthermore, the mounting jig GH can hold or release the insulating cap 4F simply by attaching or removing it from the outer surface of the second tubular portion 42, eliminating the need for adhesive tape, making the connection work easier and improving work efficiency. Furthermore, the mounting jig GH can be reused any number of times, making it more economical than adhesive tape.

[0079] [others] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments. For example, in the embodiments, a component integrally formed from a single member may be replaced with a component divided into multiple members that are connected or fixed to each other. Furthermore, a component formed by connecting multiple members may be replaced with a component integrally formed from a single member. In addition, the details shown in the embodiments may be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0080] 2. Wires and cables 21 Conductor 22 Covering layer 3 Connection terminal 4,4A~4F Insulation cap 41 First cylinder part 42 Second cylinder part 43 Transition 44, 44A~44E Convex part 45A, 45C notch 46E Support part 401 Coated end 402 Holding side end 441C, 441D tapered surface 10. Connection structure 31 Connected part 32 Connecting tube G jig G1 recess GE Jig GE2 conical section GF mounting jig GF1 tapered surface GG mounting jig GG1 support part GG2 cuneiform GG3 Divided part GH mounting jig GH1 main body GH3 Divided Section ME mold ME1,ME2 recess

Claims

1. A cylindrical insulating cap having insulating properties that covers a connection terminal attached to a connection end of an electric wire / cable having a conductor covered with a covering layer from a connection cylindrical portion of the connection terminal to the covering layer of the electric wire / cable, a protrusion that is in pressure contact with the coating layer on the inner side of the end portion on the coating layer side, The insulating cap is characterized in that the convex portion has a protrusion shape that makes point contact with the coating layer.

2. 2. The insulating cap according to claim 1, wherein the protrusion is supported by a support portion extending radially inward from a tip of the insulating cap on the coating layer side, and the insulating cap is pressed against the coating layer when attached to the outer periphery of the electric wire / cable.

3. A cylindrical insulating cap having insulating properties that covers a connection terminal attached to a connection end of an electric wire / cable having a conductor covered with a covering layer from a connection cylindrical portion of the connection terminal to the covering layer of the electric wire / cable, a protrusion that is in pressure contact with the coating layer on the inner side of the end portion on the coating layer side, The insulating cap is characterized in that the convex portion is a convex stripe along the circumferential direction of the inner surface of the insulating cap, and has a tapered surface that widens axially toward the coating layer side.

4. A cylindrical insulating cap having insulating properties that covers a connection terminal attached to a connection end of an electric wire / cable having a conductor covered with a covering layer from a connection cylindrical portion of the connection terminal to the covering layer of the electric wire / cable, a protrusion that is in pressure contact with the coating layer on the inner side of the end portion on the coating layer side, An insulating cap, wherein the convex portion, which is a convex stripe along the inner peripheral surface of the insulating cap, is discontinuous in the circumferential direction.

5. A cylindrical insulating cap having insulating properties that covers a connection terminal attached to a connection end of an electric wire / cable having a conductor covered with a covering layer from a connection cylindrical portion of the connection terminal to the covering layer of the electric wire / cable, a protrusion that is in pressure contact with the coating layer on the inner side of the end portion on the coating layer side, The insulating cap, wherein the convex portion is a convex stripe extending along a central axis of the insulating cap.

6. An attachment jig for an insulating cap having a cylindrical shape and insulating properties that covers a connection end of an electric wire / cable whose conductor is covered with a covering layer from a connecting cylindrical portion of a connection terminal attached to the connection end of the electric wire / cable to the covering layer of the electric wire / cable, An insulating cap mounting jig, characterized in that it is wedge-shaped and is inserted between the insulating cap and the coating layer.

7. An attachment jig for an insulating cap having a cylindrical shape and insulating properties that covers a connection end of an electric wire / cable whose conductor is covered with a covering layer from a connecting cylindrical portion of a connection terminal attached to the connection end of the electric wire / cable to the covering layer of the electric wire / cable, a plurality of wedges inserted between the insulating cap and the covering layer; an annular support portion that supports the plurality of wedge-shaped portions and has a divided portion that is discontinuous in the circumferential direction;

8. An attachment jig for an insulating cap having a cylindrical shape and insulating properties that covers a connection end of an electric wire / cable whose conductor is covered with a covering layer from a connecting cylindrical portion of a connection terminal attached to the connection end of the electric wire / cable to the covering layer of the electric wire / cable, An insulating cap installation jig having a ring shape with a circumferentially discontinuous divided portion, characterized in that the insulating cap is tightened toward the center of the electric wire / cable on the outer peripheral surface thereof.

Images