Code end

Abstract

To provide a cord end which enables smooth insertion of a plug into a socket.SOLUTION: A cord end 10 includes: a cylindrical socket 20 where a first opening 26 and a second opening 27 are formed, and which allows insertion of string end parts 41A, 41B into the first opening 26; and a plug 30 which is inserted in the second opening 27 of the socket 20. The plug 30 has: a base part 31; and a guide part 32 which extends from the base part 31 in an insertion direction of the plug 30 and is arranged between the string end parts 41A, 41B. The guide part 32 includes: a base end side part 321 which is connected to the base part 31; and a tip end side part 322 which is a portion close to a tip end side compared to the base end side part 321 and has a width larger than the base end side part 321 in a width direction in which the string end parts 41A, 41B are arranged in parallel. On each of side surfaces 320A, 320B of the guide part 32 facing the string end parts 41A, 41B in the width direction, a step part 323 by the base end side part 321 and the tip end side part 322 is formed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a cord end attached to a cord end portion.

Background Art

[0002] Conventionally, a cord end attached to a cord end portion that has been subjected to end processing such as heat cutting is known. For example, Patent Document 1 discloses a cord end (cord stopper) including a plug in which two cord end portions are arranged and a socket into which the plug is inserted.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A cord end portion that has been subjected to end processing such as heat cutting may be deformed so as to increase the cross-sectional area. However, in the cord end of Patent Document 1 described above, such deformation of the cord end portion is not considered, so there is a possibility that the deformed cord end portion interferes with the socket and makes it difficult to insert the plug.

[0005] An object of the present invention is to provide a cord end that can smoothly insert a plug into a socket.

Means for Solving the Problems

[0006] The code end according to one embodiment of the present invention includes a cylindrical socket in which a first opening and a second opening are formed, and two string end portions are inserted into the first opening, and a plug inserted into the second opening of the socket. The plug has a base portion and a guide portion that extends from the base portion along the insertion direction of the plug and is disposed between the two string end portions. The guide portion includes a proximal end side portion connected to the base portion and a distal end side portion that is a portion on the distal end side of the proximal end side portion and has a larger dimension than the proximal end side portion in the width direction in which the two string end portions are arranged in parallel. On each side surface of the guide portion facing the string end portion in the width direction, a stepped portion formed by the proximal end side portion and the distal end side portion is formed. According to such a configuration, while the distal end side portion of the guide portion of the plug sandwiches the intermediate portion of the string end portion between the other elements of the plug or the socket, the proximal end side portion of the guide portion of the plug secures a space for accommodating the end portion of the string end portion between the other elements of the plug or the socket. By securing a space for accommodating the end portion of the string end portion, which may be deformed by end processing, it is possible to suppress the string end portion from interfering with the socket, and the plug can be smoothly inserted into the socket.

[0007] In one embodiment of the present invention, the plug further has a pair of legs extending from the base portion along the insertion direction on both sides of the guide portion in the width direction, and the legs are preferably elastically deformable so as to sandwich the string end portion between the guide portion. With such a configuration, the string end portion can be sandwiched by the plug alone, and the operation of inserting the plug into the socket becomes easy.

[0008] In one embodiment of the present invention, it is preferable that the dimension of the distal end side portion in the width direction gradually decreases from the stepped portion toward the insertion direction. With such a configuration, since the distal end side portion is likely to come into contact with the string end portion at multiple points, the holding force of the string end portion can be improved.

[0009] In one embodiment of the present invention, the plug further has a pair of plate portions provided on both sides in the width direction of the tip-side portion, and the plate portions preferably face the string end portions in the thickness direction intersecting each of the insertion direction and the width direction. With such a configuration, the plate portion can support the string end portion set in the plug.

[0010] In one embodiment of the present invention, the base portion includes a fitting portion that fits into the second opening of the socket, and a pair of protruding portions that protrude from the fitting portion in the insertion direction and face the two string end portions in the insertion direction. On at least one side of the protruding portion in the thickness direction intersecting each of the insertion direction and the width direction, it is preferable that a base-side stepped portion is formed by the fitting portion and the protruding portion. According to such a configuration, a gap space is formed between the base-side stepped portion of the plug and the socket. When there is fraying in the string end portion, the fraying is accommodated in the gap space, thereby suppressing being caught between the plug and the socket, and enabling the plug to be reliably inserted into the socket.

[0011] In one embodiment of the present invention, the dimension in the width direction of the base-end side portion is preferably in the range of 1 / 4 to 1 / 2 with respect to the dimension in the width direction of the portion adjacent to the base-end side portion in the tip-side portion. Also, in one embodiment of the present invention, the dimension in the insertion direction of the base-end side portion is preferably in the range of 1 / 5 to 1 / 2 with respect to the dimension in the insertion direction of the guide portion. With such a configuration, it is possible to suitably achieve both the holding of the string end portion and the formation of the accommodation space for the terminal portion of the string end portion.

Effect of the Invention

[0012] According to the present invention, it is possible to provide a cord end that can smoothly insert a plug into a socket.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the cord end 10 of the present embodiment includes a cylindrical socket 20 and a plug 30 inserted into the socket 20, and is attached to two cord end portions 41A and 41B of the cord 40. Hereinafter, the insertion direction of the plug 30 into the socket 20 is defined as the Y direction, and the cord end portions 41A and 41B are arranged in parallel in the X direction orthogonal to the Y direction. Further, the direction orthogonal to the X direction and the Y direction is defined as the Z direction (the thickness direction of the cord end 10).

[0015] In the present embodiment, the cord 40 is a general term for so-called cord-like bodies that can be bundled, etc., and examples include general cords, wires, cables, tapes, or belts. The cross-sectional shape, material, and usage form of the cord 40 are not particularly limited. For example, by inserting the cord 40 through the hole of the slider of the zipper and bending it into two, and attaching the cord end 10 to the cord end portions 41A and 41B, it can be used as a knob when operating the slider.

[0016] The configuration of the socket 20 will be described with reference to FIGS. 1 to 3. The socket 20 is, for example, an injection-molded product of synthetic resin, and includes an upper wall portion 21 and a lower wall portion 22 that face each other in the Z direction, and side wall portions 23 and 24 that connect between the upper wall portion 21 and the lower wall portion 22 at both ends in the X direction. Further, in the socket 20, an accommodation space 25 surrounded by the upper wall portion 21, the lower wall portion 22, and the side wall portions 23 and 24, a first opening 26 that communicates with one side in the Y direction of the accommodation space 25, and a second opening 27 that communicates with the other side in the Y direction of the accommodation space 25 are formed. Note that in FIGS. 1 and 2, the illustration of the upper wall portion 21 is omitted.

[0017] In the present embodiment, the distance in the Z direction between the upper wall portion 21 and the lower wall portion 22, that is, the dimension of the accommodation space 25 in the Z direction, is substantially constant along the Y direction. On the other hand, the distance in the X direction between the side wall portions 23 and 24, that is, the dimension of the accommodation space 25 in the X direction, gradually decreases as it progresses in the Y direction. Further, on the inner surfaces of the upper wall portion 21 and the lower wall portion 22, rail portions 211 and 221 that engage with a guide groove 325 of a plug 30 described later are provided along the Y direction. Further, in each of the upper wall portion 21 and the lower wall portion 22, hole portions 212 and 222 that engage with a convex portion 313 of the plug 30 described later are provided.

[0018] The configuration of the plug 30 will be described with reference to FIGS. 1 to 4. The plug 30 is, for example, an injection-molded product of synthetic resin, and as shown in FIG. 4, includes a base portion 31, a guide portion 32 that extends along the Y direction from the base portion 31, a pair of leg portions 33A and 33B that extend along the Y direction from the base portion 31 on both sides in the X direction with respect to the guide portion 32, and a pair of plate portions 34A and 34B provided on both sides in the X direction of the guide portion 32.

[0019] The base portion 31 includes a fitting portion 311 and a pair of protruding portions 312A and 312B provided on the fitting portion 311. The fitting portion 311 is a portion that closes the second opening 27 by fitting into the second opening 27 of the socket 20. Further, on each surface on both sides in the Z direction of the fitting portion 311, convex portions 313 that engage with the respective hole portions 212 and 222 of the socket 20 are provided. The protruding portion 312A protrudes in the Y direction from the fitting portion 311 between the guide portion 32 and the leg portion 33A, and the protruding portion 312B protrudes in the Y direction from the fitting portion 311 between the guide portion 32 and the leg portion 33B.

[0020] In the present embodiment, as shown in FIG. 3, base side step portions 313A are formed by the fitting portion 311 and the protruding portion 312A on both sides of the protruding portion 312A in the Z direction. As a result, a gap in the Z direction is formed between the protruding portion 312A and the socket 20. Further, the protruding portion 312B has the same configuration as the protruding portion 312A, and base side step portions 313B (see FIG. 4) are formed by the fitting portion 311 and the protruding portion 312B on both sides of the protruding portion 312B in the Z direction. As a result, a gap in the Z direction is formed between the protruding portion 312B and the socket 20.

[0021] As shown in FIG. 4, the guide portion 32 is a portion that extends along the Y direction from the base portion 31 and is disposed between the two string end portions 41A and 41B, and has a pair of side surfaces 320A and 320B facing outward in the X direction. Further, the guide portion 32 includes a base end side portion 321 connected to the base portion 31 and a tip side portion that is a portion on the tip side of the base end side portion 321 and has a larger X direction dimension than the base end side portion 321. Step portions 323 are formed on the side surfaces 320A and 320B of the guide portion 32 by the base end side portion 321 and the tip side portion 322. Further, a plurality of groove portions 324 are formed in portions of the side surfaces 320A and 320B of the guide portion 32 corresponding to the tip side portion 322. The groove portions 324 penetrate the tip side portion 322 in the Z direction. Further, a guide groove 325 that engages with the above-described rail portions 211 and 221 is formed along the Y direction in the tip side portion 322 of the guide portion 32.

[0022] The dimension of the tip side portion 322 in the X direction gradually decreases from the step portion 323 toward the tip side (Y direction) of the guide portion 32. Here, it is preferable that the dimension W1 of the base end side portion 321 in the X direction is in the range of 1 / 4 to 1 / 2 with respect to the dimension W2 of the portion of the tip side portion 322 adjacent to the base end side portion 321 in the X direction. Further, it is preferable that the dimension D1 of the base end side portion 321 in the Y direction is in the range of 1 / 5 to 1 / 2 with respect to the dimension D2 of the guide portion 32 in the Y direction.

[0023] The leg portions 33A and 33B extend along the Y direction from the base portion 31 on both sides in the X direction with respect to the guide portion 32 and are elastically deformable inward in the X direction. For example, as shown in FIG. 4, in a state before the plug 30 is inserted into the socket 20, the leg portions 33A and 33B are slightly inclined with respect to the Y direction so as to face outward in the X direction toward the tip side (Y direction). On the other hand, as shown in FIG. 2, in a state where the plug 30 is inserted into the socket 20, the leg portions 33A and 33B are elastically deformed inward in the X direction and are slightly inclined with respect to the Y direction so as to face inward in the X direction toward the tip side. At this time, the leg portions 33A and 33B are arranged along a direction parallel to the portion of the tip side portion 322 of the side surfaces 320A and 320B of the guide portion 32.

[0024] In addition, a plurality of claw portions 331 protruding inward in the X direction are provided at portions of the leg portions 33A and 33B facing the tip side portion 322. In a state where the plug 30 is inserted into the socket 20, the distance in the X direction from the tip of each claw portion 331 to the tip side portion 322 is substantially equal among the plurality of claw portions 331.

[0025] The pair of plate portions 34A and 34B are connected to one end portion of the tip side portion 322 in the Z direction on both sides in the X direction with respect to the tip side portion 322 of the guide portion 32 and each have a plate shape extending along the XY plane. In the present embodiment, the plate portions 34A and 34B are connected not to the entire range of the tip side portion 322 in the Y direction but to a partial range closer to the step portion 323.

[0026] In the plug 30 described above, a string arrangement space 35A in which the string end portion 41A is arranged is formed between the guide portion 32 and the leg portion 33A, and a string arrangement space 35B in which the string end portion 41B is arranged is formed between the guide portion 32 and the leg portion 33B. Here, as illustrated in FIG. 2, after the plug 30 is inserted into the socket 20, in the string arrangement spaces 35A and 35B, the dimension W4 in the X direction between the base end side portion 321 and the leg portion 33B (or the leg portion 33A) is larger than the dimension W3 in the X direction between the tip end side portion 322 and the leg portion 33B (or the leg portion 33A). Further, the space between the base end side portion 321 and the leg portions 33A and 33B functions as terminal accommodation spaces 350A and 350B for accommodating the respective terminal portions 411 of the string end portions 41A and 41B, as will be described later. Regarding the string end portions 41A and 41B, a portion close to the end face of the string end portions 41A and 41B is defined as the terminal portion 411, and a portion farther from the end face than the terminal portion 411 is defined as the intermediate portion 412.

[0027] Next, a usage example of the cord end 10 according to the present embodiment will be described. First, as shown in FIG. 5, the operator inserts the string end portions 41A and 41B of the string 40 into the socket 20 from the first opening 26 toward the second opening 27, and then arranges them in the string arrangement spaces 35A and 35B of the plug 30, respectively. At this time, the operator may place the string end portions 41A and 41B on the plate portions 34A and 34B from one side in the Z direction. The plate portions 34A and 34B face the intermediate portions 412 of the string end portions 41A and 41B in the Z direction and can support the string end portions 41A and 41B. Further, the terminal portions 411 of the string end portions 41A and 41B are accommodated in the terminal accommodation spaces 350A and 350B of the plug 30.

[0028] Next, the operator inserts the plug 30 into the second opening 27 of the socket 20 in the Z direction. At this time, the operator grasps the leg portions 33A, 33B of the plug 30 from both sides in the X direction, and elastically deforms the leg portions 33A, 33B inward in the X direction, so that the string end portions 41A, 41B are sandwiched between the leg portions 33A, 33B and the guide portion 32. Each claw portion 331 on the leg portions 33A, 33B bites into the string end portions 41A, 41B and holds the string end portions 41A, 41B. Further, the rail portion 211 of the socket 20 is inserted into the guide groove 325, and the plug 30 is guided by the guide portion 32.

[0029] After that, as shown in FIG. 2, the plug 30 is inserted into the socket 20. At this time, each convex portion 313 of the fitting portion 311 engages with the hole portions 212, 222 of the socket 20 to prevent the plug 30 from coming off. Further, the leg portions 33A, 33B are pressed inward in the X direction by the side wall portions 23, 24 of the socket 20, so as to maintain the elastically deformed state and the state of sandwiching the string end portions 41A, 41B between the leg portions 33A, 33B and the guide portion 32. Thereby, the cord end 10 is attached to the string end portions 41A, 41B.

[0030] (Effect of this Embodiment) As described above, the cord end 10 of this embodiment includes a cylindrical socket 20 in which the first opening 26 and the second opening 27 are formed and the string end portions 41A, 41B are inserted into the first opening 26, and a plug 30 inserted into the second opening 27 of the socket 20. The plug 30 has a base portion 31 and a guide portion 32 that extends from the base portion 31 along the insertion direction (Y direction) of the plug 30 and is disposed between the string end portions 41A, 41B in the socket 20. The guide portion 32 includes a base end side portion 321 connected to the base portion 31 and a tip end side portion that is a portion on the tip end side of the base end side portion 321 and has a width larger than that of the base end side portion 321 in the width direction (X direction) in which the string end portions 41A, 41B are arranged in parallel. Step portions 323 formed by the base end side portion 321 and the tip end side portion 322 are formed on each side surface 320A, 320B of the guide portion 32 facing the string end portions 41A, 41B in the X direction. In this embodiment, the tip-side portion 322 of the guide portion 32 of the plug 30 sandwiches the intermediate portion 412 of the string end portions 41A and 41B between the other elements of the plug 30 (here, the leg portions 33A and 33B), and the base-end side portion 321 of the guide portion 32 secures the terminal accommodation spaces 350A and 350B between the leg portions 33A and 33B. Since the terminal accommodation spaces 350A and 350B can accommodate the terminal portions 411 that may be deformed by the end processing, it is possible to suppress the string end portions 41A and 41B from interfering with the socket 20, and the plug 30 can be smoothly inserted into the socket 20.

[0031] In this embodiment, the plug 30 further has a pair of leg portions 33A and 33B extending along the Y direction from the base portion 31 on both sides in the X direction with respect to the guide portion 32, and the leg portions 33A and 33B are elastically deformable so as to sandwich the string end portions 41A and 41B between the guide portion 32. With such a configuration, the string end portions 41A and 41B can be sandwiched by the plug 30 alone, and the operation of inserting the plug 30 into the socket 20 becomes easy.

[0032] Further, in this embodiment, the width dimension of the tip-side portion 322 of the guide portion 32 gradually decreases from the step portion 323 in the insertion direction. With such a configuration, since the tip-side portion 322 is likely to come into contact with the string end portions 41A and 41B at multiple points, the holding force of the string end portions 41A and 41B can be improved.

[0033] In this embodiment, the plug 30 further has a pair of plate portions 34A and 34B provided on both sides in the X direction of the tip-side portion 322 of the guide portion 32, and the plate portions 34A and 34B face the string end portions 41A and 41B in the Z direction. With such a configuration, the plate portions 34A and 34B can support the string end portions 41A and 41B set on the plug 30. Thereby, it is possible to suppress the string end portions 41A and 41B from falling off the plug 30 before the plug 30 is inserted into the socket 20. Further, in this embodiment, when setting the string end portions 41A and 41B with respect to the plug 30, the string end portions 41A and 41B may be placed on the plate portions 34A and 34B, so that the setting of the string end portions 41A and 41B becomes easy.

[0034] In this embodiment, the base portion 31 includes a fitting portion 311 that fits into the second opening 27 of the socket 20, and a pair of protruding portions 312A and 312B that protrude in the Y direction from the fitting portion 311 and face the string end portions 41A and 41B in the Y direction. On at least one side in the Z direction with respect to the protruding portions 312A and 312B, base-side stepped portions 313A and 313B are formed by the fitting portion 311 and the protruding portions 312A and 312B. According to such a configuration, a gap space for accommodating the fraying of the string end portions 41A and 41B is formed between the base-side stepped portions 313A and 313B of the plug 30 and the socket 20. When there is fraying in the string end portions 41A and 41B, the fraying is accommodated in the gap space, so that it is suppressed from being caught between the socket 20 and the plug 30, and the plug 30 can be surely inserted into the socket 20.

[0035] In this embodiment, it is preferable that the dimension W1 in the X direction of the base-end side portion 321 is in the range of 1 / 4 to 1 / 2 with respect to the dimension W2 in the X direction of the portion adjacent to the base-end side portion 321 in the tip-side portion 322. Also, in this embodiment, it is preferable that the dimension D1 in the Y direction of the base-end side portion 321 is in the range of 1 / 5 to 1 / 2 with respect to the dimension D2 in the Y direction of the guide portion 32. With such a configuration, it is possible to suitably achieve both the holding of the string end portions 41A and 41B and the formation of the terminal accommodation spaces 350A and 350B of the plug 30.

[0036] (Modification example) In the above embodiment, the base-side stepped portions 313A and 313B are formed on both sides in the Z direction with respect to the protruding portions 312A and 312B, but the base-side stepped portions 313A and 313B may be formed on either one side in the Z direction with respect to the protruding portions 312A and 312B. Further, the base portion 31 may not have the protruding portions 312A and 312B, and the base-side stepped portions 313A and 313B may not be formed.

[0037] In the above embodiment, the plug 30 has a pair of plate portions 34A and 34B, but the present invention is not limited to this, and the plug 30 may not have a pair of plate portions 34A and 34B.

[0038] In the above embodiment, the dimension of the tip-side portion 322 of the guide portion 32 in the X direction gradually decreases from the step portion 323 toward the Y direction, but the present invention is not limited to this, and the shape of the tip-side portion 322 can be arbitrarily changed.

[0039] In the above embodiment, the plug 30 has a pair of leg portions 33A and 33B, but the present invention is not limited to this, and the plug 30 may not have a pair of leg portions 33A and 33B. For example, the guide portion 32 of the plug 30 may sandwich the string end portions 41A and 41B not between the leg portions 33A and 33B but between the side wall portions 23 and 24 of the socket 20. In this case, a string arrangement space in which the string end portions 41A and 41B are arranged is formed between the base end side portion 321 of the guide portion 32 and the side wall portions 23 and 24 of the socket 20. The string arrangement space includes an end accommodation space that is widely secured in the X direction by the step portion 323, as in the above embodiment.

[0040] In the above embodiment, both ends of one string 4 are described as the string end portions 41A and 41B, but the string end portions 41A and 41B may be ends of different strings.

Description of Reference Numerals

[0041] 10…Code end, 20…Socket, 21…Upper wall portion, 211…Rail portion, 212…Hole portion, 22…Lower wall portion, 221…Rail portion, 222…Hole portion, 23, 24…Side wall portions, 25…Accommodation space, 26…First opening, 27…Second opening, 30…Plug, 31…Base portion, 311…Fitting portion, 312A, 312B…Protrusions, 313…Convex portion, 313A, 313B…Base side step portions, 32…Guide portion, 320A, 320B…Side surfaces, 321…Base end side portion, 322…Tip end side portion, 323…Step portion, 324…Groove portion, 325…Guide groove, 331…Claw portion, 33A, 33B…Leg portions, 34A, 34B…Plate portions, 35A, 35B…String arrangement spaces, 350A, 350B…Terminal accommodation spaces, 40…String, 411…Terminal portion, 412…Intermediate portion, 41A, 41B…String end portions.

Claims

1. A cylindrical socket (20) in which a first opening (26) and a second opening (27) are formed, and two string end portions (41A, 41B) are inserted into the first opening (26); A plug (30) inserted into the second opening (27) of the socket (20), The plug (30) has a base portion (31) and a guide portion (32) that extends from the base portion (31) along the insertion direction of the plug (30) and is disposed between the two string end portions (41A, 41B). The guide portion (32) includes a proximal end side portion (321) connected to the base portion (31), and a distal end side portion that is a portion on the distal end side of the proximal end side portion (321) and has a dimension larger than that of the proximal end side portion (321) in the width direction in which the two string end portions (41A, 41B) are arranged in parallel. On each side surface (320A, 320B) of the guide portion (32) facing the string end portions (41A, 41B) in the width direction, a step portion (323) is formed by the proximal end side portion (321) and the distal end side portion (322). The plug (30) further has a pair of leg portions (33A, 33B) that extend from the base portion (31) along the insertion direction on both sides in the width direction with respect to the guide portion (32). The leg portions (33A, 33B) are cord ends that are elastically deformable so as to sandwich the string end portions (41A, 41B) between the guide portion (32).

2. A cylindrical socket (20) in which a first opening (26) and a second opening (27) are formed, and two string end portions (41A, 41B) are inserted into the first opening (26); A plug (30) inserted into the second opening (27) of the socket (20), The plug (30) has a base portion (31) and a guide portion (32) that extends from the base portion (31) along the insertion direction of the plug (30) and is disposed between the two string end portions (41A, 41B). The guide portion (32) includes a proximal end portion (321) connected to the base portion (31), and a distal end portion that is located on the distal end side of the proximal end portion (321) and has a larger dimension than the proximal end portion (321) in the width direction in which the two string end portions (41A, 41B) are arranged in parallel. On each side surface (320A, 320B) of the guide portion (32) facing the string end portions (41A, 41B) in the width direction, a stepped portion (323) is formed by the proximal end portion (321) and the distal end portion (322). The base portion (31) includes a fitting portion (311) that fits into the second opening (27) of the socket (20), and a pair of protruding portions (312A, 312B) that protrude from the fitting portion (311) in the insertion direction and face the two string end portions (41A, 41B) in the insertion direction. On at least one side of the protruding portions (312A, 312B) in the thickness direction that intersects each of the insertion direction and the width direction, base-side stepped portions (313A, 313B) are formed by the fitting portion (311) and the protruding portions (312A, 312B). A cord end.

3. The cord end according to claim 1 or claim 2, wherein the dimension of the distal end portion (322) in the width direction gradually decreases from the stepped portion (323) in the insertion direction.

4. The plug (30) further includes a pair of plate portions (34A, 34B) provided on both sides of the distal end portion (322) in the width direction. The cord end according to any one of claims 1 to 3, wherein the plate portions (34A, 34B) face the string end portions (41A, 41B) in the thickness direction that intersects each of the insertion direction and the width direction.

5. The ratio of the dimension (W1) in the width direction of the proximal end side portion (321) to the dimension (W2) in the width direction of the portion adjacent to the proximal end side portion (321) in the distal end side portion (322) is in the range of 1 / 4 to 1 / 2. The code end according to any one of claims 1 to 4.

6. The ratio of the dimension (D1) in the insertion direction of the proximal end side portion (321) to the dimension (D2) in the insertion direction of the guide portion (32) is in the range of 1 / 5 to 1 / 2. The code end according to any one of claims 1 to 5.

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