Lower plug for vibrating tubular body

Abstract

To provide a lower plug for shake-type tubular bodies capable of protecting a rear end of a small-diameter tube, highly efficiently draining water and being easily manufactured.SOLUTION: A lower plug 20 for shake-type tubular bodies to be mounted on a rear end of a shake-type tubular body 10 for storing small-diameter tubes (10B, 10C and 10D) in a parent tube 10A, comprises a large diameter tube 30 integrally formed of an elastically deformable material, exposed to a rear end of the parent tube 10A, formed into a large diameter larger than the inside diameter of the parent tube 10A, and having a drain hole 34 communicated to the outside, a small diameter part 40 connected to the large diameter part 30, formed into a small diameter smaller than the large diameter part 30 and fitted in an inner peripheral surface of the rear end of the parent diameter 10A, a small diameter tube receiving part 50 elastically deformably formed on the small diameter part 40 and when being stored, receiving the rear end of the small diameter tube, and a drainage flow passage L communicating from the small diameter part 40 to the drain hole 34 of the large diameter part 30.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a bottom plug for a telescopic tubular body. [Background technology]

[0002] A bottom plug is provided at the rear end of a telescopic tubular body such as a fishing rod or a fishing net. For example, the bottom plug for a telescopic tubular body described in Patent Document 1 has a discharge function that allows it to discharge foreign matter such as moisture, dirt, and sand when they adhere to the inside of the telescopic tubular body. In addition, the bottom plug for a telescopic tubular body has a rod receiving section that receives small diameter tubes (middle rod tube, tip rod tube) that are sequentially stored in the main tube. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-70386 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional bottom plugs for telescopic tubular bodies have an elastic member (such as a rubber sheet) attached to protect the rear end of the small diameter tube when it is stored. In order to attach a rubber sheet or the like to the rod holder of the bottom plug for telescopic tubular bodies, a large adhesive surface is required on the rod holder. With this configuration, the drainage hole in the bottom plug for telescopic tubular bodies cannot be made large, which causes the problem that water tends to accumulate inside the telescopic tubular body, causing dirt and deterioration of the adhesive parts. In addition, if the bottom plug for telescopic tubular bodies is made up of multiple parts, the number of parts increases and the manufacturing process becomes complicated.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a bottom plug for a telescopic tubular body that protects the rear end of a small diameter pipe, allows efficient drainage, and is easy to manufacture. [Means for solving the problem]

[0006] The present invention provides a bottom plug for a telescopic tubular body that is attached to the rear end of a telescopic tubular body that stores a small diameter pipe in an original pipe, the bottom plug being integrally formed from an elastically deformable material and comprising: a large diameter portion that is exposed at the rear end of the original pipe, is formed to have a diameter larger than the inner diameter of the original pipe, and is equipped with a drain hole that communicates with the outside; a small diameter portion that is continuous with the large diameter portion, is formed to have a diameter smaller than the large diameter portion, and is fitted to the inner peripheral surface of the rear end of the original pipe; a small diameter pipe receiving portion that is elastically deformable on the small diameter portion and receives the rear end of the small diameter pipe when stored; and a drainage flow path that communicates from the small diameter portion to the drain hole of the large diameter portion. The small diameter pipe receiving portion includes a shaft portion extending from the large diameter portion side to the small diameter portion side, and a plurality of protruding plate portions extending radially outward from the shaft portion, and the drainage flow path is formed inside the shaft portion along the extension direction. It is characterized by the fact that

[0007] According to the present invention, the small diameter pipe receiving portion is formed to be elastically deformable, so that the rear end of the small diameter pipe can be protected when it is stored. In addition, since it is provided with a drainage flow path that communicates from the small diameter portion to the drainage hole of the large diameter portion, water and the like that has accumulated in the telescopic tubular body can be efficiently drained. In addition, since it is formed as one piece, it can be easily manufactured. Furthermore, the small diameter pipe receiving portion can be easily constructed.

[0010] It is also preferable that the protruding plate portion comprises a lower plate portion extending radially outward from the shaft portion, an upper plate portion arranged on the opposite side of the lower plate portion from the large diameter portion, and a folded portion connecting the lower plate portion and the upper plate portion.

[0011] According to the present invention, the elasticity of the small diameter pipe receiving portion can be increased with a simple structure.

[0012] Also, The present invention provides a bottom plug for a telescopic tubular body that is attached to the rear end of a telescopic tubular body that stores a small diameter pipe in an original pipe, the bottom plug being integrally formed from an elastically deformable material and comprising: a large diameter section that is exposed at the rear end of the original pipe, is formed to have a diameter larger than the inner diameter of the original pipe, and is equipped with a drain hole that communicates with the outside; a small diameter section that is continuous with the large diameter section, is formed to have a diameter smaller than the large diameter section, and is fitted to the inner surface of the rear end of the original pipe; a small diameter pipe receiving section that is elastically deformable on the small diameter section and receives the rear end of the small diameter pipe when stored; and a drainage flow path that communicates from the small diameter section to the drain hole of the large diameter section. The small diameter pipe receiving portion is composed of a plurality of protruding plate portions protruding from the inner peripheral surface of the small diameter portion toward the axis, and the drainage flow path is connected to the drainage hole from an opening provided at the tip side of the plurality of protruding plate portions. Characterized by .

[0013] According to the present invention, the small diameter pipe receiving portion can be easily configured.

[0014] It is also preferable that the plurality of protruding plate portions are inclined in a direction away from the large diameter portion toward the tip end side.

[0015] According to the present invention, the durability of the small diameter pipe receiving portion can be improved.

[0016] Also, The present invention provides a bottom plug for a telescopic tubular body that is attached to the rear end of a telescopic tubular body that stores a small diameter pipe in an original pipe, the bottom plug being integrally formed from an elastically deformable material and comprising: a large diameter section that is exposed at the rear end of the original pipe, is formed to have a diameter larger than the inner diameter of the original pipe, and is equipped with a drain hole that communicates with the outside; a small diameter section that is continuous with the large diameter section, is formed to have a diameter smaller than the large diameter section, and is fitted to the inner surface of the rear end of the original pipe; a small diameter pipe receiving section that is elastically deformable on the small diameter section and receives the rear end of the small diameter pipe when stored; and a drainage flow path that communicates from the small diameter section to the drain hole of the large diameter section. The small diameter pipe receiving portion has a plurality of protruding plate portions that rise obliquely from an end face of the small diameter portion toward the tip end of the original pipe, and the drainage flow path has a through hole that communicates from the end face to the drainage hole. Characterized by .

[0017] According to the present invention, the small diameter pipe receiving portion can be easily configured. Effect of the Invention

[0018] The bottom plug for a telescopic tubular body according to the present invention protects the rear end of a small diameter pipe, allows efficient drainage, and is easy to manufacture. [Brief description of the drawings]

[0019] [Figure 1] 1 is a side view showing a fishing rod to which a bottom plug according to an embodiment of the present invention is attached. [Diagram 2] FIG. 2 is a perspective view showing a bottom plug according to the first embodiment. [Diagram 3] FIG. 2 is a cross-sectional view showing the bottom plug according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a bottom plug according to a second embodiment. [Diagram 5] FIG. 11 is a perspective view showing a bottom plug according to a third embodiment. [Figure 6] FIG. 11 is a cross-sectional view showing a bottom plug according to a third embodiment. [Figure 7] FIG. 13 is a perspective view showing a bottom plug according to a fourth embodiment. [Figure 8] FIG. 13 is a plan view showing a bottom plug according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First Embodiment Hereinafter, a first embodiment of the bottom plug for a telescopic tubular body (hereinafter, simply referred to as a "bottom plug") of the present invention will be described with reference to the attached drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions will be omitted as appropriate. In addition, the configuration of each embodiment can be applied in appropriate combination with other embodiments.

[0021] As shown in FIG. 1, the fishing rod 1 of this embodiment includes a telescopic tubular body 10 and a bottom plug 20. The telescopic tubular body 10 is a telescopic tubular body including a base tube 10A, a middle tube (small diameter tube) 10B, a tip tube (small diameter tube) 10C, and a tip (small diameter tube) 10D. The bottom plug 20 is attached to the rear end of the base tube 10A. The base tube 10A, the middle tube 10B, the tip tube 10C, and the tip 10D are all cylindrical and made of, for example, fiber-reinforced resin. The number of small diameter tubes may be any number as long as it is one or more. The telescopic tubular body 10 of this embodiment will be described using a fishing rod as an example, but is not limited thereto, and may be, for example, a telescopic tubular body such as a fishing rod handle.

[0022] 2 and 3, the bottom plug 20 of this embodiment includes a large diameter portion 30, a small diameter portion 40, a small diameter pipe receiving portion 50, and a drainage flow path L. In the bottom plug 20 of this embodiment, the large diameter portion 30, the small diameter portion 40, and the small diameter pipe receiving portion 50 are integrally formed from an elastically deformable resin or the like. The bottom plug 20 of this embodiment can be formed using, for example, a 3D printer.

[0023] 3, large diameter portion 30 is a portion exposed to the outside when bottom plug 20 is attached to the rear end of original pipe 10A, and is formed with a diameter larger than the inner diameter of original pipe 10A. Large diameter portion 30 includes large diameter portion main body 31, receiving portion 32, large diameter end portion 33, drainage hole 34, and large diameter bottom portion 35.

[0024] The large diameter portion main body 31 has a generally cylindrical shape, with the small diameter portion 40 formed continuously on the original pipe 10A side and the opposite side closed by the large diameter end portion 33. The outer peripheral surface of the large diameter portion main body 31 may be provided with a design, irregularities, etc. The receiving portion 32 is a step that protrudes vertically radially outward from the base end of the small diameter portion 40. The receiving portion 32 is the portion against which the base end of the original pipe 10A abuts. The outer diameter of the receiving portion 32 is generally the same as the outer diameter of the original pipe 10A.

[0025] A drain hole 34 that communicates with the outside is formed in the center of the large diameter end 33. The large diameter end 33 in this embodiment has a flat surface, but is not limited to this. For example, it may be rounded so as to bulge in the direction away from the original pipe 10A. The large diameter bottom 35 is inclined downward from the radially outer direction to the radially inner direction, forming a mortar shape.

[0026] The small diameter portion 40 is formed continuously with the large diameter portion 30, and is fitted to the inner peripheral surface of the original pipe 10A. The small diameter portion 40 has a cylindrical shape, and the outer diameter of the small diameter portion 40 is smaller than the outer diameter of the large diameter portion 30. The small diameter portion 40 has a hollow tubular portion 41 and an opening portion 42 that opens to the original pipe 10A side. The outer peripheral surface of the tubular portion 41 is provided with a plurality of fine grooves (unevenness). This makes it possible to reduce the resistance to press-fitting into the original pipe 10A.

[0027] 1 to 3, the small diameter tube receiving portion 50 is a portion that receives the rear end edges of the small diameter tubes (the middle tube 10B, the tip tube 10C, and the tip 10D) that are successively housed in the base tube 10A. The small diameter tube receiving portion 50 includes a shaft portion 51 and a plurality of protruding plate portions 52.

[0028] As shown in Fig. 3, the shaft portion 51 is a columnar portion extending from the large diameter bottom portion 35 of the large diameter portion 30 toward the small diameter portion 40. The shaft portion 51 is divided into parts, and is formed to match the number of the protruding plate portions 52. In this embodiment, the protruding plate portions 52 are composed of eight pieces, so the shaft portion 51 is divided into eight parts of the same shape. A through hole is formed inside the shaft portion 51, which penetrates in the extension direction and communicates with the drainage hole 34.

[0029] The protruding plate portion 52 protrudes radially outward from the shaft portion 51 and has a generally triangular shape in plan view. A plurality of protruding plate portions 52 are formed on the inner circumference of the small diameter portion 40, and adjacent protruding plate portions 52 are separated by a gap S. Small diameter pipe receiving portion drainage holes 54 are formed on the tip sides of the plurality of protruding plate portions 52. The small diameter pipe receiving portion drainage holes 54 and the through hole of the shaft portion 51 form a drainage flow path L. The drainage flow path L communicates with the drainage hole 34.

[0030] The protruding plate portion 52 includes a lower plate portion 52a that protrudes radially outward from the shaft portion 51, an upper plate portion 52b that is disposed on the opposite side of the large diameter portion 30 with respect to the lower plate portion 52a, and a folded portion 52c that connects the lower plate portion 52a and the upper plate portion 52b. The lower plate portion 52a and the upper plate portion 52b are both plate-shaped portions that face each other with a small gap in the vertical direction. The upper surface of the upper plate portion 52b is inclined slightly downward as it moves away from the axis O. The folded portion 52c is separated from the inner peripheral surface of the small diameter portion 40 with a small gap S1. Although the protruding plate portion 52 has a folded structure, it may have a single plate-shaped structure without being folded.

[0031] The water that flows into the drainage flow path L is discharged to the outside through the drainage hole 34. The water on the upper plate portion 52b flows down from the gap S or the gap S1 to the inner circumferential surface of the small diameter portion 40, the shaft portion 51 or the large diameter bottom portion 35, and is discharged to the outside through the drainage hole 34 via a communication passage (not shown) provided in the shaft portion 51.

[0032] According to the bottom plug 20 of the present embodiment described above, since the small diameter tube receiving portion 50 is formed to be elastically deformable, the rear end of the small diameter tube (middle tube 10B, tip tube 10C, and tip 10D) can be protected when stored. In addition, since the drainage flow path L that communicates from the small diameter portion 40 to the drainage hole 34 of the large diameter portion 30 is provided, water and the like that has accumulated in the telescopic tubular body can be efficiently discharged. In addition, since the small diameter tube receiving portion 50 is formed with the gaps S, S1 and the small diameter tube receiving portion drainage hole 54, the structure is such that water can be easily guided to the drainage flow path L, and the drainage efficiency can be improved. In addition, since the bottom plug 20 is integrally formed, it can be easily manufactured.

[0033] The small diameter pipe receiving portion 50 also includes a shaft portion 51 extending from the large diameter portion 30 side to the small diameter portion 40 side, and a plurality of protruding plate portions 52 extending radially outward from the shaft portion 51. This allows the small diameter pipe receiving portion 50 to be easily configured. Since the shaft portion 51 is provided with a drainage flow passage L formed inside along the extension direction, water in the telescopic tubular body 10 can flow along the protruding plate portions 52 into the drainage flow passage L and be discharged to the outside through the drainage hole 34. Since the large diameter bottom portion 35 also has a downward slope (cone-shaped), water can be easily guided to the drainage hole 34.

[0034] In addition, the protruding plate portion 52 includes a lower plate portion 52a, an upper plate portion 52b, and a folded portion 52c that connects the lower plate portion 52a and the upper plate portion 52b. This increases the elasticity of the protruding plate portion 52, and the gap between the lower plate portion 52a and the upper plate portion 52b can absorb the impact with the small diameter pipe. In addition, the inside of the bottom plug 20 is hollow, which can reduce the weight.

[0035] Second Embodiment Next, a bottom plug according to a second embodiment of the present invention will be described. As shown in Fig. 4, in the second embodiment, the configuration of the small diameter pipe receiving portion 50B is different from that of the first embodiment. In the bottom plug 20B according to the second embodiment, the differences from the first embodiment will be mainly described.

[0036] The protruding plate portion 52B of the small diameter pipe receiving portion 50B in this embodiment is formed in four consecutive stages in the height direction. The protruding plate portion 52B includes a lower plate portion 52Ba, an upper plate portion 52Bb, and a folded portion 52Bc that connects the lower plate portion 52Ba and the upper plate portion 52Bb. In this embodiment, four protruding plate portions 52B (four stages) are provided for one shaft portion 51B, but the number may be three or less, or five or more.

[0037] The bottom plug 20B described above can achieve substantially the same effects as those of the first embodiment. In addition, by increasing the number of the protruding plate portions 52B in the height direction, the elasticity of the small diameter pipe receiving portion 50B can be further increased.

[0038] <Third embodiment> Next, a bottom plug according to a third embodiment of the present invention will be described. As shown in Figures 5 and 6, the internal structure of a bottom plug 20C according to the third embodiment differs from that of the first embodiment. The bottom plug 20C according to the third embodiment will be described mainly with respect to the differences from the first embodiment.

[0039] As shown in FIG. 6, the bottom plug 20C includes a large diameter portion 30, a small diameter portion 40, a small diameter pipe receiving portion 50C, and a drainage flow path L1. The small diameter pipe receiving portion 50C is composed of a plurality of protruding plate portions 52C that protrude from the inner peripheral surface of the small diameter portion 40 toward the axis O. Each protruding plate portion 52C has a substantially triangular shape, and the tip side is a free end. The protruding plate portion 52C is inclined toward the front end side (the side away from the large diameter portion 30) as it approaches the tip. Adjacent protruding plate portions 52C are separated by a gap S2. A substantially circular protruding plate opening (opening) 54C is formed on the tip side of the plurality of protruding plate portions 52C.

[0040] As shown in FIG. 6, an inclined portion 51C is formed inside the large diameter portion 30 and the small diameter portion 40. The inclined portion 51C is composed of a first inclined portion 51Ca and a second inclined portion 51Cb. The first inclined portion 51Ca is cylindrical, the rear end of which is connected to the drain hole 34, and the front end of which is open to the front end side. The first inclined portion 51Ca is inclined so as to decrease in diameter toward the rear end. The second inclined portion 51Cb is inclined to connect the front end of the first inclined portion 51Ca and the inner circumferential surface of the small diameter portion 40. The second inclined portion 51Cb is inclined so as to decrease in diameter toward the rear end. The inclination angle of the second inclined portion 51Cb is gentler than the inclination angle of the first inclined portion 51Ca. A cylindrical reinforcing portion 53C is formed inside the large diameter portion 30 and the small diameter portion 40, connecting the second inclined portion 51Cb and the large diameter bottom portion 35.

[0041] A drainage flow path L1 is formed by the protruding plate opening (opening) 54C and the inclined portion 51C. Water that flows into the drainage flow path L1 is discharged to the outside through the drainage hole 34. In addition, water on the protruding plate portion 52C flows down from the gap S2 along the inclined portion 51C and is discharged from the drainage hole 34.

[0042] The bottom plug 20C described above can achieve substantially the same effects as the first embodiment. In addition, the small diameter pipe receiving portion 50C can be easily configured by configuring the multiple protruding plate portions 52C to extend from the inner peripheral surface of the small diameter portion 40 toward the axis O. In addition, the drainage efficiency can be improved by providing the drainage flow path L1.

[0043] In addition, when the small diameter tube is not stored, the protruding plate portion 52C is inclined in a direction away from the large diameter portion 30 toward the tip side, thereby improving durability. Furthermore, since the reinforcing portion 53C is provided, the strength of the bottom plug 20C can be increased.

[0044] In the third embodiment, the small diameter pipe receiving portion 50C is configured with a plurality of protruding plate portions, but the small diameter pipe receiving portion 50C may be configured with a single protruding plate portion. In addition, the protruding plate portion 52C may be formed so as to be perpendicular to the axis O.

[0045] <Fourth embodiment> Next, a bottom plug according to a fourth embodiment of the present invention will be described. As shown in Figures 7 and 8, in the fourth embodiment, the configuration of a small diameter tube receiving portion 50D is different from that of the first embodiment. In the bottom plug 20D according to the fourth embodiment, the differences from the first embodiment will be mainly described.

[0046] As shown in Fig. 7, the small diameter pipe receiving portion 50D includes an end surface 51D, a protruding plate portion 52D, and a through hole 54D. The end surface 51D is formed so as to cover the front end of the small diameter portion 40. A through hole 54D is formed in the center of the end surface 51D and communicates with the drain hole 34 (see Fig. 3) of the large diameter portion 30. The end surface 51D in this embodiment is a flat surface, but may be an inclined surface that slopes downward toward the through hole 54D.

[0047] The protruding plate portion 52D is formed to rise obliquely upward from the end surface 51D toward the tip of the original pipe 10A. In other words, the base end of the protruding plate portion 52D is continuous with the end surface 51D, and the tip of the protruding plate portion 52D is a free end. The protruding plate portions 52D have the same shape and are arranged in the same direction, offset from each other by 90 degrees. In this embodiment, the number of the protruding plate portions 52D is four, but it may be set to two or more as appropriate.

[0048] The fourth embodiment described above can also achieve substantially the same effects as the first embodiment. When the rear end of the small diameter pipe abuts against each of the protruding plate portions 52D, the protruding plate portions 52D bend substantially uniformly, and can absorb the impact.

[0049] The above describes the embodiment of the present invention. The present invention is not limited to the above embodiment, and each component can be modified as appropriate without departing from the spirit of the present invention. For example, the protruding plate may be provided with a drainage hole or groove, and water may be guided from the hole or groove to a drainage flow path. Also, a rib may be provided to reinforce the protruding plate. [Explanation of symbols]

[0050] 1 fishing rod 10 Telescopic tubular body 20 Bottom Plug 30 Large diameter section 40 Small diameter section 50 Small diameter pipe receiving part 51 Shaft 52 Projecting plate L Drainage channel

Claims

1. A bottom plug for a telescopic tubular body, which is attached to the rear end of a telescopic tubular body that stores a small diameter tube in a main tube, It is integrally formed of an elastically deformable material, a large diameter portion exposed at a rear end of the original pipe, formed to have a diameter larger than an inner diameter of the original pipe, and equipped with a drain hole communicating with the outside; a small diameter portion that is continuous with the large diameter portion, has a smaller diameter than the large diameter portion, and is fitted into an inner circumferential surface of the rear end of the base pipe; a small diameter pipe receiving portion formed in the small diameter portion so as to be elastically deformable and receiving a rear end of the small diameter pipe when the small diameter pipe is stored; A drainage flow path communicating from the small diameter portion to the drainage hole of the large diameter portion, The small diameter pipe receiving portion is A shaft portion extending from the large diameter portion side to the small diameter portion side; A plurality of protruding plate portions protruding radially outward from the shaft portion, The bottom plug for a telescopic tubular body is characterized in that the drainage flow path is formed inside the shaft portion along the extension direction.

2. The bottom plug for a telescopic tubular body as described in claim 1, characterized in that the protruding plate portion comprises a lower plate portion extending radially outward from the shaft portion, an upper plate portion arranged on the opposite side of the lower plate portion from the large diameter portion, and a folded portion connecting the lower plate portion and the upper plate portion.

3. A bottom plug for a telescopic tubular body, which is attached to the rear end of a telescopic tubular body that stores a small diameter tube in a main tube, It is integrally formed of an elastically deformable material, a large diameter portion exposed at a rear end of the original pipe, formed to have a diameter larger than an inner diameter of the original pipe, and equipped with a drain hole communicating with the outside; a small diameter portion that is continuous with the large diameter portion, has a smaller diameter than the large diameter portion, and is fitted into an inner circumferential surface of the rear end of the base pipe; a small diameter pipe receiving portion formed in the small diameter portion so as to be elastically deformable and receiving a rear end of the small diameter pipe when the small diameter pipe is stored; A drainage flow path communicating from the small diameter portion to the drainage hole of the large diameter portion, The small diameter pipe receiving portion is composed of a plurality of protruding plate portions extending from an inner peripheral surface of the small diameter portion toward an axis center, A bottom plug for a telescopic tubular body, characterized in that the drainage flow path communicates with the drainage hole from openings provided on the tip sides of the multiple protruding plate portions.

4. 4. The bottom plug for a telescopic tubular body according to claim 3, wherein the plurality of protruding plate portions are inclined in a direction away from the large diameter portion as they approach the tip side.

5. A bottom plug for a telescopic tubular body, which is attached to the rear end of a telescopic tubular body that stores a small diameter tube in a main tube, It is integrally formed of an elastically deformable material, a large diameter portion exposed at a rear end of the original pipe, formed to have a diameter larger than an inner diameter of the original pipe, and equipped with a drain hole communicating with the outside; a small diameter portion that is continuous with the large diameter portion, has a smaller diameter than the large diameter portion, and is fitted into an inner circumferential surface of the rear end of the base pipe; a small diameter pipe receiving portion formed in the small diameter portion so as to be elastically deformable and receiving a rear end of the small diameter pipe when the small diameter pipe is stored; A drainage flow path communicating from the small diameter portion to the drainage hole of the large diameter portion, the small diameter pipe receiving portion includes a plurality of protruding plate portions rising obliquely from an end face of the small diameter portion toward a tip end of the base pipe, A bottom plug for a telescopic tubular body, characterized in that the drainage flow path has a through hole that communicates from the end face to the drainage hole.

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