Extraction tube and net or fishing rod

Abstract

This utility model provides a pull-out tubular body and a landing net or fishing rod. Specifically, the pull-out tubular body has: a large-diameter section (10) with an inner step portion (11) on the inner surface of the top end; and a small-diameter section (20) with an outer step portion (21) on the outer surface of the tail end that abuts against the inner step portion (11) of the large-diameter section (10), and the pull-out tubular body has a joining structure (A) for sequentially pulling out and joining the small-diameter section (20) to the large-diameter section (10). On the inner surface (10A) of the large-diameter section (10) that is further to the tail side than the inner step portion (11), a flat portion (10a) is formed that presses into and fits against the outer surface (20A) of the small-diameter section (20) that is further to the tail side than the outer step portion (21) when the small-diameter section (20) is pulled out from the large-diameter section (10).

Description

Technical Field

[0001] This utility model relates to a pull-out tubular body with features in the joint structure of a large-diameter section and a small-diameter section, and a landing net or fishing rod having the pull-out tubular body. Background Technology

[0002] Landing nets with a pull-out tubular section (also called a segment) are mainly used in breakwater fishing, coastal fishing, and other fishing locations where the distance from the angler to the sea is relatively long, to retrieve a fish. In such fishing locations, due to the long distance from the sea to the fish, there is a possibility that the fish may escape the hook, so a landing net is used to retrieve it. Typically, the fish is retrieved by using one hand to operate the fishing rod to pull the fish nearby, while the other hand holds the tail section of the landing net, and the pull-out sections are lowered into the sea one by one, and the fish is retrieved using the net attached to the top.

[0003] On the handle of the aforementioned landing net, joint structures are provided on adjacent sections. For example, Patent Document 1 discloses a joint structure for the handle of a landing net, in which an inward contact portion is formed on the inner circumferential surface of the top side of the large-diameter section, and an outward contact portion is formed on the outer circumferential surface of the tail side of the small-diameter section. On the top side of the large-diameter section, a rearward abutting surface with a diameter larger than the inner diameter of the top side is formed, and on the tail side of the small-diameter section, a forward abutting surface with a diameter larger than the outer diameter of the outer side is formed. Thus, by the abutting surfaces abutting against each other, the elongation action can be stopped, and the adhesion between the two can be suppressed.

[0004] Patent documents Patent Document 1: Japanese Utility Model Registration No. 2535540 Utility Model Content

[0005] The existing joint structure described above has the potential to cause a small-diameter section to become firmly attached to the larger-diameter section by having its forward abutment surface pass over the rearward abutment surface of the larger-diameter section when subjected to a large impact that causes the sections to fall vertically. To prevent this firm attachment, increasing the diameter of the abutment surfaces would result in an overall increase in the diameter and weight of the sections.

[0006] The technical problem to be solved by this utility model is to provide a pull-out tubular structure that does not produce a strong fixation phenomenon on the joint structure of adjacent sections and can achieve overall lightweight design for landing nets or fishing rods equipped with such pull-out tubular structure.

[0007] The present invention relates to a pull-out tubular body comprising: a diameter section having an inner stepped portion on the inner surface of the top end; and a small diameter section having an outer stepped portion on the outer surface of the tail end that abuts against the inner stepped portion of the large diameter section, and having a joining structure for sequentially pulling out the small diameter section to the large diameter section, characterized in that a planar portion is formed on the inner surface of the large diameter section further to the tail end than the inner stepped portion, which presses into and engages with the outer surface of the small diameter section further to the tail end than the outer stepped portion when the small diameter section is pulled out from the large diameter section.

[0008] When the pull-out tubular body constructed as described above is pulled out from the large-diameter section, in the stage before the inner stepped portion of the large-diameter section abuts against the outer stepped portion of the small-diameter section, the outer surface of the small-diameter section can be pressed and fitted into the flat portion of the large-diameter section. Therefore, the impact of the contact between the inner stepped portion of the large-diameter section and the outer stepped portion of the small-diameter section can be mitigated. Thus, even if the diameter difference between the inner stepped portion and the outer stepped portion of the small-diameter section is small, it is possible to effectively suppress the meshing of the two and achieve weight reduction.

[0009] Furthermore, since a flat portion is formed on the inner surface of the large-diameter section that is further to the tail than the inner step portion, and which is pressed into and fits the outer surface of the small-diameter section that is further to the tail than the outer step portion, circumferential rotation and loosening can be suppressed.

[0010] Furthermore, since this utility model is a landing net or fishing rod with the above-mentioned pull-out tubular body, even if each section is pulled out and dropped, as described above, the impact on the joint can be mitigated, so that biting will not occur at the joint and lightweighting can be achieved. Moreover, since rotation or loosening can be suppressed during operation, operability can be improved. Attached Figure Description

[0011] Figure 1 This is a diagram illustrating one embodiment of a net with a retractable tubular body. Figure 2 It is Figure 1 The diagram shows an enlarged representation of the connection structure between the large-diameter and small-diameter sections of the pull-out tubular structure. Figure 3 It is a cross-sectional view showing the fit between the large-diameter section and the small-diameter section. Symbol Explanation 1-Retractable tubular body; 10-Large diameter section; 10A-Inner surface; 10a-Flat surface; 11-Inner stepped section; 20-Small diameter section; 20A-Outer surface; 21-Outer stepped section; A-Joint structure. Detailed Implementation

[0012] The following describes one embodiment of the pull-out tubular body and the net equipped with the pull-out tubular body.

[0013] Figure 1 This diagram illustrates an example of a net. The pull-out tubular structure 1 comprises middle sections 20, 30, and 40, and a top section 50, which are sequentially pulled out of the tail section 10. A net 70 is mounted on the top of the smallest diameter section, the top section 50. Currently, in the relationship between the tail section 10 and the middle section 20, the tail section 10 is the larger diameter section, and the middle section 20 is the smaller diameter section. Furthermore, in the relationship between the middle sections 20 and 30, the middle section 20 is the larger diameter section, and the middle section 30 is the smaller diameter section; in the relationship between the middle sections 30 and 40, the middle section 30 is the larger diameter section, and the middle section 40 is the smaller diameter section; and in the relationship between the middle section 40 and the top section 50, the middle section 40 is the larger diameter section, and the top section 50 is the smaller diameter section. Moreover, a joining structure A is provided between each section to connect the two sections when the smaller diameter section is pulled out from the larger diameter section.

[0014] Furthermore, while there is no limitation on the number of segments, in this embodiment, it consists of five segments: three middle segments 20, 30, and 40 housed in the tail segment 10, and one top segment 50 housed in the middle segment 40. Additionally, the lengths of each segment 20, 30, 40, and 50 can be configured to be approximately the same as the tail segment 10. Furthermore, the net 70 can be either fixed to the top segment 50 or detachable. Therefore, the pull-out tubular body 1 can be manufactured and sold separately as the handle of the landing net.

[0015] The aforementioned sections 10, 20, 30, 40, and 50 are tubular bodies made of fiber-reinforced resin. For example, a fiber-reinforced resin prepreg film impregnated with a thermosetting synthetic resin such as epoxy resin in reinforcing fibers (mainly carbon fiber or glass fiber) is wound onto a mandrel, and after a heating process, core removal is performed, etc., and the tubes are formed into tubular shapes of specified dimensions according to conventional methods. Alternatively, each section can be configured as a tapered shape that narrows towards the top side (mesh side), or it can be configured as a straight shape.

[0016] In the joint area between the segments, a joint structure A is provided to join the two segments in a pull-out manner. The joint structure A has the function of preventing the small diameter segment from coming off the large diameter segment when the small diameter segment is pulled out from the large diameter segment, and suppressing the loosening of the small diameter segment. The following describes the joint structure A between the tail section (large diameter section) 10 and the middle section (small diameter section) 20.

[0017] Figure 2 This is an enlarged view of the joint structure A. Figure 3 This is a cross-sectional view showing the joint state of the large-diameter section 10 and the small-diameter section 20. The joint structure A includes: an inner step portion 11, formed on the inner surface of the top end of the large diameter section 10; and an outer step portion 21, formed on the outer surface of the tail end of the small diameter section 20, in such a way as to abut against the inner step portion 11 of the large diameter section 10.

[0018] The inner step portion 11 is formed as a flange with a predetermined length L1 in the axial direction and protruding toward the axis. Furthermore, the outer step portion 21 is formed as a circumferential step portion by performing centerless machining or similar processes on the end region of the tail side of the small-diameter section 20. These inner and outer step portions 11 are formed such that when the small-diameter section 20 is pulled out (extruded) from the large-diameter section 10, the axial contact surface 21a of the outer step portion 21 abuts against the axial contact surface 11a of the inner step portion 11, thus preventing disengagement. In addition, there is no special restriction on the axial length L1 of the inner step portion 11, but it is only about 10mm to 20mm.

[0019] Furthermore, on the inner surface 10A of the large-diameter section 10, which is further to the tail than the inner step portion 11, a flat portion 10a of a predetermined length L2 is formed along the axial direction. This allows it to press and engage with the outer surface 20A of the small-diameter section 20, which is further to the tail than the outer step portion 21, when the small-diameter section 20 is pulled out from the large-diameter section 10. The axial length L2 of this flat portion 10a is not particularly limited, but it is acceptable to have a length of approximately 35 mm to 55 mm.

[0020] According to the above configuration, when the large-diameter section 10 is pulled out from the small-diameter section 20, in the initial stage before the inner step portion 11 of the large-diameter section 10 abuts against the outer step portion 21 of the small-diameter section 20, the outer surface 20A of the small-diameter section 20 can be pressed into and fitted with the flat surface portion 10a of the large-diameter section 10, thereby mitigating the impact of the contact between the inner step portion 11 of the large-diameter section 10 and the outer step portion 21 of the small-diameter section 20. In particular, in structures where sections fall vertically like a landing net, there is a significant impact on the joint structure portion, but by employing the above-described joint structure A, the impact when stopping at the joint structure portion can be mitigated. Furthermore, since the outer surface of the small-diameter section 20, which is further from the outer step portion 21, is pressed into and fitted with the flat surface portion 10a of the large-diameter section 10, circumferential rotation and loosening can be suppressed.

[0021] Furthermore, through the aforementioned shock-absorbing function, even if the diameter difference between the outer step portion 21 and the outer step portion 21 of the small diameter section 20 is made small, the outer 20a, which is further to the tail side than the outer step portion 21, will not ride on the inner step portion 11 and engage, thus achieving weight reduction.

[0022] Specifically, when the diameter difference between the inner step portion 11 and the outer step portion 21 (the difference between the wall thickness T1 of the axial contact surface 11a and the wall thickness T2 of the axial contact surface 21a) is less than 0.4 mm, there is a possibility that when the small diameter section 20 is pulled out from the large diameter section 10, the outer 20A of the small diameter section 20, which is further to the tail than the outer step portion 21, may ride on the inner step portion 11 of the large diameter section 10. Furthermore, when the diameter difference is greater than 0.6 mm, it leads to thicker walls and increased weight. Therefore, to eliminate loosening and improve operability, the diameter difference between the inner step portion 11 and the outer step portion 21 is preferably 0.4 mm to 0.6 mm.

[0023] The inner surface 10A of the large-diameter section 10 can also be formed as a straight line in the axial direction, but for the portion (within the length L2) where at least the flat portion 10a is formed, it is preferably tapered towards the top side. Furthermore, the flat portion 10a can also be formed with a uniform width in the axial direction, but it is preferably a shape in which the width increases towards the tail side. There is no particular limitation on the cone angle (tilt angle), but it is acceptable as long as it is approximately 2 / 1000 to 4 / 1000.

[0024] According to the above configuration, when the fiber-reinforced resin prepreg is wound onto the mandrel and heated to form a large-diameter section 10, when processing the planar portion corresponding to the planar portion 10a of the large-diameter section opposite to the mandrel, it is not necessary to adjust (or reduce) the radial position of the cutting tool, thus making it convenient to process using the mandrel.

[0025] like Figure 3 As shown, preferably, three or more planar portions 10a are formed on the inner surface of the large-diameter section 10 at equal intervals in the circumferential direction. Figure 3 In the middle, three planar portions 10a are formed at equal intervals in the circumferential direction, and between the planar portions 10a, there are gaps 10b extending in the axial direction.

[0026] Based on the above configuration, compared with a configuration having two or fewer planar portions 10a, regardless of the direction in which the forces acting relative to each other on the large-diameter section 10 and the small-diameter section 20 are applied, the planar portions 10a can effectively suppress the movement of the small-diameter section 20, thereby further suppressing loosening. Furthermore, since the gaps 10b are formed at equal intervals in the circumferential direction, the fixation phenomenon between the large-diameter section 10 and the small-diameter section 20 can be effectively suppressed.

[0027] Furthermore, the planar portion 10a is preferably formed to extend to the axial end face of the inner step portion 11, that is, to extend from the tail side to the axial abutment surface 11a of the inner step portion 11.

[0028] According to the above configuration, since the flat portion 10a is formed to abut the inner step portion 11 that abuts against the outer step portion 21 of the small diameter section 20, the gap between the flat portion 10a and the outer surface 20b of the small diameter section 20 on the top side of the large diameter section 10 can be eliminated, thereby further suppressing abnormal noise and loosening. Furthermore, since the flat portion is machined from the end face of the mandrel during the forming of the large diameter section 10, compared to machining from the middle of the conical surface of the mandrel, radial displacement caused by the cutting tool sliding on the conical surface can be prevented, thereby improving machining accuracy.

[0029] Furthermore, it is preferable to pre-form an inclined surface 15 that expands in diameter toward the tail side on the inner surface 10A of the large diameter section 10, on the tail side end of the flat portion 10a.

[0030] According to the above configuration, when the small diameter section 20 is pulled out from the large diameter section 10, collisions in the tail end region of the flat section 10a can be prevented, and the small diameter section 20 can be smoothly guided to the flat section 10a (so that the small diameter section is close to the axis).

[0031] Furthermore, preferably, an inclined surface 16 that gradually narrows as it transitions to the top side is also pre-formed on the top side of the small diameter section 20 (the top side of the outer step portion 21), specifically, on the top side further than the axial length L1 of the inner step portion 11.

[0032] Based on the above configuration, since the small diameter section 20 can be made smaller on the top side than the outer stepped portion 21, weight reduction can be achieved.

[0033] While the embodiments of this utility model have been described above, the utility model is not limited to the embodiments described above. For example, the joint structure A can also be a structure that is provided at any one or more locations within the joint portion of the large-diameter section and the small-diameter section of the pull-out tubular body 1. Furthermore, the number and length of the sections can be appropriately modified, and the joint structure A described above can be provided between any sections, or different joint structures can be provided depending on the location.

[0034] Furthermore, in addition to landing nets, the aforementioned pull-out tubular body can also be applied to items with pull-out structures, such as fishing rods.

Claims

1. A pull-out tubular body, comprising: The large-diameter section has an inner stepped portion on the inner surface of the top end; The smaller diameter section has an outer stepped portion on the outer side of its tail end that abuts against the inner stepped portion of the larger diameter section. It also has a joining structure that sequentially engages the smaller diameter sections with the larger diameter sections in a pull-out manner. Its features are, On the inner surface of the large-diameter section, which is further to the tail than the inner step portion, a planar portion is formed that, when the small-diameter section is pulled out from the large-diameter section, presses into and fits into the outer surface of the small-diameter section, which is further to the tail than the outer step portion.

2. The pull-out tubular body according to claim 1, characterized in that, The portion of the large-diameter section that has at least the planar portion is tapered, tapering towards the top. The planar portion has a shape that widens as it moves toward the tail side.

3. The pull-out tubular body according to claim 1, characterized in that, The planar portion is formed at equal intervals in the circumferential direction, comprising three or more of the aforementioned planar portions.

4. The pull-out tubular body according to claim 1, characterized in that, The planar portion extends to the axial abutment surface of the inner stepped portion.

5. The pull-out tubular body according to claim 1, characterized in that, On the inner surface of the large-diameter section, at the tail end of the flat portion, an inclined surface that expands in diameter toward the tail side is formed.

6. The extractable tubular body according to claim 1, characterized in that, The diameter difference between the inner stepped portion and the outer stepped portion is 0.4mm to 0.6mm.

7. A wire mesh characterized in that, It has a pull-out tubular body as described in any one of claims 1 to 6.

8. A fishing rod characterized by It has a pull-out tubular body as described in any one of claims 1 to 6.

Images