KR102571512B1 - Hairtail ship fishing rod - Google Patents

Abstract

The present invention relates to a hairtail boat fishing rod that can be directly applied to realistic boat fishing for fishermen who make hairtail fishing their main business, is easy to handle during transportation and storage, and has high durability, high strength and high elasticity, and is adjustable in length. In the hairtail boat fishing pole inserted into the pole fixing part of the fishing boat and mounted on the pole holder, a cylindrical insertion fixing part inserted into the pole fixing part and fixed, extending forward of the insertion fixing part, A cylindrical rod butt mounted on the rod holder, a cylindrical rod belly detachably extended and coupled to the front of the rod butt, and a rod tip extending and coupled to the front of the rod belly and connected to a fishing line, , Each of the insertion fixing part, the rod butt and the rod belly is made into a cylindrical tubular body by impregnating a glass fiber sheet, a carbon fiber sheet, and a polyethylene fiber sheet, respectively, into a resin, and then winding them multiple times while sequentially stacking and pressing. do.

Description

Pole for hairtail boat fishing {HAIRTAIL SHIP FISHING ROD}

The present invention relates to a rod for fishing hairtail that can be directly applied to realistic boat fishing for fishermen who make hairtail fishing their main business.

The hairtail/cutlassfish is scientifically named Trichiurus lepturus, and is a warm current fish species widely distributed in the western and southern seas of Korea, the East China Sea, the Bohai Sea, western Japan, and the coast of Kyushu. It is known that hairtail is distributed in the southwestern part of Jeju Island and the northern part of the East China Sea during the wintering period, from January to March.

In addition, along with mackerel and anchovies, it is one of the representative catches in Korea, and the catch has gradually decreased from about 160,000 tons in the 1970s to 41,049 tons in 2015 and 33,291 tons in 2016. These hairtails are nocturnal fish, staying in deep water during the day and rising to the surface at night in search of food. It has a habit of following when it sees a light, so it reacts to a fishing lamp.

Usually, fishing is done by large trawls, coastal nets, purse seine, jigging, chisel fishing, fixed nets, etc., but hairtail is caught using fishing instead of nets to avoid damaging the skin during the fishing process. For example, attach a heavy weight to a fishing line tied with several fishing hooks, throw it into the sea, hold the fishing line with your hand, and judge by your hand whether a hairtail is caught on the hook, and then raise the fishing line with an ancestor when it is determined that a certain number of hairtails have been caught. It is to recover the hairtail.

However, when fishing for a long time while holding the fishing line by hand, considerable fatigue occurs and injuries may occur. Therefore, as the preparation using a fishing rod is widely spread, fatigue and injury are reduced. For example, Utility Model Registration No. 20-0474974 'fishing gear' and Utility Model Publication No. 20-2018-0000103 'fishing gear for hairtail fishing'.

Here, there are various types of fishing rods depending on the fishing location, for example, depending on whether it is freshwater fishing or sea fishing, and even in the case of sea fishing, it can be divided into beach breakwater, beach throwing, seashore rock or boat fishing. In addition, according to its shape, it is roughly divided into a reel fishing rod for fishing with a reel attached and a live fishing rod for fishing without a reel.

In the case of hairtail fishing, each individual borrows a hairtail fishing boat to catch hairtail by equipping an expensive reel fishing rod with various equipment for hobbies or leisure activities. can't equip

Therefore, in the case of fishermen, as shown in FIG. 1, they usually use a long bamboo pole 10 to connect a fishing line 11 to the front end of the bamboo pole 10 and hang several needles to catch the hairtail. . At this time, the rear end of the bamboo pole 10 is inserted and fixed to the pole fixing part 20 installed on the hairtail fishing boat, and the body of the bamboo pole 10 is placed on the pole holder 30. When a plurality of hairtails are bitten by several needles, the bamboo pole 10 maintains elasticity at the same time as it bends due to its characteristics, and the fishing line 11 is operated to catch the hairtail by operating the ancestor 40.

At this time, when bamboo is used for a certain period of time, it is weakened by sea salt, seawater, rainwater, etc., and is easy to be damaged. It is also used by attaching a choritdae in the middle.

However, the length of the bamboo used as a pole for boat fishing is 8 to 12 m long. Due to this long length, it is inevitable to move and store it by laying it on the deck or standing up and down. Therefore, since it is a single piece of bamboo, it is not easy to handle, such as moving and storing, and there is still a problem that durability is not sufficient even if taped together with problems such as being damaged during movement.

In particular, the bamboo pole 10 is used by processing natural bamboo as it is through heating processing, shaving processing, thread reel painting processing, etc., but its performance is greatly affected by the growth degree of bamboo or processing method, etc. The quality such as the degree of warpage varies for each product, and therefore, there is a problem that it is difficult to manufacture products having uniform quality.

In order to solve the above problems, a pole for fishing a hairtail boat, which is formed by molding a fiber-reinforced resin using glass fiber or carbon fiber as a reinforcing fiber, is proposed as a substitute for a bamboo pole. There is a 'stick bar for attachment'. In other words, sheet-like materials mixed with glass fiber and carbon are laminated and combined to obtain a cylindrical tube body, and a plurality of tube bodies with different diameters are inserted so that they can be folded as they are pulled out forward, but the connection part of each node is fitted with a fitting surface. It is configured so that each node is connected by forming a matching surface.

However, in the case of the above-mentioned prior art 'hairtail holder for attaching to a ship', when a tube body made of a plurality of fiber-reinforced resins is simply drawn out in a fit-fitting type, the strength and degree of bending due to the characteristics of the fiber-reinforced resin can be achieved. However, due to the property of being easily broken, the problem of breakage still occurs due to the swelling of the fiber-reinforced resin between the faces to be fitted due to friction between each other every time it is pulled out.

In addition, not only one hairtail rod is attached to the ship, but when multiple hairtail rods are used from the front to the back of the ship, the length of the hairtail rod can be adjusted because it must be obtained at various points depending on the length of the hairtail rod that moves away from the ship. There is a problem with no

Accordingly, it is difficult to actually use a hairtail boat fishing pole having the same structure as the above-described 'shipboard attachment rod', and is currently still being used by taping the outer circumferential surface of the bamboo pole 10 along the longitudinal direction.

The object of the present invention, which has been devised to solve the above problems, is that it can be directly applied to realistic boat fishing for fishermen who take hairtail fishing as their main business, while being easy to handle in movement and storage, high strength and high elasticity with high durability. It is to provide a pole for boat fishing with adjustable length.

Other objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings.

In order to achieve the above object, the hairtail boat fishing pole according to the present invention is inserted and fixed into the pole fixing part of the hairtail fishing boat, and in the hairtail boat fishing pole mounted on the pole holder, it is inserted into the pole fixing part and fixed. A cylindrical rod butt that extends forward of the rod butt and is mounted on the rod holder, and a cylindrical rod bell that is detachably extended and coupled to the front of the rod butt. It includes a rod tip extending and coupled to the front of the rod belly and connected to a fishing line, and each of the insert fixing part, the rod butt, and the rod belly is a glass fiber sheet, a carbon fiber sheet, and a polyethylene fiber sheet, respectively, impregnated with resin. It is characterized in that it is made into a cylindrical tubular body by winding a plurality of times while sequentially stacking and pressing.

In addition, the polyethylene fiber sheet is characterized in that the linear low-density polyethylene fiber sheet.

In addition, the rod butt is characterized in that each of the plurality of first to fourth cylinders having a constant diameter is detachably coupled via a coupler.

In addition, according to claim 3, the coupler is a cylindrical insert, and both ends of the insert are inserted into the inside of another cylinder adjacent to the cylinder to connect the two, and on the outer circumferential surface of the connection between the cylinder and the other cylinder adjacent to the cylinder. It is characterized by bonding by taping.

In addition, one end of the insert is inserted into and bonded to any one of the other cylinders adjacent to the cylinder, and a ring-shaped rubber material is coupled to the other end of the insert to be inserted into another cylinder adjacent to it.

In addition, the coupler includes a bolt having a cylindrical head and a bolt body, and a nut having a thread formed on an inner circumferential surface of the cylindrical shape, and the head of the bolt is inserted into any one of the other cylinders adjacent to the cylinder and bonded, , characterized in that the nut is inserted into another cylinder adjacent to and bonded, and the bolt body of the bolt is screwed to the nut.

In addition, each of the first to fourth cylinders is characterized in that an outer diameter is 55 mm and an inner diameter is 50 mm.

In addition, the load valley is characterized in that a plurality of first to sixth communication, the diameter of which gradually decreases toward the front, are mutually inserted and bonded.

In addition, the first communication has an outer diameter of 50 mm and an inner diameter of 45 mm, the second communication has an outer diameter of 45 mm and an inner diameter of 40 mm, the third communication has an outer diameter of 40 mm and an inner diameter of 35 mm, and the fourth communication has an outer diameter of 40 mm and an inner diameter of 35 mm. The communication has an outer diameter of 35mm and an inner diameter of 30mm, the fifth communication has an outer diameter of 30mm and an inner diameter of 25mm, and the sixth communication has an outer diameter of 25mm and an inner diameter of 20mm.

The hairtail boat fishing pole according to the present invention can utilize the pole fixing part and the pole holder of the hairtail fishing boat as it is through a structure similar to the conventional bamboo pole, so it can be directly applied to realistic boat fishing for fishermen who make hairtail fishing their main business. The rod butt, rod belly, and rod tip are separated from each other, making it easy to handle during transportation and storage. It has the effect of being able to adjust the length by configuring the rod butt with a plurality of detachable cylinders.

1 is a perspective view showing a state of actually shooting hairtail boat fishing using a bamboo pole according to the prior art,
Figure 2 is a side view showing an embodiment of a pole for fishing on a boat according to the present invention,
3 is a block diagram showing the manufacturing process of the insertion fixing part, the rod butt and the rod belly in the embodiment of FIG. 2;
4 is a perspective view showing an insertion fixing part, a rod butt, and a rod belly manufactured according to the embodiment of FIG. 3;
5 to 7 are perspective views showing a coupling process according to the first embodiment between the first and second barrels of the rod butt among the embodiments of FIG. 2,
8 is a perspective view showing a coupling process according to the second embodiment between the first tube and the second tube of the rod butt among the embodiments of FIG. 2;
9 and 10 are perspective views showing a coupling process according to the third embodiment between the first tube and the second tube of Rodbert among the embodiments of FIG. 2;
Figure 11 is an exploded side view for movement and storage of the embodiment of Figure 2,
12 is a cross-sectional side view showing the coupling relationship between the first to sixth communication of the load valley in the embodiment of FIG. 11;
13 is a plan view showing a state of fishing a hairtail boat through the length adjustment of the rod butt using the embodiment of FIG. 2.

Hereinafter, a preferred embodiment of a fishing rod for hairtail boat according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 13 with reference to FIG. 1, the hairtail boat fishing pole according to the present invention is inserted and fixed into the pole fixing part 20 of the hairtail fishing boat and mounted on the pole holder 30 for hairtail boat fishing. It is composed of a pole insertion fixing part 100, a rod butt 200, a rod belly 300 and a rod tip 400.

As shown in FIGS. 2 and 13 with reference to FIG. 1 , the insertion fixing part 100 is inserted into and fixed to the pole fixing part 20 of the hairtail fishing boat in a cylindrical shape. This insertion fixing part 100 has an outer diameter stepwise smaller than the outer diameter of the rod butt 200 to be described later, and after being inserted and fixed into the rod fixing part 20, the stepped surface is caught and holds it so that it is not pushed backward.

As shown in FIGS. 2 and 13 , the rod butt 200 has a cylindrical shape and extends forward of the insertion fixing part 100 and is mounted on the pole holder 30 of the hairtail fishing boat. This rod butt 200 is a part that determines the strength of the long pole, and this part must be strong so that the long pole can be supported without breaking even if a number of hairtails are caught. In addition, the rod butt 200 is mounted on the pole holder 30 of the hairtail fishing boat so that the pole can be maintained without shaking from side to side.

As shown in FIGS. 2, 11 and 12, the load belly 300 is detachably extended and coupled to the front of the load butt 200 in a cylindrical shape. This rod belly 300 is a part where the bending is determined in fishing for hairtail, and it is possible to check how much the hairtail is hanging through the bending.

As shown in FIGS. 2 and 11, the rod tip 400 extends and is coupled to the front of the rod belly 300, and a fishing line is connected thereto. This rod tip 400, unlike the rod body composed of the above-described insertion fixing part 100, rod butt 200, and rod belly 300, is made to be loose and can be variously combined with products widely available on the market. there is.

Here, the insertion fixing part 100, the rod butt 200, and the rod belly 300, which are the bodies constituting the rod for boat fishing according to the present invention, are shown in FIGS. 3 and 4 so that they have high strength and high elasticity as well as high durability. As described above, it is characterized by being made of a polyethylene fiber sheet (PES) together with a glass fiber sheet (GFS) and a carbon fiber sheet (CFS).

That is, as shown in FIGS. 3 and 4, each of the insertion fixing part 100, the rod butt 200 and the rod valley 300 is a glass fiber sheet (GFS), a carbon fiber sheet (CFS) and a polyethylene fiber sheet. (PES) After each is impregnated with resin, it is sequentially stacked and pressed, and then wound multiple times to form a cylindrical tubular body.

Specifically, when manufacturing a cylindrical tubular body, rather than simply intermittently manufacturing three layers of one layer of glass fiber sheet (GFS), two layers of carbon fiber sheet (CFS), and three layers of polyethylene fiber sheet (PES), As shown in FIG. 3, it is characterized in that it is wound continuously in three layers a plurality of times. For example, in the present invention, when the thickness of the tubular body is 2.5 mm, it is manufactured by winding 4 to 5 times in succession in three layers. Through this, there is an effect that can have high strength and high elasticity while resolving the peeling concern when each layer is intermittently manufactured, and securing a more strengthened bonding force as the three layers are continuously wound and manufactured.

In the case of the glass fiber sheet (GFS) and the carbon fiber sheet (CFS), since they have widely known characteristics as a fiber-reinforced composite material, they are omitted, and in the present invention, a polyethylene fiber sheet (PES) is used together. Polyethylene (PE) is one of the most used plastics today, and can be manufactured in a variety of forms using ethylene polymer units. The structure of the material is determined by the amount of branching in the main ethylene polymer, and the smaller the number of branches, the higher the density and strength of the material, and is characterized by excellent wear resistance and durability.

Polyethylene fibers made of such polyethylene (PE) as fibers have low specific gravity (floating in water), extremely low water recovery, quick drying, etc. It is laminated to be located on the outermost layer of the body constituting the pole.

The polyethylene (PE) can be largely divided into high-density polyethylene (HDPE) and low-density polyethylene (LDPE), and the high-density has excellent strength but low flexibility compared to the low-density, while the low-density has a lower density than the high-density, and the rigidity is poor. However, it has excellent elasticity. Therefore, when constituting the body of the pole, it will be possible to manufacture a high-density or low-density polyethylene fiber sheet (PES) in various combinations along with a glass fiber sheet (GFS) and a carbon fiber sheet (CFS) according to characteristics.

However, linear low-density polyethylene (LLDPE), which has the characteristics of both high-density and low-density polyethylene, has properties similar to those of low-density polyethylene, but is more flexible and rigid, so it can implement better physical properties at a thinner thickness. Therefore, it would be more preferable to use the polyethylene fiber sheet (PES) as a linear low-density polyethylene fiber sheet.

On the other hand, as shown in FIG. 13, instead of using one rod for fishing on a fishing boat, rods with different lengths are arranged along the length of the boat to fish at different points. Therefore, the length of the insertion fixing part 100 and the rod belly 300 among the insert fixing part 100, the rod butt 200 and the load belly 300 constituting the body of the rod for boat fishing according to the present invention can be adjusted. Therefore, it is necessary to adjust the length of the rod butt 200.

That is, the rod butt 200 is composed of a plurality of first to fourth cylinders 210, 220, 230, and 240 having a constant diameter, as shown in FIGS. 2 and 11, each of which is shown in FIG. As shown in 8 and 10, it is detachably coupled via the coupler 250. Specifically, each of the first to fourth cylinders 210, 220, 230, and 240 constituting the rod butt 200 has an outer diameter of 55 mm and an inner diameter of 50 mm, and each of the plurality of cylinders has a length of 1.5 m. The total length combined to about 2m can be variously applied from 6m to 8m, and the total length can also be adjusted in various ways by adjusting the number of connecting tubes.

The reason why the rod butt 200 has an outer diameter of 55 mm and an inner diameter of 50 mm is that the rod butt 200 has the largest diameter because it is the most rigid and receives a lot of force among the components constituting the body of the rod. It is necessary to consider the diameter that is coupled with the insertion fixing part 100 in a stepped manner according to the diameter of the installed pole fixing part 20, and thirdly, the diameter of the rod belly 300, which will be described later, decreases as the diameter goes forward, and the rod tip that is finally sold on the market This is because it is necessary to consider the diameter coupled with (400).

Here, the coupler 250 is a cylindrical insert 251 as shown in FIGS. 5 to 7, and both ends of the insert 251 are inserted into the other cylinder 220 adjacent to the cylinder 210, respectively. The two are connected, and the outer circumferential surface of the connection portion between the tube 210 and the adjacent tube 220 is coupled by taping. The cylindrical insert 251 and taping are structures that fishermen of hairtail fishing boats can connect very easily on board, but there is a risk of loss because the insert 251 is separated separately, and the insertion of the insert 251 There is a fear that the inner circumferential surface of the cylinder 220 is broken.

Therefore, as shown in FIG. 8, one end of the insert 251 is inserted into and bonded to one of the other cylinders 252 adjacent to the cylinder 251 and bonded to the cylinder 251. A ring-shaped rubber material 252 is coupled to the other end so that it can be inserted into another cylinder 220 adjacent to it. Through this, the risk of loss of the insert 251 to which one end is previously bonded is prevented, and the rubber material 252 is coupled to the other end of the insert 251, so that when inserting another cylinder 220 adjacent to the cylinder 220 ) can be prevented from being easily separated by increasing the frictional force through press-fitting while preventing the inner circumferential surface from being crushed.

Each of the first cylinder 210, the second cylinder 220, the third cylinder 230, and the fourth cylinder 240 of the rod butt 200 described above may be any one cylinder. For example, in the drawing, when one cylinder is the first cylinder 210, the other adjacent cylinder is shown as the second cylinder 220, but when one cylinder is the second cylinder 220, the third cylinder 230 is adjacent to the other cylinder. It becomes a cylinder, and when one cylinder is the third cylinder 230, the fourth cylinder 240 becomes another cylinder adjacent to it. At this time, the fourth cylinder 240 and the load valley 300 may also be coupled to each other through the above-described coupler 250, and when one cylinder is the fourth cylinder 240, the other cylinder adjacent to the load valley 300 ) can be

In addition, the coupler 250 may be detachably connected through a coupling between a bolt 253 and a nut 254 as shown in FIGS. 9 and 10 without separate taping. That is, the coupler 250 may include a bolt 253 having a cylindrical head 253a and a bolt body 253b, and a nut 254 threaded on an inner circumferential surface of the cylindrical shape. At this time, the head 253a of the bolt 253 is inserted into one of the other cylinders 220 adjacent to the cylinder 210 and bonded, and the nut 254 is connected to the other cylinder 220 adjacent to the cylinder 220. ) is inserted and bonded, and the bolt body 253b of the bolt 253 is screwed to the nut 254.

On the other hand, as shown in FIGS. 2, 11 and 12, the rod belly 300 is detachably extended and coupled to the front of the rod butt 200 described above. It is configured so that the diameter gradually decreases as the diameter increases, and in particular, the plurality of first to sixth communication channels 310, 320, 330, 340, 350, and 360 are mutually inserted and bonded.

The structure and coupling relationship of the load valley 300 is to be manufactured by dividing into a plurality of communications, because it is difficult to manufacture and there is a high risk of damage if configured to be tapered with one communications. However, since the load belly 300 receives force as a single body, a plurality of communication is not a separate connecting member, but each is inserted into each other and bonded to act as a single body.

Specifically, the first communication 310 has an outer diameter of 50 mm and an inner diameter of 45 mm, the second communication 320 has an outer diameter of 45 mm and an inner diameter of 40 mm, and the third communication 330 has an outer diameter of 40 mm. , the inner diameter is 35 mm, the fourth communication 340 has an outer diameter of 35 mm and an inner diameter of 30 mm, the fifth communication 350 has an outer diameter of 30 mm and an inner diameter of 25 mm, the sixth communication 360 Silver has an outer diameter of 25 mm and an inner diameter of 20 mm.

That is, since each of the first communication 310 to the sixth communication 360 individually has a constant diameter, it is easy to manufacture, and each of them can be mutually inserted and bonded, so that the coupling is easy. It is configured to have a small diameter so that it can show sufficient bending, which is the role of the load belly 300.

As described above, the hairtail boat fishing pole according to the present invention can utilize the pole fixing part 20 and the pole holder 30 of the hairtail fishing boat as it is through a structure similar to the conventional bamboo pole, so that hairtail fishing is the main business It can be directly applied to realistic boat fishing for fishermen, and the rod butt (200), rod valley (300) and rod tip (400) are separated to facilitate movement and storage handling, and glass fiber sheet (GFS), carbon fiber By stacking and pressing the sheet (CFS) and the polyethylene fiber sheet (PES), there is an effect of being able to adjust the length by configuring the rod butt 200 with a plurality of detachable cylinders along with high durability, high strength and high elasticity.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and change the technical spirit of the present invention in various forms. Therefore, such improvements and changes will fall within the protection scope of the present invention as long as they are obvious to those skilled in the art.

20: pole fixing part
30: pole holder
GFS: Glass fiber sheet
CFS: Carbon fiber sheet
PES: polyethylene fiber sheet
100: insertion fixing part
200: Rodbert
210: first cylinder 220: second cylinder
230: 3rd cylinder 240: 4th cylinder
250: coupler
251: insert 252: rubber material
253: Bolt
253a: head 253b: bolt body
254: nut
300: Road Valley
310: first communication 320: second communication
330: 3rd communication 340: 4th communication
350: fifth communication 360: sixth communication
400: rod tip

Claims (9)

In the hairtail boat fishing pole inserted into the pole fixing part of the hairtail fishing boat and mounted on the pole holder,
A cylindrical insertion fixing part inserted into and fixed to the pole fixing part, a cylindrical rod butt extended and coupled forward of the insert fixing part and mounted on the pole holder, and a detachably extended coupling forward of the rod butt. It includes a cylindrical load belly and a rod tip extending and coupled to the front of the load belly and connected to a fishing line,
Each of the insertion fixing part, the rod butt and the rod belly,
A glass fiber sheet, a carbon fiber sheet, and a polyethylene fiber sheet are each impregnated with a resin, and then sequentially laminated into three layers and rolled multiple times in succession while pressurizing to produce a cylindrical tubular body,
said Rodbert,
Each of the plurality of first to fourth cylinders having a certain diameter is detachably coupled via a coupler,
The load valley,
A hairtail boat fishing pole, characterized in that a plurality of first to sixth passages, the diameter of which gradually decreases toward the front, are mutually inserted and bonded.
According to claim 1,
The polyethylene fiber sheet,
A fishing rod for hairtail boat, characterized in that it is a linear low-density polyethylene fiber sheet.
delete According to claim 1,
The coupler,
It is a cylindrical insert,
Both ends of the insert are inserted into the inside of another barrel adjacent to the barrel to connect the two, and the outer circumferential surface of the connection between the barrel and the other barrel adjacent to the rod is coupled by taping. Rod for fishing.
According to claim 4,
One end of the insert is inserted into any one of the other cylinders adjacent to the cylinder and bonded, and a ring-shaped rubber material is coupled to the other end of the insert to be inserted into another adjacent cylinder. Rod for fishing.
According to claim 1,
The coupler,
A bolt having a cylindrical head and a bolt body;
Including a nut having a thread formed on the inner circumferential surface of the cylinder,
Characterized in that the head of the bolt is inserted into and bonded to any one of the other cylinders adjacent to the cylinder, the nut is inserted into and bonded to another adjacent cylinder, and the bolt body of the bolt is screwed to the nut A fishing pole for hairtail boat fishing.
According to claim 1,
Each of the first to fourth cylinders,
A hairtail boat fishing pole, characterized in that the outer diameter is 55 mm and the inner diameter is 50 mm.
delete According to claim 1,
The first communication has an outer diameter of 50 mm and an inner diameter of 45 mm,
The second communication has an outer diameter of 45 mm and an inner diameter of 40 mm,
The third communication has an outer diameter of 40 mm and an inner diameter of 35 mm,
The fourth communication has an outer diameter of 35 mm and an inner diameter of 30 mm,
The fifth communication has an outer diameter of 30 mm and an inner diameter of 25 mm,
The sixth communication has an outer diameter of 25mm and an inner diameter of 20mm.

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