Fishing float

Abstract

To prevent an additional weight 12 additionally stored in a top part 3 from moving to the tip side of the top part and impairing weight balance of a float 1 in a fishing float in which the top part 3 of the float 1 is removably attached to a float body part 2 provided with self-supporting weights 4 and 5.SOLUTION: A top part 3 is composed by connecting a lower side first top division part 3a and an upper side second top division part 3b in series, and an inner diameter of the second top division part 3b is made smaller than an outer diameter of an additional weight 12 so as to inhibit the additional weight 12 from moving to the second top division part 3b.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a fishing float used in fishing. [Background technology]

[0002] Generally, when fishing, a fishing float (float, floating log) is attached to the fishing line that extends from the fishing rod in order to set the sinking position (depth position) of the hook (fishhook) from the water surface (sea surface) and to confirm the bite. Among such floats, there is one that is known that is composed of a float body that is fully or partially submerged in the water and a top part that extends upward from the upper edge of the float body and protrudes above the water surface, and is connected in a continuous manner. A typical example of such a float is generally called a "stick float." In order to make such a float stand on the water surface, a weight-adjusted sinker is required. On the other hand, a float configuration has been proposed in which the top part is removably attached to the float body, and the float body is equipped with a weight-adjusted self-supporting weight to make the float self-supporting (so-called "self-supporting float") (see, for example, Patent Document 1).When using such a float for fishing, the float will stand on its own without the need to adjust the weight each time on site, thereby improving convenience. However, when fishing, the fishing environment changes, such as the flow of the tide or river, the tide level, the water volume, the turbidity of the water, and the water temperature, and there are cases where it is necessary to adjust the self-supporting state of the float in response to these changes. For this reason, some self-supporting floats have been proposed that allow weights to be added as needed (see, for example, Patent Documents 2 and 3). However, all of these floats have a storage chamber formed in the float body so that additional weights can be added as desired, so it is necessary to form a recessed storage chamber in the float body to store the additional weights in addition to the space for providing the self-supporting weights, and a structure is also required to seal the storage chamber so that it can be opened and closed freely, which not only makes the structure of the float body complicated, but also creates problems such as the upper end of the float body becoming thicker and impairing its function as a float. In response to this, the top part provided at the upper end of the float body is often made cylindrical to reduce weight, and a configuration has been proposed in which a weight is built into the cylindrical top part (see, for example, Patent Document 4). However, although this has a weight built into the top part, in order to attach and detach the top part from the float body, a core material is fitted and assembled into the lower end of the top part so that it can be inserted and removed freely into the upper end of the float body, so the lower end of the top part is sealed by the core material, which creates a problem in that it is not possible to additionally install a weight into the top part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7050380 [Patent Document 2] Registered Utility Model Publication No. 3042245 [Patent Document 3] JP 2006-304745 A [Patent Document 4] Publication number 5-38620 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, in a configuration in which the top part is removably attached to the float main body, rather than being attached to the float main body via a core material fitted into the lower end of the top part as in Patent Document 4, it is proposed to fit the top part removably into a cylindrical connecting body provided at the upper end of the float main body, as in Patent Document 1, and to make the lower end of the top part open, so that additional weights can be freely inserted and removed from the opening at the lower end of the top part. However, in a configuration where an additional weight can be simply inserted into the top section, the additional weight can move up and down freely within the top section, and as a result, for example, when casting a tackle far away, the float will land on the water with the additional weight moving to the tip side of the top section due to the inertia of the casting. When the float lands on the water with the additional weight moving to the tip side of the top section in this way, the tip side that receives the weight of the additional weight becomes heavy and the weight balance is lost, and as a result, not only is the speed and smooth standing up of the float that has landed on the water hindered (self-supporting), but the presence of garbage (impurities) in the top section may hinder the movement of the additional weight to the lower end side, in which case the weight balance of the float is lost and the float will not be able to demonstrate its delicate and sensitive floating and sinking function, and these are the problems that the present invention aims to solve. [Means for solving the problem]

[0005] The present invention was created in consideration of the above-mentioned circumstances and with the objective of solving these problems. The invention of claim 1 comprises a float body part whose lower end is connected to a fishing line extending from a fishing rod, a top part whose lower end is detachably attached to the upper end of the float body part, a weight for the float body part to stand on its own, The float is provided with a cylindrical body whose upper end projects from the upper end of the float body and is fitted and attached in a fixed state to the upper end of the float body, and a cylindrical connecting body whose lower half is fitted and assembled to the upper end of the cylindrical body in a fixed state, and the lower end of the top part is fitted and assembled to the upper half of the connecting body so as to be freely inserted and removed. In fishing floats, In making a fishing float in which an additional weight is further added to the top part, The top portion has a lower end The upper half of the connectora first top divided part that is detachably attached to the upper half of the connecting body and a second top divided part that is connected at its lower end to the upper end of the first top divided part; the first top divided part is a storage chamber for an additional weight that is inserted in a removable manner from the lower end of the first top divided part that is detached from the upper half of the connecting body; The additional weight stored in the first top section, which is the storage chamber, is restricted in movement so as to move up and down only within the first top section by a movement restriction means provided on the second top section side and the cylindrical body side to restrict the movement of the additional weight toward the second top section side and the cylindrical body side. This is a fishing float characterized by the above features. In the invention of claim 2, the first top divided part and the second top divided part are connected in a continuous manner by fitting the lower end part of the second top divided part into the upper end part of the first top divided part, and the movement restricting means is Cylinder and 2. The fishing float according to claim 1, characterized in that it is provided on the second top divided portion. The invention of claim 3 is characterized in that the movement restriction means is The inner diameter of the cylinder and 3. The fishing float according to claim 2, wherein the inner diameter of the cylindrical second top divided portion is smaller than the outer diameter of the additional weight. The invention of claim 4 is as follows: The sinker is composed of a main sinker for self-supporting, which is provided at the bottom of the float body, and an auxiliary sinker whose weight is adjusted so that the self-supporting position is a preset draft position, and which is fixedly fitted into the cylinder. The draft position adjusted by the auxiliary sinker is the position opposite the lower end of the connecting body and the upper end of the float body. The additional sinker is a sinker added to the main sinker and auxiliary sinker, and is fitted into the upper half of the connecting body with the lower end of the first top divided part between them when the float is self-supporting and in a state of being restricted from downward movement by abutting the upper end of the cylinder. 4. The fishing float according to claim 3. Effect of the Invention

[0006] According to the invention of claim 1, when an additional weight is to be added to a float having a self-supporting weight attached to the float body at a fishing site, the additional weight can be inserted freely from the lower end of the first top divided part of the top part removed from the float body, and thus the top part can be effectively used to attach the additional weight, but the inserted additional weight is restricted from moving to the second top divided part by the movement restricting means attached to the top part. As a result, the additional weight incorporated in the top part so as to be freely inserted and removed is restricted from moving to the second top divided part while the first top divided part closest to the float body part is in the storage chamber, so that the additional weight in the storage chamber is prevented from moving to the second top divided part due to the inertial force received when the float is cast far away, and not only does the float raised on the water surface quickly and smoothly as in the case of no additional weight, but also prevents the additional weight that has moved to the second top divided part from returning to the first top divided part due to the presence of foreign matter or the like, thereby preventing the weight balance of the float from being impaired. Moreover, Since the movement restricting means is provided on the second top section itself which is fitted into the upper end portion of the first top section, it is possible to provide the movement restricting means while avoiding a complex structure. Claim 2 By adopting this invention, the movement regulating means is configured by either the inner diameter of the cylindrical second top separate portion being smaller than the outer diameter of the additional weight, the lower end of the cylindrical second top separate portion being sealed via a regulating member, or the second top separate portion being a solid body, thereby enabling the movement regulating means to be configured simply. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. 2 is a vertical cross-sectional view of the float according to the first embodiment with the top part removed. [Diagram 3] A vertical cross-sectional view of the main parts of the float. [Figure 4]4 is an enlarged vertical cross-sectional view of a main portion showing a first top separated portion. [Diagram 5] 1A, 1B, and 1C are longitudinal sectional views showing various modified examples of the first embodiment. [Figure 6] 13(A), (B), and (C) are vertical cross-sectional views showing various modified examples of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a fishing float, which is composed of a long float body 2 that is bulging downwards with a larger diameter at the bottom, and a thin rod-like top portion 3 that protrudes upward from the top of the float body 2. A main weight 4 for making the float 1 stand on its own is provided at the bottom of the float body 2, and an auxiliary weight 5 for helping the float 1 stand on its own is provided at the top. The float 1 has a connecting part 6 formed in an arc-like curve protruding from the lower end of the float body 2, through which a fishing line (line) 7 from a fishing rod (not shown) is connected. In this case, the connection of the connecting part 6 to the fishing line 7 is a so-called guided connection that allows the fishing line 7 to move up and down freely, and float stoppers 8 are provided above and below the float 1 of the fishing line 7, so that the guided range of the float 1 is regulated. Incidentally, the float 1 can be not only one in which the fishing line 7 is directly inserted into the connecting part 6 in a loose fit manner as in this embodiment, but also one in which the connecting part 6 is detachably connected to the other end of a commercially available (known) connecting metal fitting (not shown) such as a swivel joint, one end of which is inserted into the fishing line 7 in a loose fit manner, or any other suitable connecting means known in the art. Needless to say, the float stopper 8 can be any suitable one known in the art, such as a spherical one made of rubber elastic material or one with a concentrated winding of the line.

[0009] The float main body 2 is made of buoyant wood such as balsa wood or paulownia wood, or an expandable material (synthetic resin material such as expanded polystyrene or expanded polyurethane), and has a main weight 4 attached to its lower end to make the float 1 stand on its own, and the connecting part 6 is formed to protrude from the lower end of the main weight 4. On the other hand, an attachment hole 2a is formed at the upper end of the float main body 2, and a cylindrical body 9 made of a hard resin material (e.g., nylon, polycarbonate, polyvinyl chloride, polystyrene) is fitted into the attachment hole 2a with its upper end 9a protruding from the upper end of the float main body 2. The float 1, which is adjusted to be self-supporting by the main weight 4, is set in the lower half 9b of the cylindrical body 9 at a predetermined draft position (the water surface position when it is self-supporting, which is the water surface position when it is self-supporting, in this embodiment). The position where the upper end of the float body 2 faces the lower end of the connector 11 ) H, an auxiliary weight 5 whose weight is adjusted so that it can stand on its own is fitted in. In this case, the auxiliary weight 5 is recessed within the cylindrical body 9 and is set so as not to protrude from the upper edge of the cylindrical body 9. Incidentally, the weight adjustment of the auxiliary weight 5 is described in detail, for example, in the above-mentioned Patent Document 1. In this case, the cylindrical body 9 and the auxiliary weight 5 are fixed by a fixing means such as an adhesive so as not to move accidentally. In addition, the float 1 in which the present invention is implemented is provided with a main weight 4 and an auxiliary weight 5 separately to make the float self-supporting at the draft position H, as in this embodiment, but it goes without saying that the present invention can also be implemented with a self-supporting float 1 provided only with a main weight 4.

[0010] A lower half 11b of a cylindrical connector 11 made of a flexible rubber-like elastic material is fitted and fixed to the upper end 9a of the cylindrical body 9 protruding from the float main body 2. A lower end 3aa of the top part 3, which will be described later, is fitted and assembled in an insertable and removable manner into the upper half (upper end) 11a of the connector 11 protruding from the cylindrical body 9, and thus the float 1 is constructed. In this embodiment, the connecting body 11 is a cylinder having an outer shape shaped like a truncated cone. This shape makes the upper end thinner, which makes the upper end flexible and easily deformed, making it easier to insert the lower end of the top part 3. However, when the top part 3 is inserted up to a predetermined insertion position (for example, the position where the lower end of the top part 3 abuts the upper end of the cylinder 9), the lower end of the top part 3, which is deeply inserted into the connecting body 11, is inserted into the middle part which is thicker than the tip part, and has strong rubber elasticity so that it is less likely to come out. However, the connector 11 is not limited to the truncated cone shape of this embodiment, and may of course be a highly versatile straight tube-like cylinder (all with the same outer diameter).

[0011] The top portion 3 is formed in a cylindrical shape with a top surface (upper end surface) sealed with sealing material 3c and an open bottom surface, and the top portion 3 is configured by connecting first and second top divided portions 3a, 3b in a series. Specifically, the first top divided portion 3a has its lower end portion 3aa fitted (inserted) into the upper half 11a of the connecting body 11 provided at the upper end portion of the float main body 2 so as to be freely inserted and removed (detachable), and the second top divided portion 3b has its lower end portion 3ba fitted into the upper end portion 3ab of the first top divided portion 3a and fixed by a fixing means such as an adhesive.By being configured in this manner, the top portion 3 is made up of the first and second top divided portions 3a, 3b connected in a continuous manner. In this case, the first top divided part 3a fitted into the upper half 11a of the connecting body 11 is thin, with an outer diameter equal to that of the cylindrical body 9 and an inner diameter larger than that of the cylindrical body 9, and the lower end part 3aa is fitted into the upper half 11a of the connecting body by a light press fit that can be performed by an angler. When the fitted first top divided part 3a is removed from the connecting body 11, it is a forceful removal that can be performed by an angler, but it is set so that the top part 3 does not come off inadvertently from the float main body 2 during normal fishing. Incidentally, the top portion 3 may be configured not only by a pair of top divided portions 3a and 3b of the first and second top divided portions as in the present embodiment, but of course, it may be configured in a series using three or more top divided portions.

[0012] Even with the float 1 in which the draft position H is set using the main weight 4 for self-standing and the auxiliary weight 5 for self-standing position adjustment in this way, there may be a case where the angler wants to add an additional weight 12. The float 1 of the present embodiment is formed assuming such a situation. The additional weight 12 used in the present embodiment is a long, solid bar weight (thread weight), and it is preferably pre-weight-adjusted to, for example, 0.5 g, 1.0 g, etc. The outer diameter X of this additional weight 12 is set to be smaller than the inner diameter Y of the first top divided portion 3a but larger than the inner diameter Z of the second top divided portion 3b (Z < X < Y). And by being set in this way, the additional weight 12 is inserted into the first top divided portion 3a so as to be movable in the vertical direction, and thus the first top divided portion 3a becomes a storage chamber (accommodation chamber) for the additional weight 12, and on the second top divided portion 3b side of the inserted additional weight 12 To the upper side The movement is restricted because the inner diameter Z of the second top divided portion 3b is smaller than the outer diameter of the additional weight 12, and in this way, the movement restricting means of the present embodiment is configured. Incidentally, the inner diameter W of the cylindrical body 9 is even smaller than the inner diameter Z of the second top divided portion 3b (W < Z), and thereby It is on the lower side the movement of the additional weight 12 to the A movement control means is configured to control cylindrical body 9 side is restricted, and thereby the additional weight 12 can only move up and down within the first top divided portion 3a that serves as the storage chamber. The additional weight 12, whose movement is restricted by the vertical movement restricting means in this manner, is in a downward movement restricted state in which it abuts against the upper end of the cylindrical body 9 when the float 1 is freestanding, as is clear from Figure 3. In this state, the lower end of the first top divided portion is fitted into the upper half 11a of the connecting body 11 with the lower end portion being between the upper half 11a and the first top divided portion.

[0013] In the embodiment of the present invention configured as described above, the float 1, with the main line 7 connected through the connecting portion 6 provided at the lower end of the float main body 2, is cast (thrown) into the sea surface (water surface) together with a tackle including a fishing hook (not shown) provided at the lower end of the main line 7 to fish. The float 1 cast into the sea surface will stand on its own with its weight adjusted so that the draft position H is at the water surface by the weights of the main weight 4 and auxiliary weight 5 (corresponding to the ``self-supporting weights'' of this invention). However, some anglers may want to attach an additional weight 12 to this float 1. In such a case, the top portion 3 is removed from the float main body 2, the additional weight 12 is inserted and assembled through the lower opening of the lower end portion 3aa of the first top divided portion 3a, and the lower end portion 3aa of the first top divided portion 3a is then fitted and assembled into the connecting portion 6 to create a float 1 with the additional weight 12 added to the first top divided portion 3a.

[0014] When the float 1 with the additional weight 12 added in this manner is cast far away together with the fishing tackle, the float 1 will fly with the lower end where the heavy main weight 4 is attached leading the way. At this time, the additional weight 12 will try to move due to inertia from the first top divided part 3a in which it is stored towards the second top divided part 3b. However, because the inner diameter Z of the second top divided part 3b is smaller than the outer diameter X of the additional weight 12, the lower edge of the second top divided part 3b will restrict the movement of the additional weight 12 towards the second top divided part 3b. As a result, even when cast far, the additional weight 12 remains only within the first top divided portion 3a, which has a short vertical length, preventing the vertical weight balance of the float 1 from being disturbed as would be the case if the additional weight 12 moved to the second top divided portion 3b. After being dropped onto the water surface, the position corresponding to the addition of the additional weight 12 becomes the draft position and the float 1 quickly becomes independent, allowing it to be used as a float that suits the angler's needs.

[0015] In this case, the second top divided portion 3b, which is set to a small diameter, itself functions as a means for restricting the movement of the additional weight 12, and as will be described later, there is no need to provide a separate restricting member 13. Furthermore, by making the second top divided portion 3b a solid body, the top portion 3 does not become heavy. Rather, since the second top divided portion 3b has a small diameter, the top portion 3 can be made lighter, which has the advantage of improving the function of the float 1. Furthermore, when the top portion 3 becomes long, there is a problem that it is easily bent at the base end side. To avoid this problem, in this embodiment, the upper end portion 3ab of the first top divided portion 3a and the lower end portion 3ba of the second top divided portion 3b are fitted together to form a double structure, thereby reinforcing the base end side of the top portion 3. This configuration, which also serves as reinforcement, can also be used to restrict the movement of the additional weight 12, contributing to simplifying the structure.

[0016] The movement restricting means for restricting the movement of the additional weight 12 to the second top divided portion 3b is not limited to that in the above embodiment, and may be implemented by sealing the lower end portion 3aa of the second top divided portion 3a via a restricting member 13, as in the modified example shown in Fig. 5(A). In this case, the restricting member 13 may be the same member as that constituting the top portion 3c of the top part 3, as shown in Fig. 5(B). Furthermore, the second top divided portion 3b may be a solid body. In this manner, when the lower edge of the second top divided portion 3b is completely sealed and a spherical shape such as a round or oval sphere, such as a lead weight, a hammer or a splitting pin, is to be added as an additional weight 12, a movement restriction means is configured by making the second top divided portion 3a smaller in diameter than the outer diameter of the additional weight, thereby preventing the additional weight from getting stuck in the lower end opening of the second top divided portion and becoming difficult to return.

[0017] Of course, the present invention is not limited to the above-described embodiment. When the top portion 3 is connected in a series using the top divided portions, instead of the configuration in which the second top divided portion is internally fitted into the first top divided portion, the divided portions 3a, 3b may be connected in a series by externally fitting the upper end portion 3ab of the first top divided portion 3a and the lower end portion 3ba of the second top divided portion 3b into both end edges of the connecting member 14, as in the second embodiment shown in FIG. 6. In this way, the connecting portion of the divided portions 3a, 3b does not have a stepped shape as in the first embodiment, and can have the same outer diameter. In this case, the movement restriction means of the present invention can be easily constructed by making the inner diameter of the connecting member 14 smaller than the outer diameter of the additional weight 12 as shown in Figure 6(A), by fitting the restricting member 13 into the connecting member 14 as shown in Figure 6(B), or by making the connecting member 14 a solid body as shown in Figure 6(C).

[0018] Incidentally, the float 1 in this embodiment has been described as having its weight adjusted so that the draft position H is at the water surface by the main weight 4 and auxiliary weight 5 attached to the float body 2, but of course the float of the present invention is not limited to this, and the present invention can also be implemented with a float 1 in which the weight of the main weight 4 and auxiliary weight 5 alone is not sufficient to make the draft position H the water surface, and the present invention can also be implemented with a float in which a specified weight-set weight (load weight) is further provided so that the draft position H is set to be the water surface.

[0019] When fishing using a float 1 with the weight adjusted so that such a loading weight is required, for example, in the case of fish such as black porgy (great porgy) that tend to swim relatively at the bottom (deep water) and engage in predatory activity, it is necessary to sink the fishing hook to the swimming position early, and for this reason a weight (loading weight) is attached to the lower end of the main line where it is connected to the line's leader (the fishing line to which the fishing hook is connected), so that fishing is carried out with the fishing hook submerged early in the sea. In such cases, it may be necessary to add an additional weight, and if such an additional weight is attached adjacent to the loading weight, the movement of the fishing hook connected to the leader may become unnatural, causing the fish to become wary and not bite. In such cases, the problem can be solved by adding an additional weight to the top part as in the present invention. Furthermore, in the case of particularly wary fish such as sea bream, the mere presence of a load weight at the point where the main line is connected to the line can make the fish feel unnatural in the movement of the line and they may be hesitant to bite.In such cases, if the load weight itself is inserted into the top section as an additional weight, the load weight will no longer be present on the line and it will be possible to perform float fishing in an almost perfect state (fishing in which the load weight is made as light as possible and the fishing hook drifts naturally with the current of the tide (water)).In such cases, a float embodied in this invention can be used.

[0020] Furthermore, when fishing by sinking a float underwater (underwater), a so-called "underwater float" is used, but the float to which the present invention is applied can also be used as an underwater float by adding an additional weight. In that case, the sinking speed of the float can be adjusted by the weight of the additional weight, and by adjusting the weight of the additional weight, it is possible to sink the float at a speed that matches the sinking speed of the fishing hook with bait attached. In this case, the sinking of the fishing hook with bait attached becomes natural without being affected by the sinking speed of the float, which is effective against wary fish. The sinking speed of such a float can be finely adjusted by the amount of additional weight, and the adjusted additional weight can be freely stored in the first top divided part of the top part which serves as a storage chamber. Therefore, although the float is a self-supporting float, it can also be conveniently used as a float for sinking fishing. By adjusting the weight of the additional weight in this manner, the self-supporting float can be used as a multi-purpose fishing float, and by removing the additional weight after use, it can be used as the original self-supporting float without compromising any of its functions. [Industrial Applicability]

[0021] The present invention can be used as a fishing float for use in fishing. [Explanation of symbols]

[0022] 1 Float 2 Float body 3 Top Section 3a First top division 3b Second top division 4 Main weight 5 Auxiliary weight 9 Cylinder 11 Concatenation 12 Additional weights 13 Regulatory components 14 Connecting members W: Inner diameter of cylinder X Outside diameter of additional weight Y Inner diameter of first top division Z Inner diameter of second top division

Claims

1. A float body portion whose lower end is connected to a fishing line extending from a fishing rod; A top portion whose lower end is detachably attached to the upper end of the float body; A self-supporting weight provided on the float body; A cylindrical body whose upper end protrudes from the upper end of the float body and is fixedly fitted to the upper end of the float body; a cylindrical connector having a lower half portion fixedly fitted onto the upper end of the cylindrical body; In a fishing float in which the lower end of the top part is inserted and assembled into the upper half of the connecting body so as to be freely inserted and removed, In making a fishing float in which an additional weight is further added to the top part, The top portion is configured in a continuous manner using a plurality of top divided portions, the plurality of top divided portions including at least a first top divided portion whose lower end is detachably attached to the upper half of the connecting body, and a second top divided portion whose lower end is connected to the upper end of the first top divided portion; The first top separate part is a storage chamber for an additional weight that is inserted in and out of the lower end of the first top separate part when it is detached from the upper half of the connecting body; This fishing float is characterized in that the additional weight stored in the first top section, which is the storage chamber, is restricted in movement so that it can only move up and down within the first top section by movement restriction means provided on the second top section side and the cylindrical body side to restrict the movement of the additional weight toward the second top section side and the cylindrical body side.

2. The first top divided portion and the second top divided portion are connected in a continuous manner by fitting the lower end portion of the second top divided portion into the upper end portion of the first top divided portion, 2. The fishing float according to claim 1, wherein the movement restricting means is provided on the cylindrical body and the second top divided portion.

3. 3. The fishing float according to claim 2, wherein the movement restricting means is configured such that the inner diameter of the cylindrical body and the inner diameter of the cylindrical second top divided portion are smaller than the outer diameter of the additional weight.

4. The sinker is composed of a main sinker for self-supporting, which is provided at the bottom of the float body, and an auxiliary sinker whose weight is adjusted so that the self-supporting position is a preset draft position and which is fitted and assembled in a fixed state into the cylinder; The draft position adjusted by the auxiliary weight is the position where the lower end of the connecting body faces the upper end of the float body, The additional weight is a weight added to the main weight and auxiliary weight, and is fitted into the upper half of the connecting body with the lower end of the first top divided portion located between the upper half of the connecting body and the additional weight, when the float is in a state where it is free-standing and abuts against the upper end of the cylindrical body, restricting its downward movement.

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