WO2012160946A1

WO2012160946A1 - Swim fin

Info

Publication number: WO2012160946A1
Application number: PCT/JP2012/061328
Authority: WO
Inventors: 謙二高木
Original assignee: Takagi Kenji
Priority date: 2011-05-26
Filing date: 2012-04-27
Publication date: 2012-11-29
Also published as: JP2012245125A

Abstract

[Problem] To provide a swim fin that is light, has a simple structure and does not interfere with walking. [Solution] The swim fin (2) is provided with a sheet-shaped part (11), two or more rods (22), and an affixing part (23) that affixes the two or more rods (22) directly or via the sheet-shaped part (11) to the user's foot. When affixed to the user's foot, each of the two or more rods (22) is disposed along the front-to-back direction of the user's foot. And when affixed directly or via the sheet-shaped part (11) to the user's foot by the affixing part (23), the two or more rods (22) maintain the sheet-shaped part (11) in the shape of the swim fin. The two or more rods (22) are also capable of being elongated and contracted and being folded by rotating in the longitudinal direction. The swim fin is convenient in that the sheet-shaped part (11) does not get in the way when walking on land, etc. with the two or more rods (22) contracted or folded.

Description

Swimming fins

The present invention relates to a so-called swimming fin used for scuba diving (hereinafter simply referred to as “diving”).

There are some ideas for swimming fins.

For example, Patent Document 1 discloses a swimming fin that uses a lightweight material and realizes a simple structure, is compact, and can be walked on land while being worn.

Further, Patent Document 2 discloses a swimming fin that allows a blade part that generates propulsive force to be flipped up and folded when swimming, and that makes it easy to walk on the beach while waking up and to go up and down the ladder during diving. Disclosure.

Further, Patent Document 3 discloses a swimming fin that allows a blade portion to be taken in and out of a shoe bottom, enables the blade to be stored with a simple structure, and realizes light weight.

Japanese Utility Model Publication No. 7-1954 JP 2005-125044 A Japanese Utility Model Publication No. 64-51401

By the way, swimming fins are used for diving, etc., but the universal problem is that the blade part that generates propulsive force when swimming is obstructive or heavy when it is not swimming. It has become.

Therefore, an object of the present invention is to provide a swimming fin that is lightweight and convenient to carry.

The present invention has been conceived in view of the above object,
A sheet-like part;
Two or more rods,
A fixing part for fixing the two or more rod-like bodies to a user's foot directly or via the sheet-like part,
Each of the two or more rod-shaped bodies is arranged along the front-rear direction of the user's foot in a state of being fixed to the user's foot by the fixing portion,
The two or more rod-shaped bodies provide a swimming fin that maintains the sheet-like portion in the shape of a swimming fin in a state of being fixed to the user's foot directly or via the sheet-like portion by the fixing portion. (First embodiment).

In the first embodiment described above,
Each of the two or more rod-shaped bodies has an outer rod-shaped body that is a hollow rod-shaped body and an inner rod-shaped body that is a rod-shaped body that is accommodated in a hollow portion of the outer rod-shaped body. A configuration may be adopted in which the material is retracted in the longitudinal direction by being accommodated in the outer rod-like body (second embodiment).

In the above first or second embodiment,
Each of the two or more rod-shaped bodies has two or more rod-shaped bodies that are rotatably connected to each other, and one of the two or more rod-shaped bodies is the other rod-shaped body at the connected portion. Alternatively, a structure that can be folded in the longitudinal direction by rotating with respect to the center may be employed (third embodiment).

In the third embodiment,
The two or more rod-shaped bodies can be folded in a state where the two or more rod-shaped bodies are fixed to the user's foot by the fixing portion. In the state where the two or more rod-shaped bodies are folded, the user can You may employ | adopt the structure which can be walked (4th embodiment).

In any one of the first to fourth embodiments,
The fixing part may adopt a configuration having a shoe-like body that accommodates the user's foot (fifth embodiment).

In any one of the first to fifth embodiments described above,
One of the two or more rod-shaped bodies is disposed on the inner side surface of the user's foot, and the other of the two or more rod-shaped bodies is different from the one rod-shaped body. On the outer side of the
Left-right direction of the sheet-like portion disposed between at least one of the one rod-shaped body and the inner side surface of the user's foot and between the other rod-shaped body and the outer side surface of the user's foot. A configuration including a pedestal for facilitating the spread of the above may be adopted (sixth embodiment).

In any one of the first to sixth embodiments,
A configuration may be adopted in which at least two rod-shaped bodies among the two or more rod-shaped bodies are traversed in the left-right direction, and the at least two rod-shaped bodies are positioned in the left-right direction (seventh embodiment). ).

In any of the first to seventh embodiments,
A configuration may be adopted in which a mesh portion is disposed at a middle position in the left-right direction of the sheet-like portion and has a water permeability higher than that of the sheet-like portion (eighth embodiment).

According to the swimming fin according to the first embodiment of the present invention, a lightweight swimming fin is realized, and handling is convenient.

According to the swimming fin according to the second embodiment of the present invention, the rod-shaped body can be expanded and contracted. Therefore, if the rod-shaped body is contracted, the swimming fin is carried or when walking on the land. It is convenient without the sheet-like part getting in the way.

According to the swimming fin according to the third embodiment of the present invention, the rod-shaped body can be rotated and folded. Therefore, if the rod-shaped body is folded, it is convenient for carrying.

According to the swimming fin according to the fourth embodiment of the present invention, the rod-shaped body can be rotated and folded while the swimming fin is mounted on the user's foot, so the rod-shaped body is folded. If this is done, it is convenient without the sheet-like part getting in the way when walking on land.

According to the swimming fin according to the fifth embodiment of the present invention, since the fixing portion has the shoe-like body that accommodates the user's foot, it is easy to attach the swimming fin to the user's foot.

According to the swimming fin according to the sixth embodiment of the present invention, the sheet-like portion can be expanded beyond the angle formed by the inner side and the outer side surface of the foot (shoe), and thus a greater driving force is obtained. be able to.

According to the swimming fin according to the seventh embodiment of the present invention, the left and right positions of the rod-shaped bodies arranged in the front-rear direction are fixed, and these rod-shaped bodies spread in the left-right direction more than necessary, or when swimming A stable propulsive force can be obtained without being narrowed in the left-right direction more than necessary due to the force of water.

According to the swimming fin according to the seventh embodiment of the present invention, it is possible to prevent the sheet-like portion from being twisted or kinked due to excessive force applied to the sheet-like portion during swimming, so that a stable propulsive force can be obtained. Obtainable.

FIG. 1A is an external view of a swimming fin according to a first embodiment of the present invention as viewed obliquely from above. FIG. 1B is an external view of the swimming fin according to the first embodiment of the present invention as viewed from below. FIG. 1C is an external view of the swimming fin according to the first embodiment of the present invention as viewed from above. FIG. 2A is a diagram (a diagram seen from the side) showing a positional relationship between a user's foot and a rod-like body in a state in which the swimming fin according to the present invention is mounted. FIG. 2B is a diagram (a diagram viewed from the front) showing the positional relationship between the user's foot and the rod-like body in a state where the swimming fin according to the present invention is mounted. FIG. 3A is a schematic external view of a swimming fin according to a second embodiment of the present invention. FIG. 3B is a schematic cross-sectional view of the swimming fin according to the second embodiment of the present invention. FIG. 4 is a schematic external view of a swimming fin according to a third embodiment of the present invention. FIG. 5 is a schematic external view of a swimming fin according to a modification of the present invention.

(First embodiment)
Hereinafter, a first embodiment which is a specific example of the present invention will be described with reference to the drawings.

FIG. 1A is an external view of the swimming fin 1 according to this embodiment as viewed obliquely from above. Moreover, FIG. 1B is the external view which looked at the fin 1 for swimming concerning a present Example from the downward direction. However, in FIG. 1A and FIG. 1B, in addition to the swimming fins 1, shoes to which the swimming fins 1 are attached are also shown for easy understanding.

Although the swimming fin 1 may be directly attached to the user's foot, when the swimming fin 1 is fixed to the user's foot, the user feels pain in the foot because the foot is tightened by the fixing portion 13 described later. There are many cases. Therefore, it is common for the user to wear the swimming fin 1 on the shoe while wearing the shoe on the foot. In the following description, they are expressed as “attached to the foot” without distinguishing whether the fin 1 for swimming is directly attached to the foot or attached to the foot through shoes.

The swimming fin 1 includes a sheet-like portion 11, six rod-like bodies 12, and a fixing portion 13.

The sheet-like portion 11 is a portion that generates propulsive force by applying pressure to the water during swimming.

The shape of the sheet-like portion 11 has an elongated, substantially rectangular shape when not attached to the user's foot.

The size of the sheet-like portion 11 is, for example, 45 centimeters when the length of the user's foot in the front-rear direction (hereinafter referred to as “vertical direction”) is worn on the user's foot. In this case, the length of the user's foot in the left-right direction (hereinafter referred to as “lateral direction”) is, for example, 15 centimeters at the maximum. Moreover, the thickness of the sheet-like part 11 is 5 millimeters, for example.

The material of the sheet-like portion 11 is preferably a vinyl chloride resin having flexibility and water resistance, for example. Vinyl chloride resin is one of the common synthetic resins, and it can be made hard or soft by adding plasticizer, and it has excellent water resistance, acid resistance, alkali resistance, solvent resistance, flame resistance, electricity Has insulation properties. In addition, vinyl chloride resin has a wide range of uses because of its very low price. Therefore, the vinyl chloride resin has properties suitable for the swimming fin 1 and contributes to lowering the manufacturing cost.

Each of the rod-like bodies 12 is arranged along the vertical direction in a state of being fixed to the user's foot by the fixing portion 13, supports the sheet-like portion 11, and maintains the sheet-like portion 11 in the shape of a so-called swimming fin. . As shown in FIG. 1B, each of the rod-like bodies 12 is positioned at a predetermined location of the sheet-like portion 11 by sewing.

Each shape of the rod-shaped body 12 is, for example, an elongated cylindrical shape.

The size of each of the rod-shaped bodies 12 is, for example, that the length in the longitudinal direction (that is, the longitudinal direction) is 55 centimeters for the left and right end portions in the lateral direction of the sheet-like portion 11, that is, the two arranged outside. And its thickness (diameter) is 6 millimeters. Regarding the four pieces arranged on the inner side other than the left and right end portions in the lateral direction of the sheet-like portion 11, the length in the longitudinal direction is 45 centimeters and the thickness (diameter) thereof is 4 millimeters.

In addition, the thickness of a portion of, for example, 10 centimeters from the tip end on the toe side in the longitudinal direction of the rod-shaped body 12 is, for example, 4 mm for the two rod-shaped bodies 12 arranged on the outside, and about 4 pieces arranged on the inside You may make it thin compared with the thickness of those heel sides like 2.5 millimeters. In that case, the bending of the swimming fin 1 during swimming is improved, and a propulsive force during swimming can be efficiently generated.

Also, the material of the rod-like body 12 is preferably, for example, a hard synthetic resin or FRP having strong elasticity. FRP is a fiber reinforced plastic (Fiber Reinforced Plastics), which is a composite material in which fibers such as glass fiber are put in a plastic to improve the strength.

FIG. 1C is an external view of the swimming fin 1 that is not worn on the user's foot as seen from above. As shown in FIG. 1C, two of the rod-like bodies 12 on the outside protrude from the sheet-like portion 11 to the user's heel side by about 10 cm. However, the two protruding portions are covered with the same material as the sheet-like portion 11 so as not to be exposed to the outside.

The fixing unit 13 fixes each of the rod-like bodies 12 directly or via the sheet-like portion 11 to the user's foot.

The fixing unit 13 includes, for example, a first fixing means 131, a second fixing means 132, and a third fixing means 133.

The first fixing means 131 includes, for example, four D-cans 1311 shown in FIG. 1C, one nylon grosgrain tape 1312, and two foots 1313.

One D can 1311 is arranged for each of the two outer sides of the rod-like body 12, one near the heel side end of the rod-like body 12 and one near the root protruding from the sheet-like portion 11 to the heel side. Yes. Each of the D cans 1311 is sewn to the rod-shaped body 12 such that a straight portion thereof extends along the rod-shaped body 12 and a curved portion can protrude upward from the rod-shaped body 12.

The grosgrain tape 1312 is sequentially passed through the inside of each of the four D cans 1311 described above, so that the X shape and the upper and lower bases of the X shape are connected as a whole. A foot 1313 is arranged on each of the two lines constituting the X-shape of the grosgrain tape 1312. The user uses these foots 1313 to adjust the length of the grosgrain tape 1312 so that the first fixed Tightening by means 131 can be performed.

The second fixing means 132 has, for example, one nylon grosgrain tape 1321 and one foot 1322 disposed on the grosgrain tape 1321.

One end of the grosgrain tape 1321 is fixed to one of the two D cans 1311 on the heel side by stitching.

The other end of the grosgrain tape 1321 that is different from the above-mentioned one end passes through the foot 1322 and passes through the inside of the other D can 1311 that is different from the above-mentioned one of the two D cans 1311 on the heel side. It is arranged so as to be inserted into the same footjob 1322 again. The user can perform tightening by the second fixing means 132 by adjusting the length of the grosgrain tape 1321 using the foot 1322 disposed on the grosgrain tape 1321 as described above.

The third fixing means 133 has, for example, two nylon surface fastener tapes 1331 and two square cans 1332. Each of the square cans 1332 is sewn to the lower side of the D can 1311 at substantially the same position as each of the right two of the four D cans 1311.

One end of each of the hook-and-loop fastener tape 1331 is connected to two left D-shaped straight portions of the D can 1311 by stitching.

Each of the hook-and-loop fastener tapes 1331 has, for example, a loop surface on the upper side in FIG. 1C which is approximately half of the side connected to the D can 1311, and FIG. 1C which is approximately half of the side not connected to the D can 1311. A hook surface is provided on the upper side surface.

Using the third fixing means 133 having such a configuration, the user pulls the hook-and-loop fastener tape 1331 from the left side to the right side on the back side of the sheet-like portion 11 as shown in FIG. Is tightened by engaging the hook surface of the hook-and-loop fastener tape 1331 and the loop surface while pulling from the right side to the left side so as to return to the original direction (D can 1311 side). be able to.

Each of the surface fastener tape 1331 shown in FIGS. 1A to 1C is provided with a loop surface and a hook surface only on one side (on the upper side surface in FIG. 1C). A loop surface and a hook surface may be provided on each of both surfaces.

By having such a configuration, in a state where the user's foot is tightened with the grosgrain tape 1321 and the grosgrain tape 1312, the engagement between each loop surface of the hook-and-loop fastener tape 1331 and the hook surface is released, and the hook-and-loop fastener tape 1331. Is pulled out from the square can 1332, the sheet-like portion 11 is lifted upward toward the user's other shin (front surface of the foot), and is placed along the other shin, and the hook-and-loop fastener tape 1331 is again attached to the square can 1332. The sheet-like portion 11 can be firmly fixed to the other shin by engaging the loop surface and the hook surface while pulling the hook-and-loop tape 1331.

When the user fixes the sheet-like part 11 to the shin on the other side in this way, it is convenient that the swimming fin 1 does not get in the way when walking on land or the like.

By the way, in this case, the hook surface and the loop surface that are engaged with each other when the sheet-like portion 11 is fixed on the sole of the foot and the surface where the sheet-like portion 11 is fixed on the far shin are mutually related. It is different from the surface on which the hook surface and the loop surface to be joined are arranged. Therefore, as described above, the hook surface and the loop surface are disposed on both surfaces of the surface fastener tape 1331.

Instead of the configuration in which the hook surface and the loop surface are provided on both surfaces of the hook-and-loop fastener tape 1331 as described above, a rotary can having a structure in which two square cans are connected to be rotatable about an axis is used instead of the square can 1332. Thus, a configuration in which the hook surface and the loop surface are provided only on one surface of the hook-and-loop fastener tape 1331 may be employed. According to such a configuration, the user rotates the hook-and-loop fastener tape 1331 around the axis of the rotary can and reverses the front and back as necessary, so that the hook surface and the loop surface arranged only on one side face can be It can be used both when fixed on the back of the chin and when fixed on the shin.

The size of the D can 1311 is, for example, a string width of 3 cm and a line thickness of 4 mm. The material of the D can 1311 is, for example, nickel plated with silver.

The size of the square can 1332 is, for example, a string width of 3 cm, a width perpendicular to the string width of 2.5 cm, and a line thickness of 4 mm. The material of the square can 1332 is, for example, nickel plated with silver.

The sizes of the grosgrain tape 1312 and the grosgrain tape 1321 are, for example, a lateral width of 2.5 centimeters, a thickness of 3 millimeters, and a longitudinal length having a predetermined length suitable for fastening. .

KOKI 1313 and KOKI 1322 have a shape in which a single rod-shaped portion is arranged in a substantially rectangular frame so as to cross the frame. The foot 1313 and the foot 1322 have, for example, a size that allows a tape having a width of 2.5 centimeters and a thickness of 3 millimeters to pass through twice, and tightening or loosening by shifting the double portion. Is possible. The material of the foot 1313 and the foot 1322 is, for example, nickel plated with silver.

The size of the swimming fin 1 is, for example, a length of 55 centimeters in a state where the fin 1 is attached to the user's foot, and the length in the lateral direction is from the end portion of the user's heel side to the toe side. It changes so that it may spread from 10 centimeters to 15 centimeters toward the end part.

When the user puts the swimming fin 1 on his / her foot, the user passes the tip of the foot through a ring constituted by the heel portion of the grosgrain tape 1312 and the grosgrain tape 1321, and the grosgrain tape 1321 and the sheet-like portion 11 are on the instep Get on the top and pull the entire swimming fins 1 in the heel direction so that the ankles of the feet are in the ring. In this state, the lengths of the grosgrain tape 1312 and the grosgrain tape 1321 are adjusted by pulling the tips of the grosgrain tape 1312 near the foot 1313 and the grosgrain tape 1321 near the foot 1322. Thereafter, as shown in FIG. 1B, tightening is performed by engaging each of the two hook-and-loop tapes 1331 while pulling them. As a result, the swimming fin 1 is firmly attached to the user's foot.

When the swimming fin 1 is firmly fixed to the user's foot as described above, the vicinity of the tip of the swimming fin 1 is curved so as to protrude downward with respect to the back surface of the foot. The mechanism will be described below with reference to the drawings.

FIG. 2A and FIG. 2B are views showing the positional relationship between the user's feet and the rod-like body 12 in a state where the swimming fin 1 is mounted. FIG. 2A shows the user's foot and the rod-shaped body 12 from the side, and FIG.

2A and 2B, out of a total of six rod-like bodies 12, two outside are shown as rod-like bodies 12e and four inside are shown as rod-like bodies 12i. The rod-shaped body 12e extends further forward from the vicinity of the toe of the foot so as to be substantially parallel to the back surface of the foot along the side surface of the foot. On the other hand, the rod-shaped body 12i extends further forward from the vicinity of the toe of the foot so as to go to the lower side of the sole of the foot along the instep. As a result, the line connecting the front ends of the rod-shaped body 12e and the rod-shaped body 12i that are adjacent to each other is generally linear, or protrudes downward from the back of the foot (that is, concave upward) in the middle in the left-right direction as shown in FIG. 2B. It will be curved like this.

The shape of the fin 1 for swimming is curved upward and convex with respect to the back of the foot at the instep portion, but is generally curved or convex downward as described above in the region on the tip side. For this reason, when the user swings his / her leg down during swimming, the sheet-like portion 11 firmly holds the water, and a propulsive force as a reaction force of the force of the user's leg can be efficiently obtained.

(Second embodiment)
Hereinafter, a second embodiment which is a specific example of the present invention, which is different from the first embodiment, will be described with reference to the drawings.

In the following description, differences from the first embodiment will be mainly described, and common elements will be denoted by the same reference numerals.

FIG. 3A is a schematic view of the swimming fin 2 according to the second embodiment as viewed from above. FIG. 3B is a cross-sectional view taken along the line AA for explaining the structure of the fin 2 for swimming. However, in FIG. 3B, the sheet-like portion 11 is not shown for easy understanding of the description.

As shown in FIG. 3B, the swimming fin 2 can expand and contract or fold the rod-like body 22 in the longitudinal direction (that is, the longitudinal direction). This will be described later.

The fixing unit 23 has a shoe shape that accommodates the user's bare feet. More specifically, the fixing portion 23 has a hollow shape having an opening for allowing the user's bare feet to be inserted, and the bare feet of the user inserted through the openings are fitted therein. It has a shape that covers from the outside.

In addition, the material of the fixing | fixed part 23 is the material similar to the sheet-like part 11, ie, a vinyl chloride resin, for example.

As the rod-like body 22, only the outer two are provided in consideration of ease of expansion / contraction in the vertical direction or folding.

These rod-shaped bodies 22 include an outer rod-shaped body 221 that is a hollow rod-shaped body, and an inner rod-shaped body 222 that is a rod-shaped body that is housed in a hollow portion of the outer rod-shaped body 221 so as to be retractable. When the outer rod-shaped body 221 is accommodated in the outer rod-shaped body 221, the inner rod-shaped body 222 is pulled out from the outer rod-shaped body 221 and is elongated in the vertical direction. The outer rod-shaped body 221 and the inner rod-shaped body 222 are, for example, a telescopic fishing rod. For example, a flange provided so as to protrude outward at the end of the inner rod-shaped body 222 is provided at the end of the outer rod-shaped body 221. The inner rod-shaped body 222 is prevented from falling off from the outer rod-shaped body 221.

In the state where the inner rod-shaped body 222 is fully accommodated in the outer rod-shaped body 221, a part of the sheet-like portion 11 near the inner rod-shaped body 222 is gathered in a draped shape and the user of the outer rod-shaped body 221 is placed. It is held near the tip on the toe side.

When swimming, etc., the inner rod-like body 222 is used with being pulled out from the outer rod-like body 221 to the maximum extent. In order to prevent the state from becoming unstable, in contact with the outer rod-like body 221 of the inner rod-like body 222 in the state where the inner rod-like body 222 is pulled out from the outer rod-like body 221 to the maximum extent. A latch 2221 is provided around the portion. In a state in which the inner bar 222 is pulled out from the outer bar 221 to the maximum extent, the head of the latch 2221 protrudes outward from the inner bar 222 and hooks to the end of the outer bar 221, thereby causing the inner bar 222 to move. It is prevented from being pushed back to the inside of the outer rod-shaped body 221.

Therefore, when the inner rod 222 is to be stored in the outer rod 221 from the state in which the inner rod 222 is pulled out from the outer rod 221, the user pushes the head of the latch 2221 while pressing the head of the latch 2221. Each of the inner rod-like bodies 222 may be pushed into each of the two outer rod-like bodies 221.

Also, each of the left and right outer rod-like bodies 221 is constituted by a rear-side rod-like body 2211 and a front-side rod-like body 2212 that are connected to each other in the vicinity of the toes of the foot in the vertical direction. The connection allows the front rod-like body 2212 to rotate so as to jump up with respect to the rear-side rod-like body 2211, and the user folds the left and right outer rod-like bodies 221 at the connection portion, thereby swimming fins. 2 can be folded in the longitudinal direction.

More specifically, as shown in FIG. 3B, the front bar 2212 is provided so as to penetrate in the lateral direction near the toe of the fixing part 23 with respect to the rear bar 2211 fixed to the fixing part 13. The rotating shaft structure 2213 is connected. As a result, the front rod-like body 2212 can rotate upward around the central axis of the rotating shaft structure 2213.

However, a pawl mechanism (not shown) is provided on the outer bar 221 so that the front bar 2212 does not rotate downward around the central axis of the rotating shaft structure 2213 with respect to the rear bar 2211. If the downward rotation is allowed, the sheet-like portion 11 is not supported by the rod-like body 22 during swimming, and a propulsive force cannot be obtained.

In addition, each of the outer rod-like bodies 221 can be folded in a state where the user's feet are housed in the fixing portion 23. In the state where each of the outer rod-like bodies 221 is folded, the user can be on a sand beach or the like. It is possible to walk.

The rod-shaped body 22 needs to have a strength of a predetermined level or more for convenience of storage and folding. Therefore, the rod-like body 22 in the swimming fin 2 must be relatively thicker than the rod-like body 12 in the swimming fin 1. More specifically, the outer rod-shaped body 221 has a length in the longitudinal direction (that is, the longitudinal direction) of 30 centimeters and a thickness (that is, a length in a direction perpendicular to the longitudinal direction) of 6 mm. . Further, the outer rod-shaped body 221 has a hollow cylindrical shape, and its wall thickness is 0.9 mm.

In contrast, the inner rod-like body 222 has a length of 15 centimeters in the longitudinal direction and a thickness of 4 millimeters, and has a cylindrical shape as a whole.

As the material of the rod-shaped body 22, for example, carbon fiber or glass fiber is suitable for reasons of strength.

When the swimming fin 2 is attached to the user's foot, for example, the vertical length is 55 centimeters when the maximum length is extended in the vertical direction, and the horizontal length is the user's heel. It spreads from 10 centimeters to 15 centimeters from the end portion on the side toward the tip of the toe side.

Further, when the inner rod-shaped body 222 is housed in the outer rod-shaped body 221 as much as possible, the length of the swimming fin 2 in the vertical direction is reduced by 12 centimeters to 43 centimeters. From this state, when the front rod-like body 2212 of the outer rod-like body 221 is turned so as to stand in front of the user's shin with the rotation shaft structure 24 as the central axis, the total length in the vertical direction of the swimming fin 2 is 30 cm. It becomes. In this state, the front bar 2212 of the outer bar 221 that houses the inner bar 222 is erected substantially vertically from the ground.

Hereinafter, a state in which the inner rod 222 is extended from the outer rod 221 to the maximum and the rear rod 2211 and the front rod 2212 are substantially straight is referred to as a “first position”. A state in which the stored front bar-shaped body 2212 stands substantially vertically from the ground is referred to as a “second position”.

The transition between the first position and the second position can be performed even with the swimming fin 2 attached to the user's foot.

In a state where the swimming fin 2 is not attached to the user's foot, the front rod-like body 2212 can be further rotated from the second position so as to be tilted toward the fixed portion 23 side. This state is called “third position”.

Since the swimming fin 2 according to the second embodiment has the above-described configuration, the user is in the first position when swimming, and in the second position when walking on a sandy beach, the swimming fin. When removing 2 from the foot and carrying it, the swimming fins 2 are appropriately deformed to the third position to facilitate handling.

(Third embodiment)
Hereinafter, a third embodiment, which is one specific example of the present invention, different from the first and second embodiments will be described with reference to the drawings.

In the following description, differences from the first and second embodiments will be mainly described, and common elements will be denoted by the same reference numerals.

FIG. 4 is a schematic view of the swimming fin 3 according to the third embodiment as viewed from above.

Generally, it is preferable that the swimming fin has a shape in which the lateral length increases as it goes toward the user's toe. In the swimming fin 1 and the swimming fin 2 according to the first and second embodiments, the extent of the spread is fixed so as to be along the inner side surface and the outer side surface of the user's foot (shoe). It is naturally determined by the angle formed by the rod-shaped body 12 or the rod-shaped body 22. Therefore, there is a possibility that a desired degree of spread cannot be ensured and sufficient driving force cannot be obtained.

In order to solve the above problem, the swimming fin 3 has two pedestals 34 and an extended rod-like body 35. In addition, the swimming fin 3 does not have the four inner rod-like bodies 12 included in the swimming fin 1 but has only two outer rod-like bodies 12.

The pedestal 34 is, for example, a triangular prism-shaped rubber block. As shown in FIG. 4, the pedestal 34 has two rod-like shapes so as to be positioned on both sides near the tip on the toe side of the user's foot (ie, shoe) when worn. Secured on the inner side of each of the bodies 12. In this way, the pedestal 34 disposed between the side surface of the foot (that is, the shoe) and the rod-shaped body 12 has an angle formed by the two rod-shaped bodies 12 more than the angle formed by the right side surface and the left side surface of the shoe. Also plays a role to expand.

That is, the rod-shaped body 12 is fixed on the side surface of the shoe via the pedestal 34, so that the rod-shaped body 12 spreads more than the case where the pedestal 34 is not used, and the sheet-like portion 11 can obtain a sufficient driving force. . More specifically, the width of the tip of the toe side of the swimming fin 1 without the pedestal 34 is 15 centimeters, whereas the width of the tip of the toe side of the user of the swimming fin 3 is, for example, 30 centimeters. Meter.

The expansion rod-like body 35 connects the two rod-like bodies 12 biased so as to spread outward by the pedestal 34 in the left-right direction, thereby preventing the rod-like bodies 12 from spreading too much and swimming the user. By preventing the two rod-like bodies 12 from being narrowed by the force applied to the sheet-like portion 11, it serves to prevent a reduction in propulsive force.

One end of the extended rod-shaped body 35 is rotatable to the rod-shaped body 12 through the rotation member 36 at a position of, for example, 8 cm from the tip of the right-side rod-shaped body 12 toward the heel side of the user. It is connected. The rotation member 36 is a member that enables rotation around an axis, for example, which is widely employed in the joint portion of an umbrella. The expansion rod-shaped body 35 can freely rotate on the plane including the two rod-shaped bodies 12 around the axis of the rotation member 36.

The other end different from the above-mentioned one end of the extended rod-shaped body 35 is, for example, at a position of 8 cm from the tip of the left-side rod-shaped body 12 toward the heel side of the user via the locking member 37. It can be locked to the rod-shaped body 12. The locking member 37 has, for example, a pin attached to the upper side of the rod-like body 12 and a hook provided at the other end of the extension rod-like body 35, and the pin and the hook are engaged with each other to expand the pin. The rod-shaped body 35 is locked to the rod-shaped body 12.

The user uses the extended rod-shaped body 35 while swimming with the rod-shaped body 12 by the locking member 37 and maintaining the expanded shape of the sheet-like portion 11 during swimming. On the other hand, when not in use, after the locking by the locking member 37 is released, the expansion rod-shaped body 35 is rotated around the axis of the rotation member 36 to be along the rod-shaped body 12 and, if necessary, the swimming fin 3 Fold sideways. Thereby, the fin 3 for swimming becomes compact, and it is convenient in carrying etc.

(Modification)
The embodiments described above can be variously modified within the scope of the technical idea of the present invention.

For example, in the second embodiment, the shoe-shaped structure of the fixing portion 23, the expansion / contraction means of the rod-shaped body 22, the folding means of the rod-shaped body 22, etc. are adopted, but it is not necessary to employ all of them at the same time. Any one or more of them may be selectively employed.

Further, the rotating shaft structure 2213 employed in the second embodiment is configured so as to cross the left and right outer rod-shaped bodies 221. However, if sufficient strength can be secured, the left and right outer rod-shaped bodies 221 are arranged. For each of the above, a mechanism may be employed in which the rear bar 2211 and the front bar 2212 are rotatably connected. Then, since there is no member which crosses the right and left of the sheet-like part 11, it is possible to fold and combine the fins 2 for swimming more compactly.

Also, the numerical values indicating the shape, size, number, etc. of each element in the above-described embodiments are merely examples, and other numerical values may be adopted if there is no particular problem. For example, the longitudinal and lateral lengths of the sheet-like portion 11 can be variously changed according to the user's physique and the required driving force. Further, for example, the number of the rod-like bodies 12 in the first embodiment is six, but these numbers are also design matters.

In addition, the material of each element in the above-described embodiment is merely an example, and other materials may be adopted if there is no particular problem. For example, the sheet-like member 11 may be made of a material other than vinyl chloride resin (for example, rubber), and the rod-like body 12 is made of a material other than FRP, carbon fiber, or glass fiber (for example, stainless steel). Alternatively, the grosgrain tape 1312 and the grosgrain tape 1321 may be made of a material other than nylon (for example, cotton cloth).

Further, the fixing portion 13 may perform the above-described function by means other than the first fixing means 131, the second fixing means 132, and the third fixing means 133 unless there is a particular problem. One example is the shoe-shaped structure of the fixing portion 23 of the second embodiment.

In the first embodiment described above, two hook-and-loop tapes 1331 each having a loop surface and a hook surface approximately arranged on one side are attached to two D cans 1311 on the left side. A configuration is adopted in which the loop surface and the hook surface are engaged with each other by turning the tape 1331 through the square can 1332 and then turning back.

Instead of this, for example, two hook-and-loop tapes with only a loop surface on one side are respectively attached to the two left D cans 1311, and two hook-and-loop tapes with only a hook surface on one side are attached to the right side. The structure which attaches to each of the two D cans 1311 and engages the loop surface and the hook surface of the hook-and-loop tape arranged on the left and right sides thereof may be adopted. According to such a configuration, it is possible to achieve tightening by engaging the loop surface and the hook surface both on the back surface of the shoe and around the user's calf without using a rotating can or the like.

Further, the pedestal 34 and the extended rod-shaped body 35 described in the third embodiment may not necessarily be employed at the same time. For example, only the pedestal 34 or only the expanded rod-shaped body 35 may be employed.

In the above-described embodiment, as shown in FIG. 5, the mesh portion 14 is formed in a substantially triangular region that narrows from the end on the toe side toward the heel side at a substantially central position in the left-right direction of the sheet-like portion 11. The structure which arrange | positions may be employ | adopted. The mesh part 14 is a mesh material having higher water permeability than the sheet-like part 11 disposed around the mesh part 14. In FIG. 5, the illustration of the inner rod-like body 12 is omitted for easy understanding.

By arranging the mesh part 14 inside the sheet-like part 11, when the user swings his / her foot down during swimming, an appropriate amount of water passes through the mesh part 14 so that excessive pressure is applied to the swimming fin 1. Is prevented, and the sheet-like portion 11 is not twisted or twisted inappropriately. As a result, the user can efficiently obtain a driving force.

In addition, the usage method of the swimming fin 1, the swimming fin 2, and the swimming fin 3 in the above-described embodiment is merely an example, and these may be used by any other method if there is no particular problem. For example, the user can use the sandy beach while wearing the swimming fin 2 on the foot while the sheet-like portion 11 is stretched without using the expansion and contraction means and the rotation means of the rod-like body 22 of the swimming fin 2 according to the second embodiment. You may walk on the top.

In addition, although the rod-like body 12 and the rod-like body 22 in the above-described embodiment are linear rods, the present invention is not limited thereto. For example, in the swimming fin 1 in the first embodiment, in order to ensure the necessary spread of the sheet-like portion 11, the outer rod-like body 12 is bent or bent outward near the toe of the user's toe, In order to make the angle of the sheet-like part 11 with respect to water appropriate, the outer rod-like body 12 may be bent or bent downward near the toe of the user's foot.

Further, in the swimming fin 1 in the first embodiment described above, on the ground contact surface (surface opposite to the side where the hook surface is disposed) of the hook-and-loop fastener tape 1331 in a state where the swimming fin 1 is attached to the foot. Anti-slip processing such as rubber coating may be applied. By doing so, for example, the risk of slipping when the user walks on the poolside with the swimming fins 1 mounted is reduced, which is desirable.

The swimming fins of the present invention have the advantages of being easy to use and light in weight when diving and the like, and can be manufactured and sold in large numbers, so that they can be used in service industries such as so-called manufacturing and retailing.

DESCRIPTION OF SYMBOLS 1 ... Swimming fin, 11 ... Sheet-like part, 12 ... Rod-shaped body, 13 ... Fixing part, 131 ... 1st fixing means, 1311 ... D can, 1312 ... Grosgrain tape, 1313 ... Footjob, 132 ... 2nd fixing Means, 1321 ... Grosgrain tape, 1322 ... Foot, 133 ... Third fixing means, 1331 ... Hook fastener tape, 1332 ... Square can, 14 ... Mesh part, 2 ... Swimming fin, 22 ... Rod-like body, 221 ... Outside rod-like Body, 2211 ... Rear rod-like body, 2212 ... Front-side rod-like body, 2213 ... Rotating shaft structure, 222 ... Inside rod-like body, 2221 ... Latch, 23 ... Fixed part, 3 ... Swimming fin, 34 ... Base, 35 ... Expansion rod-like Body, 36 ... Rotating member, 37 ... Locking member

Claims

A sheet-like part;
Two or more rods,
A fixing part for fixing the two or more rod-like bodies to a user's foot directly or via the sheet-like part,
Each of the two or more rod-shaped bodies is arranged along the front-rear direction of the user's foot in a state of being fixed to the user's foot by the fixing portion,
The two or more rod-shaped bodies are swim fins that maintain the sheet-like portion in the shape of a swimming fin in a state of being fixed to the user's foot directly or via the sheet-like portion by the fixing portion.
Each of the two or more rod-shaped bodies has an outer rod-shaped body that is a hollow rod-shaped body and an inner rod-shaped body that is a rod-shaped body that is accommodated in a hollow portion of the outer rod-shaped body. The swimming fin according to claim 1, wherein the fin is contracted in the longitudinal direction by being stored in the outer rod-shaped body.
Each of the two or more rod-shaped bodies has two or more rod-shaped bodies that are rotatably connected to each other, and one of the two or more rod-shaped bodies is the other rod-shaped body at the connected portion. The swimming fin according to claim 1, wherein the fin can be folded in a longitudinal direction by rotating with respect to.
The two or more rod-shaped bodies can be folded in a state where the two or more rod-shaped bodies are fixed to the user's foot by the fixing portion. In the state where the two or more rod-shaped bodies are folded, the user can The swimming fin according to claim 3, wherein the fin is capable of walking.
The swimming fin according to claim 1, wherein the fixing portion includes a shoe-like body that accommodates the user's foot.
One of the two or more rod-shaped bodies is disposed on the inner side surface of the user's foot, and the other of the two or more rod-shaped bodies is different from the one rod-shaped body. On the outer side of the
Left-right direction of the sheet-like portion disposed between at least one of the one rod-shaped body and the inner side surface of the user's foot and between the other rod-shaped body and the outer side surface of the user's foot. The swimming fin according to claim 1, further comprising a pedestal for facilitating the spread of the swimming.
The swimming body according to any one of claims 1 to 6, further comprising a rod-shaped body that traverses at least two rod-shaped bodies of the two or more rod-shaped bodies in the left-right direction and positions the at least two rod-shaped bodies in the left-right direction. fin.
The swimming fin according to any one of claims 1 to 7, further comprising a mesh portion that is disposed at a middle position in a left-right direction of the sheet-like portion and has higher water permeability than the sheet-like portion.