JPH0715560Y2 - Reinforced plastic fins Swimming fins - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is used for reinforced plastic fins for swimming fins, more specifically for fins swimming competition in which both feet are kicked simultaneously in a swimming competition. The present invention relates to a fin for fin swimming, which is formed of a reinforced plastic and is successively thinned toward a wide tip.

(Prior Art and Problems Thereof) Conventionally, as a fin of this type, for example, there is one described in Japanese Utility Model Laid-Open No. 61-26556, which is formed of a reinforced plastic into a generally fan shape with a wide tip. In addition, the surface is stepped so as to become thinner gradually toward the wide tip, and the boundary edge of each step is formed linearly.

By the way, this fin for swimming is different from ordinary fins that wear one leg at a time, and both legs are inserted and fixed in the foot rests provided on one fin, and the fin is bent like a dolphin. The propulsive force is obtained by a so-called dolphin kick that moves the head up and down, and the swimming force is several times different as compared with the case of using the usual flippers.

However, in the above-described conventional fin for swimming, since the boundary edge of each step portion formed in the surface step shape so as to become gradually thinner toward the wide tip is formed linearly. Not only is the resistance at the time of kicking great and it is hard to kick it down, but there are no ribs on either side of the fins to prevent deformation. It is difficult to catch water properly because it is easy to bend, so it requires considerable skill until it can be used properly and reliable propulsion can be obtained, and it is good for beginners etc. There was a problem that it was not balanced and the usability was poor.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to unbalance the left and right fins (in the lateral direction) during use. It is to provide fins for fin swimming that have less resistance when kicking while suppressing deflection.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the technical means of the present invention is to apply a resin to a plurality of reinforcing members of the same shape made of fiber woven cloth alternately and defoam them. After thickening and laminating, the thickened ribs with the same width and the same height are left and right on the left and right of the reinforced plastic laminated original plate that has been cut out in a fan shape with a wide tip after it is hardened. And stepwise thin-walled molding, and each step boundary edge is curved with a curved surface bulging toward the narrow base end side.

(Operation) By the technical means described above, the boundary edge of each step is curved with a curved surface that bulges toward the narrow base end side, so that the blade portion between the ribs on both sides can be easily deformed and made of hard reinforced plastic. The fins for swimming have less resistance when kicking, and the thick ribs on both sides suppress lateral bending.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The fin (A) is formed by alternately stacking the reinforcing material (1) and the resin (2) in sequence.

The reinforcing material (1) is made of fiber woven fabric such as glass fiber, synthetic fiber, carbon fiber, ultra-stretched polyethylene fiber, etc., and the number of laminated layers (6 sheets in the illustrated example) according to the leg force difference of each user. , The normal stacking range is 2 to 20 sheets).

On the other hand, the resin (2) is, for example, an unsaturated polyester resin,
Thermosetting resin for low-pressure lamination such as epoxy resin and low-voltage phenol resin should be used. It is also possible to add a curing agent, an accelerator, a pigment, etc., if necessary.

First, a reinforcing material (1) cut into the same shape is prepared, for example, a required number of glass fiber woven cloths cut into about 1 m square are prepared, and the reinforcing material (1) is filled with a resin (2) such as unsaturated polyester. Repeating the work of applying and permeating with a roller and expelling air bubbles (defoaming) multiple times to stack the same shape of reinforcing material (1) ... stack the required number of sheets and finally attach a mylar sheet (not shown) etc. To do.

Then, it is left standing at room temperature or in a heated state for a required time to be cured, and a flat laminate having a required thickness with the upper and lower surfaces being resin (2) and (2) surfaces is formed.

The flat laminated body is provided with a narrow base end portion (a ′) serving as a foot insertion portion (not shown) fixing surface at the rear by using, for example, a cut grinder, etc. When it is cut out and deburred on the peripheral edge, it is flat and has a wide tip, and is a substantially fan-shaped laminated reinforced plastic original plate (a).
Is molded.

Then, for example, on the upper surface (a ₁ ) of the original plate (a), the narrow base end portion is extended to an arbitrary point (a ₂ ′) (a ₂ ′) near both corners of the wide tip portion (a ₂ ). (A ') Toward the vicinity of the original plate (a)
While providing thick ribs (a ₃ ) (a ₃ ) on both the left and right sides of the same thickness with the same width and the same height, make a notch (a ₄ ) with a required partition and the notch (a ₄ ), The necessary number of the reinforcing materials (1) ... Is peeled off within the range of the cutting depth (for example, 1 to 3 of the reinforcing materials (1) ...) Over the wide tip portion (a ₂ ).

Then, the plane is substantially inverted U, which is one step lower than the upper surface (a ₁ ).
A step portion (a ₅ ) having a character shape is formed between the left and right thick ribs (a ₃ ) (a ₃ ).

Subsequently, then while leaving the stepped portion rear part of (a ₅₎ the (a ₅ ') in the required range, a narrower section than stepped portion (a ₅₎ on the stepped portion (a _5), and the width A notch (a ₆ ) is made with a curved surface that bulges toward the narrow base end (a ′) side, and a reinforcing material (1) extends along the tip (a ₂ ) along the notch (a ₆ ).
When the required number of sheets are peeled off, a step portion (a ₇ ) that is one step lower than the step portion (a ₅ ) is formed.

Then, after that, the above steps are repeated while making the cuts (a ₁₀ ) (a ₁₁ ) (a ₁₂ ) into sections narrower than the latest step with a curved surface swelling toward the narrow base end (a ′) side. , A plurality of step portions (a ₈ ) (a ₉ ) are formed between the left and right thick ribs (a ₃ ) (a ₃ ) toward the wide tip portion (a ₂ ) side, and the step portion has a thin wall shape. The fin (A) is formed.

Therefore, as described above, cut (a ₆ ) (a ₁₀ ) (a ₁₁ )
When (a ₁₂ ) is inserted to form steps (a ₅ ) (a ₇ ) (a ₈ ) (a ₉ ) ... each step (a ₅ ) (a ₇ ) (a ₈ ) ... The boundary edges (a ₆ ′) (a ₁₀ ′) (a ₁₁ ′) (a ₁₂ ′) are curved with a curved surface bulging toward the narrow base end (a ′) side (see FIGS. 1 and 2).

Also, the respective rising surfaces a ₅ ″ of each step (a ₅ ) (a ₇ ) ...
(A ₇ ″) ... may be sealed with resin or adhesive.

Further, the left and right ribs (a ₃ ) (a ₃ ) are respectively provided with steps different from the stepped portions (a ₅ ), so that the rigidity can be adjusted arbitrarily.

The above-mentioned fin (A) is merely an example and is not limited to the above-mentioned shape. For example, the notches (a ₄ ) (a ₆ ) ... The shape may be arbitrary.

Further, in the step of making the cuts, if the laminated original plate is transparent, an underlayment material (not shown) with necessary scoring lines for cutting is installed under the original plate, or the required ruled lines are previously formed on the lower surface of the original plate. If you mark the line, it will be convenient and convenient to perform the cutting operation.

(Effect of the Invention) According to the present invention, which has the structure as described above, and the boundary edge of each step portion is curved with a curved surface that bulges toward the narrow base end side, only the blade portion between the ribs on both sides kicks. At the same time, it is easily deformed, and on the other hand, the thick ribs on both sides prevent unbalanced (horizontal) flexure of the fin during use, so it is a fin made of hard reinforced plastic for swimming fins. However, it is possible to provide a fin for fin swimming that has less resistance when kicking while suppressing lateral bending.

Therefore, even if the balance at the time of kicking is poor, the water can be well caught and kicked out without being biased, so a reliable propulsive force can be obtained regardless of the level of the user, and it is very convenient to use.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the fin for swimming fins of the present invention, and FIG. 2 is a sectional view taken along line (II)-(II) of FIG. In FIG. (A): a fin (a): laminated master (a '): narrow base end (a _2): broad tip _{(a 3) (a 3)} : thick-walled rib (a ₄₎ (A ₆ ) ...: Notch (a ₅ ) (a ₇ ) ...: Step (a ₆ ′) (a ₁₀ ′)…: Border edge (1): Reinforcement material (2): Resin

Claims (1)

[Scope of utility model registration request] 1. A left and right side of a reinforced plastic laminated original plate cut out in a substantially fan shape with a wide tip after being coated by alternately applying resin to a plurality of reinforcing materials of the same shape made of fiber woven fabric, defoaming and laminating. In addition to leaving thick ribs of the same width and the same height, the original plate between the left and right ribs is successively thin-walled in a stepwise shape toward the wide tip side, and each step boundary edge is formed into a narrow base. A fin for swimming made of reinforced plastic, which is curved and has a curved surface that bulges toward the end.