JPH0663179A - Manufacture of fin for fin-swimming - Google Patents

Abstract

PURPOSE:To provide a manufacture of a fin for fin-swimming, which can form the outer surface of a fin in such a shape that it is thinner and thinner in a step-like manner toward a wider distal end of the fin. CONSTITUTION:A plurality of reinforcing materials 1 having an identical shape are applied with a resin 2 and defoamed, alternately and successively so as to form a lamination A having a desired thickness A'', from which a original plate A' having a sector-like shape in a plan view, is formed. Further, desired numbers of the resin films 2 and the reinforcing materials are peeled off from the outer surface a1 of the original plate A', and a lower resin film 2 which has been exposed by the above-mentioned peel-off, is peeled off by a width which is smaller than that of the previously peeled-off resin film 2 together with the reinforcing material 1. With the repetitions of the above-mentioned steps, a fin A which is stepwisely thinner and thinner toward its wider distal end is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing fins for fin swimming, which are successively formed in a thin step toward a wide tip.

[0002]

2. Description of the Related Art Fins for conventional fin swimming are
As described in Japanese Utility Model Laid-Open No. 61-26556, one glass fiber plate having a desired thickness is cut out into a flat fan shape having a wide tip to form an original plate.
The surface of the original plate was formed stepwise so as to have a desired thickness and a gradually decreasing thickness toward a wide tip.

[0003]

However, in the conventional fin described above, the surface of the original plate made of a single glass fiber plate having a desired thickness must be shaved so as to become a thin stepped shape toward the wide tip. It is very difficult to shave because it has to be done, and it is not only time-consuming to form and adjust the steps well, but also to form and adjust according to the user's request.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a fin that can easily and surely form a thin stepped surface toward a wide tip. It is to provide a method for manufacturing a swimming fin.

[0005]

In order to achieve the above 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 forming a laminated body of a desired thickness, and then curing the laminated body, it is cut out into a plane shape substantially fan-shaped with a wide tip to form a laminated original plate made of reinforced plastic, and then both front and back surfaces of the original plate, or the surface. Or, peel off the uppermost resin surface and the reinforcing material in an arbitrary range from the wide tip side of one of the back surfaces to the rear side, and place the lower resin surface that appears after the cutting off under the resin surface. Along with the reinforcing material to be cut off, peel off in an arbitrary range from the tip side toward the rear in a narrower shape than the previous peeling range, and sequentially peel off the resin surface and the reinforcing material located under the resin surface. , Tear off the tip By peeling-away repeatedly narrower shape than circumference, is to form a stepped portion sequential thin shape toward the wide tip.

[0006]

EXAMPLE An example of the production method of the present invention will be described below. The outline is as follows: laminate forming step → master plate forming step → surface thin step forming step.

[Process for forming laminated body] First, a reinforcing material 1 cut into the same shape (size), for example, a required number of glass fiber woven cloths cut into about 1 m square are prepared, and the reinforcing material 1 Apply the resin surface 2 such as saturated polyester with a roller etc. to permeate it and expel air bubbles (defoaming)
The work is repeated a plurality of times to stack the required number of reinforcing members 1 having the same shape, and finally a mylar sheet (not shown).
Etc. are adhered and allowed to cure at room temperature or under heating for a required time to form a flat laminate A ″ having a required thickness with the upper and lower surfaces being resin surfaces 2 and 2.

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 (in the case of the drawing system example, depending on the leg force difference of each user). 5 sheets, usually a stacking range of 2 to 20 sheets) can be increased or decreased.

On the other hand, for the resin surface 2, it is assumed that a thermosetting resin for low-pressure lamination such as unsaturated polyester resin, epoxy resin, low-pressure phenol resin, etc. is used. It is also possible to add a curing agent, an accelerator, a pigment, etc., if necessary.

[Step of forming original plate] Then, the flat laminated body thus formed is provided with a protruding portion a'to be a fixing surface of a foot inserting portion (not shown) on the rear side by using, for example, a cut grinder or the like. By cutting out into a substantially fan shape with a wide tip and deburring the peripheral edge, a flat, substantially fan-shaped reinforced plastic laminated original plate A ′ is formed.

[Step of forming a thin step on the surface] Then, for example, on the surface a ₁ of the original plate, from the one corner a ₃ of the wide tip a _{2 to} the other corner a _{3 of the} rear projection a ' The cut a ₄ is made from the uppermost resin surface 2 at the required depth (for example, 1 to 3 of each of the laminated reinforcing material 1 and the resin surface 2 ...) With a partition that faces toward the vicinity, and the cut a _When the required number of the reinforcing material 1 and the resin surface 2 within the depth range of the notch a ₄ are cut off along the entire width of the wide tip portion a ₂ along the step ₄ , the step portion a ₅ that is one step lower than the surface a ₁ is cut off. The resin surface 2 that constitutes

[0012] Subsequently, the add a ₆ cut with a narrower section than the step portion a ₅ on the stepped portion a ₅ while leaving the posterior portion a ₅ step portions a ₅ 'in the required range, cuts that a ₆ cut across the distal end portion a ₂ whole along a ₆
When the required number of the reinforcing material 1 and the resin surface 2 are cut off within the depth range of 1, the resin 2 forming the step a ₇ that is one step lower than the step a ₅ appears.

Then, when the above process is repeated while making successive cuts to make the section narrower than the latest step, the fin A having a stepwise thin shape is formed toward the wide tip a ₂ .

Further, each rising surface a ₅ ″, a ₇ ″ of each of the step portions a ₅ , a ₇ , a ₉ ... _{May be} sealed with a resin or an adhesive, etc. Edge cover made of rubber or the like (not shown) on both sides a ₁ ′, a ₁ ′ according to
May be attached.

In the above process, the case where only the front surface of the laminated original plate made of reinforced plastic is formed stepwise is shown. However, only the back surface may be formed, or both the front and back sides may be formed stepwise, and it is possible to respond appropriately. Is.

The shape of the fin A is merely an example and is not limited to the above-described shape. For example, the fin A has a substantially inverted V shape in a plane symmetrical with the central partition wall as a boundary between both sides of the surface a _1. it may obtained by a sequential thin shape toward the wide tip a _2, or cuts a _4, a ₆ ... may be used as the arbitrary shape in accordance with the user's preference such as wavy. In this case, it is assumed that providing the stepped portion a _5, a ₇ ... different steps in the central baffle may be aims rigidity adjustment.

Further, in the step of making the cuts, if the laminated original plate is transparent, an underlayment material (not shown) provided with a required score line for cutting is placed under the original plate or on the lower surface of the original plate in advance. If you mark the required marking lines, the cutting operation will be easy and reliable and convenient.

[0018]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, when the surface of the laminated original plate made of reinforced plastic is formed into a thin stepped shape toward the wide tip, a resin surface, a reinforcing material, a resin It is possible to form stepped steps with required steps by easily and surely peeling off the resin surface and the reinforcing material by the required number of sheets from the surface laminated in order.

Therefore, as compared with the conventional manufacturing method in which the surface of the original plate made of a single glass fiber plate having a desired thickness has to be cut into a thin-walled step toward the wide tip, The step is well formed and can be easily formed as requested by the user, and the work efficiency is good.

A method of stacking layers of reinforcing materials of different sizes may be considered. However, since the reinforcing material is likely to move and the terminals are easily disturbed during stacking, the stepped portion of the finished product is manufactured by this method. However, there is a high possibility that the fibers at the tips (ends) of the respective stepped portions are easily frayed and the appearance value is lowered by this method. However, according to the manufacturing method of the present invention, the same shape is obtained. Since the reinforcing materials are laminated to form the original plate and then formed in steps, the ends of each reinforcing material are deleted when forming the steps, and the appearance of the product due to terminal distortion, fraying, etc. There is no fear of reducing the value.

[Brief description of drawings]

FIG. 1 is an overall view showing steps of a manufacturing method of the present invention.

FIG. 2 is a vertical cross-sectional side view showing an example of fins for fin swimming formed by the manufacturing method of the present invention.

[Explanation of symbols]

A: Fin A ': reinforced plastic laminated master A ": laminate a _1: surface a _2: wide tip a _5, a ₇ ...: step portion 1: stiffener 2: resin surface

Claims (1)

[Claims] 1. A plurality of reinforcing members of the same shape made of fiber woven cloth are alternately coated with a resin in sequence and defoamed to form a laminate having a desired thickness, and then the laminate is cured and then the tip is formed. A wide planar shape is cut out into a fan shape to form a laminated original plate made of reinforced plastic, and then both sides of the original plate, or either the front side or the back side, either the wide top side in any range facing rearward from the wide tip side Peel off the resin surface and the reinforcing material of, and the lower resin surface that appears after the peeling, together with the reinforcing material located under the resin surface, narrower than the previous peeling range from the tip side to the rear side. Peel off in an arbitrary range toward each other, and then repeatedly peel off the resin surface that appears after sequentially peeling off and the reinforcing material located under the resin surface in a narrower width than the previous peeling range, thereby wide tip Toward Method of manufacturing a fin swimming fin, which comprises forming a step portion to thin-walled.