JPS616097A - Propelling caudal fin - Google Patents

Abstract

PURPOSE:To increase propelling efficiency by stretching a soft film on a fin frame forming the contour of a caudal fin to constitute the propelling caudal fin. CONSTITUTION:A fin frame 1 is made by molding the front 3 of a caudal fin and the contour of both sides 3, and a soft film 4 is stretched on this fin frame 1. The fin frame 1 is fitted to a swaying body 5, and the propelling force is obtained by swaying the fin frame 1 via the swaying body 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a propulsion tail fin for nimblely propelling floating objects such as small boats, horizontal fish, and swimming equipment by means of the tail fin that swings in the water.

[Conventional technology]

1b There was one in which the tip of the rocking body was formed into a plate-like fin, and the water was propelled by the fin.

There was one that had a plate-shaped fin attached to the end of the rocker with the required amount of play to act as a shield and propel it while rotating.

At the end of the oscillating body, there was an elastic plate-like fin that propelled it through water.

[Problem that the invention seeks to solve]

Integrated molded fins and elastic fins face,
One-half to one-sixth of the oscillating stroke, which is limited by the large resistance due to oscillating in the water, is used for propulsion due to the rotation of the fins and the rotation of the fins. There was an impairment loss on the capping used.

The surface of the fin was an isomorphic object type, so efficiency was faithful.

When moving the pivoted fins up and down, the rear part of the fins floated up and down for play, and the rotation was difficult.

A large amount of force was concentrated on the central part and nutsopar, which caused the malfunction.

As the fins grow larger, the strength required doubles, making them purebred.

For the above reasons, the promotion effect was not good.

[Means to solve the opening movement]

The conventional plate-shaped fin has been completely abolished, and a flexible fin is attached to a fin frame formed by shaping the front and both sides of the required tail fin.

[Effect]

The membrane, which is fixed on three sides, has the property of resisting water resistance through rocking, and gradually forms larger arc-shaped internal cavities from the tip of the fin toward the tail, which is not fixed.

Because this internal cavity captures water, the efficiency of plate-shaped fins with the same projected area is improved.

The inner cavity of the fin is made of a similar surface to the direction of movement of the fin, so it can be propelled by the intrusion action.

The surface of this inner cavity can have a sloping angle or a trumpet-like expansion depending on the tension of the membrane being spread and the position and shape of the gore attached to the membrane.

This lumen quickly reverses at the dead center of rocking, creating a lumen that accommodates retrograde movement. That is, when the movement of the fin frame stops at the dead center, the flexible membrane that was filled with water and under tension is released from its restraint and becomes floating.

The swollen flexible membrane, which had been pushed by me and given the speed and direction of the rocking, was pushed to the opposite side of the fin frame by the reach of the rocking, forming an inverted lumen. I'll make it. Therefore, the entire stroke of one swing can be used for propulsion.

By using the above two cages of action points, it was possible to improve the propulsion effect even more than the conventional one.

〔Example〕

The present invention will be explained in more detail with reference to all the drawings.

FIG. 1 is a plan view showing an entire example of the first wrapping method of the present invention.

The fin frame l is formed by molding the outer contour of the required tail fin with the front 2 and both sides 3°3, and is attached to and integrated with the swinging body 5 so that it can swing in the plane direction. Or, it is linked to Pinuton.

A flexible membrane 4 is spread on this fin frame to form a propulsion tail fin.

FIG. 2 is a P view showing an example of the second embodiment of the present invention.

The fin frame 1 of the first embodiment is replaced with an elastic fin frame 1', and when the phantom body is at rest, the flexible membrane 4 is in a stretched state, but by interlocking, the arc-shaped inner cavity is expanded. At the same time, it completely narrows the opening of 3.4v on both sides of the fin frame, makes it easier to form the inner cavity, and extends the flexible #I4 at the dead center of movement. Compared to the first projecting example, the flexible case 4 can easily form the required inner cavity, has a tight grip on water, and further improves the propellant (+3) due to the difference in the ItjH-A surface.

Furthermore, the slope of the inner cavity surface changes depending on the strength of the rocking.

FIG. 6 is a Japanese view showing an example of the M3 embodiment of the present invention.

The fin frame 1' is elastic and has both sides 3 of its opening,
The wire 6 that clamps the wire 3 and the tightening screw 7 can be inserted.

The point of action that is different from the second embodiment is the dead center of the swing, and the slack flexible membrane 4 is released from tension and becomes a floating state, and the force of the following water moves it to the opposite side of the fin frame 1'. Since the VC is pushed away and the plane of the lumen is reversed, the entire swinging stroke can be subjected to the propulsion river.

FIG. 4 is a perspective view showing an example of the fourth embodiment of the present invention.

A flexible membrane 4 is stretched on the fin frame 1, tensioned in the direction of the side edges 3 and 3 at the fin tip 2, and gradually loosened toward the rear. Regardless of the strength of the rocking, the slope of the planned inner cavity is the same propellant as the 9th and 6th Meishijin) 43
do.

FIG. 5, FIG. 6, and FIG. 7 are plan views showing several examples of the fifth embodiment of the present invention.

By inserting a gore 8 of a desired shape into the spread flexible membrane 4 of the first, second, sixth, and fourth embodiments, the rear surface of the fin can be expanded accordingly.

The inner cavity has an outward-opening shape to provide the best propulsion effect.

[Efficacy of invention]

The surface of the fin, which is made up of membranes fixed on all three sides, forms an arc-shaped internal cavity that traps water, making it more efficient than a flat fin.

Since the surface of the inner cavity is a thin membrane that moves in the direction of rocking, it has an excellent directional approach action.

The resistance force applied to the fin surface is distributed to the fin frame and There is no failure like with the pivot stopper.

There are a total of 11 surfaces in the lumen! ! It is possible to change it somewhat.

Ume-zukuri is very simple, and it is easy and convenient to attach the propelled object.

[Brief explanation of drawings]

Figure 1 is a plan showing the first implementation. Figure 2 is a sushi celebration diagram showing the second Meishi district. Figure 6 is a perspective view showing the sixth Meishi. Figure 4 is the fourth implementation. Figures 5, 6, and 7 are plan views showing the fifth aspect of the sushi.

Claims (1)

[Scope of Claims] 1. A propulsion tail fin, characterized in that a flexible membrane is spread on a fin frame formed by shaping the front and both sides of the required tail fin. 2. The propulsion tail fin according to claim 1, wherein the fin frame is elastic. 3. The propulsion fin according to claim 1, wherein the fin frame is elastic and has fasteners that clamp both sides of the opening. 4. The propulsion tail fin according to claim 1, wherein the flexible membrane is tensioned in the lateral direction at the tip of the fin and gradually loosened and expanded as it goes rearward. 5. The propulsion tail fin according to claim 1, wherein the flexible membrane is cut and gusseted.