BACKGROUND OF THE INVENTION
The Reverse Thrust Swimming Flipper is an aquatic device that increases the stroke efficiency while inverting the direction of the thrust produced by the stroke. It is secured to the foot of the swimmer and includes a semi-flexible and oscillating water-contacting surface resembling webbed feet in appearance but reverse in operation.
Regular flippers have been developed for exercise purposes but they have the disadvantage of requiring a large body of water. This, because of the increased speed the swimmer acquires when using them. Other products have tried to reduce the size or modify the shape of the flipper to diminish the speed; this also reduces the resistance in the leg strokes. This, in turn, reduces the amount of resistance the swimmer exerts with each stroke and thus reduces the effectiveness of the exercise.
BRIEF SUMMARY OF THE INVENTION
The main idea of the reverse thrust flipper is that through its reverse thrust the swimmer can effectively simulate the use of regular flippers for exercising and not have to have a large body of water. The exercise cessions can be done in smaller pools, rehabilitation tanks, lap pools, or other aquatic facilities.
With each leg stoke the swimmer (using reverse thrust flippers) produces a force opposite to the direction of regular swimming flippers. This force counters the forward-moving resultant force created by the legs and arm motion in customary swimming. The result of the opposite forces canceling is the need of less or no distance to be traveled to exert the same amount of work (exercise).
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus described the invention in general terms, reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
FIG. 1 shows a perspective view rendering of a reverse thrust swimming flipper that indicates the main parts of the flipper assembly according to one embodiment of the present invention.
FIG. 2 shows a plan view rendering of a reverse thrust swimming flipper that indicates the parts of the fin section of the flipper assembly according to one embodiment of the present invention.
FIG. 3 shows a side elevation rendering of a reverse thrust swimming flipper that indicates the parts and range of motion of the flipper assembly according to one embodiment of the present invention.
FIG. 4 shows an inverted side elevation rendering, depicting the flipper in use, of a reverse thrust swimming flipper that indicates the pressure acting on the fin and thrust and water flow produced by the flipper during an upwards leg stroke.
FIG. 5 shows an inverted side elevation rendering, depicting the flipper in use, of a reverse thrust swimming flipper that indicates the pressure acting on the fin and thrust and water flow produced by the flipper during a downwards leg stroke.
DETAILED DESCRIPTION OF THE INVENTION
The Reverse Thrust Swimming Flipper is a swimming flipper similar to those worn by scuba divers. The difference with these flippers is that instead of increasing the forward thrusts of the swimmer, they do the opposite by generating reverse thrusts with every movement of the user's legs. Similar to the way a jet airplane reverses the direction of the turbines after landing by redirecting the flow of air.
The Reverse Thrust Flipper is composed of two sections. See FIG. 1. The first is the Shoe section and the second is the Fin section. The Shoe section is similar to regular swimming flippers with full foot or open heel configuration. The Fin section, object of this patent, is divided into several components as shown in FIG. 2.
The part of the Fin that produces de reverse trust is the Oscillating Fin. See FIG. 2, and FIG. 3. It is attached to the end of the flipper, opposite of the shoe, through a hinged connection (Hinge). The Oscillating fin has free angular movement, up and down, with respect to the flipper. See FIG. 3. The Oscillating Fin is made of semi-rigid material to allow for some deflection caused by movement while in use. It is however rigid enough to transfer the pressure created by the leg strokes to generate a controlled water flow. The Oscillating Fin is connected on its lateral sides to a flexible non permeable Membrane that allows the Oscillating Fin to move freely but does not allow the water, trapped in the cavity that is formed, to exit though the sides of the Fin. See FIG. 4 and FIG. 5. The membranes also set the Oscillating Fin's maximum range of movement (the Upper Oscillating Fin Position and the Lower Oscillating fin Position), as shown on FIG. 3, and transfer the swimmer's force to displace the Oscillating Fin and generate the reverse thrust. The flipper has two Side Stability Ribs and one End Stability Rib, they are the structural components of the flipper. Their purpose is to hold together the moving parts and to transfer the force of the Fin to the Shoe without adding substantial contact area as to produce unwanted forward moving thrust.
The flipper produces reverse thrust during the upward and downward leg strokes, during swimming. This is because the Oscillating Fin changes position with each change in direction of the leg stroke. When the swimmer's leg pushes upward, water pressure on the top side of the Oscillating Fin causes it to resist upward movement. See FIG. 4. As the flipper moves upward it gets to a point where the Membranes (which are connected to both the Oscillating Fin and the Side Stability Ribs) tense and then begin to pull on the Oscillating fin. At this point further flipper upward movement creates a cavity of water that has only one exit towards the back of the flipper (towards the shoe). The flow of water creates a thrust that produces a force opposite to the swimmer's direction. When the swimmer's leg pushes downward, the same effect happens but with the Oscillating Fin changing to the Lower Oscillating fin Position. See FIG. 5.
Patent Application
20120289105
