FI93426B - frisbee - Google Patents

Description

* 93426

frisbee

The invention relates to a throwing object for use as a toy, leisure and sports device 5, which returns to its thrower.

One previously known device, somewhat reminiscent of the invention, is the so-called yo-yo, a relatively heavy object that returns to the user on its free-winding cord. In a string, the string tied to the finger is about a meter long, and when released from the string, it winds straight from the reel formed by the string. In this case, the potential energy produced by the gravity of the ground is converted into kinetic energy, which is divided into the energy of the rotational movement around the axis of the coil and, to some extent, the kinetic energy in the direction of the discharged rope. The mainly converted energy binds to the rotational motion, and when the rope is fully discharged, the yo-yo continues to rotate, rewinding back to its wearer as the energy of the rotational motion works against the ground traction-20 ground. Jojo does not fly and its essential directions of movement are parallel to the direction of gravity of the earth.

Another prior art device somewhat reminiscent of the invention is a disc-shaped connecting disc, e.g., U.S. Patent 3,359,678, Headrick 25, etc. It is an object symmetrical about its vertical axis, flying around its axis of symmetry, which stabilizes the flight, and forward, the disc forming a carrier plane. Since it does not return to its thrower, it is usually required to have at least two people flying a reel between them to make use of this connecting reel 30 meaningful. Using such an object alone is frustrating, with the thrower being forced to move behind the puck after each throw.

A previously known device for solving the problem is disclosed in U.S. Pat. No. 3,802,117 to Engelhardt. The device in question comprises in its basic form a connecting disc and a spool below it at the end of the shaft, to which a rope is connected, the end of which on the thrower side is connected to the end of the stick. Although such a device can be used alone, it is quite difficult. Because the reel is located below the connecting echo and is relatively far from the disc, the object dives very easily as the rope tightens during flight. This patent solution offers the suspension of an additional weight at the lower end of the spool 5 - however, this additional weight shortens the effective length of the string.

The problems of the former have been solved in WO 92/11913, Tomberlin. The flying toy in question comprises two 10 identical rotating elements with wings and a hub between which the string rotates. Due to this structure, the toy loses the fascinating flight characteristics of the connecting disc: the wings that provide the lift brake it and slow it down strongly. The toy lacks the smoothness of the flying disc.

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A further disadvantage of all known solutions using some kind of string system is that they have not been able to solve the full range of aerodynamic properties, but all have coils and the like, which stick badly out of the structure and cause high air resistance and especially turbulence in the air flow.

The structure according to the invention avoids the above and other limitations of the field and achieves an aerodynamically fusible-25 linear and clear shape. The invention is characterized by what is stated in the appended claims.

A retractable discarded object - unlike a yo-yo - connects with air support. Further, in contrast to the jojoba, which largely 30 converts the potential difference in the Earth's Gravitational Field into kinetic energy, the retractable discarded object derives its kinetic energy almost exclusively from the forward throw. The energy of the throw is sufficiently converted into rotational energy, which returns the object to its thrower. It is possible for the object according to the invention to be melt-linear and aerodynamic in appearance; its structures are clear, aesthetic and simple. In this respect, the invention makes a decisive improvement to the Engelhardt device. The positioning of the towing point with respect to the center of gravity 3 93426 is also considerably better than in the Engelhardt device.

These improvements substantially affect the flight characteristics of the device according to the invention.

5 A further advantage of the invention is the ability to attractively incorporate two old familiar, perhaps even beloved, ideas - a jockey board - causing the user to first create an idea of how the invention would work in practice and then to experiment. The glide of a back-throwing discarded object is visually fascinating, 10 and practicing it is challenging and evolving.

In the following, the invention will be explained with reference to the accompanying drawings, in which Figure 1 shows a side view of an object according to the invention without a string.

Figure 2 shows a top view of an object according to the invention, and partly split.

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Figure 3 shows a top view of the axis of a discarded article according to the invention.

Figure 4 shows a top view of the second axis of the object to be thrown according to the invention.

Figure 5 is a side view and section of the part of Figure 4.

Figure 6 shows a part of a further embodiment of a discardable article according to the invention, seen from the side and split.

Figure 7 is a side view and split view of a flange of an embodiment of a discardable article according to the invention.

Fig. 8 shows a side view and an embodiment of a flange of a discarded article according to the invention.

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Fig. 9 shows a side view of a flange similar to Fig. 8 in its second embodiment and split.

Figure 10 shows a top view of air currents when throwing an object 5 according to the invention.

Fig. 11 shows a situation similar to Fig. 10 in another embodiment, also seen from above.

Figure 12 is a side view of the situation of Figure 10.

Fig. 13 shows a side view of the situation of Fig. 11.

Figure 14 shows a side view and a partial split of a solution for preventing the twisting of a string belonging to a discardable object 15 according to the invention.

The retractable disposable article according to the invention comprises, according to Figures 1 and 2, a body part 1 which, like the whole article, is made of a suitable plastic (s), for example polyethylene or polypropylene. Other materials may also be considered. The body part 1, its axis 2 parallel to the axis of symmetry and the flange 3 form a spool for the string 4. By string is meant here a string, yarn, ribbon, line, cloth or the like made of flexible material. The body part 1 is loosely concave so that the edges 12 of the circular plate part 11 bend downwards, leaving a cavity below the plate part. The plate portion is either straight or slightly conical in either direction. The flange 3 is on the convex side of the disc-like body 1, which allows the cord 4 to be wound smoothly and unobstructed.

The embodiment of the retractable object to be thrown according to Fig. 2 is thrown from the hand like a connecting disc, giving it 35 a slight rotational movement in the case of Fig. 2 clockwise while being thrown forward relatively strongly. The rope 4 is attached to the throwing hand, for example by a loop around the wrist.

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As it flies upward on paper as shown in Figure 2, the energy of the throw further accelerates the object clockwise. By using a relatively thick string, the length of the string per revolution is changed as the object flies, so that when the object is thrown, the rotational speed of the object accelerates. This is essential because in this way the thickness of the rope and the torque of the object are matched to the rotation of the flywheel formed by the object for uniform use in the rotational movement of the flywheel formed by the object during the return flight.

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Once the entire string has been wound from the spool formed by the structure, the speed of advance has dropped and without any noticeable jerk, the object now changes its direction of flight downwards with the paper in mind and rewinds back to the thrower by its rotational energy. The rotational speed of the object at the turning point of the flight direction is high and the speed of propagation is low, since a large part of the kinetic energy is now bound to the rotational movement of the object, which is characteristic of the invention. Thus, the loss of energy when the direction of travel changes is also small.

In order to achieve such an effect, it is essential according to the invention to choose a string 4 of sufficient thickness, to use a shorter length of the shaft 2 and to construct the distance between the flange 3 and the body part 1 sufficiently short, for example 1-2 string thicknesses. In this case, the rope 4 25 according to Fig. 2 rotates on the shaft 2 in a spiral manner, realizing the purpose of the invention. When the direction changes, the need arises to construct the object so that the plane at which the center of mass is located is above the plane of the string 4 or at least as close as possible to the plane of the string 4. This is because, especially when the object changes direction 30, and taking into account the variation of throwing speeds within certain limits, the inertia tending to change the position of the object in the air, the string 4 as its fulcrum, favorably influences the object position and thus optimizes return flight characteristics. By shifting the center of gravity substantially to the side of the flange 2 or otherwise suitably utilizing the oscillation of the center of mass as the direction changes, a return flight at a large angle of flight can be achieved, allowing the object to return slowly and safely against the air column.

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In principle, a weight can even be built above the flange or below the body to achieve these goals. The flight of the object takes place by connecting it with the support of air, because it as a whole forms a wing profile, the position of which is stabilized by rotation. Flange 3 is an integral part of the aerodynamic whole. The rope 4 is fixed rigidly to the shaft 2, for example by tying it around the shaft 2 or in another way.

When the retractable object to be thrown, as in the previous example, has returned to the thrower's hand, it is ready for a new throw. This time, the object is thrown forward while giving it a slight counterclockwise rotation. When throwing an object, an grip can be taken with the thumb on the outside of the body part 1 and the other fingers on the inside.

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Figure 3 shows one embodiment of the shaft 2, in which the symmetry of the shaft is broken by grooving the bus at the center of the shaft on the string 4. The walls of the fairway are formed into arches, one of which, immediately after the turning point of the flight, slidably increases the torque of 20, thus making the start of the return flight smoother. In the figure, the string 4 is attached to the shaft 2 by a node 41 which supports the walls of the bus. The shaft may otherwise be round or round.

The walls of the bus can be formed into circular arcs, although other curve shapes may also be considered. It is essential in this embodiment that a sufficient amount of the outer edge of the shaft is left not grooved. In this case, a few turns of the string 4 equalizes the symmetry of the ball.

Fig. 4 is a variation of the shaft of the type of Fig. 3, in which the actual shaft 21 is surrounded by a bracket 23 rotating freely around the shaft 21 and the low block threshold 22, through which the string 4 passes and is connected to the shaft structure 2 by a knot 41.

35 In Figure 5, the same or a similar type of shaft structure is illustrated from the side. The numbering follows the previous one. The threshold 22 is low enough to allow the cord 4 to move laterally without hindrance, but still high enough to support the zinc as it rotates. The threshold 22 can in principle be formed in either the flange 3 or the body part 1 or both. With this structure, it is possible to increase the torque even more evenly than in the structure of Fig. 3 at the point of inflection of the flight and still maintain substantially the roundness of the shaft 2 5 soon after the point of inflection.

Fig. 6 shows an embodiment in which the shaft 21 forms a spool of string 4 for a thin extension 42 so that the string 4 itself remains aligned with the shaft 21 in the body part 1 and in the flange 3 on the ridge 25 formed by the ridges 25. In this embodiment, the string 4 can be narrower in diameter and thus lighter, allowing larger string lengths. It should be noted that the same objects can also be achieved as shown in Figures 4 and 5 above.

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Fig. 7 shows an embodiment of the flange 3 such that the upper surface forms an aerodynamic arc and at low flight angles the air flow generally exceeds the cavity 31 in the middle part of the flange 3. The edges 33 of the cavity 31 rise suitably to then curve downwards as edge portions 34 again. This type of flange can be built light and at the same time aerodynamic. It can be injection molded in one piece and provide a durable housing structure. The structure can also be covered if desired.

Figures 8 and 9 show two embodiments of a technical solution which improves the winding properties of a retractable discarded article when discarded at lower corners. In this case, especially during the final stage of rewinding, the object climbs and the levels of the flange 31 of the flange 4 are at an angle to each other as shown in Fig. 8, and the rotation of the flange 3 tends to rotate the flange 4 to the thread. In Fig. 8, a rim-like rotating part 32 mounted on the edge of the flange 31 solves the problem. In Fig. 9, the rotating part 32 is mounted on the shaft 2, placed on the upper side 35 of the flange 3.1 and extends beyond it.

Figure 10 shows a clockwise throwing object flying to the right on paper, which rotates clockwise. In this 8 93426 embodiment, the body part 1 and the flange 2 are homogeneous in surface structure with respect to the imaginary circular axes of the axis of rotation. The flow lines illustrate airflows as laminar and turbulent, which properties are to be compared with the three figures below.

Figure 11 shows an embodiment of the device according to the invention, which substantially improves the aerodynamic properties. On the downwardly curving surface 12 of the body part 1, 10 spherical segment-shaped recesses are formed, which cause turbulence and increase the friction between the body part 1 and the air flow. Provided that the shapes and placement of the recesses are chosen correctly, the air flow continues laminar further away from the direction of travel of the body part 1 and thus the total resistance of the object and at the same time the Reynolds number decreases, which is desirable.

A comparison of Figures 10 and 11 shows how successful design, size, number, and placement of recesses reduces turbulence at the rear of the device.

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Fig. 12 shows, as in Fig. 10, a structural solution which is homogeneous in surface structure with respect to the direction of rotational movement, while Fig. 13 shows an embodiment of the type of Fig. 11. Decreasing the Reynolds number reduces the air resistance of the object while the relatively rapidly rotating outer circumference of the object provides lift as the object flies. Most of the buoyancy is located on the non-stringed side of the object, both when the string is unloaded and when the object is wound on the thrower. In this way, the lifting feature of the rope can be compensated, which substantially improves the stability of the flight.

The decrease in air resistance and the location of the buoyancy on the upper surface of the object reduce the angle of flight α of the object, as can be seen by comparing Figures 12 and 13. This reduces friction when the rope 4 is unwound from the reel and, if constructed, also during the return flight. When the substantially angle α is small or negative when the object reaches the breaking point of the flight determined by the string 4, the object is made to return directly to its thrower. The buoyancy keeps the object in a substantially straight flight path as it enters when the object is thrown straight.

9 93426 These advantages, explained by means of the previous Figures 10-13, can be achieved by using various recesses defined by the segments of curved lines and by placing the recesses at suitable intervals, of suitable size, in the body part 1 and / or 5 on the flange 3. In addition to the recesses can be used alone or in combination protrusions or ridges in many shapes and variations, however, so as to cause turbulence as the object rotates. It should be noted that if turbulence is caused by too much air resistance increases. Depending on the intended use of the embodiment of the object according to the invention, the properties can also be optimized for different speeds.

Fig. 14 shows an example of a joint 5 with a pin 51 rigidly attached to a sleeve 52 which is also rigidly attached 15 to the first part of the string 4. The other end of the pin is thickened to take advantage of this feature, it is placed on the sleeve 53 in a way which allows the sleeve 53 to rotate freely relative to the pin 51, however, so that this assembly withstands tension and the rotational friction is still sufficiently low. The sleeve 53 is rigidly attached 20 to the second part of the string 4. Such a joint allows the cord to rotate freely without the cord going into a thread. This joint 5 can be applied in various embodiments to improve the rewindability characteristics of the retractable object and to facilitate manual twisting of the string 4 when the object is brought into the throw standby state 25, whereby the string 4 would otherwise be prone to threading.

The invention is not limited to the embodiments shown in the description and in the drawings, but may be modified within the scope of the appended claims.

Claims (8)

10 93426 A castable and returnable connecting disc comprising a disc-shaped substantially convex body portion (1) providing substantially connecting properties, a substantially axial and spaced flange portion (3) on its convex side, and a string (4) or the like attached to the shaft (2) between the body part and the flange, characterized in that the flange part (3) is known per se to be substantially away from the thickness of the string 10 (4) from the body part (1) and that the flange part (3) ) is at least about half the diameter of the connecting disc. Connecting disc according to Claim 1, characterized in that the diameter of the flange (3) is at least about 60% of the diameter of the connecting disc. Connecting disc according to Claim 1, characterized in that at least part of the outer surface of the connecting disc is provided with surface formations which act as air guides 20 as the connecting disc moves and / or rotates. Connecting disc according to Claim 1, characterized in that the flange (3) is also convex in basic shape in the direction of the body part (1), so that there is, however, a substantially flat-based recess (31) in its center. Connecting disc according to one of the preceding claims, characterized by a freely rotating flange edge protection, either around the edge of the flange or on the shaft (2), only by a part (32) which rotates when the cord (4) is wound in or out. Connecting disc according to Claim 1, characterized in that the cord (4) is fastened to the bottom of the notched rounded edge in the shaft (2) and that the shaft (2) is provided with a sleeve or ring (23) which rotates freely around it. ) pierces. Il 93426 Connecting disc according to Claim 6, characterized in that the shaft (2) has at least one threshold-like projection (22) at the notch to support the ring (23). Connecting disc according to one of the preceding claims, characterized by ridges (25) facing the body part (1) and the flange (3) which retain the cord (4) from the outside but allow a thinner extension (42) of the cord (4) to pass between the shaft (2) for rotation. 10 12 93426