Aerodynamic toy

An aerodynamic toy is provided with a circular central portion having a center surrounded by a substantially flat circular surface, a rim circumscribing the circular central portion terminating in a given plane, a surface of curvature extending from the flat circular surface and curving downwardly to the rim to form an outer convex surface and an inner concave surface and a lip concentric with the rim and extending from the inner concave surface and terminating before the given plane.

BACKGROUND OF THE INVENTION 
The present invention relates to an aerodynamic toy of the type which is 
thrown by the user. 
A large number of aerodynamic toys of this type are well known and can be 
readily seen at recreational sites, such as beaches, parks or school 
playgrounds. A variety of these devices are disclosed in U.S. Pat. Nos. 
2,659,178, 2,835,073, 3,580,580 and 3,590,518. 
Toys of this type are usually made of molded plastic discs which are thrown 
or launched for flight by gripping the disc with the thumb on the convex 
outer side thereof and with one or more fingers on the concave inner 
surface of the unit. It is thrown by using an underhand or sidearm motion 
with a snapping action of the wrist. This causes the disc to spin and the 
direction of flight is determined by the angle at which the disc is 
released with respect to the horizontal plane. 
U.S. Pat. No. 3,828,466 discloses an aerodynamic device of this type which 
consists of a plurality of inter boundary rings projecting down from 
relatively flat plateau upper outer surfaces and which has raised dimples 
which make for a more comfortable hand grip and better control of the 
device when thrown. 
U.S. Pat. No. 3,855,728 teaches an aerodynamic toy which includes one disc 
nested within another disc and which are thrown at the same time and which 
separate during flight so that both land in the same vicinity. 
Typical flying disc type devices such as those disclosed in U.S. Pat. Nos. 
356,929, 3,359,678 3,724,122 and D 183,626 are designed with a number of 
circular raised ribs spaced apart on the convex side of the device. These 
ribs are placed on the device to create turbulence on the convex side 
which will decrease pressure on that side and create a lifting action. 
These devices are typically thin in the center section and thicker on the 
outside rim. Examples of this type are shown in U.S. Pat. Nos. 3,359,678 
and 4,045,029. The disadvantage of these rings on the outer surface of the 
device is that it causes an increase in drag and creates an annoying 
whistling sound in flight. 
SUMMARY OF THE INVENTION 
The present invention improves the known aerodynamic toys to improve the 
handling and the performance thereof. 
The invention provides a smooth outer convex surface which has no 
discontinuities therein to enable the toy to fly upside down when thrown 
at the proper angle and with sufficient spin and to enable the toy to fly 
silently. 
Further, the present invention provides an inner concentric lip which makes 
it possible to skip the toy on a hard surface and which concentrates 
weight distribution at the outer circumference. This allows for an 
increase in the number of revolutions in flight with the same exertion of 
force from the snapping wrist action and thus allows the toy to hover in 
flight longer and fly further. 
The inner concentric lip also increases the gripping surface to allow a 
beginner to control the toy more easily and makes possible various 
delaying tricks and maneuvers by the insertion of a finger nail or stick 
within the slot between the outer ring and the inner lip while the toy is 
revolving. 
The toy of the invention can be kicked and tapped by a catcher in a series 
of flowing movements as a result of the smooth, flat surface on the top 
and bottom thereof. The overall smooth surface of the toy allows it to fly 
further with less expenditure of energy due to a decrease in drag. 
The present invention provides an aerodynamic toy comprising an integral 
body having a circular central portion having a center surrounded by a 
substantially flat circular surface, a rim circumscribing the circular 
central portion and terminating in a given plane, a surface of curvature 
extending from the flat circular surface and curving downwardly to the rim 
to form an outer convex surface and an inner concave surface and a lip 
concentric with the rim and extending from the inner concave surface and 
terminating before the given plane. 
In a preferred embodiment, the rim has an outer convex surface and the flat 
circular surface, the surface of curvature and the outer convex surface of 
the rim are smooth and have no discontinuities in the connections thereof. 
In other embodiments, the lip is spaced from the rim a distance effective 
to prevent the insertion of an adult finger therebetween, and the lip may 
be either cylindrical in configuration or have an arcuate cross-section 
with a concave inner surface and a convex outer surface for improved 
gripping by the user. 
In a still further embodiment, the integral body is made of a plastic foam 
and the lip is spaced from the rim a distance sufficient to permit the 
insertion of an adult finger therebetween. 
The present invention will become apparent to those skilled in the art and 
will be better understood by reference to the following figures and the 
following description.

DETAILED DESCRIPTION OF THE INVENTION 
Referring now to FIGS. 1-3, the aerodynamic toy comprises a disc-shaped 
integral body 20 having a circular central portion 21 having a center 
surrounded by a substantially flat circular outer surface 21'. 
The disc-shaped body 20 also includes a rim 23 circumscribing the circular 
central portion 21 and terminating in a given plane P. The rim 23 has a 
convex outer surface 23' which has its greatest diameter at a point 
towards the center thereof to enable the toy to roll at the center of the 
rim as opposed to the unconnected end thereof. 
An intermediate portion 22 connects the circular central portion 21 with 
the rim 23 and has an outer convex surface 22' and an inner concave 
surface 25. The outer convex surface 22' curves downwardly to the rim as 
shown in FIGS. 2 and 3. 
As shown in FIGS. 1, 2 and 3, surfaces 21', 22' and 23' are connected to 
each other with no discontinuities and the curved surfaces 22' and 23' 
form an overall continuous curved surface with no discontinuities. 
Additionally, it is desirable to have surfaces 21', 22' and 23' to be as 
smooth as possible and devoid of any surface discontinuities aside from 
the possible appearance of a line or mark caused during the molding of the 
integral body. 
In order to improve the manipulative gripping and handling of the 
aerodynamic toy and for containing and retaining buoyant air, lip 24 is 
provided which is concentric with the rim 23 and extends from the inner 
concave surface 25 and terminates before the given plane P in a plane P'. 
The lip 24, as shown in FIG. 3, is cylindrical in configuration. The lip 24 
terminates at plane P' which is short of the plane P of the rim 23 for 
comfort and gives the thrower of the toy a far more positive degree of 
control than previous throwing type toys due to the fact that the thrower 
is given an inner gripping surface which is a short distance from the rim 
23. When one throws the toy, he can hold it at various angles as it is 
released, when determines the direction of flight of the toy. 
In a preferred embodiment of the present invention, as shown in FIG. 3, the 
lip 24 and rim 23 are spaced apart an effective distance to prevent the 
insertion of an adult finger therebetween. This spacing should be 
approximately 1/8" to 3/8" to enable one to insert one's fingernail or a 
smooth stick between the rim 23 and lip 24 for so-called delaying tricks 
and maneuvers. 
Referring now to FIG. 4, an alternative embodiment is shown which utilizes 
a curved lip 24' which has an arcuate cross-section with an inner concave 
surface and an outer convex surface. Lip 24' is spaced from rim 23 as in 
the case of the embodiment of FIG. 3 for a distance effective to prevent 
the insertion of an adult finger therebetween. 
The curved cross-section of lip 24' provides for an even more positive 
gripping by the thrower. The lips 24 and 24' allow the thrower a greater 
control over the angle at which the aerodynamic toy is released which of 
course determines the flight path of the toy. Additionally, as a result of 
the close proximity of lips 24 and 24' to rim 23, they confine and retain 
buyoant air and thus increasing the hovering capacity of the toy. 
The integral body 20 is preferably made of a plastic such as a high-density 
polyethylene or polypropylene plastic. In FIG. 5, another embodiment of 
the invention is shown wherein the integral body 20 comprises a plastic 
foam such as foamed polyethylene, polypropylen or polystyrene which will 
enable the aerodynamic toy to more readily float during use. Additionally, 
lip 30 is provided which also depends from inner concave surface 25 of 
intermediate portion 22 of the body, but which is spaced apart from the 
rim 23 by a distance sufficient to enable the insertion of an adult finger 
therebetween and which is preferably about 1/2 to 1". 
While preferred embodiments of the invention ave been described with 
respect to the drawings, it is to be understood that changes and 
variations may be made without departing from the spirit or scope of the 
present invention. For example, those skilled in the art may choose to 
modify the shapes of the lip or add additional lips to the inner concave 
surface in order to provide more air pockets.