Abstract:
A flying device which rotates as it travels through the air includes a body having three radially projecting vanes. Three blades or wings are pivotally connected to the three vanes. Each blade may be selectively and adjustably attached to an adjacent vane so that the blade projects outward from the body. When the flying device is thrown, the blades cause the aerial device to spin in a twirling motion. For storage or shipping, the blades may also be folded over so that they abut the body.

Description:
TECHNICAL FIELD 
     The present invention pertains generally to flying devices, and more particularly to a toy aerial device having adjustable blades which cause the device to spin when thrown. 
     BACKGROUND OF INVENTION 
     Devices which fly through the air are well known in the art. These range from airplanes to darts, and from rockets to boomerangs. In some cases such as model airplanes, the devices contain a power source which turns a propeller to force the device through the air. In other toys, such as gliders, the propelling force is provided by the user. Examples of the later category include: 
     U.S. Pat. No. 2,324,022 shows an aerial device of the boomerang type which has several arms. The blades of the device are entirely offset from the center of the assembly throughout their entire axes. The blades can be either the leading or trailing type. And the device provides a sound effect when the boomerang is in flight. 
     U.S. Pat. No. 3,361,988 illustrates a boomerang which has three folding blades. When the boomerang is thrown, the blades assume an in flight position wherein the blades are spaced apart by about 120°. 
     U.S. Pat. No. 2,972,481 discloses a rotating airfoil device which has interlocking blades. The device is fashioned from cardboard or other resilient sheet material. The device includes two blades which are mechanically interlocked, and which will not separate during flight. 
     U.S. Pat. No. 3,814,431 comprises a toy plastic boomerang having two interconnected wings arranged for free rotation on a vertical hollow handle with ballast therein to control the speed of descent. To propel, the user grasps one wing between the fingers so that the wings extend vertically with the handle extending laterally and throws the boomerang forward and vertically at a slight upward arc of approximately 45°. 
     U.S. Pat. No. 4,216,962 consists of a boomerang having a pair of elongated airfoils which are coupled together at their midsections to form a cross. Mechanism is provided for releasably coupling the midportions of the airfoils for separation under a predetermined force to normally prevent relative rotation of the airfoils. 
     SUMMARY OF INVENTION 
     The present invention is directed to a toy flying device (also referred to herein as an aerial device) which rotates or spins when it is thrown. The device can be used by a single user, or alternatively, by two users who throw the device back and forth. A preferred name is for the aerial device of the present invention is “TWIRLYBIRD”. The aerial device consists of a body which has three outwardly projecting vanes to which are attached,three blades or wings. When the device is thrown, the blades catch the air and cause the aerial device to spin. Changing the angle formed by the blades and body changes the flight characteristics of the aerial device. And, for storage or shipping, the aerial device may be conveniently folded so that the blades abut the body. 
     In accordance with a preferred embodiment of the invention, an aerial device includes a weighted body having a first end and an opposite second end, the body having at least three outwardly projecting vanes located at the first end. The aerial device further includes, at least three corresponding blades, each blade pivotally connected to a vane along an axis, so that the blades may be folded against the body. Each blade is also selectively connectable to an adjacent vane, so that during flight the blade projects outwardly from the body. 
     In accordance with an important aspect of the invention, hook and loop fasteners are utilized to selectively connect the blade to the adjacent vane. 
     In accordance with an important feature of the invention, the body has three vanes and three blades, one blade being connected to each vane. 
     In accordance with another important aspect of the invention, when the aerial device is in a ready for use configuration, the blades include two surfaces which intersect to form an obtuse angle. 
     Other features and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     FIG. 1 is a top plan view of an aerial device in accordance with the present invention; 
     FIG. 2 is a bottom plan view of the device; 
     FIG. 3 is a side elevation view along the line  3  of FIG. 1; 
     FIG. 4 is a reverse side elevation view along the line  4  of FIG. 1; 
     FIG. 5 is a perspective view of the device; 
     FIG. 6 is a side elevation view of blade A in a upright position; 
     FIG. 7 is a side elevation view of blade A folded into a flying position; 
     FIG. 8 is a side elevation view of blade B folded into a flying position; 
     FIG. 9 is a side elevation view of blade B folded to an upright position; 
     FIG. 10 is a side elevation view of blade B being folded to a stored position; 
     FIG. 11 is a side elevation view of blade B completely folded to a stored position; 
     FIG. 12 is a top plan view of the device with all blades folded to a stored position; 
     FIG. 13 is a side elevation view of the blades folded to a different flying position; 
     FIG. 14 is a reduced side elevation view of the device being thrown by a user; and, 
     FIG. 15 is an enlarged perspective view of a hinge connecting blade A to vane X. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring initially to FIGS.  1 — 5 , there are illustrated top plan, bottom plan, side elevation, reverse side elevation, and perspective views respectively of an aerial device in accordance with the present invention, generally designated as  20 . Aerial device  20  includes a weighted body  22  having a first end  24  and an opposite second end  25 . In a preferred embodiment, a weight  23  is attached near second end  25  of body. Body  22  has at least three radially projecting vanes.X, Y, and Z at first end  24 . Aerial device  20  also includes at least three corresponding blades A, B, and C, each blade pivotally connected to a vane along an axis, so that the blades may be folded against body  22  (refer also to FIG.  12 ). In the shown embodiment, blade A is pivotally connected to vane X along axis  26 , blade B is pivotally connected to vane Y along axis  28 , and blade C is pivotally connected to vane Z along axis  30 . In a preferred embodiment, the connection of the blades to the vanes can be made with a plastic hinge oriented along each of axes  26 ,  28 , and  30 . Each blade is selectively and releasably connectable to an adjacent vane, so that the blade projects outwardly from body  22  to assume an flying configuration. In FIG. 3 it is seen that the blades form an angle M with body  22 . Blade A is selectively connected to vane Z, blade B is selectively connected to vane X, and blade C is connected to vane Y. In a preferred embodiment, hook and loop fasteners  32  are utilized to selectively connect the blades to the adjacent vanes. One of hooks or loops is disposed on the vane at end  24 , and the other of hooks and loops is disposed on the back side of the blade. 
     It is further noted, that when the blades are connected to the adjacent vane or folded against the body, each blade is substantially comprised of two surfaces intersecting at an obtuse angle. For clarity, the surfaces of the blades and vanes have been nomenclatured. When thrown, the forward facing surfaces of blades A, B, and C are designated A 1 , A 2 , B 1 , B 2 , C 1 , and C 2 . The reward facing surfaces are designated A 3 , A 4 , B 3 , B 4 , C 3 , and C 4 . The surfaces of the vanes are similarly nomenclaured as X 1 , X 2 , Y 1 , Y 2 , Z 1 , and Z 2 . Using this nomenclature, it may be readily appreciated that surfaces A 2  and A 3  are pivotally connected to vane X, surfaces B 2  and B 3  are pivotally connected to vane Y, and surfaces C 2  and C 3  are pivotally connected to vane Z. And that for flight, surface A 4  selectively connects to surface Z 2 , surface B 4  selectively connects to surface X 2 , and surface C 4  selectively connects to surface Y 2 . 
     In the shown preferred embodiment, aerial device  20  includes three blades and body  22  has three vanes spaced 120° apart. The three blades are connected to the three vanes as is described above. It may be appreciated however that more blade/vane pairs could be included. For example, four blades could be connected to four vanes wherein the vanes are spaced 90° apart. 
     FIG. 6 is a side elevation view (along the line  3  of FIG. 1) of blade A in an upright position. Blades B and C have been omitted for clarity. Blade A has a lower unconnected edge  34  which extends along the bottom of surfaces A 1  and opposite surface A 4 . One of hook and loop fasteners  32  is disposed on surface A 4 , and the other of hook and loop fasteners  32  is disposed on surface Z 2 . 
     FIG. 7 is a side elevation view of blade A folded into a flying position. Blade A has been rotated in direction  36 , and the hook and loop fasteners on surfaces A 4  and Z 2  so that blade A forms an angle M with body  22 . It may be appreciated that blade A could have been folded so that angle M is greater or lesser. 
     FIG. 8 is a side elevation view (along the line  4  of FIG. 1) of blade B folded into a flying position. Blades A and C have been omitted for clarity. Blade B has a lower unconnected edge  38  which extends along the bottom of surfaces B 1  and opposite surface B 4 . One of hook and loop fasteners  32  is disposed on surface B 4 , and the other of hook and loop fasteners  32  is disposed on surface X 2 . Blade B forms an angle M with body  22 . 
     FIG. 9 is a side elevation view of blade B folded in direction  40  along axis  28  to an upright position. 
     FIG. 10 is a side elevation view of blade B continuing to be folded in direction  40  along axis  28  to a stored position. 
     FIG. 11 is a side elevation view of blade B completely folded in direction  40  along axis  28  to a stored position wherein surface B 3  abuts surface Y 2  of vane Y, and surface B 4  abuts surface Z 1  of vane Z. 
     FIG. 12 is a top plan view (in direction  4  of FIG. 1) of the aerial device  20  with all blades folded to a stored position. The three blades abut the surfaces of the three vanes. That is, surface A 3  abuts surface X 2 , surface A 4  abuts surface Y 1 , surface B 3  abuts surface Y 2 , surface B 4  abuts surface Z 1 , surface C 3  abuts surface Z 2 , and surface C 4  abuts surface Z 1 . 
     FIG. 13 is a side elevation view of the blades folded to a different flying position. The blades have been folded and connected to form an angle N with body  22  which is smaller than angle M shown in FIG. 3. A larger angle, such as angle M, results in a more streamlined aerial device that offers less air resistance, and thereby will generally go faster and travel further. Conversely, a smaller angle, such as N, results in a less streamlined aerial device that offer more air resistance, and thereby will generally go slower and travel a shorter distance. The angle which the blades form with the body can also affect the speed of rotation of the aerial device  20 . 
     FIG. 14 is a reduced side elevation view of aerial device  20  being thrown by a user  500 . The force of the air upon the blades cause aerial device  20  to rotate as it travels through the air. Referring again to FIG. 2, the direction of rotation will be counterclockwise when viewed from the front of aerial device  20 . 
     FIG. 15 is an enlarged perspective view of a hinge  50  pivotally connecting blade A to vane X. Similar hinges would connect blade B to vane Y, and blade C to vane Z. 
     The blades of aerial device  20  may be fabricated from any flexible sheet material. In a preferred embodiment, the blades are made from heavy duty paper of the “manila folder” type. The blades could also be fabricated from a sheet polymer. A hinge can also be utilized to connect the blades to the vanes. The body  22  of aerial device  20  can be fabricated from heavy duty paper, plastic, or wood, and should be more rigid than the blades. A piece of metal can be used as weight  23  to body  22 . 
     Aerial device  20  is used by connecting the three blades to the three adjacent vanes so that the three blades project outwardly forming an angle M with the body  22 . A user  500  grasps the body  22  and throws the aerial device  20  into the air second end  25  first. 
     To achieve a different flight profile, the user  500  adjusts the connection of the three blades with the three vanes so that the blades form a different angle N with the body  22 . 
     To store or ship aerial device  20 , the user  500  disconnects the three blades from the three adjacent vanes, and folds the three blades against the body  22 . 
     The preferred embodiments of the invention described herein are exemplary and numerous modifications, dimensional variations, and rearrangements can be readily envisioned to achieve an equivalent result, all of which are intended to be embraced within the scope of the appended claims.