PROJECTILE FLIER

Abstract

A projectile flier has a flying body, a propeller device mounted on the flying body and an actuator detachably combined to the flying body to rotate the propeller device. The flying body has a tube located at its gravity center to rotatably combine with an axis of the propeller device. The actuator has a handle with a pulling device that efficiently drives the axis of the propeller device to rotate. Until the propeller device rotates at high speed to provide efficient floating force, the flying body disengages from the actuator and flies into sky. By efficiently rotating the propeller device with the pulling device, rotation speed of the propeller device is significantly increased to make the flying body fly over a long period and a far distance.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a preferred embodiment of a projectile flier in accordance with the present invention;

FIG. 2 is a perspective view of another preferred embodiment of the projectile filer in accordance with the present invention;

FIG. 3 is cross-sectional side view of a joint of a flying body and a propeller wheel in the projectile flier; and

FIG. 4 is a cross-sectional side view of an actuator of the projectile flier in FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A projectile flier in accordance with the present invention comprises a flying body, a propeller device mounted on the flying body and an actuator detachably combined to the flying body. The flying body has a tube located at its gravity center to rotatably combine with an axis of the propeller device. The actuator comprises a handle with a pulling device that efficiently drives the axis of the propeller device to rotate. Until the propeller device rotates at high speed to provide efficient floating force, the flying body disengages from the actuator and flies into sky. By efficiently rotating the propeller device with the pulling device, rotation speed of the propeller device is significantly increased to make the flying body fly over a long period and a far distance.

With reference to FIGS. 1 and 2, two preferred embodiments of the projectile fliers respectively have two types of actuators 30a, 30b in different shapes, one is substantially tubular and the other is substantially handle-shaped. Each embodiment of the projectile flyer comprises a flying body 10, a propeller device 20 and one of the actuator 30a, 30b, wherein the flying body 10 is helicopter-shaped to present a mini model of helicopter and catch a kid's interest. Design of the flying body 10 and the propeller device 20 in size is based on the formula: Sv=Kv×S×b/Lv to define relationship of a tail 12 of the flying body 10 and the propeller device 20. Wherein, Sv is the side area of tail 12, Kv is the coeffient for this formula, S is the area of the propeller device, b is the diameter of the propeller device and Lv is the distance from center of the propeller device to the wind pressure center on the tail (efficient moment arm).

As shown in FIG. 3, a joint of the flying body 10 and the propeller device 20 is shown. The flying body 10 has a tube 13 with an axial hole 14 secured at its top. The axial hole 14 is provided to rotatably engage with an axis 22 of the propeller device 20. Particularly, the tube 13 has to be located at a gravity center of the flying body 10 to keep the flying body 10 stable during flying. Moreover, the flying body 10 is selectively added with some weighting elements (not shown) therein to adjust the gravity center exactly.

The propeller device 20 is a propeller wheel comprises the axis 22, multiple blades 23 and a rim 21. The multiple blades 23 are radially connected to the axis 22. Each blade 23 is a strip inclined about 3 to 7 degrees from the axis 22 to the rim 21 upwardly. The axis 22 extends downward and has a middle portion, a lower portion, a neck 24 defined at the middle portion and a fastener 15 attached at the neck 24 to keep the propeller device 20 from detaching from the tube 13 of the flying body 10. The lower portion of the axis 22 further has an engaging portion 25 in form of cylinder to detachably engage the actuator 30a, 30b.

As shown in FIG. 4, the actuator 30b in FIG. 2 is shown in a cross-section side view. The actuator 30b comprises a handle 302, a chamber 304 formed on the handle 302, a holding portion 35 rotatably mounted on the chamber 304, a reeling assembly received inside the chamber 304, and an optional rewinding device accommodated inside the handle 302. The holding portion 35 has a recess detachably and snugly combined with the engaging portion 25 of the propeller device 20. The reeling assembly comprises a reel 31 rotatably received inside the chamber 304, a string 32 winding on the reel 31 and pulling tag 33 attached to a free end of the string 32. The reel 31 has one end combined with the holding portion 35 and another end attached to the rewinding device within the handle 302. The rewinding device is simply a rubber band 34 resiliently connected between the reel 31 and a bottom of the handle 302 to keep the string 32 winding on the reel 31.

When the projectile flier is assembled, the axis 22 of the propeller device 20 penetrates the tube 13 of the flying body 10 and engages the fastener 15, i.e. an O-ring, at the neck 24 to keep the propeller device 20 secured on the flying body 10. When the projectile flier is operated, the engaging portion 25 of the axis 22 is inserted into the recess of the holding portion 35 on the actuator 30 to temporarily mount on the actuator 30. The string 32 is pulled outward by holding the pulling tag 33 to drive the reel 31 to rotate and then to rotate the propeller device 20 simultaneously. When the propeller device 20 creates enough floating force, the propeller device 20 with the flying body 10 disengages from the actuator 30b. Because the string 32 can be pulled quickly to rotate the propeller device 20 at high speed and with multiple circulations, inertia force of the propeller device 20 is strong to make the flying body 10 fly longer and further than conventional one created by hand operation. Meanwhile, the rubber band 34 is twisted when the string 32 is pulled out so that the rubber band 34 provides a restitution force to the reeling assembly to rewind the string 32 on the reel 31 after releasing the pulling tag 33. Therefore, operation of the projectile flier is effort-saving and convenient.

Although this invention has been described in its preferred form with a certain degree of particularity, it is understood that the present invention of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts any be resorted to without departing from the spirit and scope of the invention.

Claims

1. A projectile filer comprising: a flying body having a tube mounted at a gravity center of the flying body;a propeller device rotatably mounted on the flying body and having an axis penetrating the tube of the flying body; andan actuator detachably engaged with the axis on the flying body and driving propeller device to rotate, the actuator having:a handle;a chamber defined in the handle; anda reeling assembly received inside the chamber to operationally drive the propeller device.

2. The projectile flier as claimed in claim 1, wherein the reeling assembly comprises: a rewinding device received inside the handle;a holding portion rotatably mounted on the chamber and having a recess detachably engaged the axis of the propeller device;a reel having one end combining the holding portion and another end combining the rewinding device;a string winding on the reel to operationally drive the reel to rotate; anda pulling tag attached to a free end of the string.

3. The projectile flier as claimed in claim 2, wherein the rewinding device is a rubber band connected between the reel and a bottom of the handle to provide a restitution force to the reeling assembly.

4. The projectile flier as claimed in claim 1, wherein the propeller device comprises the axis, multiple blades radially attached to the axis and a rim connected to distal ends of the blades to perform a propeller wheel.

5. The projectile flier as claimed in claim 1, wherein the flying body is helicopter-shaped.

6. The projectile flier as claimed in claim 1, wherein the axis of the propeller device further has a middle portion, a neck defined at the middle portion and a fastener mounted at the neck to avoid the propeller device disengaging from the flying body.