TOY VEHICLE WITH STABILIZED FRONT WHEEL
A toy vehicle generally comprises a chassis, front and rear wheels supporting the chassis, and a flywheel configured to rotate within the front wheel to provide a gyroscopic effect. An engagement mechanism housed within and operatively coupled to the front wheel is configured to rotate the flywheel in a first direction when driven by the front wheel in the first direction. The engagement mechanism is also configured to allow the flywheel to continue to rotate in the first direction independently of the front wheel when the front wheel decelerates.
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This application is a continuation-in-part of application Ser. No. 11/085,341, filed Mar. 21, 2005, which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/586,561 to Hoeting et al., filed Jul. 9, 2004, the disclosures of which are incorporated by reference in their entirety.
FIELD OF THE INVENTIONThe present invention relates generally to a toy vehicle, and more particularly, to a toy vehicle with a stabilized front wheel.
BACKGROUND OF THE INVENTIONToy vehicles, and in particular toy motorcycles are generally known in the art. Toy motorcycles typically include a chassis supported along a longitudinal axis by front and rear wheels. Because a toy motorcycle must balance upon those two wheels, wind and other external forces can easily cause the toy motorcycle to fall over. For example, when a toy motorcycle is in motion, bumps in the terrain can cause the motorcycle to become off balance. Without the use of any stabilization system, toy motorcycles, and especially remotely controlled toy motorcycles, are difficult to operate and likely to fall over.
Several approaches have been tried to enhance a toy motorcycle's stability. For example, the stability of the motorcycle can be enhanced by utilizing a four-bar linkage steering mechanism as described and claimed in U.S. Pat. No. 6,095,891 (“the '891 patent”), issued to Hoeting et. al. and entitled “Remote Control Toy with Improved Stability.” The four-bar linkage projects a castering axis ahead of the front wheel to help stabilize the toy motorcycle, especially over rough terrain.
Gyroscopic flywheels can also enhance the stability of the toy wheels. For example, the '891 patent discloses a weighted flywheel assembly housed within and operatively associated with the rear wheel of the toy vehicle. A propulsion drive is operatively coupled to both the rear wheel and the flywheel assembly, and drivingly rotates both the rear wheel and the flywheel assembly. During operation, the flywheel assembly rotates substantially faster than the rear wheel thereby causing a gyroscopic effect that tends to prevent the toy vehicle from falling over.
While the stabilization approaches discussed above improve the stability of toy motorcycles, Applicants believe that stabilization can be achieved via other approaches as well.
SUMMARY OF THE INVENTIONThe present invention provides a toy vehicle with a flywheel operatively associated with a front wheel. The toy vehicle comprises a chassis having a front end supported by the front wheel and a rear end supported by a rear wheel.
In one embodiment, the flywheel is driven by a motor and rotates independently of the front wheel to generate a gyroscopic effect while the toy vehicle is moving. For example, the front wheel may be adapted to freely rotate about an axle that is fixedly attached to the front end of the chassis. The motor may be positioned in a motor mount that is fixedly connected to the axle such that the motor does not rotate about the axle. Accordingly, the front wheel rotates about the axle whenever the toy vehicle is in motion whereas the flywheel rotates about the axle whenever the motor is energized.
In another embodiment, an engagement mechanism is housed within and operatively coupled to the front wheel so as to be driven thereby. The engagement mechanism is configured to rotate the flywheel such that a separate motor, such as the one used in the other embodiment, is not required. More specifically, the engagement mechanism rotates the flywheel in a first direction when driven by the front wheel in the first direction, but allows the flywheel to continue to rotate in the first direction independently of the front wheel after the front wheel decelerates in the first direction. The flywheel may even continue to rotate in the first direction when the front wheel stops rotating in the first direction.
In one embodiment, the engagement mechanism includes a first component driven by the front wheel about a front axle of the toy vehicle and a second component coupled to the flywheel. The first component engages the second component when rotated in the first direction so that the flywheel also rotates in the first direction. When the front wheel and first component decelerate in the first direction, the second component ceases engaging the first component such that the flywheel continues to rotate in the first direction independently of the front wheel. The first and second components may also be configured to allow the front wheel to rotate in a second direction without the first component engaging the second component. To this end, the first and second components act as a one-way engagement mechanism.
BRIEF DESCRIPTION OF THE DRAWINGSThe accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with a general description of the invention given above, and the detailed description given below, serve to explain the invention.
With reference to
As shown in
To increase the operability of the toy vehicle 10, body extensions 48, such as foot pads, may extend outwardly from shell 30. The body extensions 48 are adapted to provide support for the chassis 12 when the toy vehicle 10 is on its side such that the rear wheel 26 remains in contact with the ground. Accordingly, the toy vehicle 10 can, in most situations, right itself when it is lying on its side without intervention from the operator. That is, upon application of drive power to the rear wheel 26, the toy vehicle 10 begins to spin in an arcuate path until the vehicle becomes upright and is able to operate on both its front and rear wheels 24, 26. This self-righting characteristic is attractive to the operator of the toy vehicle 10 because the operator does not have to walk over to where the toy vehicle 10 is on its side. Normally, the application of power to the rear wheel 26 is all that is required to get the toy vehicle 10 back into operation.
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Now referring more specifically to
With reference to
As shown in the figures, the flywheel assembly 28 includes a weighted flywheel 130, a flywheel plate 132, and a motor 134. The weighted flywheel 130 may be coupled to the flywheel plate 132 by screws 136 that extend through bores 138 in the flywheel plate 132 and anchor into corresponding threaded bores 140 (
In the embodiment shown in
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To operate the toy vehicle 10 shown in
The forward movement of the toy vehicle 10 is controlled by the rear drive motor 60, which may be any suitable lightweight motor but typically is a battery powered DC motor or a lightweight internal combustion engine. When the rear drive motor 60 is activated, the rear wheel 26 propels the toy vehicle 10 forward and the front wheel 24 freely rotates about the front axle 118. Because the flywheel assembly 28 is not coupled to the wheel halves 114, 116 and tire 112, the flywheel 130 and front wheel 24 rotate independently of each other. The rotational speed of the flywheel 130 is determined by type of motor 134, along with the sizes of the belt 156 and pulleys 152, 154 (or gears 162, 164) being used. These components may be chosen in a manner that enables the flywheel 130 to rotate substantially faster than the front wheel 24 during normal operation of the toy vehicle 10. This rotation of the flywheel 130 creates a gyroscopic effect that helps make the toy vehicle 10 less likely to fall over because of wind or other external forces, including rough terrain. For example, when the toy vehicle 10 encounters a bump along its path of motion, the gyroscopic effect helps keep the vehicle upright and maintain its current path of travel.
Additional stability is provided to the toy vehicle 10 by the castering axis 84. As shown in
Although the toy vehicle 10 could function without the assistance of an operator, it is contemplated that an operator will remotely control the toy vehicle 10 by means of a radio transmitter. For example, to initiate forward motion, the operator sends a propulsion signal which is received by receiver 66. The propulsion signal is then transmitted to the control board 64, which energizes rear drive motor 60. Accordingly, the forward motion of the toy vehicle 10 may be controlled by the operator sending an appropriate propulsion signal to the toy vehicle 10. Similarly, steering signals may also be transmitted by the operator to control the operation of the steering servo 62. Thus, by using a two-channel transmitter the operator can remotely and independently control both the forward motion and direction of the toy vehicle 10.
The motor 134 may be controlled with or without use of the remote radio transmitter. For example, the toy vehicle 10 may be adapted such that the motor 134 is activated whenever the switch 200 is placed in the “on” position. In such an embodiment the motor 134 operates independently of the two-channel transmitter and rotates the flywheel 130 about the front axle 118, even when the toy vehicle 10 is not in motion. Alternatively, the motor 134 may be operatively connected to the receiver 66 such that the motor 134 becomes operative when the receiver 66 receives a propulsion signal. By only activating the motor 134 when the toy vehicle is in motion, the toy vehicle helps prolong the operable life of power supply 58 by utilizing less energy over a given period of time. In a further embodiment, the control board 64 may have a timing mechanism adapted to deactivate the motor 134 after a predetermined time period of inactivity by the propulsion drive 54. Such an arrangement helps prolong the operable life of power supply 58 as well.
Rather than including a separate motor for rotating the flywheel 312, the toy vehicle 310 includes an engagement mechanism 316 housed within the front wheel 314 for rotating the flywheel 312. As shown in
As shown in
The front wheel 314 further includes a gear assembly 354 housed within a recess 356 defined by the wheel cap 328. The gear assembly 354 is retained in the recess 356 by a gear plate 358 secured to the wheel cap 328 by screws 360. Although a wide variety of configurations are possible, the gear assembly 354 shown in
As a result of this arrangement, the first component 318 is operatively engaged to the front wheel 314 so as to be driven thereby. Advantageously, the size of the planetary gear 362, central gear 364, and satellite gears 366, 368, 370 are selected such that one revolution of the front wheel 314 causes several revolutions of the first component 318. For example, the first component 318 may rotate between about five to ten times for each rotation of the front wheel 314. Additionally, the gear plate 358 confronts the second component 320 of the engagement mechanism 316 when the front wheel 314 is assembled to retain the first component 318 and first and second friction elements 344, 346 within the socket 342.
When the front wheel 314 and first component 318 decelerate in the first direction 388, the first and second friction elements 344, 346 release from engagement with the respective first and second arcuate portions 338, 340 and the outer rim 348 of the second component 320. This allows the second component 320 and flywheel 312 to continue rotating in the first direction 388 independently of the front wheel 314. Indeed, as shown in
The same relationship holds true when the first component 318 is rotated in a second direction 394, as shown in
The first and second friction elements 344, 346 shown in
The design of the embodiments of
While the present invention has been illustrated by the description of one or more embodiments thereof, and while the embodiments have been described in considerable detail, they are not intended to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. The invention in its broader aspects is therefore not limited to the specific details, representative apparatus and method and illustrative examples shown and described. Accordingly, departures may be made from such details without departing from the scope or spirit of the general inventive concept.
Claims
1. A toy vehicle, comprising:
- a chassis having front and rear ends;
- front and rear wheels operatively connected to and supporting the respective front and rear ends, the front wheel being moveable to steer the toy vehicle;
- a flywheel configured to rotate within the front wheel; and
- an engagement mechanism including a first component housed within and operatively coupled to the front wheel so as to be driven thereby and a second component coupled to the flywheel so as to rotate therewith, the first component being configured to engage the second component when driven by the front wheel in a first direction so that the flywheel is rotated in the first direction as well, the second component being configured to cease engaging the first component when the front wheel decelerates in the first direction such that the flywheel continues to rotate in the first direction independently of the front wheel.
2. The toy vehicle of claim 1, the front wheel having a front axis, the first component including a first arcuate portion rotatable about the front axis and the second component defining a socket in which the first arcuate portion rotates, the engagement mechanism further comprising:
- a first friction element configured to frictionally engage the first arcuate portion and an outer rim of the socket when the first component is rotated in the first direction, the first friction element further configured to cease engaging the first arcuate portion and the outer rim when the front wheel decelerates in the first direction.
3. The toy vehicle of claim 2, the first friction element being a spherical ball positioned within the socket.
4. The toy vehicle of claim 2, the first friction element being a cylindrical disc positioned within the socket.
5. The toy vehicle of claim 2, the first component including a second arcuate portion, the engagement mechanism further comprising:
- a second friction element configured to frictionally engage the second arcuate portion and the outer rim of the socket when the first component is rotated in the first direction, the second friction element further configured to cease engaging the first arcuate portion and the outer rim when the front wheel decelerates in the first direction.
6. The toy vehicle of claim 1, the first component being a paw wheel having an arm extending therefrom, and the second component defining a socket in which the paw wheel rotates, the socket having a plurality of notches configured to engage the arm when the paw wheel is rotated in the first direction.
7. The toy vehicle of claim 6, the arm being a resilient arm, wherein the paw wheel includes a plurality of the resilient arms.
8. The toy vehicle of claim 1, the first component being a ratchet wheel having a plurality of projections and the second component being a ratchet tab pivotally connected to the flywheel, the ratchet tab configured to engage one of the plurality of projections when the ratchet wheel is rotated in the first direction and configured to be deflected by the plurality of projections when the ratchet wheel is rotated in a second direction.
9. The toy vehicle of claim 8, the ratchet tab being biased against the ratchet wheel.
10. The toy vehicle of claim 1, wherein the first component of the engagement mechanism is operatively coupled to the front wheel by a gear train, the gear train being configured to rotate the first component at a faster rate than the front wheel thereby causing the flywheel to rotate faster than the front wheel.
11. The toy vehicle of claim 1, the first and second components of the engagement mechanism being configured to allow the front wheel to rotate in a second direction independently of the flywheel.
12. The toy vehicle of claim 1, further comprising:
- a front fork operatively connecting the front wheel to the front end of the chassis, the front fork having substantially parallel first and second members operatively connected to each other; and
- a steering drive supported by the chassis and operatively connected to the front fork, the steering drive being adapted to generate steering outputs to steer the toy vehicle.
13. The toy vehicle of claim 13, further comprising:
- a fork coupler pivotally connected to the front end of the chassis, the front fork being connected to the fork coupler so as to pivot about a castering axis;
- wherein the toy vehicle travels on a surface and the castering axis projects ahead of where the front wheel contacts the surface.
14. The toy vehicle of claim 1, further comprising:
- a propulsion drive operatively associated with the chassis and drivingly coupled to the rear wheel.
15. A toy vehicle, comprising:
- a chassis having front and rear ends;
- front and rear wheels operatively connected to and supporting the respective front and rear ends, the front wheel being moveable to steer the toy vehicle;
- a flywheel configured to rotate within the front wheel; and
- an engagement mechanism housed within and operatively coupled to the front wheel so as to be driven thereby, the engagement mechanism being configured to rotate the flywheel in a first direction when driven by the front wheel in the first direction;
- wherein the engagement mechanism is further configured to allow the flywheel to independently rotate in the first direction when the front wheel decelerates in the first direction.
16. The toy vehicle of claim 16, the engagement mechanism being operatively coupled to the front wheel by a gear train, the gear train being configured to allow the engagement mechanism to rotate the flywheel at a faster rate than the front wheel.
17. The toy vehicle of claim 16, the engagement mechanism being configured to allow the front wheel to rotate in a second direction independently of the flywheel.
18. A toy vehicle, comprising:
- a chassis having first and second ends;
- first and second wheels operatively connected to and supporting the respective first and second ends;
- a flywheel configured to rotate within the first wheel; and an engagement mechanism including a first component housed within and operatively coupled to the first wheel so as to be driven thereby and a second component coupled to the flywheel so as to rotate therewith, the first component being configured to engage the second component when rotated in a first direction by the first wheel so that the flywheel is rotated in the first direction as well, the second component being configured to cease engaging the first component when the first wheel decelerates in the first direction such that the flywheel continues to rotate in the first direction independently of the first wheel.
Type: Application
Filed: Apr 17, 2007
Publication Date: Sep 6, 2007
Applicant: BANG ZOOM DESIGN LTD. (Cincinnati, OH)
Inventors: Michael Hoeting (Cincinnati, OH), Neil Hamilton (Taylor Mill, KY)
Application Number: 11/736,349
International Classification: A63H 17/21 (20060101);