US20070207699A1 - Toy vehicle with stabilized front wheel - Google Patents
Toy vehicle with stabilized front wheel Download PDFInfo
- Publication number
- US20070207699A1 US20070207699A1 US11/736,349 US73634907A US2007207699A1 US 20070207699 A1 US20070207699 A1 US 20070207699A1 US 73634907 A US73634907 A US 73634907A US 2007207699 A1 US2007207699 A1 US 2007207699A1
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- United States
- Prior art keywords
- toy vehicle
- wheel
- component
- flywheel
- front wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H17/00—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor
- A63H17/16—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor in the form of a bicycle, with or without riders thereon
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H17/00—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor
- A63H17/21—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor shaped as motorcycles with or without figures
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H17/00—Toy vehicles, e.g. with self-drive; ; Cranes, winches or the like; Accessories therefor
- A63H17/26—Details; Accessories
- A63H17/262—Chassis; Wheel mountings; Wheels; Axles; Suspensions; Fitting body portions to chassis
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
- A63H29/00—Drive mechanisms for toys in general
- A63H29/20—Flywheel driving mechanisms
Definitions
- the present invention relates generally to a toy vehicle, and more particularly, to a toy vehicle with a stabilized front wheel.
- Toy 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.
- 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.
- 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.
- 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.
- the 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- FIG. 1 is a side view, partially cut away, of one embodiment of a toy motorcycle according to the invention
- FIG. 2 is a side view similar to FIG. 1 showing internal components of the toy motorcycle;
- FIG. 3 is a top view of the toy motorcycle in FIG. 1 showing the operation of the steering servo;
- FIGS. 4A and 4B are exploded perspective views of the front wheel of the toy motorcycle shown in FIG. 1 ;
- FIG. 5 is an exploded perspective view similar to FIG. 4A showing an alternate flywheel design
- FIG. 6 is a cross-section view of the front wheel of the toy motorcycle shown in FIG. 1 ;
- FIG. 7 is a cross-section view similar to FIG. 6 showing an alternate front fork design
- FIG. 8 is a side view similar to FIG. 1 showing a toy motorcycle with an engagement mechanism and flywheel according to an alternative embodiment of the invention
- FIG. 9 is an exploded perspective view of the front wheel of the toy motorcycle shown in FIG. 8 ;
- FIGS. 10A-10C are schematic views illustrating the operation of the engagement mechanism shown in FIG. 8 ;
- FIGS. 11A and 11B are schematic views illustrating the operation of an engagement mechanism according to another embodiment of the invention.
- FIGS. 12A and 12 are schematic views illustrating the operation of an engagement mechanism according to yet another embodiment of the invention.
- a toy vehicle 10 is shown according to the present invention.
- the toy vehicle 10 is a toy motorcycle, and in particular, a remote-controlled toy motorcycle.
- the toy vehicle 10 includes a chassis 12 that has front and rear ends 14 , 16 , a front fork 18 operatively connected to the front end 14 , and a rear suspension 20 operatively connected to the rear end 16 .
- the front fork 18 is supported by a front wheel 24 that is adapted to steer the toy vehicle 10 in a desired direction.
- the rear suspension 20 is supported by a rear wheel 26 .
- a flywheel assembly 28 is operatively associated with the front wheel 24 to stabilize the toy vehicle 10 when the toy vehicle is moving. The flywheel assembly 28 will be explained in greater detail below.
- the chassis 12 includes a decorative shell or casing 30 that covers the internal components of the toy vehicle 10 and defines the general shape of the chassis 12 .
- the components of an actual motorcycle may be depicted graphically on the shell 30 to increase the aesthetic value and consumer appeal of the toy motorcycle 10 .
- an engine 34 , transmission assembly 36 , drive chain 38 , and body frame 40 are all depicted graphically on shell 30 in FIG. 1 , even though none of those features are functional.
- the toy vehicle 10 may also include a simulated rider (not shown) sitting upon the chassis 12 and gripping handlebars 42 which are attached to the front end 14 .
- body extensions 48 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.
- the chassis 12 supports numerous internal components, such as a propulsion drive 54 and a steering drive 56 , that are enclosed or covered by the shell 30 . More specifically, the chassis 12 supports a power supply 58 , a rear drive motor 60 , and a steering servo 62 , which are all electrically coupled to a control board 64 that is supported on the chassis 12 as well.
- the control board 64 may also be electrically coupled to a receiver 66 located in the chassis 12 for receiving radio signals from a remotely-located radio transmitter (not shown). The radio signals may be received by an external antenna 67 that is positioned on the chassis 12 and coupled to the receiver 66 .
- a gear drive assembly 68 connects the rear drive motor 60 to the rear wheel 26 .
- the rear drive motor 60 transmits power through the gear drive assembly 68 , which in turn rotates the rear wheel 26 to propel the toy vehicle 10 forward.
- the gear drive assembly 68 may be replaced with a drive belt system, a chain drive, or some other means that drivingly couples the propulsion drive 54 to the rear wheel 26 .
- the steering drive 56 is operatively connected to the front fork 18 , which includes substantially parallel first and second members 76 , 78 ( FIGS. 4A and 4B ) spaced about the front wheel 24 .
- the first and second members 76 , 78 are both connected to one or more fork couplers 80 , which in turn are pivotally connected to the front end 14 of the chassis 12 by a pivot pin 82 .
- the front fork 18 pivots about an axis 84 .
- the axis 84 may also be referred to as a castering axis 84 for reasons discussed in more detail below.
- the steering drive 56 includes the steering servo 62 and a steering arm 90 , which is pivotally connected to the steering servo 62 at pivot point 92 .
- a link 94 is connected between steering arm 90 and flange 98 , which is fixedly coupled to the second member 78 of the front fork 18 .
- the steering servo 62 generates steering outputs that move the steering arm 90 , which in turn moves link 94 either backwards or forwards depending on the desired direction for the toy vehicle 10 .
- link 94 when link 94 moves, the front fork 18 pivots about castering axis 84 such that the toy vehicle 10 will turn either left or right relative to longitudinal axis 102 .
- the link 94 may be pivotally connected to the fork coupler 80 or directly to a portion of the front fork 18 .
- the front wheel 24 comprises an outer tire 112 that surrounds first and second wheel halves 114 , 116 .
- the wheel halves 114 , 116 are supported on a front axle 118 and may be held together by screws 119 that extend through bores 120 in the first wheel half 114 and into threaded bores 122 ( FIG. 6 ) in the second wheel half 116 .
- the bores 120 and 122 are positioned around the periphery of the respective first and second wheel halves 114 , 116 such that the wheel halves 114 , 116 may be assembled around the flywheel assembly 28 .
- the flywheel assembly 28 may be encased between the wheel halves 114 , 116 and housed within the front wheel 24 .
- 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 ( FIG. 6 ) on the flywheel 130 .
- the flywheel plate 132 is driven by the motor 134 , which is positioned within a motor mount 144 .
- the flywheel plate 132 and flywheel 130 are adapted to rotate within the front wheel 24 to create a gyroscopic effect.
- the flywheel plate 132 is adapted to rotate about the front axle 118 , which is fixably attached to the first and second members 74 , 78 of front fork 18 .
- the motor mount 144 is operatively connected to the fixed front axle 118 such that it does not rotate about the axle 118 .
- a hexagonal portion 145 of the front axle 118 may cooperate with a hexagonal bore 146 in motor mount 144 to prevent motor mount 144 from rotating about the axle 118 .
- Wires 148 electrically couple the motor 134 to the power supply 58 of toy vehicle 10 . As discussed below, the wires 148 may be routed through hollow cavities in the front axle 118 and front fork 18 .
- the motor 134 is drivingly coupled to the flywheel plate 132 by a belt drive system 150 .
- the belt drive system 150 includes a pulley 152 coupled to the flywheel plate 132 and a pulley 154 connected to the motor 134 .
- a belt 156 connects pulley 152 to pulley 154 such that when the motor 134 is energized, the flywheel plate 132 and weighted flywheel 130 spin about the front axle 118 .
- FIG. 5 shows an alternate configuration of the flywheel assembly 28 .
- the pulley 152 of FIGS. 4A and 4B is replaced with a gear 162 .
- the pulley 154 of FIGS. 4A and 4B is replaced with a gear 164 .
- the gears 162 and 164 are sized such that they engage one another and the belt 156 in FIGS. 4A and 4B is eliminated. In other words, when motor 134 is energized, gear 164 drives gear 162 to rotate the flywheel plate 132 and weighted flywheel 130 .
- FIG. 6 shows the fully assembled front wheel 24 and flywheel assembly 28 .
- the wires 148 may be advantageously routed through hollow cavities 168 and 170 in the front fork 18 and front axle 118 , respectively. Such an arrangement prevents the wires 148 from interfering with the rotation of the front wheel 24 or flywheel 130 .
- the first member 76 may include a hollow cavity as well.
- the hollow cavity 170 in the front axle 118 would extend substantially across the entire length of the axle 118 to allow wires to be routed through both the first and second members 76 , 78 before being coupled to the motor 134 .
- the wires 148 could be routed on the outside of the front fork 18 and enter the hollow cavity 170 through the end of axle 118 .
- first and second members 76 , 78 of front fork 18 may be adapted to conduct electricity.
- first and second members 76 , 78 form part of the electrical circuit which provides current to the motor 134 .
- This arrangement eliminates the need to route wires through hollow cavities in the front fork 18 .
- a first set of wires 174 may be used to operatively connect the power supply 58 to a first end 18 a of front fork 18
- a second set of wires 176 may be used to operatively connect a second end 18 b of front fork 18 to the motor 134 .
- the first and second sets of wires 174 , 176 are each comprised of a positive wire 180 and a negative wire 182 .
- the first and second members 76 , 78 are comprised of respective upper shock bodies 184 , 186 and lower shock shafts 188 , 190 .
- the positive and negative wires 180 , 182 are electrically coupled to metal plates 192 located in the shock bodies 184 and 186 .
- the plates 192 transfer any current to springs 194 , which in turn transfer current to lower shock shafts 188 and 190 .
- Current may also be transferred through these components in the opposite direction. Accordingly, such an arrangement allows current to flow from the power supply 58 to the motor 134 via the negative wire 182 and second member 78 , and back to the power supply 58 via the positive wire 180 and first member 76 .
- both the positive and negative wires 180 , 182 at the first end 18 a of front fork 18 may be routed through the pivot pin 82 .
- the user places a switch 200 in an “on” position to send power from the power supply 58 to the control board 64 .
- the power supply 58 may be any suitable power source, such as rechargeable batteries.
- the control board 64 may then energize the motor 134 via the wires 148 . Because the front axle 118 is fixedly connected to the front fork 18 and the motor mount 144 is secured to the front axle 118 , the motor 134 does not rotate about the front axle 118 when activated. Instead, the motor 134 drives pulley 154 , which in turn drives belt 156 and pulley 152 in order to rotate the flywheel plate 132 about the front axle 118 . As discussed below, the rotation of the flywheel 130 with the flywheel plate 132 increases the stability of the toy vehicle 10 by creating a gyroscopic effect when the toy vehicle 10 is in motion.
- 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.
- the rear drive motor 60 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 .
- the flywheel assembly 28 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.
- flywheel 130 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.
- the toy vehicle 10 travels on a surface 210 and the castering axis 84 projects ahead of where the front wheel 24 contacts the surface 210 .
- Such an arrangement provides a positive caster with a trail 220 , which represents the distance between where the castering axis 84 intersects the travel surface 210 and the contact point of the front wheel 24 with the travel surface 210 .
- the castering axis 84 effectively pulls the front wheel 24 along the toy vehicle's path of motion.
- this castering effect or force tends to realign the front wheel 24 with the toy vehicle's path of motion when the front wheel 24 deviates therefrom due to rough terrain or the like.
- 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.
- 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 .
- steering signals may also be transmitted by the operator to control the operation of the steering servo 62 .
- 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.
- the toy vehicle 10 may be adapted such that the motor 134 is activated whenever the switch 200 is placed in the “on” position.
- 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.
- 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.
- 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.
- FIG. 8 illustrates an alternative embodiment of a toy vehicle 310 having a flywheel 312 configured to rotate within a front wheel 314 to generate a gyroscopic effect.
- the components of the toy vehicle 310 other than those housed within the front wheel 314 may be the same as those discussed above with reference to FIGS. 1-7 . Accordingly, like reference numbers are used in FIG. 8 to refer to like elements from the embodiment shown FIGS. 1-7 .
- the toy vehicle 310 includes an engagement mechanism 316 housed within the front wheel 314 for rotating the flywheel 312 .
- the engagement mechanism 316 generally includes a first component 318 operatively coupled to the front wheel 314 and a second component 320 coupled to the flywheel 312 .
- the front wheel 314 includes a wheel housing 326 , a cap 328 secured to the wheel housing 326 by screws 330 , an outer tire 332 surrounding the wheel housing 326 , and a front axle 334 fixedly connected to the front fork 18 ( FIG. 8 ) and rotatably supporting the wheel housing 326 and cap 328 .
- the front wheel 314 may alternatively comprise first and second wheel halves (not shown) surrounded by the outer tire 332 so as to be constructed in a similar manner as the front wheel 24 ( FIG. 4A ).
- the first component 318 is a generally circular member having a first semi-circular wing or arcuate portion 338 offset from a second semi-circular wing or arcuate portion 340 .
- the second component 320 is a generally cylindrical boss secured to or integrally formed with the flywheel 312 and defines a socket 342 for receiving the first component 318 .
- First and second friction elements 344 , 346 which may be spherical balls, are received within the socket 342 between an outer rim 348 and the first component 318 .
- the first and second friction elements 344 , 346 enable the first component 318 to engage the second component 320 to rotate the flywheel 312 , as will be described in greater detail below.
- 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 .
- the gear assembly 354 shown in FIG. 9 includes a planetary gear 362 , a central gear 364 , and first, second, and third satellite gears 366 , 368 , 370 .
- the planetary gear 362 is fixedly attached to the front axle 334 by a set screw (not shown) or the like such that it remains stationary with the front axle 334 when the front wheel 314 rotates.
- the first, second, and third satellite gears 366 , 368 , 370 are rotatably mounted on respective first, second, and third axles 372 , 374 , 376 , which engage the gear plate 358 via respective first, second, and third througholes 378 , 380 , 382 .
- the gear plate 358 causes the satellite gears 366 , 368 , 370 to rotate as well.
- the satellite gears 366 , 368 , 370 rotate the central gear 364 , which extends through a central opening 384 in the gear plate 358 and engages the first component 318 of the engagement mechanism 316 .
- the first component 318 is operatively engaged to the front wheel 314 so as to be driven thereby.
- 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 .
- the first component 318 may rotate between about five to ten times for each rotation of the front wheel 314 .
- 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 .
- FIGS. 10A through 10C illustrate the operation of the engagement mechanism 316 in further detail.
- the first component 318 When rotated in a first direction 388 , the first component 318 causes the first friction element 344 to frictionally engage the first arcuate portion 338 and outer rim 348 so as to become wedged therebetween.
- the second friction element 346 likewise frictionally engages the second arcuate portion 340 and the outer rim 348 so as to become wedged therebetween.
- This positive engagement enables the first component 318 to rotate the second component 320 and flywheel 312 in the first direction 388 .
- This positive engagement differs from other engagement mechanism where one member may slip along another member before full engagement occurs, such as in a traditional centrifugal clutch.
- the first component 318 advantageously rotates at a faster rate than the front wheel 314 because of the gear assembly 354 . Consequently, the flywheel 312 rotates at a faster rate as well to generate gyroscopic forces that stabilize the toy vehicle 310 .
- 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 FIG. 10B , the second component 320 and flywheel 312 may even continue to rotate in the first direction 388 when the front wheel 314 is stopped.
- the configuration of the first component 318 ensures that the first and second friction elements 344 , 346 remain loosely positioned within the socket 342 so as to cause minimal interference with the continued rotation of the second component 320 .
- the continued rotation of the second component 320 faster than the first component 318 urges the first friction element 344 toward a planar surface 390 and the second friction element 346 toward a planar surface 392 anytime the first and second friction elements 344 , 346 contact the outer rim 348 .
- the planar surfaces 390 , 392 of the first component 318 extend toward the outer rim 348 in a direction substantially perpendicular to a tangent (not shown) of the outer rim 348 .
- the first and second friction elements 344 , 346 do not become wedged between the planar surfaces 390 , 392 and the outer rim 348 .
- the planar surfaces 390 , 392 come into contact with the respective first and second friction elements 344 , 346 , which simply roll within the socket 342 so as to not impede the rotation of the first component 318 .
- the engagement mechanism 316 acts as a one-way engagement mechanism.
- the first and second friction elements 344 , 346 shown in FIGS. 8-10C are spherical balls. It will be appreciated, however, that many other shapes and configurations are possible.
- the first and second friction elements 344 , 346 may alternatively be cylindrical discs (not shown) retained in the socket 342 by the gear plate 358 .
- first and second friction elements are shown in the figures, it will be appreciated that only a single friction element is required to cause engagement between the first and second components 318 , 320 .
- the first and second components 318 , 320 may be configured to cooperate with more than two friction elements.
- FIGS. 11A and 11B illustrate an engagement mechanism 410 according to an alternative embodiment.
- the first component is a ratchet wheel 412 having a plurality of projections 414 along its outer perimeter and the second component is a ratchet tab 416 pivotally connected to the flywheel 412 .
- the ratchet tab 416 positively engages one of the projections 414 when the ratchet wheel 412 is rotated in the first direction 388 ( FIG. 11A ). There is no slippage between the ratchet tab 416 and projections 414 during the engagement process. To facilitate this engagement, the ratchet tab 416 may be normally biased against the ratchet wheel 412 .
- the ratchet wheel 412 rotates the flywheel 312 when driven in the first direction 388 by the front wheel 314 .
- the flywheel 312 is able to continue rotating in the first direction 388 independently of the ratchet wheel 412 because the ratchet tab 416 is simply deflected by (rather than engaged by) the projections 414 as it passes over them.
- the flywheel 312 may continue to rotate in the first direction 388 even when the front wheel 314 is stopped.
- the ratchet wheel 412 and ratchet tab 416 may or may not be positioned in a socket 418 similar to the socket 342 in FIGS. 8-10C .
- FIGS. 12A and 12B illustrate an engagement mechanism 430 according to yet another embodiment.
- the first component is a paw wheel 432 having one or more arms 434 extending therefrom and the second component is a cylindrical boss 436 coupled to the flywheel 312 .
- the cylindrical boss 436 defines a socket 438 for receiving the paw wheel 432 and includes a plurality of notches 440 shaped to cooperate with the arms 434 of the paw wheel 432 .
- each arm 434 positively engages an engagement surface 442 on one of the notches 440 so that the cylindrical boss 436 and flywheel 312 are rotated in the first direction 388 as well.
- the notches 440 release from engagement with the arms 434 to allow the cylindrical boss 436 and flywheel 312 to continue to rotate in the first direction 388 independently of the front wheel 314 and paw wheel 432 .
- the notches 440 may include guide surfaces 444 that contact the arms 434 during this relative rotation, but the guide surfaces 444 simply cause the arms 434 to flex inwardly so as to cause minimal interference with the relative rotation.
- the arms 434 may be resilient.
- FIGS. 8-12B The design of the embodiments of FIGS. 8-12B assists the toy vehicle right itself, i.e, standup, from a tipped over position without user intervention, especially in the situation when the flywheel is stopped or slowly spinning.
- the front wheel and the stopped or nearly stopped flywheel resists being rotated.
- the front wheel is able to overcome the caster affect and turn sharper than it normally would. Consequently, the bike will turn in a tighter radius and create enough centrifugal force in the toy vehicle to cause the toy vehicle to lift off its side and onto two wheels quicker than without the resistance of the flywheel.
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- Toys (AREA)
Abstract
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.
Description
- 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.
- The present invention relates generally to a toy vehicle, and more particularly, to a toy vehicle with a stabilized front wheel.
- Toy 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.
- The 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.
- The 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.
-
FIG. 1 is a side view, partially cut away, of one embodiment of a toy motorcycle according to the invention; -
FIG. 2 is a side view similar toFIG. 1 showing internal components of the toy motorcycle; -
FIG. 3 is a top view of the toy motorcycle inFIG. 1 showing the operation of the steering servo; -
FIGS. 4A and 4B are exploded perspective views of the front wheel of the toy motorcycle shown inFIG. 1 ; -
FIG. 5 is an exploded perspective view similar toFIG. 4A showing an alternate flywheel design; -
FIG. 6 is a cross-section view of the front wheel of the toy motorcycle shown inFIG. 1 ; -
FIG. 7 is a cross-section view similar toFIG. 6 showing an alternate front fork design; -
FIG. 8 is a side view similar toFIG. 1 showing a toy motorcycle with an engagement mechanism and flywheel according to an alternative embodiment of the invention; -
FIG. 9 is an exploded perspective view of the front wheel of the toy motorcycle shown inFIG. 8 ; -
FIGS. 10A-10C are schematic views illustrating the operation of the engagement mechanism shown inFIG. 8 ; -
FIGS. 11A and 11B are schematic views illustrating the operation of an engagement mechanism according to another embodiment of the invention; and -
FIGS. 12A and 12 are schematic views illustrating the operation of an engagement mechanism according to yet another embodiment of the invention. - With reference to
FIGS. 1 and 2 , atoy vehicle 10 is shown according to the present invention. As illustrated and described herein, thetoy vehicle 10 is a toy motorcycle, and in particular, a remote-controlled toy motorcycle. Thetoy vehicle 10 includes achassis 12 that has front andrear ends front fork 18 operatively connected to thefront end 14, and arear suspension 20 operatively connected to therear end 16. Thefront fork 18 is supported by afront wheel 24 that is adapted to steer thetoy vehicle 10 in a desired direction. Therear suspension 20 is supported by arear wheel 26. Aflywheel assembly 28 is operatively associated with thefront wheel 24 to stabilize thetoy vehicle 10 when the toy vehicle is moving. Theflywheel assembly 28 will be explained in greater detail below. - As shown in
FIG. 1 , thechassis 12 includes a decorative shell or casing 30 that covers the internal components of thetoy vehicle 10 and defines the general shape of thechassis 12. The components of an actual motorcycle may be depicted graphically on theshell 30 to increase the aesthetic value and consumer appeal of thetoy motorcycle 10. For example, anengine 34,transmission assembly 36,drive chain 38, andbody frame 40 are all depicted graphically onshell 30 inFIG. 1 , even though none of those features are functional. Thetoy vehicle 10 may also include a simulated rider (not shown) sitting upon thechassis 12 andgripping handlebars 42 which are attached to thefront end 14. - To increase the operability of the
toy vehicle 10,body extensions 48, such as foot pads, may extend outwardly fromshell 30. Thebody extensions 48 are adapted to provide support for thechassis 12 when thetoy vehicle 10 is on its side such that therear wheel 26 remains in contact with the ground. Accordingly, thetoy 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 therear wheel 26, thetoy vehicle 10 begins to spin in an arcuate path until the vehicle becomes upright and is able to operate on both its front andrear wheels toy vehicle 10 because the operator does not have to walk over to where thetoy vehicle 10 is on its side. Normally, the application of power to therear wheel 26 is all that is required to get thetoy vehicle 10 back into operation. - As shown in
FIG. 2 , thechassis 12 supports numerous internal components, such as apropulsion drive 54 and asteering drive 56, that are enclosed or covered by theshell 30. More specifically, thechassis 12 supports apower supply 58, arear drive motor 60, and asteering servo 62, which are all electrically coupled to acontrol board 64 that is supported on thechassis 12 as well. Thecontrol board 64 may also be electrically coupled to areceiver 66 located in thechassis 12 for receiving radio signals from a remotely-located radio transmitter (not shown). The radio signals may be received by anexternal antenna 67 that is positioned on thechassis 12 and coupled to thereceiver 66. - Still referring to
FIG. 2 , agear drive assembly 68 connects therear drive motor 60 to therear wheel 26. Therear drive motor 60 transmits power through thegear drive assembly 68, which in turn rotates therear wheel 26 to propel thetoy vehicle 10 forward. By enclosing thegear drive assembly 68 and other components within the shell orcasing 30, thetoy vehicle 10 is protected against debris that may clog or damage thepropulsion drive 54 andgear drive assembly 68. In other embodiments, thegear drive assembly 68 may be replaced with a drive belt system, a chain drive, or some other means that drivingly couples thepropulsion drive 54 to therear wheel 26. - As shown in
FIGS. 2 and 3 , thesteering drive 56 is operatively connected to thefront fork 18, which includes substantially parallel first andsecond members 76, 78 (FIGS. 4A and 4B ) spaced about thefront wheel 24. The first andsecond members more fork couplers 80, which in turn are pivotally connected to thefront end 14 of thechassis 12 by apivot pin 82. Thus, thefront fork 18 pivots about anaxis 84. Theaxis 84 may also be referred to as acastering axis 84 for reasons discussed in more detail below. - Now referring more specifically to
FIGS. 2 and 3 , the operation of thesteering drive 56 is shown in greater detail. The steering drive 56 includes thesteering servo 62 and asteering arm 90, which is pivotally connected to thesteering servo 62 atpivot point 92. Alink 94 is connected betweensteering arm 90 andflange 98, which is fixedly coupled to thesecond member 78 of thefront fork 18. In operation, the steeringservo 62 generates steering outputs that move thesteering arm 90, which in turn moves link 94 either backwards or forwards depending on the desired direction for thetoy vehicle 10. Consequently, when link 94 moves, thefront fork 18 pivots about casteringaxis 84 such that thetoy vehicle 10 will turn either left or right relative tolongitudinal axis 102. Alternatively, thelink 94 may be pivotally connected to thefork coupler 80 or directly to a portion of thefront fork 18. - With reference to
FIGS. 4A and 4B , thefront wheel 24 comprises anouter tire 112 that surrounds first and second wheel halves 114, 116. The wheel halves 114, 116 are supported on afront axle 118 and may be held together byscrews 119 that extend throughbores 120 in thefirst wheel half 114 and into threaded bores 122 (FIG. 6 ) in thesecond wheel half 116. Thebores flywheel assembly 28. In other words, theflywheel assembly 28 may be encased between the wheel halves 114, 116 and housed within thefront wheel 24. - As shown in the figures, the
flywheel assembly 28 includes aweighted flywheel 130, aflywheel plate 132, and amotor 134. Theweighted flywheel 130 may be coupled to theflywheel plate 132 byscrews 136 that extend throughbores 138 in theflywheel plate 132 and anchor into corresponding threaded bores 140 (FIG. 6 ) on theflywheel 130. Theflywheel plate 132 is driven by themotor 134, which is positioned within amotor mount 144. Theflywheel plate 132 andflywheel 130 are adapted to rotate within thefront wheel 24 to create a gyroscopic effect. More specifically, theflywheel plate 132 is adapted to rotate about thefront axle 118, which is fixably attached to the first andsecond members 74, 78 offront fork 18. Unlike theflywheel plate 132, themotor mount 144 is operatively connected to the fixedfront axle 118 such that it does not rotate about theaxle 118. For example, ahexagonal portion 145 of thefront axle 118 may cooperate with ahexagonal bore 146 inmotor mount 144 to preventmotor mount 144 from rotating about theaxle 118.Wires 148 electrically couple themotor 134 to thepower supply 58 oftoy vehicle 10. As discussed below, thewires 148 may be routed through hollow cavities in thefront axle 118 andfront fork 18. - In the embodiment shown in
FIGS. 4A and 4B , themotor 134 is drivingly coupled to theflywheel plate 132 by abelt drive system 150. Thebelt drive system 150 includes apulley 152 coupled to theflywheel plate 132 and apulley 154 connected to themotor 134. Abelt 156 connectspulley 152 topulley 154 such that when themotor 134 is energized, theflywheel plate 132 andweighted flywheel 130 spin about thefront axle 118. Although only one type ofbelt drive system 150 is illustrated and described herein, any other similar means may be used in accordance with the present invention to drivingly couple theflywheel plate 132 to themotor 134. For example,FIG. 5 shows an alternate configuration of theflywheel assembly 28. In this configuration, thepulley 152 ofFIGS. 4A and 4B is replaced with agear 162. Similarly, thepulley 154 ofFIGS. 4A and 4B is replaced with agear 164. Thegears belt 156 inFIGS. 4A and 4B is eliminated. In other words, whenmotor 134 is energized,gear 164 drives gear 162 to rotate theflywheel plate 132 andweighted flywheel 130. -
FIG. 6 shows the fully assembledfront wheel 24 andflywheel assembly 28. As shown in the figure, thewires 148 may be advantageously routed throughhollow cavities front fork 18 andfront axle 118, respectively. Such an arrangement prevents thewires 148 from interfering with the rotation of thefront wheel 24 orflywheel 130. Although only thesecond member 78 offront fork 18 is shown as having a hollow cavity, thefirst member 76 may include a hollow cavity as well. In such an embodiment thehollow cavity 170 in thefront axle 118 would extend substantially across the entire length of theaxle 118 to allow wires to be routed through both the first andsecond members motor 134. Alternatively, thewires 148 could be routed on the outside of thefront fork 18 and enter thehollow cavity 170 through the end ofaxle 118. - As shown in
FIG. 7 , the first andsecond members front fork 18 may be adapted to conduct electricity. In other words, first andsecond members motor 134. This arrangement eliminates the need to route wires through hollow cavities in thefront fork 18. Instead, a first set of wires 174 may be used to operatively connect thepower supply 58 to a first end 18 a offront fork 18, and a second set ofwires 176 may be used to operatively connect asecond end 18 b offront fork 18 to themotor 134. The first and second sets ofwires 174, 176 are each comprised of apositive wire 180 and anegative wire 182. - Still referring to
FIG. 7 , the first andsecond members upper shock bodies lower shock shafts front fork 18, the positive andnegative wires metal plates 192 located in theshock bodies plates 192 transfer any current tosprings 194, which in turn transfer current tolower shock shafts power supply 58 to themotor 134 via thenegative wire 182 andsecond member 78, and back to thepower supply 58 via thepositive wire 180 andfirst member 76. In order to couple the first set of wires 174 to thepower supply 58, both the positive andnegative wires front fork 18 may be routed through thepivot pin 82. - To operate the
toy vehicle 10 shown inFIGS. 1 and 2 , the user places aswitch 200 in an “on” position to send power from thepower supply 58 to thecontrol board 64. Thepower supply 58 may be any suitable power source, such as rechargeable batteries. Upon receiving power, thecontrol board 64 may then energize themotor 134 via thewires 148. Because thefront axle 118 is fixedly connected to thefront fork 18 and themotor mount 144 is secured to thefront axle 118, themotor 134 does not rotate about thefront axle 118 when activated. Instead, themotor 134 drivespulley 154, which in turn drivesbelt 156 andpulley 152 in order to rotate theflywheel plate 132 about thefront axle 118. As discussed below, the rotation of theflywheel 130 with theflywheel plate 132 increases the stability of thetoy vehicle 10 by creating a gyroscopic effect when thetoy vehicle 10 is in motion. - The forward movement of the
toy vehicle 10 is controlled by therear 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 therear drive motor 60 is activated, therear wheel 26 propels thetoy vehicle 10 forward and thefront wheel 24 freely rotates about thefront axle 118. Because theflywheel assembly 28 is not coupled to the wheel halves 114, 116 andtire 112, theflywheel 130 andfront wheel 24 rotate independently of each other. The rotational speed of theflywheel 130 is determined by type ofmotor 134, along with the sizes of thebelt 156 andpulleys 152, 154 (or gears 162, 164) being used. These components may be chosen in a manner that enables theflywheel 130 to rotate substantially faster than thefront wheel 24 during normal operation of thetoy vehicle 10. This rotation of theflywheel 130 creates a gyroscopic effect that helps make thetoy vehicle 10 less likely to fall over because of wind or other external forces, including rough terrain. For example, when thetoy 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 casteringaxis 84. As shown inFIGS. 1 and 2 , thetoy vehicle 10 travels on asurface 210 and thecastering axis 84 projects ahead of where thefront wheel 24 contacts thesurface 210. Such an arrangement provides a positive caster with atrail 220, which represents the distance between where thecastering axis 84 intersects thetravel surface 210 and the contact point of thefront wheel 24 with thetravel surface 210. As thetoy vehicle 10 travels forward, the casteringaxis 84 effectively pulls thefront wheel 24 along the toy vehicle's path of motion. Thus, this castering effect or force tends to realign thefront wheel 24 with the toy vehicle's path of motion when thefront wheel 24 deviates therefrom due to rough terrain or the like. - Although the
toy vehicle 10 could function without the assistance of an operator, it is contemplated that an operator will remotely control thetoy vehicle 10 by means of a radio transmitter. For example, to initiate forward motion, the operator sends a propulsion signal which is received byreceiver 66. The propulsion signal is then transmitted to thecontrol board 64, which energizesrear drive motor 60. Accordingly, the forward motion of thetoy vehicle 10 may be controlled by the operator sending an appropriate propulsion signal to thetoy vehicle 10. Similarly, steering signals may also be transmitted by the operator to control the operation of thesteering servo 62. Thus, by using a two-channel transmitter the operator can remotely and independently control both the forward motion and direction of thetoy vehicle 10. - The
motor 134 may be controlled with or without use of the remote radio transmitter. For example, thetoy vehicle 10 may be adapted such that themotor 134 is activated whenever theswitch 200 is placed in the “on” position. In such an embodiment themotor 134 operates independently of the two-channel transmitter and rotates theflywheel 130 about thefront axle 118, even when thetoy vehicle 10 is not in motion. Alternatively, themotor 134 may be operatively connected to thereceiver 66 such that themotor 134 becomes operative when thereceiver 66 receives a propulsion signal. By only activating themotor 134 when the toy vehicle is in motion, the toy vehicle helps prolong the operable life ofpower supply 58 by utilizing less energy over a given period of time. In a further embodiment, thecontrol board 64 may have a timing mechanism adapted to deactivate themotor 134 after a predetermined time period of inactivity by thepropulsion drive 54. Such an arrangement helps prolong the operable life ofpower supply 58 as well. -
FIG. 8 illustrates an alternative embodiment of atoy vehicle 310 having aflywheel 312 configured to rotate within afront wheel 314 to generate a gyroscopic effect. The components of thetoy vehicle 310 other than those housed within thefront wheel 314 may be the same as those discussed above with reference toFIGS. 1-7 . Accordingly, like reference numbers are used inFIG. 8 to refer to like elements from the embodiment shownFIGS. 1-7 . - Rather than including a separate motor for rotating the
flywheel 312, thetoy vehicle 310 includes anengagement mechanism 316 housed within thefront wheel 314 for rotating theflywheel 312. As shown inFIG. 9 , theengagement mechanism 316 generally includes afirst component 318 operatively coupled to thefront wheel 314 and asecond component 320 coupled to theflywheel 312. Thefront wheel 314 includes awheel housing 326, acap 328 secured to thewheel housing 326 byscrews 330, anouter tire 332 surrounding thewheel housing 326, and afront axle 334 fixedly connected to the front fork 18 (FIG. 8 ) and rotatably supporting thewheel housing 326 andcap 328. It will be appreciated, however, that thefront wheel 314 may alternatively comprise first and second wheel halves (not shown) surrounded by theouter tire 332 so as to be constructed in a similar manner as the front wheel 24 (FIG. 4A ). - As shown in
FIG. 9 , thefirst component 318 is a generally circular member having a first semi-circular wing orarcuate portion 338 offset from a second semi-circular wing orarcuate portion 340. Thesecond component 320 is a generally cylindrical boss secured to or integrally formed with theflywheel 312 and defines asocket 342 for receiving thefirst component 318. First andsecond friction elements socket 342 between anouter rim 348 and thefirst component 318. The first andsecond friction elements first component 318 to engage thesecond component 320 to rotate theflywheel 312, as will be described in greater detail below. - The
front wheel 314 further includes agear assembly 354 housed within arecess 356 defined by thewheel cap 328. Thegear assembly 354 is retained in therecess 356 by agear plate 358 secured to thewheel cap 328 byscrews 360. Although a wide variety of configurations are possible, thegear assembly 354 shown inFIG. 9 includes aplanetary gear 362, acentral gear 364, and first, second, and third satellite gears 366, 368, 370. Theplanetary gear 362 is fixedly attached to thefront axle 334 by a set screw (not shown) or the like such that it remains stationary with thefront axle 334 when thefront wheel 314 rotates. The first, second, and third satellite gears 366, 368, 370 are rotatably mounted on respective first, second, andthird axles gear plate 358 via respective first, second, andthird througholes FIG. 2 ) is activated so that thetoy vehicle 310 moves forward and causes thefront wheel 314 to rotate about thefront axle 334, thegear plate 358 causes the satellite gears 366, 368, 370 to rotate as well. In turn, the satellite gears 366, 368, 370 rotate thecentral gear 364, which extends through acentral opening 384 in thegear plate 358 and engages thefirst component 318 of theengagement mechanism 316. - As a result of this arrangement, the
first component 318 is operatively engaged to thefront wheel 314 so as to be driven thereby. Advantageously, the size of theplanetary gear 362,central gear 364, and satellite gears 366, 368, 370 are selected such that one revolution of thefront wheel 314 causes several revolutions of thefirst component 318. For example, thefirst component 318 may rotate between about five to ten times for each rotation of thefront wheel 314. Additionally, thegear plate 358 confronts thesecond component 320 of theengagement mechanism 316 when thefront wheel 314 is assembled to retain thefirst component 318 and first andsecond friction elements socket 342. -
FIGS. 10A through 10C illustrate the operation of theengagement mechanism 316 in further detail. When rotated in afirst direction 388, thefirst component 318 causes thefirst friction element 344 to frictionally engage the firstarcuate portion 338 andouter rim 348 so as to become wedged therebetween. Thesecond friction element 346 likewise frictionally engages the secondarcuate portion 340 and theouter rim 348 so as to become wedged therebetween. This positive engagement enables thefirst component 318 to rotate thesecond component 320 andflywheel 312 in thefirst direction 388. This positive engagement differs from other engagement mechanism where one member may slip along another member before full engagement occurs, such as in a traditional centrifugal clutch. As discussed above, thefirst component 318 advantageously rotates at a faster rate than thefront wheel 314 because of thegear assembly 354. Consequently, theflywheel 312 rotates at a faster rate as well to generate gyroscopic forces that stabilize thetoy vehicle 310. - When the
front wheel 314 andfirst component 318 decelerate in thefirst direction 388, the first andsecond friction elements arcuate portions outer rim 348 of thesecond component 320. This allows thesecond component 320 andflywheel 312 to continue rotating in thefirst direction 388 independently of thefront wheel 314. Indeed, as shown inFIG. 10B , thesecond component 320 andflywheel 312 may even continue to rotate in thefirst direction 388 when thefront wheel 314 is stopped. The configuration of thefirst component 318 ensures that the first andsecond friction elements socket 342 so as to cause minimal interference with the continued rotation of thesecond component 320. In particular, the continued rotation of thesecond component 320 faster than thefirst component 318 urges thefirst friction element 344 toward aplanar surface 390 and thesecond friction element 346 toward aplanar surface 392 anytime the first andsecond friction elements outer rim 348. Theplanar surfaces first component 318 extend toward theouter rim 348 in a direction substantially perpendicular to a tangent (not shown) of theouter rim 348. Thus, the first andsecond friction elements planar surfaces outer rim 348. - The same relationship holds true when the
first component 318 is rotated in asecond direction 394, as shown inFIG. 10C . In this situation, theplanar surfaces second friction elements socket 342 so as to not impede the rotation of thefirst component 318. This occurs whether theflywheel 312 is rotating in thefirst direction 388 or not. To this end, theengagement mechanism 316 acts as a one-way engagement mechanism. - The first and
second friction elements FIGS. 8-10C are spherical balls. It will be appreciated, however, that many other shapes and configurations are possible. For example, the first andsecond friction elements socket 342 by thegear plate 358. Additionally, although first and second friction elements are shown in the figures, it will be appreciated that only a single friction element is required to cause engagement between the first andsecond components second components -
FIGS. 11A and 11B illustrate anengagement mechanism 410 according to an alternative embodiment. In this embodiment, the first component is aratchet wheel 412 having a plurality ofprojections 414 along its outer perimeter and the second component is aratchet tab 416 pivotally connected to theflywheel 412. Theratchet tab 416 positively engages one of theprojections 414 when theratchet wheel 412 is rotated in the first direction 388 (FIG. 11A ). There is no slippage between theratchet tab 416 andprojections 414 during the engagement process. To facilitate this engagement, theratchet tab 416 may be normally biased against theratchet wheel 412. As a result of this arrangement, theratchet wheel 412 rotates theflywheel 312 when driven in thefirst direction 388 by thefront wheel 314. When thefront wheel 314 andratchet wheel 412 decelerate in thefirst direction 388, theflywheel 312 is able to continue rotating in thefirst direction 388 independently of theratchet wheel 412 because theratchet tab 416 is simply deflected by (rather than engaged by) theprojections 414 as it passes over them. As shown inFIG. 11B , theflywheel 312 may continue to rotate in thefirst direction 388 even when thefront wheel 314 is stopped. Theratchet wheel 412 andratchet tab 416 may or may not be positioned in asocket 418 similar to thesocket 342 inFIGS. 8-10C . -
FIGS. 12A and 12B illustrate anengagement mechanism 430 according to yet another embodiment. In this embodiment, the first component is apaw wheel 432 having one ormore arms 434 extending therefrom and the second component is acylindrical boss 436 coupled to theflywheel 312. Thecylindrical boss 436 defines asocket 438 for receiving thepaw wheel 432 and includes a plurality ofnotches 440 shaped to cooperate with thearms 434 of thepaw wheel 432. In particular, when thepaw wheel 432 is rotated in the first direction 388 (FIG. 12A ), eacharm 434 positively engages anengagement surface 442 on one of thenotches 440 so that thecylindrical boss 436 andflywheel 312 are rotated in thefirst direction 388 as well. There is no slippage between theratchet tab 416 andprojections 414 during the engagement process. When thepaw wheel 432 decelerates in the first direction 388 (FIG. 12B ), thenotches 440 release from engagement with thearms 434 to allow thecylindrical boss 436 andflywheel 312 to continue to rotate in thefirst direction 388 independently of thefront wheel 314 andpaw wheel 432. Thenotches 440 may include guide surfaces 444 that contact thearms 434 during this relative rotation, but the guide surfaces 444 simply cause thearms 434 to flex inwardly so as to cause minimal interference with the relative rotation. To this end, thearms 434 may be resilient. - The design of the embodiments of
FIGS. 8-12B assists the toy vehicle right itself, i.e, standup, from a tipped over position without user intervention, especially in the situation when the flywheel is stopped or slowly spinning. As the toy vehicle attempts to move forward from a dead stop, the front wheel and the stopped or nearly stopped flywheel resists being rotated. As the flywheel resists rotating, the front wheel is able to overcome the caster affect and turn sharper than it normally would. Consequently, the bike will turn in a tighter radius and create enough centrifugal force in the toy vehicle to cause the toy vehicle to lift off its side and onto two wheels quicker than without the resistance of the flywheel. - 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 (18)
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.
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US11/736,349 US20070207699A1 (en) | 2004-07-09 | 2007-04-17 | Toy vehicle with stabilized front wheel |
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US58656104P | 2004-07-09 | 2004-07-09 | |
US11/085,341 US20060009119A1 (en) | 2004-07-09 | 2005-03-21 | Toy vehicle with stabilized front wheel |
US11/736,349 US20070207699A1 (en) | 2004-07-09 | 2007-04-17 | Toy vehicle with stabilized front wheel |
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US11/085,341 Continuation-In-Part US20060009119A1 (en) | 2004-07-09 | 2005-03-21 | Toy vehicle with stabilized front wheel |
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US20070207699A1 true US20070207699A1 (en) | 2007-09-06 |
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US11/736,349 Abandoned US20070207699A1 (en) | 2004-07-09 | 2007-04-17 | Toy vehicle with stabilized front wheel |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US20100093256A1 (en) * | 2008-10-10 | 2010-04-15 | Jakks Pacific, Inc. | Mobile toy with displaceable flywheel |
US20100279583A1 (en) * | 2008-10-10 | 2010-11-04 | Dominic Laurienzo | Track set with a tiltable surface for use with a toy vehicle |
US20100285719A1 (en) * | 2008-10-10 | 2010-11-11 | Dominic Laurienzo | Track set with taut filament for use with a toy vehicle |
US20100330876A1 (en) * | 2008-10-10 | 2010-12-30 | Jakks Pacific, Inc. | Mobile skateboard-shaped toy with a flywheel |
US20100330873A1 (en) * | 2008-10-10 | 2010-12-30 | Mccafferty Jim | Toy vehicle launcher |
US20110003532A1 (en) * | 2008-10-10 | 2011-01-06 | Mccafferty Jim | Stunt figure for attaching with a mobile toy to allow for performance of a stunt |
WO2012168771A2 (en) * | 2011-04-25 | 2012-12-13 | Jimenez Acevedo Guillermo | Mechanical device for stabilising two-wheeled vehicles, to be installed in the front wheel |
JP2013212232A (en) * | 2012-04-01 | 2013-10-17 | Tamaden Kogyo Kk | Unmanned two-wheeler with attitude control |
CN105252960A (en) * | 2015-10-26 | 2016-01-20 | 嘉兴哈雷童车有限公司 | Suspension type hidden front wheel of tricycle |
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US8079891B2 (en) | 2008-10-10 | 2011-12-20 | Jakks Pacific, Inc. | Track set with taut filament for use with a toy vehicle |
US8562386B2 (en) | 2008-10-10 | 2013-10-22 | Jakks Pacific, Inc. | Mobile skateboard-shaped toy with a flywheel |
US20100285719A1 (en) * | 2008-10-10 | 2010-11-11 | Dominic Laurienzo | Track set with taut filament for use with a toy vehicle |
US20100330876A1 (en) * | 2008-10-10 | 2010-12-30 | Jakks Pacific, Inc. | Mobile skateboard-shaped toy with a flywheel |
US20100330873A1 (en) * | 2008-10-10 | 2010-12-30 | Mccafferty Jim | Toy vehicle launcher |
US20110003532A1 (en) * | 2008-10-10 | 2011-01-06 | Mccafferty Jim | Stunt figure for attaching with a mobile toy to allow for performance of a stunt |
US20100279583A1 (en) * | 2008-10-10 | 2010-11-04 | Dominic Laurienzo | Track set with a tiltable surface for use with a toy vehicle |
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WO2012168771A2 (en) * | 2011-04-25 | 2012-12-13 | Jimenez Acevedo Guillermo | Mechanical device for stabilising two-wheeled vehicles, to be installed in the front wheel |
JP2013212232A (en) * | 2012-04-01 | 2013-10-17 | Tamaden Kogyo Kk | Unmanned two-wheeler with attitude control |
CN105252960A (en) * | 2015-10-26 | 2016-01-20 | 嘉兴哈雷童车有限公司 | Suspension type hidden front wheel of tricycle |
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